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

ui/gfx/image/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_
+#ifndef UI_GFX_IMAGE_CAIRO_CACHED_SURFACE_H_
+#define UI_GFX_IMAGE_CAIRO_CACHED_SURFACE_H_
 #pragma once
 
+#include <vector>
+
+#include "ui/base/ui_export.h"
+
+typedef struct _GdkDisplay GdkDisplay;
 typedef struct _GdkPixbuf GdkPixbuf;
+typedef struct _GtkWidget GtkWidget;
 typedef struct _cairo cairo_t;
 typedef struct _cairo_surface cairo_surface_t;
 
+namespace gfx {
+
 // 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
+// immutable after UsePixbuf() is called and can be sent to the display 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 {
+class UI_EXPORT 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);
+  void SetSource(cairo_t* cr, GtkWidget* widget, int x, int y) const;
+  void SetSource(cairo_t* cr, GdkDisplay* display, int x, int y) const;
 
   // Performs a mask operation, using this surface as the alpha channel.
-  void MaskSource(cairo_t* cr, int x, int y);
+  void MaskSource(cairo_t* cr, GtkWidget* widget, int x, int y) const;
+  void MaskSource(cairo_t* cr, GdkDisplay* display, int x, int y) const;
 
   // 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);
+  typedef std::vector<std::pair<GdkDisplay*, cairo_surface_t*> > SurfaceVector;
+
+  // Returns a surface . Caches results so only one copy of the image data
+  // lives on the display server.
+  cairo_surface_t* GetSurfaceFor(cairo_t* cr, GdkDisplay* display) const;
 
   // 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_;
+  // Our list of cached surfaces. 99% of the time, this will only contain a
+  // single entry. At most two. We need to get this right for multiple displays
+  // to work correct, since each GdkDisplay is a different display server.
+  mutable SurfaceVector surface_map_;
 };
 
-#endif  // CHROME_BROWSER_UI_GTK_CAIRO_CACHED_SURFACE_H_
+}  // namespace gfx
+
+#endif  // UI_GFX_IMAGE_CAIRO_CACHED_SURFACE_H_