Simplify GetRuntimeBlendForBlendMode.
Now that we support sampling from an SkBlender inside a Runtime Effect,
we can leverage that to reuse the blends from SkBlender::Mode. This lets
us avoid hard-coding copies of every built-in blend function.
Change-Id: I51f380490611fbde943c16648999b4fd4e6a14a9
Bug: skia:12257, skia:12085
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/434472
Commit-Queue: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
diff --git a/tools/RuntimeBlendUtils.cpp b/tools/RuntimeBlendUtils.cpp
index a82c9f0..2eb35dd 100644
--- a/tools/RuntimeBlendUtils.cpp
+++ b/tools/RuntimeBlendUtils.cpp
@@ -7,364 +7,19 @@
#include "include/core/SkBlendMode.h"
#include "include/core/SkRefCnt.h"
-#include "include/core/SkString.h"
#include "include/effects/SkRuntimeEffect.h"
-static sk_sp<SkBlender> blender_func(std::initializer_list<const char*> code) {
- SkString concat;
- for (const char* part : code) {
- concat.append(part);
- }
- SkRuntimeEffect::Result result = SkRuntimeEffect::MakeForBlender(std::move(concat));
- SkASSERTF(result.effect, "%s", result.errorText.c_str());
- return result.effect->makeBlender(/*uniforms=*/nullptr);
-}
-
-static sk_sp<SkBlender> blender_expr(const char* returnExpr) {
- return blender_func({"half4 main(half4 src, half4 dst) {\n"
- " return ", returnExpr, ";\n"
- "}"});
-}
-
sk_sp<SkBlender> GetRuntimeBlendForBlendMode(SkBlendMode mode) {
- static constexpr char kGuardedDivide[] = R"(
- half _guarded_divide(half n, half d) {
- return n/(d + 0.00000001);
+ static auto result = SkRuntimeEffect::MakeForBlender(SkString(R"(
+ uniform blender b;
+ half4 main(half4 src, half4 dst) {
+ return sample(b, src, dst);
}
+ )"));
- half3 _guarded_divide(half3 n, half d) {
- return n/(d + 0.00000001);
- }
- )";
+ SkASSERTF(result.effect, "%s", result.errorText.c_str());
- static constexpr char kHSLCSharedCode[] = R"(
- half _blend_color_luminance(half3 color) { return dot(half3(0.3, 0.59, 0.11), color); }
-
- half3 _blend_set_color_luminance(half3 hueSatColor, half alpha, half3 lumColor) {
- half lum = _blend_color_luminance(lumColor);
- half3 result = lum - _blend_color_luminance(hueSatColor) + hueSatColor;
- half minComp = min(min(result.r, result.g), result.b);
- half maxComp = max(max(result.r, result.g), result.b);
- if (minComp < 0 && lum != minComp) {
- result = lum + (result - lum) * _guarded_divide(lum, (lum - minComp));
- }
- if (maxComp > alpha && maxComp != lum) {
- return lum + _guarded_divide((result - lum) * (alpha - lum), (maxComp - lum));
- } else {
- return result;
- }
- }
-
- half _blend_color_saturation(half3 color) {
- return max(max(color.r, color.g), color.b) - min(min(color.r, color.g), color.b);
- }
-
- half3 _blend_set_color_saturation_helper(half3 minMidMax, half sat) {
- if (minMidMax.r < minMidMax.b) {
- return half3(0,
- _guarded_divide(sat*(minMidMax.g - minMidMax.r),
- (minMidMax.b - minMidMax.r)),
- sat);
- } else {
- return half3(0);
- }
- }
-
- half3 _blend_set_color_saturation(half3 hueLumColor, half3 satColor) {
- half sat = _blend_color_saturation(satColor);
- if (hueLumColor.r <= hueLumColor.g) {
- if (hueLumColor.g <= hueLumColor.b) {
- return _blend_set_color_saturation_helper(hueLumColor.rgb, sat);
- } else if (hueLumColor.r <= hueLumColor.b) {
- return _blend_set_color_saturation_helper(hueLumColor.rbg, sat).rbg;
- } else {
- return _blend_set_color_saturation_helper(hueLumColor.brg, sat).gbr;
- }
- } else if (hueLumColor.r <= hueLumColor.b) {
- return _blend_set_color_saturation_helper(hueLumColor.grb, sat).grb;
- } else if (hueLumColor.g <= hueLumColor.b) {
- return _blend_set_color_saturation_helper(hueLumColor.gbr, sat).brg;
- } else {
- return _blend_set_color_saturation_helper(hueLumColor.bgr, sat).bgr;
- }
- }
- )";
-
- switch (mode) {
- case SkBlendMode::kClear: {
- static auto blender = blender_expr("half4(0)");
- return blender;
- }
- case SkBlendMode::kSrc: {
- static auto blender = blender_expr("src");
- return blender;
- }
- case SkBlendMode::kDst: {
- static auto blender = blender_expr("dst");
- return blender;
- }
- case SkBlendMode::kSrcOver: {
- static auto blender = blender_expr("src + (1 - src.a)*dst");
- return blender;
- }
- case SkBlendMode::kDstOver: {
- static auto blender = blender_expr("(1 - dst.a)*src + dst");
- return blender;
- }
- case SkBlendMode::kSrcIn: {
- static auto blender = blender_expr("(src == half4(0) ? half4(0) : src*dst.a)");
- return blender;
- }
- case SkBlendMode::kDstIn: {
- static auto blender = blender_expr("(dst == half4(0) ? half4(0) : dst*src.a)");
- return blender;
- }
- case SkBlendMode::kSrcOut: {
- static auto blender = blender_expr("(1 - dst.a)*src");
- return blender;
- }
- case SkBlendMode::kDstOut: {
- static auto blender = blender_expr("(1 - src.a)*dst");
- return blender;
- }
- case SkBlendMode::kSrcATop: {
- static auto blender = blender_expr("dst.a*src + (1 - src.a)*dst");
- return blender;
- }
- case SkBlendMode::kDstATop: {
- static auto blender = blender_expr("(1 - dst.a) * src + src.a*dst");
- return blender;
- }
- case SkBlendMode::kXor: {
- static auto blender = blender_expr("(1 - dst.a)*src + (1 - src.a)*dst");
- return blender;
- }
- case SkBlendMode::kPlus: {
- static auto blender = blender_expr("min(src + dst, 1)");
- return blender;
- }
- case SkBlendMode::kModulate: {
- static auto blender = blender_expr("src*dst");
- return blender;
- }
- case SkBlendMode::kScreen: {
- static auto blender = blender_expr("src + (1 - src)*dst");
- return blender;
- }
- case SkBlendMode::kOverlay: {
- static auto blender = blender_func({R"(
- half _blend_overlay_component(half2 s, half2 d) {
- return (2*d.x <= d.y)
- ? 2*s.x*d.x
- : s.y*d.y - 2*(d.y - d.x)*(s.y - s.x);
- }
-
- half4 main(half4 src, half4 dst) {
- half4 result = half4(_blend_overlay_component(src.ra, dst.ra),
- _blend_overlay_component(src.ga, dst.ga),
- _blend_overlay_component(src.ba, dst.ba),
- src.a + (1 - src.a)*dst.a);
- result.rgb += dst.rgb*(1 - src.a) + src.rgb*(1 - dst.a);
- return result;
- }
- )"});
- return blender;
- }
- case SkBlendMode::kDarken: {
- static auto blender = blender_func({R"(
- half4 main(half4 src, half4 dst) {
- half4 result = src + (1 - src.a)*dst;
- result.rgb = min(result.rgb, (1 - dst.a)*src.rgb + dst.rgb);
- return result;
- }
- )"});
- return blender;
- }
- case SkBlendMode::kLighten: {
- static auto blender = blender_func({R"(
- half4 main(half4 src, half4 dst) {
- half4 result = src + (1 - src.a)*dst;
- result.rgb = max(result.rgb, (1 - dst.a)*src.rgb + dst.rgb);
- return result;
- }
- )"});
- return blender;
- }
- case SkBlendMode::kColorDodge: {
- static auto blender = blender_func({kGuardedDivide, R"(
- half _color_dodge_component(half2 s, half2 d) {
- if (d.x == 0) {
- return s.x*(1 - d.y);
- } else {
- half delta = s.y - s.x;
- if (delta == 0) {
- return s.y*d.y + s.x*(1 - d.y) + d.x*(1 - s.y);
- } else {
- delta = min(d.y, _guarded_divide(d.x*s.y, delta));
- return delta*s.y + s.x*(1 - d.y) + d.x*(1 - s.y);
- }
- }
- }
-
- half4 main(half4 src, half4 dst) {
- return half4(_color_dodge_component(src.ra, dst.ra),
- _color_dodge_component(src.ga, dst.ga),
- _color_dodge_component(src.ba, dst.ba),
- src.a + (1 - src.a)*dst.a);
- }
- )"});
- return blender;
- }
- case SkBlendMode::kColorBurn: {
- static auto blender = blender_func({kGuardedDivide, R"(
- half _color_burn_component(half2 s, half2 d) {
- if (d.y == d.x) {
- return s.y*d.y + s.x*(1 - d.y) + d.x*(1 - s.y);
- } else if (s.x == 0) {
- return d.x*(1 - s.y);
- } else {
- half delta = max(0, d.y - _guarded_divide((d.y - d.x)*s.y, s.x));
- return delta*s.y + s.x*(1 - d.y) + d.x*(1 - s.y);
- }
- }
-
- half4 main(half4 src, half4 dst) {
- return half4(_color_burn_component(src.ra, dst.ra),
- _color_burn_component(src.ga, dst.ga),
- _color_burn_component(src.ba, dst.ba),
- src.a + (1 - src.a)*dst.a);
- }
- )"});
- return blender;
- }
- case SkBlendMode::kHardLight: {
- static auto blender = blender_func({R"(
- half _blend_overlay_component(half2 s, half2 d) {
- return (2*d.x <= d.y)
- ? 2*s.x*d.x
- : s.y*d.y - 2*(d.y - d.x)*(s.y - s.x);
- }
-
- half4 main(half4 dst, half4 src) {
- half4 result = half4(_blend_overlay_component(src.ra, dst.ra),
- _blend_overlay_component(src.ga, dst.ga),
- _blend_overlay_component(src.ba, dst.ba),
- src.a + (1 - src.a)*dst.a);
- result.rgb += dst.rgb*(1 - src.a) + src.rgb*(1 - dst.a);
- return result;
- }
- )"});
- return blender;
- }
- case SkBlendMode::kSoftLight: {
- static auto blender = blender_func({kGuardedDivide, R"(
- half _soft_light_component(half2 s, half2 d) {
- if (2*s.x <= s.y) {
- return _guarded_divide(d.x*d.x*(s.y - 2*s.x), d.y) +
- (1 - d.y)*s.x + d.x*(-s.y + 2*s.x + 1);
- } else if (4.0 * d.x <= d.y) {
- half DSqd = d.x*d.x;
- half DCub = DSqd*d.x;
- half DaSqd = d.y*d.y;
- half DaCub = DaSqd*d.y;
- return _guarded_divide(DaSqd*(s.x - d.x*(3*s.y - 6*s.x - 1))
- + 12*d.y*DSqd*(s.y - 2*s.x)
- - 16*DCub * (s.y - 2*s.x) - DaCub*s.x, DaSqd);
- } else {
- return d.x*(s.y - 2*s.x + 1) + s.x - sqrt(d.y*d.x)*(s.y - 2*s.x) - d.y*s.x;
- }
- }
-
- half4 main(half4 src, half4 dst) {
- return (dst.a == 0) ? src : half4(_soft_light_component(src.ra, dst.ra),
- _soft_light_component(src.ga, dst.ga),
- _soft_light_component(src.ba, dst.ba),
- src.a + (1 - src.a)*dst.a);
- }
- )"});
- return blender;
- }
- case SkBlendMode::kDifference: {
- static auto blender = blender_func({R"(
- half4 main(half4 src, half4 dst) {
- return half4(src.rgb + dst.rgb - 2*min(src.rgb*dst.a, dst.rgb*src.a),
- src.a + (1 - src.a)*dst.a);
- }
- )"});
- return blender;
- }
- case SkBlendMode::kExclusion: {
- static auto blender = blender_func({R"(
- half4 main(half4 src, half4 dst) {
- return half4(dst.rgb + src.rgb - 2*dst.rgb*src.rgb, src.a + (1 - src.a)*dst.a);
- }
- )"});
- return blender;
- }
- case SkBlendMode::kMultiply: {
- static auto blender = blender_func({R"(
- half4 main(half4 src, half4 dst) {
- return half4((1 - src.a)*dst.rgb + (1 - dst.a)*src.rgb + src.rgb*dst.rgb,
- src.a + (1 - src.a)*dst.a);
- }
- )"});
- return blender;
- }
- case SkBlendMode::kHue: {
- static auto blender = blender_func({kGuardedDivide, kHSLCSharedCode, R"(
- half4 main(half4 src, half4 dst) {
- half alpha = dst.a*src.a;
- half3 sda = src.rgb*dst.a;
- half3 dsa = dst.rgb*src.a;
- return half4(_blend_set_color_luminance(_blend_set_color_saturation(sda, dsa),
- alpha, dsa) +
- dst.rgb - dsa + src.rgb - sda,
- src.a + dst.a - alpha);
- }
- )"});
- return blender;
- }
- case SkBlendMode::kSaturation: {
- static auto blender = blender_func({kGuardedDivide, kHSLCSharedCode, R"(
- half4 main(half4 src, half4 dst) {
- half alpha = dst.a*src.a;
- half3 sda = src.rgb*dst.a;
- half3 dsa = dst.rgb*src.a;
- return half4(_blend_set_color_luminance(_blend_set_color_saturation(dsa, sda),
- alpha, dsa) +
- dst.rgb - dsa + src.rgb - sda,
- src.a + dst.a - alpha);
- }
- )"});
- return blender;
- }
- case SkBlendMode::kColor: {
- static auto blender = blender_func({kGuardedDivide, kHSLCSharedCode, R"(
- half4 main(half4 src, half4 dst) {
- half alpha = dst.a*src.a;
- half3 sda = src.rgb*dst.a;
- half3 dsa = dst.rgb*src.a;
- return half4(_blend_set_color_luminance(sda, alpha, dsa) + dst.rgb
- - dsa + src.rgb - sda, src.a + dst.a - alpha);
- }
- )"});
- return blender;
- }
- case SkBlendMode::kLuminosity: {
- static auto blender = blender_func({kGuardedDivide, kHSLCSharedCode, R"(
- half4 main(half4 src, half4 dst) {
- half alpha = dst.a*src.a;
- half3 sda = src.rgb*dst.a;
- half3 dsa = dst.rgb*src.a;
- return half4(_blend_set_color_luminance(dsa, alpha, sda) + dst.rgb - dsa
- + src.rgb - sda, src.a + dst.a - alpha);
- }
- )"});
- return blender;
- }
- default:
- SkDEBUGFAILF("unrecognized blend mode %d", (int)mode);
- return nullptr;
- }
+ SkRuntimeBlendBuilder builder(result.effect);
+ builder.child("b") = SkBlender::Mode(mode);
+ return builder.makeBlender();
}
-
diff --git a/tools/RuntimeBlendUtils.h b/tools/RuntimeBlendUtils.h
index b9ee07f..d92f0bb 100644
--- a/tools/RuntimeBlendUtils.h
+++ b/tools/RuntimeBlendUtils.h
@@ -13,7 +13,12 @@
class SkBlender;
-/** Returns a Runtime Effect-based blender which is equivalent to the passed-in SkBlendMode. */
+/**
+ * Returns a Runtime Effect-based blender which is equivalent to the passed-in SkBlendMode.
+ * This should generate the same output as the equivalent SkBlendMode operation, but always uses
+ * SkSL to perform the blend operation instead of relying on specialized/fixed-function code.
+ * This is useful for verifying that Runtime Blends are working as expected throughout the pipeline.
+ */
sk_sp<SkBlender> GetRuntimeBlendForBlendMode(SkBlendMode mode);
#endif
