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Allow ensureAlpha to set alpha transparency level #2634

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Lovell Fuller
2021-04-01 21:14:06 +01:00
parent fe0767df13
commit 8c33d0aa56
10 changed files with 91 additions and 32 deletions
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4
src/common.cc
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@@ -799,10 +799,10 @@ namespace sharp {
/*
Ensures alpha channel, if missing.
*/
VImage EnsureAlpha(VImage image) {
VImage EnsureAlpha(VImage image, double const value) {
if (!HasAlpha(image)) {
std::vector<double> alpha;
alpha.push_back(sharp::MaximumImageAlpha(image.interpretation()));
alpha.push_back(value * sharp::MaximumImageAlpha(image.interpretation()));
image = image.bandjoin_const(alpha);
}
return image;