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/*
* Copyright (C) 2012 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 "ExclusionRectangle.h"
#include <wtf/MathExtras.h>
namespace WebCore {
static inline float ellipseXIntercept(float y, float rx, float ry)
{
ASSERT(ry > 0);
return rx * sqrt(1 - (y*y) / (ry*ry));
}
void ExclusionRectangle::getExcludedIntervals(float logicalTop, float logicalHeight, SegmentList& result) const
{
if (isEmpty())
return;
float y1 = minYForLogicalLine(logicalTop, logicalHeight);
float y2 = maxYForLogicalLine(logicalTop, logicalHeight);
if (y2 < m_y || y1 >= m_y + m_height)
return;
float x1 = m_x;
float x2 = m_x + m_width;
if (m_ry > 0) {
if (y2 < m_y + m_ry) {
float yi = y2 - m_y - m_ry;
float xi = ellipseXIntercept(yi, m_rx, m_ry);
x1 = m_x + m_rx - xi;
x2 = m_x + m_width - m_rx + xi;
} else if (y1 > m_y + m_height - m_ry) {
float yi = y1 - (m_y + m_height - m_ry);
float xi = ellipseXIntercept(yi, m_rx, m_ry);
x1 = m_x + m_rx - xi;
x2 = m_x + m_width - m_rx + xi;
}
}
result.append(LineSegment(x1, x2));
}
void ExclusionRectangle::getIncludedIntervals(float logicalTop, float logicalHeight, SegmentList& result) const
{
if (isEmpty())
return;
float y1 = minYForLogicalLine(logicalTop, logicalHeight);
float y2 = maxYForLogicalLine(logicalTop, logicalHeight);
if (y1 < m_y || y2 > m_y + m_height)
return;
float x1 = m_x;
float x2 = m_x + m_width;
if (m_ry > 0) {
bool y1InterceptsCorner = y1 < m_y + m_ry;
bool y2InterceptsCorner = y2 > m_y + m_height - m_ry;
float xi = 0;
if (y1InterceptsCorner && y2InterceptsCorner) {
if (y1 < m_height + 2*m_y - y2) {
float yi = y1 - m_y - m_ry;
xi = ellipseXIntercept(yi, m_rx, m_ry);
} else {
float yi = y2 - (m_y + m_height - m_ry);
xi = ellipseXIntercept(yi, m_rx, m_ry);
}
} else if (y1InterceptsCorner) {
float yi = y1 - m_y - m_ry;
xi = ellipseXIntercept(yi, m_rx, m_ry);
} else if (y2InterceptsCorner) {
float yi = y2 - (m_y + m_height - m_ry);
xi = ellipseXIntercept(yi, m_rx, m_ry);
}
if (y1InterceptsCorner || y2InterceptsCorner) {
x1 = m_x + m_rx - xi;
x2 = m_x + m_width - m_rx + xi;
}
}
result.append(LineSegment(x1, x2));
}
} // namespace WebCore
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