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/SkDevice.h" 11 #include "third_party/skia/include/core/SkPicture.h" 12 13 namespace skia { 14 15 class AnalysisDevice; 16 17 // Does not render anything, but gathers statistics about a region 18 // (specified as a clip rectangle) of an SkPicture as the picture is 19 // played back through it. 20 // To use: create a SkBitmap with kNo_Config, create an AnalysisDevice 21 // using that bitmap, and create an AnalysisCanvas using the device. 22 // Play a picture into the canvas, and then check result. 23 class SK_API AnalysisCanvas : public SkCanvas, public SkDrawPictureCallback { 24 public: 25 AnalysisCanvas(AnalysisDevice*); 26 virtual ~AnalysisCanvas(); 27 28 // Returns true when a SkColor can be used to represent result. 29 bool GetColorIfSolid(SkColor* color) const; 30 bool HasText() const; 31 32 // SkDrawPictureCallback override. 33 virtual bool abortDrawing() OVERRIDE; 34 35 // SkCanvas overrides. 36 virtual bool clipRect(const SkRect& rect, 37 SkRegion::Op op = SkRegion::kIntersect_Op, 38 bool do_anti_alias = false) OVERRIDE; 39 virtual bool clipPath(const SkPath& path, 40 SkRegion::Op op = SkRegion::kIntersect_Op, 41 bool do_anti_alias = false) OVERRIDE; 42 virtual bool clipRRect(const SkRRect& rrect, 43 SkRegion::Op op = SkRegion::kIntersect_Op, 44 bool do_anti_alias = false) OVERRIDE; 45 46 virtual int saveLayer(const SkRect* bounds, 47 const SkPaint* paint, 48 SkCanvas::SaveFlags flags) OVERRIDE; 49 virtual int save(SaveFlags flags = kMatrixClip_SaveFlag) OVERRIDE; 50 51 virtual void restore() OVERRIDE; 52 53 private: 54 typedef SkCanvas INHERITED; 55 56 int saved_stack_size_; 57 int force_not_solid_stack_level_; 58 int force_not_transparent_stack_level_; 59 }; 60 61 class SK_API AnalysisDevice : public SkDevice { 62 public: 63 AnalysisDevice(const SkBitmap& bitmap); 64 virtual ~AnalysisDevice(); 65 66 bool GetColorIfSolid(SkColor* color) const; 67 bool HasText() const; 68 69 void SetForceNotSolid(bool flag); 70 void SetForceNotTransparent(bool flag); 71 72 protected: 73 // SkDevice overrides. 74 virtual void clear(SkColor color) OVERRIDE; 75 virtual void drawPaint(const SkDraw& draw, const SkPaint& paint) OVERRIDE; 76 virtual void drawPoints(const SkDraw& draw, 77 SkCanvas::PointMode mode, 78 size_t count, 79 const SkPoint points[], 80 const SkPaint& paint) OVERRIDE; 81 virtual void drawRect(const SkDraw& draw, 82 const SkRect& rect, 83 const SkPaint& paint) OVERRIDE; 84 virtual void drawRRect(const SkDraw& draw, 85 const SkRRect& rr, 86 const SkPaint& paint) OVERRIDE; 87 virtual void drawOval(const SkDraw& draw, 88 const SkRect& oval, 89 const SkPaint& paint) OVERRIDE; 90 virtual void drawPath(const SkDraw& draw, 91 const SkPath& path, 92 const SkPaint& paint, 93 const SkMatrix* pre_path_matrix = NULL, 94 bool path_is_mutable = false) OVERRIDE; 95 virtual void drawBitmap(const SkDraw& draw, 96 const SkBitmap& bitmap, 97 const SkMatrix& matrix, 98 const SkPaint& paint) OVERRIDE; 99 virtual void drawSprite(const SkDraw& draw, 100 const SkBitmap& bitmap, 101 int x, 102 int y, 103 const SkPaint& paint) OVERRIDE; 104 virtual void drawBitmapRect(const SkDraw& draw, 105 const SkBitmap& bitmap, 106 const SkRect* src_or_null, 107 const SkRect& dst, 108 const SkPaint& paint) OVERRIDE; 109 virtual void drawText(const SkDraw& draw, 110 const void* text, 111 size_t len, 112 SkScalar x, 113 SkScalar y, 114 const SkPaint& paint) OVERRIDE; 115 virtual void drawPosText(const SkDraw& draw, 116 const void* text, 117 size_t len, 118 const SkScalar pos[], 119 SkScalar const_y, 120 int scalars_per_pos, 121 const SkPaint& paint) OVERRIDE; 122 virtual void drawTextOnPath(const SkDraw& draw, 123 const void* text, 124 size_t len, 125 const SkPath& path, 126 const SkMatrix* matrix, 127 const SkPaint& paint) OVERRIDE; 128 #ifdef SK_BUILD_FOR_ANDROID 129 virtual void drawPosTextOnPath(const SkDraw& draw, 130 const void* text, 131 size_t len, 132 const SkPoint pos[], 133 const SkPaint& paint, 134 const SkPath& path, 135 const SkMatrix* matrix) OVERRIDE; 136 #endif 137 virtual void drawVertices(const SkDraw& draw, 138 SkCanvas::VertexMode vertex_mode, 139 int vertex_count, 140 const SkPoint verts[], 141 const SkPoint texs[], 142 const SkColor colors[], 143 SkXfermode* xmode, 144 const uint16_t indices[], 145 int index_count, 146 const SkPaint& paint) OVERRIDE; 147 virtual void drawDevice(const SkDraw& draw, 148 SkDevice* device, 149 int x, 150 int y, 151 const SkPaint& paint) OVERRIDE; 152 153 private: 154 typedef SkDevice INHERITED; 155 156 bool is_forced_not_solid_; 157 bool is_forced_not_transparent_; 158 bool is_solid_color_; 159 SkColor color_; 160 bool is_transparent_; 161 bool has_text_; 162 }; 163 164 } // namespace skia 165 166 #endif // SKIA_EXT_ANALYSIS_CANVAS_H_ 167 168
