diff --git a/Makefile.dji b/Makefile.dji index cc56aa2..bed87d4 100644 --- a/Makefile.dji +++ b/Makefile.dji @@ -23,7 +23,7 @@ all: jni/* install: all install -d ipk/goggle/build/data/opt/fonts/ - install fonts/*.bin ipk/goggle/build/data/opt/fonts/ + install fonts/*.png ipk/goggle/build/data/opt/fonts/ install -d ipk/goggle/build/data/opt/mspdictionaries/ install dictionaries/*.bin ipk/goggle/build/data/opt/mspdictionaries/ install -d ipk/goggle/build/data/opt/etc/preload.d/ diff --git a/fonts/font.bin b/fonts/font.bin deleted file mode 100644 index 7c50189..0000000 Binary files a/fonts/font.bin and /dev/null differ diff --git a/fonts/font.png b/fonts/font.png new file mode 100644 index 0000000..8f6ac60 Binary files /dev/null and b/fonts/font.png differ diff --git a/fonts/font_2.bin b/fonts/font_2.bin deleted file mode 100644 index b671899..0000000 Binary files a/fonts/font_2.bin and /dev/null differ diff --git a/fonts/font_ardu.bin b/fonts/font_ardu.bin deleted file mode 100644 index f8f8d03..0000000 Binary files a/fonts/font_ardu.bin and /dev/null differ diff --git a/fonts/font_ardu.png b/fonts/font_ardu.png new file mode 100644 index 0000000..5a5cd0b Binary files /dev/null and b/fonts/font_ardu.png differ diff --git a/fonts/font_ardu_2.bin b/fonts/font_ardu_2.bin deleted file mode 100644 index 3c5aa3a..0000000 Binary files a/fonts/font_ardu_2.bin and /dev/null differ diff --git a/fonts/font_ardu_hd.bin b/fonts/font_ardu_hd.bin deleted file mode 100644 index dc295a8..0000000 Binary files a/fonts/font_ardu_hd.bin and /dev/null differ diff --git a/fonts/font_ardu_hd.png b/fonts/font_ardu_hd.png new file mode 100644 index 0000000..eabe583 Binary files /dev/null and b/fonts/font_ardu_hd.png differ diff --git a/fonts/font_ardu_hd_2.bin b/fonts/font_ardu_hd_2.bin deleted file mode 100644 index 2bd63bc..0000000 Binary files a/fonts/font_ardu_hd_2.bin and /dev/null differ diff --git a/fonts/font_bf_hd.bin b/fonts/font_bf_hd.bin deleted file mode 100644 index 28e62bd..0000000 Binary files a/fonts/font_bf_hd.bin and /dev/null differ diff --git a/fonts/font_bf_hd.png b/fonts/font_bf_hd.png new file mode 100644 index 0000000..2b1316e Binary files /dev/null and b/fonts/font_bf_hd.png differ diff --git a/fonts/font_bf_hd_2.bin b/fonts/font_bf_hd_2.bin deleted file mode 100644 index 77b85ac..0000000 Binary files a/fonts/font_bf_hd_2.bin and /dev/null differ diff --git a/fonts/font_hd.bin b/fonts/font_hd.bin deleted file mode 100644 index 58747c2..0000000 Binary files a/fonts/font_hd.bin and /dev/null differ diff --git a/fonts/font_hd.png b/fonts/font_hd.png new file mode 100644 index 0000000..59ea11a Binary files /dev/null and b/fonts/font_hd.png differ diff --git a/fonts/font_hd_2.bin b/fonts/font_hd_2.bin deleted file mode 100644 index 77b85ac..0000000 Binary files a/fonts/font_hd_2.bin and /dev/null differ diff --git a/fonts/font_inav.bin b/fonts/font_inav.bin deleted file mode 100644 index a7f3e01..0000000 Binary files a/fonts/font_inav.bin and /dev/null differ diff --git a/fonts/font_inav.png b/fonts/font_inav.png new file mode 100644 index 0000000..93ab13e Binary files /dev/null and b/fonts/font_inav.png differ diff --git a/fonts/font_inav_2.bin b/fonts/font_inav_2.bin deleted file mode 100644 index 0908e41..0000000 Binary files a/fonts/font_inav_2.bin and /dev/null differ diff --git a/fonts/font_inav_hd.bin b/fonts/font_inav_hd.bin deleted file mode 100644 index 788ee1a..0000000 Binary files a/fonts/font_inav_hd.bin and /dev/null differ diff --git a/fonts/font_inav_hd.png b/fonts/font_inav_hd.png new file mode 100644 index 0000000..f7e3988 Binary files /dev/null and b/fonts/font_inav_hd.png differ diff --git a/fonts/font_inav_hd_2.bin b/fonts/font_inav_hd_2.bin deleted file mode 100644 index 333c8fc..0000000 Binary files a/fonts/font_inav_hd_2.bin and /dev/null differ diff --git a/fonts/font_ultra.bin b/fonts/font_ultra.bin deleted file mode 100644 index ad9ff63..0000000 Binary files a/fonts/font_ultra.bin and /dev/null differ diff --git a/fonts/font_ultra.png b/fonts/font_ultra.png new file mode 100644 index 0000000..7364263 Binary files /dev/null and b/fonts/font_ultra.png differ diff --git a/fonts/font_ultra_2.bin b/fonts/font_ultra_2.bin deleted file mode 100644 index b671899..0000000 Binary files a/fonts/font_ultra_2.bin and /dev/null differ diff --git a/fonts/font_ultra_hd.bin b/fonts/font_ultra_hd.bin deleted file mode 100644 index 6c28838..0000000 Binary files a/fonts/font_ultra_hd.bin and /dev/null differ diff --git a/fonts/font_ultra_hd.png b/fonts/font_ultra_hd.png new file mode 100644 index 0000000..34706d4 Binary files /dev/null and b/fonts/font_ultra_hd.png differ diff --git a/fonts/font_ultra_hd_2.bin b/fonts/font_ultra_hd_2.bin deleted file mode 100644 index 77b85ac..0000000 Binary files a/fonts/font_ultra_hd_2.bin and /dev/null differ diff --git a/jni/Android.mk b/jni/Android.mk index 9c80a81..a96bb86 100644 --- a/jni/Android.mk +++ b/jni/Android.mk @@ -9,13 +9,14 @@ include $(CLEAR_VARS) LOCAL_CFLAGS += -fPIC -std=c99 -O3 LOCAL_LDFLAGS += -fPIC -LOCAL_LDLIBS := -llog +LOCAL_LDLIBS := -llog -lz LOCAL_ARM_NEON := true LOCAL_MODULE := displayport_osd_shim LOCAL_SHARED_LIBRARIES := duml_hal LOCAL_SRC_FILES := \ displayport_osd_shim.c \ fakehd/fakehd.c \ + font/font.c \ hw/dji_display.c \ hw/dji_radio_shm.c \ hw/dji_services.c \ @@ -29,7 +30,8 @@ LOCAL_SRC_FILES := \ rec/rec.c \ util/fs_util.c \ toast/toast.c \ - lz4/lz4.c + lz4/lz4.c \ + libspng/spng.c include $(BUILD_SHARED_LIBRARY) include $(CLEAR_VARS) diff --git a/jni/font/font.c b/jni/font/font.c new file mode 100644 index 0000000..4d380a0 --- /dev/null +++ b/jni/font/font.c @@ -0,0 +1,284 @@ +#include +#include +#include +#include +#include +#include + +#include "../libspng/spng.h" +#include "font.h" + +#define BYTES_PER_PIXEL 4 +#define HD_FONT_WIDTH 24 + +#ifdef DEBUG +#define DEBUG_PRINT(fmt, args...) fprintf(stderr, fmt, ## args) +#else +#define DEBUG_PRINT(fmt, args...) +#endif + +/* Font helper methods */ + +font_variant_e font_variant_from_string(char *variant_string) { + font_variant_e font_variant = FONT_VARIANT_GENERIC; + if(strncmp(variant_string, "ARDU", 4) == 0) { + font_variant = FONT_VARIANT_ARDUPILOT; + } else if (strncmp(variant_string, "BTFL", 4) == 0) { + font_variant = FONT_VARIANT_BETAFLIGHT; + } else if (strncmp(variant_string, "INAV", 4) == 0) { + font_variant = FONT_VARIANT_INAV; + } else if (strncmp(variant_string, "ULTR", 4) == 0) { + font_variant = FONT_VARIANT_KISS_ULTRA; + } + return font_variant; +} + +void get_font_path_with_extension(char *font_path_dest, const char *font_path, const char *extension, uint8_t len, uint8_t is_hd, font_variant_e font_variant) +{ + char name_buf[len]; + char res_buf[len]; + + switch (font_variant) + { + case FONT_VARIANT_BETAFLIGHT: + snprintf(name_buf, len, "%s_bf", font_path); + break; + case FONT_VARIANT_INAV: + snprintf(name_buf, len, "%s_inav", font_path); + break; + case FONT_VARIANT_ARDUPILOT: + snprintf(name_buf, len, "%s_ardu", font_path); + break; + case FONT_VARIANT_KISS_ULTRA: + snprintf(name_buf, len, "%s_ultra", font_path); + break; + default: + snprintf(name_buf, len, "%s", font_path); + } + + if (is_hd) + { + // surely there's a better way... + snprintf(res_buf, len, "%s", "_hd"); + } else { + snprintf(res_buf, len, "%s", ""); + } + snprintf(font_path_dest, len, "%s%s%s", name_buf, res_buf, extension); +} + +static int open_font(const char *filename, display_info_t *display_info, font_variant_e font_variant) +{ + char file_path[255]; + int is_hd = (display_info->char_width == HD_FONT_WIDTH) ? 1 : 0; + get_font_path_with_extension(file_path, filename, ".png", 255, is_hd, font_variant); + DEBUG_PRINT("Opening font: %s\n", file_path); + struct stat st; + memset(&st, 0, sizeof(st)); + stat(file_path, &st); + size_t filesize = st.st_size; + if(!(filesize > 0)) { + DEBUG_PRINT("Font file did not exist: %s\n", file_path); + return -1; + } + + FILE *fd = fopen(file_path, "rb"); + if (!fd) { + DEBUG_PRINT("Could not open file %s\n", file_path); + return -1; + } + + spng_ctx *ctx = spng_ctx_new(0); + DEBUG_PRINT("Allocated PNG context\n"); + // Set some kind of reasonable PNG limit so we don't get blown up + size_t limit = 1024 * 1024 * 64; + spng_set_chunk_limits(ctx, limit, limit); + DEBUG_PRINT("Set PNG chunk limits\n"); + spng_set_png_file(ctx, fd); + DEBUG_PRINT("Set PNG file\n"); + + struct spng_ihdr ihdr; + int ret = spng_get_ihdr(ctx, &ihdr); + DEBUG_PRINT("Got PNG header\n"); + + if(ret) + { + printf("spng_get_ihdr() error: %s\n", spng_strerror(ret)); + goto err; + } + + if(ihdr.height != display_info->font_height * NUM_CHARS) { + printf("font invalid height, got %d wanted %d\n", ihdr.height, display_info->font_height * NUM_CHARS); + goto err; + } + + if(ihdr.width % display_info->font_width != 0) { + printf("font invalid width, not a multiple of %d\n", display_info->font_width); + goto err; + } + + DEBUG_PRINT("Image pixel size %d x %d\n", ihdr.width, ihdr.height); + + int num_pages = ihdr.width / display_info->font_width; + + DEBUG_PRINT("Font has %d pages\n", num_pages); + + size_t image_size = 0; + int fmt = SPNG_FMT_RGBA8; + ret = spng_decoded_image_size(ctx, fmt, &image_size); + if(ret) { + goto err; + } + + DEBUG_PRINT("Allocating image size %d\n", image_size); + + void* font_data = malloc(image_size); + ret = spng_decode_image(ctx, font_data, image_size, SPNG_FMT_RGBA8, 0); + if(ret) { + printf("Failed to decode PNG!\n"); + free(font_data); + goto err; + } + + for(int page = 0; page < num_pages; page++) { + DEBUG_PRINT("Loading font page %d of %d, placing %x\n", page, num_pages, display_info->fonts); + display_info->fonts[page] = malloc(display_info->font_width * display_info->font_height * NUM_CHARS * BYTES_PER_PIXEL); + DEBUG_PRINT("Allocated %d bytes for font page buf at%x\n", display_info->font_width * display_info->font_height * NUM_CHARS * BYTES_PER_PIXEL, display_info->fonts[page]); + for(int char_num = 0; char_num < NUM_CHARS; char_num++) { + for(int y = 0; y < display_info->font_height; y++) { + // Copy each character line at a time into the correct font buffer + int char_width_bytes = display_info->font_width * BYTES_PER_PIXEL; + int char_size_bytes_dest = (display_info->font_width * display_info->font_height * BYTES_PER_PIXEL); + int char_size_bytes_src = (ihdr.width * display_info->font_height * BYTES_PER_PIXEL); + memcpy((uint8_t *)display_info->fonts[page] + (char_num * char_size_bytes_dest) + (y * char_width_bytes), (uint8_t *)font_data + (char_num * char_size_bytes_src) + (ihdr.width * y * BYTES_PER_PIXEL) + (page * char_width_bytes), char_width_bytes); + } + } + } + + free(font_data); + spng_ctx_free(ctx); + fclose(fd); + return 0; + err: + spng_ctx_free(ctx); + fclose(fd); + return -1; +} + +void load_font(display_info_t *display_info, font_variant_e font_variant) { + // Note: load_font will not replace an existing font. + if(display_info->fonts[0] == NULL) { + if (open_font(SDCARD_FONT_PATH, display_info, font_variant) < 0) { + if (open_font(ENTWARE_FONT_PATH, display_info, font_variant) < 0) { + open_font(FALLBACK_FONT_PATH, display_info, font_variant); + } + } + } +} + +void close_font(display_info_t *display_info) { + for(int i = 0; i < NUM_FONT_PAGES; i++) { + if(display_info->fonts[i] != NULL) { + free(display_info->fonts[i]); + display_info->fonts[i] = NULL; + } + } +} + +void convert_bin_fonts(const char *file_location) +{ + display_info_t sd_display_info = { + .char_width = 30, + .char_height = 15, + .font_width = 36, + .font_height = 54, + .x_offset = 180, + .y_offset = 0, + .fonts = {NULL, NULL, NULL, NULL}, + }; + + static display_info_t hd_display_info = { + .char_width = 50, + .char_height = 18, + .font_width = 24, + .font_height = 36, + .x_offset = 120, + .y_offset = 80, + .fonts = {NULL, NULL, NULL, NULL}, + }; + + for(int is_hd = 0; is_hd < 2; is_hd++) { + for(int i = 0; i < FONT_VARIANT_COUNT; i++) { + int page_count = 1; + char file_path[255]; + get_font_path_with_extension(file_path, file_location, ".bin", 255, is_hd, i); + char page_2_file_path[255]; + get_font_path_with_extension(page_2_file_path, file_location, "_2.bin", 255, is_hd, i); + char *file_paths[2] = {file_path, page_2_file_path}; + struct stat st; + memset(&st, 0, sizeof(st)); + stat(file_path, &st); + size_t page_1_filesize = st.st_size; + stat(page_2_file_path, &st); + size_t page_2_filesize = st.st_size; + display_info_t display_info = is_hd ? hd_display_info : sd_display_info; + size_t desired_filesize = display_info.font_height * display_info.font_width * NUM_CHARS * BYTES_PER_PIXEL; + DEBUG_PRINT("Found a font candidate to convert: %s %d\n", file_path, page_1_filesize); + if(page_1_filesize == desired_filesize) { + DEBUG_PRINT("Found a font to convert: %s %d\n", file_path, desired_filesize); + } else { + continue; + } + if(page_2_filesize == desired_filesize) { + page_count = 2; + } + void *image_buf = malloc(desired_filesize * page_count); + for(int page = 0; page < page_count; page++) { + int fd = open(file_paths[page], O_RDONLY, 0); + if (!fd) { + DEBUG_PRINT("Could not open file %s\n", file_path); + continue; + } + void* mmappedData = mmap(NULL, desired_filesize, PROT_READ, MAP_PRIVATE, fd, 0); + if (mmappedData != MAP_FAILED) { + for(int char_num = 0; char_num < NUM_CHARS; char_num++) { + for(int y = 0; y < display_info.font_height; y++) { + // Copy each character line at a time into the correct font buffer + int char_width_bytes = display_info.font_width * BYTES_PER_PIXEL; + int char_size_bytes_src = (display_info.font_width * display_info.font_height * BYTES_PER_PIXEL); + int char_size_bytes_dest = (display_info.font_width * page_count * display_info.font_height * BYTES_PER_PIXEL); + memcpy((uint8_t *)image_buf + (char_num * char_size_bytes_dest) + (display_info.font_width * page_count * y * BYTES_PER_PIXEL) + (page * char_width_bytes), (uint8_t *)mmappedData + (char_num * char_size_bytes_src) + (y * char_width_bytes), char_width_bytes); + } + } + } else { + DEBUG_PRINT("Could not map font %s\n", file_path); + free(image_buf); + continue; + } + close(fd); + munmap(mmappedData, desired_filesize); + } + char out_file_path[255]; + get_font_path_with_extension(out_file_path, file_location, ".png", 255, is_hd, i); + FILE* out_fd = fopen(out_file_path, "wb"); + if(out_fd == NULL) { + DEBUG_PRINT("Could not open output %s\n", out_file_path); + continue; + } + spng_ctx *enc = spng_ctx_new(SPNG_CTX_ENCODER); + struct spng_ihdr ihdr = + { + .width = display_info.font_width * page_count, + .height = display_info.font_height * NUM_CHARS, + .bit_depth = 8, + .color_type = SPNG_COLOR_TYPE_TRUECOLOR_ALPHA + }; + spng_set_ihdr(enc, &ihdr); + spng_set_png_file(enc, out_fd); + spng_encode_image(enc, image_buf, desired_filesize * page_count, SPNG_FMT_PNG, SPNG_ENCODE_FINALIZE); + spng_ctx_free(enc); + free(image_buf); + fclose(out_fd); + } + } +} + diff --git a/jni/font/font.h b/jni/font/font.h new file mode 100644 index 0000000..27fd7c9 --- /dev/null +++ b/jni/font/font.h @@ -0,0 +1,22 @@ +#include + +#include "../util/display_info.h" + +#define FALLBACK_FONT_PATH "/blackbox/font" +#define ENTWARE_FONT_PATH "/opt/fonts/font" +#define SDCARD_FONT_PATH "/storage/sdcard0/font" + +typedef enum { + FONT_VARIANT_GENERIC, + FONT_VARIANT_BETAFLIGHT, + FONT_VARIANT_INAV, + FONT_VARIANT_ARDUPILOT, + FONT_VARIANT_KISS_ULTRA, + FONT_VARIANT_COUNT +} font_variant_e; + +void convert_bin_fonts(const char *file_location); +void load_font(display_info_t *display_info, font_variant_e font_variant); +void close_font(display_info_t *display_info); +void get_font_path_with_extension(char *font_path_dest, const char *font_path, const char *extension, uint8_t len, uint8_t is_hd, font_variant_e font_variant); +font_variant_e font_variant_from_string(char *variant_string); diff --git a/jni/libspng/spng.c b/jni/libspng/spng.c new file mode 100644 index 0000000..f88492b --- /dev/null +++ b/jni/libspng/spng.c @@ -0,0 +1,6979 @@ +/* SPDX-License-Identifier: (BSD-2-Clause AND libpng-2.0) */ + +#define SPNG__BUILD + +#include "spng.h" + +#include +#include +#include +#include + +#define ZLIB_CONST + +#ifdef __FRAMAC__ + #define SPNG_DISABLE_OPT + #include "tests/framac_stubs.h" +#else + #ifdef SPNG_USE_MINIZ + #include + #else + #include + #endif +#endif + +#ifdef SPNG_MULTITHREADING + #include +#endif + +/* Not build options, edit at your own risk! */ +#define SPNG_READ_SIZE (8192) +#define SPNG_WRITE_SIZE SPNG_READ_SIZE +#define SPNG_MAX_CHUNK_COUNT (1000) + +#define SPNG_TARGET_CLONES(x) + +#ifndef SPNG_DISABLE_OPT + + #if defined(__i386__) || defined(__x86_64__) || defined(_M_IX86) || defined(_M_X64) + #define SPNG_X86 + + #if defined(__x86_64__) || defined(_M_X64) + #define SPNG_X86_64 + #endif + + #elif defined(__aarch64__) || defined(_M_ARM64) /* || defined(__ARM_NEON) */ + #define SPNG_ARM /* NOTE: only arm64 builds are tested! */ + #else + #pragma message "disabling SIMD optimizations for unknown target" + #define SPNG_DISABLE_OPT + #endif + + #if defined(SPNG_X86_64) && defined(SPNG_ENABLE_TARGET_CLONES) + #undef SPNG_TARGET_CLONES + #define SPNG_TARGET_CLONES(x) __attribute__((target_clones(x))) + #else + #define SPNG_TARGET_CLONES(x) + #endif + + #ifndef SPNG_DISABLE_OPT + static void defilter_sub3(size_t rowbytes, unsigned char *row); + static void defilter_sub4(size_t rowbytes, unsigned char *row); + static void defilter_avg3(size_t rowbytes, unsigned char *row, const unsigned char *prev); + static void defilter_avg4(size_t rowbytes, unsigned char *row, const unsigned char *prev); + static void defilter_paeth3(size_t rowbytes, unsigned char *row, const unsigned char *prev); + static void defilter_paeth4(size_t rowbytes, unsigned char *row, const unsigned char *prev); + + #if defined(SPNG_ARM) + static uint32_t expand_palette_rgba8_neon(unsigned char *row, const unsigned char *scanline, const unsigned char *plte, uint32_t width); + static uint32_t expand_palette_rgb8_neon(unsigned char *row, const unsigned char *scanline, const unsigned char *plte, uint32_t width); + #endif + #endif +#endif + +#if defined(_MSC_VER) + #pragma warning(push) + #pragma warning(disable: 4244) +#endif + +#if (defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__) || defined(__BIG_ENDIAN__) + #define SPNG_BIG_ENDIAN +#else + #define SPNG_LITTLE_ENDIAN +#endif + +enum spng_state +{ + SPNG_STATE_INVALID = 0, + SPNG_STATE_INIT = 1, /* No PNG buffer/stream is set */ + SPNG_STATE_INPUT, /* Decoder input PNG was set */ + SPNG_STATE_OUTPUT = SPNG_STATE_INPUT, /* Encoder output was set */ + SPNG_STATE_IHDR, /* IHDR was read/written */ + SPNG_STATE_FIRST_IDAT, /* Encoded up to / reached first IDAT */ + SPNG_STATE_DECODE_INIT, /* Decoder is ready for progressive reads */ + SPNG_STATE_ENCODE_INIT = SPNG_STATE_DECODE_INIT, + SPNG_STATE_EOI, /* Reached the last scanline/row */ + SPNG_STATE_LAST_IDAT, /* Reached last IDAT, set at end of decode_image() */ + SPNG_STATE_AFTER_IDAT, /* */ + SPNG_STATE_IEND, /* Reached IEND */ +}; + +enum spng__internal +{ + SPNG__IO_SIGNAL = 1 << 9, + SPNG__CTX_FLAGS_ALL = (SPNG_CTX_IGNORE_ADLER32 | SPNG_CTX_ENCODER) +}; + +#define SPNG_STR(x) _SPNG_STR(x) +#define _SPNG_STR(x) #x + +#define SPNG_VERSION_STRING SPNG_STR(SPNG_VERSION_MAJOR) "." \ + SPNG_STR(SPNG_VERSION_MINOR) "." \ + SPNG_STR(SPNG_VERSION_PATCH) + +#define SPNG_GET_CHUNK_BOILERPLATE(chunk) \ + if(ctx == NULL) return 1; \ + int ret = read_chunks(ctx, 0); \ + if(ret) return ret; \ + if(!ctx->stored.chunk) return SPNG_ECHUNKAVAIL; \ + if(chunk == NULL) return 1 + +#define SPNG_SET_CHUNK_BOILERPLATE(chunk) \ + if(ctx == NULL || chunk == NULL) return 1; \ + if(ctx->data == NULL && !ctx->encode_only) return SPNG_ENOSRC; \ + int ret = read_chunks(ctx, 0); \ + if(ret) return ret + +/* Determine if the spng_option can be overriden/optimized */ +#define spng__optimize(option) (ctx->optimize_option & (1 << option)) + +struct spng_subimage +{ + uint32_t width; + uint32_t height; + size_t out_width; /* byte width based on output format */ + size_t scanline_width; +}; + +struct spng_text2 +{ + int type; + char *keyword; + char *text; + + size_t text_length; + + uint8_t compression_flag; /* iTXt only */ + char *language_tag; /* iTXt only */ + char *translated_keyword; /* iTXt only */ + + size_t cache_usage; + char user_keyword_storage[80]; +}; + +struct decode_flags +{ + unsigned apply_trns: 1; + unsigned apply_gamma: 1; + unsigned use_sbit: 1; + unsigned indexed: 1; + unsigned do_scaling: 1; + unsigned interlaced: 1; + unsigned same_layout: 1; + unsigned zerocopy: 1; + unsigned unpack: 1; +}; + +struct encode_flags +{ + unsigned interlace: 1; + unsigned same_layout: 1; + unsigned to_bigendian: 1; + unsigned progressive: 1; + unsigned finalize: 1; + + enum spng_filter_choice filter_choice; +}; + +struct spng_chunk_bitfield +{ + unsigned ihdr: 1; + unsigned plte: 1; + unsigned chrm: 1; + unsigned iccp: 1; + unsigned gama: 1; + unsigned sbit: 1; + unsigned srgb: 1; + unsigned text: 1; + unsigned bkgd: 1; + unsigned hist: 1; + unsigned trns: 1; + unsigned phys: 1; + unsigned splt: 1; + unsigned time: 1; + unsigned offs: 1; + unsigned exif: 1; + unsigned unknown: 1; +}; + +/* Packed sample iterator */ +struct spng__iter +{ + const uint8_t mask; + unsigned shift_amount; + const unsigned initial_shift, bit_depth; + const unsigned char *samples; +}; + +union spng__decode_plte +{ + struct spng_plte_entry rgba[256]; + unsigned char rgb[256 * 3]; + unsigned char raw[256 * 4]; + uint32_t align_this; +}; + +struct spng__zlib_options +{ + int compression_level; + int window_bits; + int mem_level; + int strategy; + int data_type; +}; + +typedef void spng__undo(spng_ctx *ctx); + +struct spng_ctx +{ + size_t data_size; + size_t bytes_read; + size_t stream_buf_size; + unsigned char *stream_buf; + const unsigned char *data; + + /* User-defined pointers for streaming */ + spng_read_fn *read_fn; + spng_write_fn *write_fn; + void *stream_user_ptr; + + /* Used for buffer reads */ + const unsigned char *png_base; + size_t bytes_left; + size_t last_read_size; + + /* Used for encoding */ + int user_owns_out_png; + unsigned char *out_png; + unsigned char *write_ptr; + size_t out_png_size; + size_t bytes_encoded; + + /* These are updated by read/write_header()/read_chunk_bytes() */ + struct spng_chunk current_chunk; + uint32_t cur_chunk_bytes_left; + uint32_t cur_actual_crc; + + struct spng_alloc alloc; + + enum spng_ctx_flags flags; + enum spng_format fmt; + + enum spng_state state; + + unsigned streaming: 1; + unsigned internal_buffer: 1; /* encoding to internal buffer */ + + unsigned inflate: 1; + unsigned deflate: 1; + unsigned encode_only: 1; + unsigned strict: 1; + unsigned discard: 1; + unsigned skip_crc: 1; + unsigned keep_unknown: 1; + unsigned prev_was_idat: 1; + + struct spng__zlib_options image_options; + struct spng__zlib_options text_options; + + spng__undo *undo; + + /* input file contains this chunk */ + struct spng_chunk_bitfield file; + + /* chunk was stored with spng_set_*() */ + struct spng_chunk_bitfield user; + + /* chunk was stored by reading or with spng_set_*() */ + struct spng_chunk_bitfield stored; + + /* used to reset the above in case of an error */ + struct spng_chunk_bitfield prev_stored; + + struct spng_chunk first_idat, last_idat; + + uint32_t max_width, max_height; + + size_t max_chunk_size; + size_t chunk_cache_limit; + size_t chunk_cache_usage; + uint32_t chunk_count_limit; + uint32_t chunk_count_total; + + int crc_action_critical; + int crc_action_ancillary; + + uint32_t optimize_option; + + struct spng_ihdr ihdr; + + struct spng_plte plte; + + struct spng_chrm_int chrm_int; + struct spng_iccp iccp; + + uint32_t gama; + + struct spng_sbit sbit; + + uint8_t srgb_rendering_intent; + + uint32_t n_text; + struct spng_text2 *text_list; + + struct spng_bkgd bkgd; + struct spng_hist hist; + struct spng_trns trns; + struct spng_phys phys; + + uint32_t n_splt; + struct spng_splt *splt_list; + + struct spng_time time; + struct spng_offs offs; + struct spng_exif exif; + + uint32_t n_chunks; + struct spng_unknown_chunk *chunk_list; + + struct spng_subimage subimage[7]; + + z_stream zstream; + unsigned char *scanline_buf, *prev_scanline_buf, *row_buf, *filtered_scanline_buf; + unsigned char *scanline, *prev_scanline, *row, *filtered_scanline; + + /* based on fmt */ + size_t image_size; /* may be zero */ + size_t image_width; + + unsigned bytes_per_pixel; /* derived from ihdr */ + unsigned pixel_size; /* derived from spng_format+ihdr */ + int widest_pass; + int last_pass; /* last non-empty pass */ + + uint16_t *gamma_lut; /* points to either _lut8 or _lut16 */ + uint16_t *gamma_lut16; + uint16_t gamma_lut8[256]; + unsigned char trns_px[8]; + union spng__decode_plte decode_plte; + struct spng_sbit decode_sb; + struct decode_flags decode_flags; + struct spng_row_info row_info; + + struct encode_flags encode_flags; +}; + +static const uint32_t spng_u32max = INT32_MAX; + +static const uint32_t adam7_x_start[7] = { 0, 4, 0, 2, 0, 1, 0 }; +static const uint32_t adam7_y_start[7] = { 0, 0, 4, 0, 2, 0, 1 }; +static const uint32_t adam7_x_delta[7] = { 8, 8, 4, 4, 2, 2, 1 }; +static const uint32_t adam7_y_delta[7] = { 8, 8, 8, 4, 4, 2, 2 }; + +static const uint8_t spng_signature[8] = { 137, 80, 78, 71, 13, 10, 26, 10 }; + +static const uint8_t type_ihdr[4] = { 73, 72, 68, 82 }; +static const uint8_t type_plte[4] = { 80, 76, 84, 69 }; +static const uint8_t type_idat[4] = { 73, 68, 65, 84 }; +static const uint8_t type_iend[4] = { 73, 69, 78, 68 }; + +static const uint8_t type_trns[4] = { 116, 82, 78, 83 }; +static const uint8_t type_chrm[4] = { 99, 72, 82, 77 }; +static const uint8_t type_gama[4] = { 103, 65, 77, 65 }; +static const uint8_t type_iccp[4] = { 105, 67, 67, 80 }; +static const uint8_t type_sbit[4] = { 115, 66, 73, 84 }; +static const uint8_t type_srgb[4] = { 115, 82, 71, 66 }; +static const uint8_t type_text[4] = { 116, 69, 88, 116 }; +static const uint8_t type_ztxt[4] = { 122, 84, 88, 116 }; +static const uint8_t type_itxt[4] = { 105, 84, 88, 116 }; +static const uint8_t type_bkgd[4] = { 98, 75, 71, 68 }; +static const uint8_t type_hist[4] = { 104, 73, 83, 84 }; +static const uint8_t type_phys[4] = { 112, 72, 89, 115 }; +static const uint8_t type_splt[4] = { 115, 80, 76, 84 }; +static const uint8_t type_time[4] = { 116, 73, 77, 69 }; + +static const uint8_t type_offs[4] = { 111, 70, 70, 115 }; +static const uint8_t type_exif[4] = { 101, 88, 73, 102 }; + +static inline void *spng__malloc(spng_ctx *ctx, size_t size) +{ + return ctx->alloc.malloc_fn(size); +} + +static inline void *spng__calloc(spng_ctx *ctx, size_t nmemb, size_t size) +{ + return ctx->alloc.calloc_fn(nmemb, size); +} + +static inline void *spng__realloc(spng_ctx *ctx, void *ptr, size_t size) +{ + return ctx->alloc.realloc_fn(ptr, size); +} + +static inline void spng__free(spng_ctx *ctx, void *ptr) +{ + ctx->alloc.free_fn(ptr); +} + +#if defined(SPNG_USE_MINIZ) +static void *spng__zalloc(void *opaque, size_t items, size_t size) +#else +static void *spng__zalloc(void *opaque, uInt items, uInt size) +#endif +{ + spng_ctx *ctx = opaque; + + if(size > SIZE_MAX / items) return NULL; + + size_t len = (size_t)items * size; + + return spng__malloc(ctx, len); +} + +static void spng__zfree(void *opqaue, void *ptr) +{ + spng_ctx *ctx = opqaue; + spng__free(ctx, ptr); +} + +static inline uint16_t read_u16(const void *src) +{ + const unsigned char *data = src; + + return (data[0] & 0xFFU) << 8 | (data[1] & 0xFFU); +} + +static inline uint32_t read_u32(const void *src) +{ + const unsigned char *data = src; + + return (data[0] & 0xFFUL) << 24 | (data[1] & 0xFFUL) << 16 | + (data[2] & 0xFFUL) << 8 | (data[3] & 0xFFUL); +} + +static inline int32_t read_s32(const void *src) +{ + int32_t ret = (int32_t)read_u32(src); + + return ret; +} + +static inline void write_u16(void *dest, uint16_t x) +{ + unsigned char *data = dest; + + data[0] = x >> 8; + data[1] = x & 0xFF; +} + +static inline void write_u32(void *dest, uint32_t x) +{ + unsigned char *data = dest; + + data[0] = (x >> 24); + data[1] = (x >> 16) & 0xFF; + data[2] = (x >> 8) & 0xFF; + data[3] = x & 0xFF; +} + +static inline void write_s32(void *dest, int32_t x) +{ + uint32_t n = x; + write_u32(dest, n); +} + +/* Returns an iterator for 1,2,4,8-bit samples */ +static struct spng__iter spng__iter_init(unsigned bit_depth, const unsigned char *samples) +{ + struct spng__iter iter = + { + .mask = (uint32_t)(1 << bit_depth) - 1, + .shift_amount = 8 - bit_depth, + .initial_shift = 8 - bit_depth, + .bit_depth = bit_depth, + .samples = samples + }; + + return iter; +} + +/* Returns the current sample unpacked, iterates to the next one */ +static inline uint8_t get_sample(struct spng__iter *iter) +{ + uint8_t x = (iter->samples[0] >> iter->shift_amount) & iter->mask; + + iter->shift_amount -= iter->bit_depth; + + if(iter->shift_amount > 7) + { + iter->shift_amount = iter->initial_shift; + iter->samples++; + } + + return x; +} + +static void u16_row_to_host(void *row, size_t size) +{ + uint16_t *px = row; + size_t i, n = size / 2; + + for(i=0; i < n; i++) + { + px[i] = read_u16(&px[i]); + } +} + +static void u16_row_to_bigendian(void *row, size_t size) +{ + uint16_t *px = (uint16_t*)row; + size_t i, n = size / 2; + + for(i=0; i < n; i++) + { + write_u16(&px[i], px[i]); + } +} + +static void rgb8_row_to_rgba8(const unsigned char *row, unsigned char *out, uint32_t n) +{ + uint32_t i; + for(i=0; i < n; i++) + { + memcpy(out + i * 4, row + i * 3, 3); + out[i*4+3] = 255; + } +} + +static unsigned num_channels(const struct spng_ihdr *ihdr) +{ + switch(ihdr->color_type) + { + case SPNG_COLOR_TYPE_TRUECOLOR: return 3; + case SPNG_COLOR_TYPE_GRAYSCALE_ALPHA: return 2; + case SPNG_COLOR_TYPE_TRUECOLOR_ALPHA: return 4; + case SPNG_COLOR_TYPE_GRAYSCALE: + case SPNG_COLOR_TYPE_INDEXED: + return 1; + default: return 0; + } +} + +/* Calculate scanline width in bits, round up to the nearest byte */ +static int calculate_scanline_width(const struct spng_ihdr *ihdr, uint32_t width, size_t *scanline_width) +{ + if(ihdr == NULL || !width) return SPNG_EINTERNAL; + + size_t res = num_channels(ihdr) * ihdr->bit_depth; + + if(res > SIZE_MAX / width) return SPNG_EOVERFLOW; + res = res * width; + + res += 15; /* Filter byte + 7 for rounding */ + + if(res < 15) return SPNG_EOVERFLOW; + + res /= 8; + + if(res > UINT32_MAX) return SPNG_EOVERFLOW; + + *scanline_width = res; + + return 0; +} + +static int calculate_subimages(struct spng_ctx *ctx) +{ + if(ctx == NULL) return SPNG_EINTERNAL; + + struct spng_ihdr *ihdr = &ctx->ihdr; + struct spng_subimage *sub = ctx->subimage; + + if(ihdr->interlace_method == 1) + { + sub[0].width = (ihdr->width + 7) >> 3; + sub[0].height = (ihdr->height + 7) >> 3; + sub[1].width = (ihdr->width + 3) >> 3; + sub[1].height = (ihdr->height + 7) >> 3; + sub[2].width = (ihdr->width + 3) >> 2; + sub[2].height = (ihdr->height + 3) >> 3; + sub[3].width = (ihdr->width + 1) >> 2; + sub[3].height = (ihdr->height + 3) >> 2; + sub[4].width = (ihdr->width + 1) >> 1; + sub[4].height = (ihdr->height + 1) >> 2; + sub[5].width = ihdr->width >> 1; + sub[5].height = (ihdr->height + 1) >> 1; + sub[6].width = ihdr->width; + sub[6].height = ihdr->height >> 1; + } + else + { + sub[0].width = ihdr->width; + sub[0].height = ihdr->height; + } + + int i; + for(i=0; i < 7; i++) + { + if(sub[i].width == 0 || sub[i].height == 0) continue; + + int ret = calculate_scanline_width(ihdr, sub[i].width, &sub[i].scanline_width); + if(ret) return ret; + + if(sub[ctx->widest_pass].scanline_width < sub[i].scanline_width) ctx->widest_pass = i; + + ctx->last_pass = i; + } + + return 0; +} + +static int check_decode_fmt(const struct spng_ihdr *ihdr, const int fmt) +{ + switch(fmt) + { + case SPNG_FMT_RGBA8: + case SPNG_FMT_RGBA16: + case SPNG_FMT_RGB8: + case SPNG_FMT_PNG: + case SPNG_FMT_RAW: + return 0; + case SPNG_FMT_G8: + case SPNG_FMT_GA8: + if(ihdr->color_type == SPNG_COLOR_TYPE_GRAYSCALE && ihdr->bit_depth <= 8) return 0; + else return SPNG_EFMT; + case SPNG_FMT_GA16: + if(ihdr->color_type == SPNG_COLOR_TYPE_GRAYSCALE && ihdr->bit_depth == 16) return 0; + else return SPNG_EFMT; + default: return SPNG_EFMT; + } +} + +static int calculate_image_width(const struct spng_ihdr *ihdr, int fmt, size_t *len) +{ + if(ihdr == NULL || len == NULL) return SPNG_EINTERNAL; + + size_t res = ihdr->width; + unsigned bytes_per_pixel; + + switch(fmt) + { + case SPNG_FMT_RGBA8: + case SPNG_FMT_GA16: + bytes_per_pixel = 4; + break; + case SPNG_FMT_RGBA16: + bytes_per_pixel = 8; + break; + case SPNG_FMT_RGB8: + bytes_per_pixel = 3; + break; + case SPNG_FMT_PNG: + case SPNG_FMT_RAW: + { + int ret = calculate_scanline_width(ihdr, ihdr->width, &res); + if(ret) return ret; + + res -= 1; /* exclude filter byte */ + bytes_per_pixel = 1; + break; + } + case SPNG_FMT_G8: + bytes_per_pixel = 1; + break; + case SPNG_FMT_GA8: + bytes_per_pixel = 2; + break; + default: return SPNG_EINTERNAL; + } + + if(res > SIZE_MAX / bytes_per_pixel) return SPNG_EOVERFLOW; + res = res * bytes_per_pixel; + + *len = res; + + return 0; +} + +static int calculate_image_size(const struct spng_ihdr *ihdr, int fmt, size_t *len) +{ + if(ihdr == NULL || len == NULL) return SPNG_EINTERNAL; + + size_t res = 0; + + int ret = calculate_image_width(ihdr, fmt, &res); + if(ret) return ret; + + if(res > SIZE_MAX / ihdr->height) return SPNG_EOVERFLOW; + res = res * ihdr->height; + + *len = res; + + return 0; +} + +static int increase_cache_usage(spng_ctx *ctx, size_t bytes, int new_chunk) +{ + if(ctx == NULL || !bytes) return SPNG_EINTERNAL; + + if(new_chunk) + { + ctx->chunk_count_total++; + if(ctx->chunk_count_total < 1) return SPNG_EOVERFLOW; + + if(ctx->chunk_count_total > ctx->chunk_count_limit) return SPNG_ECHUNK_LIMITS; + } + + size_t new_usage = ctx->chunk_cache_usage + bytes; + + if(new_usage < ctx->chunk_cache_usage) return SPNG_EOVERFLOW; + + if(new_usage > ctx->chunk_cache_limit) return SPNG_ECHUNK_LIMITS; + + ctx->chunk_cache_usage = new_usage; + + return 0; +} + +static int decrease_cache_usage(spng_ctx *ctx, size_t usage) +{ + if(ctx == NULL || !usage) return SPNG_EINTERNAL; + if(usage > ctx->chunk_cache_usage) return SPNG_EINTERNAL; + + ctx->chunk_cache_usage -= usage; + + return 0; +} + +static int is_critical_chunk(struct spng_chunk *chunk) +{ + if(chunk == NULL) return 0; + if((chunk->type[0] & (1 << 5)) == 0) return 1; + + return 0; +} + +static int decode_err(spng_ctx *ctx, int err) +{ + ctx->state = SPNG_STATE_INVALID; + + return err; +} + +static int encode_err(spng_ctx *ctx, int err) +{ + ctx->state = SPNG_STATE_INVALID; + + return err; +} + +static inline int read_data(spng_ctx *ctx, size_t bytes) +{ + if(ctx == NULL) return SPNG_EINTERNAL; + if(!bytes) return 0; + + if(ctx->streaming && (bytes > SPNG_READ_SIZE)) return SPNG_EINTERNAL; + + int ret = ctx->read_fn(ctx, ctx->stream_user_ptr, ctx->stream_buf, bytes); + + if(ret) + { + if(ret > 0 || ret < SPNG_IO_ERROR) ret = SPNG_IO_ERROR; + + return ret; + } + + ctx->bytes_read += bytes; + if(ctx->bytes_read < bytes) return SPNG_EOVERFLOW; + + return 0; +} + +/* Ensure there is enough space for encoding starting at ctx->write_ptr */ +static int require_bytes(spng_ctx *ctx, size_t bytes) +{ + if(ctx == NULL) return SPNG_EINTERNAL; + + if(ctx->streaming) + { + if(bytes > ctx->stream_buf_size) + { + size_t new_size = ctx->stream_buf_size; + + /* Start at default IDAT size + header + crc */ + if(new_size < (SPNG_WRITE_SIZE + 12)) new_size = SPNG_WRITE_SIZE + 12; + + if(new_size < bytes) new_size = bytes; + + void *temp = spng__realloc(ctx, ctx->stream_buf, new_size); + + if(temp == NULL) return encode_err(ctx, SPNG_EMEM); + + ctx->stream_buf = temp; + ctx->stream_buf_size = bytes; + ctx->write_ptr = ctx->stream_buf; + } + + return 0; + } + + if(!ctx->internal_buffer) return SPNG_ENODST; + + size_t required = ctx->bytes_encoded + bytes; + if(required < bytes) return SPNG_EOVERFLOW; + + if(required > ctx->out_png_size) + { + size_t new_size = ctx->out_png_size; + + /* Start with a size that doesn't require a realloc() 100% of the time */ + if(new_size < (SPNG_WRITE_SIZE * 2)) new_size = SPNG_WRITE_SIZE * 2; + + /* Prefer the next power of two over the requested size */ + while(new_size < required) + { + if(new_size / SIZE_MAX > 2) return encode_err(ctx, SPNG_EOVERFLOW); + + new_size *= 2; + } + + void *temp = spng__realloc(ctx, ctx->out_png, new_size); + + if(temp == NULL) return encode_err(ctx, SPNG_EMEM); + + ctx->out_png = temp; + ctx->out_png_size = new_size; + ctx->write_ptr = ctx->out_png + ctx->bytes_encoded; + } + + return 0; +} + +static int write_data(spng_ctx *ctx, const void *data, size_t bytes) +{ + if(ctx == NULL) return SPNG_EINTERNAL; + if(!bytes) return 0; + + if(ctx->streaming) + { + if(bytes > SPNG_WRITE_SIZE) return SPNG_EINTERNAL; + + int ret = ctx->write_fn(ctx, ctx->stream_user_ptr, (void*)data, bytes); + + if(ret) + { + if(ret > 0 || ret < SPNG_IO_ERROR) ret = SPNG_IO_ERROR; + + return encode_err(ctx, ret); + } + } + else + { + int ret = require_bytes(ctx, bytes); + if(ret) return encode_err(ctx, ret); + + memcpy(ctx->write_ptr, data, bytes); + + ctx->write_ptr += bytes; + } + + ctx->bytes_encoded += bytes; + if(ctx->bytes_encoded < bytes) return SPNG_EOVERFLOW; + + return 0; +} + +static int write_header(spng_ctx *ctx, const uint8_t chunk_type[4], size_t chunk_length, unsigned char **data) +{ + if(ctx == NULL || chunk_type == NULL) return SPNG_EINTERNAL; + if(chunk_length > spng_u32max) return SPNG_EINTERNAL; + + size_t total = chunk_length + 12; + + int ret = require_bytes(ctx, total); + if(ret) return ret; + + uint32_t crc = crc32(0, NULL, 0); + ctx->current_chunk.crc = crc32(crc, chunk_type, 4); + + memcpy(&ctx->current_chunk.type, chunk_type, 4); + ctx->current_chunk.length = (uint32_t)chunk_length; + + if(!data) return SPNG_EINTERNAL; + + if(ctx->streaming) *data = ctx->stream_buf + 8; + else *data = ctx->write_ptr + 8; + + return 0; +} + +static int trim_chunk(spng_ctx *ctx, uint32_t length) +{ + if(length > spng_u32max) return SPNG_EINTERNAL; + if(length > ctx->current_chunk.length) return SPNG_EINTERNAL; + + ctx->current_chunk.length = length; + + return 0; +} + +static int finish_chunk(spng_ctx *ctx) +{ + if(ctx == NULL) return SPNG_EINTERNAL; + + struct spng_chunk *chunk = &ctx->current_chunk; + + unsigned char *header; + unsigned char *chunk_data; + + if(ctx->streaming) + { + chunk_data = ctx->stream_buf + 8; + header = ctx->stream_buf; + } + else + { + chunk_data = ctx->write_ptr + 8; + header = ctx->write_ptr; + } + + write_u32(header, chunk->length); + memcpy(header + 4, chunk->type, 4); + + chunk->crc = crc32(chunk->crc, chunk_data, chunk->length); + + write_u32(chunk_data + chunk->length, chunk->crc); + + if(ctx->streaming) + { + const unsigned char *ptr = ctx->stream_buf; + uint32_t bytes_left = chunk->length + 12; + uint32_t len = 0; + + while(bytes_left) + { + ptr += len; + len = SPNG_WRITE_SIZE; + + if(len > bytes_left) len = bytes_left; + + int ret = write_data(ctx, ptr, len); + if(ret) return ret; + + bytes_left -= len; + } + } + else + { + ctx->bytes_encoded += chunk->length; + if(ctx->bytes_encoded < chunk->length) return SPNG_EOVERFLOW; + + ctx->bytes_encoded += 12; + if(ctx->bytes_encoded < 12) return SPNG_EOVERFLOW; + + ctx->write_ptr += chunk->length + 12; + } + + return 0; +} + +static int write_chunk(spng_ctx *ctx, const uint8_t type[4], const void *data, size_t length) +{ + if(ctx == NULL || type == NULL) return SPNG_EINTERNAL; + if(length && data == NULL) return SPNG_EINTERNAL; + + unsigned char *write_ptr; + + int ret = write_header(ctx, type, length, &write_ptr); + if(ret) return ret; + + if(length) memcpy(write_ptr, data, length); + + return finish_chunk(ctx); +} + +static int write_iend(spng_ctx *ctx) +{ + unsigned char iend_chunk[12] = { 0, 0, 0, 0, 73, 69, 78, 68, 174, 66, 96, 130 }; + return write_data(ctx, iend_chunk, 12); +} + +static int write_unknown_chunks(spng_ctx *ctx, enum spng_location location) +{ + if(!ctx->stored.unknown) return 0; + + const struct spng_unknown_chunk *chunk = ctx->chunk_list; + + uint32_t i; + for(i=0; i < ctx->n_chunks; i++, chunk++) + { + if(chunk->location != location) continue; + + int ret = write_chunk(ctx, chunk->type, chunk->data, chunk->length); + if(ret) return ret; + } + + return 0; +} + +/* Read and check the current chunk's crc, + returns -SPNG_CRC_DISCARD if the chunk should be discarded */ +static inline int read_and_check_crc(spng_ctx *ctx) +{ + if(ctx == NULL) return SPNG_EINTERNAL; + + int ret; + ret = read_data(ctx, 4); + if(ret) return ret; + + ctx->current_chunk.crc = read_u32(ctx->data); + + if(ctx->skip_crc) return 0; + + if(ctx->cur_actual_crc != ctx->current_chunk.crc) + { + if(is_critical_chunk(&ctx->current_chunk)) + { + if(ctx->crc_action_critical == SPNG_CRC_USE) return 0; + } + else + { + if(ctx->crc_action_ancillary == SPNG_CRC_USE) return 0; + if(ctx->crc_action_ancillary == SPNG_CRC_DISCARD) return -SPNG_CRC_DISCARD; + } + + return SPNG_ECHUNK_CRC; + } + + return 0; +} + +/* Read and validate the current chunk's crc and the next chunk header */ +static inline int read_header(spng_ctx *ctx) +{ + if(ctx == NULL) return SPNG_EINTERNAL; + + int ret; + struct spng_chunk chunk = { 0 }; + + ret = read_and_check_crc(ctx); + if(ret) + { + if(ret == -SPNG_CRC_DISCARD) + { + ctx->discard = 1; + } + else return ret; + } + + ret = read_data(ctx, 8); + if(ret) return ret; + + chunk.offset = ctx->bytes_read - 8; + + chunk.length = read_u32(ctx->data); + + memcpy(&chunk.type, ctx->data + 4, 4); + + if(chunk.length > spng_u32max) return SPNG_ECHUNK_STDLEN; + + ctx->cur_chunk_bytes_left = chunk.length; + + if(is_critical_chunk(&chunk) && ctx->crc_action_critical == SPNG_CRC_USE) ctx->skip_crc = 1; + else if(ctx->crc_action_ancillary == SPNG_CRC_USE) ctx->skip_crc = 1; + else ctx->skip_crc = 0; + + if(!ctx->skip_crc) + { + ctx->cur_actual_crc = crc32(0, NULL, 0); + ctx->cur_actual_crc = crc32(ctx->cur_actual_crc, chunk.type, 4); + } + + ctx->current_chunk = chunk; + + return 0; +} + +/* Read chunk bytes and update crc */ +static int read_chunk_bytes(spng_ctx *ctx, uint32_t bytes) +{ + if(ctx == NULL) return SPNG_EINTERNAL; + if(!ctx->cur_chunk_bytes_left || !bytes) return SPNG_EINTERNAL; + if(bytes > ctx->cur_chunk_bytes_left) return SPNG_EINTERNAL; /* XXX: more specific error? */ + + int ret; + + ret = read_data(ctx, bytes); + if(ret) return ret; + + if(!ctx->skip_crc) ctx->cur_actual_crc = crc32(ctx->cur_actual_crc, ctx->data, bytes); + + ctx->cur_chunk_bytes_left -= bytes; + + return ret; +} + +/* read_chunk_bytes() + read_data() with custom output buffer */ +static int read_chunk_bytes2(spng_ctx *ctx, void *out, uint32_t bytes) +{ + if(ctx == NULL) return SPNG_EINTERNAL; + if(!ctx->cur_chunk_bytes_left || !bytes) return SPNG_EINTERNAL; + if(bytes > ctx->cur_chunk_bytes_left) return SPNG_EINTERNAL; /* XXX: more specific error? */ + + int ret; + uint32_t len = bytes; + + if(ctx->streaming && len > SPNG_READ_SIZE) len = SPNG_READ_SIZE; + + while(bytes) + { + if(len > bytes) len = bytes; + + ret = ctx->read_fn(ctx, ctx->stream_user_ptr, out, len); + if(ret) return ret; + + if(!ctx->streaming) memcpy(out, ctx->data, len); + + ctx->bytes_read += len; + if(ctx->bytes_read < len) return SPNG_EOVERFLOW; + + if(!ctx->skip_crc) ctx->cur_actual_crc = crc32(ctx->cur_actual_crc, out, len); + + ctx->cur_chunk_bytes_left -= len; + + out = (char*)out + len; + bytes -= len; + len = SPNG_READ_SIZE; + } + + return 0; +} + +static int discard_chunk_bytes(spng_ctx *ctx, uint32_t bytes) +{ + if(ctx == NULL) return SPNG_EINTERNAL; + if(!bytes) return 0; + + int ret; + + if(ctx->streaming) /* Do small, consecutive reads */ + { + while(bytes) + { + uint32_t len = SPNG_READ_SIZE; + + if(len > bytes) len = bytes; + + ret = read_chunk_bytes(ctx, len); + if(ret) return ret; + + bytes -= len; + } + } + else + { + ret = read_chunk_bytes(ctx, bytes); + if(ret) return ret; + } + + return 0; +} + +static int spng__inflate_init(spng_ctx *ctx, int window_bits) +{ + if(ctx->zstream.state) inflateEnd(&ctx->zstream); + + ctx->inflate = 1; + + ctx->zstream.zalloc = spng__zalloc; + ctx->zstream.zfree = spng__zfree; + ctx->zstream.opaque = ctx; + + if(inflateInit2(&ctx->zstream, window_bits) != Z_OK) return SPNG_EZLIB_INIT; + +#if ZLIB_VERNUM >= 0x1290 && !defined(SPNG_USE_MINIZ) + + int validate = 1; + + if(ctx->flags & SPNG_CTX_IGNORE_ADLER32) validate = 0; + + if(is_critical_chunk(&ctx->current_chunk)) + { + if(ctx->crc_action_critical == SPNG_CRC_USE) validate = 0; + } + else /* ancillary */ + { + if(ctx->crc_action_ancillary == SPNG_CRC_USE) validate = 0; + } + + if(inflateValidate(&ctx->zstream, validate)) return SPNG_EZLIB_INIT; + +#else /* This requires zlib >= 1.2.11 */ + #pragma message ("inflateValidate() not available, SPNG_CTX_IGNORE_ADLER32 will be ignored") +#endif + + return 0; +} + +static int spng__deflate_init(spng_ctx *ctx, struct spng__zlib_options *options) +{ + if(ctx->zstream.state) deflateEnd(&ctx->zstream); + + ctx->deflate = 1; + + z_stream *zstream = &ctx->zstream; + zstream->zalloc = spng__zalloc; + zstream->zfree = spng__zfree; + zstream->opaque = ctx; + zstream->data_type = options->data_type; + + int ret = deflateInit2(zstream, options->compression_level, Z_DEFLATED, options->window_bits, options->mem_level, options->strategy); + + if(ret != Z_OK) return SPNG_EZLIB_INIT; + + return 0; +} + +/* Inflate a zlib stream starting with start_buf if non-NULL, + continuing from the datastream till an end marker, + allocating and writing the inflated stream to *out, + leaving "extra" bytes at the end, final buffer length is *len. + + Takes into account the chunk size and cache limits. +*/ +static int spng__inflate_stream(spng_ctx *ctx, char **out, size_t *len, size_t extra, const void *start_buf, size_t start_len) +{ + int ret = spng__inflate_init(ctx, 15); + if(ret) return ret; + + size_t max = ctx->chunk_cache_limit - ctx->chunk_cache_usage; + + if(ctx->max_chunk_size < max) max = ctx->max_chunk_size; + + if(extra > max) return SPNG_ECHUNK_LIMITS; + max -= extra; + + uint32_t read_size; + size_t size = 8 * 1024; + void *t, *buf = spng__malloc(ctx, size); + + if(buf == NULL) return SPNG_EMEM; + + z_stream *stream = &ctx->zstream; + + if(start_buf != NULL && start_len) + { + stream->avail_in = (uInt)start_len; + stream->next_in = start_buf; + } + else + { + stream->avail_in = 0; + stream->next_in = NULL; + } + + stream->avail_out = (uInt)size; + stream->next_out = buf; + + while(ret != Z_STREAM_END) + { + ret = inflate(stream, Z_NO_FLUSH); + + if(ret == Z_STREAM_END) break; + + if(ret != Z_OK && ret != Z_BUF_ERROR) + { + ret = SPNG_EZLIB; + goto err; + } + + if(!stream->avail_out) /* Resize buffer */ + { + /* overflow or reached chunk/cache limit */ + if( (2 > SIZE_MAX / size) || (size > max / 2) ) + { + ret = SPNG_ECHUNK_LIMITS; + goto err; + } + + size *= 2; + + t = spng__realloc(ctx, buf, size); + if(t == NULL) goto mem; + + buf = t; + + stream->avail_out = (uInt)size / 2; + stream->next_out = (unsigned char*)buf + size / 2; + } + else if(!stream->avail_in) /* Read more chunk bytes */ + { + read_size = ctx->cur_chunk_bytes_left; + if(ctx->streaming && read_size > SPNG_READ_SIZE) read_size = SPNG_READ_SIZE; + + ret = read_chunk_bytes(ctx, read_size); + + if(ret) + { + if(!read_size) ret = SPNG_EZLIB; + + goto err; + } + + stream->avail_in = read_size; + stream->next_in = ctx->data; + } + } + + size = stream->total_out; + + if(!size) + { + ret = SPNG_EZLIB; + goto err; + } + + size += extra; + if(size < extra) goto mem; + + t = spng__realloc(ctx, buf, size); + if(t == NULL) goto mem; + + buf = t; + + (void)increase_cache_usage(ctx, size, 0); + + *out = buf; + *len = size; + + return 0; + +mem: + ret = SPNG_EMEM; +err: + spng__free(ctx, buf); + return ret; +} + +/* Read at least one byte from the IDAT stream */ +static int read_idat_bytes(spng_ctx *ctx, uint32_t *bytes_read) +{ + if(ctx == NULL || bytes_read == NULL) return SPNG_EINTERNAL; + if(memcmp(ctx->current_chunk.type, type_idat, 4)) return SPNG_EIDAT_TOO_SHORT; + + int ret; + uint32_t len; + + while(!ctx->cur_chunk_bytes_left) + { + ret = read_header(ctx); + if(ret) return ret; + + if(memcmp(ctx->current_chunk.type, type_idat, 4)) return SPNG_EIDAT_TOO_SHORT; + } + + if(ctx->streaming) + {/* TODO: estimate bytes to read for progressive reads */ + len = SPNG_READ_SIZE; + if(len > ctx->cur_chunk_bytes_left) len = ctx->cur_chunk_bytes_left; + } + else len = ctx->current_chunk.length; + + ret = read_chunk_bytes(ctx, len); + + *bytes_read = len; + + return ret; +} + +static int read_scanline_bytes(spng_ctx *ctx, unsigned char *dest, size_t len) +{ + if(ctx == NULL || dest == NULL) return SPNG_EINTERNAL; + + int ret = Z_OK; + uint32_t bytes_read; + + z_stream *zstream = &ctx->zstream; + + zstream->avail_out = (uInt)len; + zstream->next_out = dest; + + while(zstream->avail_out != 0) + { + ret = inflate(zstream, Z_NO_FLUSH); + + if(ret == Z_OK) continue; + + if(ret == Z_STREAM_END) /* Reached an end-marker */ + { + if(zstream->avail_out != 0) return SPNG_EIDAT_TOO_SHORT; + } + else if(ret == Z_BUF_ERROR) /* Read more IDAT bytes */ + { + ret = read_idat_bytes(ctx, &bytes_read); + if(ret) return ret; + + zstream->avail_in = bytes_read; + zstream->next_in = ctx->data; + } + else return SPNG_EIDAT_STREAM; + } + + return 0; +} + +static uint8_t paeth(uint8_t a, uint8_t b, uint8_t c) +{ + int16_t p = a + b - c; + int16_t pa = abs(p - a); + int16_t pb = abs(p - b); + int16_t pc = abs(p - c); + + if(pa <= pb && pa <= pc) return a; + else if(pb <= pc) return b; + + return c; +} + +SPNG_TARGET_CLONES("default,avx2") +static void defilter_up(size_t bytes, unsigned char *row, const unsigned char *prev) +{ + size_t i; + for(i=0; i < bytes; i++) + { + row[i] += prev[i]; + } +} + +/* Defilter *scanline in-place. + *prev_scanline and *scanline should point to the first pixel, + scanline_width is the width of the scanline including the filter byte. +*/ +static int defilter_scanline(const unsigned char *prev_scanline, unsigned char *scanline, + size_t scanline_width, unsigned bytes_per_pixel, unsigned filter) +{ + if(prev_scanline == NULL || scanline == NULL || !scanline_width) return SPNG_EINTERNAL; + + size_t i; + scanline_width--; + + if(filter == 0) return 0; + +#ifndef SPNG_DISABLE_OPT + if(filter == SPNG_FILTER_UP) goto no_opt; + + if(bytes_per_pixel == 4) + { + if(filter == SPNG_FILTER_SUB) + defilter_sub4(scanline_width, scanline); + else if(filter == SPNG_FILTER_AVERAGE) + defilter_avg4(scanline_width, scanline, prev_scanline); + else if(filter == SPNG_FILTER_PAETH) + defilter_paeth4(scanline_width, scanline, prev_scanline); + else return SPNG_EFILTER; + + return 0; + } + else if(bytes_per_pixel == 3) + { + if(filter == SPNG_FILTER_SUB) + defilter_sub3(scanline_width, scanline); + else if(filter == SPNG_FILTER_AVERAGE) + defilter_avg3(scanline_width, scanline, prev_scanline); + else if(filter == SPNG_FILTER_PAETH) + defilter_paeth3(scanline_width, scanline, prev_scanline); + else return SPNG_EFILTER; + + return 0; + } +no_opt: +#endif + + if(filter == SPNG_FILTER_UP) + { + defilter_up(scanline_width, scanline, prev_scanline); + return 0; + } + + for(i=0; i < scanline_width; i++) + { + uint8_t x, a, b, c; + + if(i >= bytes_per_pixel) + { + a = scanline[i - bytes_per_pixel]; + b = prev_scanline[i]; + c = prev_scanline[i - bytes_per_pixel]; + } + else /* First pixel in row */ + { + a = 0; + b = prev_scanline[i]; + c = 0; + } + + x = scanline[i]; + + switch(filter) + { + case SPNG_FILTER_SUB: + { + x = x + a; + break; + } + case SPNG_FILTER_AVERAGE: + { + uint16_t avg = (a + b) / 2; + x = x + avg; + break; + } + case SPNG_FILTER_PAETH: + { + x = x + paeth(a,b,c); + break; + } + } + + scanline[i] = x; + } + + return 0; +} + +static int filter_scanline(unsigned char *filtered, const unsigned char *prev_scanline, const unsigned char *scanline, + size_t scanline_width, unsigned bytes_per_pixel, const unsigned filter) +{ + if(prev_scanline == NULL || scanline == NULL || scanline_width <= 1) return SPNG_EINTERNAL; + + if(filter > 4) return SPNG_EFILTER; + if(filter == 0) return 0; + + scanline_width--; + + uint32_t i; + for(i=0; i < scanline_width; i++) + { + uint8_t x, a, b, c; + + if(i >= bytes_per_pixel) + { + a = scanline[i - bytes_per_pixel]; + b = prev_scanline[i]; + c = prev_scanline[i - bytes_per_pixel]; + } + else /* first pixel in row */ + { + a = 0; + b = prev_scanline[i]; + c = 0; + } + + x = scanline[i]; + + switch(filter) + { + case SPNG_FILTER_SUB: + { + x = x - a; + break; + } + case SPNG_FILTER_UP: + { + x = x - b; + break; + } + case SPNG_FILTER_AVERAGE: + { + uint16_t avg = (a + b) / 2; + x = x - avg; + break; + } + case SPNG_FILTER_PAETH: + { + x = x - paeth(a,b,c); + break; + } + } + + filtered[i] = x; + } + + return 0; +} + +static int32_t filter_sum(const unsigned char *prev_scanline, const unsigned char *scanline, + size_t size, unsigned bytes_per_pixel, const unsigned filter) +{ + /* prevent potential over/underflow, bails out at a width of ~8M pixels for RGBA8 */ + if(size > (INT32_MAX / 128)) return INT32_MAX; + + uint32_t i; + int32_t sum = 0; + uint8_t x, a, b, c; + + for(i=0; i < size; i++) + { + if(i >= bytes_per_pixel) + { + a = scanline[i - bytes_per_pixel]; + b = prev_scanline[i]; + c = prev_scanline[i - bytes_per_pixel]; + } + else /* first pixel in row */ + { + a = 0; + b = prev_scanline[i]; + c = 0; + } + + x = scanline[i]; + + switch(filter) + { + case SPNG_FILTER_NONE: + { + break; + } + case SPNG_FILTER_SUB: + { + x = x - a; + break; + } + case SPNG_FILTER_UP: + { + x = x - b; + break; + } + case SPNG_FILTER_AVERAGE: + { + uint16_t avg = (a + b) / 2; + x = x - avg; + break; + } + case SPNG_FILTER_PAETH: + { + x = x - paeth(a,b,c); + break; + } + } + + sum += 128 - abs((int)x - 128); + } + + return sum; +} + +static unsigned get_best_filter(const unsigned char *prev_scanline, const unsigned char *scanline, + size_t scanline_width, unsigned bytes_per_pixel, const int choices) +{ + if(!choices) return SPNG_FILTER_NONE; + + scanline_width--; + + int i; + unsigned int best_filter = 0; + enum spng_filter_choice flag; + int32_t sum, best_score = INT32_MAX; + int32_t filter_scores[5] = { INT32_MAX, INT32_MAX, INT32_MAX, INT32_MAX, INT32_MAX }; + + if( !(choices & (choices - 1)) ) + {/* only one choice/bit is set */ + for(i=0; i < 5; i++) + { + if(choices == 1 << (i + 3)) return i; + } + } + + for(i=0; i < 5; i++) + { + flag = 1 << (i + 3); + + if(choices & flag) sum = filter_sum(prev_scanline, scanline, scanline_width, bytes_per_pixel, i); + else continue; + + filter_scores[i] = abs(sum); + + if(filter_scores[i] < best_score) + { + best_score = filter_scores[i]; + best_filter = i; + } + } + + return best_filter; +} + +/* Scale "sbits" significant bits in "sample" from "bit_depth" to "target" + + "bit_depth" must be a valid PNG depth + "sbits" must be less than or equal to "bit_depth" + "target" must be between 1 and 16 +*/ +static uint16_t sample_to_target(uint16_t sample, unsigned bit_depth, unsigned sbits, unsigned target) +{ + if(bit_depth == sbits) + { + if(target == sbits) return sample; /* No scaling */ + }/* bit_depth > sbits */ + else sample = sample >> (bit_depth - sbits); /* Shift significant bits to bottom */ + + /* Downscale */ + if(target < sbits) return sample >> (sbits - target); + + /* Upscale using left bit replication */ + int8_t shift_amount = target - sbits; + uint16_t sample_bits = sample; + sample = 0; + + while(shift_amount >= 0) + { + sample = sample | (sample_bits << shift_amount); + shift_amount -= sbits; + } + + int8_t partial = shift_amount + (int8_t)sbits; + + if(partial != 0) sample = sample | (sample_bits >> abs(shift_amount)); + + return sample; +} + +static inline void gamma_correct_row(unsigned char *row, uint32_t pixels, int fmt, const uint16_t *gamma_lut) +{ + uint32_t i; + + if(fmt == SPNG_FMT_RGBA8) + { + unsigned char *px; + for(i=0; i < pixels; i++) + { + px = row + i * 4; + + px[0] = gamma_lut[px[0]]; + px[1] = gamma_lut[px[1]]; + px[2] = gamma_lut[px[2]]; + } + } + else if(fmt == SPNG_FMT_RGBA16) + { + for(i=0; i < pixels; i++) + { + uint16_t px[4]; + memcpy(px, row + i * 8, 8); + + px[0] = gamma_lut[px[0]]; + px[1] = gamma_lut[px[1]]; + px[2] = gamma_lut[px[2]]; + + memcpy(row + i * 8, px, 8); + } + } + else if(fmt == SPNG_FMT_RGB8) + { + unsigned char *px; + for(i=0; i < pixels; i++) + { + px = row + i * 3; + + px[0] = gamma_lut[px[0]]; + px[1] = gamma_lut[px[1]]; + px[2] = gamma_lut[px[2]]; + } + } +} + +/* Apply transparency to output row */ +static inline void trns_row(unsigned char *row, + const unsigned char *scanline, + const unsigned char *trns, + unsigned scanline_stride, + struct spng_ihdr *ihdr, + uint32_t pixels, + int fmt) +{ + uint32_t i; + unsigned row_stride; + unsigned depth = ihdr->bit_depth; + + if(fmt == SPNG_FMT_RGBA8) + { + if(ihdr->color_type == SPNG_COLOR_TYPE_GRAYSCALE) return; /* already applied in the decoding loop */ + + row_stride = 4; + for(i=0; i < pixels; i++, scanline+=scanline_stride, row+=row_stride) + { + if(!memcmp(scanline, trns, scanline_stride)) row[3] = 0; + } + } + else if(fmt == SPNG_FMT_RGBA16) + { + if(ihdr->color_type == SPNG_COLOR_TYPE_GRAYSCALE) return; /* already applied in the decoding loop */ + + row_stride = 8; + for(i=0; i < pixels; i++, scanline+=scanline_stride, row+=row_stride) + { + if(!memcmp(scanline, trns, scanline_stride)) memset(row + 6, 0, 2); + } + } + else if(fmt == SPNG_FMT_GA8) + { + row_stride = 2; + + if(depth == 16) + { + for(i=0; i < pixels; i++, scanline+=scanline_stride, row+=row_stride) + { + if(!memcmp(scanline, trns, scanline_stride)) memset(row + 1, 0, 1); + } + } + else /* depth <= 8 */ + { + struct spng__iter iter = spng__iter_init(depth, scanline); + + for(i=0; i < pixels; i++, row+=row_stride) + { + if(trns[0] == get_sample(&iter)) row[1] = 0; + } + } + } + else if(fmt == SPNG_FMT_GA16) + { + row_stride = 4; + + if(depth == 16) + { + for(i=0; i< pixels; i++, scanline+=scanline_stride, row+=row_stride) + { + if(!memcmp(scanline, trns, 2)) memset(row + 2, 0, 2); + } + } + else + { + struct spng__iter iter = spng__iter_init(depth, scanline); + + for(i=0; i< pixels; i++, row+=row_stride) + { + if(trns[0] == get_sample(&iter)) memset(row + 2, 0, 2); + } + } + } + else return; +} + +static inline void scale_row(unsigned char *row, uint32_t pixels, int fmt, unsigned depth, const struct spng_sbit *sbit) +{ + uint32_t i; + + if(fmt == SPNG_FMT_RGBA8) + { + unsigned char px[4]; + for(i=0; i < pixels; i++) + { + memcpy(px, row + i * 4, 4); + + px[0] = sample_to_target(px[0], depth, sbit->red_bits, 8); + px[1] = sample_to_target(px[1], depth, sbit->green_bits, 8); + px[2] = sample_to_target(px[2], depth, sbit->blue_bits, 8); + px[3] = sample_to_target(px[3], depth, sbit->alpha_bits, 8); + + memcpy(row + i * 4, px, 4); + } + } + else if(fmt == SPNG_FMT_RGBA16) + { + uint16_t px[4]; + for(i=0; i < pixels; i++) + { + memcpy(px, row + i * 8, 8); + + px[0] = sample_to_target(px[0], depth, sbit->red_bits, 16); + px[1] = sample_to_target(px[1], depth, sbit->green_bits, 16); + px[2] = sample_to_target(px[2], depth, sbit->blue_bits, 16); + px[3] = sample_to_target(px[3], depth, sbit->alpha_bits, 16); + + memcpy(row + i * 8, px, 8); + } + } + else if(fmt == SPNG_FMT_RGB8) + { + unsigned char px[4]; + for(i=0; i < pixels; i++) + { + memcpy(px, row + i * 3, 3); + + px[0] = sample_to_target(px[0], depth, sbit->red_bits, 8); + px[1] = sample_to_target(px[1], depth, sbit->green_bits, 8); + px[2] = sample_to_target(px[2], depth, sbit->blue_bits, 8); + + memcpy(row + i * 3, px, 3); + } + } + else if(fmt == SPNG_FMT_G8) + { + for(i=0; i < pixels; i++) + { + row[i] = sample_to_target(row[i], depth, sbit->grayscale_bits, 8); + } + } + else if(fmt == SPNG_FMT_GA8) + { + for(i=0; i < pixels; i++) + { + row[i*2] = sample_to_target(row[i*2], depth, sbit->grayscale_bits, 8); + } + } +} + +/* Expand to *row using 8-bit palette indices from *scanline */ +static void expand_row(unsigned char *row, + const unsigned char *scanline, + const union spng__decode_plte *decode_plte, + uint32_t width, + int fmt) +{ + uint32_t i = 0; + unsigned char *px; + unsigned char entry; + const struct spng_plte_entry *plte = decode_plte->rgba; + +#if defined(SPNG_ARM) + if(fmt == SPNG_FMT_RGBA8) i = expand_palette_rgba8_neon(row, scanline, decode_plte->raw, width); + else if(fmt == SPNG_FMT_RGB8) + { + i = expand_palette_rgb8_neon(row, scanline, decode_plte->raw, width); + + for(; i < width; i++) + {/* In this case the LUT is 3 bytes packed */ + px = row + i * 3; + entry = scanline[i]; + px[0] = decode_plte->raw[entry * 3 + 0]; + px[1] = decode_plte->raw[entry * 3 + 1]; + px[2] = decode_plte->raw[entry * 3 + 2]; + } + return; + } +#endif + + if(fmt == SPNG_FMT_RGBA8) + { + for(; i < width; i++) + { + px = row + i * 4; + entry = scanline[i]; + px[0] = plte[entry].red; + px[1] = plte[entry].green; + px[2] = plte[entry].blue; + px[3] = plte[entry].alpha; + } + } + else if(fmt == SPNG_FMT_RGB8) + { + for(; i < width; i++) + { + px = row + i * 3; + entry = scanline[i]; + px[0] = plte[entry].red; + px[1] = plte[entry].green; + px[2] = plte[entry].blue; + } + } +} + +/* Unpack 1/2/4/8-bit samples to G8/GA8/GA16 or G16 -> GA16 */ +static void unpack_scanline(unsigned char *out, const unsigned char *scanline, uint32_t width, unsigned bit_depth, int fmt) +{ + struct spng__iter iter = spng__iter_init(bit_depth, scanline); + uint32_t i; + uint16_t sample, alpha = 65535; + + + if(fmt == SPNG_FMT_GA8) goto ga8; + else if(fmt == SPNG_FMT_GA16) goto ga16; + + /* 1/2/4-bit -> 8-bit */ + for(i=0; i < width; i++) out[i] = get_sample(&iter); + + return; + +ga8: + /* 1/2/4/8-bit -> GA8 */ + for(i=0; i < width; i++) + { + out[i*2] = get_sample(&iter); + out[i*2 + 1] = 255; + } + + return; + +ga16: + + /* 16 -> GA16 */ + if(bit_depth == 16) + { + for(i=0; i < width; i++) + { + memcpy(out + i * 4, scanline + i * 2, 2); + memcpy(out + i * 4 + 2, &alpha, 2); + } + return; + } + + /* 1/2/4/8-bit -> GA16 */ + for(i=0; i < width; i++) + { + sample = get_sample(&iter); + memcpy(out + i * 4, &sample, 2); + memcpy(out + i * 4 + 2, &alpha, 2); + } +} + +static int check_ihdr(const struct spng_ihdr *ihdr, uint32_t max_width, uint32_t max_height) +{ + if(ihdr->width > spng_u32max || !ihdr->width) return SPNG_EWIDTH; + if(ihdr->height > spng_u32max || !ihdr->height) return SPNG_EHEIGHT; + + if(ihdr->width > max_width) return SPNG_EUSER_WIDTH; + if(ihdr->height > max_height) return SPNG_EUSER_HEIGHT; + + switch(ihdr->color_type) + { + case SPNG_COLOR_TYPE_GRAYSCALE: + { + if( !(ihdr->bit_depth == 1 || ihdr->bit_depth == 2 || + ihdr->bit_depth == 4 || ihdr->bit_depth == 8 || + ihdr->bit_depth == 16) ) + return SPNG_EBIT_DEPTH; + + break; + } + case SPNG_COLOR_TYPE_TRUECOLOR: + case SPNG_COLOR_TYPE_GRAYSCALE_ALPHA: + case SPNG_COLOR_TYPE_TRUECOLOR_ALPHA: + { + if( !(ihdr->bit_depth == 8 || ihdr->bit_depth == 16) ) + return SPNG_EBIT_DEPTH; + + break; + } + case SPNG_COLOR_TYPE_INDEXED: + { + if( !(ihdr->bit_depth == 1 || ihdr->bit_depth == 2 || + ihdr->bit_depth == 4 || ihdr->bit_depth == 8) ) + return SPNG_EBIT_DEPTH; + + break; + } + default: return SPNG_ECOLOR_TYPE; + } + + if(ihdr->compression_method) return SPNG_ECOMPRESSION_METHOD; + if(ihdr->filter_method) return SPNG_EFILTER_METHOD; + + if(ihdr->interlace_method > 1) return SPNG_EINTERLACE_METHOD; + + return 0; +} + +static int check_plte(const struct spng_plte *plte, const struct spng_ihdr *ihdr) +{ + if(plte == NULL || ihdr == NULL) return 1; + + if(plte->n_entries == 0) return 1; + if(plte->n_entries > 256) return 1; + + if(ihdr->color_type == SPNG_COLOR_TYPE_INDEXED) + { + if(plte->n_entries > (1U << ihdr->bit_depth)) return 1; + } + + return 0; +} + +static int check_sbit(const struct spng_sbit *sbit, const struct spng_ihdr *ihdr) +{ + if(sbit == NULL || ihdr == NULL) return 1; + + if(ihdr->color_type == 0) + { + if(sbit->grayscale_bits == 0) return SPNG_ESBIT; + if(sbit->grayscale_bits > ihdr->bit_depth) return SPNG_ESBIT; + } + else if(ihdr->color_type == 2 || ihdr->color_type == 3) + { + if(sbit->red_bits == 0) return SPNG_ESBIT; + if(sbit->green_bits == 0) return SPNG_ESBIT; + if(sbit->blue_bits == 0) return SPNG_ESBIT; + + uint8_t bit_depth; + if(ihdr->color_type == 3) bit_depth = 8; + else bit_depth = ihdr->bit_depth; + + if(sbit->red_bits > bit_depth) return SPNG_ESBIT; + if(sbit->green_bits > bit_depth) return SPNG_ESBIT; + if(sbit->blue_bits > bit_depth) return SPNG_ESBIT; + } + else if(ihdr->color_type == 4) + { + if(sbit->grayscale_bits == 0) return SPNG_ESBIT; + if(sbit->alpha_bits == 0) return SPNG_ESBIT; + + if(sbit->grayscale_bits > ihdr->bit_depth) return SPNG_ESBIT; + if(sbit->alpha_bits > ihdr->bit_depth) return SPNG_ESBIT; + } + else if(ihdr->color_type == 6) + { + if(sbit->red_bits == 0) return SPNG_ESBIT; + if(sbit->green_bits == 0) return SPNG_ESBIT; + if(sbit->blue_bits == 0) return SPNG_ESBIT; + if(sbit->alpha_bits == 0) return SPNG_ESBIT; + + if(sbit->red_bits > ihdr->bit_depth) return SPNG_ESBIT; + if(sbit->green_bits > ihdr->bit_depth) return SPNG_ESBIT; + if(sbit->blue_bits > ihdr->bit_depth) return SPNG_ESBIT; + if(sbit->alpha_bits > ihdr->bit_depth) return SPNG_ESBIT; + } + + return 0; +} + +static int check_chrm_int(const struct spng_chrm_int *chrm_int) +{ + if(chrm_int == NULL) return 1; + + if(chrm_int->white_point_x > spng_u32max || + chrm_int->white_point_y > spng_u32max || + chrm_int->red_x > spng_u32max || + chrm_int->red_y > spng_u32max || + chrm_int->green_x > spng_u32max || + chrm_int->green_y > spng_u32max || + chrm_int->blue_x > spng_u32max || + chrm_int->blue_y > spng_u32max) return SPNG_ECHRM; + + return 0; +} + +static int check_phys(const struct spng_phys *phys) +{ + if(phys == NULL) return 1; + + if(phys->unit_specifier > 1) return SPNG_EPHYS; + + if(phys->ppu_x > spng_u32max) return SPNG_EPHYS; + if(phys->ppu_y > spng_u32max) return SPNG_EPHYS; + + return 0; +} + +static int check_time(const struct spng_time *time) +{ + if(time == NULL) return 1; + + if(time->month == 0 || time->month > 12) return 1; + if(time->day == 0 || time->day > 31) return 1; + if(time->hour > 23) return 1; + if(time->minute > 59) return 1; + if(time->second > 60) return 1; + + return 0; +} + +static int check_offs(const struct spng_offs *offs) +{ + if(offs == NULL) return 1; + + if(offs->unit_specifier > 1) return 1; + + return 0; +} + +static int check_exif(const struct spng_exif *exif) +{ + if(exif == NULL) return 1; + if(exif->data == NULL) return 1; + + if(exif->length < 4) return SPNG_ECHUNK_SIZE; + if(exif->length > spng_u32max) return SPNG_ECHUNK_STDLEN; + + const uint8_t exif_le[4] = { 73, 73, 42, 0 }; + const uint8_t exif_be[4] = { 77, 77, 0, 42 }; + + if(memcmp(exif->data, exif_le, 4) && memcmp(exif->data, exif_be, 4)) return 1; + + return 0; +} + +/* Validate PNG keyword */ +static int check_png_keyword(const char *str) +{ + if(str == NULL) return 1; + size_t len = strlen(str); + const char *end = str + len; + + if(!len) return 1; + if(len > 79) return 1; + if(str[0] == ' ') return 1; /* Leading space */ + if(end[-1] == ' ') return 1; /* Trailing space */ + if(strstr(str, " ") != NULL) return 1; /* Consecutive spaces */ + + uint8_t c; + while(str != end) + { + memcpy(&c, str, 1); + + if( (c >= 32 && c <= 126) || (c >= 161) ) str++; + else return 1; /* Invalid character */ + } + + return 0; +} + +/* Validate PNG text *str up to 'len' bytes */ +static int check_png_text(const char *str, size_t len) +{/* XXX: are consecutive newlines permitted? */ + if(str == NULL || len == 0) return 1; + + uint8_t c; + size_t i = 0; + while(i < len) + { + memcpy(&c, str + i, 1); + + if( (c >= 32 && c <= 126) || (c >= 161) || c == 10) i++; + else return 1; /* Invalid character */ + } + + return 0; +} + +/* Returns non-zero for standard chunks which are stored without allocating memory */ +static int is_small_chunk(uint8_t type[4]) +{ + if(!memcmp(type, type_plte, 4)) return 1; + else if(!memcmp(type, type_chrm, 4)) return 1; + else if(!memcmp(type, type_gama, 4)) return 1; + else if(!memcmp(type, type_sbit, 4)) return 1; + else if(!memcmp(type, type_srgb, 4)) return 1; + else if(!memcmp(type, type_bkgd, 4)) return 1; + else if(!memcmp(type, type_trns, 4)) return 1; + else if(!memcmp(type, type_hist, 4)) return 1; + else if(!memcmp(type, type_phys, 4)) return 1; + else if(!memcmp(type, type_time, 4)) return 1; + else if(!memcmp(type, type_offs, 4)) return 1; + else return 0; +} + +static int read_ihdr(spng_ctx *ctx) +{ + int ret; + struct spng_chunk *chunk = &ctx->current_chunk; + const unsigned char *data; + + chunk->offset = 8; + chunk->length = 13; + size_t sizeof_sig_ihdr = 29; + + ret = read_data(ctx, sizeof_sig_ihdr); + if(ret) return ret; + + data = ctx->data; + + if(memcmp(data, spng_signature, sizeof(spng_signature))) return SPNG_ESIGNATURE; + + chunk->length = read_u32(data + 8); + memcpy(&chunk->type, data + 12, 4); + + if(chunk->length != 13) return SPNG_EIHDR_SIZE; + if(memcmp(chunk->type, type_ihdr, 4)) return SPNG_ENOIHDR; + + ctx->cur_actual_crc = crc32(0, NULL, 0); + ctx->cur_actual_crc = crc32(ctx->cur_actual_crc, data + 12, 17); + + ctx->ihdr.width = read_u32(data + 16); + ctx->ihdr.height = read_u32(data + 20); + ctx->ihdr.bit_depth = data[24]; + ctx->ihdr.color_type = data[25]; + ctx->ihdr.compression_method = data[26]; + ctx->ihdr.filter_method = data[27]; + ctx->ihdr.interlace_method = data[28]; + + ret = check_ihdr(&ctx->ihdr, ctx->max_width, ctx->max_height); + if(ret) return ret; + + ctx->file.ihdr = 1; + ctx->stored.ihdr = 1; + + if(ctx->ihdr.bit_depth < 8) ctx->bytes_per_pixel = 1; + else ctx->bytes_per_pixel = num_channels(&ctx->ihdr) * (ctx->ihdr.bit_depth / 8); + + ret = calculate_subimages(ctx); + if(ret) return ret; + + return 0; +} + +static void splt_undo(spng_ctx *ctx) +{ + struct spng_splt *splt = &ctx->splt_list[ctx->n_splt - 1]; + + spng__free(ctx, splt->entries); + + decrease_cache_usage(ctx, sizeof(struct spng_splt)); + decrease_cache_usage(ctx, splt->n_entries * sizeof(struct spng_splt_entry)); + + splt->entries = NULL; + + ctx->n_splt--; +} + +static void text_undo(spng_ctx *ctx) +{ + struct spng_text2 *text = &ctx->text_list[ctx->n_text - 1]; + + spng__free(ctx, text->keyword); + if(text->compression_flag) spng__free(ctx, text->text); + + decrease_cache_usage(ctx, text->cache_usage); + decrease_cache_usage(ctx, sizeof(struct spng_text2)); + + text->keyword = NULL; + text->text = NULL; + + ctx->n_text--; +} + +static void chunk_undo(spng_ctx *ctx) +{ + struct spng_unknown_chunk *chunk = &ctx->chunk_list[ctx->n_chunks - 1]; + + spng__free(ctx, chunk->data); + + decrease_cache_usage(ctx, chunk->length); + decrease_cache_usage(ctx, sizeof(struct spng_unknown_chunk)); + + chunk->data = NULL; + + ctx->n_chunks--; +} + +static int read_non_idat_chunks(spng_ctx *ctx) +{ + int ret; + struct spng_chunk chunk; + const unsigned char *data; + + ctx->discard = 0; + ctx->undo = NULL; + ctx->prev_stored = ctx->stored; + + while( !(ret = read_header(ctx))) + { + if(ctx->discard) + { + if(ctx->undo) ctx->undo(ctx); + + ctx->stored = ctx->prev_stored; + } + + ctx->discard = 0; + ctx->undo = NULL; + + ctx->prev_stored = ctx->stored; + chunk = ctx->current_chunk; + + if(!memcmp(chunk.type, type_idat, 4)) + { + if(ctx->state < SPNG_STATE_FIRST_IDAT) + { + if(ctx->ihdr.color_type == 3 && !ctx->stored.plte) return SPNG_ENOPLTE; + + ctx->first_idat = chunk; + return 0; + } + + if(ctx->prev_was_idat) + { + /* Ignore extra IDAT's */ + ret = discard_chunk_bytes(ctx, chunk.length); + if(ret) return ret; + + continue; + } + else return SPNG_ECHUNK_POS; /* IDAT chunk not at the end of the IDAT sequence */ + } + + ctx->prev_was_idat = 0; + + if(is_small_chunk(chunk.type)) + { + /* None of the known chunks can be zero length */ + if(!chunk.length) return SPNG_ECHUNK_SIZE; + + /* The largest of these chunks is PLTE with 256 entries */ + ret = read_chunk_bytes(ctx, chunk.length > 768 ? 768 : chunk.length); + if(ret) return ret; + } + + data = ctx->data; + + if(is_critical_chunk(&chunk)) + { + if(!memcmp(chunk.type, type_plte, 4)) + { + if(ctx->file.trns || ctx->file.hist || ctx->file.bkgd) return SPNG_ECHUNK_POS; + if(chunk.length % 3 != 0) return SPNG_ECHUNK_SIZE; + + ctx->plte.n_entries = chunk.length / 3; + + if(check_plte(&ctx->plte, &ctx->ihdr)) return SPNG_ECHUNK_SIZE; /* XXX: EPLTE? */ + + size_t i; + for(i=0; i < ctx->plte.n_entries; i++) + { + ctx->plte.entries[i].red = data[i * 3]; + ctx->plte.entries[i].green = data[i * 3 + 1]; + ctx->plte.entries[i].blue = data[i * 3 + 2]; + } + + ctx->file.plte = 1; + ctx->stored.plte = 1; + } + else if(!memcmp(chunk.type, type_iend, 4)) + { + if(ctx->state == SPNG_STATE_AFTER_IDAT) + { + if(chunk.length) return SPNG_ECHUNK_SIZE; + + ret = read_and_check_crc(ctx); + if(ret == -SPNG_CRC_DISCARD) ret = 0; + + return ret; + } + else return SPNG_ECHUNK_POS; + } + else if(!memcmp(chunk.type, type_ihdr, 4)) return SPNG_ECHUNK_POS; + else return SPNG_ECHUNK_UNKNOWN_CRITICAL; + } + else if(!memcmp(chunk.type, type_chrm, 4)) /* Ancillary chunks */ + { + if(ctx->file.plte) return SPNG_ECHUNK_POS; + if(ctx->state == SPNG_STATE_AFTER_IDAT) return SPNG_ECHUNK_POS; + if(ctx->file.chrm) return SPNG_EDUP_CHRM; + + if(chunk.length != 32) return SPNG_ECHUNK_SIZE; + + ctx->chrm_int.white_point_x = read_u32(data); + ctx->chrm_int.white_point_y = read_u32(data + 4); + ctx->chrm_int.red_x = read_u32(data + 8); + ctx->chrm_int.red_y = read_u32(data + 12); + ctx->chrm_int.green_x = read_u32(data + 16); + ctx->chrm_int.green_y = read_u32(data + 20); + ctx->chrm_int.blue_x = read_u32(data + 24); + ctx->chrm_int.blue_y = read_u32(data + 28); + + if(check_chrm_int(&ctx->chrm_int)) return SPNG_ECHRM; + + ctx->file.chrm = 1; + ctx->stored.chrm = 1; + } + else if(!memcmp(chunk.type, type_gama, 4)) + { + if(ctx->file.plte) return SPNG_ECHUNK_POS; + if(ctx->state == SPNG_STATE_AFTER_IDAT) return SPNG_ECHUNK_POS; + if(ctx->file.gama) return SPNG_EDUP_GAMA; + + if(chunk.length != 4) return SPNG_ECHUNK_SIZE; + + ctx->gama = read_u32(data); + + if(!ctx->gama) return SPNG_EGAMA; + if(ctx->gama > spng_u32max) return SPNG_EGAMA; + + ctx->file.gama = 1; + ctx->stored.gama = 1; + } + else if(!memcmp(chunk.type, type_sbit, 4)) + { + if(ctx->file.plte) return SPNG_ECHUNK_POS; + if(ctx->state == SPNG_STATE_AFTER_IDAT) return SPNG_ECHUNK_POS; + if(ctx->file.sbit) return SPNG_EDUP_SBIT; + + if(ctx->ihdr.color_type == 0) + { + if(chunk.length != 1) return SPNG_ECHUNK_SIZE; + + ctx->sbit.grayscale_bits = data[0]; + } + else if(ctx->ihdr.color_type == 2 || ctx->ihdr.color_type == 3) + { + if(chunk.length != 3) return SPNG_ECHUNK_SIZE; + + ctx->sbit.red_bits = data[0]; + ctx->sbit.green_bits = data[1]; + ctx->sbit.blue_bits = data[2]; + } + else if(ctx->ihdr.color_type == 4) + { + if(chunk.length != 2) return SPNG_ECHUNK_SIZE; + + ctx->sbit.grayscale_bits = data[0]; + ctx->sbit.alpha_bits = data[1]; + } + else if(ctx->ihdr.color_type == 6) + { + if(chunk.length != 4) return SPNG_ECHUNK_SIZE; + + ctx->sbit.red_bits = data[0]; + ctx->sbit.green_bits = data[1]; + ctx->sbit.blue_bits = data[2]; + ctx->sbit.alpha_bits = data[3]; + } + + if(check_sbit(&ctx->sbit, &ctx->ihdr)) return SPNG_ESBIT; + + ctx->file.sbit = 1; + ctx->stored.sbit = 1; + } + else if(!memcmp(chunk.type, type_srgb, 4)) + { + if(ctx->file.plte) return SPNG_ECHUNK_POS; + if(ctx->state == SPNG_STATE_AFTER_IDAT) return SPNG_ECHUNK_POS; + if(ctx->file.srgb) return SPNG_EDUP_SRGB; + + if(chunk.length != 1) return SPNG_ECHUNK_SIZE; + + ctx->srgb_rendering_intent = data[0]; + + if(ctx->srgb_rendering_intent > 3) return SPNG_ESRGB; + + ctx->file.srgb = 1; + ctx->stored.srgb = 1; + } + else if(!memcmp(chunk.type, type_bkgd, 4)) + { + if(ctx->state == SPNG_STATE_AFTER_IDAT) return SPNG_ECHUNK_POS; + if(ctx->file.bkgd) return SPNG_EDUP_BKGD; + + if(ctx->ihdr.color_type == 0 || ctx->ihdr.color_type == 4) + { + if(chunk.length != 2) return SPNG_ECHUNK_SIZE; + + ctx->bkgd.gray = read_u16(data); + } + else if(ctx->ihdr.color_type == 2 || ctx->ihdr.color_type == 6) + { + if(chunk.length != 6) return SPNG_ECHUNK_SIZE; + + ctx->bkgd.red = read_u16(data); + ctx->bkgd.green = read_u16(data + 2); + ctx->bkgd.blue = read_u16(data + 4); + } + else if(ctx->ihdr.color_type == 3) + { + if(chunk.length != 1) return SPNG_ECHUNK_SIZE; + if(!ctx->file.plte) return SPNG_EBKGD_NO_PLTE; + + ctx->bkgd.plte_index = data[0]; + if(ctx->bkgd.plte_index >= ctx->plte.n_entries) return SPNG_EBKGD_PLTE_IDX; + } + + ctx->file.bkgd = 1; + ctx->stored.bkgd = 1; + } + else if(!memcmp(chunk.type, type_trns, 4)) + { + if(ctx->state == SPNG_STATE_AFTER_IDAT) return SPNG_ECHUNK_POS; + if(ctx->file.trns) return SPNG_EDUP_TRNS; + if(!chunk.length) return SPNG_ECHUNK_SIZE; + + if(ctx->ihdr.color_type == 0) + { + if(chunk.length != 2) return SPNG_ECHUNK_SIZE; + + ctx->trns.gray = read_u16(data); + } + else if(ctx->ihdr.color_type == 2) + { + if(chunk.length != 6) return SPNG_ECHUNK_SIZE; + + ctx->trns.red = read_u16(data); + ctx->trns.green = read_u16(data + 2); + ctx->trns.blue = read_u16(data + 4); + } + else if(ctx->ihdr.color_type == 3) + { + if(chunk.length > ctx->plte.n_entries) return SPNG_ECHUNK_SIZE; + if(!ctx->file.plte) return SPNG_ETRNS_NO_PLTE; + + memcpy(ctx->trns.type3_alpha, data, chunk.length); + ctx->trns.n_type3_entries = chunk.length; + } + + if(ctx->ihdr.color_type == 4 || ctx->ihdr.color_type == 6) return SPNG_ETRNS_COLOR_TYPE; + + ctx->file.trns = 1; + ctx->stored.trns = 1; + } + else if(!memcmp(chunk.type, type_hist, 4)) + { + if(!ctx->file.plte) return SPNG_EHIST_NO_PLTE; + if(ctx->state == SPNG_STATE_AFTER_IDAT) return SPNG_ECHUNK_POS; + if(ctx->file.hist) return SPNG_EDUP_HIST; + + if( (chunk.length / 2) != (ctx->plte.n_entries) ) return SPNG_ECHUNK_SIZE; + + size_t k; + for(k=0; k < (chunk.length / 2); k++) + { + ctx->hist.frequency[k] = read_u16(data + k*2); + } + + ctx->file.hist = 1; + ctx->stored.hist = 1; + } + else if(!memcmp(chunk.type, type_phys, 4)) + { + if(ctx->state == SPNG_STATE_AFTER_IDAT) return SPNG_ECHUNK_POS; + if(ctx->file.phys) return SPNG_EDUP_PHYS; + + if(chunk.length != 9) return SPNG_ECHUNK_SIZE; + + ctx->phys.ppu_x = read_u32(data); + ctx->phys.ppu_y = read_u32(data + 4); + ctx->phys.unit_specifier = data[8]; + + if(check_phys(&ctx->phys)) return SPNG_EPHYS; + + ctx->file.phys = 1; + ctx->stored.phys = 1; + } + else if(!memcmp(chunk.type, type_time, 4)) + { + if(ctx->file.time) return SPNG_EDUP_TIME; + + if(chunk.length != 7) return SPNG_ECHUNK_SIZE; + + struct spng_time time; + + time.year = read_u16(data); + time.month = data[2]; + time.day = data[3]; + time.hour = data[4]; + time.minute = data[5]; + time.second = data[6]; + + if(check_time(&time)) return SPNG_ETIME; + + ctx->file.time = 1; + + if(!ctx->user.time) ctx->time = time; + + ctx->stored.time = 1; + } + else if(!memcmp(chunk.type, type_offs, 4)) + { + if(ctx->state == SPNG_STATE_AFTER_IDAT) return SPNG_ECHUNK_POS; + if(ctx->file.offs) return SPNG_EDUP_OFFS; + + if(chunk.length != 9) return SPNG_ECHUNK_SIZE; + + ctx->offs.x = read_s32(data); + ctx->offs.y = read_s32(data + 4); + ctx->offs.unit_specifier = data[8]; + + if(check_offs(&ctx->offs)) return SPNG_EOFFS; + + ctx->file.offs = 1; + ctx->stored.offs = 1; + } + else /* Arbitrary-length chunk */ + { + + if(!memcmp(chunk.type, type_exif, 4)) + { + if(ctx->file.exif) return SPNG_EDUP_EXIF; + + ctx->file.exif = 1; + + if(ctx->user.exif) goto discard; + + if(increase_cache_usage(ctx, chunk.length, 1)) return SPNG_ECHUNK_LIMITS; + + struct spng_exif exif; + + exif.length = chunk.length; + + exif.data = spng__malloc(ctx, chunk.length); + if(exif.data == NULL) return SPNG_EMEM; + + ret = read_chunk_bytes2(ctx, exif.data, chunk.length); + if(ret) + { + spng__free(ctx, exif.data); + return ret; + } + + if(check_exif(&exif)) + { + spng__free(ctx, exif.data); + return SPNG_EEXIF; + } + + ctx->exif = exif; + + ctx->stored.exif = 1; + } + else if(!memcmp(chunk.type, type_iccp, 4)) + {/* TODO: add test file with color profile */ + if(ctx->file.plte) return SPNG_ECHUNK_POS; + if(ctx->state == SPNG_STATE_AFTER_IDAT) return SPNG_ECHUNK_POS; + if(ctx->file.iccp) return SPNG_EDUP_ICCP; + if(!chunk.length) return SPNG_ECHUNK_SIZE; + + ctx->file.iccp = 1; + + uint32_t peek_bytes = 81 > chunk.length ? chunk.length : 81; + + ret = read_chunk_bytes(ctx, peek_bytes); + if(ret) return ret; + + unsigned char *keyword_nul = memchr(ctx->data, '\0', peek_bytes); + if(keyword_nul == NULL) return SPNG_EICCP_NAME; + + uint32_t keyword_len = keyword_nul - ctx->data; + + if(keyword_len > 79) return SPNG_EICCP_NAME; + + memcpy(ctx->iccp.profile_name, ctx->data, keyword_len); + + if(check_png_keyword(ctx->iccp.profile_name)) return SPNG_EICCP_NAME; + + if(chunk.length < (keyword_len + 2)) return SPNG_ECHUNK_SIZE; + + if(ctx->data[keyword_len + 1] != 0) return SPNG_EICCP_COMPRESSION_METHOD; + + ret = spng__inflate_stream(ctx, &ctx->iccp.profile, &ctx->iccp.profile_len, 0, ctx->data + keyword_len + 2, peek_bytes - (keyword_len + 2)); + + if(ret) return ret; + + ctx->stored.iccp = 1; + } + else if(!memcmp(chunk.type, type_text, 4) || + !memcmp(chunk.type, type_ztxt, 4) || + !memcmp(chunk.type, type_itxt, 4)) + { + if(!chunk.length) return SPNG_ECHUNK_SIZE; + + ctx->file.text = 1; + + if(ctx->user.text) goto discard; + + if(increase_cache_usage(ctx, sizeof(struct spng_text2), 1)) return SPNG_ECHUNK_LIMITS; + + ctx->n_text++; + if(ctx->n_text < 1) return SPNG_EOVERFLOW; + if(sizeof(struct spng_text2) > SIZE_MAX / ctx->n_text) return SPNG_EOVERFLOW; + + void *buf = spng__realloc(ctx, ctx->text_list, ctx->n_text * sizeof(struct spng_text2)); + if(buf == NULL) return SPNG_EMEM; + ctx->text_list = buf; + + struct spng_text2 *text = &ctx->text_list[ctx->n_text - 1]; + memset(text, 0, sizeof(struct spng_text2)); + + ctx->undo = text_undo; + + uint32_t text_offset = 0, language_tag_offset = 0, translated_keyword_offset = 0; + uint32_t peek_bytes = 256; /* enough for 3 80-byte keywords and some text bytes */ + uint32_t keyword_len; + + if(peek_bytes > chunk.length) peek_bytes = chunk.length; + + ret = read_chunk_bytes(ctx, peek_bytes); + if(ret) return ret; + + data = ctx->data; + + const unsigned char *zlib_stream = NULL; + const unsigned char *peek_end = data + peek_bytes; + const unsigned char *keyword_nul = memchr(data, 0, chunk.length > 80 ? 80 : chunk.length); + + if(keyword_nul == NULL) return SPNG_ETEXT_KEYWORD; + + keyword_len = keyword_nul - data; + + if(!memcmp(chunk.type, type_text, 4)) + { + text->type = SPNG_TEXT; + + text->text_length = chunk.length - keyword_len - 1; + + text_offset = keyword_len; + + /* increment past nul if there is a text field */ + if(text->text_length) text_offset++; + } + else if(!memcmp(chunk.type, type_ztxt, 4)) + { + text->type = SPNG_ZTXT; + + if((peek_bytes - keyword_len) <= 2) return SPNG_EZTXT; + + if(keyword_nul[1]) return SPNG_EZTXT_COMPRESSION_METHOD; + + text->compression_flag = 1; + + text_offset = keyword_len + 2; + } + else if(!memcmp(chunk.type, type_itxt, 4)) + { + text->type = SPNG_ITXT; + + /* at least two 1-byte fields, two >=0 length strings, and one byte of (compressed) text */ + if((peek_bytes - keyword_len) < 5) return SPNG_EITXT; + + text->compression_flag = keyword_nul[1]; + + if(text->compression_flag > 1) return SPNG_EITXT_COMPRESSION_FLAG; + + if(keyword_nul[2]) return SPNG_EITXT_COMPRESSION_METHOD; + + language_tag_offset = keyword_len + 3; + + const unsigned char *term; + term = memchr(data + language_tag_offset, 0, peek_bytes - language_tag_offset); + if(term == NULL) return SPNG_EITXT_LANG_TAG; + + if((peek_end - term) < 2) return SPNG_EITXT; + + translated_keyword_offset = term - data + 1; + + zlib_stream = memchr(data + translated_keyword_offset, 0, peek_bytes - translated_keyword_offset); + if(zlib_stream == NULL) return SPNG_EITXT; + if(zlib_stream == peek_end) return SPNG_EITXT; + + text_offset = zlib_stream - data + 1; + text->text_length = chunk.length - text_offset; + } + else return SPNG_EINTERNAL; + + + if(text->compression_flag) + { + /* cache usage = peek_bytes + decompressed text size + nul */ + if(increase_cache_usage(ctx, peek_bytes, 0)) return SPNG_ECHUNK_LIMITS; + + text->keyword = spng__calloc(ctx, 1, peek_bytes); + if(text->keyword == NULL) return SPNG_EMEM; + + memcpy(text->keyword, data, peek_bytes); + + zlib_stream = ctx->data + text_offset; + + ret = spng__inflate_stream(ctx, &text->text, &text->text_length, 1, zlib_stream, peek_bytes - text_offset); + + if(ret) return ret; + + text->text[text->text_length - 1] = '\0'; + text->cache_usage = text->text_length + peek_bytes; + } + else + { + if(increase_cache_usage(ctx, chunk.length + 1, 0)) return SPNG_ECHUNK_LIMITS; + + text->keyword = spng__malloc(ctx, chunk.length + 1); + if(text->keyword == NULL) return SPNG_EMEM; + + memcpy(text->keyword, data, peek_bytes); + + if(chunk.length > peek_bytes) + { + ret = read_chunk_bytes2(ctx, text->keyword + peek_bytes, chunk.length - peek_bytes); + if(ret) return ret; + } + + text->text = text->keyword + text_offset; + + text->text_length = chunk.length - text_offset; + + text->text[text->text_length] = '\0'; + text->cache_usage = chunk.length + 1; + } + + if(check_png_keyword(text->keyword)) return SPNG_ETEXT_KEYWORD; + + text->text_length = strlen(text->text); + + if(text->type != SPNG_ITXT) + { + language_tag_offset = keyword_len; + translated_keyword_offset = keyword_len; + + if(ctx->strict && check_png_text(text->text, text->text_length)) + { + if(text->type == SPNG_ZTXT) return SPNG_EZTXT; + else return SPNG_ETEXT; + } + } + + text->language_tag = text->keyword + language_tag_offset; + text->translated_keyword = text->keyword + translated_keyword_offset; + + ctx->stored.text = 1; + } + else if(!memcmp(chunk.type, type_splt, 4)) + { + if(ctx->state == SPNG_STATE_AFTER_IDAT) return SPNG_ECHUNK_POS; + if(ctx->user.splt) goto discard; /* XXX: could check profile names for uniqueness */ + if(!chunk.length) return SPNG_ECHUNK_SIZE; + + ctx->file.splt = 1; + + /* chunk.length + sizeof(struct spng_splt) + splt->n_entries * sizeof(struct spng_splt_entry) */ + if(increase_cache_usage(ctx, chunk.length + sizeof(struct spng_splt), 1)) return SPNG_ECHUNK_LIMITS; + + ctx->n_splt++; + if(ctx->n_splt < 1) return SPNG_EOVERFLOW; + if(sizeof(struct spng_splt) > SIZE_MAX / ctx->n_splt) return SPNG_EOVERFLOW; + + void *buf = spng__realloc(ctx, ctx->splt_list, ctx->n_splt * sizeof(struct spng_splt)); + if(buf == NULL) return SPNG_EMEM; + ctx->splt_list = buf; + + struct spng_splt *splt = &ctx->splt_list[ctx->n_splt - 1]; + + memset(splt, 0, sizeof(struct spng_splt)); + + ctx->undo = splt_undo; + + void *t = spng__malloc(ctx, chunk.length); + if(t == NULL) return SPNG_EMEM; + + splt->entries = t; /* simplifies error handling */ + data = t; + + ret = read_chunk_bytes2(ctx, t, chunk.length); + if(ret) return ret; + + uint32_t keyword_len = chunk.length < 80 ? chunk.length : 80; + + const unsigned char *keyword_nul = memchr(data, 0, keyword_len); + if(keyword_nul == NULL) return SPNG_ESPLT_NAME; + + keyword_len = keyword_nul - data; + + memcpy(splt->name, data, keyword_len); + + if(check_png_keyword(splt->name)) return SPNG_ESPLT_NAME; + + uint32_t j; + for(j=0; j < (ctx->n_splt - 1); j++) + { + if(!strcmp(ctx->splt_list[j].name, splt->name)) return SPNG_ESPLT_DUP_NAME; + } + + if( (chunk.length - keyword_len) <= 2) return SPNG_ECHUNK_SIZE; + + splt->sample_depth = data[keyword_len + 1]; + + uint32_t entries_len = chunk.length - keyword_len - 2; + if(!entries_len) return SPNG_ECHUNK_SIZE; + + if(splt->sample_depth == 16) + { + if(entries_len % 10 != 0) return SPNG_ECHUNK_SIZE; + splt->n_entries = entries_len / 10; + } + else if(splt->sample_depth == 8) + { + if(entries_len % 6 != 0) return SPNG_ECHUNK_SIZE; + splt->n_entries = entries_len / 6; + } + else return SPNG_ESPLT_DEPTH; + + if(!splt->n_entries) return SPNG_ECHUNK_SIZE; + + size_t list_size = splt->n_entries; + + if(list_size > SIZE_MAX / sizeof(struct spng_splt_entry)) return SPNG_EOVERFLOW; + + list_size *= sizeof(struct spng_splt_entry); + + if(increase_cache_usage(ctx, list_size, 0)) return SPNG_ECHUNK_LIMITS; + + splt->entries = spng__malloc(ctx, list_size); + if(splt->entries == NULL) + { + spng__free(ctx, t); + return SPNG_EMEM; + } + + data = (unsigned char*)t + keyword_len + 2; + + uint32_t k; + if(splt->sample_depth == 16) + { + for(k=0; k < splt->n_entries; k++) + { + splt->entries[k].red = read_u16(data + k * 10); + splt->entries[k].green = read_u16(data + k * 10 + 2); + splt->entries[k].blue = read_u16(data + k * 10 + 4); + splt->entries[k].alpha = read_u16(data + k * 10 + 6); + splt->entries[k].frequency = read_u16(data + k * 10 + 8); + } + } + else if(splt->sample_depth == 8) + { + for(k=0; k < splt->n_entries; k++) + { + splt->entries[k].red = data[k * 6]; + splt->entries[k].green = data[k * 6 + 1]; + splt->entries[k].blue = data[k * 6 + 2]; + splt->entries[k].alpha = data[k * 6 + 3]; + splt->entries[k].frequency = read_u16(data + k * 6 + 4); + } + } + + spng__free(ctx, t); + decrease_cache_usage(ctx, chunk.length); + + ctx->stored.splt = 1; + } + else /* Unknown chunk */ + { + ctx->file.unknown = 1; + + if(!ctx->keep_unknown) goto discard; + if(ctx->user.unknown) goto discard; + + if(increase_cache_usage(ctx, chunk.length + sizeof(struct spng_unknown_chunk), 1)) return SPNG_ECHUNK_LIMITS; + + ctx->n_chunks++; + if(ctx->n_chunks < 1) return SPNG_EOVERFLOW; + if(sizeof(struct spng_unknown_chunk) > SIZE_MAX / ctx->n_chunks) return SPNG_EOVERFLOW; + + void *buf = spng__realloc(ctx, ctx->chunk_list, ctx->n_chunks * sizeof(struct spng_unknown_chunk)); + if(buf == NULL) return SPNG_EMEM; + ctx->chunk_list = buf; + + struct spng_unknown_chunk *chunkp = &ctx->chunk_list[ctx->n_chunks - 1]; + + memset(chunkp, 0, sizeof(struct spng_unknown_chunk)); + + ctx->undo = chunk_undo; + + memcpy(chunkp->type, chunk.type, 4); + + if(ctx->state < SPNG_STATE_FIRST_IDAT) + { + if(ctx->file.plte) chunkp->location = SPNG_AFTER_PLTE; + else chunkp->location = SPNG_AFTER_IHDR; + } + else if(ctx->state >= SPNG_STATE_AFTER_IDAT) chunkp->location = SPNG_AFTER_IDAT; + + if(chunk.length > 0) + { + void *t = spng__malloc(ctx, chunk.length); + if(t == NULL) return SPNG_EMEM; + + ret = read_chunk_bytes2(ctx, t, chunk.length); + if(ret) + { + spng__free(ctx, t); + return ret; + } + + chunkp->length = chunk.length; + chunkp->data = t; + } + + ctx->stored.unknown = 1; + } + +discard: + ret = discard_chunk_bytes(ctx, ctx->cur_chunk_bytes_left); + if(ret) return ret; + } + + } + + return ret; +} + +/* Read chunks before or after the IDAT chunks depending on state */ +static int read_chunks(spng_ctx *ctx, int only_ihdr) +{ + if(ctx == NULL) return SPNG_EINTERNAL; + if(!ctx->state) return SPNG_EBADSTATE; + if(ctx->data == NULL) + { + if(ctx->encode_only) return 0; + else return SPNG_EINTERNAL; + } + + int ret = 0; + + if(ctx->state == SPNG_STATE_INPUT) + { + ret = read_ihdr(ctx); + + if(ret) return decode_err(ctx, ret); + + ctx->state = SPNG_STATE_IHDR; + } + + if(only_ihdr) return 0; + + if(ctx->state == SPNG_STATE_EOI) + { + ctx->state = SPNG_STATE_AFTER_IDAT; + ctx->prev_was_idat = 1; + } + + while(ctx->state < SPNG_STATE_FIRST_IDAT || ctx->state == SPNG_STATE_AFTER_IDAT) + { + ret = read_non_idat_chunks(ctx); + + if(!ret) + { + if(ctx->state < SPNG_STATE_FIRST_IDAT) ctx->state = SPNG_STATE_FIRST_IDAT; + else if(ctx->state == SPNG_STATE_AFTER_IDAT) ctx->state = SPNG_STATE_IEND; + } + else + { + switch(ret) + { + case SPNG_ECHUNK_POS: + case SPNG_ECHUNK_SIZE: /* size != expected size, SPNG_ECHUNK_STDLEN = invalid size */ + case SPNG_EDUP_PLTE: + case SPNG_EDUP_CHRM: + case SPNG_EDUP_GAMA: + case SPNG_EDUP_ICCP: + case SPNG_EDUP_SBIT: + case SPNG_EDUP_SRGB: + case SPNG_EDUP_BKGD: + case SPNG_EDUP_HIST: + case SPNG_EDUP_TRNS: + case SPNG_EDUP_PHYS: + case SPNG_EDUP_TIME: + case SPNG_EDUP_OFFS: + case SPNG_EDUP_EXIF: + case SPNG_ECHRM: + case SPNG_ETRNS_COLOR_TYPE: + case SPNG_ETRNS_NO_PLTE: + case SPNG_EGAMA: + case SPNG_EICCP_NAME: + case SPNG_EICCP_COMPRESSION_METHOD: + case SPNG_ESBIT: + case SPNG_ESRGB: + case SPNG_ETEXT: + case SPNG_ETEXT_KEYWORD: + case SPNG_EZTXT: + case SPNG_EZTXT_COMPRESSION_METHOD: + case SPNG_EITXT: + case SPNG_EITXT_COMPRESSION_FLAG: + case SPNG_EITXT_COMPRESSION_METHOD: + case SPNG_EITXT_LANG_TAG: + case SPNG_EITXT_TRANSLATED_KEY: + case SPNG_EBKGD_NO_PLTE: + case SPNG_EBKGD_PLTE_IDX: + case SPNG_EHIST_NO_PLTE: + case SPNG_EPHYS: + case SPNG_ESPLT_NAME: + case SPNG_ESPLT_DUP_NAME: + case SPNG_ESPLT_DEPTH: + case SPNG_ETIME: + case SPNG_EOFFS: + case SPNG_EEXIF: + case SPNG_EZLIB: + { + if(!ctx->strict && !is_critical_chunk(&ctx->current_chunk)) + { + ret = discard_chunk_bytes(ctx, ctx->cur_chunk_bytes_left); + if(ret) return decode_err(ctx, ret); + + if(ctx->undo) ctx->undo(ctx); + + ctx->stored = ctx->prev_stored; + + ctx->discard = 0; + ctx->undo = NULL; + + continue; + } + else return decode_err(ctx, ret); + + break; + } + default: return decode_err(ctx, ret); + } + } + } + + return ret; +} + +static int read_scanline(spng_ctx *ctx) +{ + int ret, pass = ctx->row_info.pass; + struct spng_row_info *ri = &ctx->row_info; + const struct spng_subimage *sub = ctx->subimage; + size_t scanline_width = sub[pass].scanline_width; + uint32_t scanline_idx = ri->scanline_idx; + + uint8_t next_filter = 0; + + if(scanline_idx == (sub[pass].height - 1) && ri->pass == ctx->last_pass) + { + ret = read_scanline_bytes(ctx, ctx->scanline, scanline_width - 1); + } + else + { + ret = read_scanline_bytes(ctx, ctx->scanline, scanline_width); + if(ret) return ret; + + next_filter = ctx->scanline[scanline_width - 1]; + if(next_filter > 4) ret = SPNG_EFILTER; + } + + if(ret) return ret; + + if(!scanline_idx && ri->filter > 1) + { + /* prev_scanline is all zeros for the first scanline */ + memset(ctx->prev_scanline, 0, scanline_width); + } + + if(ctx->ihdr.bit_depth == 16 && ctx->fmt != SPNG_FMT_RAW) u16_row_to_host(ctx->scanline, scanline_width - 1); + + ret = defilter_scanline(ctx->prev_scanline, ctx->scanline, scanline_width, ctx->bytes_per_pixel, ri->filter); + if(ret) return ret; + + ri->filter = next_filter; + + return 0; +} + +static int update_row_info(spng_ctx *ctx) +{ + int interlacing = ctx->ihdr.interlace_method; + struct spng_row_info *ri = &ctx->row_info; + const struct spng_subimage *sub = ctx->subimage; + + if(ri->scanline_idx == (sub[ri->pass].height - 1)) /* Last scanline */ + { + if(ri->pass == ctx->last_pass) + { + ctx->state = SPNG_STATE_EOI; + + return SPNG_EOI; + } + + ri->scanline_idx = 0; + ri->pass++; + + /* Skip empty passes */ + while( (!sub[ri->pass].width || !sub[ri->pass].height) && (ri->pass < ctx->last_pass)) ri->pass++; + } + else + { + ri->row_num++; + ri->scanline_idx++; + } + + if(interlacing) ri->row_num = adam7_y_start[ri->pass] + ri->scanline_idx * adam7_y_delta[ri->pass]; + + return 0; +} + +int spng_decode_scanline(spng_ctx *ctx, void *out, size_t len) +{ + if(ctx == NULL || out == NULL) return 1; + + if(ctx->state >= SPNG_STATE_EOI) return SPNG_EOI; + + struct decode_flags f = ctx->decode_flags; + + struct spng_row_info *ri = &ctx->row_info; + const struct spng_subimage *sub = ctx->subimage; + + const struct spng_ihdr *ihdr = &ctx->ihdr; + const uint16_t *gamma_lut = ctx->gamma_lut; + unsigned char *trns_px = ctx->trns_px; + const struct spng_sbit *sb = &ctx->decode_sb; + const struct spng_plte_entry *plte = ctx->decode_plte.rgba; + struct spng__iter iter = spng__iter_init(ihdr->bit_depth, ctx->scanline); + + const unsigned char *scanline; + + const int pass = ri->pass; + const int fmt = ctx->fmt; + const size_t scanline_width = sub[pass].scanline_width; + const uint32_t width = sub[pass].width; + uint32_t k; + uint8_t r_8, g_8, b_8, a_8, gray_8; + uint16_t r_16, g_16, b_16, a_16, gray_16; + r_8=0; g_8=0; b_8=0; a_8=0; gray_8=0; + r_16=0; g_16=0; b_16=0; a_16=0; gray_16=0; + size_t pixel_size = 4; /* SPNG_FMT_RGBA8 */ + size_t pixel_offset = 0; + unsigned char *pixel; + unsigned processing_depth = ihdr->bit_depth; + + if(f.indexed) processing_depth = 8; + + if(fmt == SPNG_FMT_RGBA16) pixel_size = 8; + else if(fmt == SPNG_FMT_RGB8) pixel_size = 3; + + if(len < sub[pass].out_width) return SPNG_EBUFSIZ; + + int ret = read_scanline(ctx); + + if(ret) return decode_err(ctx, ret); + + scanline = ctx->scanline; + + for(k=0; k < width; k++) + { + pixel = (unsigned char*)out + pixel_offset; + pixel_offset += pixel_size; + + if(f.same_layout) + { + if(f.zerocopy) break; + + memcpy(out, scanline, scanline_width - 1); + break; + } + + if(f.unpack) + { + unpack_scanline(out, scanline, width, ihdr->bit_depth, fmt); + break; + } + + if(ihdr->color_type == SPNG_COLOR_TYPE_TRUECOLOR) + { + if(ihdr->bit_depth == 16) + { + memcpy(&r_16, scanline + (k * 6), 2); + memcpy(&g_16, scanline + (k * 6) + 2, 2); + memcpy(&b_16, scanline + (k * 6) + 4, 2); + + a_16 = 65535; + } + else /* == 8 */ + { + if(fmt == SPNG_FMT_RGBA8) + { + rgb8_row_to_rgba8(scanline, out, width); + break; + } + + r_8 = scanline[k * 3]; + g_8 = scanline[k * 3 + 1]; + b_8 = scanline[k * 3 + 2]; + + a_8 = 255; + } + } + else if(ihdr->color_type == SPNG_COLOR_TYPE_INDEXED) + { + uint8_t entry = 0; + + if(ihdr->bit_depth == 8) + { + if(fmt & (SPNG_FMT_RGBA8 | SPNG_FMT_RGB8)) + { + expand_row(out, scanline, &ctx->decode_plte, width, fmt); + break; + } + + entry = scanline[k]; + } + else /* < 8 */ + { + entry = get_sample(&iter); + } + + if(fmt & (SPNG_FMT_RGBA8 | SPNG_FMT_RGB8)) + { + pixel[0] = plte[entry].red; + pixel[1] = plte[entry].green; + pixel[2] = plte[entry].blue; + if(fmt == SPNG_FMT_RGBA8) pixel[3] = plte[entry].alpha; + + continue; + } + else /* RGBA16 */ + { + r_16 = plte[entry].red; + g_16 = plte[entry].green; + b_16 = plte[entry].blue; + a_16 = plte[entry].alpha; + + r_16 = (r_16 << 8) | r_16; + g_16 = (g_16 << 8) | g_16; + b_16 = (b_16 << 8) | b_16; + a_16 = (a_16 << 8) | a_16; + + memcpy(pixel, &r_16, 2); + memcpy(pixel + 2, &g_16, 2); + memcpy(pixel + 4, &b_16, 2); + memcpy(pixel + 6, &a_16, 2); + + continue; + } + } + else if(ihdr->color_type == SPNG_COLOR_TYPE_TRUECOLOR_ALPHA) + { + if(ihdr->bit_depth == 16) + { + memcpy(&r_16, scanline + (k * 8), 2); + memcpy(&g_16, scanline + (k * 8) + 2, 2); + memcpy(&b_16, scanline + (k * 8) + 4, 2); + memcpy(&a_16, scanline + (k * 8) + 6, 2); + } + else /* == 8 */ + { + r_8 = scanline[k * 4]; + g_8 = scanline[k * 4 + 1]; + b_8 = scanline[k * 4 + 2]; + a_8 = scanline[k * 4 + 3]; + } + } + else if(ihdr->color_type == SPNG_COLOR_TYPE_GRAYSCALE) + { + if(ihdr->bit_depth == 16) + { + memcpy(&gray_16, scanline + k * 2, 2); + + if(f.apply_trns && ctx->trns.gray == gray_16) a_16 = 0; + else a_16 = 65535; + + r_16 = gray_16; + g_16 = gray_16; + b_16 = gray_16; + } + else /* <= 8 */ + { + gray_8 = get_sample(&iter); + + if(f.apply_trns && ctx->trns.gray == gray_8) a_8 = 0; + else a_8 = 255; + + r_8 = gray_8; g_8 = gray_8; b_8 = gray_8; + } + } + else if(ihdr->color_type == SPNG_COLOR_TYPE_GRAYSCALE_ALPHA) + { + if(ihdr->bit_depth == 16) + { + memcpy(&gray_16, scanline + (k * 4), 2); + memcpy(&a_16, scanline + (k * 4) + 2, 2); + + r_16 = gray_16; + g_16 = gray_16; + b_16 = gray_16; + } + else /* == 8 */ + { + gray_8 = scanline[k * 2]; + a_8 = scanline[k * 2 + 1]; + + r_8 = gray_8; + g_8 = gray_8; + b_8 = gray_8; + } + } + + + if(fmt & (SPNG_FMT_RGBA8 | SPNG_FMT_RGB8)) + { + if(ihdr->bit_depth == 16) + { + r_8 = r_16 >> 8; + g_8 = g_16 >> 8; + b_8 = b_16 >> 8; + a_8 = a_16 >> 8; + } + + pixel[0] = r_8; + pixel[1] = g_8; + pixel[2] = b_8; + + if(fmt == SPNG_FMT_RGBA8) pixel[3] = a_8; + } + else if(fmt == SPNG_FMT_RGBA16) + { + if(ihdr->bit_depth != 16) + { + r_16 = r_8; + g_16 = g_8; + b_16 = b_8; + a_16 = a_8; + } + + memcpy(pixel, &r_16, 2); + memcpy(pixel + 2, &g_16, 2); + memcpy(pixel + 4, &b_16, 2); + memcpy(pixel + 6, &a_16, 2); + } + }/* for(k=0; k < width; k++) */ + + if(f.apply_trns) trns_row(out, scanline, trns_px, ctx->bytes_per_pixel, &ctx->ihdr, width, fmt); + + if(f.do_scaling) scale_row(out, width, fmt, processing_depth, sb); + + if(f.apply_gamma) gamma_correct_row(out, width, fmt, gamma_lut); + + /* The previous scanline is always defiltered */ + void *t = ctx->prev_scanline; + ctx->prev_scanline = ctx->scanline; + ctx->scanline = t; + + ret = update_row_info(ctx); + + if(ret == SPNG_EOI) + { + if(ctx->cur_chunk_bytes_left) /* zlib stream ended before an IDAT chunk boundary */ + {/* Discard the rest of the chunk */ + int error = discard_chunk_bytes(ctx, ctx->cur_chunk_bytes_left); + if(error) return decode_err(ctx, error); + } + + ctx->last_idat = ctx->current_chunk; + } + + return ret; +} + +int spng_decode_row(spng_ctx *ctx, void *out, size_t len) +{ + if(ctx == NULL || out == NULL) return 1; + if(ctx->state >= SPNG_STATE_EOI) return SPNG_EOI; + if(len < ctx->image_width) return SPNG_EBUFSIZ; + + const struct spng_ihdr *ihdr = &ctx->ihdr; + int ret, pass = ctx->row_info.pass; + unsigned char *outptr = out; + + if(!ihdr->interlace_method || pass == 6) return spng_decode_scanline(ctx, out, len); + + ret = spng_decode_scanline(ctx, ctx->row, ctx->image_width); + if(ret && ret != SPNG_EOI) return ret; + + uint32_t k; + unsigned pixel_size = 4; /* RGBA8 */ + if(ctx->fmt == SPNG_FMT_RGBA16) pixel_size = 8; + else if(ctx->fmt == SPNG_FMT_RGB8) pixel_size = 3; + else if(ctx->fmt == SPNG_FMT_G8) pixel_size = 1; + else if(ctx->fmt == SPNG_FMT_GA8) pixel_size = 2; + else if(ctx->fmt & (SPNG_FMT_PNG | SPNG_FMT_RAW)) + { + if(ihdr->bit_depth < 8) + { + struct spng__iter iter = spng__iter_init(ihdr->bit_depth, ctx->row); + const uint8_t samples_per_byte = 8 / ihdr->bit_depth; + uint8_t sample; + + for(k=0; k < ctx->subimage[pass].width; k++) + { + sample = get_sample(&iter); + + size_t ioffset = adam7_x_start[pass] + k * adam7_x_delta[pass]; + + sample = sample << (iter.initial_shift - ioffset * ihdr->bit_depth % 8); + + ioffset /= samples_per_byte; + + outptr[ioffset] |= sample; + } + + return 0; + } + else pixel_size = ctx->bytes_per_pixel; + } + + for(k=0; k < ctx->subimage[pass].width; k++) + { + size_t ioffset = (adam7_x_start[pass] + (size_t) k * adam7_x_delta[pass]) * pixel_size; + + memcpy(outptr + ioffset, ctx->row + k * pixel_size, pixel_size); + } + + return 0; +} + +int spng_decode_chunks(spng_ctx *ctx) +{ + if(ctx == NULL) return 1; + if(ctx->encode_only) return SPNG_ECTXTYPE; + if(ctx->state < SPNG_STATE_INPUT) return SPNG_ENOSRC; + if(ctx->state == SPNG_STATE_IEND) return 0; + + return read_chunks(ctx, 0); +} + +int spng_decode_image(spng_ctx *ctx, void *out, size_t len, int fmt, int flags) +{ + if(ctx == NULL) return 1; + if(ctx->encode_only) return SPNG_ECTXTYPE; + if(ctx->state >= SPNG_STATE_EOI) return SPNG_EOI; + + const struct spng_ihdr *ihdr = &ctx->ihdr; + + int ret = read_chunks(ctx, 0); + if(ret) return decode_err(ctx, ret); + + ret = check_decode_fmt(ihdr, fmt); + if(ret) return ret; + + ret = calculate_image_width(ihdr, fmt, &ctx->image_width); + if(ret) return decode_err(ctx, ret); + + if(ctx->image_width > SIZE_MAX / ihdr->height) ctx->image_size = 0; /* overflow */ + else ctx->image_size = ctx->image_width * ihdr->height; + + if( !(flags & SPNG_DECODE_PROGRESSIVE) ) + { + if(out == NULL) return 1; + if(!ctx->image_size) return SPNG_EOVERFLOW; + if(len < ctx->image_size) return SPNG_EBUFSIZ; + } + + uint32_t bytes_read = 0; + + ret = read_idat_bytes(ctx, &bytes_read); + if(ret) return decode_err(ctx, ret); + + if(bytes_read > 1) + { + int valid = read_u16(ctx->data) % 31 ? 0 : 1; + + unsigned flg = ctx->data[1]; + unsigned flevel = flg >> 6; + int compression_level = Z_DEFAULT_COMPRESSION; + + if(flevel == 0) compression_level = 0; /* fastest */ + else if(flevel == 1) compression_level = 1; /* fast */ + else if(flevel == 2) compression_level = 6; /* default */ + else if(flevel == 3) compression_level = 9; /* slowest, max compression */ + + if(valid) ctx->image_options.compression_level = compression_level; + } + + ret = spng__inflate_init(ctx, ctx->image_options.window_bits); + if(ret) return decode_err(ctx, ret); + + ctx->zstream.avail_in = bytes_read; + ctx->zstream.next_in = ctx->data; + + size_t scanline_buf_size = ctx->subimage[ctx->widest_pass].scanline_width; + + scanline_buf_size += 32; + + if(scanline_buf_size < 32) return SPNG_EOVERFLOW; + + ctx->scanline_buf = spng__malloc(ctx, scanline_buf_size); + ctx->prev_scanline_buf = spng__malloc(ctx, scanline_buf_size); + + ctx->scanline = ctx->scanline_buf; + ctx->prev_scanline = ctx->prev_scanline_buf; + + struct decode_flags f = {0}; + + ctx->fmt = fmt; + + if(ihdr->color_type == SPNG_COLOR_TYPE_INDEXED) f.indexed = 1; + + unsigned processing_depth = ihdr->bit_depth; + + if(f.indexed) processing_depth = 8; + + if(ihdr->interlace_method) + { + f.interlaced = 1; + ctx->row_buf = spng__malloc(ctx, ctx->image_width); + ctx->row = ctx->row_buf; + + if(ctx->row == NULL) return decode_err(ctx, SPNG_EMEM); + } + + if(ctx->scanline == NULL || ctx->prev_scanline == NULL) + { + return decode_err(ctx, SPNG_EMEM); + } + + f.do_scaling = 1; + if(f.indexed) f.do_scaling = 0; + + unsigned depth_target = 8; /* FMT_RGBA8, G8 */ + if(fmt == SPNG_FMT_RGBA16) depth_target = 16; + + if(flags & SPNG_DECODE_TRNS && ctx->stored.trns) f.apply_trns = 1; + else flags &= ~SPNG_DECODE_TRNS; + + if(ihdr->color_type == SPNG_COLOR_TYPE_GRAYSCALE_ALPHA || + ihdr->color_type == SPNG_COLOR_TYPE_TRUECOLOR_ALPHA) flags &= ~SPNG_DECODE_TRNS; + + if(flags & SPNG_DECODE_GAMMA && ctx->stored.gama) f.apply_gamma = 1; + else flags &= ~SPNG_DECODE_GAMMA; + + if(flags & SPNG_DECODE_USE_SBIT && ctx->stored.sbit) f.use_sbit = 1; + else flags &= ~SPNG_DECODE_USE_SBIT; + + if(fmt & (SPNG_FMT_RGBA8 | SPNG_FMT_RGBA16)) + { + if(ihdr->color_type == SPNG_COLOR_TYPE_TRUECOLOR_ALPHA && + ihdr->bit_depth == depth_target) f.same_layout = 1; + } + else if(fmt == SPNG_FMT_RGB8) + { + if(ihdr->color_type == SPNG_COLOR_TYPE_TRUECOLOR && + ihdr->bit_depth == depth_target) f.same_layout = 1; + + f.apply_trns = 0; /* not applicable */ + } + else if(fmt & (SPNG_FMT_PNG | SPNG_FMT_RAW)) + { + f.same_layout = 1; + f.do_scaling = 0; + f.apply_gamma = 0; /* for now */ + f.apply_trns = 0; + } + else if(fmt == SPNG_FMT_G8 && ihdr->color_type == SPNG_COLOR_TYPE_GRAYSCALE && ihdr->bit_depth <= 8) + { + if(ihdr->bit_depth == depth_target) f.same_layout = 1; + else if(ihdr->bit_depth < 8) f.unpack = 1; + + f.apply_trns = 0; + } + else if(fmt == SPNG_FMT_GA8 && ihdr->color_type == SPNG_COLOR_TYPE_GRAYSCALE && ihdr->bit_depth <= 8) + { + if(ihdr->color_type == SPNG_COLOR_TYPE_GRAYSCALE_ALPHA && + ihdr->bit_depth == depth_target) f.same_layout = 1; + else if(ihdr->bit_depth <= 8) f.unpack = 1; + } + else if(fmt == SPNG_FMT_GA16 && ihdr->color_type == SPNG_COLOR_TYPE_GRAYSCALE && ihdr->bit_depth == 16) + { + if(ihdr->color_type == SPNG_COLOR_TYPE_GRAYSCALE_ALPHA && + ihdr->bit_depth == depth_target) f.same_layout = 1; + else if(ihdr->bit_depth == 16) f.unpack = 1; + } + + /*if(f.same_layout && !flags && !f.interlaced) f.zerocopy = 1;*/ + + uint16_t *gamma_lut = NULL; + + if(f.apply_gamma) + { + float file_gamma = (float)ctx->gama / 100000.0f; + float max; + + unsigned lut_entries; + + if(fmt & (SPNG_FMT_RGBA8 | SPNG_FMT_RGB8)) + { + lut_entries = 256; + max = 255.0f; + + gamma_lut = ctx->gamma_lut8; + ctx->gamma_lut = ctx->gamma_lut8; + } + else /* SPNG_FMT_RGBA16 */ + { + lut_entries = 65536; + max = 65535.0f; + + ctx->gamma_lut16 = spng__malloc(ctx, lut_entries * sizeof(uint16_t)); + if(ctx->gamma_lut16 == NULL) return decode_err(ctx, SPNG_EMEM); + + gamma_lut = ctx->gamma_lut16; + ctx->gamma_lut = ctx->gamma_lut16; + } + + float screen_gamma = 2.2f; + float exponent = file_gamma * screen_gamma; + + if(FP_ZERO == fpclassify(exponent)) return decode_err(ctx, SPNG_EGAMA); + + exponent = 1.0f / exponent; + + unsigned i; + for(i=0; i < lut_entries; i++) + { + float c = pow((float)i / max, exponent) * max; + if(c > max) c = max; + + gamma_lut[i] = (uint16_t)c; + } + } + + struct spng_sbit *sb = &ctx->decode_sb; + + sb->red_bits = processing_depth; + sb->green_bits = processing_depth; + sb->blue_bits = processing_depth; + sb->alpha_bits = processing_depth; + sb->grayscale_bits = processing_depth; + + if(f.use_sbit) + { + if(ihdr->color_type == 0) + { + sb->grayscale_bits = ctx->sbit.grayscale_bits; + sb->alpha_bits = ihdr->bit_depth; + } + else if(ihdr->color_type == 2 || ihdr->color_type == 3) + { + sb->red_bits = ctx->sbit.red_bits; + sb->green_bits = ctx->sbit.green_bits; + sb->blue_bits = ctx->sbit.blue_bits; + sb->alpha_bits = ihdr->bit_depth; + } + else if(ihdr->color_type == 4) + { + sb->grayscale_bits = ctx->sbit.grayscale_bits; + sb->alpha_bits = ctx->sbit.alpha_bits; + } + else /* == 6 */ + { + sb->red_bits = ctx->sbit.red_bits; + sb->green_bits = ctx->sbit.green_bits; + sb->blue_bits = ctx->sbit.blue_bits; + sb->alpha_bits = ctx->sbit.alpha_bits; + } + } + + if(ihdr->bit_depth == 16 && fmt & (SPNG_FMT_RGBA8 | SPNG_FMT_RGB8)) + {/* samples are scaled down by 8 bits in the decode loop */ + sb->red_bits -= 8; + sb->green_bits -= 8; + sb->blue_bits -= 8; + sb->alpha_bits -= 8; + sb->grayscale_bits -= 8; + + processing_depth = 8; + } + + /* Prevent infinite loops in sample_to_target() */ + if(!depth_target || depth_target > 16 || + !processing_depth || processing_depth > 16 || + !sb->grayscale_bits || sb->grayscale_bits > processing_depth || + !sb->alpha_bits || sb->alpha_bits > processing_depth || + !sb->red_bits || sb->red_bits > processing_depth || + !sb->green_bits || sb->green_bits > processing_depth || + !sb->blue_bits || sb->blue_bits > processing_depth) + { + return decode_err(ctx, SPNG_ESBIT); + } + + if(sb->red_bits == sb->green_bits && + sb->green_bits == sb->blue_bits && + sb->blue_bits == sb->alpha_bits && + sb->alpha_bits == processing_depth && + processing_depth == depth_target) f.do_scaling = 0; + + struct spng_plte_entry *plte = ctx->decode_plte.rgba; + + /* Pre-process palette entries */ + if(f.indexed) + { + uint8_t red, green, blue, alpha; + + uint32_t i; + for(i=0; i < 256; i++) + { + if(f.apply_trns && i < ctx->trns.n_type3_entries) + ctx->plte.entries[i].alpha = ctx->trns.type3_alpha[i]; + else + ctx->plte.entries[i].alpha = 255; + + red = sample_to_target(ctx->plte.entries[i].red, 8, sb->red_bits, 8); + green = sample_to_target(ctx->plte.entries[i].green, 8, sb->green_bits, 8); + blue = sample_to_target(ctx->plte.entries[i].blue, 8, sb->blue_bits, 8); + alpha = sample_to_target(ctx->plte.entries[i].alpha, 8, sb->alpha_bits, 8); + +#if defined(SPNG_ARM) + if(fmt == SPNG_FMT_RGB8 && ihdr->bit_depth == 8) + {/* Working with 3 bytes at a time is more of an ARM thing */ + ctx->decode_plte.rgb[i * 3 + 0] = red; + ctx->decode_plte.rgb[i * 3 + 1] = green; + ctx->decode_plte.rgb[i * 3 + 2] = blue; + continue; + } +#endif + plte[i].red = red; + plte[i].green = green; + plte[i].blue = blue; + plte[i].alpha = alpha; + } + + f.apply_trns = 0; + } + + unsigned char *trns_px = ctx->trns_px; + + if(f.apply_trns) + { + uint16_t mask = ~0; + if(ctx->ihdr.bit_depth < 16) mask = (1 << ctx->ihdr.bit_depth) - 1; + + if(fmt & (SPNG_FMT_RGBA8 | SPNG_FMT_RGBA16)) + { + if(ihdr->color_type == SPNG_COLOR_TYPE_TRUECOLOR) + { + if(ihdr->bit_depth == 16) + { + memcpy(trns_px, &ctx->trns.red, 2); + memcpy(trns_px + 2, &ctx->trns.green, 2); + memcpy(trns_px + 4, &ctx->trns.blue, 2); + } + else + { + trns_px[0] = ctx->trns.red & mask; + trns_px[1] = ctx->trns.green & mask; + trns_px[2] = ctx->trns.blue & mask; + } + } + } + else if(ihdr->color_type == SPNG_COLOR_TYPE_GRAYSCALE) // fmt == SPNG_FMT_GA8 && + { + if(ihdr->bit_depth == 16) + { + memcpy(trns_px, &ctx->trns.gray, 2); + } + else + { + trns_px[0] = ctx->trns.gray & mask; + } + } + } + + ctx->decode_flags = f; + + ctx->state = SPNG_STATE_DECODE_INIT; + + struct spng_row_info *ri = &ctx->row_info; + struct spng_subimage *sub = ctx->subimage; + + while(!sub[ri->pass].width || !sub[ri->pass].height) ri->pass++; + + if(f.interlaced) ri->row_num = adam7_y_start[ri->pass]; + + unsigned pixel_size = 4; /* SPNG_FMT_RGBA8 */ + + if(fmt == SPNG_FMT_RGBA16) pixel_size = 8; + else if(fmt == SPNG_FMT_RGB8) pixel_size = 3; + else if(fmt == SPNG_FMT_G8) pixel_size = 1; + else if(fmt == SPNG_FMT_GA8) pixel_size = 2; + + int i; + for(i=ri->pass; i <= ctx->last_pass; i++) + { + if(!sub[i].scanline_width) continue; + + if(fmt & (SPNG_FMT_PNG | SPNG_FMT_RAW)) sub[i].out_width = sub[i].scanline_width - 1; + else sub[i].out_width = (size_t)sub[i].width * pixel_size; + + if(sub[i].out_width > UINT32_MAX) return decode_err(ctx, SPNG_EOVERFLOW); + } + + /* Read the first filter byte, offsetting all reads by 1 byte. + The scanlines will be aligned with the start of the array with + the next scanline's filter byte at the end, + the last scanline will end up being 1 byte "shorter". */ + ret = read_scanline_bytes(ctx, &ri->filter, 1); + if(ret) return decode_err(ctx, ret); + + if(ri->filter > 4) return decode_err(ctx, SPNG_EFILTER); + + if(flags & SPNG_DECODE_PROGRESSIVE) + { + return 0; + } + + do + { + size_t ioffset = ri->row_num * ctx->image_width; + + ret = spng_decode_row(ctx, (unsigned char*)out + ioffset, ctx->image_width); + }while(!ret); + + if(ret != SPNG_EOI) return decode_err(ctx, ret); + + return 0; +} + +int spng_get_row_info(spng_ctx *ctx, struct spng_row_info *row_info) +{ + if(ctx == NULL || row_info == NULL || ctx->state < SPNG_STATE_DECODE_INIT) return 1; + + if(ctx->state >= SPNG_STATE_EOI) return SPNG_EOI; + + *row_info = ctx->row_info; + + return 0; +} + +static int write_chunks_before_idat(spng_ctx *ctx) +{ + if(ctx == NULL) return SPNG_EINTERNAL; + if(!ctx->encode_only) return SPNG_EINTERNAL; + if(!ctx->stored.ihdr) return SPNG_EINTERNAL; + + int ret; + uint32_t i; + size_t length; + const struct spng_ihdr *ihdr = &ctx->ihdr; + unsigned char *data = ctx->decode_plte.raw; + + ret = write_data(ctx, spng_signature, 8); + if(ret) return ret; + + write_u32(data, ihdr->width); + write_u32(data + 4, ihdr->height); + data[8] = ihdr->bit_depth; + data[9] = ihdr->color_type; + data[10] = ihdr->compression_method; + data[11] = ihdr->filter_method; + data[12] = ihdr->interlace_method; + + ret = write_chunk(ctx, type_ihdr, data, 13); + if(ret) return ret; + + if(ctx->stored.chrm) + { + write_u32(data, ctx->chrm_int.white_point_x); + write_u32(data + 4, ctx->chrm_int.white_point_y); + write_u32(data + 8, ctx->chrm_int.red_x); + write_u32(data + 12, ctx->chrm_int.red_y); + write_u32(data + 16, ctx->chrm_int.green_x); + write_u32(data + 20, ctx->chrm_int.green_y); + write_u32(data + 24, ctx->chrm_int.blue_x); + write_u32(data + 28, ctx->chrm_int.blue_y); + + ret = write_chunk(ctx, type_chrm, data, 32); + if(ret) return ret; + } + + if(ctx->stored.gama) + { + write_u32(data, ctx->gama); + + ret = write_chunk(ctx, type_gama, data, 4); + if(ret) return ret; + } + + if(ctx->stored.iccp) + { + uLongf dest_len = compressBound((uLong)ctx->iccp.profile_len); + + Bytef *buf = spng__malloc(ctx, dest_len); + if(buf == NULL) return SPNG_EMEM; + + ret = compress2(buf, &dest_len, (void*)ctx->iccp.profile, (uLong)ctx->iccp.profile_len, Z_DEFAULT_COMPRESSION); + + if(ret != Z_OK) + { + spng__free(ctx, buf); + return SPNG_EZLIB; + } + + size_t name_len = strlen(ctx->iccp.profile_name); + + length = name_len + 2; + length += dest_len; + + if(dest_len > length) return SPNG_EOVERFLOW; + + unsigned char *cdata = NULL; + + ret = write_header(ctx, type_iccp, length, &cdata); + + if(ret) + { + spng__free(ctx, buf); + return ret; + } + + memcpy(cdata, ctx->iccp.profile_name, name_len + 1); + cdata[name_len + 1] = 0; /* compression method */ + memcpy(cdata + name_len + 2, buf, dest_len); + + spng__free(ctx, buf); + + ret = finish_chunk(ctx); + if(ret) return ret; + } + + if(ctx->stored.sbit) + { + switch(ctx->ihdr.color_type) + { + case SPNG_COLOR_TYPE_GRAYSCALE: + { + length = 1; + + data[0] = ctx->sbit.grayscale_bits; + + break; + } + case SPNG_COLOR_TYPE_TRUECOLOR: + case SPNG_COLOR_TYPE_INDEXED: + { + length = 3; + + data[0] = ctx->sbit.red_bits; + data[1] = ctx->sbit.green_bits; + data[2] = ctx->sbit.blue_bits; + + break; + } + case SPNG_COLOR_TYPE_GRAYSCALE_ALPHA: + { + length = 2; + + data[0] = ctx->sbit.grayscale_bits; + data[1] = ctx->sbit.alpha_bits; + + break; + } + case SPNG_COLOR_TYPE_TRUECOLOR_ALPHA: + { + length = 4; + + data[0] = ctx->sbit.red_bits; + data[1] = ctx->sbit.green_bits; + data[2] = ctx->sbit.blue_bits; + data[3] = ctx->sbit.alpha_bits; + + break; + } + default: return SPNG_EINTERNAL; + } + + ret = write_chunk(ctx, type_sbit, data, length); + if(ret) return ret; + } + + if(ctx->stored.srgb) + { + ret = write_chunk(ctx, type_srgb, &ctx->srgb_rendering_intent, 1); + if(ret) return ret; + } + + ret = write_unknown_chunks(ctx, SPNG_AFTER_IHDR); + if(ret) return ret; + + if(ctx->stored.plte) + { + for(i=0; i < ctx->plte.n_entries; i++) + { + data[i * 3 + 0] = ctx->plte.entries[i].red; + data[i * 3 + 1] = ctx->plte.entries[i].green; + data[i * 3 + 2] = ctx->plte.entries[i].blue; + } + + ret = write_chunk(ctx, type_plte, data, ctx->plte.n_entries * 3); + if(ret) return ret; + } + + if(ctx->stored.bkgd) + { + switch(ctx->ihdr.color_type) + { + case SPNG_COLOR_TYPE_GRAYSCALE: + case SPNG_COLOR_TYPE_GRAYSCALE_ALPHA: + { + length = 2; + + write_u16(data, ctx->bkgd.gray); + + break; + } + case SPNG_COLOR_TYPE_TRUECOLOR: + case SPNG_COLOR_TYPE_TRUECOLOR_ALPHA: + { + length = 6; + + write_u16(data, ctx->bkgd.red); + write_u16(data + 2, ctx->bkgd.green); + write_u16(data + 4, ctx->bkgd.blue); + + break; + } + case SPNG_COLOR_TYPE_INDEXED: + { + length = 1; + + data[0] = ctx->bkgd.plte_index; + + break; + } + default: return SPNG_EINTERNAL; + } + + ret = write_chunk(ctx, type_bkgd, data, length); + if(ret) return ret; + } + + if(ctx->stored.hist) + { + length = ctx->plte.n_entries * 2; + + for(i=0; i < ctx->plte.n_entries; i++) + { + write_u16(data + i * 2, ctx->hist.frequency[i]); + } + + ret = write_chunk(ctx, type_hist, data, length); + if(ret) return ret; + } + + if(ctx->stored.trns) + { + if(ctx->ihdr.color_type == SPNG_COLOR_TYPE_GRAYSCALE) + { + write_u16(data, ctx->trns.gray); + + ret = write_chunk(ctx, type_trns, data, 2); + } + else if(ctx->ihdr.color_type == SPNG_COLOR_TYPE_TRUECOLOR) + { + write_u16(data, ctx->trns.red); + write_u16(data + 2, ctx->trns.green); + write_u16(data + 4, ctx->trns.blue); + + ret = write_chunk(ctx, type_trns, data, 6); + } + else if(ctx->ihdr.color_type == SPNG_COLOR_TYPE_INDEXED) + { + ret = write_chunk(ctx, type_trns, ctx->trns.type3_alpha, ctx->trns.n_type3_entries); + } + + if(ret) return ret; + } + + if(ctx->stored.phys) + { + write_u32(data, ctx->phys.ppu_x); + write_u32(data + 4, ctx->phys.ppu_y); + data[8] = ctx->phys.unit_specifier; + + ret = write_chunk(ctx, type_phys, data, 9); + if(ret) return ret; + } + + if(ctx->stored.splt) + { + const struct spng_splt *splt; + unsigned char *cdata = NULL; + + uint32_t k; + for(i=0; i < ctx->n_splt; i++) + { + splt = &ctx->splt_list[i]; + + size_t name_len = strlen(splt->name); + length = name_len + 1; + + if(splt->sample_depth == 8) length += splt->n_entries * 6 + 1; + else if(splt->sample_depth == 16) length += splt->n_entries * 10 + 1; + + ret = write_header(ctx, type_splt, length, &cdata); + if(ret) return ret; + + memcpy(cdata, splt->name, name_len + 1); + cdata += name_len + 2; + cdata[-1] = splt->sample_depth; + + if(splt->sample_depth == 8) + { + for(k=0; k < splt->n_entries; k++) + { + cdata[k * 6 + 0] = splt->entries[k].red; + cdata[k * 6 + 1] = splt->entries[k].green; + cdata[k * 6 + 2] = splt->entries[k].blue; + cdata[k * 6 + 3] = splt->entries[k].alpha; + write_u16(cdata + k * 6 + 4, splt->entries[k].frequency); + } + } + else if(splt->sample_depth == 16) + { + for(k=0; k < splt->n_entries; k++) + { + write_u16(cdata + k * 10 + 0, splt->entries[k].red); + write_u16(cdata + k * 10 + 2, splt->entries[k].green); + write_u16(cdata + k * 10 + 4, splt->entries[k].blue); + write_u16(cdata + k * 10 + 6, splt->entries[k].alpha); + write_u16(cdata + k * 10 + 8, splt->entries[k].frequency); + } + } + + ret = finish_chunk(ctx); + if(ret) return ret; + } + } + + if(ctx->stored.time) + { + write_u16(data, ctx->time.year); + data[2] = ctx->time.month; + data[3] = ctx->time.day; + data[4] = ctx->time.hour; + data[5] = ctx->time.minute; + data[6] = ctx->time.second; + + ret = write_chunk(ctx, type_time, data, 7); + if(ret) return ret; + } + + if(ctx->stored.text) + { + unsigned char *cdata = NULL; + const struct spng_text2 *text; + const uint8_t *text_type_array[4] = { 0, type_text, type_ztxt, type_itxt }; + + for(i=0; i < ctx->n_text; i++) + { + text = &ctx->text_list[i]; + + const uint8_t *text_chunk_type = text_type_array[text->type]; + Bytef *compressed_text = NULL; + size_t keyword_len = 0; + size_t language_tag_len = 0; + size_t translated_keyword_len = 0; + size_t compressed_length = 0; + size_t text_length = 0; + + keyword_len = strlen(text->keyword); + text_length = strlen(text->text); + + length = keyword_len + 1; + + if(text->type == SPNG_ZTXT) + { + length += 1; /* compression method */ + } + else if(text->type == SPNG_ITXT) + { + if(!text->language_tag || !text->translated_keyword) return SPNG_EINTERNAL; + + language_tag_len = strlen(text->language_tag); + translated_keyword_len = strlen(text->translated_keyword); + + length += language_tag_len; + if(length < language_tag_len) return SPNG_EOVERFLOW; + + length += translated_keyword_len; + if(length < translated_keyword_len) return SPNG_EOVERFLOW; + + length += 4; /* compression flag + method + nul for the two strings */ + if(length < 4) return SPNG_EOVERFLOW; + } + + if(text->compression_flag) + { + ret = spng__deflate_init(ctx, &ctx->text_options); + if(ret) return ret; + + z_stream *zstream = &ctx->zstream; + uLongf dest_len = deflateBound(zstream, (uLong)text_length); + + compressed_text = spng__malloc(ctx, dest_len); + + if(compressed_text == NULL) return SPNG_EMEM; + + zstream->next_in = (void*)text->text; + zstream->avail_in = (uInt)text_length; + + zstream->next_out = compressed_text; + zstream->avail_out = dest_len; + + ret = deflate(zstream, Z_FINISH); + + if(ret != Z_STREAM_END) + { + spng__free(ctx, compressed_text); + return SPNG_EZLIB; + } + + compressed_length = zstream->total_out; + + length += compressed_length; + if(length < compressed_length) return SPNG_EOVERFLOW; + } + else + { + text_length = strlen(text->text); + + length += text_length; + if(length < text_length) return SPNG_EOVERFLOW; + } + + ret = write_header(ctx, text_chunk_type, length, &cdata); + if(ret) + { + spng__free(ctx, compressed_text); + return ret; + } + + memcpy(cdata, text->keyword, keyword_len + 1); + cdata += keyword_len + 1; + + if(text->type == SPNG_ITXT) + { + cdata[0] = text->compression_flag; + cdata[1] = 0; /* compression method */ + cdata += 2; + + memcpy(cdata, text->language_tag, language_tag_len + 1); + cdata += language_tag_len + 1; + + memcpy(cdata, text->translated_keyword, translated_keyword_len + 1); + cdata += translated_keyword_len + 1; + } + else if(text->type == SPNG_ZTXT) + { + cdata[0] = 0; /* compression method */ + cdata++; + } + + if(text->compression_flag) memcpy(cdata, compressed_text, compressed_length); + else memcpy(cdata, text->text, text_length); + + spng__free(ctx, compressed_text); + + ret = finish_chunk(ctx); + if(ret) return ret; + } + } + + if(ctx->stored.offs) + { + write_s32(data, ctx->offs.x); + write_s32(data + 4, ctx->offs.y); + data[8] = ctx->offs.unit_specifier; + + ret = write_chunk(ctx, type_offs, data, 9); + if(ret) return ret; + } + + if(ctx->stored.exif) + { + ret = write_chunk(ctx, type_exif, ctx->exif.data, ctx->exif.length); + if(ret) return ret; + } + + ret = write_unknown_chunks(ctx, SPNG_AFTER_PLTE); + if(ret) return ret; + + return 0; +} + +static int write_chunks_after_idat(spng_ctx *ctx) +{ + if(ctx == NULL) return SPNG_EINTERNAL; + + int ret = write_unknown_chunks(ctx, SPNG_AFTER_IDAT); + if(ret) return ret; + + return write_iend(ctx); +} + +/* Compress and write scanline to IDAT stream */ +static int write_idat_bytes(spng_ctx *ctx, const void *scanline, size_t len, int flush) +{ + if(ctx == NULL || scanline == NULL) return SPNG_EINTERNAL; + if(len > UINT_MAX) return SPNG_EINTERNAL; + + int ret = 0; + unsigned char *data = NULL; + z_stream *zstream = &ctx->zstream; + uint32_t idat_length = SPNG_WRITE_SIZE; + + zstream->next_in = scanline; + zstream->avail_in = (uInt)len; + + do + { + ret = deflate(zstream, flush); + + if(zstream->avail_out == 0) + { + ret = finish_chunk(ctx); + if(ret) return encode_err(ctx, ret); + + ret = write_header(ctx, type_idat, idat_length, &data); + if(ret) return encode_err(ctx, ret); + + zstream->next_out = data; + zstream->avail_out = idat_length; + } + + }while(zstream->avail_in); + + if(ret != Z_OK) return SPNG_EZLIB; + + return 0; +} + +static int finish_idat(spng_ctx *ctx) +{ + int ret = 0; + unsigned char *data = NULL; + z_stream *zstream = &ctx->zstream; + uint32_t idat_length = SPNG_WRITE_SIZE; + + while(ret != Z_STREAM_END) + { + ret = deflate(zstream, Z_FINISH); + + if(ret) + { + if(ret == Z_STREAM_END) break; + + if(ret != Z_BUF_ERROR) return SPNG_EZLIB; + } + + if(zstream->avail_out == 0) + { + ret = finish_chunk(ctx); + if(ret) return encode_err(ctx, ret); + + ret = write_header(ctx, type_idat, idat_length, &data); + if(ret) return encode_err(ctx, ret); + + zstream->next_out = data; + zstream->avail_out = idat_length; + } + } + + uint32_t trimmed_length = idat_length - zstream->avail_out; + + ret = trim_chunk(ctx, trimmed_length); + if(ret) return ret; + + return finish_chunk(ctx); +} + +static int encode_scanline(spng_ctx *ctx, const void *scanline, size_t len) +{ + if(ctx == NULL || scanline == NULL) return SPNG_EINTERNAL; + + int ret, pass = ctx->row_info.pass; + uint8_t filter = 0; + struct spng_row_info *ri = &ctx->row_info; + const struct spng_subimage *sub = ctx->subimage; + struct encode_flags f = ctx->encode_flags; + unsigned char *filtered_scanline = ctx->filtered_scanline; + size_t scanline_width = sub[pass].scanline_width; + + if(len < scanline_width - 1) return SPNG_EINTERNAL; + + /* encode_row() interlaces directly to ctx->scanline */ + if(scanline != ctx->scanline) memcpy(ctx->scanline, scanline, scanline_width - 1); + + if(f.to_bigendian) u16_row_to_bigendian(ctx->scanline, scanline_width - 1); + const int requires_previous = f.filter_choice & (SPNG_FILTER_CHOICE_UP | SPNG_FILTER_CHOICE_AVG | SPNG_FILTER_CHOICE_PAETH); + + /* XXX: exclude 'requires_previous' filters by default for first scanline? */ + if(!ri->scanline_idx && requires_previous) + { + /* prev_scanline is all zeros for the first scanline */ + memset(ctx->prev_scanline, 0, scanline_width); + } + + filter = get_best_filter(ctx->prev_scanline, ctx->scanline, scanline_width, ctx->bytes_per_pixel, f.filter_choice); + + if(!filter) filtered_scanline = ctx->scanline; + + filtered_scanline[-1] = filter; + + if(filter) + { + ret = filter_scanline(filtered_scanline, ctx->prev_scanline, ctx->scanline, scanline_width, ctx->bytes_per_pixel, filter); + if(ret) return encode_err(ctx, ret); + } + + ret = write_idat_bytes(ctx, filtered_scanline - 1, scanline_width, Z_NO_FLUSH); + if(ret) return encode_err(ctx, ret); + + /* The previous scanline is always unfiltered */ + void *t = ctx->prev_scanline; + ctx->prev_scanline = ctx->scanline; + ctx->scanline = t; + + ret = update_row_info(ctx); + + if(ret == SPNG_EOI) + { + int error = finish_idat(ctx); + if(error) encode_err(ctx, error); + + if(f.finalize) + { + error = spng_encode_chunks(ctx); + if(error) return encode_err(ctx, error); + } + } + + return ret; +} + +static int encode_row(spng_ctx *ctx, const void *row, size_t len) +{ + if(ctx == NULL || row == NULL) return SPNG_EINTERNAL; + + const int pass = ctx->row_info.pass; + + if(!ctx->ihdr.interlace_method || pass == 6) return encode_scanline(ctx, row, len); + + uint32_t k; + const unsigned pixel_size = ctx->pixel_size; + const unsigned bit_depth = ctx->ihdr.bit_depth; + + if(bit_depth < 8) + { + const unsigned samples_per_byte = 8 / bit_depth; + const uint8_t mask = (1 << bit_depth) - 1; + const unsigned initial_shift = 8 - bit_depth; + unsigned shift_amount = initial_shift; + + unsigned char *scanline = ctx->scanline; + const unsigned char *row_uc = row; + uint8_t sample; + + memset(scanline, 0, ctx->subimage[pass].scanline_width); + + for(k=0; k < ctx->subimage[pass].width; k++) + { + size_t ioffset = adam7_x_start[pass] + k * adam7_x_delta[pass]; + + sample = row_uc[ioffset / samples_per_byte]; + + sample = sample >> (initial_shift - ioffset * bit_depth % 8); + sample = sample & mask; + sample = sample << shift_amount; + + scanline[0] |= sample; + + shift_amount -= bit_depth; + + if(shift_amount > 7) + { + shift_amount = initial_shift; + scanline++; + } + } + + return encode_scanline(ctx, ctx->scanline, len); + } + + for(k=0; k < ctx->subimage[pass].width; k++) + { + size_t ioffset = (adam7_x_start[pass] + (size_t) k * adam7_x_delta[pass]) * pixel_size; + + memcpy(ctx->scanline + k * pixel_size, (unsigned char*)row + ioffset, pixel_size); + } + + return encode_scanline(ctx, ctx->scanline, len); +} + +int spng_encode_scanline(spng_ctx *ctx, const void *scanline, size_t len) +{ + if(ctx == NULL || scanline == NULL) return SPNG_EINVAL; + if(ctx->state >= SPNG_STATE_EOI) return SPNG_EOI; + if(len < (ctx->subimage[ctx->row_info.pass].scanline_width -1) ) return SPNG_EBUFSIZ; + + return encode_scanline(ctx, scanline, len); +} + +int spng_encode_row(spng_ctx *ctx, const void *row, size_t len) +{ + if(ctx == NULL || row == NULL) return SPNG_EINVAL; + if(ctx->state >= SPNG_STATE_EOI) return SPNG_EOI; + if(len < ctx->image_width) return SPNG_EBUFSIZ; + + return encode_row(ctx, row, len); +} + +int spng_encode_chunks(spng_ctx *ctx) +{ + if(ctx == NULL) return 1; + if(!ctx->state) return SPNG_EBADSTATE; + if(ctx->state < SPNG_STATE_OUTPUT) return SPNG_ENODST; + if(!ctx->encode_only) return SPNG_ECTXTYPE; + + int ret = 0; + + if(ctx->state < SPNG_STATE_FIRST_IDAT) + { + if(!ctx->stored.ihdr) return SPNG_ENOIHDR; + + ret = write_chunks_before_idat(ctx); + if(ret) return encode_err(ctx, ret); + + ctx->state = SPNG_STATE_FIRST_IDAT; + } + else if(ctx->state == SPNG_STATE_FIRST_IDAT) + { + return 0; + } + else if(ctx->state == SPNG_STATE_EOI) + { + ret = write_chunks_after_idat(ctx); + if(ret) return encode_err(ctx, ret); + + ctx->state = SPNG_STATE_IEND; + } + else return SPNG_EOPSTATE; + + return 0; +} + +int spng_encode_image(spng_ctx *ctx, const void *img, size_t len, int fmt, int flags) +{ + if(ctx == NULL) return 1; + if(!ctx->state) return SPNG_EBADSTATE; + if(!ctx->encode_only) return SPNG_ECTXTYPE; + if(!ctx->stored.ihdr) return SPNG_ENOIHDR; + if( !(fmt == SPNG_FMT_PNG || fmt == SPNG_FMT_RAW) ) return SPNG_EFMT; + + int ret = 0; + const struct spng_ihdr *ihdr = &ctx->ihdr; + struct encode_flags *encode_flags = &ctx->encode_flags; + + if(ihdr->color_type == SPNG_COLOR_TYPE_INDEXED && !ctx->stored.plte) return SPNG_ENOPLTE; + + ret = calculate_image_width(ihdr, fmt, &ctx->image_width); + if(ret) return encode_err(ctx, ret); + + if(ctx->image_width > SIZE_MAX / ihdr->height) ctx->image_size = 0; /* overflow */ + else ctx->image_size = ctx->image_width * ihdr->height; + + if( !(flags & SPNG_ENCODE_PROGRESSIVE) ) + { + if(img == NULL) return 1; + if(!ctx->image_size) return SPNG_EOVERFLOW; + if(len != ctx->image_size) return SPNG_EBUFSIZ; + } + + ret = spng_encode_chunks(ctx); + if(ret) return encode_err(ctx, ret); + + ret = calculate_subimages(ctx); + if(ret) return encode_err(ctx, ret); + + if(ihdr->bit_depth < 8) ctx->bytes_per_pixel = 1; + else ctx->bytes_per_pixel = num_channels(ihdr) * (ihdr->bit_depth / 8); + + if(spng__optimize(SPNG_FILTER_CHOICE)) + { + /* Filtering would make no difference */ + if(!ctx->image_options.compression_level) + { + encode_flags->filter_choice = SPNG_DISABLE_FILTERING; + } + + /* Palette indices and low bit-depth images do not benefit from filtering */ + if(ihdr->color_type == SPNG_COLOR_TYPE_INDEXED || ihdr->bit_depth < 8) + { + encode_flags->filter_choice = SPNG_DISABLE_FILTERING; + } + } + + /* This is technically the same as disabling filtering */ + if(encode_flags->filter_choice == SPNG_FILTER_CHOICE_NONE) + { + encode_flags->filter_choice = SPNG_DISABLE_FILTERING; + } + + if(!encode_flags->filter_choice && spng__optimize(SPNG_IMG_COMPRESSION_STRATEGY)) + { + ctx->image_options.strategy = Z_DEFAULT_STRATEGY; + } + + ret = spng__deflate_init(ctx, &ctx->image_options); + if(ret) return encode_err(ctx, ret); + + size_t scanline_buf_size = ctx->subimage[ctx->widest_pass].scanline_width; + + scanline_buf_size += 32; + + if(scanline_buf_size < 32) return SPNG_EOVERFLOW; + + ctx->scanline_buf = spng__malloc(ctx, scanline_buf_size); + ctx->prev_scanline_buf = spng__malloc(ctx, scanline_buf_size); + + if(ctx->scanline_buf == NULL || ctx->prev_scanline_buf == NULL) return encode_err(ctx, SPNG_EMEM); + + /* Maintain alignment for pixels, filter at [-1] */ + ctx->scanline = ctx->scanline_buf + 16; + ctx->prev_scanline = ctx->prev_scanline_buf + 16; + + if(encode_flags->filter_choice) + { + ctx->filtered_scanline_buf = spng__malloc(ctx, scanline_buf_size); + if(ctx->filtered_scanline_buf == NULL) return encode_err(ctx, SPNG_EMEM); + + ctx->filtered_scanline = ctx->filtered_scanline_buf + 16; + } + + struct spng_subimage *sub = ctx->subimage; + struct spng_row_info *ri = &ctx->row_info; + + ctx->fmt = fmt; + + z_stream *zstream = &ctx->zstream; + zstream->avail_out = SPNG_WRITE_SIZE; + + ret = write_header(ctx, type_idat, zstream->avail_out, &zstream->next_out); + if(ret) return encode_err(ctx, ret); + + if(ihdr->interlace_method) encode_flags->interlace = 1; + + if(fmt & (SPNG_FMT_PNG | SPNG_FMT_RAW) ) encode_flags->same_layout = 1; + + if(ihdr->bit_depth == 16 && fmt != SPNG_FMT_RAW) encode_flags->to_bigendian = 1; + + if(flags & SPNG_ENCODE_FINALIZE) encode_flags->finalize = 1; + + while(!sub[ri->pass].width || !sub[ri->pass].height) ri->pass++; + + if(encode_flags->interlace) ri->row_num = adam7_y_start[ri->pass]; + + ctx->pixel_size = 4; /* SPNG_FMT_RGBA8 */ + + if(fmt == SPNG_FMT_RGBA16) ctx->pixel_size = 8; + else if(fmt == SPNG_FMT_RGB8) ctx->pixel_size = 3; + else if(fmt == SPNG_FMT_G8) ctx->pixel_size = 1; + else if(fmt == SPNG_FMT_GA8) ctx->pixel_size = 2; + else if(fmt & (SPNG_FMT_PNG | SPNG_FMT_RAW)) ctx->pixel_size = ctx->bytes_per_pixel; + + ctx->state = SPNG_STATE_ENCODE_INIT; + + if(flags & SPNG_ENCODE_PROGRESSIVE) + { + encode_flags->progressive = 1; + + return 0; + } + + do + { + size_t ioffset = ri->row_num * ctx->image_width; + + ret = encode_row(ctx, (unsigned char*)img + ioffset, ctx->image_width); + + }while(!ret); + + if(ret != SPNG_EOI) return encode_err(ctx, ret); + + return 0; +} + +spng_ctx *spng_ctx_new(int flags) +{ + struct spng_alloc alloc = + { + .malloc_fn = malloc, + .realloc_fn = realloc, + .calloc_fn = calloc, + .free_fn = free + }; + + return spng_ctx_new2(&alloc, flags); +} + +spng_ctx *spng_ctx_new2(struct spng_alloc *alloc, int flags) +{ + if(alloc == NULL) return NULL; + if(flags != (flags & SPNG__CTX_FLAGS_ALL)) return NULL; + + if(alloc->malloc_fn == NULL) return NULL; + if(alloc->realloc_fn == NULL) return NULL; + if(alloc->calloc_fn == NULL) return NULL; + if(alloc->free_fn == NULL) return NULL; + + spng_ctx *ctx = alloc->calloc_fn(1, sizeof(spng_ctx)); + if(ctx == NULL) return NULL; + + ctx->alloc = *alloc; + + ctx->max_width = spng_u32max; + ctx->max_height = spng_u32max; + + ctx->max_chunk_size = spng_u32max; + ctx->chunk_cache_limit = SIZE_MAX; + ctx->chunk_count_limit = SPNG_MAX_CHUNK_COUNT; + + ctx->state = SPNG_STATE_INIT; + + ctx->crc_action_critical = SPNG_CRC_ERROR; + ctx->crc_action_ancillary = SPNG_CRC_DISCARD; + + const struct spng__zlib_options image_defaults = + { + .compression_level = Z_DEFAULT_COMPRESSION, + .window_bits = 15, + .mem_level = 8, + .strategy = Z_FILTERED, + .data_type = 0 /* Z_BINARY */ + }; + + const struct spng__zlib_options text_defaults = + { + .compression_level = Z_DEFAULT_COMPRESSION, + .window_bits = 15, + .mem_level = 8, + .strategy = Z_DEFAULT_STRATEGY, + .data_type = 1 /* Z_TEXT */ + }; + + ctx->image_options = image_defaults; + ctx->text_options = text_defaults; + + ctx->optimize_option = ~0; + ctx->encode_flags.filter_choice = SPNG_FILTER_CHOICE_ALL; + + ctx->flags = flags; + + if(flags & SPNG_CTX_ENCODER) ctx->encode_only = 1; + + return ctx; +} + +void spng_ctx_free(spng_ctx *ctx) +{ + if(ctx == NULL) return; + + if(ctx->streaming && ctx->stream_buf != NULL) spng__free(ctx, ctx->stream_buf); + + if(!ctx->user.exif) spng__free(ctx, ctx->exif.data); + + if(!ctx->user.iccp) spng__free(ctx, ctx->iccp.profile); + + uint32_t i; + + if(ctx->splt_list != NULL && !ctx->user.splt) + { + for(i=0; i < ctx->n_splt; i++) + { + spng__free(ctx, ctx->splt_list[i].entries); + } + spng__free(ctx, ctx->splt_list); + } + + if(ctx->text_list != NULL) + { + for(i=0; i< ctx->n_text; i++) + { + if(ctx->user.text) break; + + spng__free(ctx, ctx->text_list[i].keyword); + if(ctx->text_list[i].compression_flag) spng__free(ctx, ctx->text_list[i].text); + } + spng__free(ctx, ctx->text_list); + } + + if(ctx->chunk_list != NULL && !ctx->user.unknown) + { + for(i=0; i< ctx->n_chunks; i++) + { + spng__free(ctx, ctx->chunk_list[i].data); + } + spng__free(ctx, ctx->chunk_list); + } + + if(ctx->deflate) deflateEnd(&ctx->zstream); + else inflateEnd(&ctx->zstream); + + if(!ctx->user_owns_out_png) spng__free(ctx, ctx->out_png); + + spng__free(ctx, ctx->gamma_lut16); + + spng__free(ctx, ctx->row_buf); + spng__free(ctx, ctx->scanline_buf); + spng__free(ctx, ctx->prev_scanline_buf); + spng__free(ctx, ctx->filtered_scanline_buf); + + spng_free_fn *free_fn = ctx->alloc.free_fn; + + memset(ctx, 0, sizeof(spng_ctx)); + + free_fn(ctx); +} + +static int buffer_read_fn(spng_ctx *ctx, void *user, void *data, size_t n) +{ + if(n > ctx->bytes_left) return SPNG_IO_EOF; + + (void)user; + (void)data; + ctx->data = ctx->data + ctx->last_read_size; + + ctx->last_read_size = n; + ctx->bytes_left -= n; + + return 0; +} + +static int file_read_fn(spng_ctx *ctx, void *user, void *data, size_t n) +{ + FILE *file = user; + (void)ctx; + + if(fread(data, n, 1, file) != 1) + { + if(feof(file)) return SPNG_IO_EOF; + else return SPNG_IO_ERROR; + } + + return 0; +} + +static int file_write_fn(spng_ctx *ctx, void *user, void *data, size_t n) +{ + FILE *file = user; + (void)ctx; + + if(fwrite(data, n, 1, file) != 1) return SPNG_IO_ERROR; + + return 0; +} + +int spng_set_png_buffer(spng_ctx *ctx, const void *buf, size_t size) +{ + if(ctx == NULL || buf == NULL) return 1; + if(!ctx->state) return SPNG_EBADSTATE; + if(ctx->encode_only) return SPNG_ECTXTYPE; /* not supported */ + + if(ctx->data != NULL) return SPNG_EBUF_SET; + + ctx->data = buf; + ctx->png_base = buf; + ctx->data_size = size; + ctx->bytes_left = size; + + ctx->read_fn = buffer_read_fn; + + ctx->state = SPNG_STATE_INPUT; + + return 0; +} + +int spng_set_png_stream(spng_ctx *ctx, spng_rw_fn *rw_func, void *user) +{ + if(ctx == NULL || rw_func == NULL) return 1; + if(!ctx->state) return SPNG_EBADSTATE; + + /* SPNG_STATE_OUTPUT shares the same value */ + if(ctx->state >= SPNG_STATE_INPUT) return SPNG_EBUF_SET; + + if(ctx->encode_only) + { + if(ctx->out_png != NULL) return SPNG_EBUF_SET; + + ctx->write_fn = rw_func; + ctx->write_ptr = ctx->stream_buf; + + ctx->state = SPNG_STATE_OUTPUT; + } + else + { + ctx->stream_buf = spng__malloc(ctx, SPNG_READ_SIZE); + if(ctx->stream_buf == NULL) return SPNG_EMEM; + + ctx->read_fn = rw_func; + ctx->data = ctx->stream_buf; + ctx->data_size = SPNG_READ_SIZE; + + ctx->state = SPNG_STATE_INPUT; + } + + ctx->stream_user_ptr = user; + + ctx->streaming = 1; + + return 0; +} + +int spng_set_png_file(spng_ctx *ctx, FILE *file) +{ + if(file == NULL) return 1; + + if(ctx->encode_only) return spng_set_png_stream(ctx, file_write_fn, file); + + return spng_set_png_stream(ctx, file_read_fn, file); +} + +void *spng_get_png_buffer(spng_ctx *ctx, size_t *len, int *error) +{ + int tmp = 0; + error = error ? error : &tmp; + *error = 0; + + if(ctx == NULL || !len) *error = SPNG_EINVAL; + + if(*error) return NULL; + + if(!ctx->encode_only) *error = SPNG_ECTXTYPE; + else if(!ctx->state) *error = SPNG_EBADSTATE; + else if(!ctx->internal_buffer) *error = SPNG_EOPSTATE; + else if(ctx->state < SPNG_STATE_EOI) *error = SPNG_EOPSTATE; + else if(ctx->state != SPNG_STATE_IEND) *error = SPNG_ENOTFINAL; + + if(*error) return NULL; + + ctx->user_owns_out_png = 1; + + *len = ctx->bytes_encoded; + + return ctx->out_png; +} + +int spng_set_image_limits(spng_ctx *ctx, uint32_t width, uint32_t height) +{ + if(ctx == NULL) return 1; + + if(width > spng_u32max || height > spng_u32max) return 1; + + ctx->max_width = width; + ctx->max_height = height; + + return 0; +} + +int spng_get_image_limits(spng_ctx *ctx, uint32_t *width, uint32_t *height) +{ + if(ctx == NULL || width == NULL || height == NULL) return 1; + + *width = ctx->max_width; + *height = ctx->max_height; + + return 0; +} + +int spng_set_chunk_limits(spng_ctx *ctx, size_t chunk_size, size_t cache_limit) +{ + if(ctx == NULL || chunk_size > spng_u32max || chunk_size > cache_limit) return 1; + + ctx->max_chunk_size = chunk_size; + + ctx->chunk_cache_limit = cache_limit; + + return 0; +} + +int spng_get_chunk_limits(spng_ctx *ctx, size_t *chunk_size, size_t *cache_limit) +{ + if(ctx == NULL || chunk_size == NULL || cache_limit == NULL) return 1; + + *chunk_size = ctx->max_chunk_size; + + *cache_limit = ctx->chunk_cache_limit; + + return 0; +} + +int spng_set_crc_action(spng_ctx *ctx, int critical, int ancillary) +{ + if(ctx == NULL) return 1; + if(ctx->encode_only) return SPNG_ECTXTYPE; + + if(critical > 2 || critical < 0) return 1; + if(ancillary > 2 || ancillary < 0) return 1; + + if(critical == SPNG_CRC_DISCARD) return 1; + + ctx->crc_action_critical = critical; + ctx->crc_action_ancillary = ancillary; + + return 0; +} + +int spng_set_option(spng_ctx *ctx, enum spng_option option, int value) +{ + if(ctx == NULL) return 1; + if(!ctx->state) return SPNG_EBADSTATE; + + switch(option) + { + case SPNG_KEEP_UNKNOWN_CHUNKS: + { + ctx->keep_unknown = value ? 1 : 0; + break; + } + case SPNG_IMG_COMPRESSION_LEVEL: + { + ctx->image_options.compression_level = value; + break; + } + case SPNG_IMG_WINDOW_BITS: + { + ctx->image_options.window_bits = value; + break; + } + case SPNG_IMG_MEM_LEVEL: + { + ctx->image_options.mem_level = value; + break; + } + case SPNG_IMG_COMPRESSION_STRATEGY: + { + ctx->image_options.strategy = value; + break; + } + case SPNG_TEXT_COMPRESSION_LEVEL: + { + ctx->text_options.compression_level = value; + break; + } + case SPNG_TEXT_WINDOW_BITS: + { + ctx->text_options.window_bits = value; + break; + } + case SPNG_TEXT_MEM_LEVEL: + { + ctx->text_options.mem_level = value; + break; + } + case SPNG_TEXT_COMPRESSION_STRATEGY: + { + ctx->text_options.strategy = value; + break; + } + case SPNG_FILTER_CHOICE: + { + if(value & ~SPNG_FILTER_CHOICE_ALL) return 1; + ctx->encode_flags.filter_choice = value; + break; + } + case SPNG_CHUNK_COUNT_LIMIT: + { + if(value < 0) return 1; + if(value > (int)ctx->chunk_count_total) return 1; + ctx->chunk_count_limit = value; + break; + } + case SPNG_ENCODE_TO_BUFFER: + { + if(value < 0) return 1; + if(!ctx->encode_only) return SPNG_ECTXTYPE; + if(ctx->state >= SPNG_STATE_OUTPUT) return SPNG_EOPSTATE; + + if(!value) break; + + ctx->internal_buffer = 1; + ctx->state = SPNG_STATE_OUTPUT; + + break; + } + default: return 1; + } + + /* Option can no longer be overriden by the library */ + if(option < 32) ctx->optimize_option &= ~(1 << option); + + return 0; +} + +int spng_get_option(spng_ctx *ctx, enum spng_option option, int *value) +{ + if(ctx == NULL || value == NULL) return 1; + if(!ctx->state) return SPNG_EBADSTATE; + + switch(option) + { + case SPNG_KEEP_UNKNOWN_CHUNKS: + { + *value = ctx->keep_unknown; + break; + } + case SPNG_IMG_COMPRESSION_LEVEL: + { + *value = ctx->image_options.compression_level; + break; + } + case SPNG_IMG_WINDOW_BITS: + { + *value = ctx->image_options.window_bits; + break; + } + case SPNG_IMG_MEM_LEVEL: + { + *value = ctx->image_options.mem_level; + break; + } + case SPNG_IMG_COMPRESSION_STRATEGY: + { + *value = ctx->image_options.strategy; + break; + } + case SPNG_TEXT_COMPRESSION_LEVEL: + { + *value = ctx->text_options.compression_level; + break; + } + case SPNG_TEXT_WINDOW_BITS: + { + *value = ctx->text_options.window_bits; + break; + } + case SPNG_TEXT_MEM_LEVEL: + { + *value = ctx->text_options.mem_level; + break; + } + case SPNG_TEXT_COMPRESSION_STRATEGY: + { + *value = ctx->text_options.strategy; + break; + } + case SPNG_FILTER_CHOICE: + { + *value = ctx->encode_flags.filter_choice; + break; + } + case SPNG_CHUNK_COUNT_LIMIT: + { + *value = ctx->chunk_count_limit; + break; + } + case SPNG_ENCODE_TO_BUFFER: + { + if(ctx->internal_buffer) *value = 1; + else *value = 0; + + break; + } + default: return 1; + } + + return 0; +} + +int spng_decoded_image_size(spng_ctx *ctx, int fmt, size_t *len) +{ + if(ctx == NULL || len == NULL) return 1; + + int ret = read_chunks(ctx, 1); + if(ret) return ret; + + ret = check_decode_fmt(&ctx->ihdr, fmt); + if(ret) return ret; + + return calculate_image_size(&ctx->ihdr, fmt, len); +} + +int spng_get_ihdr(spng_ctx *ctx, struct spng_ihdr *ihdr) +{ + if(ctx == NULL) return 1; + int ret = read_chunks(ctx, 1); + if(ret) return ret; + if(ihdr == NULL) return 1; + + *ihdr = ctx->ihdr; + + return 0; +} + +int spng_get_plte(spng_ctx *ctx, struct spng_plte *plte) +{ + SPNG_GET_CHUNK_BOILERPLATE(plte); + + *plte = ctx->plte; + + return 0; +} + +int spng_get_trns(spng_ctx *ctx, struct spng_trns *trns) +{ + SPNG_GET_CHUNK_BOILERPLATE(trns); + + *trns = ctx->trns; + + return 0; +} + +int spng_get_chrm(spng_ctx *ctx, struct spng_chrm *chrm) +{ + SPNG_GET_CHUNK_BOILERPLATE(chrm); + + chrm->white_point_x = (double)ctx->chrm_int.white_point_x / 100000.0; + chrm->white_point_y = (double)ctx->chrm_int.white_point_y / 100000.0; + chrm->red_x = (double)ctx->chrm_int.red_x / 100000.0; + chrm->red_y = (double)ctx->chrm_int.red_y / 100000.0; + chrm->blue_y = (double)ctx->chrm_int.blue_y / 100000.0; + chrm->blue_x = (double)ctx->chrm_int.blue_x / 100000.0; + chrm->green_x = (double)ctx->chrm_int.green_x / 100000.0; + chrm->green_y = (double)ctx->chrm_int.green_y / 100000.0; + + return 0; +} + +int spng_get_chrm_int(spng_ctx *ctx, struct spng_chrm_int *chrm) +{ + SPNG_GET_CHUNK_BOILERPLATE(chrm); + + *chrm = ctx->chrm_int; + + return 0; +} + +int spng_get_gama(spng_ctx *ctx, double *gamma) +{ + double *gama = gamma; + SPNG_GET_CHUNK_BOILERPLATE(gama); + + *gama = (double)ctx->gama / 100000.0; + + return 0; +} + +int spng_get_gama_int(spng_ctx *ctx, uint32_t *gama_int) +{ + uint32_t *gama = gama_int; + SPNG_GET_CHUNK_BOILERPLATE(gama); + + *gama_int = ctx->gama; + + return 0; +} + +int spng_get_iccp(spng_ctx *ctx, struct spng_iccp *iccp) +{ + SPNG_GET_CHUNK_BOILERPLATE(iccp); + + *iccp = ctx->iccp; + + return 0; +} + +int spng_get_sbit(spng_ctx *ctx, struct spng_sbit *sbit) +{ + SPNG_GET_CHUNK_BOILERPLATE(sbit); + + *sbit = ctx->sbit; + + return 0; +} + +int spng_get_srgb(spng_ctx *ctx, uint8_t *rendering_intent) +{ + uint8_t *srgb = rendering_intent; + SPNG_GET_CHUNK_BOILERPLATE(srgb); + + *srgb = ctx->srgb_rendering_intent; + + return 0; +} + +int spng_get_text(spng_ctx *ctx, struct spng_text *text, uint32_t *n_text) +{ + if(ctx == NULL) return 1; + int ret = read_chunks(ctx, 0); + if(ret) return ret; + if(!ctx->stored.text) return SPNG_ECHUNKAVAIL; + if(n_text == NULL) return 1; + + if(text == NULL) + { + *n_text = ctx->n_text; + return 0; + } + + if(*n_text < ctx->n_text) return 1; + + uint32_t i; + for(i=0; i< ctx->n_text; i++) + { + text[i].type = ctx->text_list[i].type; + memcpy(&text[i].keyword, ctx->text_list[i].keyword, strlen(ctx->text_list[i].keyword) + 1); + text[i].compression_method = 0; + text[i].compression_flag = ctx->text_list[i].compression_flag; + text[i].language_tag = ctx->text_list[i].language_tag; + text[i].translated_keyword = ctx->text_list[i].translated_keyword; + text[i].length = ctx->text_list[i].text_length; + text[i].text = ctx->text_list[i].text; + } + + return ret; +} + +int spng_get_bkgd(spng_ctx *ctx, struct spng_bkgd *bkgd) +{ + SPNG_GET_CHUNK_BOILERPLATE(bkgd); + + *bkgd = ctx->bkgd; + + return 0; +} + +int spng_get_hist(spng_ctx *ctx, struct spng_hist *hist) +{ + SPNG_GET_CHUNK_BOILERPLATE(hist); + + *hist = ctx->hist; + + return 0; +} + +int spng_get_phys(spng_ctx *ctx, struct spng_phys *phys) +{ + SPNG_GET_CHUNK_BOILERPLATE(phys); + + *phys = ctx->phys; + + return 0; +} + +int spng_get_splt(spng_ctx *ctx, struct spng_splt *splt, uint32_t *n_splt) +{ + if(ctx == NULL) return 1; + int ret = read_chunks(ctx, 0); + if(ret) return ret; + if(!ctx->stored.splt) return SPNG_ECHUNKAVAIL; + if(n_splt == NULL) return 1; + + if(splt == NULL) + { + *n_splt = ctx->n_splt; + return 0; + } + + if(*n_splt < ctx->n_splt) return 1; + + memcpy(splt, ctx->splt_list, ctx->n_splt * sizeof(struct spng_splt)); + + return 0; +} + +int spng_get_time(spng_ctx *ctx, struct spng_time *time) +{ + SPNG_GET_CHUNK_BOILERPLATE(time); + + *time = ctx->time; + + return 0; +} + +int spng_get_unknown_chunks(spng_ctx *ctx, struct spng_unknown_chunk *chunks, uint32_t *n_chunks) +{ + if(ctx == NULL) return 1; + int ret = read_chunks(ctx, 0); + if(ret) return ret; + if(!ctx->stored.unknown) return SPNG_ECHUNKAVAIL; + if(n_chunks == NULL) return 1; + + if(chunks == NULL) + { + *n_chunks = ctx->n_chunks; + return 0; + } + + if(*n_chunks < ctx->n_chunks) return 1; + + memcpy(chunks, ctx->chunk_list, sizeof(struct spng_unknown_chunk)); + + return 0; +} + +int spng_get_offs(spng_ctx *ctx, struct spng_offs *offs) +{ + SPNG_GET_CHUNK_BOILERPLATE(offs); + + *offs = ctx->offs; + + return 0; +} + +int spng_get_exif(spng_ctx *ctx, struct spng_exif *exif) +{ + SPNG_GET_CHUNK_BOILERPLATE(exif); + + *exif = ctx->exif; + + return 0; +} + +int spng_set_ihdr(spng_ctx *ctx, struct spng_ihdr *ihdr) +{ + SPNG_SET_CHUNK_BOILERPLATE(ihdr); + + if(ctx->stored.ihdr) return 1; + + ret = check_ihdr(ihdr, ctx->max_width, ctx->max_height); + if(ret) return ret; + + ctx->ihdr = *ihdr; + + ctx->stored.ihdr = 1; + ctx->user.ihdr = 1; + + return 0; +} + +int spng_set_plte(spng_ctx *ctx, struct spng_plte *plte) +{ + SPNG_SET_CHUNK_BOILERPLATE(plte); + + if(!ctx->stored.ihdr) return 1; + + if(check_plte(plte, &ctx->ihdr)) return 1; + + ctx->plte.n_entries = plte->n_entries; + + memcpy(ctx->plte.entries, plte->entries, plte->n_entries * sizeof(struct spng_plte_entry)); + + ctx->stored.plte = 1; + ctx->user.plte = 1; + + return 0; +} + +int spng_set_trns(spng_ctx *ctx, struct spng_trns *trns) +{ + SPNG_SET_CHUNK_BOILERPLATE(trns); + + if(!ctx->stored.ihdr) return SPNG_ENOIHDR; + + if(ctx->ihdr.color_type == SPNG_COLOR_TYPE_GRAYSCALE) + { + ctx->trns.gray = trns->gray; + } + else if(ctx->ihdr.color_type == SPNG_COLOR_TYPE_TRUECOLOR) + { + ctx->trns.red = trns->red; + ctx->trns.green = trns->green; + ctx->trns.blue = trns->blue; + } + else if(ctx->ihdr.color_type == SPNG_COLOR_TYPE_INDEXED) + { + if(!ctx->stored.plte) return SPNG_ETRNS_NO_PLTE; + if(trns->n_type3_entries > ctx->plte.n_entries) return 1; + + ctx->trns.n_type3_entries = trns->n_type3_entries; + memcpy(ctx->trns.type3_alpha, trns->type3_alpha, trns->n_type3_entries); + } + else return SPNG_ETRNS_COLOR_TYPE; + + ctx->stored.trns = 1; + ctx->user.trns = 1; + + return 0; +} + +int spng_set_chrm(spng_ctx *ctx, struct spng_chrm *chrm) +{ + SPNG_SET_CHUNK_BOILERPLATE(chrm); + + struct spng_chrm_int chrm_int; + + chrm_int.white_point_x = (uint32_t)(chrm->white_point_x * 100000.0); + chrm_int.white_point_y = (uint32_t)(chrm->white_point_y * 100000.0); + chrm_int.red_x = (uint32_t)(chrm->red_x * 100000.0); + chrm_int.red_y = (uint32_t)(chrm->red_y * 100000.0); + chrm_int.green_x = (uint32_t)(chrm->green_x * 100000.0); + chrm_int.green_y = (uint32_t)(chrm->green_y * 100000.0); + chrm_int.blue_x = (uint32_t)(chrm->blue_x * 100000.0); + chrm_int.blue_y = (uint32_t)(chrm->blue_y * 100000.0); + + if(check_chrm_int(&chrm_int)) return SPNG_ECHRM; + + ctx->chrm_int = chrm_int; + + ctx->stored.chrm = 1; + ctx->user.chrm = 1; + + return 0; +} + +int spng_set_chrm_int(spng_ctx *ctx, struct spng_chrm_int *chrm_int) +{ + SPNG_SET_CHUNK_BOILERPLATE(chrm_int); + + if(check_chrm_int(chrm_int)) return SPNG_ECHRM; + + ctx->chrm_int = *chrm_int; + + ctx->stored.chrm = 1; + ctx->user.chrm = 1; + + return 0; +} + +int spng_set_gama(spng_ctx *ctx, double gamma) +{ + SPNG_SET_CHUNK_BOILERPLATE(ctx); + + uint32_t gama = gamma * 100000.0; + + if(!gama) return 1; + if(gama > spng_u32max) return 1; + + ctx->gama = gama; + + ctx->stored.gama = 1; + ctx->user.gama = 1; + + return 0; +} + +int spng_set_gama_int(spng_ctx *ctx, uint32_t gamma) +{ + SPNG_SET_CHUNK_BOILERPLATE(ctx); + + if(!gamma) return 1; + if(gamma > spng_u32max) return 1; + + ctx->gama = gamma; + + ctx->stored.gama = 1; + ctx->user.gama = 1; + + return 0; +} + +int spng_set_iccp(spng_ctx *ctx, struct spng_iccp *iccp) +{ + SPNG_SET_CHUNK_BOILERPLATE(iccp); + + if(check_png_keyword(iccp->profile_name)) return SPNG_EICCP_NAME; + if(!iccp->profile_len) return SPNG_ECHUNK_SIZE; + if(iccp->profile_len > spng_u32max) return SPNG_ECHUNK_STDLEN; + + if(ctx->iccp.profile && !ctx->user.iccp) spng__free(ctx, ctx->iccp.profile); + + ctx->iccp = *iccp; + + ctx->stored.iccp = 1; + ctx->user.iccp = 1; + + return 0; +} + +int spng_set_sbit(spng_ctx *ctx, struct spng_sbit *sbit) +{ + SPNG_SET_CHUNK_BOILERPLATE(sbit); + + if(check_sbit(sbit, &ctx->ihdr)) return 1; + + if(!ctx->stored.ihdr) return 1; + + ctx->sbit = *sbit; + + ctx->stored.sbit = 1; + ctx->user.sbit = 1; + + return 0; +} + +int spng_set_srgb(spng_ctx *ctx, uint8_t rendering_intent) +{ + SPNG_SET_CHUNK_BOILERPLATE(ctx); + + if(rendering_intent > 3) return 1; + + ctx->srgb_rendering_intent = rendering_intent; + + ctx->stored.srgb = 1; + ctx->user.srgb = 1; + + return 0; +} + +int spng_set_text(spng_ctx *ctx, struct spng_text *text, uint32_t n_text) +{ + if(!n_text) return 1; + SPNG_SET_CHUNK_BOILERPLATE(text); + + uint32_t i; + for(i=0; i < n_text; i++) + { + if(check_png_keyword(text[i].keyword)) return SPNG_ETEXT_KEYWORD; + if(!text[i].length) return 1; + if(text[i].length > UINT_MAX) return 1; + if(text[i].text == NULL) return 1; + + if(text[i].type == SPNG_TEXT) + { + if(ctx->strict && check_png_text(text[i].text, text[i].length)) return 1; + } + else if(text[i].type == SPNG_ZTXT) + { + if(ctx->strict && check_png_text(text[i].text, text[i].length)) return 1; + + if(text[i].compression_method != 0) return SPNG_EZTXT_COMPRESSION_METHOD; + } + else if(text[i].type == SPNG_ITXT) + { + if(text[i].compression_flag > 1) return SPNG_EITXT_COMPRESSION_FLAG; + if(text[i].compression_method != 0) return SPNG_EITXT_COMPRESSION_METHOD; + if(text[i].language_tag == NULL) return SPNG_EITXT_LANG_TAG; + if(text[i].translated_keyword == NULL) return SPNG_EITXT_TRANSLATED_KEY; + } + else return 1; + + } + + struct spng_text2 *text_list = spng__calloc(ctx, sizeof(struct spng_text2), n_text); + + if(!text_list) return SPNG_EMEM; + + if(ctx->text_list != NULL) + { + for(i=0; i < ctx->n_text; i++) + { + if(ctx->user.text) break; + + spng__free(ctx, ctx->text_list[i].keyword); + if(ctx->text_list[i].compression_flag) spng__free(ctx, ctx->text_list[i].text); + } + spng__free(ctx, ctx->text_list); + } + + for(i=0; i < n_text; i++) + { + text_list[i].type = text[i].type; + /* Prevent issues with spng_text.keyword[80] going out of scope */ + text_list[i].keyword = text_list[i].user_keyword_storage; + memcpy(text_list[i].user_keyword_storage, text[i].keyword, strlen(text[i].keyword)); + text_list[i].text = text[i].text; + text_list[i].text_length = text[i].length; + + if(text[i].type == SPNG_ZTXT) + { + text_list[i].compression_flag = 1; + } + else if(text[i].type == SPNG_ITXT) + { + text_list[i].compression_flag = text[i].compression_flag; + text_list[i].language_tag = text[i].language_tag; + text_list[i].translated_keyword = text[i].translated_keyword; + } + } + + ctx->text_list = text_list; + ctx->n_text = n_text; + + ctx->stored.text = 1; + ctx->user.text = 1; + + return 0; +} + +int spng_set_bkgd(spng_ctx *ctx, struct spng_bkgd *bkgd) +{ + SPNG_SET_CHUNK_BOILERPLATE(bkgd); + + if(!ctx->stored.ihdr) return 1; + + if(ctx->ihdr.color_type == 0 || ctx->ihdr.color_type == 4) + { + ctx->bkgd.gray = bkgd->gray; + } + else if(ctx->ihdr.color_type == 2 || ctx->ihdr.color_type == 6) + { + ctx->bkgd.red = bkgd->red; + ctx->bkgd.green = bkgd->green; + ctx->bkgd.blue = bkgd->blue; + } + else if(ctx->ihdr.color_type == 3) + { + if(!ctx->stored.plte) return SPNG_EBKGD_NO_PLTE; + if(bkgd->plte_index >= ctx->plte.n_entries) return SPNG_EBKGD_PLTE_IDX; + + ctx->bkgd.plte_index = bkgd->plte_index; + } + + ctx->stored.bkgd = 1; + ctx->user.bkgd = 1; + + return 0; +} + +int spng_set_hist(spng_ctx *ctx, struct spng_hist *hist) +{ + SPNG_SET_CHUNK_BOILERPLATE(hist); + + if(!ctx->stored.plte) return SPNG_EHIST_NO_PLTE; + + ctx->hist = *hist; + + ctx->stored.hist = 1; + ctx->user.hist = 1; + + return 0; +} + +int spng_set_phys(spng_ctx *ctx, struct spng_phys *phys) +{ + SPNG_SET_CHUNK_BOILERPLATE(phys); + + if(check_phys(phys)) return SPNG_EPHYS; + + ctx->phys = *phys; + + ctx->stored.phys = 1; + ctx->user.phys = 1; + + return 0; +} + +int spng_set_splt(spng_ctx *ctx, struct spng_splt *splt, uint32_t n_splt) +{ + if(!n_splt) return 1; + SPNG_SET_CHUNK_BOILERPLATE(splt); + + uint32_t i; + for(i=0; i < n_splt; i++) + { + if(check_png_keyword(splt[i].name)) return SPNG_ESPLT_NAME; + if( !(splt[i].sample_depth == 8 || splt[i].sample_depth == 16) ) return SPNG_ESPLT_DEPTH; + } + + if(ctx->stored.splt && !ctx->user.splt) + { + for(i=0; i < ctx->n_splt; i++) + { + if(ctx->splt_list[i].entries != NULL) spng__free(ctx, ctx->splt_list[i].entries); + } + spng__free(ctx, ctx->splt_list); + } + + ctx->splt_list = splt; + ctx->n_splt = n_splt; + + ctx->stored.splt = 1; + ctx->user.splt = 1; + + return 0; +} + +int spng_set_time(spng_ctx *ctx, struct spng_time *time) +{ + SPNG_SET_CHUNK_BOILERPLATE(time); + + if(check_time(time)) return SPNG_ETIME; + + ctx->time = *time; + + ctx->stored.time = 1; + ctx->user.time = 1; + + return 0; +} + +int spng_set_unknown_chunks(spng_ctx *ctx, struct spng_unknown_chunk *chunks, uint32_t n_chunks) +{ + if(!n_chunks) return 1; + SPNG_SET_CHUNK_BOILERPLATE(chunks); + + uint32_t i; + for(i=0; i < n_chunks; i++) + { + if(chunks[i].length > spng_u32max) return SPNG_ECHUNK_STDLEN; + if(chunks[i].length && chunks[i].data == NULL) return 1; + + switch(chunks[i].location) + { + case SPNG_AFTER_IHDR: + case SPNG_AFTER_PLTE: + case SPNG_AFTER_IDAT: + break; + default: return SPNG_ECHUNK_POS; + } + } + + if(ctx->stored.unknown && !ctx->user.unknown) + { + for(i=0; i < ctx->n_chunks; i++) + { + spng__free(ctx, ctx->chunk_list[i].data); + } + spng__free(ctx, ctx->chunk_list); + } + + ctx->chunk_list = chunks; + ctx->n_chunks = n_chunks; + + ctx->stored.unknown = 1; + ctx->user.unknown = 1; + + return 0; +} + +int spng_set_offs(spng_ctx *ctx, struct spng_offs *offs) +{ + SPNG_SET_CHUNK_BOILERPLATE(offs); + + if(check_offs(offs)) return SPNG_EOFFS; + + ctx->offs = *offs; + + ctx->stored.offs = 1; + ctx->user.offs = 1; + + return 0; +} + +int spng_set_exif(spng_ctx *ctx, struct spng_exif *exif) +{ + SPNG_SET_CHUNK_BOILERPLATE(exif); + + if(check_exif(exif)) return SPNG_EEXIF; + + if(ctx->exif.data != NULL && !ctx->user.exif) spng__free(ctx, ctx->exif.data); + + ctx->exif = *exif; + + ctx->stored.exif = 1; + ctx->user.exif = 1; + + return 0; +} + +const char *spng_strerror(int err) +{ + switch(err) + { + case SPNG_IO_EOF: return "end of stream"; + case SPNG_IO_ERROR: return "stream error"; + case SPNG_OK: return "success"; + case SPNG_EINVAL: return "invalid argument"; + case SPNG_EMEM: return "out of memory"; + case SPNG_EOVERFLOW: return "arithmetic overflow"; + case SPNG_ESIGNATURE: return "invalid signature"; + case SPNG_EWIDTH: return "invalid image width"; + case SPNG_EHEIGHT: return "invalid image height"; + case SPNG_EUSER_WIDTH: return "image width exceeds user limit"; + case SPNG_EUSER_HEIGHT: return "image height exceeds user limit"; + case SPNG_EBIT_DEPTH: return "invalid bit depth"; + case SPNG_ECOLOR_TYPE: return "invalid color type"; + case SPNG_ECOMPRESSION_METHOD: return "invalid compression method"; + case SPNG_EFILTER_METHOD: return "invalid filter method"; + case SPNG_EINTERLACE_METHOD: return "invalid interlace method"; + case SPNG_EIHDR_SIZE: return "invalid IHDR chunk size"; + case SPNG_ENOIHDR: return "missing IHDR chunk"; + case SPNG_ECHUNK_POS: return "invalid chunk position"; + case SPNG_ECHUNK_SIZE: return "invalid chunk length"; + case SPNG_ECHUNK_CRC: return "invalid chunk checksum"; + case SPNG_ECHUNK_TYPE: return "invalid chunk type"; + case SPNG_ECHUNK_UNKNOWN_CRITICAL: return "unknown critical chunk"; + case SPNG_EDUP_PLTE: return "duplicate PLTE chunk"; + case SPNG_EDUP_CHRM: return "duplicate cHRM chunk"; + case SPNG_EDUP_GAMA: return "duplicate gAMA chunk"; + case SPNG_EDUP_ICCP: return "duplicate iCCP chunk"; + case SPNG_EDUP_SBIT: return "duplicate sBIT chunk"; + case SPNG_EDUP_SRGB: return "duplicate sRGB chunk"; + case SPNG_EDUP_BKGD: return "duplicate bKGD chunk"; + case SPNG_EDUP_HIST: return "duplicate hIST chunk"; + case SPNG_EDUP_TRNS: return "duplicate tRNS chunk"; + case SPNG_EDUP_PHYS: return "duplicate pHYs chunk"; + case SPNG_EDUP_TIME: return "duplicate tIME chunk"; + case SPNG_EDUP_OFFS: return "duplicate oFFs chunk"; + case SPNG_EDUP_EXIF: return "duplicate eXIf chunk"; + case SPNG_ECHRM: return "invalid cHRM chunk"; + case SPNG_EPLTE_IDX: return "invalid palette (PLTE) index"; + case SPNG_ETRNS_COLOR_TYPE: return "tRNS chunk with incompatible color type"; + case SPNG_ETRNS_NO_PLTE: return "missing palette (PLTE) for tRNS chunk"; + case SPNG_EGAMA: return "invalid gAMA chunk"; + case SPNG_EICCP_NAME: return "invalid iCCP profile name"; + case SPNG_EICCP_COMPRESSION_METHOD: return "invalid iCCP compression method"; + case SPNG_ESBIT: return "invalid sBIT chunk"; + case SPNG_ESRGB: return "invalid sRGB chunk"; + case SPNG_ETEXT: return "invalid tEXt chunk"; + case SPNG_ETEXT_KEYWORD: return "invalid tEXt keyword"; + case SPNG_EZTXT: return "invalid zTXt chunk"; + case SPNG_EZTXT_COMPRESSION_METHOD: return "invalid zTXt compression method"; + case SPNG_EITXT: return "invalid iTXt chunk"; + case SPNG_EITXT_COMPRESSION_FLAG: return "invalid iTXt compression flag"; + case SPNG_EITXT_COMPRESSION_METHOD: return "invalid iTXt compression method"; + case SPNG_EITXT_LANG_TAG: return "invalid iTXt language tag"; + case SPNG_EITXT_TRANSLATED_KEY: return "invalid iTXt translated key"; + case SPNG_EBKGD_NO_PLTE: return "missing palette for bKGD chunk"; + case SPNG_EBKGD_PLTE_IDX: return "invalid palette index for bKGD chunk"; + case SPNG_EHIST_NO_PLTE: return "missing palette for hIST chunk"; + case SPNG_EPHYS: return "invalid pHYs chunk"; + case SPNG_ESPLT_NAME: return "invalid suggested palette name"; + case SPNG_ESPLT_DUP_NAME: return "duplicate suggested palette (sPLT) name"; + case SPNG_ESPLT_DEPTH: return "invalid suggested palette (sPLT) sample depth"; + case SPNG_ETIME: return "invalid tIME chunk"; + case SPNG_EOFFS: return "invalid oFFs chunk"; + case SPNG_EEXIF: return "invalid eXIf chunk"; + case SPNG_EIDAT_TOO_SHORT: return "IDAT stream too short"; + case SPNG_EIDAT_STREAM: return "IDAT stream error"; + case SPNG_EZLIB: return "zlib error"; + case SPNG_EFILTER: return "invalid scanline filter"; + case SPNG_EBUFSIZ: return "invalid buffer size"; + case SPNG_EIO: return "i/o error"; + case SPNG_EOF: return "end of file"; + case SPNG_EBUF_SET: return "buffer already set"; + case SPNG_EBADSTATE: return "non-recoverable state"; + case SPNG_EFMT: return "invalid format"; + case SPNG_EFLAGS: return "invalid flags"; + case SPNG_ECHUNKAVAIL: return "chunk not available"; + case SPNG_ENCODE_ONLY: return "encode only context"; + case SPNG_EOI: return "reached end-of-image state"; + case SPNG_ENOPLTE: return "missing PLTE for indexed image"; + case SPNG_ECHUNK_LIMITS: return "reached chunk/cache limits"; + case SPNG_EZLIB_INIT: return "zlib init error"; + case SPNG_ECHUNK_STDLEN: return "chunk exceeds maximum standard length"; + case SPNG_EINTERNAL: return "internal error"; + case SPNG_ECTXTYPE: return "invalid operation for context type"; + case SPNG_ENOSRC: return "source PNG not set"; + case SPNG_ENODST: return "PNG output not set"; + case SPNG_EOPSTATE: return "invalid operation for state"; + case SPNG_ENOTFINAL: return "PNG not finalized"; + default: return "unknown error"; + } +} + +const char *spng_version_string(void) +{ + return SPNG_VERSION_STRING; +} + +#if defined(_MSC_VER) + #pragma warning(pop) +#endif + +/* The following SIMD optimizations are derived from libpng source code. */ + +/* +* PNG Reference Library License version 2 +* +* Copyright (c) 1995-2019 The PNG Reference Library Authors. +* Copyright (c) 2018-2019 Cosmin Truta. +* Copyright (c) 2000-2002, 2004, 2006-2018 Glenn Randers-Pehrson. +* Copyright (c) 1996-1997 Andreas Dilger. +* Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc. +* +* The software is supplied "as is", without warranty of any kind, +* express or implied, including, without limitation, the warranties +* of merchantability, fitness for a particular purpose, title, and +* non-infringement. In no event shall the Copyright owners, or +* anyone distributing the software, be liable for any damages or +* other liability, whether in contract, tort or otherwise, arising +* from, out of, or in connection with the software, or the use or +* other dealings in the software, even if advised of the possibility +* of such damage. +* +* Permission is hereby granted to use, copy, modify, and distribute +* this software, or portions hereof, for any purpose, without fee, +* subject to the following restrictions: +* +* 1. The origin of this software must not be misrepresented; you +* must not claim that you wrote the original software. If you +* use this software in a product, an acknowledgment in the product +* documentation would be appreciated, but is not required. +* +* 2. Altered source versions must be plainly marked as such, and must +* not be misrepresented as being the original software. +* +* 3. This Copyright notice may not be removed or altered from any +* source or altered source distribution. +*/ + +#if defined(SPNG_X86) + +#ifndef SPNG_SSE + #define SPNG_SSE 1 +#endif + +#if defined(__GNUC__) && !defined(__clang__) + #if SPNG_SSE == 3 + #pragma GCC target("ssse3") + #elif SPNG_SSE == 4 + #pragma GCC target("sse4.1") + #else + #pragma GCC target("sse2") + #endif +#endif + +/* SSE2 optimised filter functions + * Derived from filter_neon_intrinsics.c + * + * Copyright (c) 2018 Cosmin Truta + * Copyright (c) 2016-2017 Glenn Randers-Pehrson + * Written by Mike Klein and Matt Sarett + * Derived from arm/filter_neon_intrinsics.c + * + * This code is derived from libpng source code. + * For conditions of distribution and use, see the disclaimer + * and license above. + */ + +#include +#include +#include + +/* Functions in this file look at most 3 pixels (a,b,c) to predict the 4th (d). + * They're positioned like this: + * prev: c b + * row: a d + * The Sub filter predicts d=a, Avg d=(a+b)/2, and Paeth predicts d to be + * whichever of a, b, or c is closest to p=a+b-c. + */ + +static __m128i load4(const void* p) +{ + int tmp; + memcpy(&tmp, p, sizeof(tmp)); + return _mm_cvtsi32_si128(tmp); +} + +static void store4(void* p, __m128i v) +{ + int tmp = _mm_cvtsi128_si32(v); + memcpy(p, &tmp, sizeof(int)); +} + +static __m128i load3(const void* p) +{ + uint32_t tmp = 0; + memcpy(&tmp, p, 3); + return _mm_cvtsi32_si128(tmp); +} + +static void store3(void* p, __m128i v) +{ + int tmp = _mm_cvtsi128_si32(v); + memcpy(p, &tmp, 3); +} + +static void defilter_sub3(size_t rowbytes, unsigned char *row) +{ + /* The Sub filter predicts each pixel as the previous pixel, a. + * There is no pixel to the left of the first pixel. It's encoded directly. + * That works with our main loop if we just say that left pixel was zero. + */ + size_t rb = rowbytes; + + __m128i a, d = _mm_setzero_si128(); + + while(rb >= 4) + { + a = d; d = load4(row); + d = _mm_add_epi8(d, a); + store3(row, d); + + row += 3; + rb -= 3; + } + + if(rb > 0) + { + a = d; d = load3(row); + d = _mm_add_epi8(d, a); + store3(row, d); + } +} + +static void defilter_sub4(size_t rowbytes, unsigned char *row) +{ + /* The Sub filter predicts each pixel as the previous pixel, a. + * There is no pixel to the left of the first pixel. It's encoded directly. + * That works with our main loop if we just say that left pixel was zero. + */ + size_t rb = rowbytes+4; + + __m128i a, d = _mm_setzero_si128(); + + while(rb > 4) + { + a = d; d = load4(row); + d = _mm_add_epi8(d, a); + store4(row, d); + + row += 4; + rb -= 4; + } +} + +static void defilter_avg3(size_t rowbytes, unsigned char *row, const unsigned char *prev) +{ + /* The Avg filter predicts each pixel as the (truncated) average of a and b. + * There's no pixel to the left of the first pixel. Luckily, it's + * predicted to be half of the pixel above it. So again, this works + * perfectly with our loop if we make sure a starts at zero. + */ + + size_t rb = rowbytes; + + const __m128i zero = _mm_setzero_si128(); + + __m128i b; + __m128i a, d = zero; + + while(rb >= 4) + { + __m128i avg; + b = load4(prev); + a = d; d = load4(row ); + + /* PNG requires a truncating average, so we can't just use _mm_avg_epu8 */ + avg = _mm_avg_epu8(a,b); + /* ...but we can fix it up by subtracting off 1 if it rounded up. */ + avg = _mm_sub_epi8(avg, _mm_and_si128(_mm_xor_si128(a, b), + _mm_set1_epi8(1))); + d = _mm_add_epi8(d, avg); + store3(row, d); + + prev += 3; + row += 3; + rb -= 3; + } + + if(rb > 0) + { + __m128i avg; + b = load3(prev); + a = d; d = load3(row ); + + /* PNG requires a truncating average, so we can't just use _mm_avg_epu8 */ + avg = _mm_avg_epu8(a, b); + /* ...but we can fix it up by subtracting off 1 if it rounded up. */ + avg = _mm_sub_epi8(avg, _mm_and_si128(_mm_xor_si128(a, b), + _mm_set1_epi8(1))); + + d = _mm_add_epi8(d, avg); + store3(row, d); + } +} + +static void defilter_avg4(size_t rowbytes, unsigned char *row, const unsigned char *prev) +{ + /* The Avg filter predicts each pixel as the (truncated) average of a and b. + * There's no pixel to the left of the first pixel. Luckily, it's + * predicted to be half of the pixel above it. So again, this works + * perfectly with our loop if we make sure a starts at zero. + */ + size_t rb = rowbytes+4; + + const __m128i zero = _mm_setzero_si128(); + __m128i b; + __m128i a, d = zero; + + while(rb > 4) + { + __m128i avg; + b = load4(prev); + a = d; d = load4(row ); + + /* PNG requires a truncating average, so we can't just use _mm_avg_epu8 */ + avg = _mm_avg_epu8(a,b); + /* ...but we can fix it up by subtracting off 1 if it rounded up. */ + avg = _mm_sub_epi8(avg, _mm_and_si128(_mm_xor_si128(a, b), + _mm_set1_epi8(1))); + + d = _mm_add_epi8(d, avg); + store4(row, d); + + prev += 4; + row += 4; + rb -= 4; + } +} + +/* Returns |x| for 16-bit lanes. */ +#if (SPNG_SSE >= 3) && !defined(_MSC_VER) +__attribute__((target("ssse3"))) +#endif +static __m128i abs_i16(__m128i x) +{ +#if SPNG_SSE >= 3 + return _mm_abs_epi16(x); +#else + /* Read this all as, return x<0 ? -x : x. + * To negate two's complement, you flip all the bits then add 1. + */ + __m128i is_negative = _mm_cmplt_epi16(x, _mm_setzero_si128()); + + /* Flip negative lanes. */ + x = _mm_xor_si128(x, is_negative); + + /* +1 to negative lanes, else +0. */ + x = _mm_sub_epi16(x, is_negative); + return x; +#endif +} + +/* Bytewise c ? t : e. */ +static __m128i if_then_else(__m128i c, __m128i t, __m128i e) +{ +#if SPNG_SSE >= 4 + return _mm_blendv_epi8(e, t, c); +#else + return _mm_or_si128(_mm_and_si128(c, t), _mm_andnot_si128(c, e)); +#endif +} + +static void defilter_paeth3(size_t rowbytes, unsigned char *row, const unsigned char *prev) +{ + /* Paeth tries to predict pixel d using the pixel to the left of it, a, + * and two pixels from the previous row, b and c: + * prev: c b + * row: a d + * The Paeth function predicts d to be whichever of a, b, or c is nearest to + * p=a+b-c. + * + * The first pixel has no left context, and so uses an Up filter, p = b. + * This works naturally with our main loop's p = a+b-c if we force a and c + * to zero. + * Here we zero b and d, which become c and a respectively at the start of + * the loop. + */ + size_t rb = rowbytes; + const __m128i zero = _mm_setzero_si128(); + __m128i c, b = zero, + a, d = zero; + + while(rb >= 4) + { + /* It's easiest to do this math (particularly, deal with pc) with 16-bit + * intermediates. + */ + __m128i pa,pb,pc,smallest,nearest; + c = b; b = _mm_unpacklo_epi8(load4(prev), zero); + a = d; d = _mm_unpacklo_epi8(load4(row ), zero); + + /* (p-a) == (a+b-c - a) == (b-c) */ + + pa = _mm_sub_epi16(b, c); + + /* (p-b) == (a+b-c - b) == (a-c) */ + pb = _mm_sub_epi16(a, c); + + /* (p-c) == (a+b-c - c) == (a+b-c-c) == (b-c)+(a-c) */ + pc = _mm_add_epi16(pa, pb); + + pa = abs_i16(pa); /* |p-a| */ + pb = abs_i16(pb); /* |p-b| */ + pc = abs_i16(pc); /* |p-c| */ + + smallest = _mm_min_epi16(pc, _mm_min_epi16(pa, pb)); + + /* Paeth breaks ties favoring a over b over c. */ + nearest = if_then_else(_mm_cmpeq_epi16(smallest, pa), a, + if_then_else(_mm_cmpeq_epi16(smallest, pb), b, c)); + + /* Note `_epi8`: we need addition to wrap modulo 255. */ + d = _mm_add_epi8(d, nearest); + store3(row, _mm_packus_epi16(d, d)); + + prev += 3; + row += 3; + rb -= 3; + } + + if(rb > 0) + { + /* It's easiest to do this math (particularly, deal with pc) with 16-bit + * intermediates. + */ + __m128i pa, pb, pc, smallest, nearest; + c = b; b = _mm_unpacklo_epi8(load3(prev), zero); + a = d; d = _mm_unpacklo_epi8(load3(row ), zero); + + /* (p-a) == (a+b-c - a) == (b-c) */ + pa = _mm_sub_epi16(b, c); + + /* (p-b) == (a+b-c - b) == (a-c) */ + pb = _mm_sub_epi16(a, c); + + /* (p-c) == (a+b-c - c) == (a+b-c-c) == (b-c)+(a-c) */ + pc = _mm_add_epi16(pa, pb); + + pa = abs_i16(pa); /* |p-a| */ + pb = abs_i16(pb); /* |p-b| */ + pc = abs_i16(pc); /* |p-c| */ + + smallest = _mm_min_epi16(pc, _mm_min_epi16(pa, pb)); + + /* Paeth breaks ties favoring a over b over c. */ + nearest = if_then_else(_mm_cmpeq_epi16(smallest, pa), a, + if_then_else(_mm_cmpeq_epi16(smallest, pb), b, c)); + + /* Note `_epi8`: we need addition to wrap modulo 255. */ + d = _mm_add_epi8(d, nearest); + store3(row, _mm_packus_epi16(d, d)); + } +} + +static void defilter_paeth4(size_t rowbytes, unsigned char *row, const unsigned char *prev) +{ + /* Paeth tries to predict pixel d using the pixel to the left of it, a, + * and two pixels from the previous row, b and c: + * prev: c b + * row: a d + * The Paeth function predicts d to be whichever of a, b, or c is nearest to + * p=a+b-c. + * + * The first pixel has no left context, and so uses an Up filter, p = b. + * This works naturally with our main loop's p = a+b-c if we force a and c + * to zero. + * Here we zero b and d, which become c and a respectively at the start of + * the loop. + */ + size_t rb = rowbytes+4; + + const __m128i zero = _mm_setzero_si128(); + __m128i pa, pb, pc, smallest, nearest; + __m128i c, b = zero, + a, d = zero; + + while(rb > 4) + { + /* It's easiest to do this math (particularly, deal with pc) with 16-bit + * intermediates. + */ + c = b; b = _mm_unpacklo_epi8(load4(prev), zero); + a = d; d = _mm_unpacklo_epi8(load4(row ), zero); + + /* (p-a) == (a+b-c - a) == (b-c) */ + pa = _mm_sub_epi16(b, c); + + /* (p-b) == (a+b-c - b) == (a-c) */ + pb = _mm_sub_epi16(a, c); + + /* (p-c) == (a+b-c - c) == (a+b-c-c) == (b-c)+(a-c) */ + pc = _mm_add_epi16(pa, pb); + + pa = abs_i16(pa); /* |p-a| */ + pb = abs_i16(pb); /* |p-b| */ + pc = abs_i16(pc); /* |p-c| */ + + smallest = _mm_min_epi16(pc, _mm_min_epi16(pa, pb)); + + /* Paeth breaks ties favoring a over b over c. */ + nearest = if_then_else(_mm_cmpeq_epi16(smallest, pa), a, + if_then_else(_mm_cmpeq_epi16(smallest, pb), b, c)); + + /* Note `_epi8`: we need addition to wrap modulo 255. */ + d = _mm_add_epi8(d, nearest); + store4(row, _mm_packus_epi16(d, d)); + + prev += 4; + row += 4; + rb -= 4; + } +} + +#endif /* SPNG_X86 */ + + +#if defined(SPNG_ARM) + +/* NEON optimised filter functions + * Derived from filter_neon_intrinsics.c + * + * Copyright (c) 2018 Cosmin Truta + * Copyright (c) 2014,2016 Glenn Randers-Pehrson + * Written by James Yu , October 2013. + * Based on filter_neon.S, written by Mans Rullgard, 2011. + * + * This code is derived from libpng source code. + * For conditions of distribution and use, see the disclaimer + * and license in this file. + */ + +#define png_aligncast(type, value) ((void*)(value)) +#define png_aligncastconst(type, value) ((const void*)(value)) + +/* libpng row pointers are not necessarily aligned to any particular boundary, + * however this code will only work with appropriate alignment. mips/mips_init.c + * checks for this (and will not compile unless it is done). This code uses + * variants of png_aligncast to avoid compiler warnings. + */ +#define png_ptr(type,pointer) png_aligncast(type *,pointer) +#define png_ptrc(type,pointer) png_aligncastconst(const type *,pointer) + +/* The following relies on a variable 'temp_pointer' being declared with type + * 'type'. This is written this way just to hide the GCC strict aliasing + * warning; note that the code is safe because there never is an alias between + * the input and output pointers. + */ +#define png_ldr(type,pointer)\ + (temp_pointer = png_ptr(type,pointer), *temp_pointer) + + +#if defined(_MSC_VER) && !defined(__clang__) && defined(_M_ARM64) + #include +#else + #include +#endif + +static void defilter_sub3(size_t rowbytes, unsigned char *row) +{ + unsigned char *rp = row; + unsigned char *rp_stop = row + rowbytes; + + uint8x16_t vtmp = vld1q_u8(rp); + uint8x8x2_t *vrpt = png_ptr(uint8x8x2_t, &vtmp); + uint8x8x2_t vrp = *vrpt; + + uint8x8x4_t vdest; + vdest.val[3] = vdup_n_u8(0); + + for (; rp < rp_stop;) + { + uint8x8_t vtmp1, vtmp2; + uint32x2_t *temp_pointer; + + vtmp1 = vext_u8(vrp.val[0], vrp.val[1], 3); + vdest.val[0] = vadd_u8(vdest.val[3], vrp.val[0]); + vtmp2 = vext_u8(vrp.val[0], vrp.val[1], 6); + vdest.val[1] = vadd_u8(vdest.val[0], vtmp1); + + vtmp1 = vext_u8(vrp.val[1], vrp.val[1], 1); + vdest.val[2] = vadd_u8(vdest.val[1], vtmp2); + vdest.val[3] = vadd_u8(vdest.val[2], vtmp1); + + vtmp = vld1q_u8(rp + 12); + vrpt = png_ptr(uint8x8x2_t, &vtmp); + vrp = *vrpt; + + vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[0]), 0); + rp += 3; + vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[1]), 0); + rp += 3; + vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[2]), 0); + rp += 3; + vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[3]), 0); + rp += 3; + } +} + +static void defilter_sub4(size_t rowbytes, unsigned char *row) +{ + unsigned char *rp = row; + unsigned char *rp_stop = row + rowbytes; + + uint8x8x4_t vdest; + vdest.val[3] = vdup_n_u8(0); + + for (; rp < rp_stop; rp += 16) + { + uint32x2x4_t vtmp = vld4_u32(png_ptr(uint32_t,rp)); + uint8x8x4_t *vrpt = png_ptr(uint8x8x4_t,&vtmp); + uint8x8x4_t vrp = *vrpt; + uint32x2x4_t *temp_pointer; + uint32x2x4_t vdest_val; + + vdest.val[0] = vadd_u8(vdest.val[3], vrp.val[0]); + vdest.val[1] = vadd_u8(vdest.val[0], vrp.val[1]); + vdest.val[2] = vadd_u8(vdest.val[1], vrp.val[2]); + vdest.val[3] = vadd_u8(vdest.val[2], vrp.val[3]); + + vdest_val = png_ldr(uint32x2x4_t, &vdest); + vst4_lane_u32(png_ptr(uint32_t,rp), vdest_val, 0); + } +} + +static void defilter_avg3(size_t rowbytes, unsigned char *row, const unsigned char *prev_row) +{ + unsigned char *rp = row; + const unsigned char *pp = prev_row; + unsigned char *rp_stop = row + rowbytes; + + uint8x16_t vtmp; + uint8x8x2_t *vrpt; + uint8x8x2_t vrp; + uint8x8x4_t vdest; + vdest.val[3] = vdup_n_u8(0); + + vtmp = vld1q_u8(rp); + vrpt = png_ptr(uint8x8x2_t,&vtmp); + vrp = *vrpt; + + for (; rp < rp_stop; pp += 12) + { + uint8x8_t vtmp1, vtmp2, vtmp3; + + uint8x8x2_t *vppt; + uint8x8x2_t vpp; + + uint32x2_t *temp_pointer; + + vtmp = vld1q_u8(pp); + vppt = png_ptr(uint8x8x2_t,&vtmp); + vpp = *vppt; + + vtmp1 = vext_u8(vrp.val[0], vrp.val[1], 3); + vdest.val[0] = vhadd_u8(vdest.val[3], vpp.val[0]); + vdest.val[0] = vadd_u8(vdest.val[0], vrp.val[0]); + + vtmp2 = vext_u8(vpp.val[0], vpp.val[1], 3); + vtmp3 = vext_u8(vrp.val[0], vrp.val[1], 6); + vdest.val[1] = vhadd_u8(vdest.val[0], vtmp2); + vdest.val[1] = vadd_u8(vdest.val[1], vtmp1); + + vtmp2 = vext_u8(vpp.val[0], vpp.val[1], 6); + vtmp1 = vext_u8(vrp.val[1], vrp.val[1], 1); + + vtmp = vld1q_u8(rp + 12); + vrpt = png_ptr(uint8x8x2_t,&vtmp); + vrp = *vrpt; + + vdest.val[2] = vhadd_u8(vdest.val[1], vtmp2); + vdest.val[2] = vadd_u8(vdest.val[2], vtmp3); + + vtmp2 = vext_u8(vpp.val[1], vpp.val[1], 1); + + vdest.val[3] = vhadd_u8(vdest.val[2], vtmp2); + vdest.val[3] = vadd_u8(vdest.val[3], vtmp1); + + vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[0]), 0); + rp += 3; + vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[1]), 0); + rp += 3; + vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[2]), 0); + rp += 3; + vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[3]), 0); + rp += 3; + } +} + +static void defilter_avg4(size_t rowbytes, unsigned char *row, const unsigned char *prev_row) +{ + unsigned char *rp = row; + unsigned char *rp_stop = row + rowbytes; + const unsigned char *pp = prev_row; + + uint8x8x4_t vdest; + vdest.val[3] = vdup_n_u8(0); + + for (; rp < rp_stop; rp += 16, pp += 16) + { + uint32x2x4_t vtmp; + uint8x8x4_t *vrpt, *vppt; + uint8x8x4_t vrp, vpp; + uint32x2x4_t *temp_pointer; + uint32x2x4_t vdest_val; + + vtmp = vld4_u32(png_ptr(uint32_t,rp)); + vrpt = png_ptr(uint8x8x4_t,&vtmp); + vrp = *vrpt; + vtmp = vld4_u32(png_ptrc(uint32_t,pp)); + vppt = png_ptr(uint8x8x4_t,&vtmp); + vpp = *vppt; + + vdest.val[0] = vhadd_u8(vdest.val[3], vpp.val[0]); + vdest.val[0] = vadd_u8(vdest.val[0], vrp.val[0]); + vdest.val[1] = vhadd_u8(vdest.val[0], vpp.val[1]); + vdest.val[1] = vadd_u8(vdest.val[1], vrp.val[1]); + vdest.val[2] = vhadd_u8(vdest.val[1], vpp.val[2]); + vdest.val[2] = vadd_u8(vdest.val[2], vrp.val[2]); + vdest.val[3] = vhadd_u8(vdest.val[2], vpp.val[3]); + vdest.val[3] = vadd_u8(vdest.val[3], vrp.val[3]); + + vdest_val = png_ldr(uint32x2x4_t, &vdest); + vst4_lane_u32(png_ptr(uint32_t,rp), vdest_val, 0); + } +} + +static uint8x8_t paeth_arm(uint8x8_t a, uint8x8_t b, uint8x8_t c) +{ + uint8x8_t d, e; + uint16x8_t p1, pa, pb, pc; + + p1 = vaddl_u8(a, b); /* a + b */ + pc = vaddl_u8(c, c); /* c * 2 */ + pa = vabdl_u8(b, c); /* pa */ + pb = vabdl_u8(a, c); /* pb */ + pc = vabdq_u16(p1, pc); /* pc */ + + p1 = vcleq_u16(pa, pb); /* pa <= pb */ + pa = vcleq_u16(pa, pc); /* pa <= pc */ + pb = vcleq_u16(pb, pc); /* pb <= pc */ + + p1 = vandq_u16(p1, pa); /* pa <= pb && pa <= pc */ + + d = vmovn_u16(pb); + e = vmovn_u16(p1); + + d = vbsl_u8(d, b, c); + e = vbsl_u8(e, a, d); + + return e; +} + +static void defilter_paeth3(size_t rowbytes, unsigned char *row, const unsigned char *prev_row) +{ + unsigned char *rp = row; + const unsigned char *pp = prev_row; + unsigned char *rp_stop = row + rowbytes; + + uint8x16_t vtmp; + uint8x8x2_t *vrpt; + uint8x8x2_t vrp; + uint8x8_t vlast = vdup_n_u8(0); + uint8x8x4_t vdest; + vdest.val[3] = vdup_n_u8(0); + + vtmp = vld1q_u8(rp); + vrpt = png_ptr(uint8x8x2_t,&vtmp); + vrp = *vrpt; + + for (; rp < rp_stop; pp += 12) + { + uint8x8x2_t *vppt; + uint8x8x2_t vpp; + uint8x8_t vtmp1, vtmp2, vtmp3; + uint32x2_t *temp_pointer; + + vtmp = vld1q_u8(pp); + vppt = png_ptr(uint8x8x2_t,&vtmp); + vpp = *vppt; + + vdest.val[0] = paeth_arm(vdest.val[3], vpp.val[0], vlast); + vdest.val[0] = vadd_u8(vdest.val[0], vrp.val[0]); + + vtmp1 = vext_u8(vrp.val[0], vrp.val[1], 3); + vtmp2 = vext_u8(vpp.val[0], vpp.val[1], 3); + vdest.val[1] = paeth_arm(vdest.val[0], vtmp2, vpp.val[0]); + vdest.val[1] = vadd_u8(vdest.val[1], vtmp1); + + vtmp1 = vext_u8(vrp.val[0], vrp.val[1], 6); + vtmp3 = vext_u8(vpp.val[0], vpp.val[1], 6); + vdest.val[2] = paeth_arm(vdest.val[1], vtmp3, vtmp2); + vdest.val[2] = vadd_u8(vdest.val[2], vtmp1); + + vtmp1 = vext_u8(vrp.val[1], vrp.val[1], 1); + vtmp2 = vext_u8(vpp.val[1], vpp.val[1], 1); + + vtmp = vld1q_u8(rp + 12); + vrpt = png_ptr(uint8x8x2_t,&vtmp); + vrp = *vrpt; + + vdest.val[3] = paeth_arm(vdest.val[2], vtmp2, vtmp3); + vdest.val[3] = vadd_u8(vdest.val[3], vtmp1); + + vlast = vtmp2; + + vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[0]), 0); + rp += 3; + vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[1]), 0); + rp += 3; + vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[2]), 0); + rp += 3; + vst1_lane_u32(png_ptr(uint32_t,rp), png_ldr(uint32x2_t,&vdest.val[3]), 0); + rp += 3; + } +} + +static void defilter_paeth4(size_t rowbytes, unsigned char *row, const unsigned char *prev_row) +{ + unsigned char *rp = row; + unsigned char *rp_stop = row + rowbytes; + const unsigned char *pp = prev_row; + + uint8x8_t vlast = vdup_n_u8(0); + uint8x8x4_t vdest; + vdest.val[3] = vdup_n_u8(0); + + for (; rp < rp_stop; rp += 16, pp += 16) + { + uint32x2x4_t vtmp; + uint8x8x4_t *vrpt, *vppt; + uint8x8x4_t vrp, vpp; + uint32x2x4_t *temp_pointer; + uint32x2x4_t vdest_val; + + vtmp = vld4_u32(png_ptr(uint32_t,rp)); + vrpt = png_ptr(uint8x8x4_t,&vtmp); + vrp = *vrpt; + vtmp = vld4_u32(png_ptrc(uint32_t,pp)); + vppt = png_ptr(uint8x8x4_t,&vtmp); + vpp = *vppt; + + vdest.val[0] = paeth_arm(vdest.val[3], vpp.val[0], vlast); + vdest.val[0] = vadd_u8(vdest.val[0], vrp.val[0]); + vdest.val[1] = paeth_arm(vdest.val[0], vpp.val[1], vpp.val[0]); + vdest.val[1] = vadd_u8(vdest.val[1], vrp.val[1]); + vdest.val[2] = paeth_arm(vdest.val[1], vpp.val[2], vpp.val[1]); + vdest.val[2] = vadd_u8(vdest.val[2], vrp.val[2]); + vdest.val[3] = paeth_arm(vdest.val[2], vpp.val[3], vpp.val[2]); + vdest.val[3] = vadd_u8(vdest.val[3], vrp.val[3]); + + vlast = vpp.val[3]; + + vdest_val = png_ldr(uint32x2x4_t, &vdest); + vst4_lane_u32(png_ptr(uint32_t,rp), vdest_val, 0); + } +} + +/* NEON optimised palette expansion functions + * Derived from palette_neon_intrinsics.c + * + * Copyright (c) 2018-2019 Cosmin Truta + * Copyright (c) 2017-2018 Arm Holdings. All rights reserved. + * Written by Richard Townsend , February 2017. + * + * This code is derived from libpng source code. + * For conditions of distribution and use, see the disclaimer + * and license in this file. + * + * Related: https://developer.arm.com/documentation/101964/latest/Color-palette-expansion + * + * The functions were refactored to iterate forward. + * + */ + +/* Expands a palettized row into RGBA8. */ +static uint32_t expand_palette_rgba8_neon(unsigned char *row, const unsigned char *scanline, const unsigned char *plte, uint32_t width) +{ + const uint32_t scanline_stride = 4; + const uint32_t row_stride = scanline_stride * 4; + const uint32_t count = width / scanline_stride; + const uint32_t *palette = (const uint32_t*)plte; + + if(!count) return 0; + + uint32_t i; + uint32x4_t cur; + for(i=0; i < count; i++, scanline += scanline_stride) + { + cur = vld1q_dup_u32 (palette + scanline[0]); + cur = vld1q_lane_u32(palette + scanline[1], cur, 1); + cur = vld1q_lane_u32(palette + scanline[2], cur, 2); + cur = vld1q_lane_u32(palette + scanline[3], cur, 3); + vst1q_u32((uint32_t*)(row + i * row_stride), cur); + } + + return count * scanline_stride; +} + +/* Expands a palettized row into RGB8. */ +static uint32_t expand_palette_rgb8_neon(unsigned char *row, const unsigned char *scanline, const unsigned char *plte, uint32_t width) +{ + const uint32_t scanline_stride = 8; + const uint32_t row_stride = scanline_stride * 3; + const uint32_t count = width / scanline_stride; + + if(!count) return 0; + + uint32_t i; + uint8x8x3_t cur; + for(i=0; i < count; i++, scanline += scanline_stride) + { + cur = vld3_dup_u8 (plte + 3 * scanline[0]); + cur = vld3_lane_u8(plte + 3 * scanline[1], cur, 1); + cur = vld3_lane_u8(plte + 3 * scanline[2], cur, 2); + cur = vld3_lane_u8(plte + 3 * scanline[3], cur, 3); + cur = vld3_lane_u8(plte + 3 * scanline[4], cur, 4); + cur = vld3_lane_u8(plte + 3 * scanline[5], cur, 5); + cur = vld3_lane_u8(plte + 3 * scanline[6], cur, 6); + cur = vld3_lane_u8(plte + 3 * scanline[7], cur, 7); + vst3_u8(row + i * row_stride, cur); + } + + return count * scanline_stride; +} + +#endif /* SPNG_ARM */ diff --git a/jni/libspng/spng.h b/jni/libspng/spng.h new file mode 100644 index 0000000..908ffc9 --- /dev/null +++ b/jni/libspng/spng.h @@ -0,0 +1,537 @@ +/* SPDX-License-Identifier: BSD-2-Clause */ +#ifndef SPNG_H +#define SPNG_H + +#ifdef __cplusplus +extern "C" { +#endif + +#if (defined(_WIN32) || defined(__CYGWIN__)) && !defined(SPNG_STATIC) + #if defined(SPNG__BUILD) + #define SPNG_API __declspec(dllexport) + #else + #define SPNG_API __declspec(dllimport) + #endif +#else + #define SPNG_API +#endif + +#if defined(_MSC_VER) + #define SPNG_CDECL __cdecl +#else + #define SPNG_CDECL +#endif + +#include +#include +#include + +#define SPNG_VERSION_MAJOR 0 +#define SPNG_VERSION_MINOR 7 +#define SPNG_VERSION_PATCH 3 + +enum spng_errno +{ + SPNG_IO_ERROR = -2, + SPNG_IO_EOF = -1, + SPNG_OK = 0, + SPNG_EINVAL, + SPNG_EMEM, + SPNG_EOVERFLOW, + SPNG_ESIGNATURE, + SPNG_EWIDTH, + SPNG_EHEIGHT, + SPNG_EUSER_WIDTH, + SPNG_EUSER_HEIGHT, + SPNG_EBIT_DEPTH, + SPNG_ECOLOR_TYPE, + SPNG_ECOMPRESSION_METHOD, + SPNG_EFILTER_METHOD, + SPNG_EINTERLACE_METHOD, + SPNG_EIHDR_SIZE, + SPNG_ENOIHDR, + SPNG_ECHUNK_POS, + SPNG_ECHUNK_SIZE, + SPNG_ECHUNK_CRC, + SPNG_ECHUNK_TYPE, + SPNG_ECHUNK_UNKNOWN_CRITICAL, + SPNG_EDUP_PLTE, + SPNG_EDUP_CHRM, + SPNG_EDUP_GAMA, + SPNG_EDUP_ICCP, + SPNG_EDUP_SBIT, + SPNG_EDUP_SRGB, + SPNG_EDUP_BKGD, + SPNG_EDUP_HIST, + SPNG_EDUP_TRNS, + SPNG_EDUP_PHYS, + SPNG_EDUP_TIME, + SPNG_EDUP_OFFS, + SPNG_EDUP_EXIF, + SPNG_ECHRM, + SPNG_EPLTE_IDX, + SPNG_ETRNS_COLOR_TYPE, + SPNG_ETRNS_NO_PLTE, + SPNG_EGAMA, + SPNG_EICCP_NAME, + SPNG_EICCP_COMPRESSION_METHOD, + SPNG_ESBIT, + SPNG_ESRGB, + SPNG_ETEXT, + SPNG_ETEXT_KEYWORD, + SPNG_EZTXT, + SPNG_EZTXT_COMPRESSION_METHOD, + SPNG_EITXT, + SPNG_EITXT_COMPRESSION_FLAG, + SPNG_EITXT_COMPRESSION_METHOD, + SPNG_EITXT_LANG_TAG, + SPNG_EITXT_TRANSLATED_KEY, + SPNG_EBKGD_NO_PLTE, + SPNG_EBKGD_PLTE_IDX, + SPNG_EHIST_NO_PLTE, + SPNG_EPHYS, + SPNG_ESPLT_NAME, + SPNG_ESPLT_DUP_NAME, + SPNG_ESPLT_DEPTH, + SPNG_ETIME, + SPNG_EOFFS, + SPNG_EEXIF, + SPNG_EIDAT_TOO_SHORT, + SPNG_EIDAT_STREAM, + SPNG_EZLIB, + SPNG_EFILTER, + SPNG_EBUFSIZ, + SPNG_EIO, + SPNG_EOF, + SPNG_EBUF_SET, + SPNG_EBADSTATE, + SPNG_EFMT, + SPNG_EFLAGS, + SPNG_ECHUNKAVAIL, + SPNG_ENCODE_ONLY, + SPNG_EOI, + SPNG_ENOPLTE, + SPNG_ECHUNK_LIMITS, + SPNG_EZLIB_INIT, + SPNG_ECHUNK_STDLEN, + SPNG_EINTERNAL, + SPNG_ECTXTYPE, + SPNG_ENOSRC, + SPNG_ENODST, + SPNG_EOPSTATE, + SPNG_ENOTFINAL, +}; + +enum spng_text_type +{ + SPNG_TEXT = 1, + SPNG_ZTXT = 2, + SPNG_ITXT = 3 +}; + +enum spng_color_type +{ + SPNG_COLOR_TYPE_GRAYSCALE = 0, + SPNG_COLOR_TYPE_TRUECOLOR = 2, + SPNG_COLOR_TYPE_INDEXED = 3, + SPNG_COLOR_TYPE_GRAYSCALE_ALPHA = 4, + SPNG_COLOR_TYPE_TRUECOLOR_ALPHA = 6 +}; + +enum spng_filter +{ + SPNG_FILTER_NONE = 0, + SPNG_FILTER_SUB = 1, + SPNG_FILTER_UP = 2, + SPNG_FILTER_AVERAGE = 3, + SPNG_FILTER_PAETH = 4 +}; + +enum spng_filter_choice +{ + SPNG_DISABLE_FILTERING = 0, + SPNG_FILTER_CHOICE_NONE = 8, + SPNG_FILTER_CHOICE_SUB = 16, + SPNG_FILTER_CHOICE_UP = 32, + SPNG_FILTER_CHOICE_AVG = 64, + SPNG_FILTER_CHOICE_PAETH = 128, + SPNG_FILTER_CHOICE_ALL = (8|16|32|64|128) +}; + +enum spng_interlace_method +{ + SPNG_INTERLACE_NONE = 0, + SPNG_INTERLACE_ADAM7 = 1 +}; + +/* Channels are always in byte-order */ +enum spng_format +{ + SPNG_FMT_RGBA8 = 1, + SPNG_FMT_RGBA16 = 2, + SPNG_FMT_RGB8 = 4, + + /* Partially implemented, see documentation */ + SPNG_FMT_GA8 = 16, + SPNG_FMT_GA16 = 32, + SPNG_FMT_G8 = 64, + + /* No conversion or scaling */ + SPNG_FMT_PNG = 256, + SPNG_FMT_RAW = 512 /* big-endian (everything else is host-endian) */ +}; + +enum spng_ctx_flags +{ + SPNG_CTX_IGNORE_ADLER32 = 1, /* Ignore checksum in DEFLATE streams */ + SPNG_CTX_ENCODER = 2 /* Create an encoder context */ +}; + +enum spng_decode_flags +{ + SPNG_DECODE_USE_TRNS = 1, /* Deprecated */ + SPNG_DECODE_USE_GAMA = 2, /* Deprecated */ + SPNG_DECODE_USE_SBIT = 8, /* Undocumented */ + + SPNG_DECODE_TRNS = 1, /* Apply transparency */ + SPNG_DECODE_GAMMA = 2, /* Apply gamma correction */ + SPNG_DECODE_PROGRESSIVE = 256 /* Initialize for progressive reads */ +}; + +enum spng_crc_action +{ + /* Default for critical chunks */ + SPNG_CRC_ERROR = 0, + + /* Discard chunk, invalid for critical chunks. + Since v0.6.2: default for ancillary chunks */ + SPNG_CRC_DISCARD = 1, + + /* Ignore and don't calculate checksum. + Since v0.6.2: also ignores checksums in DEFLATE streams */ + SPNG_CRC_USE = 2 +}; + +enum spng_encode_flags +{ + SPNG_ENCODE_PROGRESSIVE = 1, /* Initialize for progressive writes */ + SPNG_ENCODE_FINALIZE = 2, /* Finalize PNG after encoding image */ +}; + +struct spng_ihdr +{ + uint32_t width; + uint32_t height; + uint8_t bit_depth; + uint8_t color_type; + uint8_t compression_method; + uint8_t filter_method; + uint8_t interlace_method; +}; + +struct spng_plte_entry +{ + uint8_t red; + uint8_t green; + uint8_t blue; + + uint8_t alpha; /* Reserved for internal use */ +}; + +struct spng_plte +{ + uint32_t n_entries; + struct spng_plte_entry entries[256]; +}; + +struct spng_trns +{ + uint16_t gray; + + uint16_t red; + uint16_t green; + uint16_t blue; + + uint32_t n_type3_entries; + uint8_t type3_alpha[256]; +}; + +struct spng_chrm_int +{ + uint32_t white_point_x; + uint32_t white_point_y; + uint32_t red_x; + uint32_t red_y; + uint32_t green_x; + uint32_t green_y; + uint32_t blue_x; + uint32_t blue_y; +}; + +struct spng_chrm +{ + double white_point_x; + double white_point_y; + double red_x; + double red_y; + double green_x; + double green_y; + double blue_x; + double blue_y; +}; + +struct spng_iccp +{ + char profile_name[80]; + size_t profile_len; + char *profile; +}; + +struct spng_sbit +{ + uint8_t grayscale_bits; + uint8_t red_bits; + uint8_t green_bits; + uint8_t blue_bits; + uint8_t alpha_bits; +}; + +struct spng_text +{ + char keyword[80]; + int type; + + size_t length; + char *text; + + uint8_t compression_flag; /* iTXt only */ + uint8_t compression_method; /* iTXt, ztXt only */ + char *language_tag; /* iTXt only */ + char *translated_keyword; /* iTXt only */ +}; + +struct spng_bkgd +{ + uint16_t gray; /* Only for gray/gray alpha */ + uint16_t red; + uint16_t green; + uint16_t blue; + uint16_t plte_index; /* Only for indexed color */ +}; + +struct spng_hist +{ + uint16_t frequency[256]; +}; + +struct spng_phys +{ + uint32_t ppu_x, ppu_y; + uint8_t unit_specifier; +}; + +struct spng_splt_entry +{ + uint16_t red; + uint16_t green; + uint16_t blue; + uint16_t alpha; + uint16_t frequency; +}; + +struct spng_splt +{ + char name[80]; + uint8_t sample_depth; + uint32_t n_entries; + struct spng_splt_entry *entries; +}; + +struct spng_time +{ + uint16_t year; + uint8_t month; + uint8_t day; + uint8_t hour; + uint8_t minute; + uint8_t second; +}; + +struct spng_offs +{ + int32_t x, y; + uint8_t unit_specifier; +}; + +struct spng_exif +{ + size_t length; + char *data; +}; + +struct spng_chunk +{ + size_t offset; + uint32_t length; + uint8_t type[4]; + uint32_t crc; +}; + +enum spng_location +{ + SPNG_AFTER_IHDR = 1, + SPNG_AFTER_PLTE = 2, + SPNG_AFTER_IDAT = 8, +}; + +struct spng_unknown_chunk +{ + uint8_t type[4]; + size_t length; + void *data; + enum spng_location location; +}; + +enum spng_option +{ + SPNG_KEEP_UNKNOWN_CHUNKS = 1, + + SPNG_IMG_COMPRESSION_LEVEL, + SPNG_IMG_WINDOW_BITS, + SPNG_IMG_MEM_LEVEL, + SPNG_IMG_COMPRESSION_STRATEGY, + + SPNG_TEXT_COMPRESSION_LEVEL, + SPNG_TEXT_WINDOW_BITS, + SPNG_TEXT_MEM_LEVEL, + SPNG_TEXT_COMPRESSION_STRATEGY, + + SPNG_FILTER_CHOICE, + SPNG_CHUNK_COUNT_LIMIT, + SPNG_ENCODE_TO_BUFFER, +}; + +typedef void* SPNG_CDECL spng_malloc_fn(size_t size); +typedef void* SPNG_CDECL spng_realloc_fn(void* ptr, size_t size); +typedef void* SPNG_CDECL spng_calloc_fn(size_t count, size_t size); +typedef void SPNG_CDECL spng_free_fn(void* ptr); + +struct spng_alloc +{ + spng_malloc_fn *malloc_fn; + spng_realloc_fn *realloc_fn; + spng_calloc_fn *calloc_fn; + spng_free_fn *free_fn; +}; + +struct spng_row_info +{ + uint32_t scanline_idx; + uint32_t row_num; /* deinterlaced row index */ + int pass; + uint8_t filter; +}; + +typedef struct spng_ctx spng_ctx; + +typedef int spng_read_fn(spng_ctx *ctx, void *user, void *dest, size_t length); +typedef int spng_write_fn(spng_ctx *ctx, void *user, void *src, size_t length); + +typedef int spng_rw_fn(spng_ctx *ctx, void *user, void *dst_src, size_t length); + +SPNG_API spng_ctx *spng_ctx_new(int flags); +SPNG_API spng_ctx *spng_ctx_new2(struct spng_alloc *alloc, int flags); +SPNG_API void spng_ctx_free(spng_ctx *ctx); + +SPNG_API int spng_set_png_buffer(spng_ctx *ctx, const void *buf, size_t size); +SPNG_API int spng_set_png_stream(spng_ctx *ctx, spng_rw_fn *rw_func, void *user); +SPNG_API int spng_set_png_file(spng_ctx *ctx, FILE *file); + +SPNG_API void *spng_get_png_buffer(spng_ctx *ctx, size_t *len, int *error); + +SPNG_API int spng_set_image_limits(spng_ctx *ctx, uint32_t width, uint32_t height); +SPNG_API int spng_get_image_limits(spng_ctx *ctx, uint32_t *width, uint32_t *height); + +SPNG_API int spng_set_chunk_limits(spng_ctx *ctx, size_t chunk_size, size_t cache_size); +SPNG_API int spng_get_chunk_limits(spng_ctx *ctx, size_t *chunk_size, size_t *cache_size); + +SPNG_API int spng_set_crc_action(spng_ctx *ctx, int critical, int ancillary); + +SPNG_API int spng_set_option(spng_ctx *ctx, enum spng_option option, int value); +SPNG_API int spng_get_option(spng_ctx *ctx, enum spng_option option, int *value); + +SPNG_API int spng_decoded_image_size(spng_ctx *ctx, int fmt, size_t *len); + +/* Decode */ +SPNG_API int spng_decode_image(spng_ctx *ctx, void *out, size_t len, int fmt, int flags); + +/* Progressive decode */ +SPNG_API int spng_decode_scanline(spng_ctx *ctx, void *out, size_t len); +SPNG_API int spng_decode_row(spng_ctx *ctx, void *out, size_t len); +SPNG_API int spng_decode_chunks(spng_ctx *ctx); + +/* Encode/decode */ +SPNG_API int spng_get_row_info(spng_ctx *ctx, struct spng_row_info *row_info); + +/* Encode */ +SPNG_API int spng_encode_image(spng_ctx *ctx, const void *img, size_t len, int fmt, int flags); + +/* Progressive encode */ +SPNG_API int spng_encode_scanline(spng_ctx *ctx, const void *scanline, size_t len); +SPNG_API int spng_encode_row(spng_ctx *ctx, const void *row, size_t len); +SPNG_API int spng_encode_chunks(spng_ctx *ctx); + +SPNG_API int spng_get_ihdr(spng_ctx *ctx, struct spng_ihdr *ihdr); +SPNG_API int spng_get_plte(spng_ctx *ctx, struct spng_plte *plte); +SPNG_API int spng_get_trns(spng_ctx *ctx, struct spng_trns *trns); +SPNG_API int spng_get_chrm(spng_ctx *ctx, struct spng_chrm *chrm); +SPNG_API int spng_get_chrm_int(spng_ctx *ctx, struct spng_chrm_int *chrm_int); +SPNG_API int spng_get_gama(spng_ctx *ctx, double *gamma); +SPNG_API int spng_get_gama_int(spng_ctx *ctx, uint32_t *gama_int); +SPNG_API int spng_get_iccp(spng_ctx *ctx, struct spng_iccp *iccp); +SPNG_API int spng_get_sbit(spng_ctx *ctx, struct spng_sbit *sbit); +SPNG_API int spng_get_srgb(spng_ctx *ctx, uint8_t *rendering_intent); +SPNG_API int spng_get_text(spng_ctx *ctx, struct spng_text *text, uint32_t *n_text); +SPNG_API int spng_get_bkgd(spng_ctx *ctx, struct spng_bkgd *bkgd); +SPNG_API int spng_get_hist(spng_ctx *ctx, struct spng_hist *hist); +SPNG_API int spng_get_phys(spng_ctx *ctx, struct spng_phys *phys); +SPNG_API int spng_get_splt(spng_ctx *ctx, struct spng_splt *splt, uint32_t *n_splt); +SPNG_API int spng_get_time(spng_ctx *ctx, struct spng_time *time); +SPNG_API int spng_get_unknown_chunks(spng_ctx *ctx, struct spng_unknown_chunk *chunks, uint32_t *n_chunks); + +/* Official extensions */ +SPNG_API int spng_get_offs(spng_ctx *ctx, struct spng_offs *offs); +SPNG_API int spng_get_exif(spng_ctx *ctx, struct spng_exif *exif); + + +SPNG_API int spng_set_ihdr(spng_ctx *ctx, struct spng_ihdr *ihdr); +SPNG_API int spng_set_plte(spng_ctx *ctx, struct spng_plte *plte); +SPNG_API int spng_set_trns(spng_ctx *ctx, struct spng_trns *trns); +SPNG_API int spng_set_chrm(spng_ctx *ctx, struct spng_chrm *chrm); +SPNG_API int spng_set_chrm_int(spng_ctx *ctx, struct spng_chrm_int *chrm_int); +SPNG_API int spng_set_gama(spng_ctx *ctx, double gamma); +SPNG_API int spng_set_gama_int(spng_ctx *ctx, uint32_t gamma); +SPNG_API int spng_set_iccp(spng_ctx *ctx, struct spng_iccp *iccp); +SPNG_API int spng_set_sbit(spng_ctx *ctx, struct spng_sbit *sbit); +SPNG_API int spng_set_srgb(spng_ctx *ctx, uint8_t rendering_intent); +SPNG_API int spng_set_text(spng_ctx *ctx, struct spng_text *text, uint32_t n_text); +SPNG_API int spng_set_bkgd(spng_ctx *ctx, struct spng_bkgd *bkgd); +SPNG_API int spng_set_hist(spng_ctx *ctx, struct spng_hist *hist); +SPNG_API int spng_set_phys(spng_ctx *ctx, struct spng_phys *phys); +SPNG_API int spng_set_splt(spng_ctx *ctx, struct spng_splt *splt, uint32_t n_splt); +SPNG_API int spng_set_time(spng_ctx *ctx, struct spng_time *time); +SPNG_API int spng_set_unknown_chunks(spng_ctx *ctx, struct spng_unknown_chunk *chunks, uint32_t n_chunks); + +/* Official extensions */ +SPNG_API int spng_set_offs(spng_ctx *ctx, struct spng_offs *offs); +SPNG_API int spng_set_exif(spng_ctx *ctx, struct spng_exif *exif); + + +SPNG_API const char *spng_strerror(int err); +SPNG_API const char *spng_version_string(void); + +#ifdef __cplusplus +} +#endif + +#endif /* SPNG_H */ diff --git a/jni/osd_dji_overlay_udp.c b/jni/osd_dji_overlay_udp.c index 3c3339d..d2d6e77 100644 --- a/jni/osd_dji_overlay_udp.c +++ b/jni/osd_dji_overlay_udp.c @@ -21,6 +21,7 @@ #include "hw/dji_services.h" #include "json/osd_config.h" #include "fakehd/fakehd.h" +#include "font/font.h" #include "lz4/lz4.h" #include "toast/toast.h" #include "net/network.h" @@ -28,6 +29,7 @@ #include "msp/msp.h" #include "msp/msp_displayport.h" #include "rec/rec.h" +#include "util/display_info.h" #include "util/fs_util.h" #include "util/time_util.h" @@ -44,25 +46,11 @@ #define GOGGLES_V1_VOFFSET 575 #define GOGGLES_V2_VOFFSET 215 -#define NUM_CHARS 256 - #define INPUT_FILENAME "/dev/input/event0" #define SPLASH_STRING "OSD WAITING..." #define SHUTDOWN_STRING "SHUTTING DOWN..." #define SPLASH_KEY "show_waiting" -#define FALLBACK_FONT_PATH "/blackbox/font" -#define ENTWARE_FONT_PATH "/opt/fonts/font" -#define SDCARD_FONT_PATH "/storage/sdcard0/font" - -typedef enum { - FONT_VARIANT_GENERIC, - FONT_VARIANT_BETAFLIGHT, - FONT_VARIANT_INAV, - FONT_VARIANT_ARDUPILOT, - FONT_VARIANT_KISS_ULTRA -} font_variant_e; - #define FORCE_RENDER_HZ 2 #define TOAST_HZ 2 @@ -85,19 +73,7 @@ typedef enum { #define MAX_DISPLAY_X 60 #define MAX_DISPLAY_Y 22 -typedef struct display_info_s { - uint8_t char_width; - uint8_t char_height; - uint8_t font_width; - uint8_t font_height; - uint16_t x_offset; - uint16_t y_offset; - void *font_page_1; - void *font_page_2; -} display_info_t; - static void rec_msp_draw_complete_hook(); -static font_variant_e font_variant_from_string(char *variant_string); static volatile sig_atomic_t quit = 0; static dji_display_state_t *dji_display; @@ -117,8 +93,7 @@ static display_info_t sd_display_info = { .font_height = 54, .x_offset = 180, .y_offset = 0, - .font_page_1 = NULL, - .font_page_2 = NULL, + .fonts = {NULL, NULL, NULL, NULL}, }; static display_info_t full_display_info = { @@ -128,8 +103,7 @@ static display_info_t full_display_info = { .font_height = 36, .x_offset = 0, .y_offset = 0, - .font_page_1 = NULL, - .font_page_2 = NULL, + .fonts = {NULL, NULL, NULL, NULL}, }; static display_info_t hd_display_info = { @@ -139,8 +113,7 @@ static display_info_t hd_display_info = { .font_height = 36, .x_offset = 120, .y_offset = 80, - .font_page_1 = NULL, - .font_page_2 = NULL, + .fonts = {NULL, NULL, NULL, NULL}, }; static display_info_t overlay_display_info = { @@ -150,8 +123,7 @@ static display_info_t overlay_display_info = { .font_height = 36, .x_offset = 960, .y_offset = 450, - .font_page_1 = NULL, - .font_page_2 = NULL, + .fonts = {NULL, NULL, NULL, NULL}, }; static enum display_mode_s { @@ -179,20 +151,20 @@ static void msp_draw_character(uint32_t x, uint32_t y, uint16_t c) { /* Main rendering function: take a character_map and a display_info and draw it into a framebuffer */ static void draw_character_map(display_info_t *display_info, void* restrict fb_addr, uint16_t character_map[MAX_DISPLAY_X][MAX_DISPLAY_Y]) { - if (display_info->font_page_1 == NULL) { + if (display_info->fonts[0] == NULL) { DEBUG_PRINT("No font available, failed to draw.\n"); return; } - void *font_page_2 = display_info->font_page_2 == NULL ? display_info->font_page_1 : display_info->font_page_2; void* restrict font; for(int y = 0; y < display_info->char_height; y++) { for(int x = 0; x < display_info->char_width; x++) { uint16_t c = character_map[x][y]; if (c != 0) { - font = display_info->font_page_1; - if (c > 255) { - c = c & 0xFF; - font = font_page_2; + int page = (c & 0x300) >> 8; + c = c & 0xFF; + font = display_info->fonts[page]; + if(font == NULL) { + font = display_info->fonts[0]; } uint32_t pixel_x = (x * display_info->font_width) + display_info->x_offset; uint32_t pixel_y = (y * display_info->font_height) + display_info->y_offset; @@ -224,9 +196,9 @@ static void clear_framebuffer() { } static void draw_screen() { + clear_framebuffer(); + void *fb_addr = dji_display_get_fb_address(dji_display, which_fb); - // DJI has a backwards alpha channel - FF is transparent, 00 is opaque. - memset(fb_addr, 0x000000FF, WIDTH * HEIGHT * BYTES_PER_PIXEL); if (fakehd_is_enabled()) { fakehd_map_sd_character_map_to_hd(msp_character_map, msp_render_character_map); @@ -276,144 +248,21 @@ static void msp_callback(msp_msg_t *msp_message) displayport_process_message(display_driver, msp_message); } -/* Font helper methods */ - -static font_variant_e font_variant_from_string(char *variant_string) { - font_variant_e font_variant = FONT_VARIANT_GENERIC; - if(strncmp(current_fc_variant, "ARDU", 4) == 0) { - font_variant = FONT_VARIANT_ARDUPILOT; - } else if (strncmp(current_fc_variant, "BTFL", 4) == 0) { - font_variant = FONT_VARIANT_BETAFLIGHT; - } else if (strncmp(current_fc_variant, "INAV", 4) == 0) { - font_variant = FONT_VARIANT_INAV; - } else if (strncmp(current_fc_variant, "ULTR", 4) == 0) { - font_variant = FONT_VARIANT_KISS_ULTRA; - } - return font_variant; -} - -static void get_font_path_with_prefix(char *font_path_dest, const char *font_path, uint8_t len, uint8_t is_hd, font_variant_e font_variant, uint8_t page) -{ - char name_buf[len]; - char res_buf[len]; - - switch (font_variant) - { - case FONT_VARIANT_BETAFLIGHT: - snprintf(name_buf, len, "%s_bf", font_path); - break; - case FONT_VARIANT_INAV: - snprintf(name_buf, len, "%s_inav", font_path); - break; - case FONT_VARIANT_ARDUPILOT: - snprintf(name_buf, len, "%s_ardu", font_path); - break; - case FONT_VARIANT_KISS_ULTRA: - snprintf(name_buf, len, "%s_ultra", font_path); - break; - default: - snprintf(name_buf, len, "%s", font_path); - } - - if (is_hd) - { - // surely there's a better way... - snprintf(res_buf, len, "%s", "_hd"); - } else { - snprintf(res_buf, len, "%s", ""); - } - - if (page > 0) - { - snprintf(font_path_dest, len, "%s%s_%d.bin", name_buf, res_buf, page + 1); - } - else - { - snprintf(font_path_dest, len, "%s%s.bin", name_buf, res_buf); - } -} - -static int open_font(const char *filename, void **font, uint8_t page, uint8_t is_hd, font_variant_e font_variant) -{ - char file_path[255]; - get_font_path_with_prefix(file_path, filename, 255, is_hd, font_variant, page); - DEBUG_PRINT("Opening font: %s\n", file_path); - struct stat st; - memset(&st, 0, sizeof(st)); - stat(file_path, &st); - size_t filesize = st.st_size; - display_info_t display_info = is_hd ? hd_display_info : sd_display_info; - size_t desired_filesize = display_info.font_height * display_info.font_width * NUM_CHARS * BYTES_PER_PIXEL; - if(filesize != desired_filesize) { - if (filesize != 0) { - DEBUG_PRINT("Font was wrong size: %s %d != %d\n", file_path, filesize, desired_filesize); - } - return -1; - } - int fd = open(file_path, O_RDONLY, 0); - if (!fd) { - DEBUG_PRINT("Could not open file %s\n", file_path); - return -1; - } - void* font_data = malloc(desired_filesize); - void* mmappedData = mmap(NULL, filesize, PROT_READ, MAP_PRIVATE, fd, 0); - if (mmappedData != MAP_FAILED) { - memcpy(font_data, mmappedData, desired_filesize); - *font = font_data; - } else { - DEBUG_PRINT("Could not map font %s\n", file_path); - free(font_data); - *font = 0; - } - close(fd); - munmap(mmappedData, desired_filesize); - return 0; -} - -static void load_font(void **font_buffer, uint8_t page, uint8_t is_hd, font_variant_e font_variant) { - // Note: load_font will not replace an existing font. - if(*font_buffer == NULL) { - if (open_font(SDCARD_FONT_PATH, font_buffer, page, is_hd, font_variant) < 0) { - if (open_font(ENTWARE_FONT_PATH, font_buffer, page, is_hd, font_variant) < 0) { - open_font(FALLBACK_FONT_PATH, font_buffer, page, is_hd, font_variant); - } - } - } -} - static void load_fonts(font_variant_e font_variant) { char file_path[255]; - get_font_path_with_prefix(file_path, "FONT font", 255, 0, font_variant, 0); + get_font_path_with_extension(file_path, "FONT font", ".png", 255, 0, font_variant); toast(file_path); - load_font(&sd_display_info.font_page_1, 0, 0, font_variant); - load_font(&sd_display_info.font_page_2, 1, 0, font_variant); - load_font(&hd_display_info.font_page_1, 0, 1, font_variant); - load_font(&hd_display_info.font_page_2, 1, 1, font_variant); - load_font(&full_display_info.font_page_1, 0, 1, font_variant); - load_font(&full_display_info.font_page_2, 1, 1, font_variant); - load_font(&overlay_display_info.font_page_1, 0, 1, font_variant); - load_font(&overlay_display_info.font_page_2, 1, 1, font_variant); -} - - -static void close_fonts(display_info_t *display_info) { - if (display_info->font_page_1 != NULL) - { - free(display_info->font_page_1); - display_info->font_page_1 = NULL; - } - if (display_info->font_page_2 != NULL) - { - free(display_info->font_page_2); - display_info->font_page_2 = NULL; - } + load_font(&sd_display_info, font_variant); + load_font(&hd_display_info, font_variant); + load_font(&full_display_info, font_variant); + load_font(&overlay_display_info, font_variant); } static void close_all_fonts() { - close_fonts(&sd_display_info); - close_fonts(&hd_display_info); - close_fonts(&overlay_display_info); - close_fonts(&full_display_info); + close_font(&sd_display_info); + close_font(&hd_display_info); + close_font(&overlay_display_info); + close_font(&full_display_info); } static void msp_set_options(uint8_t font_num, msp_hd_options_e is_hd) { @@ -463,8 +312,8 @@ void dji_display_open_framebuffer_injected(dji_display_state_t *display_state, d display_state->pb_0->voffset = GOGGLES_V1_VOFFSET; display_state->pb_0->hoffset = 0; - // On Goggles V1, the UI and video are in Z-Order 1. On Goggles V2, they're in Z-Order 4. - // Unfortunately, this means we cannot draw below the DJI UI on Goggles V1. But, on Goggles V2 we get what we want. + // On Goggles V1, the UI and video are in Z-Order 1. + // On Goggles V2, they're in Z-Order 4, but we inline patch them to Z-Order 1 (see displayport_osd_shim.c) display_state->pb_0->order = 2; @@ -696,6 +545,7 @@ void osd_directfb(duss_disp_instance_handle_t *disp, duss_hal_obj_handle_t ion_h load_fakehd_config(); rec_load_config(); check_is_au_overlay_enabled(); + convert_bin_fonts(SDCARD_FONT_PATH); uint8_t is_v2_goggles = dji_goggles_are_v2(); DEBUG_PRINT("Detected DJI goggles %s\n", is_v2_goggles ? "V2" : "V1"); diff --git a/jni/util/display_info.h b/jni/util/display_info.h new file mode 100644 index 0000000..60c65d6 --- /dev/null +++ b/jni/util/display_info.h @@ -0,0 +1,16 @@ +#pragma once + +#include + +#define NUM_CHARS 256 +#define NUM_FONT_PAGES 4 + +typedef struct display_info_s { + uint8_t char_width; + uint8_t char_height; + uint8_t font_width; + uint8_t font_height; + uint16_t x_offset; + uint16_t y_offset; + void *fonts[NUM_FONT_PAGES]; +} display_info_t; \ No newline at end of file diff --git a/jni/util/fs_util.c b/jni/util/fs_util.c index c7f6896..f4c0987 100644 --- a/jni/util/fs_util.c +++ b/jni/util/fs_util.c @@ -2,6 +2,7 @@ #include #include #include +#include #include #include #include @@ -33,7 +34,7 @@ void *open_dict(int dict_version, int *size) { size_t filesize = st.st_size; int fd = open(file_path, O_RDONLY, 0); if (!fd) { - return -1; + return NULL; } void* dict = malloc(filesize); void* mmappedData = mmap(NULL, filesize, PROT_READ, MAP_PRIVATE, fd, 0);