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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrCircleBlurFragmentProcessor_DEFINED
#define GrCircleBlurFragmentProcessor_DEFINED
#include "SkString.h"
#include "SkTypes.h"
#if SK_SUPPORT_GPU
#include "GrFragmentProcessor.h"
#include "GrProcessorUnitTest.h"
class GrTextureProvider;
// This FP handles the special case of a blurred circle. It uses a 1D
// profile that is just rotated about the origin of the circle.
class GrCircleBlurFragmentProcessor : public GrFragmentProcessor {
public:
~GrCircleBlurFragmentProcessor() override {}
const char* name() const override { return "CircleBlur"; }
SkString dumpInfo() const override {
SkString str;
str.appendf("Rect [L: %.2f, T: %.2f, R: %.2f, B: %.2f], solidR: %.2f, textureR: %.2f",
fCircle.fLeft, fCircle.fTop, fCircle.fRight, fCircle.fBottom,
fSolidRadius, fTextureRadius);
return str;
}
static sk_sp<GrFragmentProcessor> Make(GrTextureProvider*textureProvider,
const SkRect& circle, float sigma);
private:
// This nested GLSL processor implementation is defined in the cpp file.
class GLSLProcessor;
/**
* Creates a profile texture for the circle and sigma. The texture will have a height of 1.
* The x texture coord should map from 0 to 1 across the radius range of solidRadius to
* solidRadius + textureRadius.
*/
GrCircleBlurFragmentProcessor(const SkRect& circle, float textureRadius, float innerRadius,
GrTexture* blurProfile);
GrGLSLFragmentProcessor* onCreateGLSLInstance() const override;
void onGetGLSLProcessorKey(const GrShaderCaps& caps, GrProcessorKeyBuilder* b) const override;
bool onIsEqual(const GrFragmentProcessor& other) const override {
const GrCircleBlurFragmentProcessor& cbfp = other.cast<GrCircleBlurFragmentProcessor>();
return fCircle == cbfp.fCircle && fSolidRadius == cbfp.fSolidRadius &&
fTextureRadius == cbfp.fTextureRadius;
}
SkRect fCircle;
SkScalar fSolidRadius;
float fTextureRadius;
TextureSampler fBlurProfileSampler;
GR_DECLARE_FRAGMENT_PROCESSOR_TEST;
typedef GrFragmentProcessor INHERITED;
};
#endif
#endif
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