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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:
GrEffectStage()
: fEffectRef (NULL) {
GR_DEBUGCODE(fSavedCoordChangeCnt = 0;)
}
~GrEffectStage() {
GrSafeUnref(fEffectRef);
GrAssert(0 == fSavedCoordChangeCnt);
}
bool operator ==(const GrEffectStage& other) const {
// first handle cases where one or the other has no effect
if (NULL == fEffectRef) {
return NULL == other.fEffectRef;
} else if (NULL == other.fEffectRef) {
return false;
}
if (!(*this->getEffect())->isEqual(*other.getEffect())) {
return false;
}
return fCoordChangeMatrix == other.fCoordChangeMatrix;
}
bool operator !=(const GrEffectStage& s) const { return !(*this == s); }
GrEffectStage& operator =(const GrEffectStage& other) {
GrSafeAssign(fEffectRef, other.fEffectRef);
if (NULL != fEffectRef) {
fCoordChangeMatrix = other.fCoordChangeMatrix;
}
return *this;
}
/**
* This is called when the coordinate system in which the geometry is specified will change.
*
* @param matrix The transformation from the old coord system to the new one.
*/
void preConcatCoordChange(const SkMatrix& matrix) { fCoordChangeMatrix.preConcat(matrix); }
class SavedCoordChange {
private:
SkMatrix fCoordChangeMatrix;
GR_DEBUGCODE(mutable SkAutoTUnref<const GrEffectRef> fEffectRef;)
friend class GrEffectStage;
};
/**
* This gets the current coordinate system change. It is the accumulation of
* preConcatCoordChange 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->fCoordChangeMatrix = fCoordChangeMatrix;
GrAssert(NULL == savedCoordChange->fEffectRef.get());
GR_DEBUGCODE(GrSafeRef(fEffectRef);)
GR_DEBUGCODE(savedCoordChange->fEffectRef.reset(fEffectRef);)
GR_DEBUGCODE(++fSavedCoordChangeCnt);
}
/**
* This balances the saveCoordChange call.
*/
void restoreCoordChange(const SavedCoordChange& savedCoordChange) {
fCoordChangeMatrix = savedCoordChange.fCoordChangeMatrix;
GrAssert(savedCoordChange.fEffectRef.get() == fEffectRef);
GR_DEBUGCODE(--fSavedCoordChangeCnt);
GR_DEBUGCODE(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 { return fCoordChangeMatrix; }
void reset() {
GrSafeSetNull(fEffectRef);
}
const GrEffectRef* setEffect(const GrEffectRef* EffectRef) {
GrAssert(0 == fSavedCoordChangeCnt);
GrSafeAssign(fEffectRef, EffectRef);
fCoordChangeMatrix.reset();
return EffectRef;
}
const GrEffectRef* getEffect() const { return fEffectRef; }
private:
SkMatrix fCoordChangeMatrix;
const GrEffectRef* fEffectRef;
GR_DEBUGCODE(mutable int fSavedCoordChangeCnt;)
};
#endif
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