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/*
* Copyright (C) 2014 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
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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 "SimpleLineLayoutResolver.h"
#include "InlineTextBoxStyle.h"
#include "RenderBlockFlow.h"
#include "RenderObject.h"
#include "SimpleLineLayoutFunctions.h"
namespace WebCore {
namespace SimpleLineLayout {
static FloatPoint linePosition(float logicalLeft, float logicalTop)
{
return FloatPoint(logicalLeft, roundf(logicalTop));
}
static FloatSize lineSize(float logicalLeft, float logicalRight, float height)
{
return FloatSize(logicalRight - logicalLeft, height);
}
RunResolver::Run::Run(const Iterator& iterator)
: m_iterator(iterator)
{
}
FloatRect RunResolver::Run::rect() const
{
auto& run = m_iterator.simpleRun();
auto& resolver = m_iterator.resolver();
float baseline = computeBaselinePosition();
FloatPoint position = linePosition(run.logicalLeft, baseline - resolver.m_ascent);
FloatSize size = lineSize(run.logicalLeft, run.logicalRight, resolver.m_ascent + resolver.m_descent + resolver.m_visualOverflowOffset);
bool moveLineBreakToBaseline = false;
if (run.start == run.end && m_iterator != resolver.begin() && m_iterator.inQuirksMode()) {
auto previousRun = m_iterator;
--previousRun;
moveLineBreakToBaseline = !previousRun.simpleRun().isEndOfLine;
}
if (moveLineBreakToBaseline)
return FloatRect(FloatPoint(position.x(), baseline), FloatSize(size.width(), std::max<float>(0, resolver.m_ascent - resolver.m_baseline.toFloat())));
return FloatRect(position, size);
}
StringView RunResolver::Run::text() const
{
auto& run = m_iterator.simpleRun();
ASSERT(run.start < run.end);
auto& segment = m_iterator.resolver().m_flowContents.segmentForRun(run.start, run.end);
// We currently split runs on segment boundaries (different RenderObject).
ASSERT(run.end <= segment.end);
return StringView(segment.text).substring(run.start - segment.start, run.end - run.start);
}
RunResolver::Iterator::Iterator(const RunResolver& resolver, unsigned runIndex, unsigned lineIndex)
: m_resolver(resolver)
, m_runIndex(runIndex)
, m_lineIndex(lineIndex)
{
}
RunResolver::Iterator& RunResolver::Iterator::advance()
{
if (simpleRun().isEndOfLine)
++m_lineIndex;
++m_runIndex;
return *this;
}
RunResolver::Iterator& RunResolver::Iterator::advanceLines(unsigned lineCount)
{
unsigned runCount = m_resolver.m_layout.runCount();
if (runCount == m_resolver.m_layout.lineCount()) {
m_runIndex = std::min(runCount, m_runIndex + lineCount);
m_lineIndex = m_runIndex;
return *this;
}
unsigned target = m_lineIndex + lineCount;
while (m_lineIndex < target && m_runIndex < runCount)
advance();
return *this;
}
RunResolver::RunResolver(const RenderBlockFlow& flow, const Layout& layout)
: m_flowRenderer(flow)
, m_layout(layout)
, m_flowContents(flow)
, m_lineHeight(lineHeightFromFlow(flow))
, m_baseline(baselineFromFlow(flow))
, m_borderAndPaddingBefore(flow.borderAndPaddingBefore())
, m_ascent(flow.style().fontCascade().fontMetrics().ascent())
, m_descent(flow.style().fontCascade().fontMetrics().descent())
, m_visualOverflowOffset(visualOverflowForDecorations(flow.style(), nullptr).bottom)
, m_inQuirksMode(flow.document().inQuirksMode())
{
}
unsigned RunResolver::lineIndexForHeight(LayoutUnit height, IndexType type) const
{
ASSERT(m_lineHeight);
float y = height - m_borderAndPaddingBefore;
// Lines may overlap, adjust to get the first or last line at this height.
if (type == IndexType::First)
y += m_lineHeight - (m_baseline + m_descent);
else
y -= m_baseline - m_ascent;
y = std::max<float>(y, 0);
return std::min<unsigned>(y / m_lineHeight, m_layout.lineCount() - 1);
}
Range<RunResolver::Iterator> RunResolver::rangeForRect(const LayoutRect& rect) const
{
if (!m_lineHeight)
return Range<Iterator>(begin(), end());
unsigned firstLine = lineIndexForHeight(rect.y(), IndexType::First);
unsigned lastLine = std::max(firstLine, lineIndexForHeight(rect.maxY(), IndexType::Last));
auto rangeBegin = begin().advanceLines(firstLine);
if (rangeBegin == end())
return Range<Iterator>(end(), end());
auto rangeEnd = rangeBegin;
ASSERT(lastLine >= firstLine);
rangeEnd.advanceLines(lastLine - firstLine + 1);
return Range<Iterator>(rangeBegin, rangeEnd);
}
Range<RunResolver::Iterator> RunResolver::rangeForRenderer(const RenderObject& renderer) const
{
if (begin() == end())
return Range<Iterator>(end(), end());
FlowContents::Iterator segment = m_flowContents.begin();
auto run = begin();
ASSERT(segment->start <= (*run).start());
// Move run to the beginning of the segment.
while (&segment->renderer != &renderer && run != end()) {
if ((*run).start() == segment->start && (*run).end() == segment->end) {
++run;
++segment;
} else if ((*run).start() < segment->end)
++run;
else
++segment;
ASSERT(segment != m_flowContents.end());
}
// Do we actually have a run for this renderer?
// Collapsed whitespace with dedicated renderer could end up with no run at all.
if (run == end() || (segment->start != segment->end && segment->end <= (*run).start()))
return Range<Iterator>(end(), end());
auto rangeBegin = run;
// Move beyond the end of the segment.
while (run != end() && (*run).start() < segment->end)
++run;
// Special case when segment == run.
if (run == rangeBegin)
++run;
return Range<Iterator>(rangeBegin, run);
}
LineResolver::Iterator::Iterator(RunResolver::Iterator runIterator)
: m_runIterator(runIterator)
{
}
const FloatRect LineResolver::Iterator::operator*() const
{
unsigned currentLine = m_runIterator.lineIndex();
auto it = m_runIterator;
FloatRect rect = (*it).rect();
while (it.advance().lineIndex() == currentLine)
rect.unite((*it).rect());
return rect;
}
LineResolver::LineResolver(const RenderBlockFlow& flow, const Layout& layout)
: m_runResolver(flow, layout)
{
}
}
}
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