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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 "BoxShape.h"
#include "RenderBox.h"
#include <wtf/MathExtras.h>
namespace WebCore {
static inline LayoutUnit adjustRadiusForMarginBoxShape(LayoutUnit radius, LayoutUnit margin)
{
// This algorithm is defined in the CSS Shapes specifcation
if (!margin)
return radius;
LayoutUnit ratio = radius / margin;
if (ratio < 1)
return radius + (margin * (1 + pow(ratio - 1, 3.0)));
return radius + margin;
}
static inline LayoutSize computeMarginBoxShapeRadius(const LayoutSize& radius, const LayoutSize& adjacentMargins)
{
return LayoutSize(adjustRadiusForMarginBoxShape(radius.width(), adjacentMargins.width()),
adjustRadiusForMarginBoxShape(radius.height(), adjacentMargins.height()));
}
static inline RoundedRect::Radii computeMarginBoxShapeRadii(const RoundedRect::Radii& radii, const RenderBox& renderer)
{
return RoundedRect::Radii(computeMarginBoxShapeRadius(radii.topLeft(), LayoutSize(renderer.marginLeft(), renderer.marginTop())),
computeMarginBoxShapeRadius(radii.topRight(), LayoutSize(renderer.marginRight(), renderer.marginTop())),
computeMarginBoxShapeRadius(radii.bottomLeft(), LayoutSize(renderer.marginLeft(), renderer.marginBottom())),
computeMarginBoxShapeRadius(radii.bottomRight(), LayoutSize(renderer.marginRight(), renderer.marginBottom())));
}
RoundedRect computeRoundedRectForBoxShape(CSSBoxType box, const RenderBox& renderer)
{
const RenderStyle& style = renderer.style();
switch (box) {
case MarginBox: {
if (!style.hasBorderRadius())
return RoundedRect(renderer.marginBoxRect(), RoundedRect::Radii());
LayoutRect marginBox = renderer.marginBoxRect();
RoundedRect::Radii radii = computeMarginBoxShapeRadii(style.getRoundedBorderFor(renderer.borderBoxRect()).radii(), renderer);
radii.scale(calcBorderRadiiConstraintScaleFor(marginBox, radii));
return RoundedRect(marginBox, radii);
}
case PaddingBox:
return style.getRoundedInnerBorderFor(renderer.borderBoxRect());
case ContentBox:
return style.getRoundedInnerBorderFor(renderer.borderBoxRect(),
renderer.paddingTop() + renderer.borderTop(), renderer.paddingBottom() + renderer.borderBottom(),
renderer.paddingLeft() + renderer.borderLeft(), renderer.paddingRight() + renderer.borderRight());
// fill, stroke, view-box compute to border-box for HTML elements.
case BorderBox:
case Fill:
case Stroke:
case ViewBox:
case BoxMissing:
return style.getRoundedBorderFor(renderer.borderBoxRect());
}
ASSERT_NOT_REACHED();
return style.getRoundedBorderFor(renderer.borderBoxRect());
}
LayoutRect BoxShape::shapeMarginLogicalBoundingBox() const
{
FloatRect marginBounds(m_bounds.rect());
if (shapeMargin() > 0)
marginBounds.inflate(shapeMargin());
return static_cast<LayoutRect>(marginBounds);
}
FloatRoundedRect BoxShape::shapeMarginBounds() const
{
FloatRoundedRect marginBounds(m_bounds);
if (shapeMargin() > 0) {
marginBounds.inflate(shapeMargin());
marginBounds.expandRadii(shapeMargin());
}
return marginBounds;
}
LineSegment BoxShape::getExcludedInterval(LayoutUnit logicalTop, LayoutUnit logicalHeight) const
{
const FloatRoundedRect& marginBounds = shapeMarginBounds();
if (marginBounds.isEmpty() || !lineOverlapsShapeMarginBounds(logicalTop, logicalHeight))
return LineSegment();
float y1 = logicalTop;
float y2 = logicalTop + logicalHeight;
const FloatRect& rect = marginBounds.rect();
if (!marginBounds.isRounded())
return LineSegment(rect.x(), rect.maxX());
float topCornerMaxY = std::max<float>(marginBounds.topLeftCorner().maxY(), marginBounds.topRightCorner().maxY());
float bottomCornerMinY = std::min<float>(marginBounds.bottomLeftCorner().y(), marginBounds.bottomRightCorner().y());
if (topCornerMaxY <= bottomCornerMinY && y1 <= topCornerMaxY && y2 >= bottomCornerMinY)
return LineSegment(rect.x(), rect.maxX());
float x1 = rect.maxX();
float x2 = rect.x();
float minXIntercept;
float maxXIntercept;
if (y1 <= marginBounds.topLeftCorner().maxY() && y2 >= marginBounds.bottomLeftCorner().y())
x1 = rect.x();
if (y1 <= marginBounds.topRightCorner().maxY() && y2 >= marginBounds.bottomRightCorner().y())
x2 = rect.maxX();
if (marginBounds.xInterceptsAtY(y1, minXIntercept, maxXIntercept)) {
x1 = std::min<float>(x1, minXIntercept);
x2 = std::max<float>(x2, maxXIntercept);
}
if (marginBounds.xInterceptsAtY(y2, minXIntercept, maxXIntercept)) {
x1 = std::min<float>(x1, minXIntercept);
x2 = std::max<float>(x2, maxXIntercept);
}
ASSERT(x2 >= x1);
return LineSegment(x1, x2);
}
void BoxShape::buildDisplayPaths(DisplayPaths& paths) const
{
paths.shape.addRoundedRect(m_bounds, Path::PreferBezierRoundedRect);
if (shapeMargin())
paths.marginShape.addRoundedRect(shapeMarginBounds(), Path::PreferBezierRoundedRect);
}
} // namespace WebCore
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