gfx/layers/d3d9/ImageLayerD3D9.cpp
author David Anderson <danderson@mozilla.com>
Tue, 13 Mar 2012 16:10:05 -0700
changeset 105978 7eb3fbbd50d7d1ce99527ee27f8b619c87e96fc7
parent 105972 60fb46e7940cdbf645d2ac84b0ac3b7ec2bc4add
parent 88892 709bce4da1415dbb619d3fd159fc290c5d100184
child 105989 7d23c3ea2afe4f01716d32f376176036151c6419
permissions -rw-r--r--
Merge from mozilla-central.

/* -*- 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):
 *   Bas Schouten <bschouten@mozilla.org>
 *
 * 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 "mozilla/layers/PLayers.h"
#include "mozilla/layers/ShadowLayers.h"
#include "ShadowBufferD3D9.h"
#include "gfxSharedImageSurface.h"

#include "ImageLayerD3D9.h"
#include "ThebesLayerD3D9.h"
#include "gfxPlatform.h"
#include "gfxImageSurface.h"
#include "yuv_convert.h"
#include "nsIServiceManager.h" 
#include "nsIConsoleService.h" 
#include "Nv3DVUtils.h"

namespace mozilla {
namespace layers {

static already_AddRefed<IDirect3DTexture9>
DataToTexture(IDirect3DDevice9 *aDevice,
              unsigned char *aData,
              int aStride,
              const gfxIntSize &aSize)
{
  nsRefPtr<IDirect3DTexture9> texture;
  nsRefPtr<IDirect3DDevice9Ex> deviceEx;
  aDevice->QueryInterface(IID_IDirect3DDevice9Ex,
                          (void**)getter_AddRefs(deviceEx));

  if (deviceEx) {
    // D3D9Ex doesn't support managed textures. We could use dynamic textures
    // here but since Images are immutable that probably isn't such a great
    // idea.
    if (FAILED(aDevice->
               CreateTexture(aSize.width, aSize.height,
                             1, 0, D3DFMT_A8R8G8B8, D3DPOOL_DEFAULT,
                             getter_AddRefs(texture), NULL)))
    {
      return NULL;
    }

    nsRefPtr<IDirect3DSurface9> surface;
    if (FAILED(aDevice->
               CreateOffscreenPlainSurface(aSize.width,
                                           aSize.height,
                                           D3DFMT_A8R8G8B8,
                                           D3DPOOL_SYSTEMMEM,
                                           getter_AddRefs(surface),
                                           NULL)))
    {
      return NULL;
    }

    D3DLOCKED_RECT lockedRect;
    surface->LockRect(&lockedRect, NULL, 0);
    for (int y = 0; y < aSize.height; y++) {
      memcpy((char*)lockedRect.pBits + lockedRect.Pitch * y,
             aData + aStride * y,
             aSize.width * 4);
    }
    surface->UnlockRect();
    nsRefPtr<IDirect3DSurface9> dstSurface;
    texture->GetSurfaceLevel(0, getter_AddRefs(dstSurface));
    aDevice->UpdateSurface(surface, NULL, dstSurface, NULL);
  } else {
    if (FAILED(aDevice->
               CreateTexture(aSize.width, aSize.height,
                             1, 0, D3DFMT_A8R8G8B8, D3DPOOL_MANAGED,
                             getter_AddRefs(texture), NULL)))
    {
      return NULL;
    }

    D3DLOCKED_RECT lockrect;
    /* lock the entire texture */
    texture->LockRect(0, &lockrect, NULL, 0);

    // copy over data. If we don't need to do any swaping we can
    // use memcpy
    for (int y = 0; y < aSize.height; y++) {
      memcpy((char*)lockrect.pBits + lockrect.Pitch * y,
             aData + aStride * y,
             aSize.width * 4);
    }

    texture->UnlockRect(0);
  }

  return texture.forget();
}

static already_AddRefed<IDirect3DTexture9>
SurfaceToTexture(IDirect3DDevice9 *aDevice,
                 gfxASurface *aSurface,
                 const gfxIntSize &aSize)
{

  nsRefPtr<gfxImageSurface> imageSurface = aSurface->GetAsImageSurface();

  if (!imageSurface) {
    imageSurface = new gfxImageSurface(aSize,
                                       gfxASurface::ImageFormatARGB32);
    
    nsRefPtr<gfxContext> context = new gfxContext(imageSurface);
    context->SetSource(aSurface);
    context->SetOperator(gfxContext::OPERATOR_SOURCE);
    context->Paint();
  }

  return DataToTexture(aDevice, imageSurface->Data(), imageSurface->Stride(), aSize);
}

static void AllocateTexturesYCbCr(PlanarYCbCrImage *aImage,
                                  IDirect3DDevice9 *aDevice,
                                  LayerManagerD3D9 *aManager)
{
  nsAutoPtr<PlanarYCbCrD3D9BackendData> backendData(
    new PlanarYCbCrD3D9BackendData);

  PlanarYCbCrImage::Data &data = aImage->mData;

  D3DLOCKED_RECT lockrectY;
  D3DLOCKED_RECT lockrectCb;
  D3DLOCKED_RECT lockrectCr;
  PRUint8* src;
  PRUint8* dest;

  nsRefPtr<IDirect3DSurface9> tmpSurfaceY;
  nsRefPtr<IDirect3DSurface9> tmpSurfaceCb;
  nsRefPtr<IDirect3DSurface9> tmpSurfaceCr;

  nsRefPtr<IDirect3DDevice9Ex> deviceEx;
  aDevice->QueryInterface(IID_IDirect3DDevice9Ex,
                           getter_AddRefs(deviceEx));

  bool isD3D9Ex = deviceEx;

  if (isD3D9Ex) {
    nsRefPtr<IDirect3DTexture9> tmpYTexture;
    nsRefPtr<IDirect3DTexture9> tmpCbTexture;
    nsRefPtr<IDirect3DTexture9> tmpCrTexture;
    // D3D9Ex does not support the managed pool, could use dynamic textures
    // here. But since an Image is immutable static textures are probably a
    // better idea.

    HRESULT hr;
    hr = aDevice->CreateTexture(data.mYSize.width, data.mYSize.height,
                                1, 0, D3DFMT_L8, D3DPOOL_DEFAULT,
                                getter_AddRefs(backendData->mYTexture), NULL);
    if (!FAILED(hr)) {
      hr = aDevice->CreateTexture(data.mCbCrSize.width, data.mCbCrSize.height,
                                  1, 0, D3DFMT_L8, D3DPOOL_DEFAULT,
                                  getter_AddRefs(backendData->mCbTexture), NULL);
    }
    if (!FAILED(hr)) {
      hr = aDevice->CreateTexture(data.mCbCrSize.width, data.mCbCrSize.height,
                                  1, 0, D3DFMT_L8, D3DPOOL_DEFAULT,
                                  getter_AddRefs(backendData->mCrTexture), NULL);
    }
    if (!FAILED(hr)) {
      hr = aDevice->CreateTexture(data.mYSize.width, data.mYSize.height,
                                  1, 0, D3DFMT_L8, D3DPOOL_SYSTEMMEM,
                                  getter_AddRefs(tmpYTexture), NULL);
    }
    if (!FAILED(hr)) {
      hr = aDevice->CreateTexture(data.mCbCrSize.width, data.mCbCrSize.height,
                                  1, 0, D3DFMT_L8, D3DPOOL_SYSTEMMEM,
                                  getter_AddRefs(tmpCbTexture), NULL);
    }
    if (!FAILED(hr)) {
      hr = aDevice->CreateTexture(data.mCbCrSize.width, data.mCbCrSize.height,
                                  1, 0, D3DFMT_L8, D3DPOOL_SYSTEMMEM,
                                  getter_AddRefs(tmpCrTexture), NULL);
    }

    if (FAILED(hr)) {
      aManager->ReportFailure(NS_LITERAL_CSTRING("PlanarYCbCrImageD3D9::AllocateTextures(): Failed to create texture (isD3D9Ex)"),
                              hr);
      return;
    }

    tmpYTexture->GetSurfaceLevel(0, getter_AddRefs(tmpSurfaceY));
    tmpCbTexture->GetSurfaceLevel(0, getter_AddRefs(tmpSurfaceCb));
    tmpCrTexture->GetSurfaceLevel(0, getter_AddRefs(tmpSurfaceCr));
    tmpSurfaceY->LockRect(&lockrectY, NULL, 0);
    tmpSurfaceCb->LockRect(&lockrectCb, NULL, 0);
    tmpSurfaceCr->LockRect(&lockrectCr, NULL, 0);
  } else {
    HRESULT hr;
    hr = aDevice->CreateTexture(data.mYSize.width, data.mYSize.height,
                                1, 0, D3DFMT_L8, D3DPOOL_MANAGED,
                                getter_AddRefs(backendData->mYTexture), NULL);
    if (!FAILED(hr)) {
      aDevice->CreateTexture(data.mCbCrSize.width, data.mCbCrSize.height,
                             1, 0, D3DFMT_L8, D3DPOOL_MANAGED,
                             getter_AddRefs(backendData->mCbTexture), NULL);
    }
    if (!FAILED(hr)) {
      aDevice->CreateTexture(data.mCbCrSize.width, data.mCbCrSize.height,
                             1, 0, D3DFMT_L8, D3DPOOL_MANAGED,
                             getter_AddRefs(backendData->mCrTexture), NULL);
    }

    if (FAILED(hr)) {
      aManager->ReportFailure(NS_LITERAL_CSTRING("PlanarYCbCrImageD3D9::AllocateTextures(): Failed to create texture (!isD3D9Ex)"),
                              hr);
      return;
    }

    /* lock the entire texture */
    backendData->mYTexture->LockRect(0, &lockrectY, NULL, 0);
    backendData->mCbTexture->LockRect(0, &lockrectCb, NULL, 0);
    backendData->mCrTexture->LockRect(0, &lockrectCr, NULL, 0);
  }

  src  = data.mYChannel;
  //FIX cast
  dest = (PRUint8*)lockrectY.pBits;

  // copy over data
  for (int h=0; h<data.mYSize.height; h++) {
    memcpy(dest, src, data.mYSize.width);
    dest += lockrectY.Pitch;
    src += data.mYStride;
  }

  src  = data.mCbChannel;
  //FIX cast
  dest = (PRUint8*)lockrectCb.pBits;

  // copy over data
  for (int h=0; h<data.mCbCrSize.height; h++) {
    memcpy(dest, src, data.mCbCrSize.width);
    dest += lockrectCb.Pitch;
    src += data.mCbCrStride;
  }

  src  = data.mCrChannel;
  //FIX cast
  dest = (PRUint8*)lockrectCr.pBits;

  // copy over data
  for (int h=0; h<data.mCbCrSize.height; h++) {
    memcpy(dest, src, data.mCbCrSize.width);
    dest += lockrectCr.Pitch;
    src += data.mCbCrStride;
  }

  if (isD3D9Ex) {
    tmpSurfaceY->UnlockRect();
    tmpSurfaceCb->UnlockRect();
    tmpSurfaceCr->UnlockRect();
    nsRefPtr<IDirect3DSurface9> dstSurface;
    backendData->mYTexture->GetSurfaceLevel(0, getter_AddRefs(dstSurface));
    aDevice->UpdateSurface(tmpSurfaceY, NULL, dstSurface, NULL);
    backendData->mCbTexture->GetSurfaceLevel(0, getter_AddRefs(dstSurface));
    aDevice->UpdateSurface(tmpSurfaceCb, NULL, dstSurface, NULL);
    backendData->mCrTexture->GetSurfaceLevel(0, getter_AddRefs(dstSurface));
    aDevice->UpdateSurface(tmpSurfaceCr, NULL, dstSurface, NULL);
  } else {
    backendData->mYTexture->UnlockRect(0);
    backendData->mCbTexture->UnlockRect(0);
    backendData->mCrTexture->UnlockRect(0);
  }

  aImage->SetBackendData(LayerManager::LAYERS_D3D9, backendData.forget());
}

Layer*
ImageLayerD3D9::GetLayer()
{
  return this;
}

void
ImageLayerD3D9::RenderLayer()
{
  ImageContainer *container = GetContainer();
  if (!container) {
    return;
  }

  AutoLockImage autoLock(container);

  Image *image = autoLock.GetImage();
  if (!image) {
    return;
  }

  SetShaderTransformAndOpacity();

  gfxIntSize size = mScaleMode == SCALE_NONE ? image->GetSize() : mScaleToSize;

  if (image->GetFormat() == Image::CAIRO_SURFACE || image->GetFormat() == Image::REMOTE_IMAGE_BITMAP)
  {
    bool hasAlpha = false;

    if (image->GetFormat() == Image::REMOTE_IMAGE_BITMAP) {
      RemoteBitmapImage *remoteImage =
        static_cast<RemoteBitmapImage*>(image);
      
      if (!image->GetBackendData(LayerManager::LAYERS_D3D9)) {
        nsAutoPtr<TextureD3D9BackendData> dat = new TextureD3D9BackendData();
        dat->mTexture = DataToTexture(device(), remoteImage->mData, remoteImage->mStride, remoteImage->mSize);
        if (dat->mTexture) {
          image->SetBackendData(LayerManager::LAYERS_D3D9, dat.forget());
        }
      }

      hasAlpha = remoteImage->mFormat == RemoteImageData::BGRA32;
    } else {
      CairoImage *cairoImage =
        static_cast<CairoImage*>(image);

      if (!cairoImage->mSurface) {
        return;
      }

      if (!image->GetBackendData(LayerManager::LAYERS_D3D9)) {
        nsAutoPtr<TextureD3D9BackendData> dat = new TextureD3D9BackendData();
        dat->mTexture = SurfaceToTexture(device(), cairoImage->mSurface, cairoImage->mSize);
        if (dat->mTexture) {
          image->SetBackendData(LayerManager::LAYERS_D3D9, dat.forget());
        }
      }

      hasAlpha = cairoImage->mSurface->GetContentType() == gfxASurface::CONTENT_COLOR_ALPHA;
    }

    TextureD3D9BackendData *data =
      static_cast<TextureD3D9BackendData*>(image->GetBackendData(LayerManager::LAYERS_D3D9));

    if (!data) {
      return;
    }

    nsRefPtr<IDirect3DDevice9> dev;
    data->mTexture->GetDevice(getter_AddRefs(dev));
    if (dev != device()) {
      return;
    }

    device()->SetVertexShaderConstantF(CBvLayerQuad,
                                       ShaderConstantRect(0,
                                                          0,
                                                          size.width,
                                                          size.height),
                                       1);

    if (hasAlpha) {
      mD3DManager->SetShaderMode(DeviceManagerD3D9::RGBALAYER);
    } else {
      mD3DManager->SetShaderMode(DeviceManagerD3D9::RGBLAYER);
    }

    if (mFilter == gfxPattern::FILTER_NEAREST) {
      device()->SetSamplerState(0, D3DSAMP_MAGFILTER, D3DTEXF_POINT);
      device()->SetSamplerState(0, D3DSAMP_MINFILTER, D3DTEXF_POINT);
    }
    device()->SetTexture(0, data->mTexture);

    image = nsnull;
    data = nsnull;
    autoLock.Unlock();

    device()->DrawPrimitive(D3DPT_TRIANGLESTRIP, 0, 2);
    if (mFilter == gfxPattern::FILTER_NEAREST) {
      device()->SetSamplerState(0, D3DSAMP_MAGFILTER, D3DTEXF_LINEAR);
      device()->SetSamplerState(0, D3DSAMP_MINFILTER, D3DTEXF_LINEAR);
    }
  } else {
    PlanarYCbCrImage *yuvImage =
      static_cast<PlanarYCbCrImage*>(image);

    if (!yuvImage->mBufferSize) {
      return;
    }

    if (!yuvImage->GetBackendData(LayerManager::LAYERS_D3D9)) {
      AllocateTexturesYCbCr(yuvImage, device(), mD3DManager);
    }

    PlanarYCbCrD3D9BackendData *data =
      static_cast<PlanarYCbCrD3D9BackendData*>(yuvImage->GetBackendData(LayerManager::LAYERS_D3D9));

    if (!data) {
      return;
    }

    nsRefPtr<IDirect3DDevice9> dev;
    data->mYTexture->GetDevice(getter_AddRefs(dev));
    if (dev != device()) {
      return;
    }

    device()->SetVertexShaderConstantF(CBvLayerQuad,
                                       ShaderConstantRect(0,
                                                          0,
                                                          size.width,
                                                          size.height),
                                       1);

    device()->SetVertexShaderConstantF(CBvTextureCoords,
      ShaderConstantRect(
        (float)yuvImage->mData.mPicX / yuvImage->mData.mYSize.width,
        (float)yuvImage->mData.mPicY / yuvImage->mData.mYSize.height,
        (float)yuvImage->mData.mPicSize.width / yuvImage->mData.mYSize.width,
        (float)yuvImage->mData.mPicSize.height / yuvImage->mData.mYSize.height
      ),
      1);

    mD3DManager->SetShaderMode(DeviceManagerD3D9::YCBCRLAYER);

    /*
     * Send 3d control data and metadata
     */
    if (mD3DManager->GetNv3DVUtils()) {
      Nv_Stereo_Mode mode;
      switch (yuvImage->mData.mStereoMode) {
      case STEREO_MODE_LEFT_RIGHT:
        mode = NV_STEREO_MODE_LEFT_RIGHT;
        break;
      case STEREO_MODE_RIGHT_LEFT:
        mode = NV_STEREO_MODE_RIGHT_LEFT;
        break;
      case STEREO_MODE_BOTTOM_TOP:
        mode = NV_STEREO_MODE_BOTTOM_TOP;
        break;
      case STEREO_MODE_TOP_BOTTOM:
        mode = NV_STEREO_MODE_TOP_BOTTOM;
        break;
      case STEREO_MODE_MONO:
        mode = NV_STEREO_MODE_MONO;
        break;
      }

      // Send control data even in mono case so driver knows to leave stereo mode.
      mD3DManager->GetNv3DVUtils()->SendNv3DVControl(mode, true, FIREFOX_3DV_APP_HANDLE);

      if (yuvImage->mData.mStereoMode != STEREO_MODE_MONO) {
        mD3DManager->GetNv3DVUtils()->SendNv3DVControl(mode, true, FIREFOX_3DV_APP_HANDLE);

        nsRefPtr<IDirect3DSurface9> renderTarget;
        device()->GetRenderTarget(0, getter_AddRefs(renderTarget));
        mD3DManager->GetNv3DVUtils()->SendNv3DVMetaData((unsigned int)yuvImage->mSize.width,
                                                        (unsigned int)yuvImage->mSize.height, (HANDLE)(data->mYTexture), (HANDLE)(renderTarget));
      }
    }

    // Linear scaling is default here, adhering to mFilter is difficult since
    // presumably even with point filtering we'll still want chroma upsampling
    // to be linear. In the current approach we can't.
    device()->SetTexture(0, data->mYTexture);
    device()->SetTexture(1, data->mCbTexture);
    device()->SetTexture(2, data->mCrTexture);

    image = nsnull;
    data = nsnull;
    autoLock.Unlock();

    device()->DrawPrimitive(D3DPT_TRIANGLESTRIP, 0, 2);

    device()->SetVertexShaderConstantF(CBvTextureCoords,
      ShaderConstantRect(0, 0, 1.0f, 1.0f), 1);
  }

  GetContainer()->NotifyPaintedImage(image);
}

ShadowImageLayerD3D9::ShadowImageLayerD3D9(LayerManagerD3D9* aManager)
  : ShadowImageLayer(aManager, nsnull)
  , LayerD3D9(aManager)
{
  mImplData = static_cast<LayerD3D9*>(this);
}  

ShadowImageLayerD3D9::~ShadowImageLayerD3D9()
{}

void
ShadowImageLayerD3D9::Swap(const SharedImage& aNewFront,
                           SharedImage* aNewBack)
{
  if (aNewFront.type() == SharedImage::TSurfaceDescriptor) {
    if (!mBuffer) {
      mBuffer = new ShadowBufferD3D9(this);
    }
    nsRefPtr<gfxASurface> surf =
      ShadowLayerForwarder::OpenDescriptor(aNewFront.get_SurfaceDescriptor());

    mBuffer->Upload(surf, GetVisibleRegion().GetBounds());
  } else {
    const YUVImage& yuv = aNewFront.get_YUVImage();

    nsRefPtr<gfxSharedImageSurface> surfY =
      gfxSharedImageSurface::Open(yuv.Ydata());
    nsRefPtr<gfxSharedImageSurface> surfU =
      gfxSharedImageSurface::Open(yuv.Udata());
    nsRefPtr<gfxSharedImageSurface> surfV =
      gfxSharedImageSurface::Open(yuv.Vdata());

    PlanarYCbCrImage::Data data;
    data.mYChannel = surfY->Data();
    data.mYStride = surfY->Stride();
    data.mYSize = surfY->GetSize();
    data.mCbChannel = surfU->Data();
    data.mCrChannel = surfV->Data();
    data.mCbCrStride = surfU->Stride();
    data.mCbCrSize = surfU->GetSize();
    data.mPicSize = surfY->GetSize();
    data.mPicX = 0;
    data.mPicY = 0;

    if (!mYCbCrImage) {
      mYCbCrImage = new PlanarYCbCrImage(new BufferRecycleBin());
    }

    mYCbCrImage->SetData(data);

  }
  
  *aNewBack = aNewFront;
}

void
ShadowImageLayerD3D9::Disconnect()
{
  Destroy();
}

void
ShadowImageLayerD3D9::Destroy()
{
  mBuffer = nsnull;
  mYCbCrImage = nsnull;
}

Layer*
ShadowImageLayerD3D9::GetLayer()
{
  return this;
}

void
ShadowImageLayerD3D9::RenderLayer()
{
  if (mBuffer) {
    mBuffer->RenderTo(mD3DManager, GetEffectiveVisibleRegion());
  } else if (mYCbCrImage) {
    if (!mYCbCrImage->mBufferSize) {
      return;
    }

    if (!mYCbCrImage->GetBackendData(LayerManager::LAYERS_D3D9)) {
      AllocateTexturesYCbCr(mYCbCrImage, device(), mD3DManager);
    }

    PlanarYCbCrD3D9BackendData *data =
      static_cast<PlanarYCbCrD3D9BackendData*>(mYCbCrImage->GetBackendData(LayerManager::LAYERS_D3D9));

    if (!data) {
      return;
    }

    if (!mYCbCrImage->mBufferSize) {
      return;
    }
    
    SetShaderTransformAndOpacity();

    device()->SetVertexShaderConstantF(CBvLayerQuad,
                                       ShaderConstantRect(0,
                                                          0,
                                                          mYCbCrImage->mSize.width,
                                                          mYCbCrImage->mSize.height),
                                       1);

    mD3DManager->SetShaderMode(DeviceManagerD3D9::YCBCRLAYER);

    /*
     * Send 3d control data and metadata
     */
    if (mD3DManager->GetNv3DVUtils()) {
      // TODO Add 3D support
    }

    // Linear scaling is default here, adhering to mFilter is difficult since
    // presumably even with point filtering we'll still want chroma upsampling
    // to be linear. In the current approach we can't.
    device()->SetTexture(0, data->mYTexture);
    device()->SetTexture(1, data->mCbTexture);
    device()->SetTexture(2, data->mCrTexture);

    device()->DrawPrimitive(D3DPT_TRIANGLESTRIP, 0, 2);
  } else {
    NS_ERROR("Unexpected image format.");
  }

}


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