| /* |
| * 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 "GrDrawContextPriv.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; |
| |
| static const int kMaxAnalyticElements = 4; |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // set up the draw state to enable the aa clipping mask. Besides setting up the |
| // stage matrix this also alters the vertex layout |
| static sk_sp<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 sk_sp<GrFragmentProcessor>(GrTextureDomainEffect::Make( |
| result, |
| mat, |
| GrTextureDomain::MakeTexelDomain(result, domainTexels), |
| GrTextureDomain::kDecal_Mode, |
| GrTextureParams::kNone_FilterMode, |
| kDevice_GrCoordSet)); |
| } |
| |
| // 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 hasUserStencilSettings, |
| const GrDrawContext* drawContext, |
| 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(); |
| } |
| |
| 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.fStyle = &GrStyle::SimpleFill(); |
| canDrawArgs.fAntiAlias = element->isAA(); |
| canDrawArgs.fHasUserStencilSettings = hasUserStencilSettings; |
| canDrawArgs.fIsStencilBufferMSAA = drawContext->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); |
| } |
| } |
| |
| /* |
| * 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(GrContext* context, |
| const GrPipelineBuilder& pipelineBuilder, |
| const GrDrawContext* drawContext, |
| 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(context, pipelineBuilder.hasUserStencilSettings(), |
| drawContext, translate, element, nullptr, needsStencil)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| static bool get_analytic_clip_processor(const GrReducedClip::ElementList& elements, |
| bool abortIfAA, |
| SkVector& clipToRTOffset, |
| const SkRect* drawBounds, |
| sk_sp<GrFragmentProcessor>* resultFP) { |
| SkRect boundsInClipSpace; |
| if (drawBounds) { |
| boundsInClipSpace = *drawBounds; |
| boundsInClipSpace.offset(-clipToRTOffset.fX, -clipToRTOffset.fY); |
| } |
| SkASSERT(elements.count() <= kMaxAnalyticElements); |
| SkSTArray<kMaxAnalyticElements, sk_sp<GrFragmentProcessor>> fps; |
| GrReducedClip::ElementList::Iter iter(elements); |
| 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: |
| return false; |
| } |
| if (!skip) { |
| GrPrimitiveEdgeType edgeType; |
| if (iter.get()->isAA()) { |
| if (abortIfAA) { |
| return false; |
| } |
| edgeType = |
| invert ? kInverseFillAA_GrProcessorEdgeType : kFillAA_GrProcessorEdgeType; |
| } else { |
| edgeType = |
| invert ? kInverseFillBW_GrProcessorEdgeType : kFillBW_GrProcessorEdgeType; |
| } |
| |
| switch (iter.get()->getType()) { |
| case SkClipStack::Element::kPath_Type: |
| fps.emplace_back(GrConvexPolyEffect::Make(edgeType, iter.get()->getPath(), |
| &clipToRTOffset)); |
| break; |
| case SkClipStack::Element::kRRect_Type: { |
| SkRRect rrect = iter.get()->getRRect(); |
| rrect.offset(clipToRTOffset.fX, clipToRTOffset.fY); |
| fps.emplace_back(GrRRectEffect::Make(edgeType, rrect)); |
| break; |
| } |
| case SkClipStack::Element::kRect_Type: { |
| SkRect rect = iter.get()->getRect(); |
| rect.offset(clipToRTOffset.fX, clipToRTOffset.fY); |
| fps.emplace_back(GrConvexPolyEffect::Make(edgeType, rect)); |
| break; |
| } |
| default: |
| break; |
| } |
| if (!fps.back()) { |
| return false; |
| } |
| } |
| iter.next(); |
| } |
| |
| *resultFP = nullptr; |
| if (fps.count()) { |
| *resultFP = GrFragmentProcessor::RunInSeries(fps.begin(), fps.count()); |
| } |
| return true; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // sort out what kind of clip mask needs to be created: alpha, stencil, |
| // scissor, or entirely software |
| bool GrClipMaskManager::SetupClipping(GrContext* context, |
| const GrPipelineBuilder& pipelineBuilder, |
| GrDrawContext* drawContext, |
| const GrClipStackClip& clip, |
| const SkRect* devBounds, |
| GrAppliedClip* out) { |
| if (!clip.clipStack() || clip.clipStack()->isWideOpen()) { |
| return true; |
| } |
| |
| GrReducedClip::ElementList elements; |
| int32_t genID = 0; |
| GrReducedClip::InitialState initialState = GrReducedClip::kAllIn_InitialState; |
| SkIRect clipSpaceIBounds; |
| bool requiresAA = false; |
| |
| SkIRect clipSpaceRTIBounds = SkIRect::MakeWH(drawContext->width(), drawContext->height()); |
| clipSpaceRTIBounds.offset(clip.origin()); |
| |
| SkIRect clipSpaceReduceQueryBounds; |
| #define DISABLE_DEV_BOUNDS_FOR_CLIP_REDUCTION 0 |
| 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) { |
| return true; |
| } |
| } else { |
| return false; |
| } |
| } |
| |
| // 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 = drawContext->isStencilBufferMultisampled(); |
| if (disallowAnalyticAA && !drawContext->numColorSamples()) { |
| // With a single color sample, any coverage info is lost from color once it hits the |
| // color buffer anyway, so we may as well use coverage AA if nothing else in the pipe |
| // is multisampled. |
| disallowAnalyticAA = pipelineBuilder.isHWAntialias() || |
| pipelineBuilder.hasUserStencilSettings(); |
| } |
| sk_sp<GrFragmentProcessor> clipFP; |
| if (elements.isEmpty() || |
| (requiresAA && |
| get_analytic_clip_processor(elements, disallowAnalyticAA, clipToRTOffset, devBounds, |
| &clipFP))) { |
| SkIRect scissorSpaceIBounds(clipSpaceIBounds); |
| scissorSpaceIBounds.offset(-clip.origin()); |
| if (!devBounds || !SkRect::Make(scissorSpaceIBounds).contains(*devBounds)) { |
| out->makeScissoredFPBased(std::move(clipFP), scissorSpaceIBounds); |
| return true; |
| } |
| out->makeFPBased(std::move(clipFP)); |
| return true; |
| } |
| } |
| |
| // If the stencil buffer is multisampled we can use it to do everything. |
| if (!drawContext->isStencilBufferMultisampled() && requiresAA) { |
| sk_sp<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 (UseSWOnlyPath(context, pipelineBuilder, drawContext, |
| clipToMaskOffset, elements)) { |
| // The clip geometry is complex enough that it will be more efficient to create it |
| // entirely in software |
| result = CreateSoftwareClipMask(context->textureProvider(), |
| genID, |
| initialState, |
| elements, |
| clipToMaskOffset, |
| clipSpaceIBounds); |
| } else { |
| result = CreateAlphaClipMask(context, |
| 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->makeFPBased(create_fp_for_mask(result.get(), rtSpaceMaskBounds)); |
| 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(); |
| CreateStencilClipMask(context, |
| drawContext, |
| 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->makeScissoredStencil(true, scissorSpaceIBounds); |
| return true; |
| } |
| |
| static bool stencil_element(GrDrawContext* dc, |
| const GrFixedClip& clip, |
| const GrUserStencilSettings* ss, |
| const SkMatrix& viewMatrix, |
| const SkClipStack::Element* element) { |
| |
| // 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: |
| return dc->drawContextPriv().drawAndStencilRect(clip, ss, |
| element->getOp(), |
| element->isInverseFilled(), |
| element->isAA(), |
| viewMatrix, element->getRect()); |
| break; |
| default: { |
| SkPath path; |
| element->asPath(&path); |
| if (path.isInverseFillType()) { |
| path.toggleInverseFillType(); |
| } |
| |
| return dc->drawContextPriv().drawAndStencilPath(clip, ss, |
| element->getOp(), |
| element->isInverseFilled(), |
| element->isAA(), viewMatrix, path); |
| break; |
| } |
| } |
| |
| return false; |
| } |
| |
| static void draw_element(GrDrawContext* dc, |
| const GrClip& clip, // TODO: can this just always be WideOpen? |
| const GrPaint &paint, |
| const SkMatrix& viewMatrix, |
| const SkClipStack::Element* element) { |
| |
| // 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: |
| dc->drawRect(clip, paint, viewMatrix, element->getRect()); |
| break; |
| default: { |
| SkPath path; |
| element->asPath(&path); |
| if (path.isInverseFillType()) { |
| path.toggleInverseFillType(); |
| } |
| |
| dc->drawPath(clip, paint, viewMatrix, path, GrStyle::SimpleFill()); |
| break; |
| } |
| } |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // 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); |
| } |
| |
| sk_sp<GrTexture> GrClipMaskManager::CreateAlphaClipMask(GrContext* context, |
| int32_t elementsGenID, |
| GrReducedClip::InitialState initialState, |
| const GrReducedClip::ElementList& elements, |
| const SkVector& clipToMaskOffset, |
| const SkIRect& clipSpaceIBounds) { |
| GrResourceProvider* resourceProvider = context->resourceProvider(); |
| GrUniqueKey key; |
| GetClipMaskKey(elementsGenID, clipSpaceIBounds, &key); |
| if (GrTexture* texture = resourceProvider->findAndRefTextureByUniqueKey(key)) { |
| return sk_sp<GrTexture>(texture); |
| } |
| |
| // There's no texture in the cache. Let's try to allocate it then. |
| GrPixelConfig config = kRGBA_8888_GrPixelConfig; |
| if (context->caps()->isConfigRenderable(kAlpha_8_GrPixelConfig, false)) { |
| config = kAlpha_8_GrPixelConfig; |
| } |
| |
| sk_sp<GrDrawContext> dc(context->newDrawContext(SkBackingFit::kApprox, |
| clipSpaceIBounds.width(), |
| clipSpaceIBounds.height(), |
| config)); |
| if (!dc) { |
| return nullptr; |
| } |
| |
| // 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. |
| dc->clear(&maskSpaceIBounds, |
| GrReducedClip::kAllIn_InitialState == initialState ? 0xffffffff : 0x00000000, |
| true); |
| |
| // 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); |
| |
| // It is important that we use maskSpaceIBounds as the stencil rect in the below loop. |
| // 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. |
| |
| // 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) { |
| GrFixedClip clip(maskSpaceIBounds); |
| |
| // draw directly into the result with the stencil set to make the pixels affected |
| // by the clip shape be non-zero. |
| static constexpr GrUserStencilSettings kStencilInElement( |
| GrUserStencilSettings::StaticInit< |
| 0xffff, |
| GrUserStencilTest::kAlways, |
| 0xffff, |
| GrUserStencilOp::kReplace, |
| GrUserStencilOp::kReplace, |
| 0xffff>() |
| ); |
| if (!stencil_element(dc.get(), clip, &kStencilInElement, |
| translate, element)) { |
| return nullptr; |
| } |
| |
| // Draw to the exterior pixels (those with a zero stencil value). |
| static constexpr GrUserStencilSettings kDrawOutsideElement( |
| GrUserStencilSettings::StaticInit< |
| 0x0000, |
| GrUserStencilTest::kEqual, |
| 0xffff, |
| GrUserStencilOp::kZero, |
| GrUserStencilOp::kZero, |
| 0xffff>() |
| ); |
| if (!dc->drawContextPriv().drawAndStencilRect(clip, &kDrawOutsideElement, |
| op, !invert, false, |
| translate, |
| SkRect::Make(clipSpaceIBounds))) { |
| return nullptr; |
| } |
| } else { |
| // all the remaining ops can just be directly draw into the accumulation buffer |
| GrPaint paint; |
| paint.setAntiAlias(element->isAA()); |
| paint.setCoverageSetOpXPFactory(op, false); |
| |
| draw_element(dc.get(), GrNoClip(), paint, translate, element); |
| } |
| } |
| |
| sk_sp<GrTexture> texture(dc->asTexture()); |
| SkASSERT(texture); |
| texture->resourcePriv().setUniqueKey(key); |
| return texture; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // Create a 1-bit clip mask in the stencil buffer. 'devClipBounds' are in device |
| // (as opposed to canvas) coordinates |
| bool GrClipMaskManager::CreateStencilClipMask(GrContext* context, |
| GrDrawContext* drawContext, |
| int32_t elementsGenID, |
| GrReducedClip::InitialState initialState, |
| const GrReducedClip::ElementList& elements, |
| const SkIRect& clipSpaceIBounds, |
| const SkIPoint& clipSpaceToStencilOffset) { |
| SkASSERT(drawContext); |
| |
| GrStencilAttachment* stencilAttachment = context->resourceProvider()->attachStencilAttachment( |
| drawContext->accessRenderTarget()); |
| if (nullptr == stencilAttachment) { |
| return false; |
| } |
| |
| // TODO: these need to be swapped over to using a StencilAttachmentProxy |
| 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); |
| GrFixedClip clip(stencilSpaceIBounds); |
| |
| drawContext->drawContextPriv().clearStencilClip( |
| stencilSpaceIBounds, |
| GrReducedClip::kAllIn_InitialState == initialState); |
| |
| // 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(); |
| bool useHWAA = element->isAA() && drawContext->isStencilBufferMultisampled(); |
| |
| bool fillInverted = false; |
| // enabled at bottom of loop |
| clip.enableStencilClip(false); |
| |
| // This will be used to determine whether the clip shape can be rendered into the |
| // stencil with arbitrary stencil settings. |
| GrPathRenderer::StencilSupport stencilSupport; |
| |
| 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(); |
| } |
| |
| GrPathRenderer::CanDrawPathArgs canDrawArgs; |
| canDrawArgs.fShaderCaps = context->caps()->shaderCaps(); |
| canDrawArgs.fViewMatrix = &viewMatrix; |
| canDrawArgs.fPath = &clipPath; |
| canDrawArgs.fStyle = &GrStyle::SimpleFill(); |
| canDrawArgs.fAntiAlias = false; |
| canDrawArgs.fHasUserStencilSettings = false; |
| canDrawArgs.fIsStencilBufferMSAA = drawContext->isStencilBufferMultisampled(); |
| |
| pr = context->drawingManager()->getPathRenderer(canDrawArgs, false, |
| GrPathRendererChain::kStencilOnly_DrawType, |
| &stencilSupport); |
| if (!pr) { |
| return false; |
| } |
| } |
| |
| bool canRenderDirectToStencil = |
| GrPathRenderer::kNoRestriction_StencilSupport == stencilSupport; |
| bool drawDirectToClip; // Given the renderer, the element, |
| // fill rule, and set operation should |
| // we render the element directly to |
| // stencil bit used for clipping. |
| GrUserStencilSettings const* const* stencilPasses = |
| GrStencilSettings::GetClipPasses(op, canRenderDirectToStencil, fillInverted, |
| &drawDirectToClip); |
| |
| // draw the element to the client stencil bits if necessary |
| if (!drawDirectToClip) { |
| static constexpr GrUserStencilSettings kDrawToStencil( |
| GrUserStencilSettings::StaticInit< |
| 0x0000, |
| GrUserStencilTest::kAlways, |
| 0xffff, |
| GrUserStencilOp::kIncMaybeClamp, |
| GrUserStencilOp::kIncMaybeClamp, |
| 0xffff>() |
| ); |
| if (Element::kRect_Type == element->getType()) { |
| drawContext->drawContextPriv().stencilRect(clip, &kDrawToStencil, useHWAA, |
| viewMatrix, element->getRect()); |
| } else { |
| if (!clipPath.isEmpty()) { |
| if (canRenderDirectToStencil) { |
| GrPaint paint; |
| paint.setXPFactory(GrDisableColorXPFactory::Make()); |
| paint.setAntiAlias(element->isAA()); |
| |
| GrPathRenderer::DrawPathArgs args; |
| args.fResourceProvider = context->resourceProvider(); |
| args.fPaint = &paint; |
| args.fUserStencilSettings = &kDrawToStencil; |
| args.fDrawContext = drawContext; |
| args.fClip = &clip; |
| args.fColor = GrColor_WHITE; |
| args.fViewMatrix = &viewMatrix; |
| args.fPath = &clipPath; |
| args.fStyle = &GrStyle::SimpleFill(); |
| args.fAntiAlias = false; |
| args.fGammaCorrect = false; |
| pr->drawPath(args); |
| } else { |
| GrPathRenderer::StencilPathArgs args; |
| args.fResourceProvider = context->resourceProvider(); |
| args.fDrawContext = drawContext; |
| args.fClip = &clip; |
| args.fViewMatrix = &viewMatrix; |
| args.fPath = &clipPath; |
| args.fIsAA = element->isAA(); |
| pr->stencilPath(args); |
| } |
| } |
| } |
| } |
| |
| // now we modify the clip bit by rendering either the clip |
| // element directly or a bounding rect of the entire clip. |
| clip.enableStencilClip(true); |
| for (GrUserStencilSettings const* const* pass = stencilPasses; *pass; ++pass) { |
| |
| if (drawDirectToClip) { |
| if (Element::kRect_Type == element->getType()) { |
| drawContext->drawContextPriv().stencilRect(clip, *pass, useHWAA, viewMatrix, |
| element->getRect()); |
| } else { |
| GrPaint paint; |
| paint.setXPFactory(GrDisableColorXPFactory::Make()); |
| paint.setAntiAlias(element->isAA()); |
| |
| GrPathRenderer::DrawPathArgs args; |
| args.fResourceProvider = context->resourceProvider(); |
| args.fPaint = &paint; |
| args.fUserStencilSettings = *pass; |
| args.fDrawContext = drawContext; |
| args.fClip = &clip; |
| args.fColor = GrColor_WHITE; |
| args.fViewMatrix = &viewMatrix; |
| args.fPath = &clipPath; |
| args.fStyle = &GrStyle::SimpleFill(); |
| args.fAntiAlias = false; |
| args.fGammaCorrect = false; |
| pr->drawPath(args); |
| } |
| } else { |
| // The view matrix is setup to do clip space -> stencil space translation, so |
| // draw rect in clip space. |
| drawContext->drawContextPriv().stencilRect(clip, *pass, false, viewMatrix, |
| SkRect::Make(clipSpaceIBounds)); |
| } |
| } |
| } |
| } |
| return true; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| sk_sp<GrTexture> GrClipMaskManager::CreateSoftwareClipMask( |
| GrTextureProvider* texProvider, |
| int32_t elementsGenID, |
| GrReducedClip::InitialState initialState, |
| const GrReducedClip::ElementList& elements, |
| const SkVector& clipToMaskOffset, |
| const SkIRect& clipSpaceIBounds) { |
| GrUniqueKey key; |
| GetClipMaskKey(elementsGenID, clipSpaceIBounds, &key); |
| if (GrTexture* texture = texProvider->findAndRefTextureByUniqueKey(key)) { |
| return sk_sp<GrTexture>(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(texProvider); |
| |
| // 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); |
| helper.clear(GrReducedClip::kAllIn_InitialState == initialState ? 0xFF : 0x00); |
| |
| 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.drawRect(temp, SkRegion::kXOR_Op, false, 0xFF); |
| } |
| SkPath clipPath; |
| element->asPath(&clipPath); |
| clipPath.toggleInverseFillType(); |
| helper.drawPath(clipPath, GrStyle::SimpleFill(), 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.drawRect(element->getRect(), op, element->isAA(), 0xFF); |
| } else { |
| SkPath path; |
| element->asPath(&path); |
| helper.drawPath(path, GrStyle::SimpleFill(), op, element->isAA(), 0xFF); |
| } |
| } |
| |
| // Allocate clip mask texture |
| GrSurfaceDesc desc; |
| desc.fWidth = clipSpaceIBounds.width(); |
| desc.fHeight = clipSpaceIBounds.height(); |
| desc.fConfig = kAlpha_8_GrPixelConfig; |
| |
| sk_sp<GrTexture> result(texProvider->createApproxTexture(desc)); |
| if (!result) { |
| return nullptr; |
| } |
| result->resourcePriv().setUniqueKey(key); |
| |
| helper.toTexture(result.get()); |
| |
| return result; |
| } |
