Switch line layout to LayoutUnit.

Source/core/layout/LayoutBlockFlowLine.cpp

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All right reserved.
  * Copyright (C) 2010 Google 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.
  *
@@ skipping 277 matching lines @@
         return JUSTIFY;
     case TextAlignLastAuto:
         if (alignment == JUSTIFY)
             return TASTART;
         return alignment;
     }
 
     return alignment;
 }
 
-static void updateLogicalWidthForLeftAlignedBlock(bool isLeftToRightDirection, BidiRun* trailingSpaceRun, float& logicalLeft, float& totalLogicalWidth, float availableLogicalWidth)
+static void updateLogicalWidthForLeftAlignedBlock(bool isLeftToRightDirection, BidiRun* trailingSpaceRun, LayoutUnit& logicalLeft, LayoutUnit totalLogicalWidth, LayoutUnit availableLogicalWidth)
 {
     // The direction of the block should determine what happens with wide lines.
     // In particular with RTL blocks, wide lines should still spill out to the left.
     if (isLeftToRightDirection) {
         if (totalLogicalWidth > availableLogicalWidth && trailingSpaceRun)
-            trailingSpaceRun->m_box->setLogicalWidth(std::max<float>(0, trailingSpaceRun->m_box->logicalWidth() - totalLogicalWidth + availableLogicalWidth));
+            trailingSpaceRun->m_box->setLogicalWidth(std::max(LayoutUnit(), trailingSpaceRun->m_box->logicalWidth() - totalLogicalWidth + availableLogicalWidth));
         return;
     }
 
     if (trailingSpaceRun)
         trailingSpaceRun->m_box->setLogicalWidth(0);
     else if (totalLogicalWidth > availableLogicalWidth)
         logicalLeft -= (totalLogicalWidth - availableLogicalWidth);
 }
 
-static void updateLogicalWidthForRightAlignedBlock(bool isLeftToRightDirection, BidiRun* trailingSpaceRun, float& logicalLeft, float& totalLogicalWidth, float availableLogicalWidth)
+static void updateLogicalWidthForRightAlignedBlock(bool isLeftToRightDirection, BidiRun* trailingSpaceRun, LayoutUnit& logicalLeft, LayoutUnit& totalLogicalWidth, LayoutUnit availableLogicalWidth)
 {
     // Wide lines spill out of the block based off direction.
     // So even if text-align is right, if direction is LTR, wide lines should overflow out of the right
     // side of the block.
     if (isLeftToRightDirection) {
         if (trailingSpaceRun) {
             totalLogicalWidth -= trailingSpaceRun->m_box->logicalWidth();
             trailingSpaceRun->m_box->setLogicalWidth(0);
         }
         if (totalLogicalWidth < availableLogicalWidth)
             logicalLeft += availableLogicalWidth - totalLogicalWidth;
         return;
     }
 
     if (totalLogicalWidth > availableLogicalWidth && trailingSpaceRun) {
-        trailingSpaceRun->m_box->setLogicalWidth(std::max<float>(0, trailingSpaceRun->m_box->logicalWidth() - totalLogicalWidth + availableLogicalWidth));
+        trailingSpaceRun->m_box->setLogicalWidth(std::max(LayoutUnit(), trailingSpaceRun->m_box->logicalWidth() - totalLogicalWidth + availableLogicalWidth));
         totalLogicalWidth -= trailingSpaceRun->m_box->logicalWidth();
     } else {
         logicalLeft += availableLogicalWidth - totalLogicalWidth;
     }
 }
 
-static void updateLogicalWidthForCenterAlignedBlock(bool isLeftToRightDirection, BidiRun* trailingSpaceRun, float& logicalLeft, float& totalLogicalWidth, float availableLogicalWidth)
+static void updateLogicalWidthForCenterAlignedBlock(bool isLeftToRightDirection, BidiRun* trailingSpaceRun, LayoutUnit& logicalLeft, LayoutUnit& totalLogicalWidth, LayoutUnit availableLogicalWidth)
 {
-    float trailingSpaceWidth = 0;
+    LayoutUnit trailingSpaceWidth;
     if (trailingSpaceRun) {
         totalLogicalWidth -= trailingSpaceRun->m_box->logicalWidth();
-        trailingSpaceWidth = std::min(trailingSpaceRun->m_box->logicalWidth().toFloat(), (availableLogicalWidth - totalLogicalWidth + 1) / 2);
-        trailingSpaceRun->m_box->setLogicalWidth(std::max<float>(0, trailingSpaceWidth));
+        trailingSpaceWidth = std::min(trailingSpaceRun->m_box->logicalWidth(), (availableLogicalWidth - totalLogicalWidth + 1) / 2);
+        trailingSpaceRun->m_box->setLogicalWidth(std::max(LayoutUnit(), trailingSpaceWidth));
     }
     if (isLeftToRightDirection)
-        logicalLeft += std::max<float>((availableLogicalWidth - totalLogicalWidth) / 2, 0);
+        logicalLeft += std::max((availableLogicalWidth - totalLogicalWidth) / 2, LayoutUnit());
     else
         logicalLeft += totalLogicalWidth > availableLogicalWidth ? (availableLogicalWidth - totalLogicalWidth) : (availableLogicalWidth - totalLogicalWidth) / 2 - trailingSpaceWidth;
 }
 
 void LayoutBlockFlow::setMarginsForRubyRun(BidiRun* run, LayoutRubyRun* layoutRubyRun, LayoutObject* previousObject, const LineInfo& lineInfo)
 {
     int startOverhang;
     int endOverhang;
     LayoutObject* nextObject = 0;
     for (BidiRun* runWithNextObject = run->next(); runWithNextObject; runWithNextObject = runWithNextObject->next()) {
         if (!runWithNextObject->m_object->isOutOfFlowPositioned() && !runWithNextObject->m_box->isLineBreak()) {
             nextObject = runWithNextObject->m_object;
             break;
         }
     }
     layoutRubyRun->getOverhang(lineInfo.isFirstLine(), layoutRubyRun->style()->isLeftToRightDirection() ? previousObject : nextObject, layoutRubyRun->style()->isLeftToRightDirection() ? nextObject : previousObject, startOverhang, endOverhang);
     setMarginStartForChild(*layoutRubyRun, -startOverhang);
     setMarginEndForChild(*layoutRubyRun, -endOverhang);
 }
 
-static inline void setLogicalWidthForTextRun(RootInlineBox* lineBox, BidiRun* run, LayoutText* layoutText, float xPos, const LineInfo& lineInfo,
+static inline void setLogicalWidthForTextRun(RootInlineBox* lineBox, BidiRun* run, LayoutText* layoutText, LayoutUnit xPos, const LineInfo& lineInfo,
     GlyphOverflowAndFallbackFontsMap& textBoxDataMap, VerticalPositionCache& verticalPositionCache, WordMeasurements& wordMeasurements)
 {
     HashSet<const SimpleFontData*> fallbackFonts;
     GlyphOverflow glyphOverflow;
 
     const Font& font = layoutText->style(lineInfo.isFirstLine())->font();
     // Always compute glyph overflow if the block's line-box-contain value is "glyphs".
     if (lineBox->fitsToGlyphs()) {
         // If we don't stick out of the root line's font box, then don't bother computing our glyph overflow. This optimization
         // will keep us from computing glyph bounds in nearly all cases.
@@ skipping 74 matching lines @@
         run->m_box->parent()->clearDescendantsHaveSameLineHeightAndBaseline();
     }
     if (!glyphOverflow.isZero()) {
         ASSERT(run->m_box->isText());
         GlyphOverflowAndFallbackFontsMap::ValueType* it = textBoxDataMap.add(toInlineTextBox(run->m_box), std::make_pair(Vector<const SimpleFontData*>(), GlyphOverflow())).storedValue;
         it->value.second = glyphOverflow;
         run->m_box->clearKnownToHaveNoOverflow();
     }
 }
 
-static inline void computeExpansionForJustifiedText(BidiRun* firstRun, BidiRun* trailingSpaceRun, Vector<unsigned, 16>& expansionOpportunities, unsigned expansionOpportunityCount, float& totalLogicalWidth, float availableLogicalWidth)
+static inline void computeExpansionForJustifiedText(BidiRun* firstRun, BidiRun* trailingSpaceRun, Vector<unsigned, 16>& expansionOpportunities, unsigned expansionOpportunityCount, LayoutUnit& totalLogicalWidth, LayoutUnit availableLogicalWidth)
 {
     if (!expansionOpportunityCount || availableLogicalWidth <= totalLogicalWidth)
         return;
 
     size_t i = 0;
     for (BidiRun* r = firstRun; r; r = r->next()) {
         if (!r->m_box || r == trailingSpaceRun)
             continue;
 
         if (r->m_object->isText()) {
             unsigned opportunitiesInRun = expansionOpportunities[i++];
 
             ASSERT(opportunitiesInRun <= expansionOpportunityCount);
 
             // Don't justify for white-space: pre.
             if (r->m_object->style()->whiteSpace() != PRE) {
                 InlineTextBox* textBox = toInlineTextBox(r->m_box);
                 int expansion = (availableLogicalWidth - totalLogicalWidth) * opportunitiesInRun / expansionOpportunityCount;
                 textBox->setExpansion(expansion);
                 totalLogicalWidth += expansion;
             }
             expansionOpportunityCount -= opportunitiesInRun;
             if (!expansionOpportunityCount)
                 break;
         }
     }
 }
 
-void LayoutBlockFlow::updateLogicalWidthForAlignment(const ETextAlign& textAlign, const RootInlineBox* rootInlineBox, BidiRun* trailingSpaceRun, float& logicalLeft, float& totalLogicalWidth, float& availableLogicalWidth, unsigned expansionOpportunityCount)
+void LayoutBlockFlow::updateLogicalWidthForAlignment(const ETextAlign& textAlign, const RootInlineBox* rootInlineBox, BidiRun* trailingSpaceRun, LayoutUnit& logicalLeft, LayoutUnit& totalLogicalWidth, LayoutUnit& availableLogicalWidth, unsigned expansionOpportunityCount)
 {
     TextDirection direction;
     if (rootInlineBox && rootInlineBox->layoutObject().style()->unicodeBidi() == Plaintext)
         direction = rootInlineBox->direction();
     else
         direction = style()->direction();
 
     // Armed with the total width of the line (without justification),
     // we now examine our text-align property in order to determine where to position the
     // objects horizontally. The total width of the line can be increased if we end up
@@ skipping 31 matching lines @@
         if (direction == LTR)
             updateLogicalWidthForRightAlignedBlock(style()->isLeftToRightDirection(), trailingSpaceRun, logicalLeft, totalLogicalWidth, availableLogicalWidth);
         else
             updateLogicalWidthForLeftAlignedBlock(style()->isLeftToRightDirection(), trailingSpaceRun, logicalLeft, totalLogicalWidth, availableLogicalWidth);
         break;
     }
     if (style()->shouldPlaceBlockDirectionScrollbarOnLogicalLeft())
         logicalLeft += verticalScrollbarWidth();
 }
 
-static void updateLogicalInlinePositions(LayoutBlockFlow* block, float& lineLogicalLeft, float& lineLogicalRight, float& availableLogicalWidth, bool firstLine, IndentTextOrNot shouldIndentText, LayoutUnit boxLogicalHeight)
+static void updateLogicalInlinePositions(LayoutBlockFlow* block, LayoutUnit& lineLogicalLeft, LayoutUnit& lineLogicalRight, LayoutUnit& availableLogicalWidth, bool firstLine, IndentTextOrNot shouldIndentText, LayoutUnit boxLogicalHeight)
 {
     LayoutUnit lineLogicalHeight = block->minLineHeightForReplacedObject(firstLine, boxLogicalHeight);
-    lineLogicalLeft = block->logicalLeftOffsetForLine(block->logicalHeight(), shouldIndentText == IndentText, lineLogicalHeight).toFloat();
-    lineLogicalRight = block->logicalRightOffsetForLine(block->logicalHeight(), shouldIndentText == IndentText, lineLogicalHeight).toFloat();
+    lineLogicalLeft = block->logicalLeftOffsetForLine(block->logicalHeight(), shouldIndentText == IndentText, lineLogicalHeight);
+    lineLogicalRight = block->logicalRightOffsetForLine(block->logicalHeight(), shouldIndentText == IndentText, lineLogicalHeight);
     availableLogicalWidth = lineLogicalRight - lineLogicalLeft;
 }
 
 void LayoutBlockFlow::computeInlineDirectionPositionsForLine(RootInlineBox* lineBox, const LineInfo& lineInfo, BidiRun* firstRun, BidiRun* trailingSpaceRun, bool reachedEnd,
     GlyphOverflowAndFallbackFontsMap& textBoxDataMap, VerticalPositionCache& verticalPositionCache, WordMeasurements& wordMeasurements)
 {
     ETextAlign textAlign = textAlignmentForLine(!reachedEnd && !lineBox->endsWithBreak());
 
     // CSS 2.1: "'Text-indent' only affects a line if it is the first formatted line of an element. For example, the first line of an anonymous block
     // box is only affected if it is the first child of its parent element."
     // CSS3 "text-indent", "each-line" affects the first line of the block container as well as each line after a forced line break,
     // but does not affect lines after a soft wrap break.
     bool isFirstLine = lineInfo.isFirstLine() && !(isAnonymousBlock() && parent()->slowFirstChild() != this);
     bool isAfterHardLineBreak = lineBox->prevRootBox() && lineBox->prevRootBox()->endsWithBreak();
     IndentTextOrNot shouldIndentText = requiresIndent(isFirstLine, isAfterHardLineBreak, styleRef());
-    float lineLogicalLeft;
-    float lineLogicalRight;
-    float availableLogicalWidth;
+    LayoutUnit lineLogicalLeft;
+    LayoutUnit lineLogicalRight;
+    LayoutUnit availableLogicalWidth;
     updateLogicalInlinePositions(this, lineLogicalLeft, lineLogicalRight, availableLogicalWidth, isFirstLine, shouldIndentText, 0);
     bool needsWordSpacing;
 
     if (firstRun && firstRun->m_object->isReplaced()) {
         LayoutBox* layoutBox = toLayoutBox(firstRun->m_object);
         updateLogicalInlinePositions(this, lineLogicalLeft, lineLogicalRight, availableLogicalWidth, isFirstLine, shouldIndentText, layoutBox->logicalHeight());
     }
 
     computeInlineDirectionPositionsForSegment(lineBox, lineInfo, textAlign, lineLogicalLeft, availableLogicalWidth, firstRun, trailingSpaceRun, textBoxDataMap, verticalPositionCache, wordMeasurements);
     // The widths of all runs are now known. We can now place every inline box (and
     // compute accurate widths for the inline flow boxes).
     needsWordSpacing = lineBox->isLeftToRightDirection() ? false: true;
     lineBox->placeBoxesInInlineDirection(lineLogicalLeft, needsWordSpacing);
 }
 
-BidiRun* LayoutBlockFlow::computeInlineDirectionPositionsForSegment(RootInlineBox* lineBox, const LineInfo& lineInfo, ETextAlign textAlign, float& logicalLeft,
-    float& availableLogicalWidth, BidiRun* firstRun, BidiRun* trailingSpaceRun, GlyphOverflowAndFallbackFontsMap& textBoxDataMap, VerticalPositionCache& verticalPositionCache,
+BidiRun* LayoutBlockFlow::computeInlineDirectionPositionsForSegment(RootInlineBox* lineBox, const LineInfo& lineInfo, ETextAlign textAlign, LayoutUnit& logicalLeft,
+    LayoutUnit& availableLogicalWidth, BidiRun* firstRun, BidiRun* trailingSpaceRun, GlyphOverflowAndFallbackFontsMap& textBoxDataMap, VerticalPositionCache& verticalPositionCache,
     WordMeasurements& wordMeasurements)
 {
     bool needsWordSpacing = true;
-    float totalLogicalWidth = lineBox->getFlowSpacingLogicalWidth().toFloat();
+    LayoutUnit totalLogicalWidth = lineBox->getFlowSpacingLogicalWidth();
     unsigned expansionOpportunityCount = 0;
     bool isAfterExpansion = true;
     Vector<unsigned, 16> expansionOpportunities;
     LayoutObject* previousObject = 0;
     TextJustify textJustify = style()->textJustify();
 
     BidiRun* r = firstRun;
     for (; r; r = r->next()) {
         if (!r->m_box || r->m_object->isOutOfFlowPositioned() || r->m_box->isLineBreak()) {
             continue; // Positioned objects are only participating to figure out their
@@ skipping 540 matching lines @@
     if (endOfInline) {
         return getBPMWidth(child.marginEnd(), childStyle.marginEnd()) +
             getBPMWidth(child.paddingEnd(), childStyle.paddingEnd()) +
             child.borderEnd();
     }
     return getBPMWidth(child.marginStart(), childStyle.marginStart()) +
         getBPMWidth(child.paddingStart(), childStyle.paddingStart()) +
         child.borderStart();
 }
 
-static inline void stripTrailingSpace(FloatWillBeLayoutUnit& inlineMax, FloatWillBeLayoutUnit& inlineMin,
+static inline void stripTrailingSpace(LayoutUnit& inlineMax, LayoutUnit& inlineMin,
     LayoutObject* trailingSpaceChild)
 {
     if (trailingSpaceChild && trailingSpaceChild->isText()) {
         // Collapse away the trailing space at the end of a block by finding
         // the first white-space character and subtracting its width. Subsequent
         // white-space characters have been collapsed into the first one (which
         // can be either a space or a tab character).
         LayoutText* text = toLayoutText(trailingSpaceChild);
         UChar trailingWhitespaceChar = ' ';
         for (unsigned i = text->textLength(); i > 0; i--) {
@@ skipping 23 matching lines @@
 // pure float accumulation.
 static inline LayoutUnit adjustFloatForSubPixelLayout(float value)
 {
     return LayoutUnit::fromFloatCeil(value);
 }
 
 // FIXME: This function should be broken into something less monolithic.
 // FIXME: The main loop here is very similar to LineBreaker::nextSegmentBreak. They can probably reuse code.
 void LayoutBlockFlow::computeInlinePreferredLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth)
 {
-    FloatWillBeLayoutUnit inlineMax;
-    FloatWillBeLayoutUnit inlineMin;
+    LayoutUnit inlineMax;
+    LayoutUnit inlineMin;
 
     const ComputedStyle& styleToUse = styleRef();
     LayoutBlock* containingBlock = this->containingBlock();
     LayoutUnit cw = containingBlock ? containingBlock->contentLogicalWidth() : LayoutUnit();
 
     // If we are at the start of a line, we want to ignore all white-space.
     // Also strip spaces if we previously had text that ended in a trailing space.
     bool stripFrontSpaces = true;
     LayoutObject* trailingSpaceChild = 0;
 
@@ skipping 50 matching lines @@
             // terminate our current line (unless we're already in a whitespace stripping
             // mode.
             //
             // If the text string has a breakable character in the middle, but didn't start
             // with whitespace, then we add the width of the first non-breakable run and
             // then end the current line. We then need to use the intermediate min/max width
             // values (if any of them are larger than our current min/max). We then look at
             // the width of the last non-breakable run and use that to start a new line
             // (unless we end in whitespace).
             const ComputedStyle& childStyle = child->styleRef();
-            FloatWillBeLayoutUnit childMin;
-            FloatWillBeLayoutUnit childMax;
+            LayoutUnit childMin;
+            LayoutUnit childMax;
 
             if (!child->isText()) {
                 // Case (1) and (2). Inline replaced and inline flow elements.
                 if (child->isLayoutInline()) {
                     // Add in padding/border/margin from the appropriate side of
                     // the element.
-                    FloatWillBeLayoutUnit bpm = getBorderPaddingMargin(toLayoutInline(*child), childIterator.endOfInline);
+                    LayoutUnit bpm = getBorderPaddingMargin(toLayoutInline(*child), childIterator.endOfInline);
                     childMin += bpm;
                     childMax += bpm;
 
                     inlineMin += childMin;
                     inlineMax += childMax;
 
                     child->clearPreferredLogicalWidthsDirty();
                 } else {
                     // Inline replaced elts add in their margins to their min/max values.
                     LayoutUnit margins;
@@ skipping 30 matching lines @@
                     clearPreviousFloat = (prevFloat
                         && ((prevFloat->styleRef().floating() == LeftFloat && (childStyle.clear() & CLEFT))
                             || (prevFloat->styleRef().floating() == RightFloat && (childStyle.clear() & CRIGHT))));
                     prevFloat = child;
                 } else {
                     clearPreviousFloat = false;
                 }
 
                 bool canBreakReplacedElement = !child->isImage() || allowImagesToBreak;
                 if ((canBreakReplacedElement && (autoWrap || oldAutoWrap) && (!isPrevChildInlineFlow || shouldBreakLineAfterText)) || clearPreviousFloat) {
-                    minLogicalWidth = std::max(minLogicalWidth, inlineMin.toLayoutUnit());
-                    inlineMin = FloatWillBeLayoutUnit();
+                    minLogicalWidth = std::max(minLogicalWidth, inlineMin);
+                    inlineMin = LayoutUnit();
                 }
 
                 // If we're supposed to clear the previous float, then terminate maxwidth as well.
                 if (clearPreviousFloat) {
-                    maxLogicalWidth = std::max(maxLogicalWidth, inlineMax.toLayoutUnit());
-                    inlineMax = FloatWillBeLayoutUnit();
+                    maxLogicalWidth = std::max(maxLogicalWidth, inlineMax);
+                    inlineMax = LayoutUnit();
                 }
 
                 // Add in text-indent. This is added in only once.
                 if (!addedTextIndent && !child->isFloating()) {
                     childMin += textIndent;
                     childMax += textIndent;
 
-                    if (childMin < FloatWillBeLayoutUnit())
+                    if (childMin < LayoutUnit())
                         textIndent = childMin;
                     else
                         addedTextIndent = true;
                 }
 
                 // Add our width to the max.
-                inlineMax += std::max(FloatWillBeLayoutUnit(), childMax);
+                inlineMax += std::max(LayoutUnit(), childMax);
 
                 if (!autoWrap || !canBreakReplacedElement || (isPrevChildInlineFlow && !shouldBreakLineAfterText)) {
                     if (child->isFloating())
-                        minLogicalWidth = std::max(minLogicalWidth, childMin.toLayoutUnit());
+                        minLogicalWidth = std::max(minLogicalWidth, childMin);
                     else
                         inlineMin += childMin;
                 } else {
                     // Now check our line.
-                    minLogicalWidth = std::max(minLogicalWidth, childMin.toLayoutUnit());
+                    minLogicalWidth = std::max(minLogicalWidth, childMin);
 
                     // Now start a new line.
-                    inlineMin = FloatWillBeLayoutUnit();
+                    inlineMin = LayoutUnit();
                 }
 
                 if (autoWrap && canBreakReplacedElement && isPrevChildInlineFlow) {
-                    minLogicalWidth = std::max(minLogicalWidth, inlineMin.toLayoutUnit());
-                    inlineMin = FloatWillBeLayoutUnit();
+                    minLogicalWidth = std::max(minLogicalWidth, inlineMin);
+                    inlineMin = LayoutUnit();
                 }
 
                 // We are no longer stripping whitespace at the start of
                 // a line.
                 if (!child->isFloating()) {
                     stripFrontSpaces = false;
                     trailingSpaceChild = 0;
                 }
             } else if (child->isText()) {
                 // Case (3). Text.
                 LayoutText* t = toLayoutText(child);
 
                 if (t->isWordBreak()) {
-                    minLogicalWidth = std::max(minLogicalWidth, inlineMin.toLayoutUnit());
-                    inlineMin = FloatWillBeLayoutUnit();
+                    minLogicalWidth = std::max(minLogicalWidth, inlineMin);
+                    inlineMin = LayoutUnit();
                     continue;
                 }
 
                 // Determine if we have a breakable character. Pass in
                 // whether or not we should ignore any spaces at the front
                 // of the string. If those are going to be stripped out,
                 // then they shouldn't be considered in the breakable char
                 // check.
                 bool hasBreakableChar, hasBreak;
-                FloatWillBeLayoutUnit firstLineMinWidth, lastLineMinWidth;
+                LayoutUnit firstLineMinWidth, lastLineMinWidth;
                 bool hasBreakableStart, hasBreakableEnd;
-                FloatWillBeLayoutUnit firstLineMaxWidth, lastLineMaxWidth;
+                LayoutUnit firstLineMaxWidth, lastLineMaxWidth;
                 t->trimmedPrefWidths(inlineMax,
                     firstLineMinWidth, hasBreakableStart, lastLineMinWidth, hasBreakableEnd,
                     hasBreakableChar, hasBreak, firstLineMaxWidth, lastLineMaxWidth,
                     childMin, childMax, stripFrontSpaces, styleToUse.direction());
 
                 // This text object will not be layed out, but it may still provide a breaking opportunity.
                 if (!hasBreak && !childMax) {
                     if (autoWrap && (hasBreakableStart || hasBreakableEnd)) {
-                        minLogicalWidth = std::max(minLogicalWidth, inlineMin.toLayoutUnit());
-                        inlineMin = FloatWillBeLayoutUnit();
+                        minLogicalWidth = std::max(minLogicalWidth, inlineMin);
+                        inlineMin = LayoutUnit();
                     }
                     continue;
                 }
 
                 if (stripFrontSpaces)
                     trailingSpaceChild = child;
                 else
                     trailingSpaceChild = 0;
 
                 // Add in text-indent. This is added in only once.
-                FloatWillBeLayoutUnit ti;
+                LayoutUnit ti;
                 if (!addedTextIndent || hasRemainingNegativeTextIndent) {
                     ti = textIndent;
                     childMin += ti;
                     firstLineMinWidth += ti;
 
                     // It the text indent negative and larger than the child minimum, we re-use the remainder
                     // in future minimum calculations, but using the negative value again on the maximum
                     // will lead to under-counting the max pref width.
                     if (!addedTextIndent) {
                         childMax += ti;
                         firstLineMaxWidth += ti;
                         addedTextIndent = true;
                     }
 
-                    if (childMin < FloatWillBeLayoutUnit()) {
+                    if (childMin < LayoutUnit()) {
                         textIndent = childMin;
                         hasRemainingNegativeTextIndent = true;
                     }
                 }
 
                 // If we have no breakable characters at all,
                 // then this is the easy case. We add ourselves to the current
                 // min and max and continue.
                 if (!hasBreakableChar) {
                     inlineMin += childMin;
                 } else {
                     if (hasBreakableStart) {
-                        minLogicalWidth = std::max(minLogicalWidth, inlineMin.toLayoutUnit());
+                        minLogicalWidth = std::max(minLogicalWidth, inlineMin);
                     } else {
                         inlineMin += firstLineMinWidth;
-                        minLogicalWidth = std::max(minLogicalWidth, inlineMin.toLayoutUnit());
+                        minLogicalWidth = std::max(minLogicalWidth, inlineMin);
                         childMin -= ti;
                     }
 
                     inlineMin = childMin;
 
                     if (hasBreakableEnd) {
-                        minLogicalWidth = std::max(minLogicalWidth, inlineMin.toLayoutUnit());
-                        inlineMin = FloatWillBeLayoutUnit();
+                        minLogicalWidth = std::max(minLogicalWidth, inlineMin);
+                        inlineMin = LayoutUnit();
                         shouldBreakLineAfterText = false;
                     } else {
-                        minLogicalWidth = std::max(minLogicalWidth, inlineMin.toLayoutUnit());
+                        minLogicalWidth = std::max(minLogicalWidth, inlineMin);
                         inlineMin = lastLineMinWidth;
                         shouldBreakLineAfterText = true;
                     }
                 }
 
                 if (hasBreak) {
                     inlineMax += firstLineMaxWidth;
-                    maxLogicalWidth = std::max(maxLogicalWidth, inlineMax.toLayoutUnit());
-                    maxLogicalWidth = std::max(maxLogicalWidth, childMax.toLayoutUnit());
+                    maxLogicalWidth = std::max(maxLogicalWidth, inlineMax);
+                    maxLogicalWidth = std::max(maxLogicalWidth, childMax);
                     inlineMax = lastLineMaxWidth;
                     addedTextIndent = true;
                 } else {
-                    inlineMax += std::max<float>(0, childMax);
+                    inlineMax += std::max(LayoutUnit(), childMax);
                 }
             }
 
             // Ignore spaces after a list marker.
             if (child->isListMarker())
                 stripFrontSpaces = true;
         } else {
-            minLogicalWidth = std::max(minLogicalWidth, inlineMin.toLayoutUnit());
-            maxLogicalWidth = std::max(maxLogicalWidth, inlineMax.toLayoutUnit());
-            inlineMin = inlineMax = FloatWillBeLayoutUnit();
+            minLogicalWidth = std::max(minLogicalWidth, inlineMin);
+            maxLogicalWidth = std::max(maxLogicalWidth, inlineMax);
+            inlineMin = inlineMax = LayoutUnit();
             stripFrontSpaces = true;
             trailingSpaceChild = 0;
             addedTextIndent = true;
         }
 
         if (!child->isText() && child->isLayoutInline())
             isPrevChildInlineFlow = true;
         else
             isPrevChildInlineFlow = false;
 
@@ skipping 411 matching lines @@
 void LayoutBlockFlow::deleteEllipsisLineBoxes()
 {
     ETextAlign textAlign = style()->textAlign();
     bool ltr = style()->isLeftToRightDirection();
     bool firstLine = true;
     for (RootInlineBox* curr = firstRootBox(); curr; curr = curr->nextRootBox()) {
         if (curr->hasEllipsisBox()) {
             curr->clearTruncation();
 
             // Shift the line back where it belongs if we cannot accomodate an ellipsis.
-            float logicalLeft = logicalLeftOffsetForLine(curr->lineTop(), firstLine).toFloat();
-            float availableLogicalWidth = logicalRightOffsetForLine(curr->lineTop(), false) - logicalLeft;
-            float totalLogicalWidth = curr->logicalWidth();
+            LayoutUnit logicalLeft = logicalLeftOffsetForLine(curr->lineTop(), firstLine).toFloat();
+            LayoutUnit availableLogicalWidth = logicalRightOffsetForLine(curr->lineTop(), false) - logicalLeft;
+            LayoutUnit totalLogicalWidth = curr->logicalWidth();
             updateLogicalWidthForAlignment(textAlign, curr, 0, logicalLeft, totalLogicalWidth, availableLogicalWidth, 0);
 
             if (ltr)
                 curr->adjustLogicalPosition((logicalLeft - curr->logicalLeft()), 0);
             else
                 curr->adjustLogicalPosition(-(curr->logicalLeft() - logicalLeft), 0);
         }
         firstLine = false;
     }
 }
@@ skipping 11 matching lines @@
     float ellipsisWidth = (font == firstLineFont) ? firstLineEllipsisWidth : font.width(constructTextRun(this, font, &horizontalEllipsisCharacter, 1, styleRef(), ellipsisDirection));
 
     // For LTR text truncation, we want to get the right edge of our padding box, and then we want to see
     // if the right edge of a line box exceeds that.  For RTL, we use the left edge of the padding box and
     // check the left edge of the line box to see if it is less
     // Include the scrollbar for overflow blocks, which means we want to use "contentWidth()"
     bool ltr = style()->isLeftToRightDirection();
     ETextAlign textAlign = style()->textAlign();
     bool firstLine = true;
     for (RootInlineBox* curr = firstRootBox(); curr; curr = curr->nextRootBox()) {
-        float currLogicalLeft = curr->logicalLeft();
+        LayoutUnit currLogicalLeft = curr->logicalLeft();
         LayoutUnit blockRightEdge = logicalRightOffsetForLine(curr->lineTop(), firstLine);
         LayoutUnit blockLeftEdge = logicalLeftOffsetForLine(curr->lineTop(), firstLine);
         LayoutUnit lineBoxEdge = ltr ? currLogicalLeft + curr->logicalWidth() : currLogicalLeft;
         if ((ltr && lineBoxEdge > blockRightEdge) || (!ltr && lineBoxEdge < blockLeftEdge)) {
             // This line spills out of our box in the appropriate direction.  Now we need to see if the line
             // can be truncated.  In order for truncation to be possible, the line must have sufficient space to
             // accommodate our truncation string, and no replaced elements (images, tables) can overlap the ellipsis
             // space.
 
             LayoutUnit width = firstLine ? firstLineEllipsisWidth : ellipsisWidth;
             LayoutUnit blockEdge = ltr ? blockRightEdge : blockLeftEdge;
             if (curr->lineCanAccommodateEllipsis(ltr, blockEdge, lineBoxEdge, width)) {
-                float totalLogicalWidth = curr->placeEllipsis(ellipsisStr, ltr, blockLeftEdge.toFloat(), blockRightEdge.toFloat(), width.toFloat());
+                LayoutUnit totalLogicalWidth = curr->placeEllipsis(ellipsisStr, ltr, blockLeftEdge, blockRightEdge, width);
 
-                float logicalLeft = 0; // We are only intersted in the delta from the base position.
-                float availableLogicalWidth = (blockRightEdge - blockLeftEdge).toFloat();
+                LayoutUnit logicalLeft; // We are only interested in the delta from the base position.
+                LayoutUnit availableLogicalWidth = blockRightEdge - blockLeftEdge;
                 updateLogicalWidthForAlignment(textAlign, curr, 0, logicalLeft, totalLogicalWidth, availableLogicalWidth, 0);
                 if (ltr)
                     curr->adjustLogicalPosition(logicalLeft, 0);
                 else
                     curr->adjustLogicalPosition(logicalLeft - (availableLogicalWidth - totalLogicalWidth), 0);
             }
         }
         firstLine = false;
     }
 }
@@ skipping 50 matching lines @@
 }
 
 LayoutUnit LayoutBlockFlow::startAlignedOffsetForLine(LayoutUnit position, bool firstLine)
 {
     ETextAlign textAlign = style()->textAlign();
 
     if (textAlign == TASTART) // FIXME: Handle TAEND here
         return startOffsetForLine(position, firstLine);
 
     // updateLogicalWidthForAlignment() handles the direction of the block so no need to consider it here
-    float totalLogicalWidth = 0;
-    float logicalLeft = logicalLeftOffsetForLine(logicalHeight(), false).toFloat();
-    float availableLogicalWidth = logicalRightOffsetForLine(logicalHeight(), false) - logicalLeft;
+    LayoutUnit totalLogicalWidth;
+    LayoutUnit logicalLeft = logicalLeftOffsetForLine(logicalHeight(), false);
+    LayoutUnit availableLogicalWidth = logicalRightOffsetForLine(logicalHeight(), false) - logicalLeft;
     updateLogicalWidthForAlignment(textAlign, 0, 0, logicalLeft, totalLogicalWidth, availableLogicalWidth, 0);
 
     if (!style()->isLeftToRightDirection())
         return logicalWidth() - logicalLeft;
     return logicalLeft;
 }
 
 }