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- /*
- * Copyright 2017 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
- layout(key) in GrClipEdgeType edgeType;
- in float2 center;
- in float radius;
- float2 prevCenter;
- float prevRadius = -1;
- // The circle uniform is (center.x, center.y, radius + 0.5, 1 / (radius + 0.5)) for regular
- // fills and (..., radius - 0.5, 1 / (radius - 0.5)) for inverse fills.
- uniform float4 circle;
- @make {
- static std::unique_ptr<GrFragmentProcessor> Make(GrClipEdgeType edgeType, SkPoint center,
- float radius) {
- // A radius below half causes the implicit insetting done by this processor to become
- // inverted. We could handle this case by making the processor code more complicated.
- if (radius < .5f && GrProcessorEdgeTypeIsInverseFill(edgeType)) {
- return nullptr;
- }
- return std::unique_ptr<GrFragmentProcessor>(new GrCircleEffect(edgeType, center, radius));
- }
- }
- @optimizationFlags { kCompatibleWithCoverageAsAlpha_OptimizationFlag }
- @setData(pdman) {
- if (radius != prevRadius || center != prevCenter) {
- SkScalar effectiveRadius = radius;
- if (GrProcessorEdgeTypeIsInverseFill((GrClipEdgeType) edgeType)) {
- effectiveRadius -= 0.5f;
- // When the radius is 0.5 effectiveRadius is 0 which causes an inf * 0 in the shader.
- effectiveRadius = SkTMax(0.001f, effectiveRadius);
- } else {
- effectiveRadius += 0.5f;
- }
- pdman.set4f(circle, center.fX, center.fY, effectiveRadius,
- SkScalarInvert(effectiveRadius));
- prevCenter = center;
- prevRadius = radius;
- }
- }
- void main() {
- // TODO: Right now the distance to circle calculation is performed in a space normalized to the
- // radius and then denormalized. This is to mitigate overflow on devices that don't have full
- // float.
- half d;
- @if (edgeType == GrClipEdgeType::kInverseFillBW ||
- edgeType == GrClipEdgeType::kInverseFillAA) {
- d = half((length((circle.xy - sk_FragCoord.xy) * circle.w) - 1.0) * circle.z);
- } else {
- d = half((1.0 - length((circle.xy - sk_FragCoord.xy) * circle.w)) * circle.z);
- }
- @if (edgeType == GrClipEdgeType::kFillAA ||
- edgeType == GrClipEdgeType::kInverseFillAA ||
- edgeType == GrClipEdgeType::kHairlineAA) {
- sk_OutColor = sk_InColor * saturate(d);
- } else {
- sk_OutColor = d > 0.5 ? sk_InColor : half4(0);
- }
- }
- @test(testData) {
- SkPoint center;
- center.fX = testData->fRandom->nextRangeScalar(0.f, 1000.f);
- center.fY = testData->fRandom->nextRangeScalar(0.f, 1000.f);
- SkScalar radius = testData->fRandom->nextRangeF(1.f, 1000.f);
- GrClipEdgeType et;
- do {
- et = (GrClipEdgeType) testData->fRandom->nextULessThan(kGrClipEdgeTypeCnt);
- } while (GrClipEdgeType::kHairlineAA == et);
- return GrCircleEffect::Make(et, center, radius);
- }
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