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aseprite_decoder.cpp
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// Aseprite Document IO Library
// Copyright (c) 2018-2023 Igara Studio S.A.
// Copyright (c) 2001-2018 David Capello
//
// This file is released under the terms of the MIT license.
// Read LICENSE.txt for more information.
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "dio/aseprite_decoder.h"
#include "base/cfile.h"
#include "base/exception.h"
#include "base/file_handle.h"
#include "base/fs.h"
#include "base/mask_shift.h"
#include "dio/aseprite_common.h"
#include "dio/decode_delegate.h"
#include "dio/file_interface.h"
#include "dio/pixel_io.h"
#include "doc/doc.h"
#include "doc/util.h"
#include "fixmath/fixmath.h"
#include "fmt/format.h"
#include "gfx/color_space.h"
#include "zlib.h"
#include <cstdio>
#include <vector>
namespace dio {
bool AsepriteDecoder::decode()
{
bool ignore_old_color_chunks = false;
AsepriteHeader header;
if (!readHeader(&header)) {
delegate()->error("Error reading header");
return false;
}
if (header.depth != 32 &&
header.depth != 16 &&
header.depth != 8) {
delegate()->error(
fmt::format("Invalid color depth {0}",
header.depth));
return false;
}
if (header.width < 1 || header.height < 1) {
delegate()->error(
fmt::format("Invalid sprite size {0}x{1}",
header.width, header.height));
return false;
}
// Create the new sprite
std::unique_ptr<doc::Sprite> sprite(
std::make_unique<doc::Sprite>(doc::ImageSpec(header.depth == 32 ? doc::ColorMode::RGB:
header.depth == 16 ? doc::ColorMode::GRAYSCALE:
doc::ColorMode::INDEXED,
header.width,
header.height),
header.ncolors));
// Set frames and speed
sprite->setTotalFrames(doc::frame_t(header.frames));
sprite->setDurationForAllFrames(header.speed);
// Set transparent entry
sprite->setTransparentColor(header.transparent_index);
// Set pixel ratio
sprite->setPixelRatio(doc::PixelRatio(header.pixel_width, header.pixel_height));
// Set grid bounds
sprite->setGridBounds(gfx::Rect(header.grid_x, header.grid_y,
header.grid_width, header.grid_height));
// Prepare variables for layer chunks
doc::Layer* last_layer = sprite->root();
doc::WithUserData* last_object_with_user_data = sprite.get();
doc::Cel* last_cel = nullptr;
auto tag_it = sprite->tags().begin();
auto tag_end = sprite->tags().end();
m_allLayers.clear();
int current_level = -1;
AsepriteExternalFiles extFiles;
// Just one frame?
doc::frame_t nframes = sprite->totalFrames();
if (nframes > 1 && delegate()->decodeOneFrame())
nframes = 1;
// Read frame by frame to end-of-file
for (doc::frame_t frame=0; frame<nframes; ++frame) {
// Start frame position
size_t frame_pos = f()->tell();
delegate()->progress((float)frame_pos / (float)header.size);
// Read frame header
AsepriteFrameHeader frame_header;
readFrameHeader(&frame_header);
// Correct frame type
if (frame_header.magic == ASE_FILE_FRAME_MAGIC) {
// Use frame-duration field?
if (frame_header.duration > 0)
sprite->setFrameDuration(frame, frame_header.duration);
// Read chunks
for (uint32_t c=0; c<frame_header.chunks; c++) {
// Start chunk position
size_t chunk_pos = f()->tell();
delegate()->progress((float)chunk_pos / (float)header.size);
// Read chunk information
int chunk_size = read32();
int chunk_type = read16();
switch (chunk_type) {
case ASE_FILE_CHUNK_FLI_COLOR:
case ASE_FILE_CHUNK_FLI_COLOR2:
if (!ignore_old_color_chunks) {
doc::Palette* prevPal = sprite->palette(frame);
std::unique_ptr<doc::Palette> pal(
chunk_type == ASE_FILE_CHUNK_FLI_COLOR ?
readColorChunk(prevPal, frame):
readColor2Chunk(prevPal, frame));
if (prevPal->countDiff(pal.get(), NULL, NULL) > 0)
sprite->setPalette(pal.get(), true);
}
break;
case ASE_FILE_CHUNK_PALETTE: {
doc::Palette* prevPal = sprite->palette(frame);
std::unique_ptr<doc::Palette> pal(
readPaletteChunk(prevPal, frame));
if (prevPal->countDiff(pal.get(), NULL, NULL) > 0)
sprite->setPalette(pal.get(), true);
ignore_old_color_chunks = true;
break;
}
case ASE_FILE_CHUNK_LAYER: {
doc::Layer* newLayer =
readLayerChunk(&header, sprite.get(),
&last_layer,
¤t_level);
if (newLayer) {
m_allLayers.push_back(newLayer);
last_object_with_user_data = newLayer;
}
else {
// Add a null layer only to match the "layer index" in cel chunk
m_allLayers.push_back(nullptr);
last_object_with_user_data = nullptr;
}
break;
}
case ASE_FILE_CHUNK_CEL: {
doc::Cel* cel =
readCelChunk(sprite.get(), frame,
sprite->pixelFormat(), &header,
chunk_pos+chunk_size);
if (cel) {
last_cel = cel;
last_object_with_user_data = cel->data();
}
else {
last_object_with_user_data = nullptr;
}
break;
}
case ASE_FILE_CHUNK_CEL_EXTRA: {
if (last_cel)
readCelExtraChunk(last_cel);
break;
}
case ASE_FILE_CHUNK_COLOR_PROFILE: {
readColorProfile(sprite.get());
break;
}
case ASE_FILE_CHUNK_EXTERNAL_FILE:
readExternalFiles(extFiles);
// Tile management plugin
if (!extFiles.empty()) {
std::string fn = extFiles.tileManagementPlugin();
if (!fn.empty())
sprite->setTileManagementPlugin(fn);
}
break;
case ASE_FILE_CHUNK_MASK: {
doc::Mask* mask = readMaskChunk();
if (mask)
delete mask; // TODO add the mask in some place?
else
delegate()->error("Warning: Cannot load a mask chunk");
break;
}
case ASE_FILE_CHUNK_PATH:
// Ignore
break;
case ASE_FILE_CHUNK_TAGS:
readTagsChunk(&sprite->tags());
tag_it = sprite->tags().begin();
tag_end = sprite->tags().end();
if (tag_it != tag_end)
last_object_with_user_data = *tag_it;
else
last_object_with_user_data = nullptr;
break;
case ASE_FILE_CHUNK_SLICES: {
readSlicesChunk(sprite->slices());
break;
}
case ASE_FILE_CHUNK_SLICE: {
doc::Slice* slice = readSliceChunk(sprite->slices());
if (slice)
last_object_with_user_data = slice;
break;
}
case ASE_FILE_CHUNK_USER_DATA: {
doc::UserData userData;
readUserDataChunk(&userData, extFiles);
if (last_object_with_user_data) {
last_object_with_user_data->setUserData(userData);
switch (last_object_with_user_data->type()) {
case doc::ObjectType::Tag:
// Tags are a special case, user data for tags come
// all together (one next to other) after the tags
// chunk, in the same order:
//
// * TAGS CHUNK (TAG1, TAG2, ..., TAGn)
// * USER DATA CHUNK FOR TAG1
// * USER DATA CHUNK FOR TAG2
// * ...
// * USER DATA CHUNK FOR TAGn
//
// So here we expect that the next user data chunk
// will correspond to the next tag in the tags
// collection.
++tag_it;
if (tag_it != tag_end)
last_object_with_user_data = *tag_it;
else
last_object_with_user_data = nullptr;
break;
case doc::ObjectType::Tileset:
// Read tiles user datas.
// TODO: Should we refactor how tile user data is handled so we can actually
// decode this user data chunks the same way as the user data chunks for
// the tags?
doc::Tileset* tileset = static_cast<doc::Tileset*>(last_object_with_user_data);
readTilesData(tileset, extFiles);
last_object_with_user_data = nullptr;
break;
}
}
break;
}
case ASE_FILE_CHUNK_TILESET: {
doc::Tileset* tileset = readTilesetChunk(sprite.get(), &header, extFiles);
if (tileset)
last_object_with_user_data = tileset;
break;
}
default:
delegate()->incompatibilityError(
fmt::format("Warning: Unsupported chunk type {0} (skipping)", chunk_type));
break;
}
// Skip chunk size
f()->seek(chunk_pos+chunk_size);
}
}
// Skip frame size
f()->seek(frame_pos+frame_header.size);
if (delegate()->isCanceled())
break;
}
delegate()->onSprite(sprite.release());
return true;
}
bool AsepriteDecoder::readHeader(AsepriteHeader* header)
{
size_t headerPos = f()->tell();
header->size = read32();
header->magic = read16();
// Developers can open any .ase file
#if !defined(ENABLE_DEVMODE)
if (header->magic != ASE_FILE_MAGIC)
return false;
#endif
header->frames = read16();
header->width = read16();
header->height = read16();
header->depth = read16();
header->flags = read32();
header->speed = read16();
header->next = read32();
header->frit = read32();
header->transparent_index = read8();
header->ignore[0] = read8();
header->ignore[1] = read8();
header->ignore[2] = read8();
header->ncolors = read16();
header->pixel_width = read8();
header->pixel_height = read8();
header->grid_x = (int16_t)read16();
header->grid_y = (int16_t)read16();
header->grid_width = read16();
header->grid_height = read16();
if (header->depth != 8) // Transparent index only valid for indexed images
header->transparent_index = 0;
if (header->ncolors == 0) // 0 means 256 (old .ase files)
header->ncolors = 256;
if (header->pixel_width == 0 ||
header->pixel_height == 0) {
header->pixel_width = 1;
header->pixel_height = 1;
}
#if defined(ENABLE_DEVMODE)
// This is useful to read broken .ase files
if (header->magic != ASE_FILE_MAGIC) {
header->frames = 256; // Frames number might be not enought for some files
header->width = 1024; // Size doesn't matter, the sprite can be crop
header->height = 1024;
}
#endif
f()->seek(headerPos+128);
return true;
}
void AsepriteDecoder::readFrameHeader(AsepriteFrameHeader* frame_header)
{
frame_header->size = read32();
frame_header->magic = read16();
frame_header->chunks = read16();
frame_header->duration = read16();
readPadding(2);
uint32_t nchunks = read32();
if (frame_header->chunks == 0xFFFF &&
frame_header->chunks < nchunks)
frame_header->chunks = nchunks;
}
void AsepriteDecoder::readPadding(int bytes)
{
for (int c=0; c<bytes; c++)
read8();
}
std::string AsepriteDecoder::readString()
{
int length = read16();
if (length == EOF)
return "";
std::string string;
string.reserve(length+1);
for (int c=0; c<length; c++)
string.push_back(read8());
return string;
}
float AsepriteDecoder::readFloat()
{
int b1, b2, b3, b4;
if ((b1 = read8()) == EOF)
return EOF;
if ((b2 = read8()) == EOF)
return EOF;
if ((b3 = read8()) == EOF)
return EOF;
if ((b4 = read8()) == EOF)
return EOF;
// Little endian.
int v = ((b4 << 24) | (b3 << 16) | (b2 << 8) | b1);
return *reinterpret_cast<float*>(&v);
}
double AsepriteDecoder::readDouble()
{
int b1, b2, b3, b4, b5, b6, b7, b8;
if ((b1 = read8()) == EOF)
return EOF;
if ((b2 = read8()) == EOF)
return EOF;
if ((b3 = read8()) == EOF)
return EOF;
if ((b4 = read8()) == EOF)
return EOF;
if ((b5 = read8()) == EOF)
return EOF;
if ((b6 = read8()) == EOF)
return EOF;
if ((b7 = read8()) == EOF)
return EOF;
if ((b8 = read8()) == EOF)
return EOF;
// Little endian.
long long v = (((long long)b8 << 56) |
((long long)b7 << 48) |
((long long)b6 << 40) |
((long long)b5 << 32) |
((long long)b4 << 24) |
((long long)b3 << 16) |
((long long)b2 << 8) |
(long long)b1);
return *reinterpret_cast<double*>(&v);
}
doc::Palette* AsepriteDecoder::readColorChunk(doc::Palette* prevPal,
doc::frame_t frame)
{
int i, c, r, g, b, packets, skip, size;
doc::Palette* pal = new doc::Palette(*prevPal);
pal->setFrame(frame);
packets = read16(); // Number of packets
skip = 0;
// Read all packets
for (i=0; i<packets; i++) {
skip += read8();
size = read8();
if (!size) size = 256;
for (c=skip; c<skip+size; c++) {
r = read8();
g = read8();
b = read8();
pal->setEntry(c, doc::rgba(doc::scale_6bits_to_8bits(r),
doc::scale_6bits_to_8bits(g),
doc::scale_6bits_to_8bits(b), 255));
}
}
return pal;
}
doc::Palette* AsepriteDecoder::readColor2Chunk(doc::Palette* prevPal,
doc::frame_t frame)
{
int i, c, r, g, b, packets, skip, size;
doc::Palette* pal = new doc::Palette(*prevPal);
pal->setFrame(frame);
packets = read16(); // Number of packets
skip = 0;
// Read all packets
for (i=0; i<packets; i++) {
skip += read8();
size = read8();
if (!size) size = 256;
for (c=skip; c<skip+size; c++) {
r = read8();
g = read8();
b = read8();
pal->setEntry(c, doc::rgba(r, g, b, 255));
}
}
return pal;
}
doc::Palette* AsepriteDecoder::readPaletteChunk(doc::Palette* prevPal,
doc::frame_t frame)
{
doc::Palette* pal = new doc::Palette(*prevPal);
pal->setFrame(frame);
int newSize = read32();
int from = read32();
int to = read32();
readPadding(8);
if (newSize > 0)
pal->resize(newSize);
for (int c=from; c<=to; ++c) {
int flags = read16();
int r = read8();
int g = read8();
int b = read8();
int a = read8();
pal->setEntry(c, doc::rgba(r, g, b, a));
// Skip name
if (flags & ASE_PALETTE_FLAG_HAS_NAME) {
std::string name = readString();
// Ignore color entry name
}
}
return pal;
}
doc::Layer* AsepriteDecoder::readLayerChunk(AsepriteHeader* header,
doc::Sprite* sprite,
doc::Layer** previous_layer,
int* current_level)
{
// Read chunk data
int flags = read16();
int layer_type = read16();
int child_level = read16();
read16(); // default width
read16(); // default height
int blendmode = read16(); // blend mode
int opacity = read8(); // opacity
readPadding(3);
std::string name = readString();
doc::Layer* layer = nullptr;
switch (layer_type) {
case ASE_FILE_LAYER_IMAGE:
layer = new doc::LayerImage(sprite);
break;
case ASE_FILE_LAYER_GROUP:
layer = new doc::LayerGroup(sprite);
break;
case ASE_FILE_LAYER_TILEMAP: {
doc::tileset_index tsi = read32();
if (!sprite->tilesets()->get(tsi)) {
delegate()->error(fmt::format("Error: tileset {0} not found", tsi));
return nullptr;
}
layer = new doc::LayerTilemap(sprite, tsi);
break;
}
default:
delegate()->incompatibilityError(
fmt::format("Unknown layer type found: {0}", layer_type));
break;
}
if (layer) {
if (layer->isImage() &&
// Only transparent layers can have blend mode and opacity
!(flags & int(doc::LayerFlags::Background))) {
static_cast<doc::LayerImage*>(layer)->setBlendMode((doc::BlendMode)blendmode);
if (header->flags & ASE_FILE_FLAG_LAYER_WITH_OPACITY)
static_cast<doc::LayerImage*>(layer)->setOpacity(opacity);
}
// flags
layer->setFlags(static_cast<doc::LayerFlags>(
flags &
static_cast<int>(doc::LayerFlags::PersistentFlagsMask)));
// name
layer->setName(name.c_str());
// Child level
if (child_level == *current_level)
(*previous_layer)->parent()->addLayer(layer);
else if (child_level > *current_level)
static_cast<doc::LayerGroup*>(*previous_layer)->addLayer(layer);
else if (child_level < *current_level) {
doc::LayerGroup* parent = (*previous_layer)->parent();
ASSERT(parent);
if (parent) {
int levels = (*current_level - child_level);
while (levels--) {
ASSERT(parent->parent());
if (!parent->parent())
break;
parent = parent->parent();
}
parent->addLayer(layer);
}
}
*previous_layer = layer;
*current_level = child_level;
}
return layer;
}
//////////////////////////////////////////////////////////////////////
// Raw Image
//////////////////////////////////////////////////////////////////////
namespace {
template<typename ImageTraits>
void read_raw_image_templ(FileInterface* f,
DecodeDelegate* delegate,
doc::Image* image,
const AsepriteHeader* header)
{
PixelIO<ImageTraits> pixel_io;
int x, y;
int w = image->width();
int h = image->height();
for (y=0; y<h; ++y) {
for (x=0; x<w; ++x) {
doc::put_pixel_fast<ImageTraits>(image, x, y, pixel_io.read_pixel(f));
}
delegate->progress((float)f->tell() / (float)header->size);
}
}
void read_raw_image(FileInterface* f,
DecodeDelegate* delegate,
doc::Image* image,
const AsepriteHeader* header)
{
switch (image->pixelFormat()) {
case doc::IMAGE_RGB:
read_raw_image_templ<doc::RgbTraits>(
f, delegate, image, header);
break;
case doc::IMAGE_GRAYSCALE:
read_raw_image_templ<doc::GrayscaleTraits>(
f, delegate, image, header);
break;
case doc::IMAGE_INDEXED:
read_raw_image_templ<doc::IndexedTraits>(
f, delegate, image, header);
break;
case doc::IMAGE_TILEMAP:
read_raw_image_templ<doc::TilemapTraits>(
f, delegate, image, header);
break;
}
}
//////////////////////////////////////////////////////////////////////
// Compressed Image
//////////////////////////////////////////////////////////////////////
template<typename ImageTraits>
void read_compressed_image_templ(FileInterface* f,
DecodeDelegate* delegate,
doc::Image* image,
const AsepriteHeader* header,
const size_t chunk_end)
{
PixelIO<ImageTraits> pixel_io;
z_stream zstream;
zstream.zalloc = (alloc_func)0;
zstream.zfree = (free_func)0;
zstream.opaque = (voidpf)0;
int err = inflateInit(&zstream);
if (err != Z_OK)
throw base::Exception("ZLib error %d in inflateInit().", err);
const int width = image->width();
const int widthBytes = image->widthBytes();
std::vector<uint8_t> scanline(widthBytes);
std::vector<uint8_t> compressed(4096);
std::vector<uint8_t> uncompressed(4096);
int scanline_offset = 0;
int y = 0;
while (true) {
size_t input_bytes;
if (f->tell()+compressed.size() > chunk_end) {
input_bytes = chunk_end - f->tell(); // Remaining bytes
ASSERT(input_bytes < compressed.size());
if (input_bytes == 0)
break; // Done, we consumed all chunk
}
else {
input_bytes = compressed.size();
}
size_t bytes_read = f->readBytes(&compressed[0], input_bytes);
// Error reading "input_bytes" bytes, broken file? chunk without
// enough compressed data?
if (bytes_read == 0) {
delegate->error(
fmt::format("Error reading {} bytes of compressed data",
input_bytes));
break;
}
zstream.next_in = (Bytef*)&compressed[0];
zstream.avail_in = bytes_read;
do {
zstream.next_out = (Bytef*)&uncompressed[0];
zstream.avail_out = uncompressed.size();
err = inflate(&zstream, Z_NO_FLUSH);
if (err != Z_OK && err != Z_STREAM_END && err != Z_BUF_ERROR)
throw base::Exception("ZLib error %d in inflate().", err);
size_t uncompressed_bytes = uncompressed.size() - zstream.avail_out;
if (uncompressed_bytes > 0) {
int i = 0;
while (y < image->height()) {
int n = std::min(uncompressed_bytes, scanline.size() - scanline_offset);
if (n > 0) {
// Fill the scanline buffer until it's completed
std::copy(uncompressed.begin()+i,
uncompressed.begin()+i+n,
scanline.begin()+scanline_offset);
uncompressed_bytes -= n;
scanline_offset += n;
i += n;
}
else if (scanline_offset < widthBytes) {
// The scanline is not filled yet.
break;
}
else {
// Copy the whole scanline to the image
pixel_io.read_scanline(
(typename ImageTraits::address_t)image->getPixelAddress(0, y),
width, &scanline[0]);
++y;
scanline_offset = 0;
if (uncompressed_bytes == 0)
break;
}
}
}
} while (zstream.avail_in != 0 && zstream.avail_out == 0);
delegate->progress((float)f->tell() / (float)header->size);
}
err = inflateEnd(&zstream);
if (err != Z_OK)
throw base::Exception("ZLib error %d in inflateEnd().", err);
}
void read_compressed_image(FileInterface* f,
DecodeDelegate* delegate,
doc::Image* image,
const AsepriteHeader* header,
const size_t chunk_end)
{
// Try to read pixel data
try {
switch (image->pixelFormat()) {
case doc::IMAGE_RGB:
read_compressed_image_templ<doc::RgbTraits>(
f, delegate, image, header, chunk_end);
break;
case doc::IMAGE_GRAYSCALE:
read_compressed_image_templ<doc::GrayscaleTraits>(
f, delegate, image, header, chunk_end);
break;
case doc::IMAGE_INDEXED:
read_compressed_image_templ<doc::IndexedTraits>(
f, delegate, image, header, chunk_end);
break;
case doc::IMAGE_TILEMAP:
read_compressed_image_templ<doc::TilemapTraits>(
f, delegate, image, header, chunk_end);
break;
}
}
// OK, in case of error we can show the problem, but continue
// loading more cels.
catch (const std::exception& e) {
delegate->error(e.what());
}
}
} // anonymous namespace
//////////////////////////////////////////////////////////////////////
// Cel Chunk
//////////////////////////////////////////////////////////////////////
doc::Cel* AsepriteDecoder::readCelChunk(doc::Sprite* sprite,
doc::frame_t frame,
doc::PixelFormat pixelFormat,
const AsepriteHeader* header,
const size_t chunk_end)
{
// Read chunk data
doc::layer_t layer_index = read16();
int x = ((int16_t)read16());
int y = ((int16_t)read16());
int opacity = read8();
int cel_type = read16();
int zIndex = ((int16_t)read16());
readPadding(5);
doc::Layer* layer = nullptr;
if (layer_index >= 0 && layer_index < doc::layer_t(m_allLayers.size()))
layer = m_allLayers[layer_index];
if (!layer) {
delegate()->error(
fmt::format("Frame {0} didn't found layer with index {1}",
(int)frame, (int)layer_index));
return nullptr;
}
if (!layer->isImage()) {
delegate()->error(
fmt::format("Invalid .ase file (frame {0} in layer {1} which does not contain images",
(int)frame, (int)layer_index));
return nullptr;
}
// Create the new frame.
std::unique_ptr<doc::Cel> cel;
switch (cel_type) {
case ASE_FILE_RAW_CEL: {
// Read width and height
int w = read16();
int h = read16();
if (w > 0 && h > 0) {
// Read pixel data
doc::ImageRef image(doc::Image::create(pixelFormat, w, h));
read_raw_image(f(), delegate(), image.get(), header);
cel = std::make_unique<doc::Cel>(frame, image);
cel->setPosition(x, y);
cel->setOpacity(opacity);
cel->setZIndex(zIndex);
}
break;
}
case ASE_FILE_LINK_CEL: {
// Read link position
doc::frame_t link_frame = doc::frame_t(read16());
doc::Cel* link = layer->cel(link_frame);
if (link) {
// There were a beta version that allow to the user specify
// different X, Y, or opacity per link, in that case we must
// create a copy.
if (link->x() == x && link->y() == y && link->opacity() == opacity) {
cel.reset(doc::Cel::MakeLink(frame, link));
}
else {
cel.reset(doc::Cel::MakeCopy(frame, link));
cel->setPosition(x, y);
cel->setOpacity(opacity);
}
cel->setZIndex(zIndex);
}
else {
// Linked cel doesn't found
return nullptr;
}
break;
}
case ASE_FILE_COMPRESSED_CEL: {
// Read width and height
int w = read16();
int h = read16();
if (w > 0 && h > 0) {
doc::ImageRef image(doc::Image::create(pixelFormat, w, h));
read_compressed_image(f(), delegate(), image.get(), header, chunk_end);
cel = std::make_unique<doc::Cel>(frame, image);
cel->setPosition(x, y);
cel->setOpacity(opacity);
cel->setZIndex(zIndex);
}
break;
}
case ASE_FILE_COMPRESSED_TILEMAP: {
// Read width and height
int w = read16();
int h = read16();
int bitsPerTile = read16();
uint32_t tileIDMask = read32();
uint32_t tileIDShift = base::mask_shift(tileIDMask);
uint32_t xflipMask = read32();
uint32_t yflipMask = read32();
uint32_t dflipMask = read32();
uint32_t flagsMask = (xflipMask | yflipMask | dflipMask);
readPadding(10);
// We only support 32bpp at the moment
// TODO add support for other bpp (8-bit, 16-bpp)
if (bitsPerTile != 32) {
delegate()->incompatibilityError(
fmt::format("Unsupported tile format: {0} bits per tile", bitsPerTile));
break;
}
if (w > 0 && h > 0) {
doc::ImageRef image(doc::Image::create(doc::IMAGE_TILEMAP, w, h));
image->setMaskColor(doc::notile);
image->clear(doc::notile);
read_compressed_image(f(), delegate(), image.get(), header, chunk_end);
// Check if the tileset of this tilemap has the
// "ASE_TILESET_FLAG_ZERO_IS_NOTILE" we have to adjust all
// tile references to the new format (where empty tile is
// zero)
doc::Tileset* ts = static_cast<doc::LayerTilemap*>(layer)->tileset();
doc::tileset_index tsi = static_cast<doc::LayerTilemap*>(layer)->tilesetIndex();
ASSERT(tsi >= 0 && tsi < m_tilesetFlags.size());
if (tsi >= 0 && tsi < m_tilesetFlags.size() &&
(m_tilesetFlags[tsi] & ASE_TILESET_FLAG_ZERO_IS_NOTILE) == 0) {
doc::fix_old_tilemap(image.get(), ts, tileIDMask, flagsMask);
}
// Convert the tile index and masks to a proper in-memory
// representation for the doc-lib.
doc::transform_image<doc::TilemapTraits>(
image.get(),
[ts, tileIDMask, tileIDShift,
xflipMask, yflipMask, dflipMask]
(doc::tile_t tile) {
// Get the tile index.
doc::tile_index ti = ((tile & tileIDMask) >> tileIDShift);
// If the index is out of bounds from the tileset, we
// allow to keep some small values in-memory, but if the
// index is too big, we consider it as a broken file and
// remove the tile (as an huge index bring some lag
// problems in the remove_unused_tiles_from_tileset()
// creating a big Remap structure).