| /* | |
| * 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 "GrClipMaskManager.h" | |
| #include "GrAAConvexPathRenderer.h" | |
| #include "GrAAHairLinePathRenderer.h" | |
| #include "GrCaps.h" | |
| #include "GrDrawContext.h" | |
| #include "GrDrawTarget.h" | |
| #include "GrPaint.h" | |
| #include "GrPathRenderer.h" | |
| #include "GrRenderTarget.h" | |
| #include "GrRenderTargetPriv.h" | |
| #include "GrStencilAttachment.h" | |
| #include "GrSWMaskHelper.h" | |
| #include "SkRasterClip.h" | |
| #include "SkTLazy.h" | |
| #include "effects/GrConvexPolyEffect.h" | |
| #include "effects/GrPorterDuffXferProcessor.h" | |
| #include "effects/GrRRectEffect.h" | |
| #include "effects/GrTextureDomain.h" | |
| typedef SkClipStack::Element Element; | |
| //////////////////////////////////////////////////////////////////////////////// | |
| namespace { | |
| // set up the draw state to enable the aa clipping mask. Besides setting up the | |
| // stage matrix this also alters the vertex layout | |
| void setup_drawstate_aaclip(GrPipelineBuilder* pipelineBuilder, | |
| GrTexture* result, | |
| GrPipelineBuilder::AutoRestoreFragmentProcessors* arfp, | |
| const SkIRect &devBound) { | |
| SkASSERT(pipelineBuilder && arfp); | |
| arfp->set(pipelineBuilder); | |
| SkMatrix mat; | |
| // We use device coords to compute the texture coordinates. We set our matrix to be a | |
| // translation to the devBound, and then a scaling matrix to normalized coords. | |
| mat.setIDiv(result->width(), result->height()); | |
| mat.preTranslate(SkIntToScalar(-devBound.fLeft), | |
| SkIntToScalar(-devBound.fTop)); | |
| SkIRect domainTexels = SkIRect::MakeWH(devBound.width(), devBound.height()); | |
| // This could be a long-lived effect that is cached with the alpha-mask. | |
| pipelineBuilder->addCoverageProcessor( | |
| GrTextureDomainEffect::Create(result, | |
| mat, | |
| GrTextureDomain::MakeTexelDomain(result, domainTexels), | |
| GrTextureDomain::kDecal_Mode, | |
| GrTextureParams::kNone_FilterMode, | |
| kDevice_GrCoordSet))->unref(); | |
| } | |
| bool path_needs_SW_renderer(GrContext* context, | |
| const GrDrawTarget* gpu, | |
| const GrPipelineBuilder* pipelineBuilder, | |
| const SkMatrix& viewMatrix, | |
| const SkPath& origPath, | |
| const GrStrokeInfo& stroke, | |
| bool doAA) { | |
| // the gpu alpha mask will draw the inverse paths as non-inverse to a temp buffer | |
| SkTCopyOnFirstWrite<SkPath> path(origPath); | |
| if (path->isInverseFillType()) { | |
| path.writable()->toggleInverseFillType(); | |
| } | |
| // last (false) parameter disallows use of the SW path renderer | |
| GrPathRendererChain::DrawType type = doAA ? | |
| GrPathRendererChain::kColorAntiAlias_DrawType : | |
| GrPathRendererChain::kColor_DrawType; | |
| return NULL == context->getPathRenderer(gpu, pipelineBuilder, viewMatrix, *path, stroke, | |
| false, type); | |
| } | |
| } | |
| /* | |
| * This method traverses the clip stack to see if the GrSoftwarePathRenderer | |
| * will be used on any element. If so, it returns true to indicate that the | |
| * entire clip should be rendered in SW and then uploaded en masse to the gpu. | |
| */ | |
| bool GrClipMaskManager::useSWOnlyPath(const GrPipelineBuilder* pipelineBuilder, | |
| const SkVector& clipToMaskOffset, | |
| const GrReducedClip::ElementList& elements) { | |
| // TODO: generalize this function so that when | |
| // a clip gets complex enough it can just be done in SW regardless | |
| // of whether it would invoke the GrSoftwarePathRenderer. | |
| GrStrokeInfo stroke(SkStrokeRec::kFill_InitStyle); | |
| // Set the matrix so that rendered clip elements are transformed to mask space from clip | |
| // space. | |
| SkMatrix translate; | |
| translate.setTranslate(clipToMaskOffset); | |
| for (GrReducedClip::ElementList::Iter iter(elements.headIter()); iter.get(); iter.next()) { | |
| const Element* element = iter.get(); | |
| // rects can always be drawn directly w/o using the software path | |
| // Skip rrects once we're drawing them directly. | |
| if (Element::kRect_Type != element->getType()) { | |
| SkPath path; | |
| element->asPath(&path); | |
| if (path_needs_SW_renderer(this->getContext(), fClipTarget, pipelineBuilder, translate, | |
| path, stroke, element->isAA())) { | |
| return true; | |
| } | |
| } | |
| } | |
| return false; | |
| } | |
| bool GrClipMaskManager::installClipEffects(GrPipelineBuilder* pipelineBuilder, | |
| GrPipelineBuilder::AutoRestoreFragmentProcessors* arfp, | |
| const GrReducedClip::ElementList& elements, | |
| const SkVector& clipToRTOffset, | |
| const SkRect* drawBounds) { | |
| SkRect boundsInClipSpace; | |
| if (drawBounds) { | |
| boundsInClipSpace = *drawBounds; | |
| boundsInClipSpace.offset(-clipToRTOffset.fX, -clipToRTOffset.fY); | |
| } | |
| arfp->set(pipelineBuilder); | |
| GrRenderTarget* rt = pipelineBuilder->getRenderTarget(); | |
| GrReducedClip::ElementList::Iter iter(elements); | |
| bool failed = false; | |
| while (iter.get()) { | |
| SkRegion::Op op = iter.get()->getOp(); | |
| bool invert; | |
| bool skip = false; | |
| switch (op) { | |
| case SkRegion::kReplace_Op: | |
| SkASSERT(iter.get() == elements.head()); | |
| // Fallthrough, handled same as intersect. | |
| case SkRegion::kIntersect_Op: | |
| invert = false; | |
| if (drawBounds && iter.get()->contains(boundsInClipSpace)) { | |
| skip = true; | |
| } | |
| break; | |
| case SkRegion::kDifference_Op: | |
| invert = true; | |
| // We don't currently have a cheap test for whether a rect is fully outside an | |
| // element's primitive, so don't attempt to set skip. | |
| break; | |
| default: | |
| failed = true; | |
| break; | |
| } | |
| if (failed) { | |
| break; | |
| } | |
| if (!skip) { | |
| GrPrimitiveEdgeType edgeType; | |
| if (iter.get()->isAA()) { | |
| if (rt->isMultisampled()) { | |
| // Coverage based AA clips don't place nicely with MSAA. | |
| failed = true; | |
| break; | |
| } | |
| edgeType = | |
| invert ? kInverseFillAA_GrProcessorEdgeType : kFillAA_GrProcessorEdgeType; | |
| } else { | |
| edgeType = | |
| invert ? kInverseFillBW_GrProcessorEdgeType : kFillBW_GrProcessorEdgeType; | |
| } | |
| SkAutoTUnref<GrFragmentProcessor> fp; | |
| switch (iter.get()->getType()) { | |
| case SkClipStack::Element::kPath_Type: | |
| fp.reset(GrConvexPolyEffect::Create(edgeType, iter.get()->getPath(), | |
| &clipToRTOffset)); | |
| break; | |
| case SkClipStack::Element::kRRect_Type: { | |
| SkRRect rrect = iter.get()->getRRect(); | |
| rrect.offset(clipToRTOffset.fX, clipToRTOffset.fY); | |
| fp.reset(GrRRectEffect::Create(edgeType, rrect)); | |
| break; | |
| } | |
| case SkClipStack::Element::kRect_Type: { | |
| SkRect rect = iter.get()->getRect(); | |
| rect.offset(clipToRTOffset.fX, clipToRTOffset.fY); | |
| fp.reset(GrConvexPolyEffect::Create(edgeType, rect)); | |
| break; | |
| } | |
| default: | |
| break; | |
| } | |
| if (fp) { | |
| pipelineBuilder->addCoverageProcessor(fp); | |
| } else { | |
| failed = true; | |
| break; | |
| } | |
| } | |
| iter.next(); | |
| } | |
| if (failed) { | |
| arfp->set(NULL); | |
| } | |
| return !failed; | |
| } | |
| //////////////////////////////////////////////////////////////////////////////// | |
| // sort out what kind of clip mask needs to be created: alpha, stencil, | |
| // scissor, or entirely software | |
| bool GrClipMaskManager::setupClipping(GrPipelineBuilder* pipelineBuilder, | |
| GrPipelineBuilder::AutoRestoreFragmentProcessors* arfp, | |
| GrPipelineBuilder::AutoRestoreStencil* ars, | |
| GrScissorState* scissorState, | |
| const SkRect* devBounds) { | |
| fCurrClipMaskType = kNone_ClipMaskType; | |
| if (kRespectClip_StencilClipMode == fClipMode) { | |
| fClipMode = kIgnoreClip_StencilClipMode; | |
| } | |
| GrReducedClip::ElementList elements(16); | |
| int32_t genID = 0; | |
| GrReducedClip::InitialState initialState = GrReducedClip::kAllIn_InitialState; | |
| SkIRect clipSpaceIBounds; | |
| bool requiresAA = false; | |
| GrRenderTarget* rt = pipelineBuilder->getRenderTarget(); | |
| // GrDrawTarget should have filtered this for us | |
| SkASSERT(rt); | |
| SkIRect clipSpaceRTIBounds = SkIRect::MakeWH(rt->width(), rt->height()); | |
| const GrClip& clip = pipelineBuilder->clip(); | |
| if (clip.isWideOpen(clipSpaceRTIBounds)) { | |
| this->setPipelineBuilderStencil(pipelineBuilder, ars); | |
| return true; | |
| } | |
| // The clip mask manager always draws with a single IRect so we special case that logic here | |
| // Image filters just use a rect, so we also special case that logic | |
| switch (clip.clipType()) { | |
| case GrClip::kWideOpen_ClipType: | |
| SkFAIL("Should have caught this with clip.isWideOpen()"); | |
| return true; | |
| case GrClip::kIRect_ClipType: { | |
| SkIRect scissor = clip.irect(); | |
| if (scissor.intersect(clipSpaceRTIBounds)) { | |
| scissorState->set(scissor); | |
| this->setPipelineBuilderStencil(pipelineBuilder, ars); | |
| return true; | |
| } | |
| return false; | |
| } | |
| case GrClip::kClipStack_ClipType: { | |
| clipSpaceRTIBounds.offset(clip.origin()); | |
| GrReducedClip::ReduceClipStack(*clip.clipStack(), | |
| clipSpaceRTIBounds, | |
| &elements, | |
| &genID, | |
| &initialState, | |
| &clipSpaceIBounds, | |
| &requiresAA); | |
| if (elements.isEmpty()) { | |
| if (GrReducedClip::kAllIn_InitialState == initialState) { | |
| if (clipSpaceIBounds == clipSpaceRTIBounds) { | |
| this->setPipelineBuilderStencil(pipelineBuilder, ars); | |
| return true; | |
| } | |
| } else { | |
| return false; | |
| } | |
| } | |
| } break; | |
| } | |
| // An element count of 4 was chosen because of the common pattern in Blink of: | |
| // isect RR | |
| // diff RR | |
| // isect convex_poly | |
| // isect convex_poly | |
| // when drawing rounded div borders. This could probably be tuned based on a | |
| // configuration's relative costs of switching RTs to generate a mask vs | |
| // longer shaders. | |
| if (elements.count() <= 4) { | |
| SkVector clipToRTOffset = { SkIntToScalar(-clip.origin().fX), | |
| SkIntToScalar(-clip.origin().fY) }; | |
| if (elements.isEmpty() || | |
| (requiresAA && this->installClipEffects(pipelineBuilder, arfp, elements, clipToRTOffset, | |
| devBounds))) { | |
| SkIRect scissorSpaceIBounds(clipSpaceIBounds); | |
| scissorSpaceIBounds.offset(-clip.origin()); | |
| if (NULL == devBounds || | |
| !SkRect::Make(scissorSpaceIBounds).contains(*devBounds)) { | |
| scissorState->set(scissorSpaceIBounds); | |
| } | |
| this->setPipelineBuilderStencil(pipelineBuilder, ars); | |
| return true; | |
| } | |
| } | |
| // If MSAA is enabled we can do everything in the stencil buffer. | |
| if (0 == rt->numSamples() && requiresAA) { | |
| GrTexture* result = NULL; | |
| // The top-left of the mask corresponds to the top-left corner of the bounds. | |
| SkVector clipToMaskOffset = { | |
| SkIntToScalar(-clipSpaceIBounds.fLeft), | |
| SkIntToScalar(-clipSpaceIBounds.fTop) | |
| }; | |
| if (this->useSWOnlyPath(pipelineBuilder, clipToMaskOffset, elements)) { | |
| // The clip geometry is complex enough that it will be more efficient to create it | |
| // entirely in software | |
| result = this->createSoftwareClipMask(genID, | |
| initialState, | |
| elements, | |
| clipToMaskOffset, | |
| clipSpaceIBounds); | |
| } else { | |
| result = this->createAlphaClipMask(genID, | |
| initialState, | |
| elements, | |
| clipToMaskOffset, | |
| clipSpaceIBounds); | |
| } | |
| if (result) { | |
| arfp->set(pipelineBuilder); | |
| // The mask's top left coord should be pinned to the rounded-out top left corner of | |
| // clipSpace bounds. We determine the mask's position WRT to the render target here. | |
| SkIRect rtSpaceMaskBounds = clipSpaceIBounds; | |
| rtSpaceMaskBounds.offset(-clip.origin()); | |
| setup_drawstate_aaclip(pipelineBuilder, result, arfp, rtSpaceMaskBounds); | |
| this->setPipelineBuilderStencil(pipelineBuilder, ars); | |
| return true; | |
| } | |
| // if alpha clip mask creation fails fall through to the non-AA code paths | |
| } | |
| // Either a hard (stencil buffer) clip was explicitly requested or an anti-aliased clip couldn't | |
| // be created. In either case, free up the texture in the anti-aliased mask cache. | |
| // TODO: this may require more investigation. Ganesh performs a lot of utility draws (e.g., | |
| // clears, InOrderDrawBuffer playbacks) that hit the stencil buffer path. These may be | |
| // "incorrectly" clearing the AA cache. | |
| fAACache.reset(); | |
| // use the stencil clip if we can't represent the clip as a rectangle. | |
| SkIPoint clipSpaceToStencilSpaceOffset = -clip.origin(); | |
| this->createStencilClipMask(rt, | |
| genID, | |
| initialState, | |
| elements, | |
| clipSpaceIBounds, | |
| clipSpaceToStencilSpaceOffset); | |
| // This must occur after createStencilClipMask. That function may change the scissor. Also, it | |
| // only guarantees that the stencil mask is correct within the bounds it was passed, so we must | |
| // use both stencil and scissor test to the bounds for the final draw. | |
| SkIRect scissorSpaceIBounds(clipSpaceIBounds); | |
| scissorSpaceIBounds.offset(clipSpaceToStencilSpaceOffset); | |
| scissorState->set(scissorSpaceIBounds); | |
| this->setPipelineBuilderStencil(pipelineBuilder, ars); | |
| return true; | |
| } | |
| namespace { | |
| //////////////////////////////////////////////////////////////////////////////// | |
| // Set a coverage drawing XPF on the pipelineBuilder for the given op and invertCoverage mode | |
| void set_coverage_drawing_xpf(SkRegion::Op op, bool invertCoverage, | |
| GrPipelineBuilder* pipelineBuilder) { | |
| SkASSERT(op <= SkRegion::kLastOp); | |
| pipelineBuilder->setCoverageSetOpXPFactory(op, invertCoverage); | |
| } | |
| } | |
| //////////////////////////////////////////////////////////////////////////////// | |
| bool GrClipMaskManager::drawElement(GrPipelineBuilder* pipelineBuilder, | |
| const SkMatrix& viewMatrix, | |
| GrTexture* target, | |
| const SkClipStack::Element* element, | |
| GrPathRenderer* pr) { | |
| pipelineBuilder->setRenderTarget(target->asRenderTarget()); | |
| // The color we use to draw does not matter since we will always be using a GrCoverageSetOpXP | |
| // which ignores color. | |
| GrColor color = GrColor_WHITE; | |
| // TODO: Draw rrects directly here. | |
| switch (element->getType()) { | |
| case Element::kEmpty_Type: | |
| SkDEBUGFAIL("Should never get here with an empty element."); | |
| break; | |
| case Element::kRect_Type: | |
| // TODO: Do rects directly to the accumulator using a aa-rect GrProcessor that covers | |
| // the entire mask bounds and writes 0 outside the rect. | |
| if (element->isAA()) { | |
| SkRect devRect = element->getRect(); | |
| viewMatrix.mapRect(&devRect); | |
| fClipTarget->drawAARect(pipelineBuilder, color, viewMatrix, | |
| element->getRect(), devRect); | |
| } else { | |
| fClipTarget->drawSimpleRect(pipelineBuilder, color, viewMatrix, | |
| element->getRect()); | |
| } | |
| return true; | |
| default: { | |
| SkPath path; | |
| element->asPath(&path); | |
| path.setIsVolatile(true); | |
| if (path.isInverseFillType()) { | |
| path.toggleInverseFillType(); | |
| } | |
| GrStrokeInfo stroke(SkStrokeRec::kFill_InitStyle); | |
| if (NULL == pr) { | |
| GrPathRendererChain::DrawType type; | |
| type = element->isAA() ? GrPathRendererChain::kColorAntiAlias_DrawType : | |
| GrPathRendererChain::kColor_DrawType; | |
| pr = this->getContext()->getPathRenderer(fClipTarget, pipelineBuilder, viewMatrix, | |
| path, stroke, false, type); | |
| } | |
| if (NULL == pr) { | |
| return false; | |
| } | |
| pr->drawPath(fClipTarget, pipelineBuilder, color, viewMatrix, path, stroke, | |
| element->isAA()); | |
| break; | |
| } | |
| } | |
| return true; | |
| } | |
| bool GrClipMaskManager::canStencilAndDrawElement(GrPipelineBuilder* pipelineBuilder, | |
| GrTexture* target, | |
| GrPathRenderer** pr, | |
| const SkClipStack::Element* element) { | |
| pipelineBuilder->setRenderTarget(target->asRenderTarget()); | |
| if (Element::kRect_Type == element->getType()) { | |
| return true; | |
| } else { | |
| // We shouldn't get here with an empty clip element. | |
| SkASSERT(Element::kEmpty_Type != element->getType()); | |
| SkPath path; | |
| element->asPath(&path); | |
| if (path.isInverseFillType()) { | |
| path.toggleInverseFillType(); | |
| } | |
| GrStrokeInfo stroke(SkStrokeRec::kFill_InitStyle); | |
| GrPathRendererChain::DrawType type = element->isAA() ? | |
| GrPathRendererChain::kStencilAndColorAntiAlias_DrawType : | |
| GrPathRendererChain::kStencilAndColor_DrawType; | |
| *pr = this->getContext()->getPathRenderer(fClipTarget, pipelineBuilder, SkMatrix::I(), path, | |
| stroke, false, type); | |
| return SkToBool(*pr); | |
| } | |
| } | |
| void GrClipMaskManager::mergeMask(GrPipelineBuilder* pipelineBuilder, | |
| GrTexture* dstMask, | |
| GrTexture* srcMask, | |
| SkRegion::Op op, | |
| const SkIRect& dstBound, | |
| const SkIRect& srcBound) { | |
| pipelineBuilder->setRenderTarget(dstMask->asRenderTarget()); | |
| // We want to invert the coverage here | |
| set_coverage_drawing_xpf(op, false, pipelineBuilder); | |
| SkMatrix sampleM; | |
| sampleM.setIDiv(srcMask->width(), srcMask->height()); | |
| pipelineBuilder->addCoverageProcessor( | |
| GrTextureDomainEffect::Create(srcMask, | |
| sampleM, | |
| GrTextureDomain::MakeTexelDomain(srcMask, srcBound), | |
| GrTextureDomain::kDecal_Mode, | |
| GrTextureParams::kNone_FilterMode))->unref(); | |
| // The color passed in here does not matter since the coverageSetOpXP won't read it. | |
| fClipTarget->drawSimpleRect(pipelineBuilder, | |
| GrColor_WHITE, | |
| SkMatrix::I(), | |
| SkRect::Make(dstBound)); | |
| } | |
| GrTexture* GrClipMaskManager::createTempMask(int width, int height) { | |
| GrSurfaceDesc desc; | |
| desc.fFlags = kRenderTarget_GrSurfaceFlag; | |
| desc.fWidth = width; | |
| desc.fHeight = height; | |
| if (this->getContext()->caps()->isConfigRenderable(kAlpha_8_GrPixelConfig, false)) { | |
| desc.fConfig = kAlpha_8_GrPixelConfig; | |
| } else { | |
| desc.fConfig = kRGBA_8888_GrPixelConfig; | |
| } | |
| return this->getContext()->textureProvider()->refScratchTexture( | |
| desc, GrTextureProvider::kApprox_ScratchTexMatch); | |
| } | |
| //////////////////////////////////////////////////////////////////////////////// | |
| // Return the texture currently in the cache if it exists. Otherwise, return NULL | |
| GrTexture* GrClipMaskManager::getCachedMaskTexture(int32_t elementsGenID, | |
| const SkIRect& clipSpaceIBounds) { | |
| bool cached = fAACache.canReuse(elementsGenID, clipSpaceIBounds); | |
| if (!cached) { | |
| return NULL; | |
| } | |
| return fAACache.getLastMask(); | |
| } | |
| //////////////////////////////////////////////////////////////////////////////// | |
| // Allocate a texture in the texture cache. This function returns the texture | |
| // allocated (or NULL on error). | |
| GrTexture* GrClipMaskManager::allocMaskTexture(int32_t elementsGenID, | |
| const SkIRect& clipSpaceIBounds, | |
| bool willUpload) { | |
| // Since we are setting up the cache we should free up the | |
| // currently cached mask so it can be reused. | |
| fAACache.reset(); | |
| GrSurfaceDesc desc; | |
| desc.fFlags = willUpload ? kNone_GrSurfaceFlags : kRenderTarget_GrSurfaceFlag; | |
| desc.fWidth = clipSpaceIBounds.width(); | |
| desc.fHeight = clipSpaceIBounds.height(); | |
| desc.fConfig = kRGBA_8888_GrPixelConfig; | |
| if (willUpload || | |
| this->getContext()->caps()->isConfigRenderable(kAlpha_8_GrPixelConfig, false)) { | |
| // We would always like A8 but it isn't supported on all platforms | |
| desc.fConfig = kAlpha_8_GrPixelConfig; | |
| } | |
| fAACache.acquireMask(elementsGenID, desc, clipSpaceIBounds); | |
| return fAACache.getLastMask(); | |
| } | |
| //////////////////////////////////////////////////////////////////////////////// | |
| // Create a 8-bit clip mask in alpha | |
| GrTexture* GrClipMaskManager::createAlphaClipMask(int32_t elementsGenID, | |
| GrReducedClip::InitialState initialState, | |
| const GrReducedClip::ElementList& elements, | |
| const SkVector& clipToMaskOffset, | |
| const SkIRect& clipSpaceIBounds) { | |
| SkASSERT(kNone_ClipMaskType == fCurrClipMaskType); | |
| // First, check for cached texture | |
| GrTexture* result = this->getCachedMaskTexture(elementsGenID, clipSpaceIBounds); | |
| if (result) { | |
| fCurrClipMaskType = kAlpha_ClipMaskType; | |
| return result; | |
| } | |
| // There's no texture in the cache. Let's try to allocate it then. | |
| result = this->allocMaskTexture(elementsGenID, clipSpaceIBounds, false); | |
| if (NULL == result) { | |
| fAACache.reset(); | |
| return NULL; | |
| } | |
| // Set the matrix so that rendered clip elements are transformed to mask space from clip | |
| // space. | |
| SkMatrix translate; | |
| translate.setTranslate(clipToMaskOffset); | |
| // The texture may be larger than necessary, this rect represents the part of the texture | |
| // we populate with a rasterization of the clip. | |
| SkIRect maskSpaceIBounds = SkIRect::MakeWH(clipSpaceIBounds.width(), clipSpaceIBounds.height()); | |
| // The scratch texture that we are drawing into can be substantially larger than the mask. Only | |
| // clear the part that we care about. | |
| fClipTarget->clear(&maskSpaceIBounds, | |
| GrReducedClip::kAllIn_InitialState == initialState ? 0xffffffff : 0x00000000, | |
| true, | |
| result->asRenderTarget()); | |
| // When we use the stencil in the below loop it is important to have this clip installed. | |
| // The second pass that zeros the stencil buffer renders the rect maskSpaceIBounds so the first | |
| // pass must not set values outside of this bounds or stencil values outside the rect won't be | |
| // cleared. | |
| GrClip clip(maskSpaceIBounds); | |
| SkAutoTUnref<GrTexture> temp; | |
| // walk through each clip element and perform its set op | |
| for (GrReducedClip::ElementList::Iter iter = elements.headIter(); iter.get(); iter.next()) { | |
| const Element* element = iter.get(); | |
| SkRegion::Op op = element->getOp(); | |
| bool invert = element->isInverseFilled(); | |
| if (invert || SkRegion::kIntersect_Op == op || SkRegion::kReverseDifference_Op == op) { | |
| GrPipelineBuilder pipelineBuilder; | |
| pipelineBuilder.setClip(clip); | |
| GrPathRenderer* pr = NULL; | |
| bool useTemp = !this->canStencilAndDrawElement(&pipelineBuilder, result, &pr, element); | |
| GrTexture* dst; | |
| // This is the bounds of the clip element in the space of the alpha-mask. The temporary | |
| // mask buffer can be substantially larger than the actually clip stack element. We | |
| // touch the minimum number of pixels necessary and use decal mode to combine it with | |
| // the accumulator. | |
| SkIRect maskSpaceElementIBounds; | |
| if (useTemp) { | |
| if (invert) { | |
| maskSpaceElementIBounds = maskSpaceIBounds; | |
| } else { | |
| SkRect elementBounds = element->getBounds(); | |
| elementBounds.offset(clipToMaskOffset); | |
| elementBounds.roundOut(&maskSpaceElementIBounds); | |
| } | |
| if (!temp) { | |
| temp.reset(this->createTempMask(maskSpaceIBounds.fRight, | |
| maskSpaceIBounds.fBottom)); | |
| if (!temp) { | |
| fAACache.reset(); | |
| return NULL; | |
| } | |
| } | |
| dst = temp; | |
| // clear the temp target and set blend to replace | |
| fClipTarget->clear(&maskSpaceElementIBounds, | |
| invert ? 0xffffffff : 0x00000000, | |
| true, | |
| dst->asRenderTarget()); | |
| set_coverage_drawing_xpf(SkRegion::kReplace_Op, invert, &pipelineBuilder); | |
| } else { | |
| // draw directly into the result with the stencil set to make the pixels affected | |
| // by the clip shape be non-zero. | |
| dst = result; | |
| GR_STATIC_CONST_SAME_STENCIL(kStencilInElement, | |
| kReplace_StencilOp, | |
| kReplace_StencilOp, | |
| kAlways_StencilFunc, | |
| 0xffff, | |
| 0xffff, | |
| 0xffff); | |
| pipelineBuilder.setStencil(kStencilInElement); | |
| set_coverage_drawing_xpf(op, invert, &pipelineBuilder); | |
| } | |
| if (!this->drawElement(&pipelineBuilder, translate, dst, element, pr)) { | |
| fAACache.reset(); | |
| return NULL; | |
| } | |
| if (useTemp) { | |
| GrPipelineBuilder backgroundPipelineBuilder; | |
| backgroundPipelineBuilder.setRenderTarget(result->asRenderTarget()); | |
| // Now draw into the accumulator using the real operation and the temp buffer as a | |
| // texture | |
| this->mergeMask(&backgroundPipelineBuilder, | |
| result, | |
| temp, | |
| op, | |
| maskSpaceIBounds, | |
| maskSpaceElementIBounds); | |
| } else { | |
| GrPipelineBuilder backgroundPipelineBuilder; | |
| backgroundPipelineBuilder.setRenderTarget(result->asRenderTarget()); | |
| set_coverage_drawing_xpf(op, !invert, &backgroundPipelineBuilder); | |
| // Draw to the exterior pixels (those with a zero stencil value). | |
| GR_STATIC_CONST_SAME_STENCIL(kDrawOutsideElement, | |
| kZero_StencilOp, | |
| kZero_StencilOp, | |
| kEqual_StencilFunc, | |
| 0xffff, | |
| 0x0000, | |
| 0xffff); | |
| backgroundPipelineBuilder.setStencil(kDrawOutsideElement); | |
| // The color passed in here does not matter since the coverageSetOpXP won't read it. | |
| fClipTarget->drawSimpleRect(&backgroundPipelineBuilder, GrColor_WHITE, translate, | |
| clipSpaceIBounds); | |
| } | |
| } else { | |
| GrPipelineBuilder pipelineBuilder; | |
| // all the remaining ops can just be directly draw into the accumulation buffer | |
| set_coverage_drawing_xpf(op, false, &pipelineBuilder); | |
| // The color passed in here does not matter since the coverageSetOpXP won't read it. | |
| this->drawElement(&pipelineBuilder, translate, result, element); | |
| } | |
| } | |
| fCurrClipMaskType = kAlpha_ClipMaskType; | |
| return result; | |
| } | |
| //////////////////////////////////////////////////////////////////////////////// | |
| // Create a 1-bit clip mask in the stencil buffer. 'devClipBounds' are in device | |
| // (as opposed to canvas) coordinates | |
| bool GrClipMaskManager::createStencilClipMask(GrRenderTarget* rt, | |
| int32_t elementsGenID, | |
| GrReducedClip::InitialState initialState, | |
| const GrReducedClip::ElementList& elements, | |
| const SkIRect& clipSpaceIBounds, | |
| const SkIPoint& clipSpaceToStencilOffset) { | |
| SkASSERT(kNone_ClipMaskType == fCurrClipMaskType); | |
| SkASSERT(rt); | |
| GrStencilAttachment* stencilAttachment = rt->renderTargetPriv().attachStencilAttachment(); | |
| if (NULL == stencilAttachment) { | |
| return false; | |
| } | |
| if (stencilAttachment->mustRenderClip(elementsGenID, clipSpaceIBounds, clipSpaceToStencilOffset)) { | |
| stencilAttachment->setLastClip(elementsGenID, clipSpaceIBounds, clipSpaceToStencilOffset); | |
| // Set the matrix so that rendered clip elements are transformed from clip to stencil space. | |
| SkVector translate = { | |
| SkIntToScalar(clipSpaceToStencilOffset.fX), | |
| SkIntToScalar(clipSpaceToStencilOffset.fY) | |
| }; | |
| SkMatrix viewMatrix; | |
| viewMatrix.setTranslate(translate); | |
| // We set the current clip to the bounds so that our recursive draws are scissored to them. | |
| SkIRect stencilSpaceIBounds(clipSpaceIBounds); | |
| stencilSpaceIBounds.offset(clipSpaceToStencilOffset); | |
| GrClip clip(stencilSpaceIBounds); | |
| int clipBit = stencilAttachment->bits(); | |
| SkASSERT((clipBit <= 16) && "Ganesh only handles 16b or smaller stencil buffers"); | |
| clipBit = (1 << (clipBit-1)); | |
| fClipTarget->clearStencilClip(stencilSpaceIBounds, | |
| GrReducedClip::kAllIn_InitialState == initialState, | |
| rt); | |
| // walk through each clip element and perform its set op | |
| // with the existing clip. | |
| for (GrReducedClip::ElementList::Iter iter(elements.headIter()); iter.get(); iter.next()) { | |
| const Element* element = iter.get(); | |
| GrPipelineBuilder pipelineBuilder; | |
| pipelineBuilder.setClip(clip); | |
| pipelineBuilder.setRenderTarget(rt); | |
| pipelineBuilder.setDisableColorXPFactory(); | |
| // if the target is MSAA then we want MSAA enabled when the clip is soft | |
| if (rt->isMultisampled()) { | |
| pipelineBuilder.setState(GrPipelineBuilder::kHWAntialias_Flag, element->isAA()); | |
| } | |
| bool fillInverted = false; | |
| // enabled at bottom of loop | |
| fClipMode = kIgnoreClip_StencilClipMode; | |
| // This will be used to determine whether the clip shape can be rendered into the | |
| // stencil with arbitrary stencil settings. | |
| GrPathRenderer::StencilSupport stencilSupport; | |
| GrStrokeInfo stroke(SkStrokeRec::kFill_InitStyle); | |
| SkRegion::Op op = element->getOp(); | |
| GrPathRenderer* pr = NULL; | |
| SkPath clipPath; | |
| if (Element::kRect_Type == element->getType()) { | |
| stencilSupport = GrPathRenderer::kNoRestriction_StencilSupport; | |
| fillInverted = false; | |
| } else { | |
| element->asPath(&clipPath); | |
| fillInverted = clipPath.isInverseFillType(); | |
| if (fillInverted) { | |
| clipPath.toggleInverseFillType(); | |
| } | |
| pr = this->getContext()->getPathRenderer(fClipTarget, | |
| &pipelineBuilder, | |
| viewMatrix, | |
| clipPath, | |
| stroke, | |
| false, | |
| GrPathRendererChain::kStencilOnly_DrawType, | |
| &stencilSupport); | |
| if (NULL == pr) { | |
| return false; | |
| } | |
| } | |
| int passes; | |
| GrStencilSettings stencilSettings[GrStencilSettings::kMaxStencilClipPasses]; | |
| bool canRenderDirectToStencil = | |
| GrPathRenderer::kNoRestriction_StencilSupport == stencilSupport; | |
| bool canDrawDirectToClip; // Given the renderer, the element, | |
| // fill rule, and set operation can | |
| // we render the element directly to | |
| // stencil bit used for clipping. | |
| canDrawDirectToClip = GrStencilSettings::GetClipPasses(op, | |
| canRenderDirectToStencil, | |
| clipBit, | |
| fillInverted, | |
| &passes, | |
| stencilSettings); | |
| // draw the element to the client stencil bits if necessary | |
| if (!canDrawDirectToClip) { | |
| GR_STATIC_CONST_SAME_STENCIL(gDrawToStencil, | |
| kIncClamp_StencilOp, | |
| kIncClamp_StencilOp, | |
| kAlways_StencilFunc, | |
| 0xffff, | |
| 0x0000, | |
| 0xffff); | |
| if (Element::kRect_Type == element->getType()) { | |
| *pipelineBuilder.stencil() = gDrawToStencil; | |
| // We need this AGP until everything is in GrBatch | |
| fClipTarget->drawSimpleRect(&pipelineBuilder, | |
| GrColor_WHITE, | |
| viewMatrix, | |
| element->getRect()); | |
| } else { | |
| if (!clipPath.isEmpty()) { | |
| if (canRenderDirectToStencil) { | |
| *pipelineBuilder.stencil() = gDrawToStencil; | |
| pr->drawPath(fClipTarget, &pipelineBuilder, GrColor_WHITE, | |
| viewMatrix, clipPath, stroke, false); | |
| } else { | |
| pr->stencilPath(fClipTarget, &pipelineBuilder, viewMatrix, | |
| clipPath, stroke); | |
| } | |
| } | |
| } | |
| } | |
| // now we modify the clip bit by rendering either the clip | |
| // element directly or a bounding rect of the entire clip. | |
| fClipMode = kModifyClip_StencilClipMode; | |
| for (int p = 0; p < passes; ++p) { | |
| GrPipelineBuilder pipelineBuilderCopy(pipelineBuilder); | |
| *pipelineBuilderCopy.stencil() = stencilSettings[p]; | |
| if (canDrawDirectToClip) { | |
| if (Element::kRect_Type == element->getType()) { | |
| // We need this AGP until everything is in GrBatch | |
| fClipTarget->drawSimpleRect(&pipelineBuilderCopy, | |
| GrColor_WHITE, | |
| viewMatrix, | |
| element->getRect()); | |
| } else { | |
| pr->drawPath(fClipTarget, &pipelineBuilderCopy, GrColor_WHITE, | |
| viewMatrix, clipPath, stroke, false); | |
| } | |
| } else { | |
| // The view matrix is setup to do clip space -> stencil space translation, so | |
| // draw rect in clip space. | |
| fClipTarget->drawSimpleRect(&pipelineBuilderCopy, | |
| GrColor_WHITE, | |
| viewMatrix, | |
| SkRect::Make(clipSpaceIBounds)); | |
| } | |
| } | |
| } | |
| } | |
| // set this last because recursive draws may overwrite it back to kNone. | |
| SkASSERT(kNone_ClipMaskType == fCurrClipMaskType); | |
| fCurrClipMaskType = kStencil_ClipMaskType; | |
| fClipMode = kRespectClip_StencilClipMode; | |
| return true; | |
| } | |
| // mapping of clip-respecting stencil funcs to normal stencil funcs | |
| // mapping depends on whether stencil-clipping is in effect. | |
| static const GrStencilFunc | |
| gSpecialToBasicStencilFunc[2][kClipStencilFuncCount] = { | |
| {// Stencil-Clipping is DISABLED, we are effectively always inside the clip | |
| // In the Clip Funcs | |
| kAlways_StencilFunc, // kAlwaysIfInClip_StencilFunc | |
| kEqual_StencilFunc, // kEqualIfInClip_StencilFunc | |
| kLess_StencilFunc, // kLessIfInClip_StencilFunc | |
| kLEqual_StencilFunc, // kLEqualIfInClip_StencilFunc | |
| // Special in the clip func that forces user's ref to be 0. | |
| kNotEqual_StencilFunc, // kNonZeroIfInClip_StencilFunc | |
| // make ref 0 and do normal nequal. | |
| }, | |
| {// Stencil-Clipping is ENABLED | |
| // In the Clip Funcs | |
| kEqual_StencilFunc, // kAlwaysIfInClip_StencilFunc | |
| // eq stencil clip bit, mask | |
| // out user bits. | |
| kEqual_StencilFunc, // kEqualIfInClip_StencilFunc | |
| // add stencil bit to mask and ref | |
| kLess_StencilFunc, // kLessIfInClip_StencilFunc | |
| kLEqual_StencilFunc, // kLEqualIfInClip_StencilFunc | |
| // for both of these we can add | |
| // the clip bit to the mask and | |
| // ref and compare as normal | |
| // Special in the clip func that forces user's ref to be 0. | |
| kLess_StencilFunc, // kNonZeroIfInClip_StencilFunc | |
| // make ref have only the clip bit set | |
| // and make comparison be less | |
| // 10..0 < 1..user_bits.. | |
| } | |
| }; | |
| namespace { | |
| // Sets the settings to clip against the stencil buffer clip while ignoring the | |
| // client bits. | |
| const GrStencilSettings& basic_apply_stencil_clip_settings() { | |
| // stencil settings to use when clip is in stencil | |
| GR_STATIC_CONST_SAME_STENCIL_STRUCT(gSettings, | |
| kKeep_StencilOp, | |
| kKeep_StencilOp, | |
| kAlwaysIfInClip_StencilFunc, | |
| 0x0000, | |
| 0x0000, | |
| 0x0000); | |
| return *GR_CONST_STENCIL_SETTINGS_PTR_FROM_STRUCT_PTR(&gSettings); | |
| } | |
| } | |
| void GrClipMaskManager::setPipelineBuilderStencil(GrPipelineBuilder* pipelineBuilder, | |
| GrPipelineBuilder::AutoRestoreStencil* ars) { | |
| // We make two copies of the StencilSettings here (except in the early | |
| // exit scenario. One copy from draw state to the stack var. Then another | |
| // from the stack var to the gpu. We could make this class hold a ptr to | |
| // GrGpu's fStencilSettings and eliminate the stack copy here. | |
| // use stencil for clipping if clipping is enabled and the clip | |
| // has been written into the stencil. | |
| GrStencilSettings settings; | |
| // The GrGpu client may not be using the stencil buffer but we may need to | |
| // enable it in order to respect a stencil clip. | |
| if (pipelineBuilder->getStencil().isDisabled()) { | |
| if (GrClipMaskManager::kRespectClip_StencilClipMode == fClipMode) { | |
| settings = basic_apply_stencil_clip_settings(); | |
| } else { | |
| return; | |
| } | |
| } else { | |
| settings = pipelineBuilder->getStencil(); | |
| } | |
| int stencilBits = 0; | |
| GrRenderTarget* rt = pipelineBuilder->getRenderTarget(); | |
| GrStencilAttachment* stencilAttachment = rt->renderTargetPriv().attachStencilAttachment(); | |
| if (stencilAttachment) { | |
| stencilBits = stencilAttachment->bits(); | |
| } | |
| SkASSERT(fClipTarget->caps()->stencilWrapOpsSupport() || !settings.usesWrapOp()); | |
| SkASSERT(fClipTarget->caps()->twoSidedStencilSupport() || !settings.isTwoSided()); | |
| this->adjustStencilParams(&settings, fClipMode, stencilBits); | |
| ars->set(pipelineBuilder); | |
| pipelineBuilder->setStencil(settings); | |
| } | |
| void GrClipMaskManager::adjustStencilParams(GrStencilSettings* settings, | |
| StencilClipMode mode, | |
| int stencilBitCnt) { | |
| SkASSERT(stencilBitCnt > 0); | |
| if (kModifyClip_StencilClipMode == mode) { | |
| // We assume that this clip manager itself is drawing to the GrGpu and | |
| // has already setup the correct values. | |
| return; | |
| } | |
| unsigned int clipBit = (1 << (stencilBitCnt - 1)); | |
| unsigned int userBits = clipBit - 1; | |
| GrStencilSettings::Face face = GrStencilSettings::kFront_Face; | |
| bool twoSided = fClipTarget->caps()->twoSidedStencilSupport(); | |
| bool finished = false; | |
| while (!finished) { | |
| GrStencilFunc func = settings->func(face); | |
| uint16_t writeMask = settings->writeMask(face); | |
| uint16_t funcMask = settings->funcMask(face); | |
| uint16_t funcRef = settings->funcRef(face); | |
| SkASSERT((unsigned) func < kStencilFuncCount); | |
| writeMask &= userBits; | |
| if (func >= kBasicStencilFuncCount) { | |
| int respectClip = kRespectClip_StencilClipMode == mode; | |
| if (respectClip) { | |
| // The GrGpu class should have checked this | |
| SkASSERT(this->isClipInStencil()); | |
| switch (func) { | |
| case kAlwaysIfInClip_StencilFunc: | |
| funcMask = clipBit; | |
| funcRef = clipBit; | |
| break; | |
| case kEqualIfInClip_StencilFunc: | |
| case kLessIfInClip_StencilFunc: | |
| case kLEqualIfInClip_StencilFunc: | |
| funcMask = (funcMask & userBits) | clipBit; | |
| funcRef = (funcRef & userBits) | clipBit; | |
| break; | |
| case kNonZeroIfInClip_StencilFunc: | |
| funcMask = (funcMask & userBits) | clipBit; | |
| funcRef = clipBit; | |
| break; | |
| default: | |
| SkFAIL("Unknown stencil func"); | |
| } | |
| } else { | |
| funcMask &= userBits; | |
| funcRef &= userBits; | |
| } | |
| const GrStencilFunc* table = | |
| gSpecialToBasicStencilFunc[respectClip]; | |
| func = table[func - kBasicStencilFuncCount]; | |
| SkASSERT(func >= 0 && func < kBasicStencilFuncCount); | |
| } else { | |
| funcMask &= userBits; | |
| funcRef &= userBits; | |
| } | |
| settings->setFunc(face, func); | |
| settings->setWriteMask(face, writeMask); | |
| settings->setFuncMask(face, funcMask); | |
| settings->setFuncRef(face, funcRef); | |
| if (GrStencilSettings::kFront_Face == face) { | |
| face = GrStencilSettings::kBack_Face; | |
| finished = !twoSided; | |
| } else { | |
| finished = true; | |
| } | |
| } | |
| if (!twoSided) { | |
| settings->copyFrontSettingsToBack(); | |
| } | |
| } | |
| //////////////////////////////////////////////////////////////////////////////// | |
| GrTexture* GrClipMaskManager::createSoftwareClipMask(int32_t elementsGenID, | |
| GrReducedClip::InitialState initialState, | |
| const GrReducedClip::ElementList& elements, | |
| const SkVector& clipToMaskOffset, | |
| const SkIRect& clipSpaceIBounds) { | |
| SkASSERT(kNone_ClipMaskType == fCurrClipMaskType); | |
| GrTexture* result = this->getCachedMaskTexture(elementsGenID, clipSpaceIBounds); | |
| if (result) { | |
| return result; | |
| } | |
| // The mask texture may be larger than necessary. We round out the clip space bounds and pin | |
| // the top left corner of the resulting rect to the top left of the texture. | |
| SkIRect maskSpaceIBounds = SkIRect::MakeWH(clipSpaceIBounds.width(), clipSpaceIBounds.height()); | |
| GrSWMaskHelper helper(this->getContext()); | |
| // Set the matrix so that rendered clip elements are transformed to mask space from clip | |
| // space. | |
| SkMatrix translate; | |
| translate.setTranslate(clipToMaskOffset); | |
| helper.init(maskSpaceIBounds, &translate, false); | |
| helper.clear(GrReducedClip::kAllIn_InitialState == initialState ? 0xFF : 0x00); | |
| SkStrokeRec stroke(SkStrokeRec::kFill_InitStyle); | |
| for (GrReducedClip::ElementList::Iter iter(elements.headIter()) ; iter.get(); iter.next()) { | |
| const Element* element = iter.get(); | |
| SkRegion::Op op = element->getOp(); | |
| if (SkRegion::kIntersect_Op == op || SkRegion::kReverseDifference_Op == op) { | |
| // Intersect and reverse difference require modifying pixels outside of the geometry | |
| // that is being "drawn". In both cases we erase all the pixels outside of the geometry | |
| // but leave the pixels inside the geometry alone. For reverse difference we invert all | |
| // the pixels before clearing the ones outside the geometry. | |
| if (SkRegion::kReverseDifference_Op == op) { | |
| SkRect temp = SkRect::Make(clipSpaceIBounds); | |
| // invert the entire scene | |
| helper.draw(temp, SkRegion::kXOR_Op, false, 0xFF); | |
| } | |
| SkPath clipPath; | |
| element->asPath(&clipPath); | |
| clipPath.toggleInverseFillType(); | |
| helper.draw(clipPath, stroke, SkRegion::kReplace_Op, element->isAA(), 0x00); | |
| continue; | |
| } | |
| // The other ops (union, xor, diff) only affect pixels inside | |
| // the geometry so they can just be drawn normally | |
| if (Element::kRect_Type == element->getType()) { | |
| helper.draw(element->getRect(), op, element->isAA(), 0xFF); | |
| } else { | |
| SkPath path; | |
| element->asPath(&path); | |
| helper.draw(path, stroke, op, element->isAA(), 0xFF); | |
| } | |
| } | |
| // Allocate clip mask texture | |
| result = this->allocMaskTexture(elementsGenID, clipSpaceIBounds, true); | |
| if (NULL == result) { | |
| fAACache.reset(); | |
| return NULL; | |
| } | |
| helper.toTexture(result); | |
| fCurrClipMaskType = kAlpha_ClipMaskType; | |
| return result; | |
| } | |
| //////////////////////////////////////////////////////////////////////////////// | |
| void GrClipMaskManager::purgeResources() { | |
| fAACache.purgeResources(); | |
| } | |
| void GrClipMaskManager::setClipTarget(GrClipTarget* clipTarget) { | |
| fClipTarget = clipTarget; | |
| fAACache.setContext(clipTarget->getContext()); | |
| } | |
| void GrClipMaskManager::adjustPathStencilParams(const GrStencilAttachment* stencilAttachment, | |
| GrStencilSettings* settings) { | |
| if (stencilAttachment) { | |
| int stencilBits = stencilAttachment->bits(); | |
| this->adjustStencilParams(settings, fClipMode, stencilBits); | |
| } | |
| } |