C++ Compositor::CreateDataTextureSource方法代码示例

void
ContentHostIncremental::TextureCreationRequest::Execute(ContentHostIncremental* aHost)
{
  Compositor* compositor = aHost->GetCompositor();
  MOZ_ASSERT(compositor);

  RefPtr<DataTextureSource> temp =
    compositor->CreateDataTextureSource(mTextureInfo.mTextureFlags);
  MOZ_ASSERT(temp->AsSourceOGL() &&
             temp->AsSourceOGL()->AsTextureImageTextureSource());
  RefPtr<TextureImageTextureSourceOGL> newSource =
    temp->AsSourceOGL()->AsTextureImageTextureSource();

  RefPtr<TextureImageTextureSourceOGL> newSourceOnWhite;
  if (mTextureInfo.mTextureFlags & TextureFlags::COMPONENT_ALPHA) {
    temp =
      compositor->CreateDataTextureSource(mTextureInfo.mTextureFlags);
    MOZ_ASSERT(temp->AsSourceOGL() &&
               temp->AsSourceOGL()->AsTextureImageTextureSource());
    newSourceOnWhite = temp->AsSourceOGL()->AsTextureImageTextureSource();
  }

  if (mTextureInfo.mDeprecatedTextureHostFlags & DeprecatedTextureHostFlags::COPY_PREVIOUS) {
    MOZ_ASSERT(aHost->mSource);
    MOZ_ASSERT(aHost->mSource->IsValid());
    nsIntRect bufferRect = aHost->mBufferRect;
    nsIntPoint bufferRotation = aHost->mBufferRotation;
    nsIntRect overlap;

    // The buffer looks like:
    //  ______
    // |1  |2 |  Where the center point is offset by mBufferRotation from the top-left corner.
    // |___|__|
    // |3  |4 |
    // |___|__|
    //
    // This is drawn to the screen as:
    //  ______
    // |4  |3 |  Where the center point is { width - mBufferRotation.x, height - mBufferRotation.y } from
    // |___|__|  from the top left corner - rotationPoint.
    // |2  |1 |
    // |___|__|
    //

    // The basic idea below is to take all quadrant rectangles from the src and transform them into rectangles
    // in the destination. Unfortunately, it seems it is overly complex and could perhaps be simplified.

    nsIntRect srcBufferSpaceBottomRight(bufferRotation.x, bufferRotation.y, bufferRect.width - bufferRotation.x, bufferRect.height - bufferRotation.y);
    nsIntRect srcBufferSpaceTopRight(bufferRotation.x, 0, bufferRect.width - bufferRotation.x, bufferRotation.y);
    nsIntRect srcBufferSpaceTopLeft(0, 0, bufferRotation.x, bufferRotation.y);
    nsIntRect srcBufferSpaceBottomLeft(0, bufferRotation.y, bufferRotation.x, bufferRect.height - bufferRotation.y);

    overlap.IntersectRect(bufferRect, mBufferRect);

    nsIntRect srcRect(overlap), dstRect(overlap);
    srcRect.MoveBy(- bufferRect.TopLeft() + bufferRotation);

    nsIntRect srcRectDrawTopRight(srcRect);
    nsIntRect srcRectDrawTopLeft(srcRect);
    nsIntRect srcRectDrawBottomLeft(srcRect);
    // transform into the different quadrants
    srcRectDrawTopRight  .MoveBy(-nsIntPoint(0, bufferRect.height));
    srcRectDrawTopLeft   .MoveBy(-nsIntPoint(bufferRect.width, bufferRect.height));
    srcRectDrawBottomLeft.MoveBy(-nsIntPoint(bufferRect.width, 0));

    // Intersect with the quadrant
    srcRect               = srcRect              .Intersect(srcBufferSpaceBottomRight);
    srcRectDrawTopRight   = srcRectDrawTopRight  .Intersect(srcBufferSpaceTopRight);
    srcRectDrawTopLeft    = srcRectDrawTopLeft   .Intersect(srcBufferSpaceTopLeft);
    srcRectDrawBottomLeft = srcRectDrawBottomLeft.Intersect(srcBufferSpaceBottomLeft);

    dstRect = srcRect;
    nsIntRect dstRectDrawTopRight(srcRectDrawTopRight);
    nsIntRect dstRectDrawTopLeft(srcRectDrawTopLeft);
    nsIntRect dstRectDrawBottomLeft(srcRectDrawBottomLeft);

    // transform back to src buffer space
    dstRect              .MoveBy(-bufferRotation);
    dstRectDrawTopRight  .MoveBy(-bufferRotation + nsIntPoint(0, bufferRect.height));
    dstRectDrawTopLeft   .MoveBy(-bufferRotation + nsIntPoint(bufferRect.width, bufferRect.height));
    dstRectDrawBottomLeft.MoveBy(-bufferRotation + nsIntPoint(bufferRect.width, 0));

    // transform back to draw coordinates
    dstRect              .MoveBy(bufferRect.TopLeft());
    dstRectDrawTopRight  .MoveBy(bufferRect.TopLeft());
    dstRectDrawTopLeft   .MoveBy(bufferRect.TopLeft());
    dstRectDrawBottomLeft.MoveBy(bufferRect.TopLeft());

    // transform to destBuffer space
    dstRect              .MoveBy(-mBufferRect.TopLeft());
    dstRectDrawTopRight  .MoveBy(-mBufferRect.TopLeft());
    dstRectDrawTopLeft   .MoveBy(-mBufferRect.TopLeft());
    dstRectDrawBottomLeft.MoveBy(-mBufferRect.TopLeft());

    newSource->EnsureBuffer(mBufferRect.Size(),
                           ContentForFormat(aHost->mSource->GetFormat()));

    aHost->mSource->CopyTo(srcRect, newSource, dstRect);
    if (bufferRotation != nsIntPoint(0, 0)) {
      // Draw the remaining quadrants. We call BlitTextureImage 3 extra
//.........这里部分代码省略.........

static void DrawVelGraph(const nsIntRect& aClipRect,
                         LayerManagerComposite* aManager,
                         Layer* aLayer) {
  Compositor* compositor = aManager->GetCompositor();
  gfx::Rect clipRect(aClipRect.x, aClipRect.y,
                     aClipRect.width, aClipRect.height);

  TimeStamp now = TimeStamp::Now();
  LayerVelocityUserData* velocityData = GetVelocityData(aLayer);

  if (velocityData->mData.size() >= 1 &&
    now > velocityData->mData[velocityData->mData.size() - 1].mFrameTime +
      TimeDuration::FromMilliseconds(200)) {
    // clear stale data
    velocityData->mData.clear();
  }

  const gfx::Point layerTransform = GetScrollData(aLayer);
  velocityData->mData.push_back(
    LayerVelocityUserData::VelocityData(now,
      static_cast<int>(layerTransform.x), static_cast<int>(layerTransform.y)));

  // TODO: dump to file
  // XXX: Uncomment these lines to enable ScrollGraph logging. This is
  //      useful for HVGA phones or to output the data to accurate
  //      graphing software.
  // printf_stderr("ScrollGraph (%p): %f, %f\n",
  // aLayer, layerTransform.x, layerTransform.y);

  // Keep a circular buffer of 100.
  size_t circularBufferSize = 100;
  if (velocityData->mData.size() > circularBufferSize) {
    velocityData->mData.erase(velocityData->mData.begin());
  }

  if (velocityData->mData.size() == 1) {
    return;
  }

  // Clear and disable the graph when it's flat
  for (size_t i = 1; i < velocityData->mData.size(); i++) {
    if (velocityData->mData[i - 1].mPoint != velocityData->mData[i].mPoint) {
      break;
    }
    if (i == velocityData->mData.size() - 1) {
      velocityData->mData.clear();
      return;
    }
  }

  if (aLayer->GetEffectiveVisibleRegion().GetBounds().width < 300 ||
      aLayer->GetEffectiveVisibleRegion().GetBounds().height < 300) {
    // Don't want a graph for smaller layers
    return;
  }

  aManager->SetDebugOverlayWantsNextFrame(true);

  const Matrix4x4& transform = aLayer->GetEffectiveTransform();
  nsIntRect bounds = aLayer->GetEffectiveVisibleRegion().GetBounds();
  IntSize graphSize = IntSize(200, 100);
  Rect graphRect = Rect(bounds.x, bounds.y, graphSize.width, graphSize.height);

  RefPtr<DrawTarget> dt = aManager->CreateDrawTarget(graphSize, SurfaceFormat::B8G8R8A8);
  dt->FillRect(Rect(0, 0, graphSize.width, graphSize.height),
               ColorPattern(Color(0.2f,0,0,1)));

  int yScaleFactor = 3;
  Point prev = Point(0,0);
  bool first = true;
  for (int32_t i = (int32_t)velocityData->mData.size() - 2; i >= 0; i--) {
    const gfx::Point& p1 = velocityData->mData[i+1].mPoint;
    const gfx::Point& p2 = velocityData->mData[i].mPoint;
    int vel = sqrt((p1.x - p2.x) * (p1.x - p2.x) +
                   (p1.y - p2.y) * (p1.y - p2.y));
    Point next = Point(graphRect.width / circularBufferSize * i,
                       graphRect.height - vel/yScaleFactor);
    if (first) {
      first = false;
    } else {
      dt->StrokeLine(prev, next, ColorPattern(Color(0,1,0,1)));
    }
    prev = next;
  }

  RefPtr<DataTextureSource> textureSource = compositor->CreateDataTextureSource();
  RefPtr<SourceSurface> snapshot = dt->Snapshot();
  RefPtr<DataSourceSurface> data = snapshot->GetDataSurface();
  textureSource->Update(data);

  EffectChain effectChain;
  effectChain.mPrimaryEffect = CreateTexturedEffect(SurfaceFormat::B8G8R8A8,
                                                    textureSource,
                                                    Filter::POINT,
                                                    true);

  compositor->DrawQuad(graphRect,
                       clipRect,
                       effectChain,
                       1.0f,
//.........这里部分代码省略.........