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

chrome/browser/ui/gtk/cairo_cached_surface.h

-// 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.
-
-#ifndef CHROME_BROWSER_UI_GTK_CAIRO_CACHED_SURFACE_H_
-#define CHROME_BROWSER_UI_GTK_CAIRO_CACHED_SURFACE_H_
-#pragma once
-
-typedef struct _GdkPixbuf GdkPixbuf;
-typedef struct _cairo cairo_t;
-typedef struct _cairo_surface cairo_surface_t;
-
-// A helper class that takes a GdkPixbuf* and renders it to the screen. Unlike
-// gdk_cairo_set_source_pixbuf(), CairoCachedSurface assumes that the pixbuf is
-// immutable after UsePixbuf() is called and can be sent to the X server
-// once. From then on, that cached version is used so we don't upload the same
-// image each and every time we expose.
-//
-// Most cached surfaces are owned by the GtkThemeService, which associates
-// them with a certain XDisplay. Some users of surfaces (CustomDrawButtonBase,
-// for example) own their surfaces instead since they interact with the
-// ResourceBundle instead of the GtkThemeService.
-class CairoCachedSurface {
- public:
-  CairoCachedSurface();
-  ~CairoCachedSurface();
-
-  // Whether this CairoCachedSurface owns a GdkPixbuf.
-  bool valid() const {
-    return pixbuf_;
-  }
-
-  // Delete all our data.
-  void Reset();
-
-  // The dimensions of the underlying pixbuf/surface. (or -1 if invalid.)
-  int Width() const;
-  int Height() const;
-
-  // Sets the pixbuf that we pass to cairo. Calling UsePixbuf() only derefs the
-  // current pixbuf and surface (if they exist). Actually transfering data to
-  // the X server occurs at SetSource() time. Calling UsePixbuf() should only
-  // be done once as it clears cached data from the X server.
-  void UsePixbuf(GdkPixbuf* pixbuf);
-
-  // Sets our pixbuf as the active surface starting at (x, y), uploading it in
-  // case we don't have an X backed surface cached.
-  void SetSource(cairo_t* cr, int x, int y);
-
-  // Performs a mask operation, using this surface as the alpha channel.
-  void MaskSource(cairo_t* cr, int x, int y);
-
-  // Raw access to the pixbuf. May be NULL. Used for a few gdk operations
-  // regarding window shaping.
-  GdkPixbuf* pixbuf() { return pixbuf_; }
-
- private:
-  // Makes sure |surface_| is a valid thing that lives on the X server,
-  // uploading it if necessary.
-  void EnsureSurfaceValid(cairo_t* cr);
-
-  // The source pixbuf.
-  GdkPixbuf* pixbuf_;
-
-  // Our cached surface. This should be a xlib surface so the data lives on the
-  // server instead of on the client.
-  cairo_surface_t* surface_;
-};
-
-#endif  // CHROME_BROWSER_UI_GTK_CAIRO_CACHED_SURFACE_H_