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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrBicubicTextureEffect_DEFINED
#define GrBicubicTextureEffect_DEFINED
#include "GrTextureDomain.h"
#include "glsl/GrGLSLFragmentProcessor.h"
class GrInvariantOutput;
class GrBicubicEffect : public GrFragmentProcessor {
public:
enum {
kFilterTexelPad = 2, // Given a src rect in texels to be filtered, this number of
// surrounding texels are needed by the kernel in x and y.
};
const char* name() const override { return "Bicubic"; }
std::unique_ptr<GrFragmentProcessor> clone() const override {
return std::unique_ptr<GrFragmentProcessor>(new GrBicubicEffect(*this));
}
const GrTextureDomain& domain() const { return fDomain; }
/**
* Create a Mitchell filter effect with specified texture matrix and x/y tile modes.
*/
static std::unique_ptr<GrFragmentProcessor> Make(sk_sp<GrTextureProxy> proxy,
const SkMatrix& matrix,
const GrSamplerState::WrapMode wrapModes[2]) {
return std::unique_ptr<GrFragmentProcessor>(new GrBicubicEffect(std::move(proxy), matrix,
wrapModes));
}
/**
* Create a Mitchell filter effect with a texture matrix and a domain.
*/
static std::unique_ptr<GrFragmentProcessor> Make(sk_sp<GrTextureProxy> proxy,
const SkMatrix& matrix,
const SkRect& domain) {
return std::unique_ptr<GrFragmentProcessor>(new GrBicubicEffect(std::move(proxy), matrix,
domain));
}
/**
* Determines whether the bicubic effect should be used based on the transformation from the
* local coords to the device. Returns true if the bicubic effect should be used. filterMode
* is set to appropriate filtering mode to use regardless of the return result (e.g. when this
* returns false it may indicate that the best fallback is to use kMipMap, kBilerp, or
* kNearest).
*/
static bool ShouldUseBicubic(const SkMatrix& localCoordsToDevice,
GrSamplerState::Filter* filterMode);
private:
GrBicubicEffect(sk_sp<GrTextureProxy>, const SkMatrix& matrix,
const GrSamplerState::WrapMode wrapModes[2]);
GrBicubicEffect(sk_sp<GrTextureProxy>, const SkMatrix &matrix, const SkRect& domain);
explicit GrBicubicEffect(const GrBicubicEffect&);
GrGLSLFragmentProcessor* onCreateGLSLInstance() const override;
void onGetGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder*) const override;
bool onIsEqual(const GrFragmentProcessor&) const override;
GrCoordTransform fCoordTransform;
GrTextureDomain fDomain;
TextureSampler fTextureSampler;
GR_DECLARE_FRAGMENT_PROCESSOR_TEST
typedef GrFragmentProcessor INHERITED;
};
#endif
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