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 #include "chrome/browser/ui/gtk/cairo_cached_surface.h"
6
7 #include <gtk/gtk.h>
8
9 #include "base/basictypes.h"
10 #include "base/logging.h"
11
CairoCachedSurface()12 CairoCachedSurface::CairoCachedSurface() : pixbuf_(NULL), surface_(NULL) {
13 }
14
~CairoCachedSurface()15 CairoCachedSurface::~CairoCachedSurface() {
16 if (surface_)
17 cairo_surface_destroy(surface_);
18
19 if (pixbuf_)
20 g_object_unref(pixbuf_);
21 }
22
Width() const23 int CairoCachedSurface::Width() const {
24 return pixbuf_ ? gdk_pixbuf_get_width(pixbuf_) : -1;
25 }
26
Height() const27 int CairoCachedSurface::Height() const {
28 return pixbuf_ ? gdk_pixbuf_get_height(pixbuf_) : -1;
29 }
30
UsePixbuf(GdkPixbuf * pixbuf)31 void CairoCachedSurface::UsePixbuf(GdkPixbuf* pixbuf) {
32 if (surface_) {
33 cairo_surface_destroy(surface_);
34 surface_ = NULL;
35 }
36
37 if (pixbuf)
38 g_object_ref(pixbuf);
39
40 if (pixbuf_)
41 g_object_unref(pixbuf_);
42
43 pixbuf_ = pixbuf;
44 }
45
SetSource(cairo_t * cr,int x,int y)46 void CairoCachedSurface::SetSource(cairo_t* cr, int x, int y) {
47 DCHECK(pixbuf_);
48 DCHECK(cr);
49
50 if (!surface_) {
51 // First time here since last UsePixbuf call. Generate the surface.
52 cairo_surface_t* target = cairo_get_target(cr);
53 surface_ = cairo_surface_create_similar(
54 target,
55 CAIRO_CONTENT_COLOR_ALPHA,
56 gdk_pixbuf_get_width(pixbuf_),
57 gdk_pixbuf_get_height(pixbuf_));
58
59 DCHECK(surface_);
60 #if !defined(NDEBUG)
61 int surface_type = cairo_surface_get_type(surface_);
62 DCHECK(surface_type == CAIRO_SURFACE_TYPE_XLIB ||
63 surface_type == CAIRO_SURFACE_TYPE_XCB ||
64 surface_type == CAIRO_SURFACE_TYPE_IMAGE);
65 #endif
66
67 cairo_t* copy_cr = cairo_create(surface_);
68 gdk_cairo_set_source_pixbuf(copy_cr, pixbuf_, 0, 0);
69 cairo_paint(copy_cr);
70 cairo_destroy(copy_cr);
71 }
72
73 cairo_set_source_surface(cr, surface_, x, y);
74 }
75