/* -*- 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):
 *   Robert O'Callahan <robert@ocallahan.org>
 *   Vladimir Vukicevic <vladimir@pobox.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 ***** */

#include "ColorLayerOGL.h"

namespace mozilla {
namespace layers {

static void
RenderColorLayer(ColorLayer* aLayer, LayerManagerOGL *aManager,
                 const nsIntPoint& aOffset)
{
  aManager->MakeCurrent();

  // XXX we might be able to improve performance by using glClear

  nsIntRect visibleRect = aLayer->GetEffectiveVisibleRegion().GetBounds();
  
  /* Multiply color by the layer opacity, as the shader
   * ignores layer opacity and expects a final color to
   * write to the color buffer.  This saves a needless
   * multiply in the fragment shader.
   */
  float opacity = aLayer->GetOpacity();
  gfxRGBA color(aLayer->GetColor());
  color.r *= opacity;
  color.g *= opacity;
  color.b *= opacity;
  color.a *= opacity;

  SolidColorLayerProgram *program = aManager->GetColorLayerProgram();
  program->Activate();
  program->SetLayerQuadRect(visibleRect);
  program->SetLayerTransform(aLayer->GetEffectiveTransform());
  program->SetRenderOffset(aOffset);
  program->SetRenderColor(color);

  aManager->BindAndDrawQuad(program);

  DEBUG_GL_ERROR_CHECK(aManager->gl());
}

void
ColorLayerOGL::RenderLayer(int,
                           const nsIntPoint& aOffset)
{
  return RenderColorLayer(this, mOGLManager, aOffset);
}

#ifdef MOZ_IPC
void
ShadowColorLayerOGL::RenderLayer(int,
                                 const nsIntPoint& aOffset)
{
  return RenderColorLayer(this, mOGLManager, aOffset);
}
#endif  // MOZ_IPC


} /* layers */
} /* mozilla */