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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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10
src/pipeline.cc
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@@ -346,7 +346,7 @@ class PipelineWorker : public Napi::AsyncWorker {
bool const shouldModulate = baton->brightness != 1.0 || baton->saturation != 1.0 || baton->hue != 0.0;
if (shouldComposite && !sharp::HasAlpha(image)) {
image = sharp::EnsureAlpha(image);
image = sharp::EnsureAlpha(image, 1);
}
bool const shouldPremultiplyAlpha = sharp::HasAlpha(image) &&
@@ -594,7 +594,7 @@ class PipelineWorker : public Napi::AsyncWorker {
// Ensure image to composite is sRGB with premultiplied alpha
compositeImage = compositeImage.colourspace(VIPS_INTERPRETATION_sRGB);
if (!sharp::HasAlpha(compositeImage)) {
compositeImage = sharp::EnsureAlpha(compositeImage);
compositeImage = sharp::EnsureAlpha(compositeImage, 1);
}
if (!composite->premultiplied) compositeImage = compositeImage.premultiply();
// Calculate position
@@ -691,8 +691,8 @@ class PipelineWorker : public Napi::AsyncWorker {
}
// Ensure alpha channel, if missing
if (baton->ensureAlpha) {
image = sharp::EnsureAlpha(image);
if (baton->ensureAlpha != -1) {
image = sharp::EnsureAlpha(image, baton->ensureAlpha);
}
// Convert image to sRGB, if not already
@@ -1341,7 +1341,7 @@ Napi::Value pipeline(const Napi::CallbackInfo& info) {
baton->affineInterpolator = vips::VInterpolate::new_from_name(sharp::AttrAsStr(options, "affineInterpolator").data());
baton->removeAlpha = sharp::AttrAsBool(options, "removeAlpha");
baton->ensureAlpha = sharp::AttrAsBool(options, "ensureAlpha");
baton->ensureAlpha = sharp::AttrAsDouble(options, "ensureAlpha");
if (options.Has("boolean")) {
baton->boolean = sharp::CreateInputDescriptor(options.Get("boolean").As<Napi::Object>());
baton->booleanOp = sharp::GetBooleanOperation(sharp::AttrAsStr(options, "booleanOp"));