1
2/*
3 * Copyright 2011 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8#ifndef SkProxyCanvas_DEFINED
9#define SkProxyCanvas_DEFINED
10
11#include "SkCanvas.h"
12
13/** This class overrides all virtual methods on SkCanvas, and redirects them
14    to a "proxy", another SkCanvas instance. It can be the basis for
15    intercepting (and possibly modifying) calls to a canvas.
16
17    There must be a proxy installed before the proxycanvas can be used (i.e.
18    before its virtual methods can be called).
19 */
20class SK_API SkProxyCanvas : public SkCanvas {
21public:
22    SkProxyCanvas() : fProxy(NULL) {}
23    SkProxyCanvas(SkCanvas* proxy);
24    virtual ~SkProxyCanvas();
25
26    SkCanvas*   getProxy() const { return fProxy; }
27    void        setProxy(SkCanvas* proxy);
28
29    virtual int save(SaveFlags flags = kMatrixClip_SaveFlag) SK_OVERRIDE;
30    virtual int saveLayer(const SkRect* bounds, const SkPaint* paint,
31                          SaveFlags flags = kARGB_ClipLayer_SaveFlag) SK_OVERRIDE;
32    virtual void restore() SK_OVERRIDE;
33
34    virtual bool translate(SkScalar dx, SkScalar dy) SK_OVERRIDE;
35    virtual bool scale(SkScalar sx, SkScalar sy) SK_OVERRIDE;
36    virtual bool rotate(SkScalar degrees) SK_OVERRIDE;
37    virtual bool skew(SkScalar sx, SkScalar sy) SK_OVERRIDE;
38    virtual bool concat(const SkMatrix& matrix) SK_OVERRIDE;
39    virtual void setMatrix(const SkMatrix& matrix) SK_OVERRIDE;
40
41    virtual bool clipRect(const SkRect&, SkRegion::Op, bool) SK_OVERRIDE;
42    virtual bool clipRRect(const SkRRect&, SkRegion::Op, bool) SK_OVERRIDE;
43    virtual bool clipPath(const SkPath&, SkRegion::Op, bool) SK_OVERRIDE;
44    virtual bool clipRegion(const SkRegion& deviceRgn,
45                            SkRegion::Op op = SkRegion::kIntersect_Op) SK_OVERRIDE;
46
47    virtual void drawPaint(const SkPaint& paint) SK_OVERRIDE;
48    virtual void drawPoints(PointMode mode, size_t count, const SkPoint pts[],
49                            const SkPaint& paint) SK_OVERRIDE;
50    virtual void drawOval(const SkRect&, const SkPaint& paint) SK_OVERRIDE;
51    virtual void drawRect(const SkRect&, const SkPaint& paint) SK_OVERRIDE;
52    virtual void drawRRect(const SkRRect&, const SkPaint& paint) SK_OVERRIDE;
53    virtual void drawPath(const SkPath& path, const SkPaint& paint) SK_OVERRIDE;
54    virtual void drawBitmap(const SkBitmap& bitmap, SkScalar left, SkScalar top,
55                            const SkPaint* paint = NULL) SK_OVERRIDE;
56    virtual void drawBitmapRectToRect(const SkBitmap& bitmap, const SkRect* src,
57                                const SkRect& dst, const SkPaint* paint = NULL) SK_OVERRIDE;
58    virtual void drawBitmapMatrix(const SkBitmap& bitmap, const SkMatrix& m,
59                                  const SkPaint* paint = NULL) SK_OVERRIDE;
60    virtual void drawSprite(const SkBitmap& bitmap, int left, int top,
61                            const SkPaint* paint = NULL) SK_OVERRIDE;
62    virtual void drawText(const void* text, size_t byteLength, SkScalar x,
63                          SkScalar y, const SkPaint& paint) SK_OVERRIDE;
64    virtual void drawPosText(const void* text, size_t byteLength,
65                             const SkPoint pos[], const SkPaint& paint) SK_OVERRIDE;
66    virtual void drawPosTextH(const void* text, size_t byteLength,
67                              const SkScalar xpos[], SkScalar constY,
68                              const SkPaint& paint) SK_OVERRIDE;
69    virtual void drawTextOnPath(const void* text, size_t byteLength,
70                                const SkPath& path, const SkMatrix* matrix,
71                                const SkPaint& paint) SK_OVERRIDE;
72    virtual void drawPicture(SkPicture&) SK_OVERRIDE;
73    virtual void drawVertices(VertexMode vmode, int vertexCount,
74                              const SkPoint vertices[], const SkPoint texs[],
75                              const SkColor colors[], SkXfermode* xmode,
76                              const uint16_t indices[], int indexCount,
77                              const SkPaint& paint) SK_OVERRIDE;
78    virtual void drawData(const void* data, size_t length) SK_OVERRIDE;
79
80    virtual void beginCommentGroup(const char* description) SK_OVERRIDE;
81    virtual void addComment(const char* kywd, const char* value) SK_OVERRIDE;
82    virtual void endCommentGroup() SK_OVERRIDE;
83
84    virtual SkBounder* setBounder(SkBounder* bounder) SK_OVERRIDE;
85    virtual SkDrawFilter* setDrawFilter(SkDrawFilter* filter) SK_OVERRIDE;
86
87private:
88    SkCanvas*   fProxy;
89
90    typedef SkCanvas INHERITED;
91};
92
93#endif
94