GTK: Move CairoCachedSurface from being owned by GtkThemeService to gfx::Image.

CairoCachedSurfaces are representations of a GdkPixbuf that live on the display
server instead of in process. GtkThemeService currently returns a
CairoCachedSurface for a (IDR#, Display). Instead, make gfx::Image keep
CairoCachedSurfaces as a representation and make CairoCachedSurface work on any
display, keeping the mapping to display server resources as an implementation
detail.

This has the benefit of:

- You don't need to go through GtkThemeService to access all resources,
  simplifying the code in some places and allowing sharing of static images
  across profiles.
- This will let us (in the future) remove several image conversions in the GTK
  port.

This is part 1. Part 2 will remove the custom CairoCachedSurface calls from
GtkThemeService.

BUG=106060
TEST=none
R=rsesek@chromium.org
TBR=ben@chromium.org

Review URL: http://codereview.chromium.org/8769017

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@112778 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 109 insertions, 0 deletions

diff --git a/ui/gfx/image/cairo_cached_surface.cc b/ui/gfx/image/cairo_cached_surface.cc
new file mode 100644
index 0000000..2de4a32
--- /dev/null
+++ b/ui/gfx/image/cairo_cached_surface.cc
@@ -0,0 +1,109 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ui/gfx/image/cairo_cached_surface.h"
+
+#include <gtk/gtk.h>
+
+#include "base/basictypes.h"
+#include "base/logging.h"
+
+namespace gfx {
+
+CairoCachedSurface::CairoCachedSurface() : pixbuf_(NULL) {
+}
+
+CairoCachedSurface::~CairoCachedSurface() {
+  Reset();
+}
+
+void CairoCachedSurface::Reset() {
+  for (SurfaceVector::iterator it = surface_map_.begin();
+       it != surface_map_.end(); ++it) {
+    cairo_surface_destroy(it->second);
+  }
+  surface_map_.clear();
+
+  if (pixbuf_) {
+    g_object_unref(pixbuf_);
+    pixbuf_ = NULL;
+  }
+}
+
+int CairoCachedSurface::Width() const {
+  return pixbuf_ ? gdk_pixbuf_get_width(pixbuf_) : -1;
+}
+
+int CairoCachedSurface::Height() const {
+  return pixbuf_ ? gdk_pixbuf_get_height(pixbuf_) : -1;
+}
+
+void CairoCachedSurface::UsePixbuf(GdkPixbuf* pixbuf) {
+  if (pixbuf)
+    g_object_ref(pixbuf);
+
+  Reset();
+
+  pixbuf_ = pixbuf;
+}
+
+void CairoCachedSurface::SetSource(cairo_t* cr, GtkWidget* widget,
+                                   int x, int y) const {
+  SetSource(cr, gtk_widget_get_display(widget), x, y);
+}
+
+void CairoCachedSurface::SetSource(cairo_t* cr, GdkDisplay* display,
+                                   int x, int y) const {
+  DCHECK(pixbuf_);
+  DCHECK(cr);
+  DCHECK(display);
+
+  cairo_surface_t* surface = GetSurfaceFor(cr, display);
+  cairo_set_source_surface(cr, surface, x, y);
+}
+
+void CairoCachedSurface::MaskSource(cairo_t* cr, GtkWidget* widget,
+                                    int x, int y) const {
+  MaskSource(cr, gtk_widget_get_display(widget), x, y);
+}
+
+void CairoCachedSurface::MaskSource(cairo_t* cr, GdkDisplay* display,
+                                    int x, int y) const {
+  DCHECK(pixbuf_);
+  DCHECK(cr);
+  DCHECK(display);
+
+  cairo_surface_t* surface = GetSurfaceFor(cr, display);
+  cairo_mask_surface(cr, surface, x, y);
+}
+
+cairo_surface_t* CairoCachedSurface::GetSurfaceFor(cairo_t* cr,
+                                                   GdkDisplay* display) const {
+  for (SurfaceVector::const_iterator it = surface_map_.begin();
+       it != surface_map_.end(); ++it) {
+    if (display == it->first) {
+      return it->second;
+    }
+  }
+
+  // First time here since last UsePixbuf call. Generate the surface.
+  cairo_surface_t* target = cairo_get_target(cr);
+  cairo_surface_t* out = cairo_surface_create_similar(
+      target,
+      CAIRO_CONTENT_COLOR_ALPHA,
+      gdk_pixbuf_get_width(pixbuf_),
+      gdk_pixbuf_get_height(pixbuf_));
+
+  DCHECK(out);
+
+  cairo_t* copy_cr = cairo_create(out);
+  gdk_cairo_set_source_pixbuf(copy_cr, pixbuf_, 0, 0);
+  cairo_paint(copy_cr);
+  cairo_destroy(copy_cr);
+
+  surface_map_.push_back(std::make_pair(display, out));
+  return out;
+}
+
+}  // namespace gfx