| /* |
| * Copyright 2010 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "SkRasterClip.h" |
| #include "SkPath.h" |
| |
| enum MutateResult { |
| kDoNothing_MutateResult, |
| kReplaceClippedAgainstGlobalBounds_MutateResult, |
| kContinue_MutateResult, |
| }; |
| |
| static MutateResult mutate_conservative_op(SkRegion::Op* op, bool inverseFilled) { |
| if (inverseFilled) { |
| switch (*op) { |
| case SkRegion::kIntersect_Op: |
| case SkRegion::kDifference_Op: |
| // These ops can only shrink the current clip. So leaving |
| // the clip unchanged conservatively respects the contract. |
| return kDoNothing_MutateResult; |
| case SkRegion::kUnion_Op: |
| case SkRegion::kReplace_Op: |
| case SkRegion::kReverseDifference_Op: |
| case SkRegion::kXOR_Op: { |
| // These ops can grow the current clip up to the extents of |
| // the input clip, which is inverse filled, so we just set |
| // the current clip to the device bounds. |
| *op = SkRegion::kReplace_Op; |
| return kReplaceClippedAgainstGlobalBounds_MutateResult; |
| } |
| } |
| } else { |
| // Not inverse filled |
| switch (*op) { |
| case SkRegion::kIntersect_Op: |
| case SkRegion::kUnion_Op: |
| case SkRegion::kReplace_Op: |
| return kContinue_MutateResult; |
| case SkRegion::kDifference_Op: |
| // Difference can only shrink the current clip. |
| // Leaving clip unchanged conservatively fullfills the contract. |
| return kDoNothing_MutateResult; |
| case SkRegion::kReverseDifference_Op: |
| // To reverse, we swap in the bounds with a replace op. |
| // As with difference, leave it unchanged. |
| *op = SkRegion::kReplace_Op; |
| return kContinue_MutateResult; |
| case SkRegion::kXOR_Op: |
| // Be conservative, based on (A XOR B) always included in (A union B), |
| // which is always included in (bounds(A) union bounds(B)) |
| *op = SkRegion::kUnion_Op; |
| return kContinue_MutateResult; |
| } |
| } |
| SkASSERT(false); // unknown op |
| return kDoNothing_MutateResult; |
| } |
| |
| void SkConservativeClip::opRect(const SkRect& localRect, const SkMatrix& ctm, |
| const SkIRect& devBounds, SkRegion::Op op, bool doAA) { |
| SkIRect ir; |
| switch (mutate_conservative_op(&op, false)) { |
| case kDoNothing_MutateResult: |
| return; |
| case kReplaceClippedAgainstGlobalBounds_MutateResult: |
| ir = devBounds; |
| break; |
| case kContinue_MutateResult: { |
| SkRect devRect; |
| ctm.mapRect(&devRect, localRect); |
| ir = doAA ? devRect.roundOut() : devRect.round(); |
| } break; |
| } |
| this->opIRect(ir, op); |
| } |
| |
| void SkConservativeClip::opRRect(const SkRRect& rrect, const SkMatrix& ctm, |
| const SkIRect& devBounds, SkRegion::Op op, bool doAA) { |
| this->opRect(rrect.getBounds(), ctm, devBounds, op, doAA); |
| } |
| |
| void SkConservativeClip::opPath(const SkPath& path, const SkMatrix& ctm, const SkIRect& devBounds, |
| SkRegion::Op op, bool doAA) { |
| SkIRect ir; |
| switch (mutate_conservative_op(&op, path.isInverseFillType())) { |
| case kDoNothing_MutateResult: |
| return; |
| case kReplaceClippedAgainstGlobalBounds_MutateResult: |
| ir = devBounds; |
| break; |
| case kContinue_MutateResult: { |
| SkRect bounds = path.getBounds(); |
| ctm.mapRect(&bounds); |
| ir = bounds.roundOut(); |
| break; |
| } |
| } |
| return this->opIRect(ir, op); |
| } |
| |
| void SkConservativeClip::opRegion(const SkRegion& rgn, SkRegion::Op op) { |
| this->opIRect(rgn.getBounds(), op); |
| } |
| |
| void SkConservativeClip::opIRect(const SkIRect& devRect, SkRegion::Op op) { |
| if (SkRegion::kIntersect_Op == op) { |
| if (!fBounds.intersect(devRect)) { |
| fBounds.setEmpty(); |
| } |
| return; |
| } |
| |
| // This may still create a complex region (which we would then take the bounds |
| // Perhaps we should inline the op-logic directly to never create the rgn... |
| SkRegion result; |
| result.op(SkRegion(fBounds), SkRegion(devRect), op); |
| fBounds = result.getBounds(); |
| this->applyClipRestriction(op, &fBounds); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| SkRasterClip::SkRasterClip(const SkRasterClip& src) { |
| AUTO_RASTERCLIP_VALIDATE(src); |
| |
| fIsBW = src.fIsBW; |
| if (fIsBW) { |
| fBW = src.fBW; |
| } else { |
| fAA = src.fAA; |
| } |
| |
| fIsEmpty = src.isEmpty(); |
| fIsRect = src.isRect(); |
| fClipRestrictionRect = src.fClipRestrictionRect; |
| SkDEBUGCODE(this->validate();) |
| } |
| |
| SkRasterClip::SkRasterClip(const SkRegion& rgn) : fBW(rgn) { |
| fIsBW = true; |
| fIsEmpty = this->computeIsEmpty(); // bounds might be empty, so compute |
| fIsRect = !fIsEmpty; |
| SkDEBUGCODE(this->validate();) |
| } |
| |
| SkRasterClip::SkRasterClip(const SkIRect& bounds) : fBW(bounds) { |
| fIsBW = true; |
| fIsEmpty = this->computeIsEmpty(); // bounds might be empty, so compute |
| fIsRect = !fIsEmpty; |
| SkDEBUGCODE(this->validate();) |
| } |
| |
| SkRasterClip::SkRasterClip() { |
| fIsBW = true; |
| fIsEmpty = true; |
| fIsRect = false; |
| SkDEBUGCODE(this->validate();) |
| } |
| |
| SkRasterClip::~SkRasterClip() { |
| SkDEBUGCODE(this->validate();) |
| } |
| |
| bool SkRasterClip::operator==(const SkRasterClip& other) const { |
| if (fIsBW != other.fIsBW) { |
| return false; |
| } |
| bool isEqual = fIsBW ? fBW == other.fBW : fAA == other.fAA; |
| #ifdef SK_DEBUG |
| if (isEqual) { |
| SkASSERT(fIsEmpty == other.fIsEmpty); |
| SkASSERT(fIsRect == other.fIsRect); |
| } |
| #endif |
| return isEqual; |
| } |
| |
| bool SkRasterClip::isComplex() const { |
| return fIsBW ? fBW.isComplex() : !fAA.isEmpty(); |
| } |
| |
| const SkIRect& SkRasterClip::getBounds() const { |
| return fIsBW ? fBW.getBounds() : fAA.getBounds(); |
| } |
| |
| bool SkRasterClip::setEmpty() { |
| AUTO_RASTERCLIP_VALIDATE(*this); |
| |
| fIsBW = true; |
| fBW.setEmpty(); |
| fAA.setEmpty(); |
| fIsEmpty = true; |
| fIsRect = false; |
| return false; |
| } |
| |
| bool SkRasterClip::setRect(const SkIRect& rect) { |
| AUTO_RASTERCLIP_VALIDATE(*this); |
| |
| fIsBW = true; |
| fAA.setEmpty(); |
| fIsRect = fBW.setRect(rect); |
| fIsEmpty = !fIsRect; |
| return fIsRect; |
| } |
| |
| ///////////////////////////////////////////////////////////////////////////////////// |
| |
| bool SkRasterClip::setConservativeRect(const SkRect& r, const SkIRect& clipR, bool isInverse) { |
| SkRegion::Op op; |
| if (isInverse) { |
| op = SkRegion::kDifference_Op; |
| } else { |
| op = SkRegion::kIntersect_Op; |
| } |
| fBW.setRect(clipR); |
| fBW.op(r.roundOut(), op); |
| return this->updateCacheAndReturnNonEmpty(); |
| } |
| |
| ///////////////////////////////////////////////////////////////////////////////////// |
| |
| bool SkRasterClip::setPath(const SkPath& path, const SkRegion& clip, bool doAA) { |
| AUTO_RASTERCLIP_VALIDATE(*this); |
| |
| if (this->isBW() && !doAA) { |
| (void)fBW.setPath(path, clip); |
| } else { |
| // TODO: since we are going to over-write fAA completely (aren't we?) |
| // we should just clear our BW data (if any) and set fIsAA=true |
| if (this->isBW()) { |
| this->convertToAA(); |
| } |
| (void)fAA.setPath(path, &clip, doAA); |
| } |
| return this->updateCacheAndReturnNonEmpty(); |
| } |
| |
| bool SkRasterClip::op(const SkRRect& rrect, const SkMatrix& matrix, const SkIRect& devBounds, |
| SkRegion::Op op, bool doAA) { |
| SkIRect bounds(devBounds); |
| this->applyClipRestriction(op, &bounds); |
| |
| SkPath path; |
| path.addRRect(rrect); |
| |
| return this->op(path, matrix, bounds, op, doAA); |
| } |
| |
| bool SkRasterClip::op(const SkPath& path, const SkMatrix& matrix, const SkIRect& devBounds, |
| SkRegion::Op op, bool doAA) { |
| AUTO_RASTERCLIP_VALIDATE(*this); |
| SkIRect bounds(devBounds); |
| this->applyClipRestriction(op, &bounds); |
| |
| // base is used to limit the size (and therefore memory allocation) of the |
| // region that results from scan converting devPath. |
| SkRegion base; |
| |
| SkPath devPath; |
| if (matrix.isIdentity()) { |
| devPath = path; |
| } else { |
| path.transform(matrix, &devPath); |
| devPath.setIsVolatile(true); |
| } |
| if (SkRegion::kIntersect_Op == op) { |
| // since we are intersect, we can do better (tighter) with currRgn's |
| // bounds, than just using the device. However, if currRgn is complex, |
| // our region blitter may hork, so we do that case in two steps. |
| if (this->isRect()) { |
| // FIXME: we should also be able to do this when this->isBW(), |
| // but relaxing the test above triggers GM asserts in |
| // SkRgnBuilder::blitH(). We need to investigate what's going on. |
| return this->setPath(devPath, this->bwRgn(), doAA); |
| } else { |
| base.setRect(this->getBounds()); |
| SkRasterClip clip; |
| clip.setPath(devPath, base, doAA); |
| return this->op(clip, op); |
| } |
| } else { |
| base.setRect(bounds); |
| |
| if (SkRegion::kReplace_Op == op) { |
| return this->setPath(devPath, base, doAA); |
| } else { |
| SkRasterClip clip; |
| clip.setPath(devPath, base, doAA); |
| return this->op(clip, op); |
| } |
| } |
| } |
| |
| bool SkRasterClip::setPath(const SkPath& path, const SkIRect& clip, bool doAA) { |
| SkRegion tmp; |
| tmp.setRect(clip); |
| return this->setPath(path, tmp, doAA); |
| } |
| |
| bool SkRasterClip::op(const SkIRect& rect, SkRegion::Op op) { |
| AUTO_RASTERCLIP_VALIDATE(*this); |
| |
| fIsBW ? fBW.op(rect, op) : fAA.op(rect, op); |
| return this->updateCacheAndReturnNonEmpty(); |
| } |
| |
| bool SkRasterClip::op(const SkRegion& rgn, SkRegion::Op op) { |
| AUTO_RASTERCLIP_VALIDATE(*this); |
| |
| if (fIsBW) { |
| (void)fBW.op(rgn, op); |
| } else { |
| SkAAClip tmp; |
| tmp.setRegion(rgn); |
| (void)fAA.op(tmp, op); |
| } |
| return this->updateCacheAndReturnNonEmpty(); |
| } |
| |
| bool SkRasterClip::op(const SkRasterClip& clip, SkRegion::Op op) { |
| AUTO_RASTERCLIP_VALIDATE(*this); |
| clip.validate(); |
| |
| if (this->isBW() && clip.isBW()) { |
| (void)fBW.op(clip.fBW, op); |
| } else { |
| SkAAClip tmp; |
| const SkAAClip* other; |
| |
| if (this->isBW()) { |
| this->convertToAA(); |
| } |
| if (clip.isBW()) { |
| tmp.setRegion(clip.bwRgn()); |
| other = &tmp; |
| } else { |
| other = &clip.aaRgn(); |
| } |
| (void)fAA.op(*other, op); |
| } |
| return this->updateCacheAndReturnNonEmpty(); |
| } |
| |
| /** |
| * Our antialiasing currently has a granularity of 1/4 of a pixel along each |
| * axis. Thus we can treat an axis coordinate as an integer if it differs |
| * from its nearest int by < half of that value (1.8 in this case). |
| */ |
| static bool nearly_integral(SkScalar x) { |
| static const SkScalar domain = SK_Scalar1 / 4; |
| static const SkScalar halfDomain = domain / 2; |
| |
| x += halfDomain; |
| return x - SkScalarFloorToScalar(x) < domain; |
| } |
| |
| bool SkRasterClip::op(const SkRect& localRect, const SkMatrix& matrix, const SkIRect& devBounds, |
| SkRegion::Op op, bool doAA) { |
| AUTO_RASTERCLIP_VALIDATE(*this); |
| SkRect devRect; |
| |
| const bool isScaleTrans = matrix.isScaleTranslate(); |
| if (!isScaleTrans) { |
| SkPath path; |
| path.addRect(localRect); |
| path.setIsVolatile(true); |
| return this->op(path, matrix, devBounds, op, doAA); |
| } |
| |
| matrix.mapRect(&devRect, localRect); |
| |
| if (fIsBW && doAA) { |
| // check that the rect really needs aa, or is it close enought to |
| // integer boundaries that we can just treat it as a BW rect? |
| if (nearly_integral(devRect.fLeft) && nearly_integral(devRect.fTop) && |
| nearly_integral(devRect.fRight) && nearly_integral(devRect.fBottom)) { |
| doAA = false; |
| } |
| } |
| |
| if (fIsBW && !doAA) { |
| SkIRect ir; |
| devRect.round(&ir); |
| this->applyClipRestriction(op, &ir); |
| (void)fBW.op(ir, op); |
| } else { |
| if (fIsBW) { |
| this->convertToAA(); |
| } |
| this->applyClipRestriction(op, &devRect); |
| (void)fAA.op(devRect, op, doAA); |
| } |
| return this->updateCacheAndReturnNonEmpty(); |
| } |
| |
| void SkRasterClip::translate(int dx, int dy, SkRasterClip* dst) const { |
| if (nullptr == dst) { |
| return; |
| } |
| |
| AUTO_RASTERCLIP_VALIDATE(*this); |
| |
| if (this->isEmpty()) { |
| dst->setEmpty(); |
| return; |
| } |
| if (0 == (dx | dy)) { |
| *dst = *this; |
| return; |
| } |
| |
| dst->fIsBW = fIsBW; |
| if (fIsBW) { |
| fBW.translate(dx, dy, &dst->fBW); |
| dst->fAA.setEmpty(); |
| } else { |
| fAA.translate(dx, dy, &dst->fAA); |
| dst->fBW.setEmpty(); |
| } |
| dst->updateCacheAndReturnNonEmpty(); |
| } |
| |
| bool SkRasterClip::quickContains(const SkIRect& ir) const { |
| return fIsBW ? fBW.quickContains(ir) : fAA.quickContains(ir); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| const SkRegion& SkRasterClip::forceGetBW() { |
| AUTO_RASTERCLIP_VALIDATE(*this); |
| |
| if (!fIsBW) { |
| fBW.setRect(fAA.getBounds()); |
| } |
| return fBW; |
| } |
| |
| void SkRasterClip::convertToAA() { |
| AUTO_RASTERCLIP_VALIDATE(*this); |
| |
| SkASSERT(fIsBW); |
| fAA.setRegion(fBW); |
| fIsBW = false; |
| |
| // since we are being explicitly asked to convert-to-aa, we pass false so we don't "optimize" |
| // ourselves back to BW. |
| (void)this->updateCacheAndReturnNonEmpty(false); |
| } |
| |
| #ifdef SK_DEBUG |
| void SkRasterClip::validate() const { |
| // can't ever assert that fBW is empty, since we may have called forceGetBW |
| if (fIsBW) { |
| SkASSERT(fAA.isEmpty()); |
| } |
| |
| fBW.validate(); |
| fAA.validate(); |
| |
| SkASSERT(this->computeIsEmpty() == fIsEmpty); |
| SkASSERT(this->computeIsRect() == fIsRect); |
| } |
| #endif |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| SkAAClipBlitterWrapper::SkAAClipBlitterWrapper() { |
| SkDEBUGCODE(fClipRgn = nullptr;) |
| SkDEBUGCODE(fBlitter = nullptr;) |
| } |
| |
| SkAAClipBlitterWrapper::SkAAClipBlitterWrapper(const SkRasterClip& clip, |
| SkBlitter* blitter) { |
| this->init(clip, blitter); |
| } |
| |
| SkAAClipBlitterWrapper::SkAAClipBlitterWrapper(const SkAAClip* aaclip, |
| SkBlitter* blitter) { |
| SkASSERT(blitter); |
| SkASSERT(aaclip); |
| fBWRgn.setRect(aaclip->getBounds()); |
| fAABlitter.init(blitter, aaclip); |
| // now our return values |
| fClipRgn = &fBWRgn; |
| fBlitter = &fAABlitter; |
| } |
| |
| void SkAAClipBlitterWrapper::init(const SkRasterClip& clip, SkBlitter* blitter) { |
| SkASSERT(blitter); |
| if (clip.isBW()) { |
| fClipRgn = &clip.bwRgn(); |
| fBlitter = blitter; |
| } else { |
| const SkAAClip& aaclip = clip.aaRgn(); |
| fBWRgn.setRect(aaclip.getBounds()); |
| fAABlitter.init(blitter, &aaclip); |
| // now our return values |
| fClipRgn = &fBWRgn; |
| fBlitter = &fAABlitter; |
| } |
| } |