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Ensure fit=contain resizing supports multiple alpha channels #4382

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Lovell Fuller
2025-05-13 14:30:34 +01:00
parent 32872ef840
commit 94481a967e
3 changed files with 36 additions and 2 deletions
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6
src/common.cc
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@@ -1001,9 +1001,11 @@ namespace sharp {
0.0722 * colour[2])
};
}
// Add alpha channel to alphaColour colour
// Add alpha channel(s) to alphaColour colour
if (colour[3] < 255.0 || image.has_alpha()) {
alphaColour.push_back(colour[3] * multiplier);
do {
alphaColour.push_back(colour[3] * multiplier);
} while (alphaColour.size() < static_cast<size_t>(image.bands()));
}
// Ensure alphaColour colour uses correct colourspace
alphaColour = sharp::GetRgbaAsColourspace(alphaColour, image.interpretation(), premultiply);