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Ensure background is premultiplied when compositing #2858

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Lovell Fuller
2021-08-29 16:40:40 +01:00
parent 2031d7d112
commit 60adc110f5
5 changed files with 51 additions and 17 deletions
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5
src/common.h
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@@ -288,12 +288,13 @@ namespace sharp {
/*
Convert RGBA value to another colourspace
*/
std::vector<double> GetRgbaAsColourspace(std::vector<double> const rgba, VipsInterpretation const interpretation);
std::vector<double> GetRgbaAsColourspace(std::vector<double> const rgba,
VipsInterpretation const interpretation, bool premultiply);
/*
Apply the alpha channel to a given colour
*/
std::tuple<VImage, std::vector<double>> ApplyAlpha(VImage image, std::vector<double> colour);
std::tuple<VImage, std::vector<double>> ApplyAlpha(VImage image, std::vector<double> colour, bool premultiply);
/*
Removes alpha channel, if any.