Linux: support displays without Xrender support.

chrome/browser/renderer_host/backing_store.h

 // Copyright (c) 2006-2008 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_RENDERER_HOST_BACKING_STORE_H_
 #define CHROME_BROWSER_RENDERER_HOST_BACKING_STORE_H_
 
 #include "base/basictypes.h"
 #include "base/gfx/rect.h"
 #include "base/gfx/size.h"
@@ skipping 19 matching lines @@
  public:
 #if defined(OS_WIN) || defined(OS_MACOSX)
   explicit BackingStore(const gfx::Size& size);
 #elif defined(OS_LINUX)
   // Create a backing store on the X server.
   //   size: the size of the server-side pixmap
   //   x_connection: the display to target
   //   depth: the depth of the X window which will be drawn into
   //   visual: An Xlib Visual describing the format of the target window
   //   root_window: The X id of the root window
+  //   use_render: if true, the X server supports Xrender
   //   use_shared_memory: if true, the X server is local
   BackingStore(const gfx::Size& size, Display* x_connection, int depth,
-               void* visual, XID root_window, bool use_shared_memory);
+               void* visual, XID root_window, bool use_render,
+               bool use_shared_memory);
   // This is for unittesting only. An object constructed using this constructor
   // will silently ignore all paints
   explicit BackingStore(const gfx::Size& size);
 #endif
   ~BackingStore();
 
   const gfx::Size& size() { return size_; }
 
 #if defined(OS_WIN)
   HDC hdc() { return hdc_; }
@@ skipping 38 matching lines @@
   HDC hdc_;
 
   // Handle to the backing store dib.
   HANDLE backing_store_dib_;
 
   // Handle to the original bitmap in the dc.
   HANDLE original_bitmap_;
 #elif defined(OS_MACOSX)
   skia::PlatformCanvas canvas_;
 #elif defined(OS_LINUX)
+  // Paints the bitmap from the renderer onto the backing store without
+  // using Xrender to composite the pixmaps.
+  void PaintRectWithoutXrender(TransportDIB* bitmap,
+                               const gfx::Rect& bitmap_rect);
+
   // This is the connection to the X server where this backing store will be
   // displayed.
   Display *const display_;
   // If this is true, then |connection_| is good for MIT-SHM (X shared memory).
   const bool use_shared_memory_;
+  // If this is true, then we can use Xrender to composite our pixmaps.
+  const bool use_render_;
+  // If |use_render_| is false, this is the number of bits-per-pixel for |depth|
+  int pixmap_bpp_;
+  // This is the depth of the target window.
+  const int visual_depth_;
   // The parent window (probably a GtkDrawingArea) for this backing store.
   const XID root_window_;
   // This is a handle to the server side pixmap which is our backing store.
   XID pixmap_;
   // This is the RENDER picture pointing at |pixmap_|.
   XID picture_;
   // This is a default graphic context, used in XCopyArea
   void* pixmap_gc_;
 #endif
 
@@ skipping 46 matching lines @@
   static void RemoveBackingStore(RenderWidgetHost* host);
 
  private:
   // Not intended for instantiation.
   BackingStoreManager() {}
 
   DISALLOW_COPY_AND_ASSIGN(BackingStoreManager);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_BACKING_STORE_H_