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Add unflatten operation to create an alpha channel (#3461)

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Anton Marsden
2023-04-07 22:01:29 +12:00
committed by GitHub
parent b9c3851515
commit a4c6eba7d4
11 changed files with 93 additions and 0 deletions
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8
src/pipeline.cc
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@@ -550,7 +550,9 @@ class PipelineWorker : public Napi::AsyncWorker {
if (baton->medianSize > 0) {
image = image.median(baton->medianSize);
}
// Threshold - must happen before blurring, due to the utility of blurring after thresholding
// Threshold - must happen before unflatten to enable non-white unflattening
if (baton->threshold != 0) {
image = sharp::Threshold(image, baton->threshold, baton->thresholdGrayscale);
}
@@ -560,6 +562,11 @@ class PipelineWorker : public Napi::AsyncWorker {
image = sharp::Blur(image, baton->blurSigma);
}
// Unflatten the image
if (baton->unflatten) {
image = sharp::Unflatten(image);
}
// Convolve
if (shouldConv) {
image = sharp::Convolve(image,
@@ -1460,6 +1467,7 @@ Napi::Value pipeline(const Napi::CallbackInfo& info) {
// Operators
baton->flatten = sharp::AttrAsBool(options, "flatten");
baton->flattenBackground = sharp::AttrAsVectorOfDouble(options, "flattenBackground");
baton->unflatten = sharp::AttrAsBool(options, "unflatten");
baton->negate = sharp::AttrAsBool(options, "negate");
baton->negateAlpha = sharp::AttrAsBool(options, "negateAlpha");
baton->blurSigma = sharp::AttrAsDouble(options, "blurSigma");