blob: 4d39ec8e11f661c76f09a028b51e5d6e7151bc3e [file] [log] [blame]
/*
* 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 "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"; }
static const GrFragmentProcessor* Create(GrTextureProvider*textureProvider,
const SkRect& circle, float sigma) {
float offset;
SkAutoTUnref<GrTexture> blurProfile(CreateCircleBlurProfileTexture(textureProvider,
circle,
sigma,
&offset));
if (!blurProfile) {
return nullptr;
}
return new GrCircleBlurFragmentProcessor(circle, sigma, offset, blurProfile);
}
const SkRect& circle() const { return fCircle; }
float sigma() const { return fSigma; }
float offset() const { return fOffset; }
int profileSize() const { return fBlurProfileAccess.getTexture()->width(); }
private:
GrCircleBlurFragmentProcessor(const SkRect& circle, float sigma,
float offset, GrTexture* blurProfile);
GrGLFragmentProcessor* onCreateGLInstance() const override;
void onGetGLProcessorKey(const GrGLSLCaps& caps, GrProcessorKeyBuilder* b) const override;
bool onIsEqual(const GrFragmentProcessor& other) const override {
const GrCircleBlurFragmentProcessor& cbfp = other.cast<GrCircleBlurFragmentProcessor>();
// fOffset is computed from the circle width and the sigma
return this->circle().width() == cbfp.circle().width() && fSigma == cbfp.fSigma;
}
void onComputeInvariantOutput(GrInvariantOutput* inout) const override;
static GrTexture* CreateCircleBlurProfileTexture(GrTextureProvider*,
const SkRect& circle,
float sigma, float* offset);
SkRect fCircle;
float fSigma;
float fOffset;
GrTextureAccess fBlurProfileAccess;
GR_DECLARE_FRAGMENT_PROCESSOR_TEST;
typedef GrFragmentProcessor INHERITED;
};
#endif
#endif