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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef SKIA_EXT_CANVAS_PAINT_WAYLAND_H_ | 5 #ifndef SKIA_EXT_CANVAS_PAINT_WAYLAND_H_ |
6 #define SKIA_EXT_CANVAS_PAINT_WAYLAND_H_ | 6 #define SKIA_EXT_CANVAS_PAINT_WAYLAND_H_ |
7 #pragma once | 7 #pragma once |
8 | 8 |
9 #include "base/logging.h" | 9 #include "base/logging.h" |
10 #include "skia/ext/canvas_paint_common.h" | 10 #include "skia/ext/canvas_paint_common.h" |
11 #include "skia/ext/platform_canvas.h" | 11 #include "skia/ext/platform_canvas.h" |
12 | 12 |
13 namespace skia { | 13 namespace skia { |
14 | 14 |
15 // A class designed to translate skia painting into a region in a Wayland window | 15 // A class designed to translate skia painting into a region in a Wayland window |
16 // surface. On construction, it will set up a context for painting into, and on | 16 // surface. On construction, it will set up a context for painting into, and on |
17 // destruction, it will commit it to the Wayland window surface. | 17 // destruction, it will commit it to the Wayland window surface. |
| 18 // Note: The created context is always inialized to (0, 0, 0, 0). |
18 template <class T> | 19 template <class T> |
19 class CanvasPaintT : public T { | 20 class CanvasPaintT : public T { |
20 public: | 21 public: |
21 // This constructor assumes the result is opaque. | 22 // This constructor assumes the result is opaque. |
22 CanvasPaintT(cairo_surface_t* cairo_window_surface, | 23 CanvasPaintT(cairo_surface_t* cairo_window_surface, |
23 cairo_rectangle_int_t* region) | 24 cairo_rectangle_int_t* region) |
24 : context_(NULL), | 25 : context_(NULL), |
25 cairo_window_surface_(cairo_window_surface), | 26 cairo_window_surface_(cairo_window_surface), |
26 region_(region), | 27 region_(region), |
27 composite_alpha_(false) { | 28 composite_alpha_(false) { |
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79 return region_->width == 0 && region_->height == 0; | 80 return region_->width == 0 && region_->height == 0; |
80 } | 81 } |
81 | 82 |
82 private: | 83 private: |
83 void init(bool opaque) { | 84 void init(bool opaque) { |
84 PlatformCanvas* canvas = GetPlatformCanvas(this); | 85 PlatformCanvas* canvas = GetPlatformCanvas(this); |
85 if (!canvas->initialize(region_->width, region_->height, opaque, NULL)) { | 86 if (!canvas->initialize(region_->width, region_->height, opaque, NULL)) { |
86 // Cause a deliberate crash; | 87 // Cause a deliberate crash; |
87 CHECK(false); | 88 CHECK(false); |
88 } | 89 } |
| 90 // No need to clear the canvas, because cairo automatically performs the |
| 91 // clear. |
89 | 92 |
90 // Need to translate so that the dirty region appears at the origin of the | 93 // Need to translate so that the dirty region appears at the origin of the |
91 // surface. | 94 // surface. |
92 canvas->translate(-SkIntToScalar(region_->x), -SkIntToScalar(region_->y)); | 95 canvas->translate(-SkIntToScalar(region_->x), -SkIntToScalar(region_->y)); |
93 | 96 |
94 context_ = BeginPlatformPaint(canvas); | 97 context_ = BeginPlatformPaint(canvas); |
95 } | 98 } |
96 | 99 |
97 cairo_t* context_; | 100 cairo_t* context_; |
98 cairo_surface_t* cairo_window_surface_; | 101 cairo_surface_t* cairo_window_surface_; |
99 cairo_rectangle_int_t* region_; | 102 cairo_rectangle_int_t* region_; |
100 // See description above setter. | 103 // See description above setter. |
101 bool composite_alpha_; | 104 bool composite_alpha_; |
102 | 105 |
103 // Disallow copy and assign. | 106 // Disallow copy and assign. |
104 CanvasPaintT(const CanvasPaintT&); | 107 CanvasPaintT(const CanvasPaintT&); |
105 CanvasPaintT& operator=(const CanvasPaintT&); | 108 CanvasPaintT& operator=(const CanvasPaintT&); |
106 }; | 109 }; |
107 | 110 |
108 typedef CanvasPaintT<PlatformCanvas> PlatformCanvasPaint; | 111 typedef CanvasPaintT<PlatformCanvas> PlatformCanvasPaint; |
109 | 112 |
110 } // namespace skia | 113 } // namespace skia |
111 | 114 |
112 #endif // SKIA_EXT_CANVAS_PAINT_WAYLAND_H_ | 115 #endif // SKIA_EXT_CANVAS_PAINT_WAYLAND_H_ |
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