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LibGfx/TIFF: Don't use SamplesPerPixel to infer the "type" of image

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The number of samples is not a good measure to deduce the type of image
we are decoding. As per the TIFF spec, the PhotometricInterpretation tag
is required and we should use that instead.
This commit is contained in:
Lucas CHOLLET
2023-12-16 20:13:50 -05:00
committed by Andreas Kling
parent 022fce75a6
commit a443d2955a
1 changed files with 4 additions and 3 deletions
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7
Userland/Libraries/LibGfx/ImageFormats/TIFFLoader.cpp
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@@ -90,14 +90,15 @@ private:
ErrorOr<Color> read_color(BigEndianInputBitStream& stream)
{
auto bits_per_sample = *m_metadata.bits_per_sample();
if (m_metadata.samples_per_pixel().value_or(3) == 3) {
if (m_metadata.photometric_interpretation() == PhotometricInterpretation::RGB) {
auto const first_component = TRY(read_component(stream, bits_per_sample[0]));
auto const second_component = TRY(read_component(stream, bits_per_sample[1]));
auto const third_component = TRY(read_component(stream, bits_per_sample[2]));
return Color(first_component, second_component, third_component);
}
if (*m_metadata.samples_per_pixel() == 1) {
if (*m_metadata.photometric_interpretation() == PhotometricInterpretation::WhiteIsZero
|| *m_metadata.photometric_interpretation() == PhotometricInterpretation::BlackIsZero) {
auto luminosity = TRY(read_component(stream, bits_per_sample[0]));
if (m_metadata.photometric_interpretation() == PhotometricInterpretation::WhiteIsZero)
@@ -106,7 +107,7 @@ private:
return Color(luminosity, luminosity, luminosity);
}
return Error::from_string_literal("Unsupported number of sample per pixel");
return Error::from_string_literal("Unsupported value for PhotometricInterpretation");
}
template<CallableAs<ErrorOr<ReadonlyBytes>, u32> StripDecoder>