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LibGfx/PNG: Read the cICP chunk

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This commit is contained in:
Lucas CHOLLET 2025-02-08 00:13:12 -05:00 • committed by Tim Flynn
commit a144481e6c
Notes: github-actions[bot] 2025-02-12 17:26:09 +00:00
10 changed files with 94 additions and 6 deletions
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30
Libraries/LibGfx/ImageFormats/PNGLoader.cpp
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@ -30,6 +30,7 @@ struct PNGLoadingContext {
u32 frame_count { 0 };
u32 loop_count { 0 };
Vector<ImageFrameDescriptor> frame_descriptors;
Optional<Media::CodingIndependentCodePoints> cicp;
Optional<ByteBuffer> icc_profile;
OwnPtr<ExifMetadata> exif_metadata;
@ -111,6 +112,11 @@ ErrorOr<ImageFrameDescriptor> PNGImageDecoderPlugin::frame(size_t index, Optiona
return m_context->frame_descriptors[index];
}
ErrorOr<Optional<Media::CodingIndependentCodePoints>> PNGImageDecoderPlugin::cicp()
{
return m_context->cicp;
}
ErrorOr<Optional<ReadonlyBytes>> PNGImageDecoderPlugin::icc_data()
{
if (m_context->icc_profile.has_value())
@ -187,12 +193,24 @@ ErrorOr<void> PNGImageDecoderPlugin::initialize()
png_set_filler(m_context->png_ptr, 0xFF, PNG_FILLER_AFTER);
png_set_bgr(m_context->png_ptr);
char* profile_name = nullptr;
int compression_type = 0;
u8* profile_data = nullptr;
u32 profile_len = 0;
if (png_get_iCCP(m_context->png_ptr, m_context->info_ptr, &profile_name, &compression_type, &profile_data, &profile_len))
m_context->icc_profile = TRY(ByteBuffer::copy(profile_data, profile_len));
png_byte color_primaries { 0 };
png_byte transfer_function { 0 };
png_byte matrix_coefficients { 0 };
png_byte video_full_range_flag { 0 };
if (png_get_cICP(m_context->png_ptr, m_context->info_ptr, &color_primaries, &transfer_function, &matrix_coefficients, &video_full_range_flag)) {
Media::ColorPrimaries cp { color_primaries };
Media::TransferCharacteristics tc { transfer_function };
Media::MatrixCoefficients mc { matrix_coefficients };
Media::VideoFullRangeFlag rf { video_full_range_flag };
m_context->cicp = Media::CodingIndependentCodePoints { cp, tc, mc, rf };
} else {
char* profile_name = nullptr;
int compression_type = 0;
u8* profile_data = nullptr;
u32 profile_len = 0;
if (png_get_iCCP(m_context->png_ptr, m_context->info_ptr, &profile_name, &compression_type, &profile_data, &profile_len))
m_context->icc_profile = TRY(ByteBuffer::copy(profile_data, profile_len));
}
u8* exif_data = nullptr;
u32 exif_length = 0;