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LibGfx/JBIG2: Implement decode_end_of_stripe() a bit

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This is enough to be able to decode 0000857.pdf p1-4 and
0000372.pdf p11.
This commit is contained in:
Nico Weber 2024-03-21 09:08:28 -04:00 committed by Andreas Kling
parent c4a45bb521
commit 8e9157d6ce
Notes: sideshowbarker 2024-07-18 00:54:03 +09:00 
Author: https://github.com/nico
Commit: https://github.com/SerenityOS/serenity/commit/8e9157d6ce
Pull-request: https://github.com/SerenityOS/serenity/pull/23695
1 changed files with 11 additions and 2 deletions
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13
Userland/Libraries/LibGfx/ImageFormats/JBIG2Loader.cpp
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@ -2049,9 +2049,18 @@ static ErrorOr<void> decode_end_of_page(JBIG2LoadingContext&, SegmentData const&
return {};
}
static ErrorOr<void> decode_end_of_stripe(JBIG2LoadingContext&, SegmentData const&)
static ErrorOr<void> decode_end_of_stripe(JBIG2LoadingContext&, SegmentData const& segment)
{
return Error::from_string_literal("JBIG2ImageDecoderPlugin: Cannot decode end of stripe yet");
// 7.4.10 End of stripe segment syntax
// "The segment data of an end of stripe segment consists of one four-byte value, specifying the Y coordinate of the end row."
if (segment.data.size() != 4)
return Error::from_string_literal("JBIG2ImageDecoderPlugin: End of strip segment has wrong size");
// FIXME: Once we implement support for images with initially indeterminate height, we need these values to determine the height at the end.
u32 y_coordinate = *reinterpret_cast<BigEndian<u32> const*>(segment.data.data());
dbgln_if(JBIG2_DEBUG, "End of stripe: y={}", y_coordinate);
return {};
}
static ErrorOr<void> decode_end_of_file(JBIG2LoadingContext&, SegmentData const& segment)