Adds kind-of-live thumbnail generation for a potential tab switcher.

chrome/common/transport_dib.h

 // Copyright (c) 2006-2009 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_COMMON_TRANSPORT_DIB_H_
 #define CHROME_COMMON_TRANSPORT_DIB_H_
 
 #include "base/basictypes.h"
 
 #if defined(OS_WIN) || defined(OS_MACOSX)
 #include "base/shared_memory.h"
 #endif
 
 #if defined(OS_WIN)
 #include <windows.h>
 #elif defined(OS_LINUX)
 #include "chrome/common/x11_util.h"
 #endif
 
 namespace gfx {
 class Size;
 }
+namespace skia {
+class PlatformCanvas;
+}
 
 // -----------------------------------------------------------------------------
 // A TransportDIB is a block of memory that is used to transport pixels
 // between processes: from the renderer process to the browser, and
 // between renderer and plugin processes.
 // -----------------------------------------------------------------------------
 class TransportDIB {
  public:
   ~TransportDIB();
 
@@ skipping 44 matching lines @@
 
   // Create a new TransportDIB
   //   size: the minimum size, in bytes
   //   epoch: Windows only: a global counter. See comment above.
   //   returns: NULL on failure
   static TransportDIB* Create(size_t size, uint32 sequence_num);
 
   // Map the referenced transport DIB. Returns NULL on failure.
   static TransportDIB* Map(Handle transport_dib);
 
+  // Returns a canvas using the memory of this TransportDIB. The returned
+  // pointer will be owned by the caller. The bitmap will be of the given size,
+  // which should fit inside this memory.
+  skia::PlatformCanvas* GetPlatformCanvas(int w, int h);
+
   // Return a pointer to the shared memory
   void* memory() const;
 
   // Return the maximum size of the shared memory. This is not the amount of
   // data which is valid, you have to know that via other means, this is simply
   // the maximum amount that /could/ be valid.
   size_t size() const { return size_; }
 
   // Return the identifier which can be used to refer to this shared memory
   // on the wire.
@@ skipping 20 matching lines @@
   void* address_;  // mapped address
   XID x_shm_;  // X id for the shared segment
   Display* display_;  // connection to the X server
 #endif
   size_t size_;  // length, in bytes
 };
 
 class MessageLoop;
 
 #endif  // CHROME_COMMON_TRANSPORT_DIB_H_