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      1 /*
      2  * Copyright (C) 2011 University of Szeged
      3  * Copyright (C) 2011 Renata Hodovan <reni (at) webkit.org>
      4  * All rights reserved.
      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  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY UNIVERSITY OF SZEGED ``AS IS'' AND ANY
     16  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     18  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL UNIVERSITY OF SZEGED OR
     19  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     20  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     22  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     23  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     25  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #include "config.h"
     29 
     30 #include "core/rendering/svg/RenderSVGRect.h"
     31 
     32 #include "SVGNames.h"
     33 
     34 namespace WebCore {
     35 
     36 RenderSVGRect::RenderSVGRect(SVGRectElement* node)
     37     : RenderSVGShape(node)
     38     , m_usePathFallback(false)
     39 {
     40 }
     41 
     42 RenderSVGRect::~RenderSVGRect()
     43 {
     44 }
     45 
     46 void RenderSVGRect::updateShapeFromElement()
     47 {
     48     // Before creating a new object we need to clear the cached bounding box
     49     // to avoid using garbage.
     50     m_fillBoundingBox = FloatRect();
     51     m_innerStrokeRect = FloatRect();
     52     m_outerStrokeRect = FloatRect();
     53     SVGRectElement* rect = toSVGRectElement(node());
     54     ASSERT(rect);
     55 
     56     SVGLengthContext lengthContext(rect);
     57     // Fallback to RenderSVGShape if rect has rounded corners or a non-scaling stroke.
     58     if (rect->rxCurrentValue().value(lengthContext) > 0 || rect->ryCurrentValue().value(lengthContext) > 0 || hasNonScalingStroke()) {
     59         RenderSVGShape::updateShapeFromElement();
     60         m_usePathFallback = true;
     61         return;
     62     }
     63 
     64     m_usePathFallback = false;
     65     FloatSize boundingBoxSize(rect->widthCurrentValue().value(lengthContext), rect->heightCurrentValue().value(lengthContext));
     66     if (boundingBoxSize.isEmpty())
     67         return;
     68 
     69     m_fillBoundingBox = FloatRect(FloatPoint(rect->xCurrentValue().value(lengthContext), rect->yCurrentValue().value(lengthContext)), boundingBoxSize);
     70 
     71     // To decide if the stroke contains a point we create two rects which represent the inner and
     72     // the outer stroke borders. A stroke contains the point, if the point is between them.
     73     m_innerStrokeRect = m_fillBoundingBox;
     74     m_outerStrokeRect = m_fillBoundingBox;
     75 
     76     if (style()->svgStyle()->hasStroke()) {
     77         float strokeWidth = this->strokeWidth();
     78         m_innerStrokeRect.inflate(-strokeWidth / 2);
     79         m_outerStrokeRect.inflate(strokeWidth / 2);
     80     }
     81 
     82     m_strokeBoundingBox = m_outerStrokeRect;
     83 }
     84 
     85 void RenderSVGRect::fillShape(GraphicsContext* context) const
     86 {
     87     if (m_usePathFallback) {
     88         RenderSVGShape::fillShape(context);
     89         return;
     90     }
     91 
     92     context->fillRect(m_fillBoundingBox);
     93 }
     94 
     95 void RenderSVGRect::strokeShape(GraphicsContext* context) const
     96 {
     97     if (!style()->svgStyle()->hasVisibleStroke())
     98         return;
     99 
    100     if (m_usePathFallback) {
    101         RenderSVGShape::strokeShape(context);
    102         return;
    103     }
    104 
    105     context->strokeRect(m_fillBoundingBox, strokeWidth());
    106 }
    107 
    108 bool RenderSVGRect::shapeDependentStrokeContains(const FloatPoint& point)
    109 {
    110     // The optimized contains code below does not support non-smooth strokes so we need
    111     // to fall back to RenderSVGShape::shapeDependentStrokeContains in these cases.
    112     if (m_usePathFallback || !hasSmoothStroke()) {
    113         if (!hasPath())
    114             RenderSVGShape::updateShapeFromElement();
    115         return RenderSVGShape::shapeDependentStrokeContains(point);
    116     }
    117 
    118     return m_outerStrokeRect.contains(point, FloatRect::InsideOrOnStroke) && !m_innerStrokeRect.contains(point, FloatRect::InsideButNotOnStroke);
    119 }
    120 
    121 bool RenderSVGRect::shapeDependentFillContains(const FloatPoint& point, const WindRule fillRule) const
    122 {
    123     if (m_usePathFallback)
    124         return RenderSVGShape::shapeDependentFillContains(point, fillRule);
    125     return m_fillBoundingBox.contains(point.x(), point.y());
    126 }
    127 
    128 }
    129