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LibGfx/JPEGXL: Support images with the have_crop option in FrameHeader

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This commit only allows us to read these values. The decoder will still
output the image as if no cropping was requested.
This commit is contained in:
Lucas CHOLLET 2023-08-10 15:48:49 -04:00 committed by Andreas Kling
parent a9620d8784
commit 70e4d3a9b6
Notes: sideshowbarker 2024-07-17 16:23:55 +09:00 
Author: https://github.com/LucasChollet
Commit: https://github.com/SerenityOS/serenity/commit/70e4d3a9b6
Pull-request: https://github.com/SerenityOS/serenity/pull/20505
1 changed files with 29 additions and 8 deletions
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37
Userland/Libraries/LibGfx/ImageFormats/JPEGXLLoader.cpp
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@ -681,6 +681,10 @@ struct FrameHeader {
u8 lf_level {};
bool have_crop { false };
i32 x0 {};
i32 y0 {};
u32 width {};
u32 height {};
BlendingInfo blending_info {};
FixedArray<BlendingInfo> ec_blending_info {};
@ -701,7 +705,9 @@ static int operator&(FrameHeader::Flags first, FrameHeader::Flags second)
return static_cast<int>(first) & static_cast<int>(second);
}
static ErrorOr<FrameHeader> read_frame_header(LittleEndianInputBitStream& stream, ImageMetadata const& metadata)
static ErrorOr<FrameHeader> read_frame_header(LittleEndianInputBitStream& stream,
SizeHeader size_header,
ImageMetadata const& metadata)
{
FrameHeader frame_header;
bool const all_default = TRY(stream.read_bit());
@ -744,15 +750,29 @@ static ErrorOr<FrameHeader> read_frame_header(LittleEndianInputBitStream& stream
if (frame_header.frame_type != FrameHeader::FrameType::kLFFrame)
frame_header.have_crop = TRY(stream.read_bit());
if (frame_header.have_crop)
TODO();
if (frame_header.have_crop) {
auto const read_crop_dimension = [&]() -> ErrorOr<u32> {
return U32(TRY(stream.read_bits(8)), 256 + TRY(stream.read_bits(11)), 2304 + TRY(stream.read_bits(14)), 18688 + TRY(stream.read_bits(30)));
};
if (frame_header.frame_type != FrameHeader::FrameType::kReferenceOnly) {
frame_header.x0 = unpack_signed(TRY(read_crop_dimension()));
frame_header.y0 = unpack_signed(TRY(read_crop_dimension()));
}
frame_header.width = TRY(read_crop_dimension());
frame_header.height = TRY(read_crop_dimension());
}
bool const normal_frame = frame_header.frame_type == FrameHeader::FrameType::kRegularFrame
|| frame_header.frame_type == FrameHeader::FrameType::kSkipProgressive;
// FIXME: also consider "cropped" image of the dimension of the frame
VERIFY(!frame_header.have_crop);
bool const full_frame = !frame_header.have_crop;
// Let full_frame be true if and only if have_crop is false or if the frame area given
// by width and height and offsets x0 and y0 completely covers the image area.
bool const cover_image_area = frame_header.x0 <= 0 && frame_header.y0 <= 0
&& (frame_header.width + frame_header.x0 >= size_header.width)
&& (frame_header.height + frame_header.y0 == size_header.height);
bool const full_frame = !frame_header.have_crop || cover_image_area;
if (normal_frame) {
frame_header.blending_info = TRY(read_blending_info(stream, metadata, full_frame));
@ -2304,13 +2324,14 @@ static ErrorOr<Frame> read_frame(LittleEndianInputBitStream& stream,
Frame frame;
frame.frame_header = TRY(read_frame_header(stream, metadata));
frame.frame_header = TRY(read_frame_header(stream, size_header, metadata));
if (!frame.frame_header.have_crop) {
frame.width = size_header.width;
frame.height = size_header.height;
} else {
TODO();
frame.width = frame.frame_header.width;
frame.height = frame.frame_header.height;
}
if (frame.frame_header.upsampling > 1) {