Remove CSS regions support, keeping a bare minimum to support "region-based" multicol.

Source/core/rendering/RenderView.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 157 matching lines @@
 
     LayoutRectRecorder recorder(*this);
     RenderBlockFlow::layout();
 
     if (RuntimeEnabledFeatures::dialogElementEnabled())
         positionDialogs();
 
     if (m_frameView->partialLayout().isStopping())
         return;
 
-    if (hasRenderNamedFlowThreads())
-        flowThreadController()->layoutRenderNamedFlowThreads();
-
 #ifndef NDEBUG
     checkLayoutState(state);
 #endif
 }
 
 #ifndef NDEBUG
 void RenderView::checkLayoutState(const LayoutState& state)
 {
     if (!RuntimeEnabledFeatures::repaintAfterLayoutEnabled()) {
         ASSERT(layoutDeltaMatches(LayoutSize()));
     }
     ASSERT(!m_layoutStateDisableCount);
     ASSERT(m_layoutState == &state);
 }
 #endif
 
 void RenderView::initializeLayoutState(LayoutState& state)
 {
     // FIXME: May be better to push a clip and avoid issuing offscreen repaints.
     state.m_clipped = false;
     state.m_pageLogicalHeight = m_pageLogicalHeight;
     state.m_pageLogicalHeightChanged = m_pageLogicalHeightChanged;
     state.m_isPaginated = state.m_pageLogicalHeight;
 }
 
-// The algorithm below assumes this is a full layout. In case there are previously computed values for regions, supplemental steps are taken
-// to ensure the results are the same as those obtained from a full layout (i.e. the auto-height regions from all the flows are marked as needing
-// layout).
-// 1. The flows are laid out from the outer flow to the inner flow. This successfully computes the outer non-auto-height regions size so the
-// inner flows have the necessary information to correctly fragment the content.
-// 2. The flows are laid out from the inner flow to the outer flow. After an inner flow is laid out it goes into the constrained layout phase
-// and marks the auto-height regions they need layout. This means the outer flows will relayout if they depend on regions with auto-height regions
-// belonging to inner flows. This step will correctly set the computedAutoHeight for the auto-height regions. It's possible for non-auto-height
-// regions to relayout if they depend on auto-height regions. This will invalidate the inner flow threads and mark them as needing layout.
-// 3. The last step is to do one last layout if there are pathological dependencies between non-auto-height regions and auto-height regions
-// as detected in the previous step.
-void RenderView::layoutContentInAutoLogicalHeightRegions(const LayoutState& state)
-{
-    if (!m_frameView->partialLayout().isStopping()) {
-        // Disable partial layout for any two-pass layout algorithm.
-        m_frameView->partialLayout().reset();
-    }
-
-    // We need to invalidate all the flows with auto-height regions if one such flow needs layout.
-    // If none is found we do a layout a check back again afterwards.
-    if (!flowThreadController()->updateFlowThreadsNeedingLayout()) {
-        // Do a first layout of the content. In some cases more layouts are not needed (e.g. only flows with non-auto-height regions have changed).
-        layoutContent(state);
-
-        // If we find no named flow needing a two step layout after the first layout, exit early.
-        // Otherwise, initiate the two step layout algorithm and recompute all the flows.
-        if (!flowThreadController()->updateFlowThreadsNeedingTwoStepLayout())
-            return;
-    }
-
-    // Layout to recompute all the named flows with auto-height regions.
-    layoutContent(state);
-
-    // Propagate the computed auto-height values upwards.
-    // Non-auto-height regions may invalidate the flow thread because they depended on auto-height regions, but that's ok.
-    flowThreadController()->updateFlowThreadsIntoConstrainedPhase();
-
-    // Do one last layout that should update the auto-height regions found in the main flow
-    // and solve pathological dependencies between regions (e.g. a non-auto-height region depending
-    // on an auto-height one).
-    if (needsLayout())
-        layoutContent(state);
-}
-
 void RenderView::layout()
 {
     if (!document().paginated())
         setPageLogicalHeight(0);
 
     if (shouldUsePrintingLayout())
         m_minPreferredLogicalWidth = m_maxPreferredLogicalWidth = logicalWidth();
 
     SubtreeLayoutScope layoutScope(this);
 
@@ skipping 19 matching lines @@
     ASSERT(!m_layoutState);
     if (!needsLayout())
         return;
 
     LayoutState state;
     initializeLayoutState(state);
 
     m_pageLogicalHeightChanged = false;
     m_layoutState = &state;
 
-    if (checkTwoPassLayoutForAutoHeightRegions())
-        layoutContentInAutoLogicalHeightRegions(state);
-    else
-        layoutContent(state);
+    layoutContent(state);
 
     if (m_frameView->partialLayout().isStopping()) {
         m_layoutState = 0;
         return;
     }
 
 #ifndef NDEBUG
     checkLayoutState(state);
 #endif
     m_layoutState = 0;
@@ skipping 693 matching lines @@
 
     return m_compositor.get();
 }
 
 void RenderView::setIsInWindow(bool isInWindow)
 {
     if (m_compositor)
         m_compositor->setIsInWindow(isInWindow);
 }
 
-void RenderView::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
-{
-    RenderBlock::styleDidChange(diff, oldStyle);
-    if (hasRenderNamedFlowThreads())
-        flowThreadController()->styleDidChange();
-}
-
-bool RenderView::hasRenderNamedFlowThreads() const
-{
-    return m_flowThreadController && m_flowThreadController->hasRenderNamedFlowThreads();
-}
-
-bool RenderView::checkTwoPassLayoutForAutoHeightRegions() const
-{
-    return hasRenderNamedFlowThreads() && m_flowThreadController->hasFlowThreadsWithAutoLogicalHeightRegions();
-}
-
 FlowThreadController* RenderView::flowThreadController()
 {
     if (!m_flowThreadController)
-        m_flowThreadController = FlowThreadController::create(this);
+        m_flowThreadController = FlowThreadController::create();
 
     return m_flowThreadController.get();
 }
 
 void RenderView::pushLayoutStateForCurrentFlowThread(const RenderObject* object)
 {
     if (!m_flowThreadController)
         return;
 
     RenderFlowThread* currentFlowThread = m_flowThreadController->currentRenderFlowThread();
@@ skipping 37 matching lines @@
     return viewWidth(ScrollableArea::IncludeScrollbars) / scale;
 }
 
 double RenderView::layoutViewportHeight() const
 {
     float scale = m_frameView ? m_frameView->frame().pageZoomFactor() : 1;
     return viewHeight(ScrollableArea::IncludeScrollbars) / scale;
 }
 
 } // namespace WebCore