Rename CoglPixelArray to CoglPixelBuffer

This is part of a broader cleanup of some of the experimental Cogl API.
One of the reasons for this particular rename is to switch away from
using the term "Array" which implies a regular, indexable layout which
isn't the case. We also want to strongly imply a relationship between
CoglBuffers and CoglPixelBuffers and be consistent with the
CoglAttributeBuffer and CoglIndexBuffer APIs.

cogl/cogl-pixel-buffer-private.h

@@ -0,0 +1,55 @@
+/*
+ * Cogl
+ *
+ * An object oriented GL/GLES Abstraction/Utility Layer
+ *
+ * Copyright (C) 2010 Intel Corporation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ *
+ *
+ * Authors:
+ *   Damien Lespiau <damien.lespiau@intel.com>
+ *   Robert Bragg <robert@linux.intel.com>
+ */
+
+#ifndef __COGL_PIXEL_BUFFER_PRIVATE_H__
+#define __COGL_PIXEL_BUFFER_PRIVATE_H__
+
+#include "cogl-handle.h"
+#include "cogl-buffer-private.h"
+
+#include <glib.h>
+
+G_BEGIN_DECLS
+
+#define COGL_PIXEL_BUFFER(array)     ((CoglPixelBuffer *)(array))
+
+struct _CoglPixelBuffer
+{
+  CoglBuffer            _parent;
+
+  CoglPixelFormat       format;
+  unsigned int          width;
+  unsigned int          height;
+  unsigned int          stride;
+};
+
+GQuark
+_cogl_handle_pixel_buffer_get_type (void);
+
+G_END_DECLS
+
+#endif /* __COGL_PIXEL_BUFFER_PRIVATE_H__ */