1 files changed, 214 insertions, 0 deletions
diff --git a/chromium/third_party/WebKit/Source/core/rendering/line/LineWidth.cpp b/chromium/third_party/WebKit/Source/core/rendering/line/LineWidth.cpp
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index 00000000000..1b46843d9f4
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+++ b/chromium/third_party/WebKit/Source/core/rendering/line/LineWidth.cpp
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+/*
+ * Copyright (C) 2013 Adobe Systems Incorporated. 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 documentation and/or other materials
+ *    provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "core/rendering/line/LineWidth.h"
+
+#include "core/rendering/RenderBlock.h"
+#include "core/rendering/RenderRubyRun.h"
+
+namespace WebCore {
+
+LineWidth::LineWidth(RenderBlockFlow& block, bool isFirstLine, IndentTextOrNot shouldIndentText)
+    : m_block(block)
+    , m_uncommittedWidth(0)
+    , m_committedWidth(0)
+    , m_overhangWidth(0)
+    , m_trailingWhitespaceWidth(0)
+    , m_left(0)
+    , m_right(0)
+    , m_availableWidth(0)
+    , m_isFirstLine(isFirstLine)
+    , m_shouldIndentText(shouldIndentText)
+{
+    updateAvailableWidth();
+}
+
+void LineWidth::updateAvailableWidth(LayoutUnit replacedHeight)
+{
+    LayoutUnit height = m_block.logicalHeight();
+    LayoutUnit logicalHeight = m_block.minLineHeightForReplacedRenderer(m_isFirstLine, replacedHeight);
+    m_left = m_block.logicalLeftOffsetForLine(height, shouldIndentText(), logicalHeight).toFloat();
+    m_right = m_block.logicalRightOffsetForLine(height, shouldIndentText(), logicalHeight).toFloat();
+
+    computeAvailableWidthFromLeftAndRight();
+}
+
+void LineWidth::shrinkAvailableWidthForNewFloatIfNeeded(FloatingObject* newFloat)
+{
+    LayoutUnit height = m_block.logicalHeight();
+    if (height < m_block.logicalTopForFloat(newFloat) || height >= m_block.logicalBottomForFloat(newFloat))
+        return;
+
+    ShapeOutsideInfo* shapeOutsideInfo = newFloat->renderer()->shapeOutsideInfo();
+    if (shapeOutsideInfo) {
+        LayoutUnit lineHeight = m_block.lineHeight(m_isFirstLine, m_block.isHorizontalWritingMode() ? HorizontalLine : VerticalLine, PositionOfInteriorLineBoxes);
+        shapeOutsideInfo->updateDeltasForContainingBlockLine(m_block, *newFloat, m_block.logicalHeight(), lineHeight);
+    }
+
+    if (newFloat->type() == FloatingObject::FloatLeft) {
+        float newLeft = m_block.logicalRightForFloat(newFloat).toFloat();
+        if (shapeOutsideInfo) {
+            if (shapeOutsideInfo->lineOverlapsShape())
+                newLeft += shapeOutsideInfo->rightMarginBoxDelta();
+            else // Per the CSS Shapes spec, If the line doesn't overlap the shape, then ignore this shape for this line.
+                newLeft = m_left;
+        }
+        if (shouldIndentText() && m_block.style()->isLeftToRightDirection())
+            newLeft += floorToInt(m_block.textIndentOffset());
+        m_left = std::max<float>(m_left, newLeft);
+    } else {
+        float newRight = m_block.logicalLeftForFloat(newFloat).toFloat();
+        if (shapeOutsideInfo) {
+            if (shapeOutsideInfo->lineOverlapsShape())
+                newRight += shapeOutsideInfo->leftMarginBoxDelta();
+            else // Per the CSS Shapes spec, If the line doesn't overlap the shape, then ignore this shape for this line.
+                newRight = m_right;
+        }
+        if (shouldIndentText() && !m_block.style()->isLeftToRightDirection())
+            newRight -= floorToInt(m_block.textIndentOffset());
+        m_right = std::min<float>(m_right, newRight);
+    }
+
+    computeAvailableWidthFromLeftAndRight();
+}
+
+void LineWidth::commit()
+{
+    m_committedWidth += m_uncommittedWidth;
+    m_uncommittedWidth = 0;
+}
+
+void LineWidth::applyOverhang(RenderRubyRun* rubyRun, RenderObject* startRenderer, RenderObject* endRenderer)
+{
+    int startOverhang;
+    int endOverhang;
+    rubyRun->getOverhang(m_isFirstLine, startRenderer, endRenderer, startOverhang, endOverhang);
+
+    startOverhang = std::min<int>(startOverhang, m_committedWidth);
+    m_availableWidth += startOverhang;
+
+    endOverhang = std::max(std::min<int>(endOverhang, m_availableWidth - currentWidth()), 0);
+    m_availableWidth += endOverhang;
+    m_overhangWidth += startOverhang + endOverhang;
+}
+
+inline static float availableWidthAtOffset(const RenderBlockFlow& block, const LayoutUnit& offset, bool shouldIndentText, float& newLineLeft, float& newLineRight)
+{
+    newLineLeft = block.logicalLeftOffsetForLine(offset, shouldIndentText).toFloat();
+    newLineRight = block.logicalRightOffsetForLine(offset, shouldIndentText).toFloat();
+    return std::max(0.0f, newLineRight - newLineLeft);
+}
+
+inline static float availableWidthAtOffset(const RenderBlockFlow& block, const LayoutUnit& offset, bool shouldIndentText)
+{
+    float newLineLeft = block.logicalLeftOffsetForLine(offset, shouldIndentText).toFloat();
+    float newLineRight = block.logicalRightOffsetForLine(offset, shouldIndentText).toFloat();
+    return std::max(0.0f, newLineRight - newLineLeft);
+}
+
+void LineWidth::updateLineDimension(LayoutUnit newLineTop, LayoutUnit newLineWidth, const float& newLineLeft, const float& newLineRight)
+{
+    if (newLineWidth <= m_availableWidth)
+        return;
+
+    m_block.setLogicalHeight(newLineTop);
+    m_availableWidth = newLineWidth + m_overhangWidth;
+    m_left = newLineLeft;
+    m_right = newLineRight;
+}
+
+inline static bool isWholeLineFit(const RenderBlockFlow& block, const LayoutUnit& lineTop, LayoutUnit lineHeight, float uncommittedWidth, bool shouldIndentText)
+{
+    for (LayoutUnit lineBottom = lineTop; lineBottom <= lineTop + lineHeight; lineBottom++) {
+        LayoutUnit availableWidthAtBottom = availableWidthAtOffset(block, lineBottom, shouldIndentText);
+        if (availableWidthAtBottom < uncommittedWidth)
+            return false;
+    }
+    return true;
+}
+
+void LineWidth::wrapNextToShapeOutside(bool isFirstLine)
+{
+    LayoutUnit lineHeight = m_block.lineHeight(isFirstLine, m_block.isHorizontalWritingMode() ? HorizontalLine : VerticalLine, PositionOfInteriorLineBoxes);
+    LayoutUnit lineLogicalTop = m_block.logicalHeight();
+    LayoutUnit newLineTop = lineLogicalTop;
+    LayoutUnit floatLogicalBottom = m_block.nextFloatLogicalBottomBelow(lineLogicalTop);
+
+    float newLineWidth;
+    float newLineLeft = m_left;
+    float newLineRight = m_right;
+    while (true) {
+        newLineWidth = availableWidthAtOffset(m_block, newLineTop, shouldIndentText(), newLineLeft, newLineRight);
+        if (newLineWidth >= m_uncommittedWidth && isWholeLineFit(m_block, newLineTop, lineHeight, m_uncommittedWidth, shouldIndentText()))
+            break;
+
+        if (newLineTop >= floatLogicalBottom)
+            break;
+
+        newLineTop++;
+    }
+    updateLineDimension(newLineTop, newLineWidth, newLineLeft, newLineRight);
+}
+
+void LineWidth::fitBelowFloats(bool isFirstLine)
+{
+    ASSERT(!m_committedWidth);
+    ASSERT(!fitsOnLine());
+
+    LayoutUnit floatLogicalBottom;
+    LayoutUnit lastFloatLogicalBottom = m_block.logicalHeight();
+    float newLineWidth = m_availableWidth;
+    float newLineLeft = m_left;
+    float newLineRight = m_right;
+
+    FloatingObject* lastFloatFromPreviousLine = (m_block.containsFloats() ? m_block.m_floatingObjects->set().last().get() : 0);
+        if (lastFloatFromPreviousLine && lastFloatFromPreviousLine->renderer()->shapeOutsideInfo())
+            return wrapNextToShapeOutside(isFirstLine);
+
+    while (true) {
+        floatLogicalBottom = m_block.nextFloatLogicalBottomBelow(lastFloatLogicalBottom, ShapeOutsideFloatShapeOffset);
+        if (floatLogicalBottom <= lastFloatLogicalBottom)
+            break;
+
+        newLineWidth = availableWidthAtOffset(m_block, floatLogicalBottom, shouldIndentText(), newLineLeft, newLineRight);
+        lastFloatLogicalBottom = floatLogicalBottom;
+
+        if (newLineWidth >= m_uncommittedWidth)
+            break;
+    }
+    updateLineDimension(lastFloatLogicalBottom, newLineWidth, newLineLeft, newLineRight);
+}
+
+void LineWidth::computeAvailableWidthFromLeftAndRight()
+{
+    m_availableWidth = max(0.0f, m_right - m_left) + m_overhangWidth;
+}
+
+}