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Implement "lighten" + "darken" blend-modes

This commit is contained in:
Elias Batek 2024-05-25 00:58:05 +02:00
parent 6e469c27bd
commit 9a4f8467f8
1 changed files with 12 additions and 2 deletions
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14
pixmappaint.d
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@ -272,6 +272,9 @@ private struct OriginRectangle {
// misc
private {
Point pos(Rectangle r) => r.upperLeft;
T max(T)(T a, T b) => (a >= b) ? a : b;
T min(T)(T a, T b) => (a <= b) ? a : b;
}
/++
@ -491,6 +494,7 @@ void blendPixel(BlendMode mode, BlendAccuracy accuracy = BlendAccuracy.rgba)(
ref Pixel target,
const Pixel source,
) if (mode == Blend.multiply) {
return alphaBlend!(accuracy,
(a, b) => n255thsOf(a, b)
)(target, source);
@ -512,7 +516,10 @@ void blendPixel(BlendMode mode, BlendAccuracy accuracy = BlendAccuracy.rgba)(
ref Pixel target,
const Pixel source,
) if (mode == Blend.darken) {
assert(false, "TODO");
return alphaBlend!(accuracy,
(a, b) => min(a, b)
)(target, source);
}
/// ditto
@ -520,7 +527,10 @@ void blendPixel(BlendMode mode, BlendAccuracy accuracy = BlendAccuracy.rgba)(
ref Pixel target,
const Pixel source,
) if (mode == Blend.lighten) {
assert(false, "TODO");
return alphaBlend!(accuracy,
(a, b) => max(a, b)
)(target, source);
}
/++