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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 "LineWidth.h"
#include "RenderBlockFlow.h"
#include "RenderRubyRun.h"
namespace WebCore {
LineWidth::LineWidth(RenderBlockFlow& block, bool isFirstLine, IndentTextOrNot shouldIndentText)
: m_block(block)
, m_isFirstLine(isFirstLine)
, m_shouldIndentText(shouldIndentText)
{
updateAvailableWidth();
}
bool LineWidth::fitsOnLine(bool ignoringTrailingSpace) const
{
return ignoringTrailingSpace ? fitsOnLineExcludingTrailingCollapsedWhitespace() : fitsOnLineIncludingExtraWidth(0);
}
bool LineWidth::fitsOnLineIncludingExtraWidth(float extra) const
{
auto adjustedCurrentWidth = currentWidth() + extra;
return adjustedCurrentWidth < m_availableWidth || WTF::areEssentiallyEqual(adjustedCurrentWidth, m_availableWidth);
}
bool LineWidth::fitsOnLineExcludingTrailingWhitespace(float extra) const
{
auto adjustedCurrentWidth = currentWidth() - m_trailingWhitespaceWidth + extra;
return adjustedCurrentWidth < m_availableWidth || WTF::areEssentiallyEqual(adjustedCurrentWidth, m_availableWidth);
}
bool LineWidth::fitsOnLineExcludingTrailingCollapsedWhitespace() const
{
auto adjustedCurrentWidth = currentWidth() - m_trailingCollapsedWhitespaceWidth;
return adjustedCurrentWidth < m_availableWidth || WTF::areEssentiallyEqual(adjustedCurrentWidth, m_availableWidth);
}
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);
m_right = m_block.logicalRightOffsetForLine(height, shouldIndentText(), logicalHeight);
computeAvailableWidthFromLeftAndRight();
}
static bool newFloatShrinksLine(const FloatingObject& newFloat, const RenderBlockFlow& block, bool isFirstLine)
{
LayoutUnit blockOffset = block.logicalHeight();
if (blockOffset >= block.logicalTopForFloat(newFloat) && blockOffset < block.logicalBottomForFloat(newFloat))
return true;
// initial-letter float always shrinks the first line.
const auto& style = newFloat.renderer().style();
if (isFirstLine && style.styleType() == PseudoId::FirstLetter && !style.initialLetter().isEmpty())
return true;
return false;
}
void LineWidth::shrinkAvailableWidthForNewFloatIfNeeded(const FloatingObject& newFloat)
{
if (!newFloatShrinksLine(newFloat, m_block, m_isFirstLine))
return;
ShapeOutsideDeltas shapeDeltas;
if (ShapeOutsideInfo* shapeOutsideInfo = newFloat.renderer().shapeOutsideInfo()) {
LayoutUnit lineHeight = m_block.lineHeight(m_isFirstLine, m_block.isHorizontalWritingMode() ? HorizontalLine : VerticalLine, PositionOfInteriorLineBoxes);
shapeDeltas = shapeOutsideInfo->computeDeltasForContainingBlockLine(m_block, newFloat, m_block.logicalHeight(), lineHeight);
}
if (newFloat.type() == FloatingObject::FloatLeft) {
float newLeft = m_block.logicalRightForFloat(newFloat);
if (shouldIndentText() == IndentText && m_block.style().isLeftToRightDirection())
newLeft += floorToInt(m_block.textIndentOffset());
if (shapeDeltas.isValid()) {
if (shapeDeltas.lineOverlapsShape())
newLeft += shapeDeltas.rightMarginBoxDelta();
else // If the line doesn't overlap the shape, then we need to act as if this float didn't exist.
newLeft = m_left;
}
m_left = std::max<float>(m_left, newLeft);
} else {
float newRight = m_block.logicalLeftForFloat(newFloat);
if (shouldIndentText() == IndentText && !m_block.style().isLeftToRightDirection())
newRight -= floorToInt(m_block.textIndentOffset());
if (shapeDeltas.isValid()) {
if (shapeDeltas.lineOverlapsShape())
newRight += shapeDeltas.leftMarginBoxDelta();
else // If the line doesn't overlap the shape, then we need to act as if this float didn't exist.
newRight = m_right;
}
m_right = std::min<float>(m_right, newRight);
}
computeAvailableWidthFromLeftAndRight();
}
void LineWidth::commit()
{
m_committedWidth += m_uncommittedWidth;
m_uncommittedWidth = 0;
if (m_hasUncommittedReplaced) {
m_hasCommittedReplaced = true;
m_hasUncommittedReplaced = false;
}
m_hasCommitted = true;
}
void LineWidth::applyOverhang(const RenderRubyRun& rubyRun, RenderObject* startRenderer, RenderObject* endRenderer)
{
float startOverhang;
float endOverhang;
rubyRun.getOverhang(m_isFirstLine, startRenderer, endRenderer, startOverhang, endOverhang);
startOverhang = std::min(startOverhang, m_committedWidth);
m_availableWidth += startOverhang;
endOverhang = std::max(std::min(endOverhang, m_availableWidth - currentWidth()), 0.0f);
m_availableWidth += endOverhang;
m_overhangWidth += startOverhang + endOverhang;
}
inline static float availableWidthAtOffset(const RenderBlockFlow& block, const LayoutUnit& offset, IndentTextOrNot shouldIndentText,
float& newLineLeft, float& newLineRight, const LayoutUnit& lineHeight = 0)
{
newLineLeft = block.logicalLeftOffsetForLine(offset, shouldIndentText, lineHeight);
newLineRight = block.logicalRightOffsetForLine(offset, shouldIndentText, lineHeight);
return std::max(0.0f, newLineRight - newLineLeft);
}
void LineWidth::updateLineDimension(LayoutUnit newLineTop, LayoutUnit newLineWidth, float newLineLeft, float newLineRight)
{
if (newLineWidth <= m_availableWidth)
return;
m_block.setLogicalHeight(newLineTop);
m_availableWidth = newLineWidth + m_overhangWidth;
m_left = newLineLeft;
m_right = newLineRight;
}
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, lineHeight);
if (newLineWidth >= m_uncommittedWidth)
break;
if (newLineTop >= floatLogicalBottom)
break;
++newLineTop;
}
updateLineDimension(newLineTop, LayoutUnit(newLineWidth), LayoutUnit(newLineLeft), LayoutUnit(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);
if (floatLogicalBottom <= lastFloatLogicalBottom)
break;
newLineWidth = availableWidthAtOffset(m_block, floatLogicalBottom, shouldIndentText(), newLineLeft, newLineRight);
lastFloatLogicalBottom = floatLogicalBottom;
if (newLineWidth >= m_uncommittedWidth)
break;
}
updateLineDimension(lastFloatLogicalBottom, LayoutUnit(newLineWidth), LayoutUnit(newLineLeft), LayoutUnit(newLineRight));
}
void LineWidth::setTrailingWhitespaceWidth(float collapsedWhitespace, float borderPaddingMargin)
{
m_trailingCollapsedWhitespaceWidth = collapsedWhitespace;
m_trailingWhitespaceWidth = collapsedWhitespace + borderPaddingMargin;
}
void LineWidth::computeAvailableWidthFromLeftAndRight()
{
m_availableWidth = std::max<float>(0, m_right - m_left) + m_overhangWidth;
}
IndentTextOrNot requiresIndent(bool isFirstLine, bool isAfterHardLineBreak, const RenderStyle& style)
{
IndentTextOrNot shouldIndentText = DoNotIndentText;
if (isFirstLine)
shouldIndentText = IndentText;
else if (isAfterHardLineBreak && style.textIndentLine() == TextIndentLine::EachLine)
shouldIndentText = IndentText;
if (style.textIndentType() == TextIndentType::Hanging)
shouldIndentText = shouldIndentText == IndentText ? DoNotIndentText : IndentText;
return shouldIndentText;
}
}