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| 1 | |
| 2 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | |
| 3 // Use of this source code is governed by a BSD-style license that can be | |
| 4 // found in the LICENSE file. | |
| 5 | |
| 6 #ifndef UI_GFX_CANVAS_PAINT_LINUX_H_ | |
| 7 #define UI_GFX_CANVAS_PAINT_LINUX_H_ | |
| 8 | |
| 9 #include "base/logging.h" | |
| 10 #include "skia/ext/platform_canvas.h" | |
| 11 #include "ui/gfx/canvas.h" | |
| 12 #include <gdk/gdk.h> | |
| 13 | |
| 14 namespace gfx { | |
| 15 | |
| 16 // A class designed to translate skia painting into a region in a GdkWindow. | |
| 17 // On construction, it will set up a context for painting into, and on | |
| 18 // destruction, it will commit it to the GdkWindow. | |
| 19 // Note: The created context is always inialized to (0, 0, 0, 0). | |
| 20 class GFX_EXPORT CanvasSkiaPaint : public Canvas { | |
| 21 public: | |
| 22 // This constructor assumes the result is opaque. | |
| 23 explicit CanvasSkiaPaint(GdkEventExpose* event); | |
| 24 CanvasSkiaPaint(GdkEventExpose* event, bool opaque); | |
| 25 virtual ~CanvasSkiaPaint(); | |
| 26 | |
| 27 // Sets whether the bitmap is composited in such a way that the alpha channel | |
| 28 // is honored. This is only useful if you've enabled an RGBA colormap on the | |
| 29 // widget. The default is false. | |
| 30 void set_composite_alpha(bool composite_alpha) { | |
| 31 composite_alpha_ = composite_alpha; | |
| 32 } | |
| 33 | |
| 34 // Returns true if the invalid region is empty. The caller should call this | |
| 35 // function to determine if anything needs painting. | |
| 36 bool is_empty() const { | |
| 37 return gdk_region_empty(region_); | |
| 38 } | |
| 39 | |
| 40 GdkRectangle rectangle() const { | |
| 41 GdkRectangle bounds; | |
| 42 gdk_region_get_clipbox(region_, &bounds); | |
| 43 return bounds; | |
| 44 } | |
| 45 | |
| 46 private: | |
| 47 void Init(bool opaque); | |
| 48 | |
| 49 cairo_t* context_; | |
| 50 GdkWindow* window_; | |
| 51 GdkRegion* region_; | |
| 52 // See description above setter. | |
| 53 bool composite_alpha_; | |
| 54 | |
| 55 // Disallow copy and assign. | |
| 56 CanvasSkiaPaint(const CanvasSkiaPaint&); | |
| 57 CanvasSkiaPaint& operator=(const CanvasSkiaPaint&); | |
| 58 }; | |
| 59 | |
| 60 // A class designed to translate skia painting into a region in a Cairo context. | |
| 61 // On construction, it will set up a context for painting into, and on | |
| 62 // destruction, it will commit it to the Cairo context. If there are any | |
| 63 // transformations applied to the Cairo context, they will affect the drawing. | |
| 64 class GFX_EXPORT CanvasSkiaPaintCairo : public Canvas { | |
| 65 public: | |
| 66 CanvasSkiaPaintCairo(cairo_t* cairo, Size size, bool opaque); | |
| 67 virtual ~CanvasSkiaPaintCairo(); | |
| 68 | |
| 69 // Sets whether the bitmap is composited in such a way that the alpha channel | |
| 70 // is honored. This is only useful if you've enabled an RGBA colormap on the | |
| 71 // widget. The default is false. | |
| 72 void set_composite_alpha(bool composite_alpha) { | |
| 73 composite_alpha_ = composite_alpha; | |
| 74 } | |
| 75 | |
| 76 // Returns true if size of the drawing region is empty. The caller should call | |
| 77 // this function to determine if anything needs painting. | |
| 78 bool is_empty() const { | |
| 79 return size_.IsEmpty(); | |
| 80 } | |
| 81 | |
| 82 Size size() const { | |
| 83 return size_; | |
| 84 } | |
| 85 | |
| 86 private: | |
| 87 void Init(bool opaque); | |
| 88 | |
| 89 cairo_t* context_; | |
| 90 cairo_t* dest_; | |
| 91 Size size_; | |
| 92 // See description above setter. | |
| 93 bool composite_alpha_; | |
| 94 | |
| 95 // Disallow copy and assign. | |
| 96 CanvasSkiaPaintCairo(const CanvasSkiaPaintCairo&); | |
| 97 CanvasSkiaPaintCairo& operator=(const CanvasSkiaPaintCairo&); | |
| 98 }; | |
| 99 | |
| 100 } // namespace gfx | |
| 101 | |
| 102 #endif // UI_GFX_CANVAS_PAINT_LINUX_H_ | |
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