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99 lines
3.5 KiB
C++
99 lines
3.5 KiB
C++
/*
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* Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "core/rendering/shapes/RectangleShape.h"
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#include "wtf/MathExtras.h"
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namespace blink {
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static inline float ellipseXIntercept(float y, float rx, float ry)
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{
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ASSERT(ry > 0);
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return rx * sqrt(1 - (y * y) / (ry * ry));
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}
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FloatRect RectangleShape::shapeMarginBounds() const
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{
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ASSERT(shapeMargin() >= 0);
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if (!shapeMargin())
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return m_bounds;
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float boundsX = x() - shapeMargin();
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float boundsY = y() - shapeMargin();
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float boundsWidth = width() + shapeMargin() * 2;
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float boundsHeight = height() + shapeMargin() * 2;
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return FloatRect(boundsX, boundsY, boundsWidth, boundsHeight);
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}
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LineSegment RectangleShape::getExcludedInterval(LayoutUnit logicalTop, LayoutUnit logicalHeight) const
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{
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const FloatRect& bounds = shapeMarginBounds();
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if (bounds.isEmpty())
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return LineSegment();
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float y1 = logicalTop.toFloat();
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float y2 = (logicalTop + logicalHeight).toFloat();
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if (y2 < bounds.y() || y1 >= bounds.maxY())
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return LineSegment();
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float x1 = bounds.x();
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float x2 = bounds.maxX();
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float marginRadiusX = rx() + shapeMargin();
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float marginRadiusY = ry() + shapeMargin();
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if (marginRadiusY > 0) {
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if (y2 < bounds.y() + marginRadiusY) {
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float yi = y2 - bounds.y() - marginRadiusY;
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float xi = ellipseXIntercept(yi, marginRadiusX, marginRadiusY);
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x1 = bounds.x() + marginRadiusX - xi;
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x2 = bounds.maxX() - marginRadiusX + xi;
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} else if (y1 > bounds.maxY() - marginRadiusY) {
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float yi = y1 - (bounds.maxY() - marginRadiusY);
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float xi = ellipseXIntercept(yi, marginRadiusX, marginRadiusY);
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x1 = bounds.x() + marginRadiusX - xi;
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x2 = bounds.maxX() - marginRadiusX + xi;
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}
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}
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return LineSegment(x1, x2);
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}
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void RectangleShape::buildDisplayPaths(DisplayPaths& paths) const
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{
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paths.shape.addRoundedRect(m_bounds, m_radii);
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if (shapeMargin())
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paths.marginShape.addRoundedRect(shapeMarginBounds(), FloatSize(m_radii.width() + shapeMargin(), m_radii.height() + shapeMargin()));
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}
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} // namespace blink
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