| /* |
| * Copyright 2016 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "GrClipStackClip.h" |
| |
| #include "GrAppliedClip.h" |
| #include "GrContextPriv.h" |
| #include "GrDrawingManager.h" |
| #include "GrRenderTargetContextPriv.h" |
| #include "GrFixedClip.h" |
| #include "GrGpuResourcePriv.h" |
| #include "GrRenderTargetPriv.h" |
| #include "GrStencilAttachment.h" |
| #include "GrSWMaskHelper.h" |
| #include "effects/GrConvexPolyEffect.h" |
| #include "effects/GrRRectEffect.h" |
| #include "effects/GrTextureDomain.h" |
| |
| typedef SkClipStack::Element Element; |
| typedef GrReducedClip::InitialState InitialState; |
| typedef GrReducedClip::ElementList ElementList; |
| |
| static const int kMaxAnalyticElements = 4; |
| |
| bool GrClipStackClip::quickContains(const SkRect& rect) const { |
| if (!fStack || fStack->isWideOpen()) { |
| return true; |
| } |
| return fStack->quickContains(rect.makeOffset(SkIntToScalar(fOrigin.x()), |
| SkIntToScalar(fOrigin.y()))); |
| } |
| |
| bool GrClipStackClip::quickContains(const SkRRect& rrect) const { |
| if (!fStack || fStack->isWideOpen()) { |
| return true; |
| } |
| return fStack->quickContains(rrect.makeOffset(SkIntToScalar(fOrigin.fX), |
| SkIntToScalar(fOrigin.fY))); |
| } |
| |
| bool GrClipStackClip::isRRect(const SkRect& origRTBounds, SkRRect* rr, bool* aa) const { |
| if (!fStack) { |
| return false; |
| } |
| const SkRect* rtBounds = &origRTBounds; |
| SkRect tempRTBounds; |
| bool origin = fOrigin.fX || fOrigin.fY; |
| if (origin) { |
| tempRTBounds = origRTBounds; |
| tempRTBounds.offset(SkIntToScalar(fOrigin.fX), SkIntToScalar(fOrigin.fY)); |
| rtBounds = &tempRTBounds; |
| } |
| if (fStack->isRRect(*rtBounds, rr, aa)) { |
| if (origin) { |
| rr->offset(-SkIntToScalar(fOrigin.fX), -SkIntToScalar(fOrigin.fY)); |
| } |
| return true; |
| } |
| return false; |
| } |
| |
| void GrClipStackClip::getConservativeBounds(int width, int height, SkIRect* devResult, |
| bool* isIntersectionOfRects) const { |
| if (!fStack) { |
| devResult->setXYWH(0, 0, width, height); |
| if (isIntersectionOfRects) { |
| *isIntersectionOfRects = true; |
| } |
| return; |
| } |
| SkRect devBounds; |
| fStack->getConservativeBounds(-fOrigin.x(), -fOrigin.y(), width, height, &devBounds, |
| isIntersectionOfRects); |
| devBounds.roundOut(devResult); |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // set up the draw state to enable the aa clipping mask. |
| static sk_sp<GrFragmentProcessor> create_fp_for_mask(GrTexture* result, |
| const SkIRect &devBound) { |
| SkIRect domainTexels = SkIRect::MakeWH(devBound.width(), devBound.height()); |
| return GrDeviceSpaceTextureDecalFragmentProcessor::Make(result, domainTexels, |
| {devBound.fLeft, devBound.fTop}); |
| } |
| |
| // 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 GrClipStackClip::PathNeedsSWRenderer(GrContext* context, |
| bool hasUserStencilSettings, |
| const GrRenderTargetContext* renderTargetContext, |
| 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; |
| } |
| |
| GrShape shape(path, GrStyle::SimpleFill()); |
| GrPathRenderer::CanDrawPathArgs canDrawArgs; |
| canDrawArgs.fShaderCaps = context->caps()->shaderCaps(); |
| canDrawArgs.fViewMatrix = &viewMatrix; |
| canDrawArgs.fShape = &shape; |
| canDrawArgs.fAntiAlias = element->isAA(); |
| canDrawArgs.fHasUserStencilSettings = hasUserStencilSettings; |
| canDrawArgs.fIsStencilBufferMSAA = renderTargetContext->isStencilBufferMultisampled(); |
| |
| // the 'false' parameter disallows use of the SW path renderer |
| GrPathRenderer* pr = |
| context->contextPriv().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 GrClipStackClip::UseSWOnlyPath(GrContext* context, |
| bool hasUserStencilSettings, |
| const GrRenderTargetContext* renderTargetContext, |
| const GrReducedClip& reducedClip) { |
| // 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. |
| SkMatrix translate; |
| translate.setTranslate(SkIntToScalar(-reducedClip.left()), SkIntToScalar(-reducedClip.top())); |
| |
| for (ElementList::Iter iter(reducedClip.elements()); iter.get(); iter.next()) { |
| const Element* element = iter.get(); |
| |
| SkCanvas::ClipOp op = element->getOp(); |
| bool invert = element->isInverseFilled(); |
| bool needsStencil = invert || |
| SkCanvas::kIntersect_Op == op || SkCanvas::kReverseDifference_Op == op; |
| |
| if (PathNeedsSWRenderer(context, hasUserStencilSettings, |
| renderTargetContext, translate, element, nullptr, needsStencil)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| static bool get_analytic_clip_processor(const ElementList& elements, |
| bool abortIfAA, |
| const SkVector& clipToRTOffset, |
| const SkRect& drawBounds, |
| sk_sp<GrFragmentProcessor>* resultFP) { |
| SkRect boundsInClipSpace; |
| boundsInClipSpace = drawBounds.makeOffset(-clipToRTOffset.fX, -clipToRTOffset.fY); |
| SkASSERT(elements.count() <= kMaxAnalyticElements); |
| SkSTArray<kMaxAnalyticElements, sk_sp<GrFragmentProcessor>> fps; |
| ElementList::Iter iter(elements); |
| while (iter.get()) { |
| SkCanvas::ClipOp 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 (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 GrClipStackClip::apply(GrContext* context, GrRenderTargetContext* renderTargetContext, |
| bool useHWAA, bool hasUserStencilSettings, GrAppliedClip* out) const { |
| if (!fStack || fStack->isWideOpen()) { |
| return true; |
| } |
| |
| SkRect devBounds = SkRect::MakeIWH(renderTargetContext->width(), renderTargetContext->height()); |
| if (!devBounds.intersect(out->clippedDrawBounds())) { |
| return false; |
| } |
| |
| const SkScalar clipX = SkIntToScalar(fOrigin.x()), |
| clipY = SkIntToScalar(fOrigin.y()); |
| |
| SkRect clipSpaceDevBounds = devBounds.makeOffset(clipX, clipY); |
| const GrReducedClip reducedClip(*fStack, clipSpaceDevBounds, |
| renderTargetContext->priv().maxWindowRectangles()); |
| |
| if (reducedClip.hasIBounds() && |
| !GrClip::IsInsideClip(reducedClip.ibounds(), clipSpaceDevBounds)) { |
| SkIRect scissorSpaceIBounds(reducedClip.ibounds()); |
| scissorSpaceIBounds.offset(-fOrigin); |
| out->addScissor(scissorSpaceIBounds); |
| } |
| |
| if (!reducedClip.windowRectangles().empty()) { |
| out->addWindowRectangles(reducedClip.windowRectangles(), fOrigin, |
| GrWindowRectsState::Mode::kExclusive); |
| } |
| |
| if (reducedClip.elements().isEmpty()) { |
| return InitialState::kAllIn == reducedClip.initialState(); |
| } |
| |
| #ifdef SK_DEBUG |
| SkASSERT(reducedClip.hasIBounds()); |
| SkIRect rtIBounds = SkIRect::MakeWH(renderTargetContext->width(), |
| renderTargetContext->height()); |
| SkIRect clipIBounds = reducedClip.ibounds().makeOffset(-fOrigin.x(), -fOrigin.y()); |
| SkASSERT(rtIBounds.contains(clipIBounds)); // Mask shouldn't be larger than the RT. |
| #endif |
| |
| // 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 (reducedClip.elements().count() <= kMaxAnalyticElements) { |
| // When there are multiple samples we want to do per-sample clipping, not compute a |
| // fractional pixel coverage. |
| bool disallowAnalyticAA = renderTargetContext->isStencilBufferMultisampled(); |
| if (disallowAnalyticAA && !renderTargetContext->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 = useHWAA || hasUserStencilSettings; |
| } |
| sk_sp<GrFragmentProcessor> clipFP; |
| if (reducedClip.requiresAA() && |
| get_analytic_clip_processor(reducedClip.elements(), disallowAnalyticAA, |
| {-clipX, -clipY}, devBounds, &clipFP)) { |
| out->addCoverageFP(std::move(clipFP)); |
| return true; |
| } |
| } |
| |
| // If the stencil buffer is multisampled we can use it to do everything. |
| if (!renderTargetContext->isStencilBufferMultisampled() && reducedClip.requiresAA()) { |
| sk_sp<GrTexture> result; |
| if (UseSWOnlyPath(context, hasUserStencilSettings, renderTargetContext, reducedClip)) { |
| // The clip geometry is complex enough that it will be more efficient to create it |
| // entirely in software |
| result = CreateSoftwareClipMask(context->textureProvider(), reducedClip); |
| } else { |
| result = CreateAlphaClipMask(context, reducedClip); |
| // 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 = reducedClip.ibounds(); |
| rtSpaceMaskBounds.offset(-fOrigin); |
| out->addCoverageFP(create_fp_for_mask(result.get(), rtSpaceMaskBounds)); |
| return true; |
| } |
| // if alpha clip mask creation fails fall through to the non-AA code paths |
| } |
| |
| GrRenderTarget* rt = renderTargetContext->accessRenderTarget(); |
| if (!rt) { |
| return true; |
| } |
| |
| // use the stencil clip if we can't represent the clip as a rectangle. |
| if (!context->resourceProvider()->attachStencilAttachment(rt)) { |
| SkDebugf("WARNING: failed to attach stencil buffer for clip mask. Clip will be ignored.\n"); |
| return true; |
| } |
| |
| // This relies on the property that a reduced sub-rect of the last clip will contain all the |
| // relevant window rectangles that were in the last clip. This subtle requirement will go away |
| // after clipping is overhauled. |
| if (renderTargetContext->priv().mustRenderClip(reducedClip.elementsGenID(), |
| reducedClip.ibounds(), fOrigin)) { |
| reducedClip.drawStencilClipMask(context, renderTargetContext, fOrigin); |
| renderTargetContext->priv().setLastClip(reducedClip.elementsGenID(), reducedClip.ibounds(), |
| fOrigin); |
| } |
| out->addStencilClip(); |
| 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; |
| // SkToS16 because image filters outset layers to a size indicated by the filter, which can |
| // sometimes result in negative coordinates from clip space. |
| builder[1] = SkToS16(bounds.fLeft) | (SkToS16(bounds.fRight) << 16); |
| builder[2] = SkToS16(bounds.fTop) | (SkToS16(bounds.fBottom) << 16); |
| } |
| |
| sk_sp<GrTexture> GrClipStackClip::CreateAlphaClipMask(GrContext* context, |
| const GrReducedClip& reducedClip) { |
| GrResourceProvider* resourceProvider = context->resourceProvider(); |
| GrUniqueKey key; |
| GetClipMaskKey(reducedClip.elementsGenID(), reducedClip.ibounds(), &key); |
| if (GrTexture* texture = resourceProvider->findAndRefTextureByUniqueKey(key)) { |
| return sk_sp<GrTexture>(texture); |
| } |
| |
| sk_sp<GrRenderTargetContext> rtc(context->makeRenderTargetContextWithFallback( |
| SkBackingFit::kApprox, |
| reducedClip.width(), |
| reducedClip.height(), |
| kAlpha_8_GrPixelConfig, |
| nullptr)); |
| if (!rtc) { |
| return nullptr; |
| } |
| |
| if (!reducedClip.drawAlphaClipMask(rtc.get())) { |
| return nullptr; |
| } |
| |
| sk_sp<GrTexture> texture(rtc->asTexture()); |
| if (!texture) { |
| return nullptr; |
| } |
| |
| texture->resourcePriv().setUniqueKey(key); |
| return texture; |
| } |
| |
| sk_sp<GrTexture> GrClipStackClip::CreateSoftwareClipMask(GrTextureProvider* texProvider, |
| const GrReducedClip& reducedClip) { |
| GrUniqueKey key; |
| GetClipMaskKey(reducedClip.elementsGenID(), reducedClip.ibounds(), &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(reducedClip.width(), reducedClip.height()); |
| |
| GrSWMaskHelper helper(texProvider); |
| |
| // Set the matrix so that rendered clip elements are transformed to mask space from clip |
| // space. |
| SkMatrix translate; |
| translate.setTranslate(SkIntToScalar(-reducedClip.left()), SkIntToScalar(-reducedClip.top())); |
| |
| if (!helper.init(maskSpaceIBounds, &translate)) { |
| return nullptr; |
| } |
| helper.clear(InitialState::kAllIn == reducedClip.initialState() ? 0xFF : 0x00); |
| |
| for (ElementList::Iter iter(reducedClip.elements()); iter.get(); iter.next()) { |
| const Element* element = iter.get(); |
| SkCanvas::ClipOp op = element->getOp(); |
| |
| if (SkCanvas::kIntersect_Op == op || SkCanvas::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 (SkCanvas::kReverseDifference_Op == op) { |
| SkRect temp = SkRect::Make(reducedClip.ibounds()); |
| // invert the entire scene |
| helper.drawRect(temp, SkRegion::kXOR_Op, false, 0xFF); |
| } |
| SkPath clipPath; |
| element->asPath(&clipPath); |
| clipPath.toggleInverseFillType(); |
| GrShape shape(clipPath, GrStyle::SimpleFill()); |
| helper.drawShape(shape, 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(), (SkRegion::Op)op, element->isAA(), 0xFF); |
| } else { |
| SkPath path; |
| element->asPath(&path); |
| GrShape shape(path, GrStyle::SimpleFill()); |
| helper.drawShape(shape, (SkRegion::Op)op, element->isAA(), 0xFF); |
| } |
| } |
| |
| // Allocate clip mask texture |
| GrSurfaceDesc desc; |
| desc.fWidth = reducedClip.width(); |
| desc.fHeight = reducedClip.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; |
| } |
