[css-grid] Avoid computing twice the number of auto-repeat columns

third_party/WebKit/Source/core/layout/LayoutGrid.cpp

 /*
  * Copyright (C) 2011 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 423 matching lines @@
 
         LayoutSize previousSize = size();
 
         updateLogicalWidth();
         bool logicalHeightWasIndefinite = computeContentLogicalHeight(MainOrPreferredSize, style()->logicalHeight(), LayoutUnit(-1)) == LayoutUnit(-1);
 
         TextAutosizer::LayoutScope textAutosizerLayoutScope(this, &layoutScope);
 
         // TODO(svillar): we won't need to do this once the intrinsic width computation is isolated
         // from the LayoutGrid object state (it should not touch any attribute) (see crbug.com/627812)
-        if (m_autoRepeatColumns && m_autoRepeatColumns != computeAutoRepeatTracksCount(ForColumns))
+        size_t autoRepeatColumnsCount = computeAutoRepeatTracksCount(ForColumns);
+        if (m_autoRepeatColumns && m_autoRepeatColumns != autoRepeatColumnsCount)
             dirtyGrid();
-        placeItemsOnGrid(TrackSizing);
+        placeItemsOnGrid(autoRepeatColumnsCount);
 
         GridSizingData sizingData(gridColumnCount(), gridRowCount());
 
         // 1- First, the track sizing algorithm is used to resolve the sizes of the grid columns.
         // At this point the logical width is always definite as the above call to updateLogicalWidth()
         // properly resolves intrinsic sizes. We cannot do the same for heights though because many code
         // paths inside updateLogicalHeight() require a previous call to setLogicalHeight() to resolve
         // heights properly (like for positioned items for example).
         LayoutUnit availableSpaceForColumns = availableLogicalWidth();
         computeTrackSizesForDirection(ForColumns, sizingData, availableSpaceForColumns);
@@ skipping 110 matching lines @@
         }
         if (nonEmptyTracksAfterEndLine)
             gapAccumulator += gap;
     }
 
     return gapAccumulator;
 }
 
 void LayoutGrid::computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const
 {
-    const_cast<LayoutGrid*>(this)->placeItemsOnGrid(IntrinsicSizeComputation);
+    const_cast<LayoutGrid*>(this)->placeItemsOnGrid(styleRef().gridAutoRepeatColumns().size());
 
     GridSizingData sizingData(gridColumnCount(), gridRowCount());
     sizingData.freeSpaceForDirection(ForColumns) = LayoutUnit();
     sizingData.sizingOperation = IntrinsicSizeComputation;
     computeUsedBreadthOfGridTracks(ForColumns, sizingData, minLogicalWidth, maxLogicalWidth);
 
     LayoutUnit totalGuttersSize = guttersSize(ForColumns, 0, sizingData.columnTracks.size());
     minLogicalWidth += totalGuttersSize;
     maxLogicalWidth += totalGuttersSize;
 
@@ skipping 895 matching lines @@
             if (!iterator.nextGridItem()) {
                 if (!emptyTrackIndexes)
                     emptyTrackIndexes = wrapUnique(new OrderedTrackIndexSet);
                 emptyTrackIndexes->add(trackIndex);
             }
         }
     }
     return emptyTrackIndexes;
 }
 
-void LayoutGrid::placeItemsOnGrid(SizingOperation sizingOperation)
+void LayoutGrid::placeItemsOnGrid(size_t autoRepeatColumnsCount)
 {
     if (!m_gridIsDirty)
         return;
 
     ASSERT(m_gridItemArea.isEmpty());
 
-    if (sizingOperation == IntrinsicSizeComputation)
-        m_autoRepeatColumns = styleRef().gridAutoRepeatColumns().size();
-    else
-        m_autoRepeatColumns = computeAutoRepeatTracksCount(ForColumns);
+    m_autoRepeatColumns = autoRepeatColumnsCount;
     m_autoRepeatRows = computeAutoRepeatTracksCount(ForRows);
 
     populateExplicitGridAndOrderIterator();
 
     // We clear the dirty bit here as the grid sizes have been updated.
     m_gridIsDirty = false;
 
     Vector<LayoutBox*> autoMajorAxisAutoGridItems;
     Vector<LayoutBox*> specifiedMajorAxisAutoGridItems;
     m_hasAnyOrthogonalChild = false;
@@ skipping 1074 matching lines @@
     return isOrthogonalChild(child) ? childLocation.transposedPoint() : childLocation;
 }
 
 void LayoutGrid::paintChildren(const PaintInfo& paintInfo, const LayoutPoint& paintOffset) const
 {
     if (!m_gridItemArea.isEmpty())
         GridPainter(*this).paintChildren(paintInfo, paintOffset);
 }
 
 } // namespace blink