/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla Corporation code.
 *
 * The Initial Developer of the Original Code is Mozilla Foundation.
 * Portions created by the Initial Developer are Copyright (C) 2009
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   James Willcox <jwillcox@mozilla.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#ifndef AndroidGraphicBuffer_h_
#define AndroidGraphicBuffer_h_

#include "gfxASurface.h"
#include "nsRect.h"

namespace mozilla {

/**
 * This class allows access to Android's direct texturing mechanism. Locking
 * the buffer gives you a pointer you can read/write to directly. It is fully
 * threadsafe, but you probably really want to use the AndroidDirectTexture
 * class which will handle double buffering.
 *
 * In order to use the buffer in OpenGL, just call Bind() and it will attach
 * to whatever texture is bound to GL_TEXTURE_2D.
 */
class AndroidGraphicBuffer
{
public:
  enum {
    UsageSoftwareRead = 1,
    UsageSoftwareWrite = 1 << 1,
    UsageTexture = 1 << 2,
    UsageTarget = 1 << 3,
    Usage2D = 1 << 4
  };

  AndroidGraphicBuffer(PRUint32 width, PRUint32 height, PRUint32 usage, gfxASurface::gfxImageFormat format);
  virtual ~AndroidGraphicBuffer();

  bool Lock(PRUint32 usage, unsigned char **bits);
  bool Lock(PRUint32 usage, const nsIntRect& rect, unsigned char **bits);
  bool Unlock();
  bool Reallocate(PRUint32 aWidth, PRUint32 aHeight, gfxASurface::gfxImageFormat aFormat);

  PRUint32 Width() { return mWidth; }
  PRUint32 Height() { return mHeight; }

  bool Bind();

private:
  PRUint32 mWidth;
  PRUint32 mHeight;
  PRUint32 mUsage;
  gfxASurface::gfxImageFormat mFormat;

  bool EnsureInitialized();
  bool EnsureEGLImage();

  void DestroyBuffer();
  bool EnsureBufferCreated();

  PRUint32 GetAndroidUsage(PRUint32 aUsage);
  PRUint32 GetAndroidFormat(gfxASurface::gfxImageFormat aFormat);

  void *mHandle;
  void *mEGLImage;
};

} /* mozilla */
#endif /* AndroidGraphicBuffer_h_ */