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LibGfx/JPEG2000: Add two spec comments

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Nico Weber 2024-04-08 21:17:11 -04:00 committed by Tim Flynn
parent 7b7ef7dcc7
commit 0df01dea4a
1 changed files with 3 additions and 0 deletions
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Userland/Libraries/LibGfx/ImageFormats/JPEG2000Loader.cpp
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@ -555,11 +555,14 @@ static ErrorOr<void> parse_codestream_main_header(JPEG2000LoadingContext& contex
}
case J2K_SOT: {
// SOT terminates the main header.
// A.4.2: "There shall be at least one SOT in a codestream."
if (!saw_COD_marker)
return Error::from_string_literal("JPEG2000ImageDecoderPlugin: Required COD marker not present in main header");
if (!saw_QCD_marker)
return Error::from_string_literal("JPEG2000ImageDecoderPlugin: Required QCD marker not present in main header");
// A.6.4: "there is not necessarily a correspondence with the number of sub-bands present because the sub-bands
// can be truncated with no requirement to correct [the QCD] marker segment."
size_t step_sizes_count = context.qcd.step_sizes.visit(
[](Empty) -> size_t { VERIFY_NOT_REACHED(); },
[](Vector<QuantizationDefault::ReversibleStepSize> const& step_sizes) { return step_sizes.size(); },