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| 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 | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #ifndef SKIA_EXT_CANVAS_PAINT_WAYLAND_H_ | |
| 6 #define SKIA_EXT_CANVAS_PAINT_WAYLAND_H_ | |
| 7 #pragma once | |
| 8 | |
| 9 #include "base/logging.h" | |
| 10 #include "skia/ext/canvas_paint_common.h" | |
| 11 #include "skia/ext/platform_canvas.h" | |
| 12 | |
| 13 #include <cairo/cairo.h> | |
| 14 | |
| 15 namespace skia { | |
| 16 | |
| 17 // A class designed to translate skia painting into a region in a Wayland window | |
| 18 // surface. On construction, it will set up a context for painting into, and on | |
| 19 // destruction, it will commit it to the Wayland window surface. | |
| 20 // Note: The created context is always inialized to (0, 0, 0, 0). | |
| 21 template <class T> | |
| 22 class CanvasPaintT : public T { | |
| 23 public: | |
| 24 // This constructor assumes the result is opaque. | |
| 25 CanvasPaintT(cairo_surface_t* cairo_window_surface, | |
| 26 cairo_rectangle_t* region) | |
| 27 : context_(NULL), | |
| 28 cairo_window_surface_(cairo_window_surface), | |
| 29 region_(region), | |
| 30 composite_alpha_(false) { | |
| 31 init(true); | |
| 32 } | |
| 33 | |
| 34 CanvasPaintT(cairo_surface_t* cairo_window_surface, | |
| 35 cairo_rectangle_t* region, | |
| 36 bool opaque) | |
| 37 : context_(NULL), | |
| 38 cairo_window_surface_(cairo_window_surface), | |
| 39 region_(region), | |
| 40 composite_alpha_(false) { | |
| 41 init(opaque); | |
| 42 } | |
| 43 | |
| 44 virtual ~CanvasPaintT() { | |
| 45 if (!is_empty()) { | |
| 46 PlatformCanvas* canvas = GetPlatformCanvas(this); | |
| 47 canvas->restoreToCount(1); | |
| 48 | |
| 49 // Blit the dirty rect to the window. | |
| 50 CHECK(cairo_window_surface_); | |
| 51 cairo_t* cr = cairo_create(cairo_window_surface_); | |
| 52 CHECK(cr); | |
| 53 | |
| 54 if (composite_alpha_) | |
| 55 cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE); | |
| 56 | |
| 57 cairo_surface_t* source_surface = cairo_get_target(context_); | |
| 58 CHECK(source_surface); | |
| 59 // Flush cairo's cache of the surface. | |
| 60 cairo_surface_mark_dirty(source_surface); | |
| 61 cairo_set_source_surface(cr, source_surface, region_->x, region_->y); | |
| 62 cairo_rectangle(cr, | |
| 63 region_->x, | |
| 64 region_->y, | |
| 65 region_->width, | |
| 66 region_->height); | |
| 67 cairo_fill(cr); | |
| 68 cairo_destroy(cr); | |
| 69 } | |
| 70 } | |
| 71 | |
| 72 // Sets whether the bitmap is composited in such a way that the alpha channel | |
| 73 // is honored. This is only useful if you've enabled an RGBA colormap on the | |
| 74 // widget. The default is false. | |
| 75 void set_composite_alpha(bool composite_alpha) { | |
| 76 composite_alpha_ = composite_alpha; | |
| 77 } | |
| 78 | |
| 79 // Returns true if the invalid region is empty. The caller should call this | |
| 80 // function to determine if anything needs painting. | |
| 81 bool is_empty() const { | |
| 82 return region_->width == 0 && region_->height == 0; | |
| 83 } | |
| 84 | |
| 85 private: | |
| 86 void init(bool opaque) { | |
| 87 PlatformCanvas* canvas = GetPlatformCanvas(this); | |
| 88 if (!canvas->initialize(region_->width, region_->height, opaque, NULL)) { | |
| 89 // Cause a deliberate crash; | |
| 90 CHECK(false); | |
| 91 } | |
| 92 // No need to clear the canvas, because cairo automatically performs the | |
| 93 // clear. | |
| 94 | |
| 95 // Need to translate so that the dirty region appears at the origin of the | |
| 96 // surface. | |
| 97 canvas->translate(-SkDoubleToScalar(region_->x), | |
| 98 -SkDoubleToScalar(region_->y)); | |
| 99 | |
| 100 context_ = BeginPlatformPaint(canvas); | |
| 101 } | |
| 102 | |
| 103 cairo_t* context_; | |
| 104 cairo_surface_t* cairo_window_surface_; | |
| 105 cairo_rectangle_t* region_; | |
| 106 // See description above setter. | |
| 107 bool composite_alpha_; | |
| 108 | |
| 109 // Disallow copy and assign. | |
| 110 CanvasPaintT(const CanvasPaintT&); | |
| 111 CanvasPaintT& operator=(const CanvasPaintT&); | |
| 112 }; | |
| 113 | |
| 114 typedef CanvasPaintT<PlatformCanvas> PlatformCanvasPaint; | |
| 115 | |
| 116 } // namespace skia | |
| 117 | |
| 118 #endif // SKIA_EXT_CANVAS_PAINT_WAYLAND_H_ | |
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