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Fix embedding onto transparent backgrounds #366

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Fully automate embed tests to prevent regression
This commit is contained in:
Lovell Fuller
2016-02-25 18:35:56 +00:00
parent 62e04f7784
commit df33c3024a
7 changed files with 26 additions and 32 deletions
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6
src/pipeline.cc
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@@ -585,9 +585,9 @@ class PipelineWorker : public AsyncWorker {
}
// Add non-transparent alpha channel, if required
if (baton->background[3] < 255.0 && !HasAlpha(image)) {
VImage alpha = VImage::new_matrix(image.width(), image.height())
.new_from_image(baton->background[3] * multiplier);
image = image.bandjoin(alpha);
image = image.bandjoin(
VImage::new_matrix(image.width(), image.height()).new_from_image(255 * multiplier)
);
}
// Embed
int left = static_cast<int>(round((baton->width - image.width()) / 2));