gpu: Add support for GLX_EXT_texture_from_pixmap extension.

ui/gl/gl_image.h

+// Copyright (c) 2012 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 UI_GL_GL_IMAGE_H_
+#define UI_GL_GL_IMAGE_H_
+
+#include "base/memory/ref_counted.h"
+#include "ui/gfx/size.h"
+#include "ui/gl/gl_bindings.h"
+#include "ui/gl/gl_export.h"
+
+namespace gfx {
+
+class GLSurface;
+
+// Encapsulates an image that can be bound to a texture, hiding platform
+// specific management.
+class GL_EXPORT GLImage : public base::RefCounted<GLImage> {
+ public:
+  GLImage();
+
+  // Initializes the image to be compatible with the given surface. The image
+  // can be made with other surface's of the same type. The compatible
+  // surface is only needed for certain platforms like WGL, OSMesa and GLX. It
+  // should be specific for all platforms though.
+  virtual bool Initialize(GLSurface* compatible_surface);
+
+  // Destroys the surface.
+  virtual void Destroy() = 0;
+
+  // Get the size of the image.
+  virtual gfx::Size GetSize() = 0;
+
+  // Update pixmap for this GL image and bind it to the current texture unit.
+  virtual bool RebindPixmap(GLuint pixmap);
+
+  // Create a pixmap backed GL image.
+  static scoped_refptr<GLImage> CreatePixmapGLImage(
+      GLSurface* compatible_surface);
+
+ protected:
+  virtual ~GLImage();
+
+ private:
+  friend class base::RefCounted<GLImage>;
+
+  DISALLOW_COPY_AND_ASSIGN(GLImage);
+};
+
+}  // namespace gfx
+
+#endif  // UI_GL_GL_IMAGE_H_