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bmpimage.c
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bmpimage.c
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/* This is dvipdfmx, an eXtended version of dvipdfm by Mark A. Wicks.
Copyright (C) 2002-2015 by Jin-Hwan Cho and Shunsaku Hirata,
the dvipdfmx project team.
Copyright (C) 1998, 1999 by Mark A. Wicks <mwicks@kettering.edu>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "libtexpdf.h"
/*
* BMP SUPPORT: Not fully supported.
* Unsupported features: Transparency, etc.
*/
#define DIB_FILE_HEADER_SIZE 14
#define DIB_CORE_HEADER_SIZE 12
#define DIB_INFO_HEADER_SIZE 40
#define DIB_INFO_HEADER_SIZE2 64
#define DIB_INFO_HEADER_SIZE4 108
#define DIB_INFO_HEADER_SIZE5 124
#define DIB_COMPRESS_NONE 0
#define DIB_COMPRESS_RLE8 1
#define DIB_COMPRESS_RLE4 2
#define DIB_HEADER_SIZE_MAX (DIB_FILE_HEADER_SIZE+DIB_INFO_HEADER_SIZE5)
struct hdr_info {
unsigned int offset;
unsigned int hsize;
unsigned int width;
int height;
int compression;
unsigned short bit_count; /* Bits per pix */
int psize; /* Bytes per palette color: 3 for OS2, 4 for Win */
unsigned int x_pix_per_meter;
unsigned int y_pix_per_meter;
};
static int read_header (FILE *fp, struct hdr_info *hdr);
static int read_raster_rle8 (unsigned char *data_ptr,
int width, int height, FILE *fp);
static int read_raster_rle4 (unsigned char *data_ptr,
int width, int height, FILE *fp);
int
texpdf_check_for_bmp (FILE *fp)
{
unsigned char sigbytes[2];
if (!fp)
return 0;
rewind(fp);
if (fread(sigbytes, 1, sizeof(sigbytes), fp) != sizeof(sigbytes) ||
sigbytes[0] != 'B' || sigbytes[1] != 'M')
return 0;
return 1;
}
static void
get_density (double *xdensity, double *ydensity, struct hdr_info *hdr)
{
if (compat_mode)
*xdensity = *ydensity = 72.0 / 100.0;
else if (hdr->x_pix_per_meter > 0 && hdr->y_pix_per_meter > 0) { /* 0 for undefined. FIXME */
*xdensity = 72.0 / (hdr->x_pix_per_meter * 0.0254);
*ydensity = 72.0 / (hdr->y_pix_per_meter * 0.0254);
} else {
*xdensity = 1.0;
*ydensity = 1.0;
}
}
int
texpdf_bmp_get_bbox (FILE *fp, int *width, int *height,
double *xdensity, double *ydensity)
{
int r;
struct hdr_info hdr;
rewind(fp);
r = read_header(fp, &hdr);
*width = hdr.width;
*height = hdr.height < 0 ? -hdr.height : hdr.height;
get_density(xdensity, ydensity, &hdr);
return r;
}
int
bmp_include_image (pdf_ximage *ximage, FILE *fp)
{
pdf_obj *stream, *stream_dict, *colorspace;
ximage_info info;
struct hdr_info hdr;
int num_palette, flip;
int i;
texpdf_ximage_init_image_info(&info);
stream = stream_dict = colorspace = NULL;
rewind(fp);
if (read_header(fp, &hdr) < 0)
return -1;
get_density(&info.xdensity, &info.ydensity, &hdr);
info.width = hdr.width;
info.height = hdr.height;
if (info.height < 0) {
info.height = -info.height;
flip = 0;
} else {
flip = 1;
}
if (hdr.bit_count < 24) {
if (hdr.bit_count != 1 &&
hdr.bit_count != 4 && hdr.bit_count != 8) {
WARN("Unsupported palette size: %ld", hdr.bit_count);
return -1;
}
num_palette = (hdr.offset - hdr.hsize - DIB_FILE_HEADER_SIZE) / hdr.psize;
info.bits_per_component = hdr.bit_count;
info.num_components = 1;
} else if (hdr.bit_count == 24) { /* full color */
num_palette = 1; /* dummy */
info.bits_per_component = 8;
info.num_components = 3;
} else {
WARN("Unkown/Unsupported BMP bitCount value: %ld", hdr.bit_count);
return -1;
}
if (info.width == 0 || info.height == 0 || num_palette < 1) {
WARN("Invalid BMP file: width=%ld, height=%ld, #palette=%d",
info.width, info.height, num_palette);
return -1;
}
/* Start reading raster data */
stream = texpdf_new_stream(STREAM_COMPRESS);
stream_dict = texpdf_stream_dict(stream);
/* Color space: Indexed or DeviceRGB */
if (hdr.bit_count < 24) {
pdf_obj *lookup;
unsigned char *palette, bgrq[4];
palette = NEW(num_palette*3+1, unsigned char);
for (i = 0; i < num_palette; i++) {
if (fread(bgrq, 1, hdr.psize, fp) != hdr.psize) {
WARN("Reading file failed...");
RELEASE(palette);
return -1;
}
/* BGR data */
palette[3*i ] = bgrq[2];
palette[3*i+1] = bgrq[1];
palette[3*i+2] = bgrq[0];
}
lookup = texpdf_new_string(palette, num_palette*3);
RELEASE(palette);
colorspace = texpdf_new_array();
texpdf_add_array(colorspace, texpdf_new_name("Indexed"));
texpdf_add_array(colorspace, texpdf_new_name("DeviceRGB"));
texpdf_add_array(colorspace, texpdf_new_number(num_palette-1));
texpdf_add_array(colorspace, lookup);
} else {
colorspace = texpdf_new_name("DeviceRGB");
}
texpdf_add_dict(stream_dict, texpdf_new_name("ColorSpace"), colorspace);
/* Raster data of BMP is four-byte aligned. */
{
int rowbytes, n;
unsigned char *p, *stream_data_ptr = NULL;
rowbytes = (info.width * hdr.bit_count + 7) / 8;
seek_absolute(fp, hdr.offset);
if (hdr.compression == DIB_COMPRESS_NONE) {
int dib_rowbytes;
int padding;
padding = (rowbytes % 4) ? 4 - (rowbytes % 4) : 0;
dib_rowbytes = rowbytes + padding;
stream_data_ptr = NEW(rowbytes*info.height + padding, unsigned char);
for (n = 0; n < info.height; n++) {
p = stream_data_ptr + n * rowbytes;
if (fread(p, 1, dib_rowbytes, fp) != dib_rowbytes) {
WARN("Reading BMP raster data failed...");
texpdf_release_obj(stream);
RELEASE(stream_data_ptr);
return -1;
}
}
} else if (hdr.compression == DIB_COMPRESS_RLE8) {
stream_data_ptr = NEW(rowbytes*info.height, unsigned char);
if (read_raster_rle8(stream_data_ptr, info.width, info.height, fp) < 0) {
WARN("Reading BMP raster data failed...");
texpdf_release_obj(stream);
RELEASE(stream_data_ptr);
return -1;
}
} else if (hdr.compression == DIB_COMPRESS_RLE4) {
stream_data_ptr = NEW(rowbytes*info.height, unsigned char);
if (read_raster_rle4(stream_data_ptr, info.width, info.height, fp) < 0) {
WARN("Reading BMP raster data failed...");
texpdf_release_obj(stream);
RELEASE(stream_data_ptr);
return -1;
}
} else {
WARN("Unknown/Unsupported compression type for BMP image: %ld", hdr.compression);
texpdf_release_obj(stream);
return -1;
}
/* gbr --> rgb */
if (hdr.bit_count == 24) {
for (n = 0; n < info.width * info.height * 3; n += 3) {
unsigned char g;
g = stream_data_ptr[n];
stream_data_ptr[n ] = stream_data_ptr[n+2];
stream_data_ptr[n+2] = g;
}
}
if (flip) {
for (n = info.height - 1; n >= 0; n--) {
p = stream_data_ptr + n * rowbytes;
texpdf_add_stream(stream, p, rowbytes);
}
} else {
texpdf_add_stream(stream, stream_data_ptr, rowbytes*info.height);
}
RELEASE(stream_data_ptr);
}
texpdf_ximage_set_image(ximage, &info, stream);
return 0;
}
static int
read_header (FILE *fp, struct hdr_info *hdr)
{
unsigned char buf[DIB_HEADER_SIZE_MAX+4];
unsigned char *p;
p = buf;
if (fread(buf, 1, DIB_FILE_HEADER_SIZE + 4, fp)
!= DIB_FILE_HEADER_SIZE + 4) {
WARN("Could not read BMP file header...");
return -1;
}
if (p[0] != 'B' || p[1] != 'M') {
WARN("File not starting with \'B\' \'M\'... Not a BMP file?");
return -1;
}
p += 2;
#define ULONG_LE(b) ((b)[0] + ((b)[1] << 8) +\
((b)[2] << 16) + ((b)[3] << 24))
#define USHORT_LE(b) ((b)[0] + ((b)[1] << 8))
/* fsize = ULONG_LE(p); */ p += 4;
if (ULONG_LE(p) != 0) {
WARN("Not a BMP file???");
return -1;
}
p += 4;
hdr->offset = ULONG_LE(p); p += 4;
/* info header */
hdr->hsize = ULONG_LE(p); p += 4;
if (fread(p, sizeof(char), hdr->hsize - 4, fp) != hdr->hsize - 4) {
WARN("Could not read BMP file header...");
return -1;
}
switch (hdr->hsize) {
case DIB_CORE_HEADER_SIZE:
hdr->width = USHORT_LE(p); p += 2;
hdr->height = USHORT_LE(p); p += 2;
hdr->x_pix_per_meter = 0; /* undefined. FIXME */
hdr->y_pix_per_meter = 0; /* undefined. FIXME */
if (USHORT_LE(p) != 1) {
WARN("Unknown bcPlanes value in BMP COREHEADER.");
return -1;
}
p += 2;
hdr->bit_count = USHORT_LE(p); p += 2;
hdr->compression = DIB_COMPRESS_NONE;
hdr->psize = 3;
break;
case DIB_INFO_HEADER_SIZE :
case DIB_INFO_HEADER_SIZE2:
case DIB_INFO_HEADER_SIZE4:
case DIB_INFO_HEADER_SIZE5:
hdr->width = ULONG_LE(p); p += 4;
hdr->height = ULONG_LE(p); p += 4;
if (USHORT_LE(p) != 1) {
WARN("Unknown biPlanes value in BMP INFOHEADER.");
return -1;
}
p += 2;
hdr->bit_count = USHORT_LE(p); p += 2;
hdr->compression = ULONG_LE(p); p += 4;
/* ignore biSizeImage */ p += 4;
hdr->x_pix_per_meter = ULONG_LE(p); p += 4;
hdr->y_pix_per_meter = ULONG_LE(p); p += 4;
hdr->psize = 4;
break;
default:
WARN("Unknown BMP header type.");
return -1;
}
return 0;
}
static int
read_raster_rle8 (unsigned char *data_ptr,
int width, int height, FILE *fp)
{
int count = 0;
unsigned char *p, b0, b1;
int h, v, rowbytes;
int eol, eoi;
p = data_ptr;
rowbytes = width;
memset(data_ptr, 0, rowbytes*height);
for (v = 0, eoi = 0; v < height && !eoi; v++) {
for (h = 0, eol = 0; h < width && !eol; ) {
b0 = get_unsigned_byte(fp);
b1 = get_unsigned_byte(fp);
count += 2;
p = data_ptr + v * rowbytes + h;
if (b0 == 0x00) {
switch (b1) {
case 0x00: /* EOL */
eol = 1;
break;
case 0x01: /* EOI */
eoi = 1;
break;
case 0x02:
h += get_unsigned_byte(fp);
v += get_unsigned_byte(fp);
count += 2;
break;
default:
h += b1;
if (h > width) {
WARN("RLE decode failed...");
return -1;
}
if (fread(p, 1, b1, fp) != b1)
return -1;
count += b1;
if (b1 % 2) {
get_unsigned_byte(fp);
count++;
}
break;
}
} else {
h += b0;
if (h > width) {
WARN("RLE decode failed...");
return -1;
}
memset(p, b1, b0);
}
}
/* Check for EOL and EOI marker */
if (!eol && !eoi) {
b0 = get_unsigned_byte(fp);
b1 = get_unsigned_byte(fp);
if (b0 != 0x00) {
WARN("RLE decode failed...");
return -1;
} else if (b1 == 0x01) {
eoi = 1;
} else if (b1 != 0x00) {
WARN("RLE decode failed...");
return -1;
}
}
/* next row ... */
}
return count;
}
static int
read_raster_rle4 (unsigned char *data_ptr,
int width, int height, FILE *fp)
{
int count = 0;
unsigned char *p, b0, b1, b;
int h, v, rowbytes;
int eol, eoi, i, nbytes;
p = data_ptr;
rowbytes = (width + 1) / 2;
memset(data_ptr, 0, rowbytes*height);
for (v = 0, eoi = 0; v < height && !eoi; v++) {
for (h = 0, eol = 0; h < width && !eol; ) {
b0 = get_unsigned_byte(fp);
b1 = get_unsigned_byte(fp);
count += 2;
p = data_ptr + v * rowbytes + (h / 2);
if (b0 == 0x00) {
switch (b1) {
case 0x00: /* EOL */
eol = 1;
break;
case 0x01: /* EOI */
eoi = 1;
break;
case 0x02:
h += get_unsigned_byte(fp);
v += get_unsigned_byte(fp);
count += 2;
break;
default:
if (h + b1 > width) {
WARN("RLE decode failed...");
return -1;
}
nbytes = (b1 + 1)/2;
if (h % 2) { /* starting at hi-nib */
for (i = 0; i < nbytes; i++) {
b = get_unsigned_byte(fp);
*p++ |= (b >> 4) & 0x0f;
*p = (b << 4) & 0xf0;
}
} else {
if (fread(p, 1, nbytes, fp) != nbytes) {
return -1;
}
}
h += b1;
count += nbytes;
if (nbytes % 2) {
get_unsigned_byte(fp);
count++;
}
break;
}
} else {
if (h + b0 > width) {
WARN("RLE decode failed...");
return -1;
}
if (h % 2) {
*p++ = (b1 >> 4) & 0x0f;
b1 = ((b1 << 4) & 0xf0)|((b1 >> 4) & 0x0f);
b0--;
h++;
}
nbytes = (b0 + 1)/2;
memset(p, b1, nbytes);
h += b0;
if (h % 2)
p[nbytes-1] &= 0xf0;
}
}
/* Check for EOL and EOI marker */
if (!eol && !eoi) {
b0 = get_unsigned_byte(fp);
b1 = get_unsigned_byte(fp);
if (b0 != 0x00) {
WARN("No EOL/EOI marker. RLE decode failed...");
return -1;
} else if (b1 == 0x01) {
eoi = 1;
} else if (b1 != 0x00) {
WARN("No EOL/EOI marker. RLE decode failed...");
return -1;
}
}
/* next row ... */
}
return count;
}