Get the right ascent/descent for the tallest vertically aligned container

third_party/WebKit/Source/core/layout/line/InlineFlowBox.cpp

 /*
  * Copyright (C) 2003, 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,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 442 matching lines @@
 {
     // Use "central" (Ideographic) baseline if writing-mode is vertical-* and text-orientation is not sideways-*.
     // http://dev.w3.org/csswg/css-writing-modes-3/#text-baselines
     if (!isHorizontal() && getLineLayoutItem().style(isFirstLineStyle())->getFontDescription().isVerticalAnyUpright())
         return IdeographicBaseline;
     return AlphabeticBaseline;
 }
 
 void InlineFlowBox::adjustMaxAscentAndDescent(int& maxAscent, int& maxDescent, int maxPositionTop, int maxPositionBottom)
 {
+    int originalMaxAscent = maxAscent;
+    int originalMaxDescent = maxDescent;
     for (InlineBox* curr = firstChild(); curr; curr = curr->nextOnLine()) {
         // The computed lineheight needs to be extended for the
         // positioned elements
         if (curr->getLineLayoutItem().isOutOfFlowPositioned())
             continue; // Positioned placeholders don't affect calculations.
         if (curr->verticalAlign() == VerticalAlignTop || curr->verticalAlign() == VerticalAlignBottom) {
-            int lineHeight = curr->lineHeight();
+            int lineHeight = curr->lineHeight().round();
             if (curr->verticalAlign() == VerticalAlignTop) {
                 if (maxAscent + maxDescent < lineHeight)
                     maxDescent = lineHeight - maxAscent;
             } else {
                 if (maxAscent + maxDescent < lineHeight)
                     maxAscent = lineHeight - maxDescent;
             }
 
             if (maxAscent + maxDescent >= std::max(maxPositionTop, maxPositionBottom))
                 break;
+            maxAscent = originalMaxAscent;
+            maxDescent = originalMaxDescent;
         }
 
         if (curr->isInlineFlowBox())
             toInlineFlowBox(curr)->adjustMaxAscentAndDescent(maxAscent, maxDescent, maxPositionTop, maxPositionBottom);
     }
 }
 
 void InlineFlowBox::computeLogicalBoxHeights(RootInlineBox* rootBox, LayoutUnit& maxPositionTop, LayoutUnit& maxPositionBottom, int& maxAscent, int& maxDescent, bool& setMaxAscent, bool& setMaxDescent, bool noQuirksMode, GlyphOverflowAndFallbackFontsMap& textBoxDataMap, FontBaseline baselineType, VerticalPositionCache& verticalPositionCache)
 {
     // The primary purpose of this function is to compute the maximal ascent and descent values for
@@ skipping 823 matching lines @@
         ASSERT(child->prevOnLine() == prev);
         prev = child;
     }
     ASSERT(prev == m_lastChild);
 #endif
 }
 
 #endif
 
 } // namespace blink