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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 half2 center;
in half radius;
half2 prevCenter;
half 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 half4 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 caclulation is performed in a space normalized to the
// radius and then denormalized. This is to prevent overflow on devices that have a "real"
// mediump. It'd be nice to only do this on mediump devices.
half d;
@if (edgeType == GrClipEdgeType::kInverseFillBW ||
edgeType == GrClipEdgeType::kInverseFillAA) {
d = (length((circle.xy - sk_FragCoord.xy) * circle.w) - 1.0) * circle.z;
} else {
d = (1.0 - length((circle.xy - sk_FragCoord.xy) * circle.w)) * circle.z;
}
@if (edgeType == GrClipEdgeType::kFillAA ||
edgeType == GrClipEdgeType::kInverseFillAA ||
edgeType == GrClipEdgeType::kHairlineAA) {
d = clamp(d, 0.0, 1.0);
} else {
d = d > 0.5 ? 1.0 : 0.0;
}
sk_OutColor = sk_InColor * d;
}
@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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