| /* |
| * 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 "GrCaps.h" |
| #include "GrDrawingManager.h" |
| #include "GrDrawContext.h" |
| #include "GrDrawTarget.h" |
| #include "GrGpuResourcePriv.h" |
| #include "GrPaint.h" |
| #include "GrPathRenderer.h" |
| #include "GrRenderTarget.h" |
| #include "GrRenderTargetPriv.h" |
| #include "GrResourceProvider.h" |
| #include "GrStencilAttachment.h" |
| #include "GrSWMaskHelper.h" |
| #include "SkRasterClip.h" |
| #include "SkTLazy.h" |
| #include "batches/GrRectBatchFactory.h" |
| #include "effects/GrConvexPolyEffect.h" |
| #include "effects/GrPorterDuffXferProcessor.h" |
| #include "effects/GrRRectEffect.h" |
| #include "effects/GrTextureDomain.h" |
| |
| typedef SkClipStack::Element Element; |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // set up the draw state to enable the aa clipping mask. Besides setting up the |
| // stage matrix this also alters the vertex layout |
| static const GrFragmentProcessor* create_fp_for_mask(GrTexture* result, const SkIRect &devBound) { |
| 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()); |
| return GrTextureDomainEffect::Create(result, |
| mat, |
| GrTextureDomain::MakeTexelDomain(result, domainTexels), |
| GrTextureDomain::kDecal_Mode, |
| GrTextureParams::kNone_FilterMode, |
| kDevice_GrCoordSet); |
| } |
| |
| static void draw_non_aa_rect(GrDrawTarget* drawTarget, |
| const GrPipelineBuilder& pipelineBuilder, |
| GrColor color, |
| const SkMatrix& viewMatrix, |
| const SkRect& rect) { |
| SkAutoTUnref<GrDrawBatch> batch(GrRectBatchFactory::CreateNonAAFill(color, viewMatrix, rect, |
| nullptr, nullptr)); |
| drawTarget->drawBatch(pipelineBuilder, batch); |
| } |
| |
| // Does the path in 'element' require SW rendering? If so, return true (and, |
| // optionally, set 'prOut' to NULL. If not, return false (and, optionally, set |
| // 'prOut' to the non-SW path renderer that will do the job). |
| bool GrClipMaskManager::PathNeedsSWRenderer(GrContext* context, |
| bool isStencilDisabled, |
| const GrRenderTarget* rt, |
| const SkMatrix& viewMatrix, |
| const Element* element, |
| GrPathRenderer** prOut, |
| bool needsStencil) { |
| if (Element::kRect_Type == element->getType()) { |
| // rects can always be drawn directly w/o using the software path |
| // TODO: skip rrects once we're drawing them directly. |
| if (prOut) { |
| *prOut = nullptr; |
| } |
| return false; |
| } else { |
| // We shouldn't get here with an empty clip element. |
| SkASSERT(Element::kEmpty_Type != element->getType()); |
| |
| // the gpu alpha mask will draw the inverse paths as non-inverse to a temp buffer |
| SkPath path; |
| element->asPath(&path); |
| if (path.isInverseFillType()) { |
| path.toggleInverseFillType(); |
| } |
| GrStrokeInfo stroke(SkStrokeRec::kFill_InitStyle); |
| |
| GrPathRendererChain::DrawType type; |
| |
| if (needsStencil) { |
| type = element->isAA() |
| ? GrPathRendererChain::kStencilAndColorAntiAlias_DrawType |
| : GrPathRendererChain::kStencilAndColor_DrawType; |
| } else { |
| type = element->isAA() |
| ? GrPathRendererChain::kColorAntiAlias_DrawType |
| : GrPathRendererChain::kColor_DrawType; |
| } |
| |
| GrPathRenderer::CanDrawPathArgs canDrawArgs; |
| canDrawArgs.fShaderCaps = context->caps()->shaderCaps(); |
| canDrawArgs.fViewMatrix = &viewMatrix; |
| canDrawArgs.fPath = &path; |
| canDrawArgs.fStroke = &stroke; |
| canDrawArgs.fAntiAlias = element->isAA(); |
| canDrawArgs.fIsStencilDisabled = isStencilDisabled; |
| canDrawArgs.fIsStencilBufferMSAA = rt->isStencilBufferMultisampled(); |
| |
| // the 'false' parameter disallows use of the SW path renderer |
| GrPathRenderer* pr = context->drawingManager()->getPathRenderer(canDrawArgs, false, type); |
| if (prOut) { |
| *prOut = pr; |
| } |
| return SkToBool(!pr); |
| } |
| } |
| |
| // Determines whether it is possible to draw the element to both the stencil buffer and the |
| // alpha mask simultaneously. If so and the element is a path a compatible path renderer is |
| // also returned. |
| GrPathRenderer* GrClipMaskManager::GetPathRenderer(GrContext* context, |
| GrTexture* texture, |
| const SkMatrix& viewMatrix, |
| const SkClipStack::Element* element) { |
| GrPathRenderer* pr; |
| static const bool kNeedsStencil = true; |
| static const bool kStencilIsDisabled = true; |
| PathNeedsSWRenderer(context, |
| kStencilIsDisabled, |
| texture->asRenderTarget(), |
| viewMatrix, |
| element, |
| &pr, |
| kNeedsStencil); |
| return pr; |
| } |
| |
| GrClipMaskManager::GrClipMaskManager(GrDrawTarget* drawTarget, bool debugClipBatchToBounds) |
| : fDrawTarget(drawTarget) |
| , fClipMode(kIgnoreClip_StencilClipMode) |
| , fDebugClipBatchToBounds(debugClipBatchToBounds) { |
| } |
| |
| GrContext* GrClipMaskManager::getContext() { |
| return fDrawTarget->cmmAccess().context(); |
| } |
| |
| const GrCaps* GrClipMaskManager::caps() const { |
| return fDrawTarget->caps(); |
| } |
| |
| GrResourceProvider* GrClipMaskManager::resourceProvider() { |
| return fDrawTarget->cmmAccess().resourceProvider(); |
| } |
| /* |
| * 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 GrRenderTarget* rt, |
| 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. |
| |
| // Set the matrix so that rendered clip elements are transformed to mask space from clip |
| // space. |
| const SkMatrix translate = SkMatrix::MakeTrans(clipToMaskOffset.fX, clipToMaskOffset.fY); |
| |
| 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(); |
| bool needsStencil = invert || |
| SkRegion::kIntersect_Op == op || SkRegion::kReverseDifference_Op == op; |
| |
| if (PathNeedsSWRenderer(this->getContext(), pipelineBuilder.getStencil().isDisabled(), |
| rt, translate, element, nullptr, needsStencil)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| bool GrClipMaskManager::getAnalyticClipProcessor(const GrReducedClip::ElementList& elements, |
| bool abortIfAA, |
| SkVector& clipToRTOffset, |
| const SkRect* drawBounds, |
| const GrFragmentProcessor** resultFP) { |
| SkRect boundsInClipSpace; |
| if (drawBounds) { |
| boundsInClipSpace = *drawBounds; |
| boundsInClipSpace.offset(-clipToRTOffset.fX, -clipToRTOffset.fY); |
| } |
| SkASSERT(elements.count() <= kMaxAnalyticElements); |
| const GrFragmentProcessor* fps[kMaxAnalyticElements]; |
| for (int i = 0; i < kMaxAnalyticElements; ++i) { |
| fps[i] = nullptr; |
| } |
| int fpCnt = 0; |
| 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 (abortIfAA) { |
| failed = true; |
| break; |
| } |
| edgeType = |
| invert ? kInverseFillAA_GrProcessorEdgeType : kFillAA_GrProcessorEdgeType; |
| } else { |
| edgeType = |
| invert ? kInverseFillBW_GrProcessorEdgeType : kFillBW_GrProcessorEdgeType; |
| } |
| |
| switch (iter.get()->getType()) { |
| case SkClipStack::Element::kPath_Type: |
| fps[fpCnt] = GrConvexPolyEffect::Create(edgeType, iter.get()->getPath(), |
| &clipToRTOffset); |
| break; |
| case SkClipStack::Element::kRRect_Type: { |
| SkRRect rrect = iter.get()->getRRect(); |
| rrect.offset(clipToRTOffset.fX, clipToRTOffset.fY); |
| fps[fpCnt] = GrRRectEffect::Create(edgeType, rrect); |
| break; |
| } |
| case SkClipStack::Element::kRect_Type: { |
| SkRect rect = iter.get()->getRect(); |
| rect.offset(clipToRTOffset.fX, clipToRTOffset.fY); |
| fps[fpCnt] = GrConvexPolyEffect::Create(edgeType, rect); |
| break; |
| } |
| default: |
| break; |
| } |
| if (!fps[fpCnt]) { |
| failed = true; |
| break; |
| } |
| fpCnt++; |
| } |
| iter.next(); |
| } |
| |
| *resultFP = nullptr; |
| if (!failed && fpCnt) { |
| *resultFP = GrFragmentProcessor::RunInSeries(fps, fpCnt); |
| } |
| for (int i = 0; i < fpCnt; ++i) { |
| fps[i]->unref(); |
| } |
| return !failed; |
| } |
| |
| static void add_rect_to_clip(const GrClip& clip, const SkRect& devRect, GrClip* out) { |
| switch (clip.clipType()) { |
| case GrClip::kClipStack_ClipType: { |
| SkClipStack* stack = new SkClipStack; |
| *stack = *clip.clipStack(); |
| // The stack is actually in clip space not device space. |
| SkRect clipRect = devRect; |
| SkPoint origin = { SkIntToScalar(clip.origin().fX), SkIntToScalar(clip.origin().fY) }; |
| clipRect.offset(origin); |
| SkIRect iclipRect; |
| clipRect.roundOut(&iclipRect); |
| clipRect = SkRect::Make(iclipRect); |
| stack->clipDevRect(clipRect, SkRegion::kIntersect_Op, false); |
| out->setClipStack(stack, &clip.origin()); |
| break; |
| } |
| case GrClip::kWideOpen_ClipType: |
| *out = GrClip(devRect); |
| break; |
| case GrClip::kIRect_ClipType: { |
| SkIRect intersect; |
| devRect.roundOut(&intersect); |
| if (intersect.intersect(clip.irect())) { |
| *out = GrClip(intersect); |
| } else { |
| *out = clip; |
| } |
| break; |
| } |
| } |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // sort out what kind of clip mask needs to be created: alpha, stencil, |
| // scissor, or entirely software |
| bool GrClipMaskManager::setupClipping(const GrPipelineBuilder& pipelineBuilder, |
| GrPipelineBuilder::AutoRestoreStencil* ars, |
| const SkRect* devBounds, |
| GrAppliedClip* out) { |
| if (kRespectClip_StencilClipMode == fClipMode) { |
| fClipMode = kIgnoreClip_StencilClipMode; |
| } |
| |
| GrReducedClip::ElementList elements; |
| 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()); |
| GrClip devBoundsClip; |
| bool doDevBoundsClip = fDebugClipBatchToBounds && devBounds; |
| if (doDevBoundsClip) { |
| add_rect_to_clip(pipelineBuilder.clip(), *devBounds, &devBoundsClip); |
| } |
| const GrClip& clip = doDevBoundsClip ? devBoundsClip : 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)) { |
| out->fScissorState.set(scissor); |
| this->setPipelineBuilderStencil(pipelineBuilder, ars); |
| return true; |
| } |
| return false; |
| } |
| case GrClip::kClipStack_ClipType: { |
| clipSpaceRTIBounds.offset(clip.origin()); |
| SkIRect clipSpaceReduceQueryBounds; |
| #define DISABLE_DEV_BOUNDS_FOR_CLIP_REDUCTION 1 |
| if (devBounds && !DISABLE_DEV_BOUNDS_FOR_CLIP_REDUCTION) { |
| SkIRect devIBounds = devBounds->roundOut(); |
| devIBounds.offset(clip.origin()); |
| if (!clipSpaceReduceQueryBounds.intersect(clipSpaceRTIBounds, devIBounds)) { |
| return false; |
| } |
| } else { |
| clipSpaceReduceQueryBounds = clipSpaceRTIBounds; |
| } |
| GrReducedClip::ReduceClipStack(*clip.clipStack(), |
| clipSpaceReduceQueryBounds, |
| &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() <= kMaxAnalyticElements) { |
| SkVector clipToRTOffset = { SkIntToScalar(-clip.origin().fX), |
| SkIntToScalar(-clip.origin().fY) }; |
| // When there are multiple samples we want to do per-sample clipping, not compute a |
| // fractional pixel coverage. |
| bool disallowAnalyticAA = rt->isUnifiedMultisampled() || pipelineBuilder.hasMixedSamples(); |
| const GrFragmentProcessor* clipFP = nullptr; |
| if (elements.isEmpty() || |
| (requiresAA && |
| this->getAnalyticClipProcessor(elements, disallowAnalyticAA, clipToRTOffset, devBounds, |
| &clipFP))) { |
| SkIRect scissorSpaceIBounds(clipSpaceIBounds); |
| scissorSpaceIBounds.offset(-clip.origin()); |
| if (nullptr == devBounds || |
| !SkRect::Make(scissorSpaceIBounds).contains(*devBounds)) { |
| out->fScissorState.set(scissorSpaceIBounds); |
| } |
| this->setPipelineBuilderStencil(pipelineBuilder, ars); |
| out->fClipCoverageFP.reset(clipFP); |
| return true; |
| } |
| } |
| |
| // If the stencil buffer is multisampled we can use it to do everything. |
| if (!rt->isStencilBufferMultisampled() && requiresAA) { |
| SkAutoTUnref<GrTexture> result; |
| |
| // 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, rt, clipToMaskOffset, elements)) { |
| // The clip geometry is complex enough that it will be more efficient to create it |
| // entirely in software |
| result.reset(this->createSoftwareClipMask(genID, |
| initialState, |
| elements, |
| clipToMaskOffset, |
| clipSpaceIBounds)); |
| } else { |
| result.reset(this->createAlphaClipMask(genID, |
| initialState, |
| elements, |
| clipToMaskOffset, |
| clipSpaceIBounds)); |
| // If createAlphaClipMask fails it means useSWOnlyPath has a bug |
| SkASSERT(result); |
| } |
| |
| if (result) { |
| // 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()); |
| out->fClipCoverageFP.reset(create_fp_for_mask(result, rtSpaceMaskBounds)); |
| this->setPipelineBuilderStencil(pipelineBuilder, ars); |
| return true; |
| } |
| // if alpha clip mask creation fails fall through to the non-AA code paths |
| } |
| |
| // 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); |
| out->fScissorState.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) { |
| |
| GrRenderTarget* rt = target->asRenderTarget(); |
| pipelineBuilder->setRenderTarget(rt); |
| |
| // 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); |
| |
| SkAutoTUnref<GrDrawBatch> batch( |
| GrRectBatchFactory::CreateAAFill(color, viewMatrix, element->getRect(), |
| devRect)); |
| |
| fDrawTarget->drawBatch(*pipelineBuilder, batch); |
| } else { |
| draw_non_aa_rect(fDrawTarget, *pipelineBuilder, color, viewMatrix, |
| element->getRect()); |
| } |
| return true; |
| } |
| default: { |
| SkPath path; |
| element->asPath(&path); |
| if (path.isInverseFillType()) { |
| path.toggleInverseFillType(); |
| } |
| GrStrokeInfo stroke(SkStrokeRec::kFill_InitStyle); |
| if (nullptr == pr) { |
| GrPathRendererChain::DrawType type; |
| type = element->isAA() ? GrPathRendererChain::kColorAntiAlias_DrawType : |
| GrPathRendererChain::kColor_DrawType; |
| |
| GrPathRenderer::CanDrawPathArgs canDrawArgs; |
| canDrawArgs.fShaderCaps = this->getContext()->caps()->shaderCaps(); |
| canDrawArgs.fViewMatrix = &viewMatrix; |
| canDrawArgs.fPath = &path; |
| canDrawArgs.fStroke = &stroke; |
| canDrawArgs.fAntiAlias = element->isAA();; |
| canDrawArgs.fIsStencilDisabled = pipelineBuilder->getStencil().isDisabled(); |
| canDrawArgs.fIsStencilBufferMSAA = rt->isStencilBufferMultisampled(); |
| |
| pr = this->getContext()->drawingManager()->getPathRenderer(canDrawArgs, false, type); |
| } |
| if (nullptr == pr) { |
| return false; |
| } |
| GrPathRenderer::DrawPathArgs args; |
| args.fTarget = fDrawTarget; |
| args.fResourceProvider = this->getContext()->resourceProvider(); |
| args.fPipelineBuilder = pipelineBuilder; |
| args.fColor = color; |
| args.fViewMatrix = &viewMatrix; |
| args.fPath = &path; |
| args.fStroke = &stroke; |
| args.fAntiAlias = element->isAA(); |
| pr->drawPath(args); |
| break; |
| } |
| } |
| return true; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // Create a 8-bit clip mask in alpha |
| |
| static void GetClipMaskKey(int32_t clipGenID, const SkIRect& bounds, GrUniqueKey* key) { |
| static const GrUniqueKey::Domain kDomain = GrUniqueKey::GenerateDomain(); |
| GrUniqueKey::Builder builder(key, kDomain, 3); |
| builder[0] = clipGenID; |
| builder[1] = SkToU16(bounds.fLeft) | (SkToU16(bounds.fRight) << 16); |
| builder[2] = SkToU16(bounds.fTop) | (SkToU16(bounds.fBottom) << 16); |
| } |
| |
| GrTexture* GrClipMaskManager::createCachedMask(int width, int height, const GrUniqueKey& key, |
| bool renderTarget) { |
| GrSurfaceDesc desc; |
| desc.fWidth = width; |
| desc.fHeight = height; |
| desc.fFlags = renderTarget ? kRenderTarget_GrSurfaceFlag : kNone_GrSurfaceFlags; |
| if (!renderTarget || this->caps()->isConfigRenderable(kAlpha_8_GrPixelConfig, false)) { |
| desc.fConfig = kAlpha_8_GrPixelConfig; |
| } else { |
| desc.fConfig = kRGBA_8888_GrPixelConfig; |
| } |
| |
| GrTexture* texture = this->resourceProvider()->createApproxTexture(desc, 0); |
| if (!texture) { |
| return nullptr; |
| } |
| texture->resourcePriv().setUniqueKey(key); |
| return texture; |
| } |
| |
| GrTexture* GrClipMaskManager::createAlphaClipMask(int32_t elementsGenID, |
| GrReducedClip::InitialState initialState, |
| const GrReducedClip::ElementList& elements, |
| const SkVector& clipToMaskOffset, |
| const SkIRect& clipSpaceIBounds) { |
| GrResourceProvider* resourceProvider = this->resourceProvider(); |
| GrUniqueKey key; |
| GetClipMaskKey(elementsGenID, clipSpaceIBounds, &key); |
| if (GrTexture* texture = resourceProvider->findAndRefTextureByUniqueKey(key)) { |
| return texture; |
| } |
| |
| // There's no texture in the cache. Let's try to allocate it then. |
| SkAutoTUnref<GrTexture> texture(this->createCachedMask( |
| clipSpaceIBounds.width(), clipSpaceIBounds.height(), key, true)); |
| if (!texture) { |
| return nullptr; |
| } |
| |
| // Set the matrix so that rendered clip elements are transformed to mask space from clip |
| // space. |
| const SkMatrix translate = SkMatrix::MakeTrans(clipToMaskOffset.fX, clipToMaskOffset.fY); |
| |
| // 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. |
| fDrawTarget->clear(&maskSpaceIBounds, |
| GrReducedClip::kAllIn_InitialState == initialState ? 0xffffffff : 0x00000000, |
| true, |
| texture->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. |
| const GrClip clip(maskSpaceIBounds); |
| |
| // 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) { |
| |
| GrPathRenderer* pr = GetPathRenderer(this->getContext(), |
| texture, translate, element); |
| if (Element::kRect_Type != element->getType() && !pr) { |
| // useSWOnlyPath should now filter out all cases where gpu-side mask merging would |
| // be performed (i.e., pr would be NULL for a non-rect path). See https://bug.skia.org/4519 |
| // for rationale and details. |
| SkASSERT(0); |
| continue; |
| } |
| |
| { |
| GrPipelineBuilder pipelineBuilder; |
| |
| pipelineBuilder.setClip(clip); |
| pipelineBuilder.setRenderTarget(texture->asRenderTarget()); |
| SkASSERT(pipelineBuilder.getStencil().isDisabled()); |
| |
| // draw directly into the result with the stencil set to make the pixels affected |
| // by the clip shape be non-zero. |
| 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, texture, element, pr)) { |
| texture->resourcePriv().removeUniqueKey(); |
| return nullptr; |
| } |
| } |
| |
| { |
| GrPipelineBuilder backgroundPipelineBuilder; |
| backgroundPipelineBuilder.setRenderTarget(texture->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. |
| draw_non_aa_rect(fDrawTarget, backgroundPipelineBuilder, GrColor_WHITE, translate, |
| SkRect::Make(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, texture, element); |
| } |
| } |
| |
| return texture.detach(); |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // 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(rt); |
| |
| GrStencilAttachment* stencilAttachment = this->resourceProvider()->attachStencilAttachment(rt); |
| if (nullptr == 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)); |
| |
| fDrawTarget->cmmAccess().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->isStencilBufferMultisampled()) { |
| 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 = nullptr; |
| 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(); |
| } |
| |
| SkASSERT(pipelineBuilder.getStencil().isDisabled()); |
| |
| GrPathRenderer::CanDrawPathArgs canDrawArgs; |
| canDrawArgs.fShaderCaps = this->getContext()->caps()->shaderCaps(); |
| canDrawArgs.fViewMatrix = &viewMatrix; |
| canDrawArgs.fPath = &clipPath; |
| canDrawArgs.fStroke = &stroke; |
| canDrawArgs.fAntiAlias = false; |
| canDrawArgs.fIsStencilDisabled = pipelineBuilder.getStencil().isDisabled(); |
| canDrawArgs.fIsStencilBufferMSAA = rt->isStencilBufferMultisampled(); |
| |
| pr = this->getContext()->drawingManager()->getPathRenderer(canDrawArgs, false, |
| GrPathRendererChain::kStencilOnly_DrawType, |
| &stencilSupport); |
| if (nullptr == 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; |
| |
| draw_non_aa_rect(fDrawTarget, pipelineBuilder, GrColor_WHITE, viewMatrix, |
| element->getRect()); |
| } else { |
| if (!clipPath.isEmpty()) { |
| if (canRenderDirectToStencil) { |
| *pipelineBuilder.stencil() = gDrawToStencil; |
| |
| GrPathRenderer::DrawPathArgs args; |
| args.fTarget = fDrawTarget; |
| args.fResourceProvider = this->getContext()->resourceProvider(); |
| args.fPipelineBuilder = &pipelineBuilder; |
| args.fColor = GrColor_WHITE; |
| args.fViewMatrix = &viewMatrix; |
| args.fPath = &clipPath; |
| args.fStroke = &stroke; |
| args.fAntiAlias = false; |
| pr->drawPath(args); |
| } else { |
| GrPathRenderer::StencilPathArgs args; |
| args.fTarget = fDrawTarget; |
| args.fResourceProvider = this->getContext()->resourceProvider(); |
| args.fPipelineBuilder = &pipelineBuilder; |
| args.fViewMatrix = &viewMatrix; |
| args.fPath = &clipPath; |
| args.fStroke = &stroke; |
| pr->stencilPath(args); |
| } |
| } |
| } |
| } |
| |
| // 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) { |
| *pipelineBuilder.stencil() = stencilSettings[p]; |
| |
| if (canDrawDirectToClip) { |
| if (Element::kRect_Type == element->getType()) { |
| draw_non_aa_rect(fDrawTarget, pipelineBuilder, GrColor_WHITE, viewMatrix, |
| element->getRect()); |
| } else { |
| GrPathRenderer::DrawPathArgs args; |
| args.fTarget = fDrawTarget; |
| args.fResourceProvider = this->getContext()->resourceProvider(); |
| args.fPipelineBuilder = &pipelineBuilder; |
| args.fColor = GrColor_WHITE; |
| args.fViewMatrix = &viewMatrix; |
| args.fPath = &clipPath; |
| args.fStroke = &stroke; |
| args.fAntiAlias = false; |
| pr->drawPath(args); |
| } |
| } else { |
| // The view matrix is setup to do clip space -> stencil space translation, so |
| // draw rect in clip space. |
| draw_non_aa_rect(fDrawTarget, pipelineBuilder, GrColor_WHITE, viewMatrix, |
| SkRect::Make(clipSpaceIBounds)); |
| } |
| } |
| } |
| } |
| 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(const 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 = this->resourceProvider()->attachStencilAttachment(rt); |
| if (stencilAttachment) { |
| stencilBits = stencilAttachment->bits(); |
| } |
| |
| SkASSERT(this->caps()->stencilWrapOpsSupport() || !settings.usesWrapOp()); |
| SkASSERT(this->caps()->twoSidedStencilSupport() || !settings.isTwoSided()); |
| this->adjustStencilParams(&settings, fClipMode, stencilBits); |
| ars->set(&pipelineBuilder); |
| ars->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 = this->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) { |
| 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) { |
| GrUniqueKey key; |
| GetClipMaskKey(elementsGenID, clipSpaceIBounds, &key); |
| GrResourceProvider* resourceProvider = this->resourceProvider(); |
| if (GrTexture* texture = resourceProvider->findAndRefTextureByUniqueKey(key)) { |
| return texture; |
| } |
| |
| // 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 |
| GrTexture* result = this->createCachedMask(clipSpaceIBounds.width(), clipSpaceIBounds.height(), |
| key, false); |
| if (nullptr == result) { |
| return nullptr; |
| } |
| helper.toTexture(result); |
| |
| return result; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| void GrClipMaskManager::adjustPathStencilParams(const GrStencilAttachment* stencilAttachment, |
| GrStencilSettings* settings) { |
| if (stencilAttachment) { |
| int stencilBits = stencilAttachment->bits(); |
| this->adjustStencilParams(settings, fClipMode, stencilBits); |
| } |
| } |
