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gecko-dev/third_party/jpeg-xl/lib/extras/codec_gif.cc

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// Copyright (c) the JPEG XL Project Authors. All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "lib/extras/codec_gif.h"
#include <gif_lib.h>
#include <string.h>
#include <algorithm>
#include <string>
#include <utility>
#include <vector>
#include "lib/jxl/base/compiler_specific.h"
#include "lib/jxl/color_encoding_internal.h"
#include "lib/jxl/frame_header.h"
#include "lib/jxl/headers.h"
#include "lib/jxl/image.h"
#include "lib/jxl/image_bundle.h"
#include "lib/jxl/image_ops.h"
#include "lib/jxl/luminance.h"
#ifdef MEMORY_SANITIZER
#include "sanitizer/msan_interface.h"
#endif
namespace jxl {
namespace {
struct ReadState {
Span<const uint8_t> bytes;
};
struct DGifCloser {
void operator()(GifFileType* const ptr) const { DGifCloseFile(ptr, nullptr); }
};
using GifUniquePtr = std::unique_ptr<GifFileType, DGifCloser>;
// Gif does not support partial transparency, so this considers anything non-0
// as opaque.
bool AllOpaque(const ImageF& alpha) {
for (size_t y = 0; y < alpha.ysize(); ++y) {
const float* const JXL_RESTRICT row = alpha.ConstRow(y);
for (size_t x = 0; x < alpha.xsize(); ++x) {
if (row[x] == 0.f) {
return false;
}
}
}
return true;
}
} // namespace
Status DecodeImageGIF(Span<const uint8_t> bytes, ThreadPool* pool,
CodecInOut* io) {
int error = GIF_OK;
ReadState state = {bytes};
const auto ReadFromSpan = [](GifFileType* const gif, GifByteType* const bytes,
int n) {
ReadState* const state = reinterpret_cast<ReadState*>(gif->UserData);
// giflib API requires the input size `n` to be signed int.
if (static_cast<size_t>(n) > state->bytes.size()) {
n = state->bytes.size();
}
memcpy(bytes, state->bytes.data(), n);
state->bytes.remove_prefix(n);
return n;
};
GifUniquePtr gif(DGifOpen(&state, ReadFromSpan, &error));
if (gif == nullptr) {
if (error == D_GIF_ERR_NOT_GIF_FILE) {
// Not an error.
return false;
} else {
return JXL_FAILURE("Failed to read GIF: %s", GifErrorString(error));
}
}
error = DGifSlurp(gif.get());
if (error != GIF_OK) {
return JXL_FAILURE("Failed to read GIF: %s", GifErrorString(gif->Error));
}
#ifdef MEMORY_SANITIZER
__msan_unpoison(gif.get(), sizeof(*gif));
if (gif->SColorMap) {
__msan_unpoison(gif->SColorMap, sizeof(*gif->SColorMap));
__msan_unpoison(gif->SColorMap->Colors, sizeof(*gif->SColorMap->Colors) *
gif->SColorMap->ColorCount);
}
__msan_unpoison(gif->SavedImages,
sizeof(*gif->SavedImages) * gif->ImageCount);
#endif
const SizeConstraints* constraints = &io->constraints;
JXL_RETURN_IF_ERROR(
VerifyDimensions<uint32_t>(constraints, gif->SWidth, gif->SHeight));
uint64_t total_pixel_count =
static_cast<uint64_t>(gif->SWidth) * gif->SHeight;
for (int i = 0; i < gif->ImageCount; ++i) {
const SavedImage& image = gif->SavedImages[i];
uint32_t w = image.ImageDesc.Width;
uint32_t h = image.ImageDesc.Height;
JXL_RETURN_IF_ERROR(VerifyDimensions<uint32_t>(constraints, w, h));
uint64_t pixel_count = static_cast<uint64_t>(w) * h;
if (total_pixel_count + pixel_count < total_pixel_count) {
return JXL_FAILURE("Image too big");
}
total_pixel_count += pixel_count;
if (total_pixel_count > constraints->dec_max_pixels) {
return JXL_FAILURE("Image too big");
}
}
if (!gif->SColorMap) {
for (int i = 0; i < gif->ImageCount; ++i) {
if (!gif->SavedImages[i].ImageDesc.ColorMap) {
return JXL_FAILURE("Missing GIF color map");
}
}
}
if (gif->ImageCount > 1) {
io->metadata.m.have_animation = true;
// Delays in GIF are specified in 100ths of a second.
io->metadata.m.animation.tps_numerator = 100;
}
io->frames.clear();
io->frames.reserve(gif->ImageCount);
io->dec_pixels = 0;
io->metadata.m.SetUintSamples(8);
io->metadata.m.color_encoding = ColorEncoding::SRGB();
io->metadata.m.SetAlphaBits(0);
(void)io->dec_hints.Foreach(
[](const std::string& key, const std::string& /*value*/) {
JXL_WARNING("GIF decoder ignoring %s hint", key.c_str());
return true;
});
Image3F canvas(gif->SWidth, gif->SHeight);
io->SetSize(gif->SWidth, gif->SHeight);
ImageF alpha(gif->SWidth, gif->SHeight);
GifColorType background_color;
if (gif->SColorMap == nullptr) {
background_color = {0, 0, 0};
} else {
if (gif->SBackGroundColor >= gif->SColorMap->ColorCount) {
return JXL_FAILURE("GIF specifies out-of-bounds background color");
}
background_color = gif->SColorMap->Colors[gif->SBackGroundColor];
}
FillPlane<float>(background_color.Red, &canvas.Plane(0));
FillPlane<float>(background_color.Green, &canvas.Plane(1));
FillPlane<float>(background_color.Blue, &canvas.Plane(2));
ZeroFillImage(&alpha);
Rect previous_rect_if_restore_to_background;
bool has_alpha = false;
bool replace = true;
bool last_base_was_none = true;
for (int i = 0; i < gif->ImageCount; ++i) {
const SavedImage& image = gif->SavedImages[i];
#ifdef MEMORY_SANITIZER
__msan_unpoison(image.RasterBits, sizeof(*image.RasterBits) *
image.ImageDesc.Width *
image.ImageDesc.Height);
#endif
const Rect image_rect(image.ImageDesc.Left, image.ImageDesc.Top,
image.ImageDesc.Width, image.ImageDesc.Height);
io->dec_pixels += image_rect.xsize() * image_rect.ysize();
Rect total_rect;
if (previous_rect_if_restore_to_background.xsize() != 0 ||
previous_rect_if_restore_to_background.ysize() != 0) {
const size_t xbegin = std::min(
image_rect.x0(), previous_rect_if_restore_to_background.x0());
const size_t ybegin = std::min(
image_rect.y0(), previous_rect_if_restore_to_background.y0());
const size_t xend =
std::max(image_rect.x0() + image_rect.xsize(),
previous_rect_if_restore_to_background.x0() +
previous_rect_if_restore_to_background.xsize());
const size_t yend =
std::max(image_rect.y0() + image_rect.ysize(),
previous_rect_if_restore_to_background.y0() +
previous_rect_if_restore_to_background.ysize());
total_rect = Rect(xbegin, ybegin, xend - xbegin, yend - ybegin);
previous_rect_if_restore_to_background = Rect();
replace = true;
} else {
total_rect = image_rect;
replace = false;
}
if (!image_rect.IsInside(canvas)) {
return JXL_FAILURE("GIF frame extends outside of the canvas");
}
const ColorMapObject* const color_map =
image.ImageDesc.ColorMap ? image.ImageDesc.ColorMap : gif->SColorMap;
JXL_CHECK(color_map);
#ifdef MEMORY_SANITIZER
__msan_unpoison(color_map, sizeof(*color_map));
__msan_unpoison(color_map->Colors,
sizeof(*color_map->Colors) * color_map->ColorCount);
#endif
GraphicsControlBlock gcb;
DGifSavedExtensionToGCB(gif.get(), i, &gcb);
#ifdef MEMORY_SANITIZER
__msan_unpoison(&gcb, sizeof(gcb));
#endif
ImageBundle bundle(&io->metadata.m);
if (io->metadata.m.have_animation) {
bundle.duration = gcb.DelayTime;
bundle.origin.x0 = total_rect.x0();
bundle.origin.y0 = total_rect.y0();
if (last_base_was_none) {
replace = true;
}
bundle.blend = !replace;
// TODO(veluca): this could in principle be implemented.
if (last_base_was_none &&
(total_rect.x0() != 0 || total_rect.y0() != 0 ||
total_rect.xsize() != canvas.xsize() ||
total_rect.ysize() != canvas.ysize() || !replace)) {
return JXL_FAILURE(
"GIF with dispose-to-0 is not supported for non-full or "
"blended frames");
}
switch (gcb.DisposalMode) {
case DISPOSE_DO_NOT:
case DISPOSE_BACKGROUND:
bundle.use_for_next_frame = true;
last_base_was_none = false;
break;
case DISPOSE_PREVIOUS:
bundle.use_for_next_frame = false;
break;
default:
bundle.use_for_next_frame = false;
last_base_was_none = true;
}
}
Image3F frame = CopyImage(canvas);
ImageF frame_alpha = CopyImage(alpha);
for (size_t y = 0, byte_index = 0; y < image_rect.ysize(); ++y) {
float* const JXL_RESTRICT row_r = image_rect.Row(&frame.Plane(0), y);
float* const JXL_RESTRICT row_g = image_rect.Row(&frame.Plane(1), y);
float* const JXL_RESTRICT row_b = image_rect.Row(&frame.Plane(2), y);
float* const JXL_RESTRICT row_alpha = image_rect.Row(&frame_alpha, y);
for (size_t x = 0; x < image_rect.xsize(); ++x, ++byte_index) {
const GifByteType byte = image.RasterBits[byte_index];
if (byte >= color_map->ColorCount) {
return JXL_FAILURE("GIF color is out of bounds");
}
if (byte == gcb.TransparentColor) continue;
GifColorType color = color_map->Colors[byte];
row_alpha[x] = 1.f;
row_r[x] = (1.f / 255) * color.Red;
row_g[x] = (1.f / 255) * color.Green;
row_b[x] = (1.f / 255) * color.Blue;
}
}
Image3F sub_frame(total_rect.xsize(), total_rect.ysize());
ImageF sub_frame_alpha(total_rect.xsize(), total_rect.ysize());
bool blend_alpha = false;
if (replace) {
CopyImageTo(total_rect, frame, &sub_frame);
CopyImageTo(total_rect, frame_alpha, &sub_frame_alpha);
} else {
for (size_t y = 0, byte_index = 0; y < image_rect.ysize(); ++y) {
float* const JXL_RESTRICT row_r = sub_frame.PlaneRow(0, y);
float* const JXL_RESTRICT row_g = sub_frame.PlaneRow(1, y);
float* const JXL_RESTRICT row_b = sub_frame.PlaneRow(2, y);
float* const JXL_RESTRICT row_alpha = sub_frame_alpha.Row(y);
for (size_t x = 0; x < image_rect.xsize(); ++x, ++byte_index) {
const GifByteType byte = image.RasterBits[byte_index];
if (byte > color_map->ColorCount) {
return JXL_FAILURE("GIF color is out of bounds");
}
if (byte == gcb.TransparentColor) {
row_alpha[x] = 0;
row_r[x] = 0;
row_g[x] = 0;
row_b[x] = 0;
blend_alpha =
true; // need to use alpha channel if BlendMode blend is used
continue;
}
GifColorType color = color_map->Colors[byte];
row_alpha[x] = 1.f;
row_r[x] = (1.f / 255) * color.Red;
row_g[x] = (1.f / 255) * color.Green;
row_b[x] = (1.f / 255) * color.Blue;
}
}
}
bundle.SetFromImage(std::move(sub_frame), ColorEncoding::SRGB());
if (has_alpha || !AllOpaque(frame_alpha) || blend_alpha) {
if (!has_alpha) {
has_alpha = true;
io->metadata.m.SetAlphaBits(8);
for (ImageBundle& previous_frame : io->frames) {
ImageF previous_alpha(previous_frame.xsize(), previous_frame.ysize());
FillImage(1.f, &previous_alpha);
previous_frame.SetAlpha(std::move(previous_alpha),
/*alpha_is_premultiplied=*/false);
}
}
bundle.SetAlpha(std::move(sub_frame_alpha),
/*alpha_is_premultiplied=*/false);
}
io->frames.push_back(std::move(bundle));
switch (gcb.DisposalMode) {
case DISPOSE_DO_NOT:
canvas = std::move(frame);
alpha = std::move(frame_alpha);
break;
case DISPOSE_BACKGROUND:
FillPlane<float>((1.f / 255) * background_color.Red, &canvas.Plane(0),
image_rect);
FillPlane<float>((1.f / 255) * background_color.Green, &canvas.Plane(1),
image_rect);
FillPlane<float>((1.f / 255) * background_color.Blue, &canvas.Plane(2),
image_rect);
FillPlane(0.f, &alpha, image_rect);
previous_rect_if_restore_to_background = image_rect;
break;
case DISPOSE_PREVIOUS:
break;
case DISPOSAL_UNSPECIFIED:
default:
FillPlane<float>((1.f / 255) * background_color.Red, &canvas.Plane(0));
FillPlane<float>((1.f / 255) * background_color.Green,
&canvas.Plane(1));
FillPlane<float>((1.f / 255) * background_color.Blue, &canvas.Plane(2));
ZeroFillImage(&alpha);
}
}
SetIntensityTarget(io);
return true;
}
} // namespace jxl
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