[Pinch-to-zoom] Moved scale factor into PinchViewport

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 1551 matching lines @@
 
         updatePageDefinedViewportConstraints(mainFrameImpl()->frame()->document()->viewportDescription());
         updateMainFrameLayoutSize();
 
         WebDevToolsAgentPrivate* agentPrivate = devToolsAgentPrivate();
         if (agentPrivate)
             agentPrivate->webViewResized(newSize);
         WebFrameImpl* webFrame = mainFrameImpl();
         if (webFrame->frameView()) {
             webFrame->frameView()->resize(m_size);
-            if (page()->settings().pinchVirtualViewportEnabled())
-                page()->frameHost().pinchViewport().setSize(m_size);
+            if (pinchVirtualViewportEnabled())
+                page()->frameHost().pinchViewport().mainFrameDidChangeSize();
         }
     }
 
     if (settings()->viewportEnabled() && !m_fixedLayoutSizeLock) {
         // Relayout immediately to recalculate the minimum scale limit.
         if (view->needsLayout())
             view->layout();
 
         if (shouldAnchorAndRescaleViewport) {
             float viewportWidthRatio = static_cast<float>(newSize.width) / oldSize.width;
@@ skipping 1046 matching lines @@
 {
     // Since factor = 1.2^level, level = log(factor) / log(1.2)
     return log(factor) / log(textSizeMultiplierRatio);
 }
 
 float WebViewImpl::pageScaleFactor() const
 {
     if (!page())
         return 1;
 
+    if (pinchVirtualViewportEnabled())
+        return pinchViewportScaleFactor();
+
     return page()->pageScaleFactor();
 }
 
 float WebViewImpl::clampPageScaleFactorToLimits(float scaleFactor) const
 {
     return m_pageScaleConstraintsSet.finalConstraints().clampToConstraints(scaleFactor);
 }
 
 IntPoint WebViewImpl::clampOffsetAtScale(const IntPoint& offset, float scale)
 {
     FrameView* view = mainFrameImpl()->frameView();
     if (!view)
         return offset;
 
     return view->clampOffsetAtScale(offset, scale);
 }
 
+bool WebViewImpl::pinchVirtualViewportEnabled() const
+{
+    ASSERT(page());
+    return page()->settings().pinchVirtualViewportEnabled();
+}
+
+void WebViewImpl::setPinchViewportOffset(const WebFloatPoint& offset)
+{
+    ASSERT(page());
+
+    if (!pinchVirtualViewportEnabled())
+        return;
+
+    page()->frameHost().pinchViewport().setLocation(offset);
+}
+
+WebFloatPoint WebViewImpl::pinchViewportOffset() const
+{
+    ASSERT(page());
+
+    if (!pinchVirtualViewportEnabled())
+        return WebFloatPoint();
+
+    return page()->frameHost().pinchViewport().visibleRect().location();
+}
+
+void WebViewImpl::setPinchViewportScaleFactor(float scaleFactor)
+{
+    ASSERT(page());
+
+    scaleFactor = clampPageScaleFactorToLimits(scaleFactor);
+    if (scaleFactor == pinchViewportScaleFactor())
+        return;
+
+    // TODO(bokan): Old-style pinch path. Remove when we're migrated to
+    // virtual viewport pinch.
+    if (!pinchVirtualViewportEnabled()) {
+        IntPoint scrollOffset(mainFrame()->scrollOffset().width, mainFrame()->scrollOffset().height);
+        setPageScaleFactor(scaleFactor, scrollOffset);
+        return;
+    }
+
+    page()->frameHost().pinchViewport().setScale(scaleFactor);
+    deviceOrPageScaleFactorChanged();
+}
+
+float WebViewImpl::pinchViewportScaleFactor() const
+{
+    if (!pinchVirtualViewportEnabled())
+        return pageScaleFactor();
+
+    if (!page())
+        return 1;
+
+    return page()->frameHost().pinchViewport().scale();
+}
+
+void WebViewImpl::setMainFrameScrollOffset(const WebPoint& origin)
+{
+    updateMainFrameScrollPosition(origin, false);
+}
+
 void WebViewImpl::setPageScaleFactor(float scaleFactor, const WebPoint& origin)
 {
     if (!page())
         return;
 
     IntPoint newScrollOffset = origin;
     scaleFactor = clampPageScaleFactorToLimits(scaleFactor);
     newScrollOffset = clampOffsetAtScale(newScrollOffset, scaleFactor);
 
-    page()->setPageScaleFactor(scaleFactor, newScrollOffset);
+    if (pinchVirtualViewportEnabled())
+        setPinchViewportScaleFactor(scaleFactor);
+    else
+        page()->setPageScaleFactor(scaleFactor, newScrollOffset);
 }
 
-void WebViewImpl::setPageScaleFactorPreservingScrollOffset(float scaleFactor)
-{
-    if (clampPageScaleFactorToLimits(scaleFactor) == pageScaleFactor())
-        return;
-
-    IntPoint scrollOffset(mainFrame()->scrollOffset().width, mainFrame()->scrollOffset().height);
-    setPageScaleFactor(scaleFactor, scrollOffset);
-}
 
 float WebViewImpl::deviceScaleFactor() const
 {
     if (!page())
         return 1;
 
     return page()->deviceScaleFactor();
 }
 
 void WebViewImpl::setDeviceScaleFactor(float scaleFactor)
@@ skipping 81 matching lines @@
         if (view->verticalScrollbar() && !view->verticalScrollbar()->isOverlayScrollbar())
             verticalScrollbarWidth = view->verticalScrollbar()->width();
         m_pageScaleConstraintsSet.adjustFinalConstraintsToContentsSize(m_size, contentsSize(), verticalScrollbarWidth);
     }
 
     float newPageScaleFactor = pageScaleFactor();
     if (m_pageScaleConstraintsSet.needsReset() && m_pageScaleConstraintsSet.finalConstraints().initialScale != -1) {
         newPageScaleFactor = m_pageScaleConstraintsSet.finalConstraints().initialScale;
         m_pageScaleConstraintsSet.setNeedsReset(false);
     }
-    setPageScaleFactorPreservingScrollOffset(newPageScaleFactor);
+    setPinchViewportScaleFactor(newPageScaleFactor);
 
     updateLayerTreeViewport();
 
     // Relayout immediately to avoid violating the rule that needsLayout()
     // isn't set at the end of a layout.
     if (view->needsLayout())
         view->layout();
 }
 
 void WebViewImpl::updatePageDefinedViewportConstraints(const ViewportDescription& description)
@@ skipping 116 matching lines @@
 }
 
 void WebViewImpl::resetSavedScrollAndScaleState()
 {
     m_savedPageScaleFactor = 0;
     m_savedScrollOffset = IntSize();
 }
 
 void WebViewImpl::resetScrollAndScaleState()
 {
-    page()->setPageScaleFactor(1, IntPoint());
+    setPageScaleFactor(1, IntPoint());
 
     // Clear out the values for the current history item. This will prevent the history item from clobbering the
     // value determined during page scale initialization, which may be less than 1.
     page()->mainFrame()->loader().clearScrollPositionAndViewState();
     m_pageScaleConstraintsSet.setNeedsReset(true);
 
     // Clobber saved scales and scroll offsets.
     if (FrameView* view = page()->mainFrame()->document()->view())
         view->cacheCurrentScrollPosition();
     resetSavedScrollAndScaleState();
@@ skipping 681 matching lines @@
         m_client->suppressCompositorScheduling(enable);
 }
 
 bool WebViewImpl::allowsAcceleratedCompositing()
 {
     return !m_compositorCreationFailed;
 }
 
 void WebViewImpl::setRootGraphicsLayer(GraphicsLayer* layer)
 {
-    bool pinchVirtualViewportEnabled = page()->settings().pinchVirtualViewportEnabled();
     suppressInvalidations(true);
 
-    if (pinchVirtualViewportEnabled) {
+    if (pinchVirtualViewportEnabled()) {
         PinchViewport& pinchViewport = page()->frameHost().pinchViewport();
         pinchViewport.attachToLayerTree(layer, graphicsLayerFactory());
-        pinchViewport.setSize(mainFrameImpl()->frame()->view()->frameRect().size());
         if (layer) {
             m_rootGraphicsLayer = pinchViewport.rootGraphicsLayer();
             m_rootLayer = pinchViewport.rootGraphicsLayer()->platformLayer();
             m_rootTransformLayer = 0;
         } else {
             m_rootGraphicsLayer = 0;
             m_rootLayer = 0;
             m_rootTransformLayer = 0;
         }
     } else {
         m_rootGraphicsLayer = layer;
         m_rootLayer = layer ? layer->platformLayer() : 0;
         m_rootTransformLayer = 0;
     }
 
     setIsAcceleratedCompositingActive(layer);
 
     updateRootLayerTransform();
 
     if (m_layerTreeView) {
         if (m_rootLayer) {
             m_layerTreeView->setRootLayer(*m_rootLayer);
             // We register viewport layers here since there may not be a layer
             // tree view prior to this point.
-            if (pinchVirtualViewportEnabled) {
+            if (pinchVirtualViewportEnabled()) {
                 page()->frameHost().pinchViewport().registerLayersWithTreeView(m_layerTreeView);
             } else {
                 GraphicsLayer* rootScrollLayer = compositor()->scrollLayer();
                 ASSERT(rootScrollLayer);
                 WebLayer* pageScaleLayer = rootScrollLayer->parent() ? rootScrollLayer->parent()->platformLayer() : 0;
                 m_layerTreeView->registerViewportLayers(pageScaleLayer, rootScrollLayer->platformLayer(), 0);
             }
         } else {
             m_layerTreeView->clearRootLayer();
-            if (pinchVirtualViewportEnabled)
+            if (pinchVirtualViewportEnabled())
                 page()->frameHost().pinchViewport().clearLayersForTreeView(m_layerTreeView);
             else
                 m_layerTreeView->clearViewportLayers();
         }
     }
 
     suppressInvalidations(false);
 }
 
 void WebViewImpl::scheduleCompositingLayerSync()
@@ skipping 136 matching lines @@
     frameView->setInProgrammaticScroll(programmaticScroll);
     frameView->notifyScrollPositionChanged(scrollPosition);
     frameView->setInProgrammaticScroll(oldProgrammaticScroll);
 }
 
 void WebViewImpl::applyScrollAndScale(const WebSize& scrollDelta, float pageScaleDelta)
 {
     if (!mainFrameImpl() || !mainFrameImpl()->frameView())
         return;
 
-    // With virtual viewport we need only set the scale (see TODO below).
-    if (page()->settings().pinchVirtualViewportEnabled()) {
-        WebSize scrollOffset = mainFrame()->scrollOffset();
-        WebPoint scrollPoint(scrollOffset.width, scrollOffset.height);
-        setPageScaleFactor(pageScaleFactor() * pageScaleDelta, scrollPoint);
-        m_doubleTapZoomPending = false;
+    if (pinchVirtualViewportEnabled()) {
+        if (pageScaleDelta != 1) {
+            // When the virtual viewport is enabled, offsets are already set for us.
+            setPinchViewportScaleFactor(pageScaleFactor() * pageScaleDelta);
+            m_doubleTapZoomPending = false;
+        }
+
         return;
     }
 
     // TODO(bokan): Old pinch path only - virtual viewport pinch scrolls are automatically updated via GraphicsLayer::DidScroll.
     // this should be removed once old pinch is removed.
     if (pageScaleDelta == 1) {
         TRACE_EVENT_INSTANT2("webkit", "WebViewImpl::applyScrollAndScale::scrollBy", "x", scrollDelta.width, "y", scrollDelta.height);
         WebSize webScrollOffset = mainFrame()->scrollOffset();
         IntPoint scrollOffset(webScrollOffset.width + scrollDelta.width, webScrollOffset.height + scrollDelta.height);
         updateMainFrameScrollPosition(scrollOffset, false);
@@ skipping 161 matching lines @@
     const PageScaleConstraints& constraints = m_pageScaleConstraintsSet.pageDefinedConstraints();
 
     if (!mainFrameImpl() || !mainFrameImpl()->frameView())
         return false;
 
     return mainFrameImpl()->frameView()->layoutSize().width() == m_size.width
         || (constraints.minimumScale == constraints.maximumScale && constraints.minimumScale != -1);
 }
 
 } // namespace blink