OSR transparency lost during cross-site navigation [Windows]

[0xDEADFEED]

I have been debugging an issue with a recent integration of the 3071 CEF branch into my application. We have some cross-site navigation to/from transparent pages. When running with off screen rendering, disable-gpu, and disable-gpu-compositing, this navigation results in the transparent background turning opaque white.

It appears that the transparency is set to the incorrect view during some cases where the RenderFrameHostManager creates a pending render frame host. To fix the issue I made the following change:

web_contents_view_osr.cc

Code: Select all

void CefWebContentsViewOSR::RenderViewCreated(content::RenderViewHost* host) {
  if (host && host->GetWidget() && host->GetWidget()->GetView())
  {
    CefRenderWidgetHostViewOSR* PasedInView =
      static_cast<CefRenderWidgetHostViewOSR*>(host->GetWidget()->GetView());
    if (PasedInView)
    {
      PasedInView->InstallTransparency();
    }
  }
  // Old code that will use the current RenderViewHost, not the pending/created one
  //CefRenderWidgetHostViewOSR* view = GetView();
  //if (view)
  //  view->InstallTransparency();
}

Is there a reason this function was not using the passed in host param before? Also, before finding this issue, I have been seeing and working around a number of issues revolving around this type of navigation. Looking back, I'm starting to wonder if there are other Pending vs Current frame host issues lurking about.

[magreenblatt]

Please add an issue in the tracker.

[0xDEADFEED]

Added issue to the tracker here: https://bitbucket.org/chromiumembedded/ ... cross-site