Add the xrender backend to the window manager.

x11/x_connection.h

Index: x11/x_connection.h
diff --git a/x11/x_connection.h b/x11/x_connection.h
index d18e9e8c45794a800b526578e0f12ecdbc613cde..cc30b374404cf0bb7a40c1b521d3ff255d85d671 100644
--- a/x11/x_connection.h
+++ b/x11/x_connection.h
@@ -15,6 +15,7 @@
 #include "base/time.h"
 #include "window_manager/geometry.h"
 #include "window_manager/image_enums.h"
+#include "window_manager/math_types.h"
 #include "window_manager/x11/x_types.h"
 
 namespace window_manager {
@@ -545,6 +546,27 @@ class XConnection {
   // to disable automatic window-clearing by the server.
   virtual bool SetWindowBackgroundPixmap(XWindow xid, XPixmap pixmap) = 0;
 
+  // Query the presence of the Render extension

[Daniel Erat, 2011/04/02 14:54:36]

nit: add period at the end of this comment and the other ones.

[marcheu, 2011/04/04 19:55:58]

Done.

+  virtual bool RenderQueryExtension() = 0;
+
+  // Create an XRender Picture
+  virtual XPicture RenderCreatePicture(XDrawable drawable, int depth) = 0;
+
+  // Create an XRender Picture from |data|

[Daniel Erat, 2011/04/02 14:54:36]

nit: describe format of |data|

[marcheu, 2011/04/04 19:55:58]

Done.

+  virtual XPixmap CreatePixmapFromData(char* data, const Size& size) = 0;

[Daniel Erat, 2011/04/02 14:54:36]

can you just make this take an ImageContainer instead?

[marcheu, 2011/04/04 19:55:58]

Done.

+
+  // Perform an XRender Composite operation
+  virtual void RenderComposite(bool blend, XPicture src, XPicture mask,
+                               XPicture dst, Point srcpos, Point maskpos,
+                               Matrix4 transform, Size size) = 0;
+
+  // Free an XRender Picture
+  virtual void RenderFreePicture(XPicture pict) = 0;
+
+  // Do an XRender solid fill
+  virtual void RenderFillRectangle(XPicture dst, float red, float green,
+                                   float blue, Point pos, Size size) = 0;
+
   // Value that should be used in event and property |format| fields for
   // byte and long arguments.
   static const int kByteFormat;