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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.
*/
#ifndef SkCanvasStack_DEFINED
#define SkCanvasStack_DEFINED
#include "SkNWayCanvas.h"
#include "SkRegion.h"
#include "SkTArray.h"
/**
* Like NWayCanvas, in that it forwards all canvas methods to each sub-canvas that is "pushed".
*
* Unlike NWayCanvas, this takes ownership of each subcanvas, and deletes them when this canvas
* is deleted.
*/
class SkCanvasStack : public SkNWayCanvas {
public:
SkCanvasStack(int width, int height);
~SkCanvasStack() override;
void pushCanvas(std::unique_ptr<SkCanvas>, const SkIPoint& origin);
void removeAll() override;
/*
* The following add/remove canvas methods are overrides from SkNWayCanvas
* that do not make sense in the context of our CanvasStack, but since we
* can share most of the other implementation of NWay we override those
* methods to be no-ops.
*/
void addCanvas(SkCanvas*) override { SkDEBUGFAIL("Invalid Op"); }
void removeCanvas(SkCanvas*) override { SkDEBUGFAIL("Invalid Op"); }
protected:
void didSetMatrix(const SkMatrix&) override;
void onClipRect(const SkRect&, SkClipOp, ClipEdgeStyle) override;
void onClipRRect(const SkRRect&, SkClipOp, ClipEdgeStyle) override;
void onClipPath(const SkPath&, SkClipOp, ClipEdgeStyle) override;
void onClipRegion(const SkRegion&, SkClipOp) override;
private:
void clipToZOrderedBounds();
struct CanvasData {
SkIPoint origin;
SkRegion requiredClip;
std::unique_ptr<SkCanvas> ownedCanvas;
};
SkTArray<CanvasData> fCanvasData;
typedef SkNWayCanvas INHERITED;
};
#endif
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