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Implement color-burn, color-dodge, difference, exclusion and subtract blend modes

This commit is contained in:
Elias Batek 2024-05-26 14:58:41 +02:00
parent bd4ec9b45a
commit 5d839f34c2
1 changed files with 88 additions and 0 deletions
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88
pixmappaint.d
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@ -24,8 +24,10 @@ import std.math : round;
- Refactoring the template-mess of blendPixel() & co.
- A bunch more blend modes
- Scaling
- Cropping
- Rotating
- Skewing
- HSL
*/
///
@ -975,6 +977,17 @@ enum BlendMode {
///
lighten,
///
colorDodge,
///
colorBurn,
///
difference,
///
exclusion,
///
subtract,
///
divide,
}
@ -1109,6 +1122,81 @@ void blendPixel(BlendMode mode, BlendAccuracy accuracy = BlendAccuracy.rgba)(
})(target, source);
}
/// ditto
void blendPixel(BlendMode mode, BlendAccuracy accuracy = BlendAccuracy.rgba)(
ref Pixel target,
const Pixel source,
) if (mode == Blend.colorDodge) {
return alphaBlend!(accuracy, function(const ubyte b, const ubyte f) {
if (b == 0x00) {
return ubyte(0x00);
}
if (f == 0xFF) {
return ubyte(0xFF);
}
return min(
ubyte(0xFF),
clamp255((255 * b) / (0xFF - f))
);
})(target, source);
}
/// ditto
void blendPixel(BlendMode mode, BlendAccuracy accuracy = BlendAccuracy.rgba)(
ref Pixel target,
const Pixel source,
) if (mode == Blend.colorBurn) {
return alphaBlend!(accuracy, function(const ubyte b, const ubyte f) {
if (b == 0xFF) {
return ubyte(0xFF);
}
if (f == 0x00) {
return ubyte(0x00);
}
immutable m = min(
ubyte(0xFF),
clamp255(((0xFF - b) * 255) / f)
);
return castTo!ubyte(0xFF - m);
})(target, source);
}
/// ditto
void blendPixel(BlendMode mode, BlendAccuracy accuracy = BlendAccuracy.rgba)(
ref Pixel target,
const Pixel source,
) if (mode == Blend.difference) {
return alphaBlend!(accuracy,
(b, f) => (b > f) ? castTo!ubyte(b - f) : castTo!ubyte(f - b)
)(target, source);
}
/// ditto
void blendPixel(BlendMode mode, BlendAccuracy accuracy = BlendAccuracy.rgba)(
ref Pixel target,
const Pixel source,
) if (mode == Blend.exclusion) {
return alphaBlend!(accuracy,
(b, f) => castTo!ubyte(b + f - (2 * n255thsOf(f, b)))
)(target, source);
}
/// ditto
void blendPixel(BlendMode mode, BlendAccuracy accuracy = BlendAccuracy.rgba)(
ref Pixel target,
const Pixel source,
) if (mode == Blend.subtract) {
return alphaBlend!(accuracy,
(b, f) => (b > f) ? castTo!ubyte(b - f) : ubyte(0)
)(target, source);
}
/// ditto
void blendPixel(BlendMode mode, BlendAccuracy accuracy = BlendAccuracy.rgba)(
ref Pixel target,