void MarginIntervalGenerator::set(int y, const IntShapeInterval& interval)
{
ASSERT(y >= 0 && interval.x1() >= 0);
m_y = y;
m_x1 = interval.x1();
m_x2 = interval.x2();
}
void RasterShapeIntervals::uniteMarginInterval(int y, const IntShapeInterval& interval)
{
ASSERT(m_intervalLists[y].size() <= 1); // Each m_intervalLists entry has 0 or one interval.
if (m_intervalLists[y].isEmpty())
m_intervalLists[y].append(interval);
else {
IntShapeInterval& resultInterval = m_intervalLists[y][0];
resultInterval.set(std::min(resultInterval.x1(), interval.x1()), std::max(resultInterval.x2(), interval.x2()));
}
m_bounds.unite(IntRect(interval.x1(), y, interval.width(), 1));
}
void RasterShapeIntervals::buildBoundsPath(Path& path) const
{
int maxY = bounds().maxY();
for (int y = bounds().y(); y < maxY; y++) {
if (intervalAt(y).isEmpty())
continue;
IntShapeInterval extent = intervalAt(y);
int endY = y + 1;
for (; endY < maxY; endY++) {
if (intervalAt(endY).isEmpty() || intervalAt(endY) != extent)
break;
}
path.addRect(FloatRect(extent.x1(), y, extent.width(), endY - y));
y = endY - 1;
}
}
void RasterShape::getExcludedIntervals(LayoutUnit logicalTop, LayoutUnit logicalHeight, SegmentList& result) const
{
const RasterShapeIntervals& intervals = marginIntervals();
if (intervals.isEmpty())
return;
int y1 = logicalTop;
int y2 = logicalTop + logicalHeight;
ASSERT(y2 >= y1);
if (y2 < intervals.bounds().y() || y1 >= intervals.bounds().maxY())
return;
y1 = std::max(y1, intervals.bounds().y());
y2 = std::min(y2, intervals.bounds().maxY());
IntShapeInterval excludedInterval;
for (int y = y1; y < y2; y++)
excludedInterval.unite(intervals.intervalAt(y));
// Note: |marginIntervals()| returns end-point exclusive
// intervals. |excludedInterval.x2()| contains the left-most pixel
// offset to the right of the calculated union.
result.append(LineSegment(excludedInterval.x1(), excludedInterval.x2()));
}