| /* |
| * Copyright 2013 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| #include "SkCanvasStack.h" |
| |
| SkCanvasStack::SkCanvasStack(int width, int height) |
| : INHERITED(width, height) {} |
| |
| SkCanvasStack::~SkCanvasStack() { |
| this->removeAll(); |
| } |
| |
| void SkCanvasStack::pushCanvas(std::unique_ptr<SkCanvas> canvas, const SkIPoint& origin) { |
| if (canvas) { |
| // compute the bounds of this canvas |
| const SkIRect canvasBounds = SkIRect::MakeSize(canvas->getDeviceSize()); |
| |
| // push the canvas onto the stack |
| this->INHERITED::addCanvas(canvas.get()); |
| |
| // push the canvas data onto the stack |
| CanvasData* data = &fCanvasData.push_back(); |
| data->origin = origin; |
| data->requiredClip.setRect(canvasBounds); |
| data->ownedCanvas = std::move(canvas); |
| |
| // subtract this region from the canvas objects already on the stack. |
| // This ensures they do not draw into the space occupied by the layers |
| // above them. |
| for (int i = fList.count() - 1; i > 0; --i) { |
| SkIRect localBounds = canvasBounds; |
| localBounds.offset(origin - fCanvasData[i-1].origin); |
| |
| fCanvasData[i-1].requiredClip.op(localBounds, SkRegion::kDifference_Op); |
| fList[i-1]->clipRegion(fCanvasData[i-1].requiredClip); |
| } |
| } |
| SkASSERT(fList.count() == fCanvasData.count()); |
| } |
| |
| void SkCanvasStack::removeAll() { |
| this->INHERITED::removeAll(); // call the baseclass *before* we actually delete the canvases |
| fCanvasData.reset(); |
| } |
| |
| /** |
| * Traverse all canvases (e.g. layers) the stack and ensure that they are clipped |
| * to their bounds and that the area covered by any canvas higher in the stack is |
| * also clipped out. |
| */ |
| void SkCanvasStack::clipToZOrderedBounds() { |
| SkASSERT(fList.count() == fCanvasData.count()); |
| for (int i = 0; i < fList.count(); ++i) { |
| fList[i]->clipRegion(fCanvasData[i].requiredClip); |
| } |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| /** |
| * We need to handle setMatrix specially as it overwrites the matrix in each |
| * canvas unlike all other matrix operations (i.e. translate, scale, etc) which |
| * just pre-concatenate with the existing matrix. |
| */ |
| void SkCanvasStack::didSetMatrix(const SkMatrix& matrix) { |
| SkASSERT(fList.count() == fCanvasData.count()); |
| for (int i = 0; i < fList.count(); ++i) { |
| |
| SkMatrix tempMatrix = matrix; |
| tempMatrix.postTranslate(SkIntToScalar(-fCanvasData[i].origin.x()), |
| SkIntToScalar(-fCanvasData[i].origin.y())); |
| fList[i]->setMatrix(tempMatrix); |
| } |
| this->SkCanvas::didSetMatrix(matrix); |
| } |
| |
| void SkCanvasStack::onClipRect(const SkRect& r, SkClipOp op, ClipEdgeStyle edgeStyle) { |
| this->INHERITED::onClipRect(r, op, edgeStyle); |
| this->clipToZOrderedBounds(); |
| } |
| |
| void SkCanvasStack::onClipRRect(const SkRRect& rr, SkClipOp op, ClipEdgeStyle edgeStyle) { |
| this->INHERITED::onClipRRect(rr, op, edgeStyle); |
| this->clipToZOrderedBounds(); |
| } |
| |
| void SkCanvasStack::onClipPath(const SkPath& p, SkClipOp op, ClipEdgeStyle edgeStyle) { |
| this->INHERITED::onClipPath(p, op, edgeStyle); |
| this->clipToZOrderedBounds(); |
| } |
| |
| void SkCanvasStack::onClipRegion(const SkRegion& deviceRgn, SkClipOp op) { |
| SkASSERT(fList.count() == fCanvasData.count()); |
| for (int i = 0; i < fList.count(); ++i) { |
| SkRegion tempRegion; |
| deviceRgn.translate(-fCanvasData[i].origin.x(), |
| -fCanvasData[i].origin.y(), &tempRegion); |
| tempRegion.op(fCanvasData[i].requiredClip, SkRegion::kIntersect_Op); |
| fList[i]->clipRegion(tempRegion, op); |
| } |
| this->SkCanvas::onClipRegion(deviceRgn, op); |
| } |