SkProxyCanvas.h revision ec3ed6a5ebf6f2c406d7bcf94b6bc34fcaeb976e 
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 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    // overrides from SkCanvas
30
31    virtual int save(SaveFlags flags = kMatrixClip_SaveFlag);
32    virtual int saveLayer(const SkRect* bounds, const SkPaint* paint,
33                          SaveFlags flags = kARGB_ClipLayer_SaveFlag);
34    virtual void restore();
35
36    virtual bool translate(SkScalar dx, SkScalar dy);
37    virtual bool scale(SkScalar sx, SkScalar sy);
38    virtual bool rotate(SkScalar degrees);
39    virtual bool skew(SkScalar sx, SkScalar sy);
40    virtual bool concat(const SkMatrix& matrix);
41    virtual void setMatrix(const SkMatrix& matrix);
42
43    virtual bool clipRect(const SkRect& rect,
44                          SkRegion::Op op = SkRegion::kIntersect_Op);
45    virtual bool clipPath(const SkPath& path,
46                          SkRegion::Op op = SkRegion::kIntersect_Op);
47    virtual bool clipRegion(const SkRegion& deviceRgn,
48                            SkRegion::Op op = SkRegion::kIntersect_Op);
49
50    virtual void drawPaint(const SkPaint& paint);
51    virtual void drawPoints(PointMode mode, size_t count, const SkPoint pts[],
52                            const SkPaint& paint);
53    virtual void drawRect(const SkRect& rect, const SkPaint& paint);
54    virtual void drawPath(const SkPath& path, const SkPaint& paint);
55    virtual void drawBitmap(const SkBitmap& bitmap, SkScalar left, SkScalar top,
56                            const SkPaint* paint = NULL);
57    virtual void drawBitmapRect(const SkBitmap& bitmap, const SkIRect* src,
58                                const SkRect& dst, const SkPaint* paint = NULL);
59    virtual void drawBitmapMatrix(const SkBitmap& bitmap, const SkMatrix& m,
60                                  const SkPaint* paint = NULL);
61    virtual void drawSprite(const SkBitmap& bitmap, int left, int top,
62                            const SkPaint* paint = NULL);
63    virtual void drawText(const void* text, size_t byteLength, SkScalar x,
64                          SkScalar y, const SkPaint& paint);
65    virtual void drawPosText(const void* text, size_t byteLength,
66                             const SkPoint pos[], const SkPaint& paint);
67    virtual void drawPosTextH(const void* text, size_t byteLength,
68                              const SkScalar xpos[], SkScalar constY,
69                              const SkPaint& paint);
70    virtual void drawTextOnPath(const void* text, size_t byteLength,
71                                const SkPath& path, const SkMatrix* matrix,
72                                const SkPaint& paint);
73    virtual void drawPicture(SkPicture&);
74    virtual void drawVertices(VertexMode vmode, int vertexCount,
75                              const SkPoint vertices[], const SkPoint texs[],
76                              const SkColor colors[], SkXfermode* xmode,
77                              const uint16_t indices[], int indexCount,
78                              const SkPaint& paint);
79    virtual void drawData(const void* data, size_t length);
80
81    virtual SkBounder* setBounder(SkBounder* bounder);
82    virtual SkDrawFilter* setDrawFilter(SkDrawFilter* filter);
83
84private:
85    SkCanvas*   fProxy;
86
87    typedef SkCanvas INHERITED;
88};
89
90#endif
91