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Side by Side Diff: skia/ext/canvas_paint_x.h

Issue 10009024: Remove WAYLAND port (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: sync Created 8 years, 8 months ago
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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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