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/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrMatrixConvolutionEffect_DEFINED
#define GrMatrixConvolutionEffect_DEFINED
#include "GrSingleTextureEffect.h"
#include "GrInvariantOutput.h"
#include "GrTextureDomain.h"
// A little bit less than the minimum # uniforms required by DX9SM2 (32).
// Allows for a 5x5 kernel (or 25x1, for that matter).
#define MAX_KERNEL_SIZE 25
class GrMatrixConvolutionEffect : public GrSingleTextureEffect {
public:
static sk_sp<GrFragmentProcessor> Make(GrTexture* texture,
const SkIRect& bounds,
const SkISize& kernelSize,
const SkScalar* kernel,
SkScalar gain,
SkScalar bias,
const SkIPoint& kernelOffset,
GrTextureDomain::Mode tileMode,
bool convolveAlpha) {
return sk_sp<GrFragmentProcessor>(
new GrMatrixConvolutionEffect(texture, bounds, kernelSize, kernel, gain, bias,
kernelOffset, tileMode, convolveAlpha));
}
static sk_sp<GrFragmentProcessor> MakeGaussian(GrTexture* texture,
const SkIRect& bounds,
const SkISize& kernelSize,
SkScalar gain,
SkScalar bias,
const SkIPoint& kernelOffset,
GrTextureDomain::Mode tileMode,
bool convolveAlpha,
SkScalar sigmaX,
SkScalar sigmaY);
const SkIRect& bounds() const { return fBounds; }
const SkISize& kernelSize() const { return fKernelSize; }
const float* kernelOffset() const { return fKernelOffset; }
const float* kernel() const { return fKernel; }
float gain() const { return fGain; }
float bias() const { return fBias; }
bool convolveAlpha() const { return fConvolveAlpha; }
const GrTextureDomain& domain() const { return fDomain; }
const char* name() const override { return "MatrixConvolution"; }
private:
GrMatrixConvolutionEffect(GrTexture*,
const SkIRect& bounds,
const SkISize& kernelSize,
const SkScalar* kernel,
SkScalar gain,
SkScalar bias,
const SkIPoint& kernelOffset,
GrTextureDomain::Mode tileMode,
bool convolveAlpha);
GrGLSLFragmentProcessor* onCreateGLSLInstance() const override;
void onGetGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder*) const override;
bool onIsEqual(const GrFragmentProcessor&) const override;
void onComputeInvariantOutput(GrInvariantOutput* inout) const override {
// TODO: Try to do better?
inout->mulByUnknownFourComponents();
}
SkIRect fBounds;
SkISize fKernelSize;
float fKernel[MAX_KERNEL_SIZE];
float fGain;
float fBias;
float fKernelOffset[2];
bool fConvolveAlpha;
GrTextureDomain fDomain;
GR_DECLARE_FRAGMENT_PROCESSOR_TEST;
typedef GrSingleTextureEffect INHERITED;
};
#endif
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