[DevTools] Use device metrics emulation implemented in content.

Source/web/WebViewImpl.cpp

 /*
  * Copyright (C) 2011, 2012 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 378 matching lines @@
     , m_maximumZoomLevel(zoomFactorToZoomLevel(maxTextSizeMultiplier))
     , m_savedPageScaleFactor(0)
     , m_doubleTapZoomPageScaleFactor(0)
     , m_doubleTapZoomPending(false)
     , m_enableFakePageScaleAnimationForTesting(false)
     , m_fakePageScaleAnimationPageScaleFactor(0)
     , m_fakePageScaleAnimationUseAnchor(false)
     , m_contextMenuAllowed(false)
     , m_doingDragAndDrop(false)
     , m_ignoreInputEvents(false)
+    , m_emulatingDeviceScales(false)

[pfeldman, 2013/09/19 12:46:05]

Initialize floats too.

[dgozman, 2013/09/19 13:59:38]

Done.

     , m_suppressNextKeypressEvent(false)
     , m_imeAcceptEvents(true)
     , m_operationsAllowed(WebDragOperationNone)
     , m_dragOperation(WebDragOperationNone)
     , m_featureSwitchClient(adoptPtr(new ContextFeaturesClientImpl()))
     , m_autofillPopupShowing(false)
     , m_autofillPopup(0)
     , m_isTransparent(false)
     , m_tabsToLinks(false)
     , m_layerTreeView(0)
@@ skipping 2448 matching lines @@
     return page()->deviceScaleFactor();
 }
 
 void WebViewImpl::setDeviceScaleFactor(float scaleFactor)
 {
     if (!page())
         return;
 
     page()->setDeviceScaleFactor(scaleFactor);
 
-    if (m_layerTreeView)
-        m_layerTreeView->setDeviceScaleFactor(scaleFactor);
+    updateLayerTreeDeviceScaleFactor();
 }
 
 bool WebViewImpl::isFixedLayoutModeEnabled() const
 {
     if (!page())
         return false;
 
     Frame* frame = page()->mainFrame();
     if (!frame || !frame->view())
         return false;
@@ skipping 817 matching lines @@
     m_newNavigationLoader = m_page->mainFrame()->loader()->documentLoader();
 #endif
 }
 
 void WebViewImpl::setIgnoreInputEvents(bool newValue)
 {
     ASSERT(m_ignoreInputEvents != newValue);
     m_ignoreInputEvents = newValue;
 }
 
+void WebViewImpl::setDeviceEmulationScales(bool enabled, float deviceScaleFactor, float rootLayerScale)
+{
+    m_emulatingDeviceScales = enabled;
+    m_emulatedDeviceScaleFactor = deviceScaleFactor;
+    m_rootLayerScale = rootLayerScale;
+    updateLayerTreeDeviceScaleFactor();
+    updateRootLayerTransform();
+}
+
 void WebViewImpl::addPageOverlay(WebPageOverlay* overlay, int zOrder)
 {
     if (!m_pageOverlays)
         m_pageOverlays = PageOverlayList::create(this);
 
     m_pageOverlays->add(overlay, zOrder);
 }
 
 void WebViewImpl::removePageOverlay(WebPageOverlay* overlay)
 {
@@ skipping 94 matching lines @@
             m_rootLayer = 0;
             m_pinchViewports->clearViewportLayersForTreeView(m_layerTreeView);
         }
     } else {
         m_rootGraphicsLayer = layer;
         m_rootLayer = layer ? layer->platformLayer() : 0;
     }
 
     setIsAcceleratedCompositingActive(layer);
 
+    updateRootLayerTransform();

[pfeldman, 2013/09/19 12:46:05]

Will this work?:

if (m_emulatingDeviceScales)
    updateRootLayerTransform();

So make sure we don't set identity transform when it is not needed?

[dgozman, 2013/09/19 13:59:38]

What if root layer has transform left from previous emulation? We need to
restore to identity.

+
     if (m_layerTreeView) {
         if (m_rootLayer)
             m_layerTreeView->setRootLayer(*m_rootLayer);
         else
             m_layerTreeView->clearRootLayer();
     }
 
     suppressInvalidations(false);
 }
 
@@ skipping 87 matching lines @@
     } else {
         TRACE_EVENT0("webkit", "WebViewImpl::setIsAcceleratedCompositingActive(true)");
 
         m_client->initializeLayerTreeView();
         m_layerTreeView = m_client->layerTreeView();
         if (m_layerTreeView) {
             m_layerTreeView->setRootLayer(*m_rootLayer);
 
             bool visible = page()->visibilityState() == PageVisibilityStateVisible;
             m_layerTreeView->setVisible(visible);
-            m_layerTreeView->setDeviceScaleFactor(page()->deviceScaleFactor());
+            updateLayerTreeDeviceScaleFactor();
             m_layerTreeView->setPageScaleFactorAndLimits(pageScaleFactor(), minimumPageScaleFactor(), maximumPageScaleFactor());
             m_layerTreeView->setBackgroundColor(backgroundColor());
             m_layerTreeView->setHasTransparentBackground(isTransparent());
             updateLayerTreeViewport();
             m_client->didActivateCompositor(0);
             m_isAcceleratedCompositingActive = true;
             m_compositorCreationFailed = false;
             if (m_pageOverlays)
                 m_pageOverlays->update();
             m_layerTreeView->setShowFPSCounter(m_showFPSCounter);
@@ skipping 64 matching lines @@
 }
 
 void WebViewImpl::updateLayerTreeViewport()
 {
     if (!page() || !m_layerTreeView)
         return;
 
     m_layerTreeView->setPageScaleFactorAndLimits(pageScaleFactor(), minimumPageScaleFactor(), maximumPageScaleFactor());
 }
 
+void WebViewImpl::updateLayerTreeDeviceScaleFactor()
+{
+    if (!page() || !m_layerTreeView)

[pfeldman, 2013/09/19 12:46:05]

Assert these exist instead.

[dgozman, 2013/09/19 13:59:38]

Done.

+        return;
+
+    float deviceScaleFactor = page()->deviceScaleFactor();
+    if (m_emulatingDeviceScales)

[apavlov, 2013/09/19 12:47:57]

float deviceScaleFactor = m_emulatingDeviceScales ? m_emulatedDeviceScaleFactor
: page()->deviceScaleFactor();

[dgozman, 2013/09/19 13:59:38]

Done.

+        deviceScaleFactor = m_emulatedDeviceScaleFactor;
+    m_layerTreeView->setDeviceScaleFactor(deviceScaleFactor);
+}
+
+void WebViewImpl::updateRootLayerTransform()
+{
+    if (m_rootGraphicsLayer) {
+        WebCore::TransformationMatrix transform;
+        if (m_emulatingDeviceScales)
+            transform = transform.scale(m_rootLayerScale);
+        m_rootGraphicsLayer->setTransform(transform);
+    }
+}
+
 void WebViewImpl::selectAutofillSuggestionAtIndex(unsigned listIndex)
 {
     if (m_autofillPopupClient && listIndex < m_autofillPopupClient->getSuggestionsCount())
         m_autofillPopupClient->valueChanged(listIndex);
 }
 
 bool WebViewImpl::detectContentOnTouch(const WebPoint& position)
 {
     HitTestResult touchHit = hitTestResultForWindowPos(position);
 
@@ skipping 92 matching lines @@
     //    the initial viewport width.
     // 2. The author has disabled viewport zoom.
 
     const PageScaleConstraints& constraints = m_pageScaleConstraintsSet.pageDefinedConstraints();
 
     return fixedLayoutSize().width == m_size.width
         || (constraints.minimumScale == constraints.maximumScale && constraints.minimumScale != -1);
 }
 
 } // namespace WebKit