C++ (Cpp) FrameMetrics::LayersPixelsPerCSSPixel Examples

Example #1

File: ClientLayerManager.cpp Project: hobinjk/gecko-dev

bool
ClientLayerManager::ProgressiveUpdateCallback(bool aHasPendingNewThebesContent,
                                              FrameMetrics& aMetrics,
                                              bool aDrawingCritical)
{
#ifdef MOZ_WIDGET_ANDROID
  MOZ_ASSERT(aMetrics.IsScrollable());
  // This is derived from the code in
  // gfx/layers/ipc/CompositorParent.cpp::TransformShadowTree.
  CSSToLayerScale paintScale = aMetrics.LayersPixelsPerCSSPixel().ToScaleFactor();
  const CSSRect& metricsDisplayPort =
    (aDrawingCritical && !aMetrics.GetCriticalDisplayPort().IsEmpty()) ?
      aMetrics.GetCriticalDisplayPort() : aMetrics.GetDisplayPort();
  LayerRect displayPort = (metricsDisplayPort + aMetrics.GetScrollOffset()) * paintScale;

  ParentLayerPoint scrollOffset;
  CSSToParentLayerScale zoom;
  bool ret = AndroidBridge::Bridge()->ProgressiveUpdateCallback(
    aHasPendingNewThebesContent, displayPort, paintScale.scale, aDrawingCritical,
    scrollOffset, zoom);
  aMetrics.SetScrollOffset(scrollOffset / zoom);
  aMetrics.SetZoom(CSSToParentLayerScale2D(zoom));
  return ret;
#else
  return false;
#endif
}