src/gpu/GrDrawTarget.cpp - skia - Git at Google


 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */

 #include "GrDrawTarget.h"

 #include "GrAARectRenderer.h"
 #include "GrBatch.h"
 #include "GrCaps.h"
 #include "GrGpu.h"
 #include "GrPath.h"
 #include "GrPipeline.h"
 #include "GrMemoryPool.h"
 #include "GrRectBatch.h"
 #include "GrRenderTarget.h"
 #include "GrResourceProvider.h"
 #include "GrRenderTargetPriv.h"
 #include "GrSurfacePriv.h"
 #include "GrTexture.h"
 #include "GrVertexBuffer.h"

 #include "SkStrokeRec.h"

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

 GrDrawTarget::GrDrawTarget(GrGpu* gpu, GrResourceProvider* resourceProvider)
     : fGpu(SkRef(gpu))
     , fCaps(SkRef(gpu->caps()))
     , fResourceProvider(resourceProvider)
     , fGpuTraceMarkerCount(0)
     , fFlushing(false) {
 }

 GrDrawTarget::~GrDrawTarget() {
     fGpu->unref();
     fCaps->unref();
 }

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

 bool GrDrawTarget::setupDstReadIfNecessary(const GrPipelineBuilder& pipelineBuilder,
                                            const GrProcOptInfo& colorPOI,
                                            const GrProcOptInfo& coveragePOI,
                                            GrXferProcessor::DstTexture* dstTexture,
                                            const SkRect* drawBounds) {
     if (!pipelineBuilder.willXPNeedDstTexture(*this->caps(), colorPOI, coveragePOI)) {
         return true;
     }

     GrRenderTarget* rt = pipelineBuilder.getRenderTarget();

     if (this->caps()->textureBarrierSupport()) {
         if (GrTexture* rtTex = rt->asTexture()) {
             // The render target is a texture, so we can read from it directly in the shader. The XP
             // will be responsible to detect this situation and request a texture barrier.
             dstTexture->setTexture(rtTex);
             dstTexture->setOffset(0, 0);
             return true;
         }
     }

     SkIRect copyRect;
     pipelineBuilder.clip().getConservativeBounds(rt, &copyRect);

     if (drawBounds) {
         SkIRect drawIBounds;
         drawBounds->roundOut(&drawIBounds);
         if (!copyRect.intersect(drawIBounds)) {
 #ifdef SK_DEBUG
             GrCapsDebugf(fCaps, "Missed an early reject. "
                          "Bailing on draw from setupDstReadIfNecessary.\n");
 #endif
             return false;
         }
     } else {
 #ifdef SK_DEBUG
         //SkDebugf("No dev bounds when dst copy is made.\n");
 #endif
     }

     // MSAA consideration: When there is support for reading MSAA samples in the shader we could
     // have per-sample dst values by making the copy multisampled.
     GrSurfaceDesc desc;
     if (!this->getGpu()->initCopySurfaceDstDesc(rt, &desc)) {
         desc.fOrigin = kDefault_GrSurfaceOrigin;
         desc.fFlags = kRenderTarget_GrSurfaceFlag;
         desc.fConfig = rt->config();
     }


     desc.fWidth = copyRect.width();
     desc.fHeight = copyRect.height();

     static const uint32_t kFlags = 0;
     SkAutoTUnref<GrTexture> copy(fResourceProvider->createApproxTexture(desc, kFlags));

     if (!copy) {
         SkDebugf("Failed to create temporary copy of destination texture.\n");
         return false;
     }
     SkIPoint dstPoint = {0, 0};
     this->copySurface(copy, rt, copyRect, dstPoint);
     dstTexture->setTexture(copy);
     dstTexture->setOffset(copyRect.fLeft, copyRect.fTop);
     return true;
 }

 void GrDrawTarget::flush() {
     if (fFlushing) {
         return;
     }
     fFlushing = true;

     this->getGpu()->saveActiveTraceMarkers();

     this->onFlush();

     this->getGpu()->restoreActiveTraceMarkers();

     fFlushing = false;
     this->reset();
 }

 void GrDrawTarget::drawBatch(const GrPipelineBuilder& pipelineBuilder, GrBatch* batch) {
     // TODO some kind of checkdraw, but not at this level

     // Setup clip
     GrScissorState scissorState;
     GrPipelineBuilder::AutoRestoreFragmentProcessorState arfps;
     GrPipelineBuilder::AutoRestoreStencil ars;
     if (!this->setupClip(pipelineBuilder, &arfps, &ars, &scissorState, &batch->bounds())) {
         return;
     }

     // Batch bounds are tight, so for dev copies
     // TODO move this into setupDstReadIfNecessary when paths are in batch
     SkRect bounds = batch->bounds();
     bounds.outset(0.5f, 0.5f);

     GrDrawTarget::PipelineInfo pipelineInfo(pipelineBuilder, &scissorState, batch, &bounds,
                                             this);
     if (pipelineInfo.mustSkipDraw()) {
         return;
     }

     this->onDrawBatch(batch, pipelineInfo);
 }

 static const GrStencilSettings& winding_path_stencil_settings() {
     GR_STATIC_CONST_SAME_STENCIL_STRUCT(gSettings,
         kIncClamp_StencilOp,
         kIncClamp_StencilOp,
         kAlwaysIfInClip_StencilFunc,
         0xFFFF, 0xFFFF, 0xFFFF);
     return *GR_CONST_STENCIL_SETTINGS_PTR_FROM_STRUCT_PTR(&gSettings);
 }

 static const GrStencilSettings& even_odd_path_stencil_settings() {
     GR_STATIC_CONST_SAME_STENCIL_STRUCT(gSettings,
         kInvert_StencilOp,
         kInvert_StencilOp,
         kAlwaysIfInClip_StencilFunc,
         0xFFFF, 0xFFFF, 0xFFFF);
     return *GR_CONST_STENCIL_SETTINGS_PTR_FROM_STRUCT_PTR(&gSettings);
 }

 void GrDrawTarget::getPathStencilSettingsForFilltype(GrPathRendering::FillType fill,
                                                      const GrStencilAttachment* sb,
                                                      GrStencilSettings* outStencilSettings) {

     switch (fill) {
         default:
             SkFAIL("Unexpected path fill.");
         case GrPathRendering::kWinding_FillType:
             *outStencilSettings = winding_path_stencil_settings();
             break;
         case GrPathRendering::kEvenOdd_FillType:
             *outStencilSettings = even_odd_path_stencil_settings();
             break;
     }
     this->clipMaskManager()->adjustPathStencilParams(sb, outStencilSettings);
 }

 void GrDrawTarget::stencilPath(const GrPipelineBuilder& pipelineBuilder,
                                const GrPathProcessor* pathProc,
                                const GrPath* path,
                                GrPathRendering::FillType fill) {
     // TODO: extract portions of checkDraw that are relevant to path stenciling.
     SkASSERT(path);
     SkASSERT(this->caps()->shaderCaps()->pathRenderingSupport());

     // Setup clip
     GrScissorState scissorState;
     GrPipelineBuilder::AutoRestoreFragmentProcessorState arfps;
     GrPipelineBuilder::AutoRestoreStencil ars;
     if (!this->setupClip(pipelineBuilder, &arfps, &ars, &scissorState, NULL)) {
         return;
     }

     // set stencil settings for path
     GrStencilSettings stencilSettings;
     GrRenderTarget* rt = pipelineBuilder.getRenderTarget();
     GrStencilAttachment* sb = rt->renderTargetPriv().attachStencilAttachment();
     this->getPathStencilSettingsForFilltype(fill, sb, &stencilSettings);

     this->onStencilPath(pipelineBuilder, pathProc, path, scissorState, stencilSettings);
 }

 void GrDrawTarget::drawPath(const GrPipelineBuilder& pipelineBuilder,
                             const GrPathProcessor* pathProc,
                             const GrPath* path,
                             GrPathRendering::FillType fill) {
     // TODO: extract portions of checkDraw that are relevant to path rendering.
     SkASSERT(path);
     SkASSERT(this->caps()->shaderCaps()->pathRenderingSupport());

     SkRect devBounds = path->getBounds();
     pathProc->viewMatrix().mapRect(&devBounds);

     // Setup clip
     GrScissorState scissorState;
     GrPipelineBuilder::AutoRestoreFragmentProcessorState arfps;
     GrPipelineBuilder::AutoRestoreStencil ars;
     if (!this->setupClip(pipelineBuilder, &arfps, &ars, &scissorState, &devBounds)) {
        return;
     }

     // set stencil settings for path
     GrStencilSettings stencilSettings;
     GrRenderTarget* rt = pipelineBuilder.getRenderTarget();
     GrStencilAttachment* sb = rt->renderTargetPriv().attachStencilAttachment();
     this->getPathStencilSettingsForFilltype(fill, sb, &stencilSettings);

     GrDrawTarget::PipelineInfo pipelineInfo(pipelineBuilder, &scissorState, pathProc, &devBounds,
                                             this);
     if (pipelineInfo.mustSkipDraw()) {
         return;
     }

     this->onDrawPath(pathProc, path, stencilSettings, pipelineInfo);
 }

 void GrDrawTarget::drawPaths(const GrPipelineBuilder& pipelineBuilder,
                              const GrPathProcessor* pathProc,
                              const GrPathRange* pathRange,
                              const void* indices,
                              PathIndexType indexType,
                              const float transformValues[],
                              PathTransformType transformType,
                              int count,
                              GrPathRendering::FillType fill) {
     SkASSERT(this->caps()->shaderCaps()->pathRenderingSupport());
     SkASSERT(pathRange);
     SkASSERT(indices);
     SkASSERT(0 == reinterpret_cast<long>(indices) % GrPathRange::PathIndexSizeInBytes(indexType));
     SkASSERT(transformValues);

     // Setup clip
     GrScissorState scissorState;
     GrPipelineBuilder::AutoRestoreFragmentProcessorState arfps;
     GrPipelineBuilder::AutoRestoreStencil ars;
     if (!this->setupClip(pipelineBuilder, &arfps, &ars, &scissorState, NULL)) {
         return;
     }

     // set stencil settings for path
     GrStencilSettings stencilSettings;
     GrRenderTarget* rt = pipelineBuilder.getRenderTarget();
     GrStencilAttachment* sb = rt->renderTargetPriv().attachStencilAttachment();
     this->getPathStencilSettingsForFilltype(fill, sb, &stencilSettings);

     // Don't compute a bounding box for dst copy texture, we'll opt
     // instead for it to just copy the entire dst. Realistically this is a moot
     // point, because any context that supports NV_path_rendering will also
     // support NV_blend_equation_advanced.
     GrDrawTarget::PipelineInfo pipelineInfo(pipelineBuilder, &scissorState, pathProc, NULL, this);
     if (pipelineInfo.mustSkipDraw()) {
         return;
     }

     this->onDrawPaths(pathProc, pathRange, indices, indexType, transformValues,
                       transformType, count, stencilSettings, pipelineInfo);
 }

 void GrDrawTarget::drawBWRect(const GrPipelineBuilder& pipelineBuilder,
                               GrColor color,
                               const SkMatrix& viewMatrix,
                               const SkRect& rect,
                               const SkRect* localRect,
                               const SkMatrix* localMatrix) {
    SkAutoTUnref<GrBatch> batch(GrRectBatch::Create(color, viewMatrix, rect, localRect,
                                                    localMatrix));
    this->drawBatch(pipelineBuilder, batch);
 }

 void GrDrawTarget::drawAARect(const GrPipelineBuilder& pipelineBuilder,
                               GrColor color,
                               const SkMatrix& viewMatrix,
                               const SkRect& rect,
                               const SkRect& devRect) {
    GrAARectRenderer::FillAARect(this, pipelineBuilder, color, viewMatrix, rect, devRect);
 }

 void GrDrawTarget::clear(const SkIRect* rect,
                          GrColor color,
                          bool canIgnoreRect,
                          GrRenderTarget* renderTarget) {
     if (fCaps->useDrawInsteadOfClear()) {
         // This works around a driver bug with clear by drawing a rect instead.
         // The driver will ignore a clear if it is the only thing rendered to a
         // target before the target is read.
         SkIRect rtRect = SkIRect::MakeWH(renderTarget->width(), renderTarget->height());
         if (NULL == rect || canIgnoreRect || rect->contains(rtRect)) {
             rect = &rtRect;
             // We first issue a discard() since that may help tilers.
             this->discard(renderTarget);
         }

         GrPipelineBuilder pipelineBuilder;
         pipelineBuilder.setRenderTarget(renderTarget);

         this->drawSimpleRect(pipelineBuilder, color, SkMatrix::I(), *rect);
     } else {
         this->onClear(rect, color, canIgnoreRect, renderTarget);
     }
 }

 typedef GrTraceMarkerSet::Iter TMIter;
 void GrDrawTarget::saveActiveTraceMarkers() {
     if (this->caps()->gpuTracingSupport()) {
         SkASSERT(0 == fStoredTraceMarkers.count());
         fStoredTraceMarkers.addSet(fActiveTraceMarkers);
         for (TMIter iter = fStoredTraceMarkers.begin(); iter != fStoredTraceMarkers.end(); ++iter) {
             this->removeGpuTraceMarker(&(*iter));
         }
     }
 }

 void GrDrawTarget::restoreActiveTraceMarkers() {
     if (this->caps()->gpuTracingSupport()) {
         SkASSERT(0 == fActiveTraceMarkers.count());
         for (TMIter iter = fStoredTraceMarkers.begin(); iter != fStoredTraceMarkers.end(); ++iter) {
             this->addGpuTraceMarker(&(*iter));
         }
         for (TMIter iter = fActiveTraceMarkers.begin(); iter != fActiveTraceMarkers.end(); ++iter) {
             this->fStoredTraceMarkers.remove(*iter);
         }
     }
 }

 void GrDrawTarget::addGpuTraceMarker(const GrGpuTraceMarker* marker) {
     if (this->caps()->gpuTracingSupport()) {
         SkASSERT(fGpuTraceMarkerCount >= 0);
         this->fActiveTraceMarkers.add(*marker);
         ++fGpuTraceMarkerCount;
     }
 }

 void GrDrawTarget::removeGpuTraceMarker(const GrGpuTraceMarker* marker) {
     if (this->caps()->gpuTracingSupport()) {
         SkASSERT(fGpuTraceMarkerCount >= 1);
         this->fActiveTraceMarkers.remove(*marker);
         --fGpuTraceMarkerCount;
     }
 }

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

 namespace {
 // returns true if the read/written rect intersects the src/dst and false if not.
 bool clip_srcrect_and_dstpoint(const GrSurface* dst,
                                const GrSurface* src,
                                const SkIRect& srcRect,
                                const SkIPoint& dstPoint,
                                SkIRect* clippedSrcRect,
                                SkIPoint* clippedDstPoint) {
     *clippedSrcRect = srcRect;
     *clippedDstPoint = dstPoint;

     // clip the left edge to src and dst bounds, adjusting dstPoint if necessary
     if (clippedSrcRect->fLeft < 0) {
         clippedDstPoint->fX -= clippedSrcRect->fLeft;
         clippedSrcRect->fLeft = 0;
     }
     if (clippedDstPoint->fX < 0) {
         clippedSrcRect->fLeft -= clippedDstPoint->fX;
         clippedDstPoint->fX = 0;
     }

     // clip the top edge to src and dst bounds, adjusting dstPoint if necessary
     if (clippedSrcRect->fTop < 0) {
         clippedDstPoint->fY -= clippedSrcRect->fTop;
         clippedSrcRect->fTop = 0;
     }
     if (clippedDstPoint->fY < 0) {
         clippedSrcRect->fTop -= clippedDstPoint->fY;
         clippedDstPoint->fY = 0;
     }

     // clip the right edge to the src and dst bounds.
     if (clippedSrcRect->fRight > src->width()) {
         clippedSrcRect->fRight = src->width();
     }
     if (clippedDstPoint->fX + clippedSrcRect->width() > dst->width()) {
         clippedSrcRect->fRight = clippedSrcRect->fLeft + dst->width() - clippedDstPoint->fX;
     }

     // clip the bottom edge to the src and dst bounds.
     if (clippedSrcRect->fBottom > src->height()) {
         clippedSrcRect->fBottom = src->height();
     }
     if (clippedDstPoint->fY + clippedSrcRect->height() > dst->height()) {
         clippedSrcRect->fBottom = clippedSrcRect->fTop + dst->height() - clippedDstPoint->fY;
     }

     // The above clipping steps may have inverted the rect if it didn't intersect either the src or
     // dst bounds.
     return !clippedSrcRect->isEmpty();
 }
 }

 void GrDrawTarget::copySurface(GrSurface* dst,
                                GrSurface* src,
                                const SkIRect& srcRect,
                                const SkIPoint& dstPoint) {
     SkASSERT(dst);
     SkASSERT(src);

     SkIRect clippedSrcRect;
     SkIPoint clippedDstPoint;
     // If the rect is outside the src or dst then we've already succeeded.
     if (!clip_srcrect_and_dstpoint(dst,
                                    src,
                                    srcRect,
                                    dstPoint,
                                    &clippedSrcRect,
                                    &clippedDstPoint)) {
         return;
     }

     this->onCopySurface(dst, src, clippedSrcRect, clippedDstPoint);
 }

 const GrPipeline* GrDrawTarget::setupPipeline(const PipelineInfo& pipelineInfo,
                                               void* pipelineAddr) {
     return SkNEW_PLACEMENT_ARGS(pipelineAddr, GrPipeline, (*pipelineInfo.fPipelineBuilder,
                                                             pipelineInfo.fColorPOI,
                                                             pipelineInfo.fCoveragePOI,
                                                             *this->caps(),
                                                             *pipelineInfo.fScissor,
                                                             &pipelineInfo.fDstTexture));
 }
 ///////////////////////////////////////////////////////////////////////////////

 GrDrawTarget::PipelineInfo::PipelineInfo(const GrPipelineBuilder& pipelineBuilder,
                                          GrScissorState* scissor,
                                          const GrPrimitiveProcessor* primProc,
                                          const SkRect* devBounds,
                                          GrDrawTarget* target)
     : fPipelineBuilder(&pipelineBuilder)
     , fScissor(scissor) {
     fColorPOI = fPipelineBuilder->colorProcInfo(primProc);
     fCoveragePOI = fPipelineBuilder->coverageProcInfo(primProc);
     if (!target->setupDstReadIfNecessary(*fPipelineBuilder, fColorPOI, fCoveragePOI,
                                          &fDstTexture, devBounds)) {
         fPipelineBuilder = NULL;
     }
 }

 GrDrawTarget::PipelineInfo::PipelineInfo(const GrPipelineBuilder& pipelineBuilder,
                                          GrScissorState* scissor,
                                          const GrBatch* batch,
                                          const SkRect* devBounds,
                                          GrDrawTarget* target)
     : fPipelineBuilder(&pipelineBuilder)
     , fScissor(scissor) {
     fColorPOI = fPipelineBuilder->colorProcInfo(batch);
     fCoveragePOI = fPipelineBuilder->coverageProcInfo(batch);
     if (!target->setupDstReadIfNecessary(*fPipelineBuilder, fColorPOI, fCoveragePOI,
                                          &fDstTexture, devBounds)) {
         fPipelineBuilder = NULL;
     }
 }

 ///////////////////////////////////////////////////////////////////////////////
 GrClipTarget::GrClipTarget(GrContext* context)
     : INHERITED(context->getGpu(), context->resourceProvider())
     , fContext(context) {
     fClipMaskManager.reset(SkNEW_ARGS(GrClipMaskManager, (this)));
 }


 bool GrClipTarget::setupClip(const GrPipelineBuilder& pipelineBuilder,
                              GrPipelineBuilder::AutoRestoreFragmentProcessorState* arfps,
                              GrPipelineBuilder::AutoRestoreStencil* ars,
                              GrScissorState* scissorState,
                              const SkRect* devBounds) {
     return fClipMaskManager->setupClipping(pipelineBuilder,
                                            arfps,
                                            ars,
                                            scissorState,
                                            devBounds);
 }

 void GrClipTarget::purgeResources() {
     // The clip mask manager can rebuild all its clip masks so just
     // get rid of them all.
     fClipMaskManager->purgeResources();
 };

	/*
	* Copyright 2010 Google Inc.
	*
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/

	#include "GrDrawTarget.h"

	#include "GrAARectRenderer.h"
	#include "GrBatch.h"
	#include "GrCaps.h"
	#include "GrGpu.h"
	#include "GrPath.h"
	#include "GrPipeline.h"
	#include "GrMemoryPool.h"
	#include "GrRectBatch.h"
	#include "GrRenderTarget.h"
	#include "GrResourceProvider.h"
	#include "GrRenderTargetPriv.h"
	#include "GrSurfacePriv.h"
	#include "GrTexture.h"
	#include "GrVertexBuffer.h"

	#include "SkStrokeRec.h"

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

	GrDrawTarget::GrDrawTarget(GrGpu* gpu, GrResourceProvider* resourceProvider)
	: fGpu(SkRef(gpu))
	, fCaps(SkRef(gpu->caps()))
	, fResourceProvider(resourceProvider)
	, fGpuTraceMarkerCount(0)
	, fFlushing(false) {
	}

	GrDrawTarget::~GrDrawTarget() {
	fGpu->unref();
	fCaps->unref();
	}

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

	bool GrDrawTarget::setupDstReadIfNecessary(const GrPipelineBuilder& pipelineBuilder,
	const GrProcOptInfo& colorPOI,
	const GrProcOptInfo& coveragePOI,
	GrXferProcessor::DstTexture* dstTexture,
	const SkRect* drawBounds) {
	if (!pipelineBuilder.willXPNeedDstTexture(*this->caps(), colorPOI, coveragePOI)) {
	return true;
	}

	GrRenderTarget* rt = pipelineBuilder.getRenderTarget();

	if (this->caps()->textureBarrierSupport()) {
	if (GrTexture* rtTex = rt->asTexture()) {
	// The render target is a texture, so we can read from it directly in the shader. The XP
	// will be responsible to detect this situation and request a texture barrier.
	dstTexture->setTexture(rtTex);
	dstTexture->setOffset(0, 0);
	return true;
	}
	}

	SkIRect copyRect;
	pipelineBuilder.clip().getConservativeBounds(rt, &copyRect);

	if (drawBounds) {
	SkIRect drawIBounds;
	drawBounds->roundOut(&drawIBounds);
	if (!copyRect.intersect(drawIBounds)) {
	#ifdef SK_DEBUG
	GrCapsDebugf(fCaps, "Missed an early reject. "
	"Bailing on draw from setupDstReadIfNecessary.\n");
	#endif
	return false;
	}
	} else {
	#ifdef SK_DEBUG
	//SkDebugf("No dev bounds when dst copy is made.\n");
	#endif
	}

	// MSAA consideration: When there is support for reading MSAA samples in the shader we could
	// have per-sample dst values by making the copy multisampled.
	GrSurfaceDesc desc;
	if (!this->getGpu()->initCopySurfaceDstDesc(rt, &desc)) {
	desc.fOrigin = kDefault_GrSurfaceOrigin;
	desc.fFlags = kRenderTarget_GrSurfaceFlag;
	desc.fConfig = rt->config();
	}


	desc.fWidth = copyRect.width();
	desc.fHeight = copyRect.height();

	static const uint32_t kFlags = 0;
	SkAutoTUnref<GrTexture> copy(fResourceProvider->createApproxTexture(desc, kFlags));

	if (!copy) {
	SkDebugf("Failed to create temporary copy of destination texture.\n");
	return false;
	}
	SkIPoint dstPoint = {0, 0};
	this->copySurface(copy, rt, copyRect, dstPoint);
	dstTexture->setTexture(copy);
	dstTexture->setOffset(copyRect.fLeft, copyRect.fTop);
	return true;
	}

	void GrDrawTarget::flush() {
	if (fFlushing) {
	return;
	}
	fFlushing = true;

	this->getGpu()->saveActiveTraceMarkers();

	this->onFlush();

	this->getGpu()->restoreActiveTraceMarkers();

	fFlushing = false;
	this->reset();
	}

	void GrDrawTarget::drawBatch(const GrPipelineBuilder& pipelineBuilder, GrBatch* batch) {
	// TODO some kind of checkdraw, but not at this level

	// Setup clip
	GrScissorState scissorState;
	GrPipelineBuilder::AutoRestoreFragmentProcessorState arfps;
	GrPipelineBuilder::AutoRestoreStencil ars;
	if (!this->setupClip(pipelineBuilder, &arfps, &ars, &scissorState, &batch->bounds())) {
	return;
	}

	// Batch bounds are tight, so for dev copies
	// TODO move this into setupDstReadIfNecessary when paths are in batch
	SkRect bounds = batch->bounds();
	bounds.outset(0.5f, 0.5f);

	GrDrawTarget::PipelineInfo pipelineInfo(pipelineBuilder, &scissorState, batch, &bounds,
	this);
	if (pipelineInfo.mustSkipDraw()) {
	return;
	}

	this->onDrawBatch(batch, pipelineInfo);
	}

	static const GrStencilSettings& winding_path_stencil_settings() {
	GR_STATIC_CONST_SAME_STENCIL_STRUCT(gSettings,
	kIncClamp_StencilOp,
	kIncClamp_StencilOp,
	kAlwaysIfInClip_StencilFunc,
	0xFFFF, 0xFFFF, 0xFFFF);
	return *GR_CONST_STENCIL_SETTINGS_PTR_FROM_STRUCT_PTR(&gSettings);
	}

	static const GrStencilSettings& even_odd_path_stencil_settings() {
	GR_STATIC_CONST_SAME_STENCIL_STRUCT(gSettings,
	kInvert_StencilOp,
	kInvert_StencilOp,
	kAlwaysIfInClip_StencilFunc,
	0xFFFF, 0xFFFF, 0xFFFF);
	return *GR_CONST_STENCIL_SETTINGS_PTR_FROM_STRUCT_PTR(&gSettings);
	}

	void GrDrawTarget::getPathStencilSettingsForFilltype(GrPathRendering::FillType fill,
	const GrStencilAttachment* sb,
	GrStencilSettings* outStencilSettings) {

	switch (fill) {
	default:
	SkFAIL("Unexpected path fill.");
	case GrPathRendering::kWinding_FillType:
	*outStencilSettings = winding_path_stencil_settings();
	break;
	case GrPathRendering::kEvenOdd_FillType:
	*outStencilSettings = even_odd_path_stencil_settings();
	break;
	}
	this->clipMaskManager()->adjustPathStencilParams(sb, outStencilSettings);
	}

	void GrDrawTarget::stencilPath(const GrPipelineBuilder& pipelineBuilder,
	const GrPathProcessor* pathProc,
	const GrPath* path,
	GrPathRendering::FillType fill) {
	// TODO: extract portions of checkDraw that are relevant to path stenciling.
	SkASSERT(path);
	SkASSERT(this->caps()->shaderCaps()->pathRenderingSupport());

	// Setup clip
	GrScissorState scissorState;
	GrPipelineBuilder::AutoRestoreFragmentProcessorState arfps;
	GrPipelineBuilder::AutoRestoreStencil ars;
	if (!this->setupClip(pipelineBuilder, &arfps, &ars, &scissorState, NULL)) {
	return;
	}

	// set stencil settings for path
	GrStencilSettings stencilSettings;
	GrRenderTarget* rt = pipelineBuilder.getRenderTarget();
	GrStencilAttachment* sb = rt->renderTargetPriv().attachStencilAttachment();
	this->getPathStencilSettingsForFilltype(fill, sb, &stencilSettings);

	this->onStencilPath(pipelineBuilder, pathProc, path, scissorState, stencilSettings);
	}

	void GrDrawTarget::drawPath(const GrPipelineBuilder& pipelineBuilder,
	const GrPathProcessor* pathProc,
	const GrPath* path,
	GrPathRendering::FillType fill) {
	// TODO: extract portions of checkDraw that are relevant to path rendering.
	SkASSERT(path);
	SkASSERT(this->caps()->shaderCaps()->pathRenderingSupport());

	SkRect devBounds = path->getBounds();
	pathProc->viewMatrix().mapRect(&devBounds);

	// Setup clip
	GrScissorState scissorState;
	GrPipelineBuilder::AutoRestoreFragmentProcessorState arfps;
	GrPipelineBuilder::AutoRestoreStencil ars;
	if (!this->setupClip(pipelineBuilder, &arfps, &ars, &scissorState, &devBounds)) {
	return;
	}

	// set stencil settings for path
	GrStencilSettings stencilSettings;
	GrRenderTarget* rt = pipelineBuilder.getRenderTarget();
	GrStencilAttachment* sb = rt->renderTargetPriv().attachStencilAttachment();
	this->getPathStencilSettingsForFilltype(fill, sb, &stencilSettings);

	GrDrawTarget::PipelineInfo pipelineInfo(pipelineBuilder, &scissorState, pathProc, &devBounds,
	this);
	if (pipelineInfo.mustSkipDraw()) {
	return;
	}

	this->onDrawPath(pathProc, path, stencilSettings, pipelineInfo);
	}

	void GrDrawTarget::drawPaths(const GrPipelineBuilder& pipelineBuilder,
	const GrPathProcessor* pathProc,
	const GrPathRange* pathRange,
	const void* indices,
	PathIndexType indexType,
	const float transformValues[],
	PathTransformType transformType,
	int count,
	GrPathRendering::FillType fill) {
	SkASSERT(this->caps()->shaderCaps()->pathRenderingSupport());
	SkASSERT(pathRange);
	SkASSERT(indices);
	SkASSERT(0 == reinterpret_cast<long>(indices) % GrPathRange::PathIndexSizeInBytes(indexType));
	SkASSERT(transformValues);

	// Setup clip
	GrScissorState scissorState;
	GrPipelineBuilder::AutoRestoreFragmentProcessorState arfps;
	GrPipelineBuilder::AutoRestoreStencil ars;
	if (!this->setupClip(pipelineBuilder, &arfps, &ars, &scissorState, NULL)) {
	return;
	}

	// set stencil settings for path
	GrStencilSettings stencilSettings;
	GrRenderTarget* rt = pipelineBuilder.getRenderTarget();
	GrStencilAttachment* sb = rt->renderTargetPriv().attachStencilAttachment();
	this->getPathStencilSettingsForFilltype(fill, sb, &stencilSettings);

	// Don't compute a bounding box for dst copy texture, we'll opt
	// instead for it to just copy the entire dst. Realistically this is a moot
	// point, because any context that supports NV_path_rendering will also
	// support NV_blend_equation_advanced.
	GrDrawTarget::PipelineInfo pipelineInfo(pipelineBuilder, &scissorState, pathProc, NULL, this);
	if (pipelineInfo.mustSkipDraw()) {
	return;
	}

	this->onDrawPaths(pathProc, pathRange, indices, indexType, transformValues,
	transformType, count, stencilSettings, pipelineInfo);
	}

	void GrDrawTarget::drawBWRect(const GrPipelineBuilder& pipelineBuilder,
	GrColor color,
	const SkMatrix& viewMatrix,
	const SkRect& rect,
	const SkRect* localRect,
	const SkMatrix* localMatrix) {
	SkAutoTUnref<GrBatch> batch(GrRectBatch::Create(color, viewMatrix, rect, localRect,
	localMatrix));
	this->drawBatch(pipelineBuilder, batch);
	}

	void GrDrawTarget::drawAARect(const GrPipelineBuilder& pipelineBuilder,
	GrColor color,
	const SkMatrix& viewMatrix,
	const SkRect& rect,
	const SkRect& devRect) {
	GrAARectRenderer::FillAARect(this, pipelineBuilder, color, viewMatrix, rect, devRect);
	}

	void GrDrawTarget::clear(const SkIRect* rect,
	GrColor color,
	bool canIgnoreRect,
	GrRenderTarget* renderTarget) {
	if (fCaps->useDrawInsteadOfClear()) {
	// This works around a driver bug with clear by drawing a rect instead.
	// The driver will ignore a clear if it is the only thing rendered to a
	// target before the target is read.
	SkIRect rtRect = SkIRect::MakeWH(renderTarget->width(), renderTarget->height());
	if (NULL == rect \|\| canIgnoreRect \|\| rect->contains(rtRect)) {
	rect = &rtRect;
	// We first issue a discard() since that may help tilers.
	this->discard(renderTarget);
	}

	GrPipelineBuilder pipelineBuilder;
	pipelineBuilder.setRenderTarget(renderTarget);

	this->drawSimpleRect(pipelineBuilder, color, SkMatrix::I(), *rect);
	} else {
	this->onClear(rect, color, canIgnoreRect, renderTarget);
	}
	}

	typedef GrTraceMarkerSet::Iter TMIter;
	void GrDrawTarget::saveActiveTraceMarkers() {
	if (this->caps()->gpuTracingSupport()) {
	SkASSERT(0 == fStoredTraceMarkers.count());
	fStoredTraceMarkers.addSet(fActiveTraceMarkers);
	for (TMIter iter = fStoredTraceMarkers.begin(); iter != fStoredTraceMarkers.end(); ++iter) {
	this->removeGpuTraceMarker(&(*iter));
	}
	}
	}

	void GrDrawTarget::restoreActiveTraceMarkers() {
	if (this->caps()->gpuTracingSupport()) {
	SkASSERT(0 == fActiveTraceMarkers.count());
	for (TMIter iter = fStoredTraceMarkers.begin(); iter != fStoredTraceMarkers.end(); ++iter) {
	this->addGpuTraceMarker(&(*iter));
	}
	for (TMIter iter = fActiveTraceMarkers.begin(); iter != fActiveTraceMarkers.end(); ++iter) {
	this->fStoredTraceMarkers.remove(*iter);
	}
	}
	}

	void GrDrawTarget::addGpuTraceMarker(const GrGpuTraceMarker* marker) {
	if (this->caps()->gpuTracingSupport()) {
	SkASSERT(fGpuTraceMarkerCount >= 0);
	this->fActiveTraceMarkers.add(*marker);
	++fGpuTraceMarkerCount;
	}
	}

	void GrDrawTarget::removeGpuTraceMarker(const GrGpuTraceMarker* marker) {
	if (this->caps()->gpuTracingSupport()) {
	SkASSERT(fGpuTraceMarkerCount >= 1);
	this->fActiveTraceMarkers.remove(*marker);
	--fGpuTraceMarkerCount;
	}
	}

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

	namespace {
	// returns true if the read/written rect intersects the src/dst and false if not.
	bool clip_srcrect_and_dstpoint(const GrSurface* dst,
	const GrSurface* src,
	const SkIRect& srcRect,
	const SkIPoint& dstPoint,
	SkIRect* clippedSrcRect,
	SkIPoint* clippedDstPoint) {
	*clippedSrcRect = srcRect;
	*clippedDstPoint = dstPoint;

	// clip the left edge to src and dst bounds, adjusting dstPoint if necessary
	if (clippedSrcRect->fLeft < 0) {
	clippedDstPoint->fX -= clippedSrcRect->fLeft;
	clippedSrcRect->fLeft = 0;
	}
	if (clippedDstPoint->fX < 0) {
	clippedSrcRect->fLeft -= clippedDstPoint->fX;
	clippedDstPoint->fX = 0;
	}

	// clip the top edge to src and dst bounds, adjusting dstPoint if necessary
	if (clippedSrcRect->fTop < 0) {
	clippedDstPoint->fY -= clippedSrcRect->fTop;
	clippedSrcRect->fTop = 0;
	}
	if (clippedDstPoint->fY < 0) {
	clippedSrcRect->fTop -= clippedDstPoint->fY;
	clippedDstPoint->fY = 0;
	}

	// clip the right edge to the src and dst bounds.
	if (clippedSrcRect->fRight > src->width()) {
	clippedSrcRect->fRight = src->width();
	}
	if (clippedDstPoint->fX + clippedSrcRect->width() > dst->width()) {
	clippedSrcRect->fRight = clippedSrcRect->fLeft + dst->width() - clippedDstPoint->fX;
	}

	// clip the bottom edge to the src and dst bounds.
	if (clippedSrcRect->fBottom > src->height()) {
	clippedSrcRect->fBottom = src->height();
	}
	if (clippedDstPoint->fY + clippedSrcRect->height() > dst->height()) {
	clippedSrcRect->fBottom = clippedSrcRect->fTop + dst->height() - clippedDstPoint->fY;
	}

	// The above clipping steps may have inverted the rect if it didn't intersect either the src or
	// dst bounds.
	return !clippedSrcRect->isEmpty();
	}
	}

	void GrDrawTarget::copySurface(GrSurface* dst,
	GrSurface* src,
	const SkIRect& srcRect,
	const SkIPoint& dstPoint) {
	SkASSERT(dst);
	SkASSERT(src);

	SkIRect clippedSrcRect;
	SkIPoint clippedDstPoint;
	// If the rect is outside the src or dst then we've already succeeded.
	if (!clip_srcrect_and_dstpoint(dst,
	src,
	srcRect,
	dstPoint,
	&clippedSrcRect,
	&clippedDstPoint)) {
	return;
	}

	this->onCopySurface(dst, src, clippedSrcRect, clippedDstPoint);
	}

	const GrPipeline* GrDrawTarget::setupPipeline(const PipelineInfo& pipelineInfo,
	void* pipelineAddr) {
	return SkNEW_PLACEMENT_ARGS(pipelineAddr, GrPipeline, (*pipelineInfo.fPipelineBuilder,
	pipelineInfo.fColorPOI,
	pipelineInfo.fCoveragePOI,
	*this->caps(),
	*pipelineInfo.fScissor,
	&pipelineInfo.fDstTexture));
	}
	///////////////////////////////////////////////////////////////////////////////

	GrDrawTarget::PipelineInfo::PipelineInfo(const GrPipelineBuilder& pipelineBuilder,
	GrScissorState* scissor,
	const GrPrimitiveProcessor* primProc,
	const SkRect* devBounds,
	GrDrawTarget* target)
	: fPipelineBuilder(&pipelineBuilder)
	, fScissor(scissor) {
	fColorPOI = fPipelineBuilder->colorProcInfo(primProc);
	fCoveragePOI = fPipelineBuilder->coverageProcInfo(primProc);
	if (!target->setupDstReadIfNecessary(*fPipelineBuilder, fColorPOI, fCoveragePOI,
	&fDstTexture, devBounds)) {
	fPipelineBuilder = NULL;
	}
	}

	GrDrawTarget::PipelineInfo::PipelineInfo(const GrPipelineBuilder& pipelineBuilder,
	GrScissorState* scissor,
	const GrBatch* batch,
	const SkRect* devBounds,
	GrDrawTarget* target)
	: fPipelineBuilder(&pipelineBuilder)
	, fScissor(scissor) {
	fColorPOI = fPipelineBuilder->colorProcInfo(batch);
	fCoveragePOI = fPipelineBuilder->coverageProcInfo(batch);
	if (!target->setupDstReadIfNecessary(*fPipelineBuilder, fColorPOI, fCoveragePOI,
	&fDstTexture, devBounds)) {
	fPipelineBuilder = NULL;
	}
	}

	///////////////////////////////////////////////////////////////////////////////
	GrClipTarget::GrClipTarget(GrContext* context)
	: INHERITED(context->getGpu(), context->resourceProvider())
	, fContext(context) {
	fClipMaskManager.reset(SkNEW_ARGS(GrClipMaskManager, (this)));
	}


	bool GrClipTarget::setupClip(const GrPipelineBuilder& pipelineBuilder,
	GrPipelineBuilder::AutoRestoreFragmentProcessorState* arfps,
	GrPipelineBuilder::AutoRestoreStencil* ars,
	GrScissorState* scissorState,
	const SkRect* devBounds) {
	return fClipMaskManager->setupClipping(pipelineBuilder,
	arfps,
	ars,
	scissorState,
	devBounds);
	}

	void GrClipTarget::purgeResources() {
	// The clip mask manager can rebuild all its clip masks so just
	// get rid of them all.
	fClipMaskManager->purgeResources();
	};