Sets a transparent background for out-of-process subframes.

third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp

 /*
  * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 80 matching lines @@
 WebFrameWidgetImpl::WebFrameWidgetImpl(WebWidgetClient* client, WebLocalFrame* localRoot)
     : m_client(client)
     , m_localRoot(toWebLocalFrameImpl(localRoot))
     , m_layerTreeView(nullptr)
     , m_rootLayer(nullptr)
     , m_rootGraphicsLayer(nullptr)
     , m_isAcceleratedCompositingActive(false)
     , m_layerTreeViewClosed(false)
     , m_suppressNextKeypressEvent(false)
     , m_ignoreInputEvents(false)
+    , m_isTransparent(false)
 #if ENABLE(OILPAN)
     , m_selfKeepAlive(this)
 #endif
 {
     ASSERT(m_localRoot->frame()->isLocalRoot());
     initializeLayerTreeView();
     m_localRoot->setFrameWidget(this);
     allInstances().add(this);
+
+    if (localRoot->parent())
+        setIsTransparent(true);
 }
 
 WebFrameWidgetImpl::~WebFrameWidgetImpl()
 {
 }
 
 DEFINE_TRACE(WebFrameWidgetImpl)
 {
     visitor->trace(m_localRoot);
     visitor->trace(m_mouseCaptureNode);
@@ skipping 152 matching lines @@
 
     // FIXME: We need access to page scale information from the WebView.
     m_layerTreeView->setPageScaleFactorAndLimits(1, 1, 1);
 }
 
 void WebFrameWidgetImpl::updateLayerTreeBackgroundColor()
 {
     if (!m_layerTreeView)
         return;
 
-    m_layerTreeView->setBackgroundColor(alphaChannel(view()->backgroundColorOverride()) ? view()->backgroundColorOverride() : view()->backgroundColor());
+    m_layerTreeView->setBackgroundColor(backgroundColor());
 }
 
 void WebFrameWidgetImpl::updateLayerTreeDeviceScaleFactor()
 {
     ASSERT(page());
     ASSERT(m_layerTreeView);
 
     float deviceScaleFactor = page()->deviceScaleFactor();
     m_layerTreeView->setDeviceScaleFactor(deviceScaleFactor);
 }
 
+void WebFrameWidgetImpl::setIsTransparent(bool isTransparent)
+{
+    m_isTransparent = isTransparent;
+
+    if (m_layerTreeView)
+        m_layerTreeView->setHasTransparentBackground(isTransparent);
+}
+
 bool WebFrameWidgetImpl::isTransparent() const
 {
-    // FIXME: This might need to proxy to the WebView's isTransparent().
-    return false;
+    return m_isTransparent;
 }
 
 void WebFrameWidgetImpl::layoutAndPaintAsync(WebLayoutAndPaintAsyncCallback* callback)
 {
     m_layerTreeView->layoutAndPaintAsync(callback);
 }
 
 void WebFrameWidgetImpl::compositeAndReadbackAsync(WebCompositeAndReadbackAsyncCallback* callback)
 {
     m_layerTreeView->compositeAndReadbackAsync(callback);
@@ skipping 67 matching lines @@
 {
     page()->setIsCursorVisible(isVisible);
 }
 
 bool WebFrameWidgetImpl::hasTouchEventHandlersAt(const WebPoint& point)
 {
     // FIXME: Implement this. Note that the point must be divided by pageScaleFactor.
     return true;
 }
 
+void WebFrameWidgetImpl::setBaseBackgroundColor(WebColor color)
+{
+    if (m_baseBackgroundColor == color)
+        return;
+
+    m_baseBackgroundColor = color;
+
+    m_localRoot->frameView()->setBaseBackgroundColor(color);
+
+    updateAllLifecyclePhases();
+}
+
 void WebFrameWidgetImpl::scheduleAnimation()
 {
     if (m_layerTreeView) {
         m_layerTreeView->setNeedsBeginFrame();
         return;
     }
     if (m_client)
         m_client->scheduleAnimation();
 }
 
@@ skipping 82 matching lines @@
 WebTextInputType WebFrameWidgetImpl::textInputType()
 {
     return view()->textInputType();
 }
 
 WebColor WebFrameWidgetImpl::backgroundColor() const
 {
     if (isTransparent())
         return Color::transparent;
     if (!m_localRoot->frameView())
-        return view()->backgroundColor();
+        return m_baseBackgroundColor;
     FrameView* view = m_localRoot->frameView();
     return view->documentBackgroundColor().rgb();
 }
 
 bool WebFrameWidgetImpl::selectionBounds(WebRect& anchor, WebRect& focus) const
 {
     const Frame* frame = focusedCoreFrame();
     if (!frame || !frame->isLocalFrame())
         return false;
 
@@ skipping 585 matching lines @@
 
 HitTestResult WebFrameWidgetImpl::hitTestResultForRootFramePos(const IntPoint& posInRootFrame)
 {
     IntPoint docPoint(m_localRoot->frame()->view()->rootFrameToContents(posInRootFrame));
     HitTestResult result = m_localRoot->frame()->eventHandler().hitTestResultAtPoint(docPoint, HitTestRequest::ReadOnly | HitTestRequest::Active);
     result.setToShadowHostIfInUserAgentShadowRoot();
     return result;
 }
 
 } // namespace blink