| /* |
| * 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 "GrReducedClip.h" |
| |
| #include "GrAppliedClip.h" |
| #include "GrClip.h" |
| #include "GrColor.h" |
| #include "GrContextPriv.h" |
| #include "GrRenderTargetContext.h" |
| #include "GrRenderTargetContextPriv.h" |
| #include "GrDrawingManager.h" |
| #include "GrFixedClip.h" |
| #include "GrPathRenderer.h" |
| #include "GrStencilSettings.h" |
| #include "GrStyle.h" |
| #include "GrUserStencilSettings.h" |
| #include "SkClipOpPriv.h" |
| |
| typedef SkClipStack::Element Element; |
| |
| /** |
| * There are plenty of optimizations that could be added here. Maybe flips could be folded into |
| * earlier operations. Or would inserting flips and reversing earlier ops ever be a win? Perhaps |
| * for the case where the bounds are kInsideOut_BoundsType. We could restrict earlier operations |
| * based on later intersect operations, and perhaps remove intersect-rects. We could optionally |
| * take a rect in case the caller knows a bound on what is to be drawn through this clip. |
| */ |
| GrReducedClip::GrReducedClip(const SkClipStack& stack, const SkRect& queryBounds, |
| int maxWindowRectangles) { |
| SkASSERT(!queryBounds.isEmpty()); |
| fHasIBounds = false; |
| |
| if (stack.isWideOpen()) { |
| fInitialState = InitialState::kAllIn; |
| return; |
| } |
| |
| SkClipStack::BoundsType stackBoundsType; |
| SkRect stackBounds; |
| bool iior; |
| stack.getBounds(&stackBounds, &stackBoundsType, &iior); |
| |
| if (GrClip::IsOutsideClip(stackBounds, queryBounds)) { |
| bool insideOut = SkClipStack::kInsideOut_BoundsType == stackBoundsType; |
| fInitialState = insideOut ? InitialState::kAllIn : InitialState::kAllOut; |
| return; |
| } |
| |
| if (iior) { |
| // "Is intersection of rects" means the clip is a single rect indicated by the stack bounds. |
| // This should only be true if aa/non-aa status matches among all elements. |
| SkASSERT(SkClipStack::kNormal_BoundsType == stackBoundsType); |
| SkClipStack::Iter iter(stack, SkClipStack::Iter::kTop_IterStart); |
| if (!iter.prev()->isAA() || GrClip::IsPixelAligned(stackBounds)) { |
| // The clip is a non-aa rect. This is the one spot where we can actually implement the |
| // clip (using fIBounds) rather than just telling the caller what it should be. |
| stackBounds.round(&fIBounds); |
| fHasIBounds = true; |
| fInitialState = fIBounds.isEmpty() ? InitialState::kAllOut : InitialState::kAllIn; |
| return; |
| } |
| if (GrClip::IsInsideClip(stackBounds, queryBounds)) { |
| fInitialState = InitialState::kAllIn; |
| return; |
| } |
| |
| SkRect tightBounds; |
| SkAssertResult(tightBounds.intersect(stackBounds, queryBounds)); |
| fIBounds = GrClip::GetPixelIBounds(tightBounds); |
| if (fIBounds.isEmpty()) { |
| fInitialState = InitialState::kAllOut; |
| return; |
| } |
| fHasIBounds = true; |
| |
| // Implement the clip with an AA rect element. |
| fElements.addToHead(stackBounds, kReplace_SkClipOp, true/*doAA*/); |
| fElementsGenID = stack.getTopmostGenID(); |
| fRequiresAA = true; |
| |
| fInitialState = InitialState::kAllOut; |
| return; |
| } |
| |
| SkRect tighterQuery = queryBounds; |
| if (SkClipStack::kNormal_BoundsType == stackBoundsType) { |
| // Tighten the query by introducing a new clip at the stack's pixel boundaries. (This new |
| // clip will be enforced by the scissor through fIBounds.) |
| SkAssertResult(tighterQuery.intersect(GrClip::GetPixelBounds(stackBounds))); |
| } |
| |
| fIBounds = GrClip::GetPixelIBounds(tighterQuery); |
| if (fIBounds.isEmpty()) { |
| fInitialState = InitialState::kAllOut; |
| return; |
| } |
| fHasIBounds = true; |
| |
| // Now that we have determined the bounds to use and filtered out the trivial cases, call the |
| // helper that actually walks the stack. |
| this->walkStack(stack, tighterQuery, maxWindowRectangles); |
| |
| if (fWindowRects.count() < maxWindowRectangles) { |
| this->addInteriorWindowRectangles(maxWindowRectangles); |
| } |
| } |
| |
| void GrReducedClip::walkStack(const SkClipStack& stack, const SkRect& queryBounds, |
| int maxWindowRectangles) { |
| // walk backwards until we get to: |
| // a) the beginning |
| // b) an operation that is known to make the bounds all inside/outside |
| // c) a replace operation |
| |
| enum class InitialTriState { |
| kUnknown = -1, |
| kAllIn = (int)GrReducedClip::InitialState::kAllIn, |
| kAllOut = (int)GrReducedClip::InitialState::kAllOut |
| } initialTriState = InitialTriState::kUnknown; |
| |
| // During our backwards walk, track whether we've seen ops that either grow or shrink the clip. |
| // TODO: track these per saved clip so that we can consider them on the forward pass. |
| bool embiggens = false; |
| bool emsmallens = false; |
| |
| // We use a slightly relaxed set of query bounds for element containment tests. This is to |
| // account for floating point rounding error that may have occurred during coord transforms. |
| SkRect relaxedQueryBounds = queryBounds.makeInset(GrClip::kBoundsTolerance, |
| GrClip::kBoundsTolerance); |
| |
| SkClipStack::Iter iter(stack, SkClipStack::Iter::kTop_IterStart); |
| int numAAElements = 0; |
| while (InitialTriState::kUnknown == initialTriState) { |
| const Element* element = iter.prev(); |
| if (nullptr == element) { |
| initialTriState = InitialTriState::kAllIn; |
| break; |
| } |
| if (SkClipStack::kEmptyGenID == element->getGenID()) { |
| initialTriState = InitialTriState::kAllOut; |
| break; |
| } |
| if (SkClipStack::kWideOpenGenID == element->getGenID()) { |
| initialTriState = InitialTriState::kAllIn; |
| break; |
| } |
| |
| bool skippable = false; |
| bool isFlip = false; // does this op just flip the in/out state of every point in the bounds |
| |
| switch (element->getOp()) { |
| case kDifference_SkClipOp: |
| // check if the shape subtracted either contains the entire bounds (and makes |
| // the clip empty) or is outside the bounds and therefore can be skipped. |
| if (element->isInverseFilled()) { |
| if (element->contains(relaxedQueryBounds)) { |
| skippable = true; |
| } else if (GrClip::IsOutsideClip(element->getBounds(), queryBounds)) { |
| initialTriState = InitialTriState::kAllOut; |
| skippable = true; |
| } |
| } else { |
| if (element->contains(relaxedQueryBounds)) { |
| initialTriState = InitialTriState::kAllOut; |
| skippable = true; |
| } else if (GrClip::IsOutsideClip(element->getBounds(), queryBounds)) { |
| skippable = true; |
| } else if (fWindowRects.count() < maxWindowRectangles && !embiggens && |
| !element->isAA() && Element::kRect_Type == element->getType()) { |
| this->addWindowRectangle(element->getRect(), false); |
| skippable = true; |
| } |
| } |
| if (!skippable) { |
| emsmallens = true; |
| } |
| break; |
| case kIntersect_SkClipOp: |
| // check if the shape intersected contains the entire bounds and therefore can |
| // be skipped or it is outside the entire bounds and therefore makes the clip |
| // empty. |
| if (element->isInverseFilled()) { |
| if (element->contains(relaxedQueryBounds)) { |
| initialTriState = InitialTriState::kAllOut; |
| skippable = true; |
| } else if (GrClip::IsOutsideClip(element->getBounds(), queryBounds)) { |
| skippable = true; |
| } |
| } else { |
| if (element->contains(relaxedQueryBounds)) { |
| skippable = true; |
| } else if (GrClip::IsOutsideClip(element->getBounds(), queryBounds)) { |
| initialTriState = InitialTriState::kAllOut; |
| skippable = true; |
| } else if (!embiggens && !element->isAA() && |
| Element::kRect_Type == element->getType()) { |
| // fIBounds and queryBounds have already acccounted for this element via |
| // clip stack bounds; here we just apply the non-aa rounding effect. |
| SkIRect nonaaRect; |
| element->getRect().round(&nonaaRect); |
| if (!this->intersectIBounds(nonaaRect)) { |
| return; |
| } |
| skippable = true; |
| } |
| } |
| if (!skippable) { |
| emsmallens = true; |
| } |
| break; |
| case kUnion_SkClipOp: |
| // If the union-ed shape contains the entire bounds then after this element |
| // the bounds is entirely inside the clip. If the union-ed shape is outside the |
| // bounds then this op can be skipped. |
| if (element->isInverseFilled()) { |
| if (element->contains(relaxedQueryBounds)) { |
| skippable = true; |
| } else if (GrClip::IsOutsideClip(element->getBounds(), queryBounds)) { |
| initialTriState = InitialTriState::kAllIn; |
| skippable = true; |
| } |
| } else { |
| if (element->contains(relaxedQueryBounds)) { |
| initialTriState = InitialTriState::kAllIn; |
| skippable = true; |
| } else if (GrClip::IsOutsideClip(element->getBounds(), queryBounds)) { |
| skippable = true; |
| } |
| } |
| if (!skippable) { |
| embiggens = true; |
| } |
| break; |
| case kXOR_SkClipOp: |
| // If the bounds is entirely inside the shape being xor-ed then the effect is |
| // to flip the inside/outside state of every point in the bounds. We may be |
| // able to take advantage of this in the forward pass. If the xor-ed shape |
| // doesn't intersect the bounds then it can be skipped. |
| if (element->isInverseFilled()) { |
| if (element->contains(relaxedQueryBounds)) { |
| skippable = true; |
| } else if (GrClip::IsOutsideClip(element->getBounds(), queryBounds)) { |
| isFlip = true; |
| } |
| } else { |
| if (element->contains(relaxedQueryBounds)) { |
| isFlip = true; |
| } else if (GrClip::IsOutsideClip(element->getBounds(), queryBounds)) { |
| skippable = true; |
| } |
| } |
| if (!skippable) { |
| emsmallens = embiggens = true; |
| } |
| break; |
| case kReverseDifference_SkClipOp: |
| // When the bounds is entirely within the rev-diff shape then this behaves like xor |
| // and reverses every point inside the bounds. If the shape is completely outside |
| // the bounds then we know after this element is applied that the bounds will be |
| // all outside the current clip.B |
| if (element->isInverseFilled()) { |
| if (element->contains(relaxedQueryBounds)) { |
| initialTriState = InitialTriState::kAllOut; |
| skippable = true; |
| } else if (GrClip::IsOutsideClip(element->getBounds(), queryBounds)) { |
| isFlip = true; |
| } |
| } else { |
| if (element->contains(relaxedQueryBounds)) { |
| isFlip = true; |
| } else if (GrClip::IsOutsideClip(element->getBounds(), queryBounds)) { |
| initialTriState = InitialTriState::kAllOut; |
| skippable = true; |
| } |
| } |
| if (!skippable) { |
| emsmallens = embiggens = true; |
| } |
| break; |
| |
| case kReplace_SkClipOp: |
| // Replace will always terminate our walk. We will either begin the forward walk |
| // at the replace op or detect here than the shape is either completely inside |
| // or completely outside the bounds. In this latter case it can be skipped by |
| // setting the correct value for initialTriState. |
| if (element->isInverseFilled()) { |
| if (element->contains(relaxedQueryBounds)) { |
| initialTriState = InitialTriState::kAllOut; |
| skippable = true; |
| } else if (GrClip::IsOutsideClip(element->getBounds(), queryBounds)) { |
| initialTriState = InitialTriState::kAllIn; |
| skippable = true; |
| } |
| } else { |
| if (element->contains(relaxedQueryBounds)) { |
| initialTriState = InitialTriState::kAllIn; |
| skippable = true; |
| } else if (GrClip::IsOutsideClip(element->getBounds(), queryBounds)) { |
| initialTriState = InitialTriState::kAllOut; |
| skippable = true; |
| } else if (!embiggens && !element->isAA() && |
| Element::kRect_Type == element->getType()) { |
| // fIBounds and queryBounds have already acccounted for this element via |
| // clip stack bounds; here we just apply the non-aa rounding effect. |
| SkIRect nonaaRect; |
| element->getRect().round(&nonaaRect); |
| if (!this->intersectIBounds(nonaaRect)) { |
| return; |
| } |
| initialTriState = InitialTriState::kAllIn; |
| skippable = true; |
| } |
| } |
| if (!skippable) { |
| initialTriState = InitialTriState::kAllOut; |
| embiggens = emsmallens = true; |
| } |
| break; |
| default: |
| SkDEBUGFAIL("Unexpected op."); |
| break; |
| } |
| if (!skippable) { |
| if (0 == fElements.count()) { |
| // This will be the last element. Record the stricter genID. |
| fElementsGenID = element->getGenID(); |
| } |
| |
| // if it is a flip, change it to a bounds-filling rect |
| if (isFlip) { |
| SkASSERT(kXOR_SkClipOp == element->getOp() || |
| kReverseDifference_SkClipOp == element->getOp()); |
| fElements.addToHead(SkRect::Make(fIBounds), kReverseDifference_SkClipOp, false); |
| } else { |
| Element* newElement = fElements.addToHead(*element); |
| if (newElement->isAA()) { |
| ++numAAElements; |
| } |
| // Intersecting an inverse shape is the same as differencing the non-inverse shape. |
| // Replacing with an inverse shape is the same as setting initialState=kAllIn and |
| // differencing the non-inverse shape. |
| bool isReplace = kReplace_SkClipOp == newElement->getOp(); |
| if (newElement->isInverseFilled() && |
| (kIntersect_SkClipOp == newElement->getOp() || isReplace)) { |
| newElement->invertShapeFillType(); |
| newElement->setOp(kDifference_SkClipOp); |
| if (isReplace) { |
| SkASSERT(InitialTriState::kAllOut == initialTriState); |
| initialTriState = InitialTriState::kAllIn; |
| } |
| } |
| } |
| } |
| } |
| |
| if ((InitialTriState::kAllOut == initialTriState && !embiggens) || |
| (InitialTriState::kAllIn == initialTriState && !emsmallens)) { |
| fElements.reset(); |
| numAAElements = 0; |
| } else { |
| Element* element = fElements.headIter().get(); |
| while (element) { |
| bool skippable = false; |
| switch (element->getOp()) { |
| case kDifference_SkClipOp: |
| // subtracting from the empty set yields the empty set. |
| skippable = InitialTriState::kAllOut == initialTriState; |
| break; |
| case kIntersect_SkClipOp: |
| // intersecting with the empty set yields the empty set |
| if (InitialTriState::kAllOut == initialTriState) { |
| skippable = true; |
| } else { |
| // We can clear to zero and then simply draw the clip element. |
| initialTriState = InitialTriState::kAllOut; |
| element->setOp(kReplace_SkClipOp); |
| } |
| break; |
| case kUnion_SkClipOp: |
| if (InitialTriState::kAllIn == initialTriState) { |
| // unioning the infinite plane with anything is a no-op. |
| skippable = true; |
| } else { |
| // unioning the empty set with a shape is the shape. |
| element->setOp(kReplace_SkClipOp); |
| } |
| break; |
| case kXOR_SkClipOp: |
| if (InitialTriState::kAllOut == initialTriState) { |
| // xor could be changed to diff in the kAllIn case, not sure it's a win. |
| element->setOp(kReplace_SkClipOp); |
| } |
| break; |
| case kReverseDifference_SkClipOp: |
| if (InitialTriState::kAllIn == initialTriState) { |
| // subtracting the whole plane will yield the empty set. |
| skippable = true; |
| initialTriState = InitialTriState::kAllOut; |
| } else { |
| // this picks up flips inserted in the backwards pass. |
| skippable = element->isInverseFilled() ? |
| GrClip::IsOutsideClip(element->getBounds(), queryBounds) : |
| element->contains(relaxedQueryBounds); |
| if (skippable) { |
| initialTriState = InitialTriState::kAllIn; |
| } else { |
| element->setOp(kReplace_SkClipOp); |
| } |
| } |
| break; |
| case kReplace_SkClipOp: |
| skippable = false; // we would have skipped it in the backwards walk if we |
| // could've. |
| break; |
| default: |
| SkDEBUGFAIL("Unexpected op."); |
| break; |
| } |
| if (!skippable) { |
| break; |
| } else { |
| if (element->isAA()) { |
| --numAAElements; |
| } |
| fElements.popHead(); |
| element = fElements.headIter().get(); |
| } |
| } |
| } |
| fRequiresAA = numAAElements > 0; |
| |
| SkASSERT(InitialTriState::kUnknown != initialTriState); |
| fInitialState = static_cast<GrReducedClip::InitialState>(initialTriState); |
| } |
| |
| static bool element_is_pure_subtract(SkClipOp op) { |
| SkASSERT(static_cast<int>(op) >= 0); |
| return static_cast<int>(op) <= static_cast<int>(kIntersect_SkClipOp); |
| |
| GR_STATIC_ASSERT(0 == static_cast<int>(kDifference_SkClipOp)); |
| GR_STATIC_ASSERT(1 == static_cast<int>(kIntersect_SkClipOp)); |
| } |
| |
| void GrReducedClip::addInteriorWindowRectangles(int maxWindowRectangles) { |
| SkASSERT(fWindowRects.count() < maxWindowRectangles); |
| // Walk backwards through the element list and add window rectangles to the interiors of |
| // "difference" elements. Quit if we encounter an element that may grow the clip. |
| ElementList::Iter iter(fElements, ElementList::Iter::kTail_IterStart); |
| for (; iter.get() && element_is_pure_subtract(iter.get()->getOp()); iter.prev()) { |
| const Element* element = iter.get(); |
| if (kDifference_SkClipOp != element->getOp()) { |
| continue; |
| } |
| |
| if (Element::kRect_Type == element->getType()) { |
| SkASSERT(element->isAA()); |
| this->addWindowRectangle(element->getRect(), true); |
| if (fWindowRects.count() >= maxWindowRectangles) { |
| return; |
| } |
| continue; |
| } |
| |
| if (Element::kRRect_Type == element->getType()) { |
| // For round rects we add two overlapping windows in the shape of a plus. |
| const SkRRect& clipRRect = element->getRRect(); |
| SkVector insetTL = clipRRect.radii(SkRRect::kUpperLeft_Corner); |
| SkVector insetBR = clipRRect.radii(SkRRect::kLowerRight_Corner); |
| if (SkRRect::kComplex_Type == clipRRect.getType()) { |
| const SkVector& insetTR = clipRRect.radii(SkRRect::kUpperRight_Corner); |
| const SkVector& insetBL = clipRRect.radii(SkRRect::kLowerLeft_Corner); |
| insetTL.fX = SkTMax(insetTL.x(), insetBL.x()); |
| insetTL.fY = SkTMax(insetTL.y(), insetTR.y()); |
| insetBR.fX = SkTMax(insetBR.x(), insetTR.x()); |
| insetBR.fY = SkTMax(insetBR.y(), insetBL.y()); |
| } |
| const SkRect& bounds = clipRRect.getBounds(); |
| if (insetTL.x() + insetBR.x() >= bounds.width() || |
| insetTL.y() + insetBR.y() >= bounds.height()) { |
| continue; // The interior "plus" is empty. |
| } |
| |
| SkRect horzRect = SkRect::MakeLTRB(bounds.left(), bounds.top() + insetTL.y(), |
| bounds.right(), bounds.bottom() - insetBR.y()); |
| this->addWindowRectangle(horzRect, element->isAA()); |
| if (fWindowRects.count() >= maxWindowRectangles) { |
| return; |
| } |
| |
| SkRect vertRect = SkRect::MakeLTRB(bounds.left() + insetTL.x(), bounds.top(), |
| bounds.right() - insetBR.x(), bounds.bottom()); |
| this->addWindowRectangle(vertRect, element->isAA()); |
| if (fWindowRects.count() >= maxWindowRectangles) { |
| return; |
| } |
| continue; |
| } |
| } |
| } |
| |
| inline void GrReducedClip::addWindowRectangle(const SkRect& elementInteriorRect, bool elementIsAA) { |
| SkIRect window; |
| if (!elementIsAA) { |
| elementInteriorRect.round(&window); |
| } else { |
| elementInteriorRect.roundIn(&window); |
| } |
| if (!window.isEmpty()) { // Skip very thin windows that round to zero or negative dimensions. |
| fWindowRects.addWindow(window); |
| } |
| } |
| |
| inline bool GrReducedClip::intersectIBounds(const SkIRect& irect) { |
| SkASSERT(fHasIBounds); |
| if (!fIBounds.intersect(irect)) { |
| fHasIBounds = false; |
| fWindowRects.reset(); |
| fElements.reset(); |
| fRequiresAA = false; |
| fInitialState = InitialState::kAllOut; |
| return false; |
| } |
| return true; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // Create a 8-bit clip mask in alpha |
| |
| static bool stencil_element(GrRenderTargetContext* rtc, |
| const GrFixedClip& clip, |
| const GrUserStencilSettings* ss, |
| const SkMatrix& viewMatrix, |
| const SkClipStack::Element* element) { |
| GrAA aa = GrBoolToAA(element->isAA()); |
| switch (element->getType()) { |
| case Element::kEmpty_Type: |
| SkDEBUGFAIL("Should never get here with an empty element."); |
| break; |
| case Element::kRect_Type: |
| return rtc->priv().drawAndStencilRect(clip, ss, |
| (SkRegion::Op)element->getOp(), |
| element->isInverseFilled(), aa, viewMatrix, |
| element->getRect()); |
| break; |
| default: { |
| SkPath path; |
| element->asPath(&path); |
| if (path.isInverseFillType()) { |
| path.toggleInverseFillType(); |
| } |
| |
| return rtc->priv().drawAndStencilPath(clip, ss, (SkRegion::Op)element->getOp(), |
| element->isInverseFilled(), aa, viewMatrix, path); |
| break; |
| } |
| } |
| |
| return false; |
| } |
| |
| static void draw_element(GrRenderTargetContext* rtc, |
| const GrClip& clip, // TODO: can this just always be WideOpen? |
| GrPaint&& paint, |
| GrAA aa, |
| 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: |
| rtc->drawRect(clip, std::move(paint), aa, viewMatrix, element->getRect()); |
| break; |
| default: { |
| SkPath path; |
| element->asPath(&path); |
| if (path.isInverseFillType()) { |
| path.toggleInverseFillType(); |
| } |
| |
| rtc->drawPath(clip, std::move(paint), aa, viewMatrix, path, GrStyle::SimpleFill()); |
| break; |
| } |
| } |
| } |
| |
| bool GrReducedClip::drawAlphaClipMask(GrRenderTargetContext* rtc) const { |
| // The texture may be larger than necessary, this rect represents the part of the texture |
| // we populate with a rasterization of the clip. |
| GrFixedClip clip(SkIRect::MakeWH(fIBounds.width(), fIBounds.height())); |
| |
| if (!fWindowRects.empty()) { |
| clip.setWindowRectangles(fWindowRects.makeOffset(-fIBounds.left(), -fIBounds.top()), |
| GrWindowRectsState::Mode::kExclusive); |
| } |
| |
| // The scratch texture that we are drawing into can be substantially larger than the mask. Only |
| // clear the part that we care about. |
| GrColor initialCoverage = InitialState::kAllIn == this->initialState() ? -1 : 0; |
| rtc->priv().clear(clip, initialCoverage, true); |
| |
| // Set the matrix so that rendered clip elements are transformed to mask space from clip space. |
| SkMatrix translate; |
| translate.setTranslate(SkIntToScalar(-fIBounds.left()), SkIntToScalar(-fIBounds.top())); |
| |
| // walk through each clip element and perform its set op |
| for (ElementList::Iter iter(fElements); iter.get(); iter.next()) { |
| const Element* element = iter.get(); |
| SkRegion::Op op = (SkRegion::Op)element->getOp(); |
| GrAA aa = GrBoolToAA(element->isAA()); |
| bool invert = element->isInverseFilled(); |
| if (invert || SkRegion::kIntersect_Op == op || SkRegion::kReverseDifference_Op == op) { |
| // 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(rtc, clip, &kStencilInElement, translate, element)) { |
| return false; |
| } |
| |
| // 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 (!rtc->priv().drawAndStencilRect(clip, &kDrawOutsideElement, op, !invert, GrAA::kNo, |
| translate, SkRect::Make(fIBounds))) { |
| return false; |
| } |
| } else { |
| // all the remaining ops can just be directly draw into the accumulation buffer |
| GrPaint paint; |
| paint.setCoverageSetOpXPFactory(op, false); |
| |
| draw_element(rtc, clip, std::move(paint), aa, translate, element); |
| } |
| } |
| |
| return true; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // Create a 1-bit clip mask in the stencil buffer. |
| |
| class StencilClip final : public GrClip { |
| public: |
| StencilClip(const SkIRect& scissorRect, uint32_t clipStackID) |
| : fFixedClip(scissorRect) |
| , fClipStackID(clipStackID) { |
| } |
| |
| const GrFixedClip& fixedClip() const { return fFixedClip; } |
| |
| void setWindowRectangles(const GrWindowRectangles& windows, GrWindowRectsState::Mode mode) { |
| fFixedClip.setWindowRectangles(windows, mode); |
| } |
| |
| private: |
| bool quickContains(const SkRect&) const override { |
| return false; |
| } |
| void getConservativeBounds(int width, int height, SkIRect* bounds, bool* iior) const override { |
| fFixedClip.getConservativeBounds(width, height, bounds, iior); |
| } |
| bool isRRect(const SkRect& rtBounds, SkRRect* rr, GrAA*) const override { |
| return false; |
| } |
| bool apply(GrContext* context, GrRenderTargetContext* renderTargetContext, bool useHWAA, |
| bool hasUserStencilSettings, GrAppliedClip* out, SkRect* bounds) const override { |
| if (!fFixedClip.apply(context, renderTargetContext, useHWAA, hasUserStencilSettings, out, |
| bounds)) { |
| return false; |
| } |
| out->addStencilClip(fClipStackID); |
| return true; |
| } |
| |
| GrFixedClip fFixedClip; |
| uint32_t fClipStackID; |
| |
| typedef GrClip INHERITED; |
| }; |
| |
| bool GrReducedClip::drawStencilClipMask(GrContext* context, |
| GrRenderTargetContext* renderTargetContext) const { |
| // We set the current clip to the bounds so that our recursive draws are scissored to them. |
| StencilClip stencilClip(fIBounds, this->elementsGenID()); |
| |
| if (!fWindowRects.empty()) { |
| stencilClip.setWindowRectangles(fWindowRects, GrWindowRectsState::Mode::kExclusive); |
| } |
| |
| bool initialState = InitialState::kAllIn == this->initialState(); |
| renderTargetContext->priv().clearStencilClip(stencilClip.fixedClip(), initialState); |
| |
| // walk through each clip element and perform its set op with the existing clip. |
| for (ElementList::Iter iter(fElements); iter.get(); iter.next()) { |
| const Element* element = iter.get(); |
| GrAAType aaType = GrAAType::kNone; |
| if (element->isAA() && GrFSAAType::kNone != renderTargetContext->fsaaType()) { |
| aaType = GrAAType::kMSAA; |
| } |
| |
| bool fillInverted = 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 = (SkRegion::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(); |
| } |
| |
| GrShape shape(clipPath, GrStyle::SimpleFill()); |
| GrPathRenderer::CanDrawPathArgs canDrawArgs; |
| canDrawArgs.fCaps = context->caps(); |
| canDrawArgs.fViewMatrix = &SkMatrix::I(); |
| canDrawArgs.fShape = &shape; |
| canDrawArgs.fAAType = aaType; |
| canDrawArgs.fHasUserStencilSettings = false; |
| |
| GrDrawingManager* dm = context->contextPriv().drawingManager(); |
| pr = dm->getPathRenderer(canDrawArgs, false, GrPathRendererChain::DrawType::kStencil, |
| &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()) { |
| renderTargetContext->priv().stencilRect(stencilClip.fixedClip(), &kDrawToStencil, |
| aaType, SkMatrix::I(), element->getRect()); |
| } else { |
| if (!clipPath.isEmpty()) { |
| GrShape shape(clipPath, GrStyle::SimpleFill()); |
| if (canRenderDirectToStencil) { |
| GrPaint paint; |
| paint.setXPFactory(GrDisableColorXPFactory::Get()); |
| |
| GrPathRenderer::DrawPathArgs args{context, |
| std::move(paint), |
| &kDrawToStencil, |
| renderTargetContext, |
| &stencilClip.fixedClip(), |
| &SkMatrix::I(), |
| &shape, |
| aaType, |
| false}; |
| pr->drawPath(args); |
| } else { |
| GrPathRenderer::StencilPathArgs args; |
| args.fContext = context; |
| args.fRenderTargetContext = renderTargetContext; |
| args.fClip = &stencilClip.fixedClip(); |
| args.fViewMatrix = &SkMatrix::I(); |
| args.fAAType = aaType; |
| args.fShape = &shape; |
| pr->stencilPath(args); |
| } |
| } |
| } |
| } |
| |
| // now we modify the clip bit by rendering either the clip |
| // element directly or a bounding rect of the entire clip. |
| for (GrUserStencilSettings const* const* pass = stencilPasses; *pass; ++pass) { |
| if (drawDirectToClip) { |
| if (Element::kRect_Type == element->getType()) { |
| renderTargetContext->priv().stencilRect(stencilClip, *pass, aaType, |
| SkMatrix::I(), element->getRect()); |
| } else { |
| GrShape shape(clipPath, GrStyle::SimpleFill()); |
| GrPaint paint; |
| paint.setXPFactory(GrDisableColorXPFactory::Get()); |
| GrPathRenderer::DrawPathArgs args{context, |
| std::move(paint), |
| *pass, |
| renderTargetContext, |
| &stencilClip, |
| &SkMatrix::I(), |
| &shape, |
| aaType, |
| false}; |
| pr->drawPath(args); |
| } |
| } else { |
| // The view matrix is setup to do clip space -> stencil space translation, so |
| // draw rect in clip space. |
| renderTargetContext->priv().stencilRect(stencilClip, *pass, aaType, SkMatrix::I(), |
| SkRect::Make(fIBounds)); |
| } |
| } |
| } |
| return true; |
| } |
