src/third_party/skia/src/gpu/GrDrawState.cpp - cobalt - Git at Google

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */

 #include "GrDrawState.h"

 #include "GrOptDrawState.h"
 #include "GrPaint.h"

 //////////////////////////////////////////////////////////////////////////////s

 GrOptDrawState* GrDrawState::createOptState(const GrDrawTargetCaps& caps) const {
     if (NULL == fCachedOptState || caps.getUniqueID() != fCachedCapsID) {
         GrBlendCoeff srcCoeff;
         GrBlendCoeff dstCoeff;
         BlendOptFlags blendFlags = this->getBlendOpts(false, &srcCoeff, &dstCoeff);
         fCachedOptState = SkNEW_ARGS(GrOptDrawState, (*this, blendFlags, srcCoeff, dstCoeff, caps));
         fCachedCapsID = caps.getUniqueID();
     } else {
 #ifdef SK_DEBUG
         GrBlendCoeff srcCoeff;
         GrBlendCoeff dstCoeff;
         BlendOptFlags blendFlags = this->getBlendOpts(false, &srcCoeff, &dstCoeff);
         SkASSERT(GrOptDrawState(*this, blendFlags, srcCoeff, dstCoeff, caps) == *fCachedOptState);
 #endif
     }
     fCachedOptState->ref();
     return fCachedOptState;
 }

 //////////////////////////////////////////////////////////////////////////////s

 GrDrawState::CombinedState GrDrawState::CombineIfPossible(
     const GrDrawState& a, const GrDrawState& b, const GrDrawTargetCaps& caps) {

     if (!a.isEqual(b)) {
         return kIncompatible_CombinedState;
     }

     // If the general draw states are equal (from check above) we know hasColorVertexAttribute()
     // is equivalent for both a and b
     if (a.hasColorVertexAttribute()) {
         // If one is opaque and the other is not then the combined state is not opaque. Moreover,
         // if the opaqueness affects the ability to get color/coverage blending correct then we
         // don't combine the draw states.
         bool aIsOpaque = (kVertexColorsAreOpaque_Hint & a.fHints);
         bool bIsOpaque = (kVertexColorsAreOpaque_Hint & b.fHints);
         if (aIsOpaque != bIsOpaque) {
             const GrDrawState* opaque;
             const GrDrawState* nonOpaque;
             if (aIsOpaque) {
                 opaque = &a;
                 nonOpaque = &b;
             } else {
                 opaque = &b;
                 nonOpaque = &a;
             }
             if (!opaque->hasSolidCoverage() && opaque->couldApplyCoverage(caps)) {
                 SkASSERT(!nonOpaque->hasSolidCoverage());
                 if (!nonOpaque->couldApplyCoverage(caps)) {
                     return kIncompatible_CombinedState;
                 }
             }
             return aIsOpaque ? kB_CombinedState : kA_CombinedState;
         }
     }
     return kAOrB_CombinedState;
 }

 //////////////////////////////////////////////////////////////////////////////s

 GrDrawState::GrDrawState(const GrDrawState& state, const SkMatrix& preConcatMatrix)
     : fCachedOptState(NULL) {
     SkDEBUGCODE(fBlockEffectRemovalCnt = 0;)
     *this = state;
     if (!preConcatMatrix.isIdentity()) {
         if (this->hasGeometryProcessor()) {
             fGeometryProcessor->localCoordChange(preConcatMatrix);
         }
         for (int i = 0; i < this->numColorStages(); ++i) {
             fColorStages[i].localCoordChange(preConcatMatrix);
         }
         for (int i = 0; i < this->numCoverageStages(); ++i) {
             fCoverageStages[i].localCoordChange(preConcatMatrix);
         }
         this->invalidateOptState();
     }
 }

 GrDrawState& GrDrawState::operator=(const GrDrawState& that) {
     SkASSERT(0 == fBlockEffectRemovalCnt || 0 == this->numTotalStages());
     SkASSERT(!that.fRenderTarget.ownsPendingIO());
     SkASSERT(!this->fRenderTarget.ownsPendingIO());
     this->setRenderTarget(that.getRenderTarget());
     fColor = that.fColor;
     fViewMatrix = that.fViewMatrix;
     fSrcBlend = that.fSrcBlend;
     fDstBlend = that.fDstBlend;
     fBlendConstant = that.fBlendConstant;
     fFlagBits = that.fFlagBits;
     fVACount = that.fVACount;
     fVAPtr = that.fVAPtr;
     fVAStride = that.fVAStride;
     fStencilSettings = that.fStencilSettings;
     fCoverage = that.fCoverage;
     fDrawFace = that.fDrawFace;
     if (that.hasGeometryProcessor()) {
         fGeometryProcessor.reset(SkNEW_ARGS(GrGeometryStage, (*that.fGeometryProcessor.get())));
     } else {
         fGeometryProcessor.reset(NULL);
     }
     fColorStages = that.fColorStages;
     fCoverageStages = that.fCoverageStages;

     fHints = that.fHints;

     SkRefCnt_SafeAssign(fCachedOptState, that.fCachedOptState);

     memcpy(fFixedFunctionVertexAttribIndices,
             that.fFixedFunctionVertexAttribIndices,
             sizeof(fFixedFunctionVertexAttribIndices));
     return *this;
 }

 void GrDrawState::onReset(const SkMatrix* initialViewMatrix) {
     SkASSERT(0 == fBlockEffectRemovalCnt || 0 == this->numTotalStages());
     SkASSERT(!fRenderTarget.ownsPendingIO());

     fGeometryProcessor.reset(NULL);
     fColorStages.reset();
     fCoverageStages.reset();

     fRenderTarget.reset();

     this->setDefaultVertexAttribs();

     fColor = 0xffffffff;
     if (NULL == initialViewMatrix) {
         fViewMatrix.reset();
     } else {
         fViewMatrix = *initialViewMatrix;
     }
     fSrcBlend = kOne_GrBlendCoeff;
     fDstBlend = kZero_GrBlendCoeff;
     fBlendConstant = 0x0;
     fFlagBits = 0x0;
     fStencilSettings.setDisabled();
     fCoverage = 0xff;
     fDrawFace = kBoth_DrawFace;

     fHints = 0;

     this->invalidateOptState();
 }

 bool GrDrawState::setIdentityViewMatrix()  {
     if (this->numTotalStages()) {
         SkMatrix invVM;
         if (!fViewMatrix.invert(&invVM)) {
             // sad trombone sound
             return false;
         }
         if (this->hasGeometryProcessor()) {
             fGeometryProcessor->localCoordChange(invVM);
         }
         for (int s = 0; s < this->numColorStages(); ++s) {
             fColorStages[s].localCoordChange(invVM);
         }
         for (int s = 0; s < this->numCoverageStages(); ++s) {
             fCoverageStages[s].localCoordChange(invVM);
         }
     }
     this->invalidateOptState();
     fViewMatrix.reset();
     return true;
 }

 void GrDrawState::setFromPaint(const GrPaint& paint, const SkMatrix& vm, GrRenderTarget* rt) {
     SkASSERT(0 == fBlockEffectRemovalCnt || 0 == this->numTotalStages());

     fGeometryProcessor.reset(NULL);
     fColorStages.reset();
     fCoverageStages.reset();

     for (int i = 0; i < paint.numColorStages(); ++i) {
         fColorStages.push_back(paint.getColorStage(i));
     }

     for (int i = 0; i < paint.numCoverageStages(); ++i) {
         fCoverageStages.push_back(paint.getCoverageStage(i));
     }

     this->setRenderTarget(rt);

     fViewMatrix = vm;

     // These have no equivalent in GrPaint, set them to defaults
     fBlendConstant = 0x0;
     fDrawFace = kBoth_DrawFace;
     fStencilSettings.setDisabled();
     this->resetStateFlags();
     fHints = 0;

     // Enable the clip bit
     this->enableState(GrDrawState::kClip_StateBit);

     this->setColor(paint.getColor());
     this->setState(GrDrawState::kDither_StateBit, paint.isDither());
     this->setState(GrDrawState::kHWAntialias_StateBit, paint.isAntiAlias());

     this->setBlendFunc(paint.getSrcBlendCoeff(), paint.getDstBlendCoeff());
     this->setCoverage(paint.getCoverage());
     this->invalidateOptState();
 }

 ////////////////////////////////////////////////////////////////////////////////

 static void validate_vertex_attribs(const GrVertexAttrib* attribs, int count, size_t stride) {
     // this works as long as we're 4 byte-aligned
 #ifdef SK_DEBUG
     uint32_t overlapCheck = 0;
     SkASSERT(count <= GrRODrawState::kMaxVertexAttribCnt);
     for (int index = 0; index < count; ++index) {
         size_t attribSize = GrVertexAttribTypeSize(attribs[index].fType);
         size_t attribOffset = attribs[index].fOffset;
         SkASSERT(attribOffset + attribSize <= stride);
         size_t dwordCount = attribSize >> 2;
         uint32_t mask = (1 << dwordCount)-1;
         size_t offsetShift = attribOffset >> 2;
         SkASSERT(!(overlapCheck & (mask << offsetShift)));
         overlapCheck |= (mask << offsetShift);
     }
 #endif
 }

 ////////////////////////////////////////////////////////////////////////////////

 void GrDrawState::internalSetVertexAttribs(const GrVertexAttrib* attribs, int count,
                                            size_t stride) {
     SkASSERT(count <= kMaxVertexAttribCnt);

     fVAPtr = attribs;
     fVACount = count;
     fVAStride = stride;
     validate_vertex_attribs(fVAPtr, fVACount, fVAStride);

     // Set all the indices to -1
     memset(fFixedFunctionVertexAttribIndices,
            0xff,
            sizeof(fFixedFunctionVertexAttribIndices));
 #ifdef SK_DEBUG
     uint32_t overlapCheck = 0;
 #endif
     for (int i = 0; i < count; ++i) {
         if (attribs[i].fBinding < kGrFixedFunctionVertexAttribBindingCnt) {
             // The fixed function attribs can only be specified once
             SkASSERT(-1 == fFixedFunctionVertexAttribIndices[attribs[i].fBinding]);
             SkASSERT(GrFixedFunctionVertexAttribVectorCount(attribs[i].fBinding) ==
                      GrVertexAttribTypeVectorCount(attribs[i].fType));
             fFixedFunctionVertexAttribIndices[attribs[i].fBinding] = i;
         }
 #ifdef SK_DEBUG
         size_t dwordCount = GrVertexAttribTypeSize(attribs[i].fType) >> 2;
         uint32_t mask = (1 << dwordCount)-1;
         size_t offsetShift = attribs[i].fOffset >> 2;
         SkASSERT(!(overlapCheck & (mask << offsetShift)));
         overlapCheck |= (mask << offsetShift);
 #endif
     }
     this->invalidateOptState();
     // Positions must be specified.
     SkASSERT(-1 != fFixedFunctionVertexAttribIndices[kPosition_GrVertexAttribBinding]);
 }

 ////////////////////////////////////////////////////////////////////////////////

 void GrDrawState::setDefaultVertexAttribs() {
     static const GrVertexAttrib kPositionAttrib =
         {kVec2f_GrVertexAttribType, 0, kPosition_GrVertexAttribBinding};

     fVAPtr = &kPositionAttrib;
     fVACount = 1;
     fVAStride = GrVertexAttribTypeSize(kVec2f_GrVertexAttribType);

     // set all the fixed function indices to -1 except position.
     memset(fFixedFunctionVertexAttribIndices,
            0xff,
            sizeof(fFixedFunctionVertexAttribIndices));
     fFixedFunctionVertexAttribIndices[kPosition_GrVertexAttribBinding] = 0;
     this->invalidateOptState();
 }

 ////////////////////////////////////////////////////////////////////////////////

 bool GrDrawState::couldApplyCoverage(const GrDrawTargetCaps& caps) const {
     if (caps.dualSourceBlendingSupport()) {
         return true;
     }
     // we can correctly apply coverage if a) we have dual source blending
     // or b) one of our blend optimizations applies
     // or c) the src, dst blend coeffs are 1,0 and we will read Dst Color
     GrBlendCoeff srcCoeff;
     GrBlendCoeff dstCoeff;
     BlendOptFlags flag = this->getBlendOpts(true, &srcCoeff, &dstCoeff);
     return GrRODrawState::kNone_BlendOpt != flag ||
            (this->willEffectReadDstColor() &&
             kOne_GrBlendCoeff == srcCoeff && kZero_GrBlendCoeff == dstCoeff);
 }

 //////////////////////////////////////////////////////////////////////////////

 GrDrawState::AutoVertexAttribRestore::AutoVertexAttribRestore(GrDrawState* drawState) {
     SkASSERT(drawState);
     fDrawState = drawState;
     fVAPtr = drawState->fVAPtr;
     fVACount = drawState->fVACount;
     fVAStride = drawState->fVAStride;
     fDrawState->setDefaultVertexAttribs();
 }

 //////////////////////////////////////////////////////////////////////////////s

 void GrDrawState::AutoRestoreEffects::set(GrDrawState* ds) {
     if (fDrawState) {
         // See the big comment on the class definition about GPs.
         if (SK_InvalidUniqueID == fOriginalGPID) {
             fDrawState->fGeometryProcessor.reset(NULL);
         } else {
             SkASSERT(fDrawState->getGeometryProcessor()->getProcessor()->getUniqueID() ==
                      fOriginalGPID);
             fOriginalGPID = SK_InvalidUniqueID;
         }

         int m = fDrawState->numColorStages() - fColorEffectCnt;
         SkASSERT(m >= 0);
         fDrawState->fColorStages.pop_back_n(m);

         int n = fDrawState->numCoverageStages() - fCoverageEffectCnt;
         SkASSERT(n >= 0);
         fDrawState->fCoverageStages.pop_back_n(n);
         if (m + n > 0) {
             fDrawState->invalidateOptState();
         }
         SkDEBUGCODE(--fDrawState->fBlockEffectRemovalCnt;)
     }
     fDrawState = ds;
     if (NULL != ds) {
         SkASSERT(SK_InvalidUniqueID == fOriginalGPID);
         if (NULL != ds->getGeometryProcessor()) {
             fOriginalGPID = ds->getGeometryProcessor()->getProcessor()->getUniqueID();
         }
         fColorEffectCnt = ds->numColorStages();
         fCoverageEffectCnt = ds->numCoverageStages();
         SkDEBUGCODE(++ds->fBlockEffectRemovalCnt;)
     }
 }

 ////////////////////////////////////////////////////////////////////////////////

 void GrDrawState::AutoViewMatrixRestore::restore() {
     if (fDrawState) {
         SkDEBUGCODE(--fDrawState->fBlockEffectRemovalCnt;)
         fDrawState->fViewMatrix = fViewMatrix;
         SkASSERT(fDrawState->numColorStages() >= fNumColorStages);
         int numCoverageStages = fSavedCoordChanges.count() - fNumColorStages;
         SkASSERT(fDrawState->numCoverageStages() >= numCoverageStages);

         int i = 0;
         if (fHasGeometryProcessor) {
             SkASSERT(fDrawState->hasGeometryProcessor());
             fDrawState->fGeometryProcessor->restoreCoordChange(fSavedCoordChanges[i++]);
         }
         for (int s = 0; s < fNumColorStages; ++s, ++i) {
             fDrawState->fColorStages[s].restoreCoordChange(fSavedCoordChanges[i]);
         }
         for (int s = 0; s < numCoverageStages; ++s, ++i) {
             fDrawState->fCoverageStages[s].restoreCoordChange(fSavedCoordChanges[i]);
         }
         fDrawState->invalidateOptState();
         fDrawState = NULL;
     }
 }

 void GrDrawState::AutoViewMatrixRestore::set(GrDrawState* drawState,
                                              const SkMatrix& preconcatMatrix) {
     this->restore();

     SkASSERT(NULL == fDrawState);
     if (NULL == drawState || preconcatMatrix.isIdentity()) {
         return;
     }
     fDrawState = drawState;

     fViewMatrix = drawState->getViewMatrix();
     drawState->fViewMatrix.preConcat(preconcatMatrix);

     this->doEffectCoordChanges(preconcatMatrix);
     SkDEBUGCODE(++fDrawState->fBlockEffectRemovalCnt;)
     drawState->invalidateOptState();
 }

 bool GrDrawState::AutoViewMatrixRestore::setIdentity(GrDrawState* drawState) {
     this->restore();

     if (NULL == drawState) {
         return false;
     }

     if (drawState->getViewMatrix().isIdentity()) {
         return true;
     }

     drawState->invalidateOptState();
     fViewMatrix = drawState->getViewMatrix();
     if (0 == drawState->numTotalStages()) {
         drawState->fViewMatrix.reset();
         fDrawState = drawState;
         fHasGeometryProcessor = false;
         fNumColorStages = 0;
         fSavedCoordChanges.reset(0);
         SkDEBUGCODE(++fDrawState->fBlockEffectRemovalCnt;)
         return true;
     } else {
         SkMatrix inv;
         if (!fViewMatrix.invert(&inv)) {
             return false;
         }
         drawState->fViewMatrix.reset();
         fDrawState = drawState;
         this->doEffectCoordChanges(inv);
         SkDEBUGCODE(++fDrawState->fBlockEffectRemovalCnt;)
         return true;
     }
 }

 void GrDrawState::AutoViewMatrixRestore::doEffectCoordChanges(const SkMatrix& coordChangeMatrix) {
     fSavedCoordChanges.reset(fDrawState->numTotalStages());
     int i = 0;

     fHasGeometryProcessor = false;
     if (fDrawState->hasGeometryProcessor()) {
         fDrawState->fGeometryProcessor->saveCoordChange(&fSavedCoordChanges[i++]);
         fDrawState->fGeometryProcessor->localCoordChange(coordChangeMatrix);
         fHasGeometryProcessor = true;
     }

     fNumColorStages = fDrawState->numColorStages();
     for (int s = 0; s < fNumColorStages; ++s, ++i) {
         fDrawState->getColorStage(s).saveCoordChange(&fSavedCoordChanges[i]);
         fDrawState->fColorStages[s].localCoordChange(coordChangeMatrix);
     }

     int numCoverageStages = fDrawState->numCoverageStages();
     for (int s = 0; s < numCoverageStages; ++s, ++i) {
         fDrawState->getCoverageStage(s).saveCoordChange(&fSavedCoordChanges[i]);
         fDrawState->fCoverageStages[s].localCoordChange(coordChangeMatrix);
     }
 }

 ////////////////////////////////////////////////////////////////////////////////

 void GrDrawState::invalidateOptState() const {
     SkSafeSetNull(fCachedOptState);
 }

 ////////////////////////////////////////////////////////////////////////////////

 GrDrawState::~GrDrawState() {
     SkSafeUnref(fCachedOptState);
     SkASSERT(0 == fBlockEffectRemovalCnt);
 }
	/*
	* Copyright 2012 Google Inc.
	*
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/

	#include "GrDrawState.h"

	#include "GrOptDrawState.h"
	#include "GrPaint.h"

	//////////////////////////////////////////////////////////////////////////////s

	GrOptDrawState* GrDrawState::createOptState(const GrDrawTargetCaps& caps) const {
	if (NULL == fCachedOptState \|\| caps.getUniqueID() != fCachedCapsID) {
	GrBlendCoeff srcCoeff;
	GrBlendCoeff dstCoeff;
	BlendOptFlags blendFlags = this->getBlendOpts(false, &srcCoeff, &dstCoeff);
	fCachedOptState = SkNEW_ARGS(GrOptDrawState, (*this, blendFlags, srcCoeff, dstCoeff, caps));
	fCachedCapsID = caps.getUniqueID();
	} else {
	#ifdef SK_DEBUG
	GrBlendCoeff srcCoeff;
	GrBlendCoeff dstCoeff;
	BlendOptFlags blendFlags = this->getBlendOpts(false, &srcCoeff, &dstCoeff);
	SkASSERT(GrOptDrawState(this, blendFlags, srcCoeff, dstCoeff, caps) == fCachedOptState);
	#endif
	}
	fCachedOptState->ref();
	return fCachedOptState;
	}

	//////////////////////////////////////////////////////////////////////////////s

	GrDrawState::CombinedState GrDrawState::CombineIfPossible(
	const GrDrawState& a, const GrDrawState& b, const GrDrawTargetCaps& caps) {

	if (!a.isEqual(b)) {
	return kIncompatible_CombinedState;
	}

	// If the general draw states are equal (from check above) we know hasColorVertexAttribute()
	// is equivalent for both a and b
	if (a.hasColorVertexAttribute()) {
	// If one is opaque and the other is not then the combined state is not opaque. Moreover,
	// if the opaqueness affects the ability to get color/coverage blending correct then we
	// don't combine the draw states.
	bool aIsOpaque = (kVertexColorsAreOpaque_Hint & a.fHints);
	bool bIsOpaque = (kVertexColorsAreOpaque_Hint & b.fHints);
	if (aIsOpaque != bIsOpaque) {
	const GrDrawState* opaque;
	const GrDrawState* nonOpaque;
	if (aIsOpaque) {
	opaque = &a;
	nonOpaque = &b;
	} else {
	opaque = &b;
	nonOpaque = &a;
	}
	if (!opaque->hasSolidCoverage() && opaque->couldApplyCoverage(caps)) {
	SkASSERT(!nonOpaque->hasSolidCoverage());
	if (!nonOpaque->couldApplyCoverage(caps)) {
	return kIncompatible_CombinedState;
	}
	}
	return aIsOpaque ? kB_CombinedState : kA_CombinedState;
	}
	}
	return kAOrB_CombinedState;
	}

	//////////////////////////////////////////////////////////////////////////////s

	GrDrawState::GrDrawState(const GrDrawState& state, const SkMatrix& preConcatMatrix)
	: fCachedOptState(NULL) {
	SkDEBUGCODE(fBlockEffectRemovalCnt = 0;)
	*this = state;
	if (!preConcatMatrix.isIdentity()) {
	if (this->hasGeometryProcessor()) {
	fGeometryProcessor->localCoordChange(preConcatMatrix);
	}
	for (int i = 0; i < this->numColorStages(); ++i) {
	fColorStages[i].localCoordChange(preConcatMatrix);
	}
	for (int i = 0; i < this->numCoverageStages(); ++i) {
	fCoverageStages[i].localCoordChange(preConcatMatrix);
	}
	this->invalidateOptState();
	}
	}

	GrDrawState& GrDrawState::operator=(const GrDrawState& that) {
	SkASSERT(0 == fBlockEffectRemovalCnt \|\| 0 == this->numTotalStages());
	SkASSERT(!that.fRenderTarget.ownsPendingIO());
	SkASSERT(!this->fRenderTarget.ownsPendingIO());
	this->setRenderTarget(that.getRenderTarget());
	fColor = that.fColor;
	fViewMatrix = that.fViewMatrix;
	fSrcBlend = that.fSrcBlend;
	fDstBlend = that.fDstBlend;
	fBlendConstant = that.fBlendConstant;
	fFlagBits = that.fFlagBits;
	fVACount = that.fVACount;
	fVAPtr = that.fVAPtr;
	fVAStride = that.fVAStride;
	fStencilSettings = that.fStencilSettings;
	fCoverage = that.fCoverage;
	fDrawFace = that.fDrawFace;
	if (that.hasGeometryProcessor()) {
	fGeometryProcessor.reset(SkNEW_ARGS(GrGeometryStage, (*that.fGeometryProcessor.get())));
	} else {
	fGeometryProcessor.reset(NULL);
	}
	fColorStages = that.fColorStages;
	fCoverageStages = that.fCoverageStages;

	fHints = that.fHints;

	SkRefCnt_SafeAssign(fCachedOptState, that.fCachedOptState);

	memcpy(fFixedFunctionVertexAttribIndices,
	that.fFixedFunctionVertexAttribIndices,
	sizeof(fFixedFunctionVertexAttribIndices));
	return *this;
	}

	void GrDrawState::onReset(const SkMatrix* initialViewMatrix) {
	SkASSERT(0 == fBlockEffectRemovalCnt \|\| 0 == this->numTotalStages());
	SkASSERT(!fRenderTarget.ownsPendingIO());

	fGeometryProcessor.reset(NULL);
	fColorStages.reset();
	fCoverageStages.reset();

	fRenderTarget.reset();

	this->setDefaultVertexAttribs();

	fColor = 0xffffffff;
	if (NULL == initialViewMatrix) {
	fViewMatrix.reset();
	} else {
	fViewMatrix = *initialViewMatrix;
	}
	fSrcBlend = kOne_GrBlendCoeff;
	fDstBlend = kZero_GrBlendCoeff;
	fBlendConstant = 0x0;
	fFlagBits = 0x0;
	fStencilSettings.setDisabled();
	fCoverage = 0xff;
	fDrawFace = kBoth_DrawFace;

	fHints = 0;

	this->invalidateOptState();
	}

	bool GrDrawState::setIdentityViewMatrix() {
	if (this->numTotalStages()) {
	SkMatrix invVM;
	if (!fViewMatrix.invert(&invVM)) {
	// sad trombone sound
	return false;
	}
	if (this->hasGeometryProcessor()) {
	fGeometryProcessor->localCoordChange(invVM);
	}
	for (int s = 0; s < this->numColorStages(); ++s) {
	fColorStages[s].localCoordChange(invVM);
	}
	for (int s = 0; s < this->numCoverageStages(); ++s) {
	fCoverageStages[s].localCoordChange(invVM);
	}
	}
	this->invalidateOptState();
	fViewMatrix.reset();
	return true;
	}

	void GrDrawState::setFromPaint(const GrPaint& paint, const SkMatrix& vm, GrRenderTarget* rt) {
	SkASSERT(0 == fBlockEffectRemovalCnt \|\| 0 == this->numTotalStages());

	fGeometryProcessor.reset(NULL);
	fColorStages.reset();
	fCoverageStages.reset();

	for (int i = 0; i < paint.numColorStages(); ++i) {
	fColorStages.push_back(paint.getColorStage(i));
	}

	for (int i = 0; i < paint.numCoverageStages(); ++i) {
	fCoverageStages.push_back(paint.getCoverageStage(i));
	}

	this->setRenderTarget(rt);

	fViewMatrix = vm;

	// These have no equivalent in GrPaint, set them to defaults
	fBlendConstant = 0x0;
	fDrawFace = kBoth_DrawFace;
	fStencilSettings.setDisabled();
	this->resetStateFlags();
	fHints = 0;

	// Enable the clip bit
	this->enableState(GrDrawState::kClip_StateBit);

	this->setColor(paint.getColor());
	this->setState(GrDrawState::kDither_StateBit, paint.isDither());
	this->setState(GrDrawState::kHWAntialias_StateBit, paint.isAntiAlias());

	this->setBlendFunc(paint.getSrcBlendCoeff(), paint.getDstBlendCoeff());
	this->setCoverage(paint.getCoverage());
	this->invalidateOptState();
	}

	////////////////////////////////////////////////////////////////////////////////

	static void validate_vertex_attribs(const GrVertexAttrib* attribs, int count, size_t stride) {
	// this works as long as we're 4 byte-aligned
	#ifdef SK_DEBUG
	uint32_t overlapCheck = 0;
	SkASSERT(count <= GrRODrawState::kMaxVertexAttribCnt);
	for (int index = 0; index < count; ++index) {
	size_t attribSize = GrVertexAttribTypeSize(attribs[index].fType);
	size_t attribOffset = attribs[index].fOffset;
	SkASSERT(attribOffset + attribSize <= stride);
	size_t dwordCount = attribSize >> 2;
	uint32_t mask = (1 << dwordCount)-1;
	size_t offsetShift = attribOffset >> 2;
	SkASSERT(!(overlapCheck & (mask << offsetShift)));
	overlapCheck \|= (mask << offsetShift);
	}
	#endif
	}

	////////////////////////////////////////////////////////////////////////////////

	void GrDrawState::internalSetVertexAttribs(const GrVertexAttrib* attribs, int count,
	size_t stride) {
	SkASSERT(count <= kMaxVertexAttribCnt);

	fVAPtr = attribs;
	fVACount = count;
	fVAStride = stride;
	validate_vertex_attribs(fVAPtr, fVACount, fVAStride);

	// Set all the indices to -1
	memset(fFixedFunctionVertexAttribIndices,
	0xff,
	sizeof(fFixedFunctionVertexAttribIndices));
	#ifdef SK_DEBUG
	uint32_t overlapCheck = 0;
	#endif
	for (int i = 0; i < count; ++i) {
	if (attribs[i].fBinding < kGrFixedFunctionVertexAttribBindingCnt) {
	// The fixed function attribs can only be specified once
	SkASSERT(-1 == fFixedFunctionVertexAttribIndices[attribs[i].fBinding]);
	SkASSERT(GrFixedFunctionVertexAttribVectorCount(attribs[i].fBinding) ==
	GrVertexAttribTypeVectorCount(attribs[i].fType));
	fFixedFunctionVertexAttribIndices[attribs[i].fBinding] = i;
	}
	#ifdef SK_DEBUG
	size_t dwordCount = GrVertexAttribTypeSize(attribs[i].fType) >> 2;
	uint32_t mask = (1 << dwordCount)-1;
	size_t offsetShift = attribs[i].fOffset >> 2;
	SkASSERT(!(overlapCheck & (mask << offsetShift)));
	overlapCheck \|= (mask << offsetShift);
	#endif
	}
	this->invalidateOptState();
	// Positions must be specified.
	SkASSERT(-1 != fFixedFunctionVertexAttribIndices[kPosition_GrVertexAttribBinding]);
	}

	////////////////////////////////////////////////////////////////////////////////

	void GrDrawState::setDefaultVertexAttribs() {
	static const GrVertexAttrib kPositionAttrib =
	{kVec2f_GrVertexAttribType, 0, kPosition_GrVertexAttribBinding};

	fVAPtr = &kPositionAttrib;
	fVACount = 1;
	fVAStride = GrVertexAttribTypeSize(kVec2f_GrVertexAttribType);

	// set all the fixed function indices to -1 except position.
	memset(fFixedFunctionVertexAttribIndices,
	0xff,
	sizeof(fFixedFunctionVertexAttribIndices));
	fFixedFunctionVertexAttribIndices[kPosition_GrVertexAttribBinding] = 0;
	this->invalidateOptState();
	}

	////////////////////////////////////////////////////////////////////////////////

	bool GrDrawState::couldApplyCoverage(const GrDrawTargetCaps& caps) const {
	if (caps.dualSourceBlendingSupport()) {
	return true;
	}
	// we can correctly apply coverage if a) we have dual source blending
	// or b) one of our blend optimizations applies
	// or c) the src, dst blend coeffs are 1,0 and we will read Dst Color
	GrBlendCoeff srcCoeff;
	GrBlendCoeff dstCoeff;
	BlendOptFlags flag = this->getBlendOpts(true, &srcCoeff, &dstCoeff);
	return GrRODrawState::kNone_BlendOpt != flag \|\|
	(this->willEffectReadDstColor() &&
	kOne_GrBlendCoeff == srcCoeff && kZero_GrBlendCoeff == dstCoeff);
	}

	//////////////////////////////////////////////////////////////////////////////

	GrDrawState::AutoVertexAttribRestore::AutoVertexAttribRestore(GrDrawState* drawState) {
	SkASSERT(drawState);
	fDrawState = drawState;
	fVAPtr = drawState->fVAPtr;
	fVACount = drawState->fVACount;
	fVAStride = drawState->fVAStride;
	fDrawState->setDefaultVertexAttribs();
	}

	//////////////////////////////////////////////////////////////////////////////s

	void GrDrawState::AutoRestoreEffects::set(GrDrawState* ds) {
	if (fDrawState) {
	// See the big comment on the class definition about GPs.
	if (SK_InvalidUniqueID == fOriginalGPID) {
	fDrawState->fGeometryProcessor.reset(NULL);
	} else {
	SkASSERT(fDrawState->getGeometryProcessor()->getProcessor()->getUniqueID() ==
	fOriginalGPID);
	fOriginalGPID = SK_InvalidUniqueID;
	}

	int m = fDrawState->numColorStages() - fColorEffectCnt;
	SkASSERT(m >= 0);
	fDrawState->fColorStages.pop_back_n(m);

	int n = fDrawState->numCoverageStages() - fCoverageEffectCnt;
	SkASSERT(n >= 0);
	fDrawState->fCoverageStages.pop_back_n(n);
	if (m + n > 0) {
	fDrawState->invalidateOptState();
	}
	SkDEBUGCODE(--fDrawState->fBlockEffectRemovalCnt;)
	}
	fDrawState = ds;
	if (NULL != ds) {
	SkASSERT(SK_InvalidUniqueID == fOriginalGPID);
	if (NULL != ds->getGeometryProcessor()) {
	fOriginalGPID = ds->getGeometryProcessor()->getProcessor()->getUniqueID();
	}
	fColorEffectCnt = ds->numColorStages();
	fCoverageEffectCnt = ds->numCoverageStages();
	SkDEBUGCODE(++ds->fBlockEffectRemovalCnt;)
	}
	}

	////////////////////////////////////////////////////////////////////////////////

	void GrDrawState::AutoViewMatrixRestore::restore() {
	if (fDrawState) {
	SkDEBUGCODE(--fDrawState->fBlockEffectRemovalCnt;)
	fDrawState->fViewMatrix = fViewMatrix;
	SkASSERT(fDrawState->numColorStages() >= fNumColorStages);
	int numCoverageStages = fSavedCoordChanges.count() - fNumColorStages;
	SkASSERT(fDrawState->numCoverageStages() >= numCoverageStages);

	int i = 0;
	if (fHasGeometryProcessor) {
	SkASSERT(fDrawState->hasGeometryProcessor());
	fDrawState->fGeometryProcessor->restoreCoordChange(fSavedCoordChanges[i++]);
	}
	for (int s = 0; s < fNumColorStages; ++s, ++i) {
	fDrawState->fColorStages[s].restoreCoordChange(fSavedCoordChanges[i]);
	}
	for (int s = 0; s < numCoverageStages; ++s, ++i) {
	fDrawState->fCoverageStages[s].restoreCoordChange(fSavedCoordChanges[i]);
	}
	fDrawState->invalidateOptState();
	fDrawState = NULL;
	}
	}

	void GrDrawState::AutoViewMatrixRestore::set(GrDrawState* drawState,
	const SkMatrix& preconcatMatrix) {
	this->restore();

	SkASSERT(NULL == fDrawState);
	if (NULL == drawState \|\| preconcatMatrix.isIdentity()) {
	return;
	}
	fDrawState = drawState;

	fViewMatrix = drawState->getViewMatrix();
	drawState->fViewMatrix.preConcat(preconcatMatrix);

	this->doEffectCoordChanges(preconcatMatrix);
	SkDEBUGCODE(++fDrawState->fBlockEffectRemovalCnt;)
	drawState->invalidateOptState();
	}

	bool GrDrawState::AutoViewMatrixRestore::setIdentity(GrDrawState* drawState) {
	this->restore();

	if (NULL == drawState) {
	return false;
	}

	if (drawState->getViewMatrix().isIdentity()) {
	return true;
	}

	drawState->invalidateOptState();
	fViewMatrix = drawState->getViewMatrix();
	if (0 == drawState->numTotalStages()) {
	drawState->fViewMatrix.reset();
	fDrawState = drawState;
	fHasGeometryProcessor = false;
	fNumColorStages = 0;
	fSavedCoordChanges.reset(0);
	SkDEBUGCODE(++fDrawState->fBlockEffectRemovalCnt;)
	return true;
	} else {
	SkMatrix inv;
	if (!fViewMatrix.invert(&inv)) {
	return false;
	}
	drawState->fViewMatrix.reset();
	fDrawState = drawState;
	this->doEffectCoordChanges(inv);
	SkDEBUGCODE(++fDrawState->fBlockEffectRemovalCnt;)
	return true;
	}
	}

	void GrDrawState::AutoViewMatrixRestore::doEffectCoordChanges(const SkMatrix& coordChangeMatrix) {
	fSavedCoordChanges.reset(fDrawState->numTotalStages());
	int i = 0;

	fHasGeometryProcessor = false;
	if (fDrawState->hasGeometryProcessor()) {
	fDrawState->fGeometryProcessor->saveCoordChange(&fSavedCoordChanges[i++]);
	fDrawState->fGeometryProcessor->localCoordChange(coordChangeMatrix);
	fHasGeometryProcessor = true;
	}

	fNumColorStages = fDrawState->numColorStages();
	for (int s = 0; s < fNumColorStages; ++s, ++i) {
	fDrawState->getColorStage(s).saveCoordChange(&fSavedCoordChanges[i]);
	fDrawState->fColorStages[s].localCoordChange(coordChangeMatrix);
	}

	int numCoverageStages = fDrawState->numCoverageStages();
	for (int s = 0; s < numCoverageStages; ++s, ++i) {
	fDrawState->getCoverageStage(s).saveCoordChange(&fSavedCoordChanges[i]);
	fDrawState->fCoverageStages[s].localCoordChange(coordChangeMatrix);
	}
	}

	////////////////////////////////////////////////////////////////////////////////

	void GrDrawState::invalidateOptState() const {
	SkSafeSetNull(fCachedOptState);
	}

	////////////////////////////////////////////////////////////////////////////////

	GrDrawState::~GrDrawState() {
	SkSafeUnref(fCachedOptState);
	SkASSERT(0 == fBlockEffectRemovalCnt);
	}