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- /*
- * 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 "src/utils/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->getBaseLayerSize());
- // 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);
- }
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