SimpleLineLayoutFlowContents.h [plain text]
#pragma once
#include "RenderObject.h"
namespace WebCore {
class RenderBlockFlow;
namespace SimpleLineLayout {
class FlowContents {
public:
FlowContents(const RenderBlockFlow&);
struct Segment {
unsigned toSegmentPosition(unsigned position) const
{
ASSERT(position >= start);
return position - start;
}
unsigned toRenderPosition(unsigned position) const { return start + position; }
unsigned start;
unsigned end;
StringView text;
const RenderObject& renderer;
bool canUseSimplifiedTextMeasuring;
};
const Segment& segmentForRun(unsigned start, unsigned end) const;
const Segment& segmentForPosition(unsigned) const;
typedef Vector<Segment, 8>::const_iterator Iterator;
Iterator begin() const { return m_segments.begin(); }
Iterator end() const { return m_segments.end(); }
private:
unsigned segmentIndexForRunSlow(unsigned start, unsigned end) const;
const Vector<Segment> m_segments;
mutable unsigned m_lastSegmentIndex { 0 };
};
inline const FlowContents::Segment& FlowContents::segmentForRun(unsigned start, unsigned end) const
{
ASSERT(start <= end);
auto isEmptyRange = start == end;
auto& lastSegment = m_segments[m_lastSegmentIndex];
if ((lastSegment.start <= start && end <= lastSegment.end) && (!isEmptyRange || end != lastSegment.end))
return m_segments[m_lastSegmentIndex];
return m_segments[segmentIndexForRunSlow(start, end)];
}
inline const FlowContents::Segment& FlowContents::segmentForPosition(unsigned position) const
{
auto it = std::lower_bound(m_segments.begin(), m_segments.end(), position, [](const Segment& segment, unsigned position) {
return segment.end <= position;
});
ASSERT(it != m_segments.end());
return m_segments[it - m_segments.begin()];
}
}
}