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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/shapes/RasterShape.h"
#include "core/rendering/shapes/ShapeInterval.h"
#include "wtf/MathExtras.h"
namespace WebCore {
IntRect RasterShapeIntervals::bounds() const
{
if (!m_bounds)
m_bounds = adoptPtr(new IntRect(m_region.bounds()));
return *m_bounds;
}
void RasterShapeIntervals::addInterval(int y, int x1, int x2)
{
m_region.unite(Region(IntRect(x1, y, x2 - x1, 1)));
m_bounds.clear();
}
static inline IntRect alignedRect(IntRect r, int y1, int y2)
{
return IntRect(r.x(), y1, r.width(), y2 - y1);
}
void RasterShapeIntervals::getIncludedIntervals(int y1, int y2, SegmentList& result) const
{
ASSERT(y2 >= y1);
IntRect lineRect(bounds().x(), y1, bounds().width(), y2 - y1);
Region lineRegion(lineRect);
lineRegion.intersect(m_region);
if (lineRegion.isEmpty())
return;
Vector<IntRect> lineRects = lineRegion.rects();
ASSERT(lineRects.size() > 0);
Region segmentsRegion(lineRect);
Region intervalsRegion;
// The loop below uses Regions to compute the intersection of the horizontal
// shape intervals that fall within the line's box.
int lineY = lineRects[0].y();
for (unsigned i = 0; i < lineRects.size(); ++i) {
if (lineRects[i].y() != lineY) {
segmentsRegion.intersect(intervalsRegion);
intervalsRegion = Region();
}
intervalsRegion.unite(Region(alignedRect(lineRects[i], y1, y2)));
lineY = lineRects[i].y();
}
if (!intervalsRegion.isEmpty())
segmentsRegion.intersect(intervalsRegion);
Vector<IntRect> segmentRects = segmentsRegion.rects();
for (unsigned i = 0; i < segmentRects.size(); ++i)
result.append(LineSegment(segmentRects[i].x(), segmentRects[i].maxX()));
}
const RasterShapeIntervals& RasterShape::marginIntervals() const
{
ASSERT(shapeMargin() >= 0);
if (!shapeMargin())
return *m_intervals;
// FIXME: add support for non-zero margin, see https://code.google.com/p/chromium/issues/detail?id=252737.
return *m_intervals;
}
const RasterShapeIntervals& RasterShape::paddingIntervals() const
{
ASSERT(shapePadding() >= 0);
if (!shapePadding())
return *m_intervals;
// FIXME: add support for non-zero padding, see https://code.google.com/p/chromium/issues/detail?id=252737.
return *m_intervals;
}
void RasterShape::getExcludedIntervals(LayoutUnit, LayoutUnit, SegmentList&) const
{
// FIXME: this method is only a stub, see https://code.google.com/p/chromium/issues/detail?id=252737.
}
void RasterShape::getIncludedIntervals(LayoutUnit logicalTop, LayoutUnit logicalHeight, SegmentList& result) const
{
const RasterShapeIntervals& intervals = paddingIntervals();
if (intervals.isEmpty())
return;
float y1 = logicalTop;
float y2 = logicalTop + logicalHeight;
if (y1 < intervals.bounds().y() || y2 > intervals.bounds().maxY())
return;
intervals.getIncludedIntervals(y1, y2, result);
}
bool RasterShape::firstIncludedIntervalLogicalTop(LayoutUnit minLogicalIntervalTop, const LayoutSize& minLogicalIntervalSize, LayoutUnit& result) const
{
float minIntervalTop = minLogicalIntervalTop;
float minIntervalHeight = minLogicalIntervalSize.height();
float minIntervalWidth = minLogicalIntervalSize.width();
const RasterShapeIntervals& intervals = paddingIntervals();
if (intervals.isEmpty() || minIntervalWidth > intervals.bounds().width())
return false;
float minY = std::max<float>(intervals.bounds().y(), minIntervalTop);
float maxY = minY + minIntervalHeight;
if (maxY > intervals.bounds().maxY())
return false;
// FIXME: complete this method, see https://code.google.com/p/chromium/issues/detail?id=252737.
result = minY;
return true;
}
} // namespace WebCore
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