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/*
* Copyright 2010 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrEffectStage_DEFINED
#define GrEffectStage_DEFINED
#include "GrBackendEffectFactory.h"
#include "GrEffect.h"
#include "SkMatrix.h"
#include "GrTypes.h"
#include "SkShader.h"
class GrEffectStage {
public:
explicit GrEffectStage(const GrEffectRef* effectRef, int attrIndex0 = -1, int attrIndex1 = -1)
: fEffectRef(SkRef(effectRef)) {
fCoordChangeMatrixSet = false;
fVertexAttribIndices[0] = attrIndex0;
fVertexAttribIndices[1] = attrIndex1;
}
GrEffectStage(const GrEffectStage& other) {
*this = other;
}
GrEffectStage& operator= (const GrEffectStage& other) {
fCoordChangeMatrixSet = other.fCoordChangeMatrixSet;
if (other.fCoordChangeMatrixSet) {
fCoordChangeMatrix = other.fCoordChangeMatrix;
}
fEffectRef.reset(SkRef(other.fEffectRef.get()));
memcpy(fVertexAttribIndices, other.fVertexAttribIndices, sizeof(fVertexAttribIndices));
return *this;
}
bool operator== (const GrEffectStage& other) const {
SkASSERT(NULL != fEffectRef.get());
SkASSERT(NULL != other.fEffectRef.get());
if (!(*this->getEffect())->isEqual(*other.getEffect())) {
return false;
}
if (fCoordChangeMatrixSet != other.fCoordChangeMatrixSet) {
return false;
}
if (!fCoordChangeMatrixSet) {
return true;
}
return fCoordChangeMatrix == other.fCoordChangeMatrix;
}
bool operator!= (const GrEffectStage& s) const { return !(*this == s); }
/**
* This is called when the coordinate system in which the geometry is specified will change.
*
* @param matrix The transformation from the old coord system in which geometry is specified
* to the new one from which it will actually be drawn.
*/
void localCoordChange(const SkMatrix& matrix) {
if (fCoordChangeMatrixSet) {
fCoordChangeMatrix.preConcat(matrix);
} else {
fCoordChangeMatrixSet = true;
fCoordChangeMatrix = matrix;
}
}
class SavedCoordChange {
private:
bool fCoordChangeMatrixSet;
SkMatrix fCoordChangeMatrix;
SkDEBUGCODE(mutable SkAutoTUnref<const GrEffectRef> fEffectRef;)
friend class GrEffectStage;
};
/**
* This gets the current coordinate system change. It is the accumulation of
* localCoordChange calls since the effect was installed. It is used when then caller
* wants to temporarily change the source geometry coord system, draw something, and then
* restore the previous coord system (e.g. temporarily draw in device coords).
*/
void saveCoordChange(SavedCoordChange* savedCoordChange) const {
savedCoordChange->fCoordChangeMatrixSet = fCoordChangeMatrixSet;
if (fCoordChangeMatrixSet) {
savedCoordChange->fCoordChangeMatrix = fCoordChangeMatrix;
}
SkASSERT(NULL == savedCoordChange->fEffectRef.get());
SkDEBUGCODE(SkRef(fEffectRef.get());)
SkDEBUGCODE(savedCoordChange->fEffectRef.reset(fEffectRef.get());)
}
/**
* This balances the saveCoordChange call.
*/
void restoreCoordChange(const SavedCoordChange& savedCoordChange) {
fCoordChangeMatrixSet = savedCoordChange.fCoordChangeMatrixSet;
if (fCoordChangeMatrixSet) {
fCoordChangeMatrix = savedCoordChange.fCoordChangeMatrix;
}
SkASSERT(savedCoordChange.fEffectRef.get() == fEffectRef);
SkDEBUGCODE(savedCoordChange.fEffectRef.reset(NULL);)
}
/**
* Gets the matrix representing all changes of coordinate system since the GrEffect was
* installed in the stage.
*/
const SkMatrix& getCoordChangeMatrix() const {
if (fCoordChangeMatrixSet) {
return fCoordChangeMatrix;
} else {
return SkMatrix::I();
}
}
const GrEffectRef* getEffect() const { return fEffectRef.get(); }
const int* getVertexAttribIndices() const { return fVertexAttribIndices; }
int getVertexAttribIndexCount() const { return fEffectRef->get()->numVertexAttribs(); }
private:
bool fCoordChangeMatrixSet;
SkMatrix fCoordChangeMatrix;
SkAutoTUnref<const GrEffectRef> fEffectRef;
int fVertexAttribIndices[2];
};
#endif
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