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      1 /*
      2  * Copyright (C) 2013 Adobe Systems Incorporated. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  *
      8  * 1. Redistributions of source code must retain the above
      9  *    copyright notice, this list of conditions and the following
     10  *    disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above
     12  *    copyright notice, this list of conditions and the following
     13  *    disclaimer in the documentation and/or other materials
     14  *    provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
     19  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
     20  * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
     21  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     23  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
     25  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     26  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
     27  * OF THE POSSIBILITY OF SUCH DAMAGE.
     28  */
     29 
     30 #include "config.h"
     31 #include "core/rendering/shapes/BoxShape.h"
     32 
     33 #include "wtf/MathExtras.h"
     34 
     35 namespace blink {
     36 
     37 LayoutRect BoxShape::shapeMarginLogicalBoundingBox() const
     38 {
     39     FloatRect marginBounds(m_bounds.rect());
     40     if (shapeMargin() > 0)
     41         marginBounds.inflate(shapeMargin());
     42     return static_cast<LayoutRect>(marginBounds);
     43 }
     44 
     45 FloatRoundedRect BoxShape::shapeMarginBounds() const
     46 {
     47     FloatRoundedRect marginBounds(m_bounds);
     48     if (shapeMargin() > 0) {
     49         marginBounds.inflate(shapeMargin());
     50         marginBounds.expandRadii(shapeMargin());
     51     }
     52     return marginBounds;
     53 }
     54 
     55 LineSegment BoxShape::getExcludedInterval(LayoutUnit logicalTop, LayoutUnit logicalHeight) const
     56 {
     57     const FloatRoundedRect& marginBounds = shapeMarginBounds();
     58     if (marginBounds.isEmpty() || !lineOverlapsShapeMarginBounds(logicalTop, logicalHeight))
     59         return LineSegment();
     60 
     61     float y1 = logicalTop.toFloat();
     62     float y2 = (logicalTop + logicalHeight).toFloat();
     63     const FloatRect& rect = marginBounds.rect();
     64 
     65     if (!marginBounds.isRounded())
     66         return LineSegment(marginBounds.rect().x(), marginBounds.rect().maxX());
     67 
     68     float topCornerMaxY = std::max<float>(marginBounds.topLeftCorner().maxY(), marginBounds.topRightCorner().maxY());
     69     float bottomCornerMinY = std::min<float>(marginBounds.bottomLeftCorner().y(), marginBounds.bottomRightCorner().y());
     70 
     71     if (topCornerMaxY <= bottomCornerMinY && y1 <= topCornerMaxY && y2 >= bottomCornerMinY)
     72         return LineSegment(rect.x(), rect.maxX());
     73 
     74     float x1 = rect.maxX();
     75     float x2 = rect.x();
     76     float minXIntercept;
     77     float maxXIntercept;
     78 
     79     if (y1 <= marginBounds.topLeftCorner().maxY() && y2 >= marginBounds.bottomLeftCorner().y())
     80         x1 = rect.x();
     81 
     82     if (y1 <= marginBounds.topRightCorner().maxY() && y2 >= marginBounds.bottomRightCorner().y())
     83         x2 = rect.maxX();
     84 
     85     if (marginBounds.xInterceptsAtY(y1, minXIntercept, maxXIntercept)) {
     86         x1 = std::min<float>(x1, minXIntercept);
     87         x2 = std::max<float>(x2, maxXIntercept);
     88     }
     89 
     90     if (marginBounds.xInterceptsAtY(y2, minXIntercept, maxXIntercept)) {
     91         x1 = std::min<float>(x1, minXIntercept);
     92         x2 = std::max<float>(x2, maxXIntercept);
     93     }
     94 
     95     ASSERT(x2 >= x1);
     96     return LineSegment(x1, x2);
     97 }
     98 
     99 void BoxShape::buildDisplayPaths(DisplayPaths& paths) const
    100 {
    101     paths.shape.addRoundedRect(m_bounds.rect(), m_bounds.radii().topLeft(), m_bounds.radii().topRight(), m_bounds.radii().bottomLeft(), m_bounds.radii().bottomRight());
    102     if (shapeMargin())
    103         paths.marginShape.addRoundedRect(shapeMarginBounds().rect(), shapeMarginBounds().radii().topLeft(), shapeMarginBounds().radii().topRight(), shapeMarginBounds().radii().bottomLeft(), shapeMarginBounds().radii().bottomRight());
    104 }
    105 
    106 } // namespace blink
    107