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LibGfx: Don't reject SOF2 JPEGs that don't use spectral approximation

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Precisely, we now accept every SOF2 image but error on scans that has a
spectral approximation parameter different of 0.
This commit is contained in:
Lucas CHOLLET 2023-02-26 00:16:08 -05:00 • committed by Linus Groh
parent 342c94c4d7
commit 89e8f4692d
1 changed files with 4 additions and 2 deletions
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6
Userland/Libraries/LibGfx/JPEGLoader.cpp
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@ -574,6 +574,7 @@ static inline bool is_supported_marker(Marker const marker)
case JPEG_DRI:
case JPEG_EOI:
case JPEG_SOF0:
case JPEG_SOF2:
case JPEG_SOI:
case JPEG_SOS:
return true;
@ -649,8 +650,8 @@ static ErrorOr<void> read_start_of_scan(AK::SeekableStream& stream, JPEGLoadingC
current_scan.spectral_selection_end,
current_scan.successive_approximation);
// The three values should be fixed for baseline JPEGs utilizing sequential DCT.
if (current_scan.spectral_selection_start != 0 || current_scan.spectral_selection_end != 63 || current_scan.successive_approximation != 0) {
// FIXME: Support SOF2 jpegs with current_scan.successive_approximation != 0
if (current_scan.spectral_selection_start > 63 || current_scan.spectral_selection_end > 63 || current_scan.successive_approximation != 0) {
dbgln_if(JPEG_DEBUG, "{}: ERROR! Start of Selection: {}, End of Selection: {}, Successive Approximation: {}!",
TRY(stream.tell()),
current_scan.spectral_selection_start,
@ -1292,6 +1293,7 @@ static ErrorOr<void> parse_header(AK::SeekableStream& stream, JPEGLoadingContext
dbgln_if(JPEG_DEBUG, "{}: Unexpected marker {:x}!", TRY(stream.tell()), marker);
return Error::from_string_literal("Unexpected marker");
case JPEG_SOF0:
case JPEG_SOF2:
TRY(read_start_of_frame(stream, context));
context.state = JPEGLoadingContext::FrameDecoded;
return {};