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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 "core/layout/shapes/RectangleShape.h"
#include "wtf/MathExtras.h"
namespace blink {
static inline float ellipseXIntercept(float y, float rx, float ry) {
ASSERT(ry > 0);
return rx * sqrt(1 - (y * y) / (ry * ry));
}
FloatRect RectangleShape::shapeMarginBounds() const {
ASSERT(shapeMargin() >= 0);
if (!shapeMargin())
return m_bounds;
float boundsX = x() - shapeMargin();
float boundsY = y() - shapeMargin();
float boundsWidth = width() + shapeMargin() * 2;
float boundsHeight = height() + shapeMargin() * 2;
return FloatRect(boundsX, boundsY, boundsWidth, boundsHeight);
}
LineSegment RectangleShape::getExcludedInterval(
LayoutUnit logicalTop,
LayoutUnit logicalHeight) const {
const FloatRect& bounds = shapeMarginBounds();
if (bounds.isEmpty())
return LineSegment();
float y1 = logicalTop.toFloat();
float y2 = (logicalTop + logicalHeight).toFloat();
if (y2 < bounds.y() || y1 >= bounds.maxY())
return LineSegment();
float x1 = bounds.x();
float x2 = bounds.maxX();
float marginRadiusX = rx() + shapeMargin();
float marginRadiusY = ry() + shapeMargin();
if (marginRadiusY > 0) {
if (y2 < bounds.y() + marginRadiusY) {
float yi = y2 - bounds.y() - marginRadiusY;
float xi = ellipseXIntercept(yi, marginRadiusX, marginRadiusY);
x1 = bounds.x() + marginRadiusX - xi;
x2 = bounds.maxX() - marginRadiusX + xi;
} else if (y1 > bounds.maxY() - marginRadiusY) {
float yi = y1 - (bounds.maxY() - marginRadiusY);
float xi = ellipseXIntercept(yi, marginRadiusX, marginRadiusY);
x1 = bounds.x() + marginRadiusX - xi;
x2 = bounds.maxX() - marginRadiusX + xi;
}
}
return LineSegment(x1, x2);
}
void RectangleShape::buildDisplayPaths(DisplayPaths& paths) const {
paths.shape.addRoundedRect(m_bounds, m_radii);
if (shapeMargin())
paths.marginShape.addRoundedRect(
shapeMarginBounds(), FloatSize(m_radii.width() + shapeMargin(),
m_radii.height() + shapeMargin()));
}
} // namespace blink
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