/*
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* Copyright 2013 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkCanvasStack_DEFINED
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#define SkCanvasStack_DEFINED
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#include "SkNWayCanvas.h"
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#include "SkRegion.h"
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#include "SkTArray.h"
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/**
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* Like NWayCanvas, in that it forwards all canvas methods to each sub-canvas that is "pushed".
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*
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* Unlike NWayCanvas, this takes ownership of each subcanvas, and deletes them when this canvas
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* is deleted.
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*/
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class SkCanvasStack : public SkNWayCanvas {
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public:
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SkCanvasStack(int width, int height);
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~SkCanvasStack() override;
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void pushCanvas(std::unique_ptr<SkCanvas>, const SkIPoint& origin);
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void removeAll() override;
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/*
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* The following add/remove canvas methods are overrides from SkNWayCanvas
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* that do not make sense in the context of our CanvasStack, but since we
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* can share most of the other implementation of NWay we override those
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* methods to be no-ops.
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*/
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void addCanvas(SkCanvas*) override { SkDEBUGFAIL("Invalid Op"); }
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void removeCanvas(SkCanvas*) override { SkDEBUGFAIL("Invalid Op"); }
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protected:
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void didSetMatrix(const SkMatrix&) override;
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void onClipRect(const SkRect&, SkClipOp, ClipEdgeStyle) override;
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void onClipRRect(const SkRRect&, SkClipOp, ClipEdgeStyle) override;
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void onClipPath(const SkPath&, SkClipOp, ClipEdgeStyle) override;
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void onClipRegion(const SkRegion&, SkClipOp) override;
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private:
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void clipToZOrderedBounds();
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struct CanvasData {
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SkIPoint origin;
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SkRegion requiredClip;
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std::unique_ptr<SkCanvas> ownedCanvas;
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};
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SkTArray<CanvasData> fCanvasData;
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typedef SkNWayCanvas INHERITED;
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};
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#endif
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