mirror of https://github.com/adamdruppe/arsd.git
Refactor blending functions
This commit is contained in:
Elias Batek
parent
1aae3674dc
commit
0b2481bab6
296
pixmappaint.d
296
pixmappaint.d
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@ -846,7 +846,7 @@ in (opacity <= 1.0) {
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pixmap.opacity = opacity255;
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}
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// ==== Alpha-blending functions ====
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// ==== Blending functions ====
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/++
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Alpha-blending accuracy level
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@ -882,66 +882,6 @@ enum BlendAccuracy {
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rgba = true,
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}
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///
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public void alphaBlend(
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BlendAccuracy accuracy,
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ubyte function(const ubyte, const ubyte) blend = null,
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)(
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scope Pixel[] target,
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scope const Pixel[] source,
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) @trusted
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in (source.length == target.length) {
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foreach (immutable idx, ref pxTarget; target) {
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alphaBlend(pxTarget, source.ptr[idx]);
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}
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}
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/// ditto
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public void alphaBlend(scope Pixel[] target, scope const Pixel[] source) @safe {
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return alphaBlend!(BlendAccuracy.rgba, null)(target, source);
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}
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///
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public void alphaBlend(
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BlendAccuracy accuracy,
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ubyte function(const ubyte, const ubyte) blend = null,
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)(
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ref Pixel pxTarget,
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const Pixel pxSource,
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) @trusted {
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pragma(inline, true);
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static if (accuracy) {
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immutable alphaResult = clamp255(pxSource.a + n255thsOf(pxTarget.a, (0xFF - pxSource.a)));
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//immutable alphaResult = clamp255(pxTarget.a + n255thsOf(pxSource.a, (0xFF - pxTarget.a)));
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}
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immutable alphaSource = (pxSource.a | (pxSource.a << 8));
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immutable alphaTarget = (0xFFFF - alphaSource);
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foreach (immutable ib, ref px; pxTarget.components) {
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static if (blend !is null) {
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immutable bx = blend(px, pxSource.components.ptr[ib]);
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} else {
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immutable bx = pxSource.components.ptr[ib];
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}
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immutable d = cast(ubyte)(((px * alphaTarget) + 0x8080) >> 16);
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immutable s = cast(ubyte)(((bx * alphaSource) + 0x8080) >> 16);
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px = cast(ubyte)(d + s);
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}
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static if (accuracy) {
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pxTarget.a = alphaResult;
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}
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}
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/// ditto
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public void alphaBlend(ref Pixel pxTarget, const Pixel pxSource) @safe {
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return alphaBlend!(BlendAccuracy.rgba, null)(pxTarget, pxSource);
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}
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// ==== Blending functions ====
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/++
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Blend modes
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@ -1002,74 +942,154 @@ alias Blend = BlendMode;
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// undocumented
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enum blendNormal = BlendMode.normal;
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///
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alias BlendFn = ubyte function(const ubyte background, const ubyte foreground) pure nothrow @nogc;
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/++
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Blends pixel `source` into pixel `target`.
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Blends `source` into `target`
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with respect to the opacity of the source image (as stored in the alpha channel).
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See_Also:
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[alphaBlendRGBA] and [alphaBlendRGB] are shorthand functions
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in cases where no special blending algorithm is needed.
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+/
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void blendPixel(BlendMode mode, BlendAccuracy accuracy = BlendAccuracy.rgba)(
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ref Pixel target,
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const Pixel source,
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) if (mode == BlendMode.replace) {
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template alphaBlend(BlendFn blend = null, BlendAccuracy accuracy = BlendAccuracy.rgba) {
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/// ditto
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public void alphaBlend(scope Pixel[] target, scope const Pixel[] source) @trusted
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in (source.length == target.length) {
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foreach (immutable idx, ref pxTarget; target) {
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alphaBlend(pxTarget, source.ptr[idx]);
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}
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}
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/// ditto
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public void alphaBlend(ref Pixel pxTarget, const Pixel pxSource) @trusted {
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pragma(inline, true);
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static if (accuracy == BlendAccuracy.rgba) {
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immutable alphaResult = clamp255(pxSource.a + n255thsOf(pxTarget.a, (0xFF - pxSource.a)));
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//immutable alphaResult = clamp255(pxTarget.a + n255thsOf(pxSource.a, (0xFF - pxTarget.a)));
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}
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immutable alphaSource = (pxSource.a | (pxSource.a << 8));
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immutable alphaTarget = (0xFFFF - alphaSource);
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foreach (immutable ib, ref px; pxTarget.components) {
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static if (blend !is null) {
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immutable bx = blend(px, pxSource.components.ptr[ib]);
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} else {
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immutable bx = pxSource.components.ptr[ib];
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}
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immutable d = cast(ubyte)(((px * alphaTarget) + 0x8080) >> 16);
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immutable s = cast(ubyte)(((bx * alphaSource) + 0x8080) >> 16);
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px = cast(ubyte)(d + s);
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}
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static if (accuracy == BlendAccuracy.rgba) {
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pxTarget.a = alphaResult;
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}
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}
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}
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/// ditto
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template alphaBlend(BlendAccuracy accuracy, BlendFn blend = null) {
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alias alphaBlend = alphaBlend!(blend, accuracy);
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}
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/++
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Blends `source` into `target`
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with respect to the opacity of the source image (as stored in the alpha channel).
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This variant is $(slower than) [alphaBlendRGB],
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but calculates the correct alpha-channel value of the target.
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See [BlendAccuracy] for further explanation.
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+/
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public void alphaBlendRGBA(scope Pixel[] target, scope const Pixel[] source) @safe {
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return alphaBlend!(null, BlendAccuracy.rgba)(target, source);
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}
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/// ditto
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public void alphaBlendRGBA(ref Pixel pxTarget, const Pixel pxSource) @safe {
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return alphaBlend!(null, BlendAccuracy.rgba)(pxTarget, pxSource);
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}
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/++
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Blends `source` into `target`
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with respect to the opacity of the source image (as stored in the alpha channel).
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This variant is $(B faster than) [alphaBlendRGBA],
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but leads to a wrong alpha-channel value in the target.
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Useful because of the performance advantage in cases where the resulting
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alpha does not matter.
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See [BlendAccuracy] for further explanation.
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+/
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public void alphaBlendRGB(scope Pixel[] target, scope const Pixel[] source) @safe {
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return alphaBlend!(null, BlendAccuracy.rgb)(target, source);
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}
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/// ditto
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public void alphaBlendRGB(ref Pixel pxTarget, const Pixel pxSource) @safe {
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return alphaBlend!(null, BlendAccuracy.rgb)(pxTarget, pxSource);
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}
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/++
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Blends pixel `source` into pixel `target`
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using the requested $(B blending mode).
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+/
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template blendPixel(BlendMode mode, BlendAccuracy accuracy = BlendAccuracy.rgba) {
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static if (mode == BlendMode.replace) {
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/// ditto
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void blendPixel(ref Pixel target, const Pixel source) {
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target = source;
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}
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/// ditto
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void blendPixel(BlendMode mode, BlendAccuracy accuracy = BlendAccuracy.rgba)(
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ref Pixel target,
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const Pixel source,
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) if (mode == Blend.alpha) {
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return alphaBlend!accuracy(target, source);
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}
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static if (mode == BlendMode.alpha) {
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/// ditto
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void blendPixel(BlendMode mode, BlendAccuracy accuracy = BlendAccuracy.rgba)(
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ref Pixel target,
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const Pixel source,
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) if (mode == Blend.multiply) {
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void blendPixel(ref Pixel target, const Pixel source) {
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return alphaBlend!accuracy(target, source);
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}
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}
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static if (mode == BlendMode.multiply) {
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/// ditto
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void blendPixel(ref Pixel target, const Pixel source) {
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return alphaBlend!(accuracy,
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(a, b) => n255thsOf(a, b)
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)(target, source);
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}
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}
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static if (mode == BlendMode.screen) {
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/// ditto
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void blendPixel(BlendMode mode, BlendAccuracy accuracy = BlendAccuracy.rgba)(
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ref Pixel target,
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const Pixel source,
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) if (mode == Blend.screen) {
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void blendPixel()(ref Pixel target, const Pixel source) {
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return alphaBlend!(accuracy,
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(a, b) => castTo!ubyte(0xFF - n255thsOf((0xFF - a), (0xFF - b)))
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)(target, source);
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}
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}
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static if (mode == BlendMode.darken) {
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/// ditto
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void blendPixel(BlendMode mode, BlendAccuracy accuracy = BlendAccuracy.rgba)(
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ref Pixel target,
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const Pixel source,
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) if (mode == Blend.darken) {
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void blendPixel()(ref Pixel target, const Pixel source) {
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return alphaBlend!(accuracy,
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(a, b) => min(a, b)
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)(target, source);
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}
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}
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static if (mode == BlendMode.lighten) {
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/// ditto
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void blendPixel(BlendMode mode, BlendAccuracy accuracy = BlendAccuracy.rgba)(
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ref Pixel target,
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const Pixel source,
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) if (mode == Blend.lighten) {
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void blendPixel()(ref Pixel target, const Pixel source) {
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return alphaBlend!(accuracy,
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(a, b) => max(a, b)
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)(target, source);
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}
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}
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static if (mode == BlendMode.overlay) {
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/// ditto
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void blendPixel(BlendMode mode, BlendAccuracy accuracy = BlendAccuracy.rgba)(
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ref Pixel target,
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const Pixel source,
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) if (mode == Blend.overlay) {
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void blendPixel()(ref Pixel target, const Pixel source) {
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return alphaBlend!(accuracy, function(const ubyte b, const ubyte f) {
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if (b < 0x80) {
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return n255thsOf((2 * b).castTo!ubyte, f);
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@ -1079,13 +1099,11 @@ void blendPixel(BlendMode mode, BlendAccuracy accuracy = BlendAccuracy.rgba)(
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);
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})(target, source);
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}
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}
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static if (mode == BlendMode.hardLight) {
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/// ditto
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void blendPixel(BlendMode mode, BlendAccuracy accuracy = BlendAccuracy.rgba)(
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ref Pixel target,
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const Pixel source,
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) if (mode == Blend.hardLight) {
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void blendPixel()(ref Pixel target, const Pixel source) {
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return alphaBlend!(accuracy, function(const ubyte b, const ubyte f) {
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if (f < 0x80) {
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return n255thsOf(castTo!ubyte(2 * f), b);
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@ -1095,13 +1113,11 @@ void blendPixel(BlendMode mode, BlendAccuracy accuracy = BlendAccuracy.rgba)(
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);
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})(target, source);
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}
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}
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static if (mode == BlendMode.softLight) {
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/// ditto
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void blendPixel(BlendMode mode, BlendAccuracy accuracy = BlendAccuracy.rgba)(
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ref Pixel target,
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const Pixel source,
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) if (mode == Blend.softLight) {
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void blendPixel()(ref Pixel target, const Pixel source) {
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return alphaBlend!(accuracy, function(const ubyte b, const ubyte f) {
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if (f < 0x80) {
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// dfmt off
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@ -1125,13 +1141,11 @@ void blendPixel(BlendMode mode, BlendAccuracy accuracy = BlendAccuracy.rgba)(
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);
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})(target, source);
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}
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}
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static if (mode == BlendMode.colorDodge) {
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/// ditto
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void blendPixel(BlendMode mode, BlendAccuracy accuracy = BlendAccuracy.rgba)(
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ref Pixel target,
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const Pixel source,
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) if (mode == Blend.colorDodge) {
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void blendPixel()(ref Pixel target, const Pixel source) {
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return alphaBlend!(accuracy, function(const ubyte b, const ubyte f) {
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if (b == 0x00) {
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return ubyte(0x00);
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@ -1145,13 +1159,11 @@ void blendPixel(BlendMode mode, BlendAccuracy accuracy = BlendAccuracy.rgba)(
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);
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})(target, source);
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}
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}
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static if (mode == BlendMode.colorBurn) {
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/// ditto
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void blendPixel(BlendMode mode, BlendAccuracy accuracy = BlendAccuracy.rgba)(
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ref Pixel target,
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const Pixel source,
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) if (mode == Blend.colorBurn) {
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void blendPixel()(ref Pixel target, const Pixel source) {
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return alphaBlend!(accuracy, function(const ubyte b, const ubyte f) {
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if (b == 0xFF) {
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return ubyte(0xFF);
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@ -1167,57 +1179,55 @@ void blendPixel(BlendMode mode, BlendAccuracy accuracy = BlendAccuracy.rgba)(
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return castTo!ubyte(0xFF - m);
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})(target, source);
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}
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}
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static if (mode == BlendMode.difference) {
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/// ditto
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void blendPixel(BlendMode mode, BlendAccuracy accuracy = BlendAccuracy.rgba)(
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ref Pixel target,
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const Pixel source,
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) if (mode == Blend.difference) {
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void blendPixel()(ref Pixel target, const Pixel source) {
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return alphaBlend!(accuracy,
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(b, f) => (b > f) ? castTo!ubyte(b - f) : castTo!ubyte(f - b)
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)(target, source);
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}
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}
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static if (mode == BlendMode.exclusion) {
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/// ditto
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void blendPixel(BlendMode mode, BlendAccuracy accuracy = BlendAccuracy.rgba)(
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ref Pixel target,
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const Pixel source,
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) if (mode == Blend.exclusion) {
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void blendPixel()(ref Pixel target, const Pixel source) {
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return alphaBlend!(accuracy,
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(b, f) => castTo!ubyte(b + f - (2 * n255thsOf(f, b)))
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)(target, source);
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}
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}
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static if (mode == BlendMode.subtract) {
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/// ditto
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void blendPixel(BlendMode mode, BlendAccuracy accuracy = BlendAccuracy.rgba)(
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ref Pixel target,
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const Pixel source,
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) if (mode == Blend.subtract) {
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void blendPixel()(ref Pixel target, const Pixel source) {
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return alphaBlend!(accuracy,
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(b, f) => (b > f) ? castTo!ubyte(b - f) : ubyte(0)
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)(target, source);
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}
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}
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static if (mode == BlendMode.divide) {
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/// ditto
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void blendPixel(BlendMode mode, BlendAccuracy accuracy = BlendAccuracy.rgba)(
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ref Pixel target,
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const Pixel source,
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) if (mode == Blend.divide) {
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void blendPixel()(ref Pixel target, const Pixel source) {
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return alphaBlend!(accuracy,
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(b, f) => (f == 0) ? ubyte(0xFF) : clamp255(0xFF * b / f)
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)(target, source);
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}
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}
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}
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/++
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Blends the pixel data of `source` into `target`.
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Blends the pixel data of `source` into `target`
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using the requested $(B blending mode).
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`source` and `target` MUST have the same length.
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+/
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void blendPixels(BlendMode mode, BlendAccuracy accuracy)(scope Pixel[] target, scope const Pixel[] source) @trusted
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void blendPixels(
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BlendMode mode,
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BlendAccuracy accuracy,
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)(scope Pixel[] target, scope const Pixel[] source) @trusted
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in (source.length == target.length) {
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static if (mode == BlendMode.replace) {
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// explicit optimization
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@ -1236,11 +1246,7 @@ in (source.length == target.length) {
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}
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/// ditto
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void blendPixels(BlendAccuracy accuracy = BlendAccuracy.rgba)(
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scope Pixel[] target,
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scope const Pixel[] source,
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BlendMode mode,
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) {
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void blendPixels(BlendAccuracy accuracy)(scope Pixel[] target, scope const Pixel[] source, BlendMode mode) {
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import std.meta : NoDuplicates;
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import std.traits : EnumMembers;
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