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Add alpha channel, if required, before extend operation (#439)

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frulo
2016-05-26 10:46:14 +02:00
committed by Lovell Fuller
parent 331926dc3c
commit e699e36270
3 changed files with 20 additions and 1 deletions
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9
src/pipeline.cc
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@@ -598,12 +598,19 @@ class PipelineWorker : public AsyncWorker {
baton->background[2] * multiplier
};
// Add alpha channel to background colour
if (HasAlpha(image)) {
if (baton->background[3] < 255.0 || HasAlpha(image)) {
background.push_back(baton->background[3] * multiplier);
}
// Add non-transparent alpha channel, if required
if (baton->background[3] < 255.0 && !HasAlpha(image)) {
image = image.bandjoin(
VImage::new_matrix(image.width(), image.height()).new_from_image(255 * multiplier)
);
}
// Embed
baton->width = image.width() + baton->extendLeft + baton->extendRight;
baton->height = image.height() + baton->extendTop + baton->extendBottom;
image = image.embed(baton->extendLeft, baton->extendTop, baton->width, baton->height,
VImage::option()->set("extend", VIPS_EXTEND_BACKGROUND)->set("background", background));
}