1// Copyright (c) 2013 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef SKIA_EXT_ANALYSIS_CANVAS_H_
6#define SKIA_EXT_ANALYSIS_CANVAS_H_
7
8#include "base/compiler_specific.h"
9#include "third_party/skia/include/core/SkCanvas.h"
10#include "third_party/skia/include/core/SkPicture.h"
11
12namespace skia {
13
14// Does not render anything, but gathers statistics about a region
15// (specified as a clip rectangle) of an SkPicture as the picture is
16// played back through it.
17// To use: play a picture into the canvas, and then check result.
18class SK_API AnalysisCanvas : public SkCanvas, public SkDrawPictureCallback {
19 public:
20  AnalysisCanvas(int width, int height);
21  virtual ~AnalysisCanvas();
22
23  // Returns true when a SkColor can be used to represent result.
24  bool GetColorIfSolid(SkColor* color) const;
25  bool HasText() const;
26
27  void SetForceNotSolid(bool flag);
28  void SetForceNotTransparent(bool flag);
29
30  // SkDrawPictureCallback override.
31  virtual bool abortDrawing() OVERRIDE;
32
33  // SkCanvas overrides.
34  virtual void clear(SkColor) OVERRIDE;
35  virtual void drawPaint(const SkPaint& paint) OVERRIDE;
36  virtual void drawPoints(PointMode,
37                          size_t count,
38                          const SkPoint pts[],
39                          const SkPaint&) OVERRIDE;
40  virtual void drawOval(const SkRect&, const SkPaint&) OVERRIDE;
41  virtual void drawRect(const SkRect&, const SkPaint&) OVERRIDE;
42  virtual void drawRRect(const SkRRect&, const SkPaint&) OVERRIDE;
43  virtual void drawPath(const SkPath& path, const SkPaint&) OVERRIDE;
44  virtual void drawBitmap(const SkBitmap&,
45                          SkScalar left,
46                          SkScalar top,
47                          const SkPaint* paint = NULL) OVERRIDE;
48  virtual void drawBitmapRectToRect(const SkBitmap&,
49                                    const SkRect* src,
50                                    const SkRect& dst,
51                                    const SkPaint* paint,
52                                    DrawBitmapRectFlags flags) OVERRIDE;
53  virtual void drawBitmapMatrix(const SkBitmap&,
54                                const SkMatrix&,
55                                const SkPaint* paint = NULL) OVERRIDE;
56  virtual void drawBitmapNine(const SkBitmap& bitmap,
57                              const SkIRect& center,
58                              const SkRect& dst,
59                              const SkPaint* paint = NULL) OVERRIDE;
60  virtual void drawSprite(const SkBitmap&, int left, int top,
61                          const SkPaint* paint = NULL) OVERRIDE;
62  virtual void drawVertices(VertexMode,
63                            int vertexCount,
64                            const SkPoint vertices[],
65                            const SkPoint texs[],
66                            const SkColor colors[],
67                            SkXfermode*,
68                            const uint16_t indices[],
69                            int indexCount,
70                            const SkPaint&) OVERRIDE;
71
72 protected:
73  virtual void willSave() OVERRIDE;
74  virtual SaveLayerStrategy willSaveLayer(const SkRect*,
75                                          const SkPaint*,
76                                          SaveFlags) OVERRIDE;
77  virtual void willRestore() OVERRIDE;
78
79  virtual void onClipRect(const SkRect& rect,
80                          SkRegion::Op op,
81                          ClipEdgeStyle edge_style) OVERRIDE;
82  virtual void onClipRRect(const SkRRect& rrect,
83                           SkRegion::Op op,
84                           ClipEdgeStyle edge_style) OVERRIDE;
85  virtual void onClipPath(const SkPath& path,
86                          SkRegion::Op op,
87                          ClipEdgeStyle edge_style) OVERRIDE;
88
89  virtual void onDrawText(const void* text,
90                          size_t byteLength,
91                          SkScalar x,
92                          SkScalar y,
93                          const SkPaint&) OVERRIDE;
94  virtual void onDrawPosText(const void* text,
95                             size_t byteLength,
96                             const SkPoint pos[],
97                             const SkPaint&) OVERRIDE;
98  virtual void onDrawPosTextH(const void* text,
99                              size_t byteLength,
100                              const SkScalar xpos[],
101                              SkScalar constY,
102                              const SkPaint&) OVERRIDE;
103  virtual void onDrawTextOnPath(const void* text,
104                                size_t byteLength,
105                                const SkPath& path,
106                                const SkMatrix* matrix,
107                                const SkPaint&) OVERRIDE;
108  virtual void onDrawDRRect(const SkRRect& outer,
109                            const SkRRect& inner,
110                            const SkPaint&) OVERRIDE;
111
112private:
113  typedef SkCanvas INHERITED;
114
115  int saved_stack_size_;
116  int force_not_solid_stack_level_;
117  int force_not_transparent_stack_level_;
118
119  bool is_forced_not_solid_;
120  bool is_forced_not_transparent_;
121  bool is_solid_color_;
122  SkColor color_;
123  bool is_transparent_;
124  bool has_text_;
125};
126
127}  // namespace skia
128
129#endif  // SKIA_EXT_ANALYSIS_CANVAS_H_
130
131