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      1 /*
      2  * Copyright (C) 2003, 2006, 2009 Apple Inc. All rights reserved.
      3  * Copyright (C) 2010 Google Inc. All rights reserved.
      4  * Copyright (C) 2013 Xidorn Quan (quanxunzhen (at) gmail.com)
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  *
     10  * 1.  Redistributions of source code must retain the above copyright
     11  *     notice, this list of conditions and the following disclaimer.
     12  * 2.  Redistributions in binary form must reproduce the above copyright
     13  *     notice, this list of conditions and the following disclaimer in the
     14  *     documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
     17  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     18  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     19  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     20  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     21  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     22  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     23  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #include "config.h"
     29 #include "platform/geometry/RoundedRect.h"
     30 
     31 #include "wtf/Assertions.h"
     32 #include <algorithm>
     33 
     34 namespace blink {
     35 
     36 bool RoundedRect::Radii::isZero() const
     37 {
     38     return m_topLeft.isZero() && m_topRight.isZero() && m_bottomLeft.isZero() && m_bottomRight.isZero();
     39 }
     40 
     41 void RoundedRect::Radii::scale(float factor)
     42 {
     43     if (factor == 1)
     44         return;
     45 
     46     // If either radius on a corner becomes zero, reset both radii on that corner.
     47     m_topLeft.scale(factor);
     48     if (!m_topLeft.width() || !m_topLeft.height())
     49         m_topLeft = IntSize();
     50     m_topRight.scale(factor);
     51     if (!m_topRight.width() || !m_topRight.height())
     52         m_topRight = IntSize();
     53     m_bottomLeft.scale(factor);
     54     if (!m_bottomLeft.width() || !m_bottomLeft.height())
     55         m_bottomLeft = IntSize();
     56     m_bottomRight.scale(factor);
     57     if (!m_bottomRight.width() || !m_bottomRight.height())
     58         m_bottomRight = IntSize();
     59 
     60 }
     61 
     62 void RoundedRect::Radii::expand(int topWidth, int bottomWidth, int leftWidth, int rightWidth)
     63 {
     64     if (m_topLeft.width() > 0 && m_topLeft.height() > 0) {
     65         m_topLeft.setWidth(std::max<int>(0, m_topLeft.width() + leftWidth));
     66         m_topLeft.setHeight(std::max<int>(0, m_topLeft.height() + topWidth));
     67     }
     68     if (m_topRight.width() > 0 && m_topRight.height() > 0) {
     69         m_topRight.setWidth(std::max<int>(0, m_topRight.width() + rightWidth));
     70         m_topRight.setHeight(std::max<int>(0, m_topRight.height() + topWidth));
     71     }
     72     if (m_bottomLeft.width() > 0 && m_bottomLeft.height() > 0) {
     73         m_bottomLeft.setWidth(std::max<int>(0, m_bottomLeft.width() + leftWidth));
     74         m_bottomLeft.setHeight(std::max<int>(0, m_bottomLeft.height() + bottomWidth));
     75     }
     76     if (m_bottomRight.width() > 0 && m_bottomRight.height() > 0) {
     77         m_bottomRight.setWidth(std::max<int>(0, m_bottomRight.width() + rightWidth));
     78         m_bottomRight.setHeight(std::max<int>(0, m_bottomRight.height() + bottomWidth));
     79     }
     80 }
     81 
     82 void RoundedRect::inflateWithRadii(int size)
     83 {
     84     IntRect old = m_rect;
     85 
     86     m_rect.inflate(size);
     87     // Considering the inflation factor of shorter size to scale the radii seems appropriate here
     88     float factor;
     89     if (m_rect.width() < m_rect.height())
     90         factor = old.width() ? (float)m_rect.width() / old.width() : int(0);
     91     else
     92         factor = old.height() ? (float)m_rect.height() / old.height() : int(0);
     93 
     94     m_radii.scale(factor);
     95 }
     96 
     97 void RoundedRect::Radii::includeLogicalEdges(const RoundedRect::Radii& edges, bool isHorizontal, bool includeLogicalLeftEdge, bool includeLogicalRightEdge)
     98 {
     99     if (includeLogicalLeftEdge) {
    100         if (isHorizontal)
    101             m_bottomLeft = edges.bottomLeft();
    102         else
    103             m_topRight = edges.topRight();
    104         m_topLeft = edges.topLeft();
    105     }
    106 
    107     if (includeLogicalRightEdge) {
    108         if (isHorizontal)
    109             m_topRight = edges.topRight();
    110         else
    111             m_bottomLeft = edges.bottomLeft();
    112         m_bottomRight = edges.bottomRight();
    113     }
    114 }
    115 
    116 void RoundedRect::Radii::excludeLogicalEdges(bool isHorizontal, bool excludeLogicalLeftEdge, bool excludeLogicalRightEdge)
    117 {
    118     if (excludeLogicalLeftEdge) {
    119         if (isHorizontal)
    120             m_bottomLeft = IntSize();
    121         else
    122             m_topRight = IntSize();
    123         m_topLeft = IntSize();
    124     }
    125 
    126     if (excludeLogicalRightEdge) {
    127         if (isHorizontal)
    128             m_topRight = IntSize();
    129         else
    130             m_bottomLeft = IntSize();
    131         m_bottomRight = IntSize();
    132     }
    133 }
    134 
    135 RoundedRect::RoundedRect(int x, int y, int width, int height)
    136     : m_rect(x, y, width, height)
    137 {
    138 }
    139 
    140 RoundedRect::RoundedRect(const IntRect& rect, const Radii& radii)
    141     : m_rect(rect)
    142     , m_radii(radii)
    143 {
    144 }
    145 
    146 RoundedRect::RoundedRect(const IntRect& rect, const IntSize& topLeft, const IntSize& topRight, const IntSize& bottomLeft, const IntSize& bottomRight)
    147     : m_rect(rect)
    148     , m_radii(topLeft, topRight, bottomLeft, bottomRight)
    149 {
    150 }
    151 
    152 IntRect RoundedRect::radiusCenterRect() const
    153 {
    154     ASSERT(isRenderable());
    155     int minX = m_rect.x() + std::max(m_radii.topLeft().width(), m_radii.bottomLeft().width());
    156     int minY = m_rect.y() + std::max(m_radii.topLeft().height(), m_radii.topRight().height());
    157     int maxX = m_rect.maxX() - std::max(m_radii.topRight().width(), m_radii.bottomRight().width());
    158     int maxY = m_rect.maxY() - std::max(m_radii.bottomLeft().height(), m_radii.bottomRight().height());
    159     return IntRect(minX, minY, maxX - minX, maxY - minY);
    160 }
    161 
    162 void RoundedRect::includeLogicalEdges(const Radii& edges, bool isHorizontal, bool includeLogicalLeftEdge, bool includeLogicalRightEdge)
    163 {
    164     m_radii.includeLogicalEdges(edges, isHorizontal, includeLogicalLeftEdge, includeLogicalRightEdge);
    165 }
    166 
    167 void RoundedRect::excludeLogicalEdges(bool isHorizontal, bool excludeLogicalLeftEdge, bool excludeLogicalRightEdge)
    168 {
    169     m_radii.excludeLogicalEdges(isHorizontal, excludeLogicalLeftEdge, excludeLogicalRightEdge);
    170 }
    171 
    172 bool RoundedRect::isRenderable() const
    173 {
    174     return m_radii.topLeft().width() + m_radii.topRight().width() <= m_rect.width()
    175         && m_radii.bottomLeft().width() + m_radii.bottomRight().width() <= m_rect.width()
    176         && m_radii.topLeft().height() + m_radii.bottomLeft().height() <= m_rect.height()
    177         && m_radii.topRight().height() + m_radii.bottomRight().height() <= m_rect.height();
    178 }
    179 
    180 void RoundedRect::adjustRadii()
    181 {
    182     int maxRadiusWidth = std::max(m_radii.topLeft().width() + m_radii.topRight().width(), m_radii.bottomLeft().width() + m_radii.bottomRight().width());
    183     int maxRadiusHeight = std::max(m_radii.topLeft().height() + m_radii.bottomLeft().height(), m_radii.topRight().height() + m_radii.bottomRight().height());
    184 
    185     if (maxRadiusWidth <= 0 || maxRadiusHeight <= 0) {
    186         m_radii.scale(0.0f);
    187         return;
    188     }
    189     float widthRatio = static_cast<float>(m_rect.width()) / maxRadiusWidth;
    190     float heightRatio = static_cast<float>(m_rect.height()) / maxRadiusHeight;
    191     m_radii.scale(widthRatio < heightRatio ? widthRatio : heightRatio);
    192 }
    193 
    194 bool RoundedRect::intersectsQuad(const FloatQuad& quad) const
    195 {
    196     FloatRect rect(m_rect);
    197     if (!quad.intersectsRect(rect))
    198         return false;
    199 
    200     const IntSize& topLeft = m_radii.topLeft();
    201     if (!topLeft.isEmpty()) {
    202         FloatRect rect(m_rect.x(), m_rect.y(), topLeft.width(), topLeft.height());
    203         if (quad.intersectsRect(rect)) {
    204             FloatPoint center(m_rect.x() + topLeft.width(), m_rect.y() + topLeft.height());
    205             FloatSize size(topLeft.width(), topLeft.height());
    206             if (!quad.intersectsEllipse(center, size))
    207                 return false;
    208         }
    209     }
    210 
    211     const IntSize& topRight = m_radii.topRight();
    212     if (!topRight.isEmpty()) {
    213         FloatRect rect(m_rect.maxX() - topRight.width(), m_rect.y(), topRight.width(), topRight.height());
    214         if (quad.intersectsRect(rect)) {
    215             FloatPoint center(m_rect.maxX() - topRight.width(), m_rect.y() + topRight.height());
    216             FloatSize size(topRight.width(), topRight.height());
    217             if (!quad.intersectsEllipse(center, size))
    218                 return false;
    219         }
    220     }
    221 
    222     const IntSize& bottomLeft = m_radii.bottomLeft();
    223     if (!bottomLeft.isEmpty()) {
    224         FloatRect rect(m_rect.x(), m_rect.maxY() - bottomLeft.height(), bottomLeft.width(), bottomLeft.height());
    225         if (quad.intersectsRect(rect)) {
    226             FloatPoint center(m_rect.x() + bottomLeft.width(), m_rect.maxY() - bottomLeft.height());
    227             FloatSize size(bottomLeft.width(), bottomLeft.height());
    228             if (!quad.intersectsEllipse(center, size))
    229                 return false;
    230         }
    231     }
    232 
    233     const IntSize& bottomRight = m_radii.bottomRight();
    234     if (!bottomRight.isEmpty()) {
    235         FloatRect rect(m_rect.maxX() - bottomRight.width(), m_rect.maxY() - bottomRight.height(), bottomRight.width(), bottomRight.height());
    236         if (quad.intersectsRect(rect)) {
    237             FloatPoint center(m_rect.maxX() - bottomRight.width(), m_rect.maxY() - bottomRight.height());
    238             FloatSize size(bottomRight.width(), bottomRight.height());
    239             if (!quad.intersectsEllipse(center, size))
    240                 return false;
    241         }
    242     }
    243 
    244     return true;
    245 }
    246 
    247 } // namespace blink
    248