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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 #include "platform/graphics/GraphicsContext.h"
     32 
     33 namespace blink {
     34 
     35 RenderSVGRect::RenderSVGRect(SVGRectElement* node)
     36     : RenderSVGShape(node)
     37     , m_usePathFallback(false)
     38 {
     39 }
     40 
     41 RenderSVGRect::~RenderSVGRect()
     42 {
     43 }
     44 
     45 void RenderSVGRect::updateShapeFromElement()
     46 {
     47     // Before creating a new object we need to clear the cached bounding box
     48     // to avoid using garbage.
     49     m_fillBoundingBox = FloatRect();
     50     m_innerStrokeRect = FloatRect();
     51     m_outerStrokeRect = FloatRect();
     52     m_usePathFallback = false;
     53     SVGRectElement* rect = toSVGRectElement(element());
     54     ASSERT(rect);
     55 
     56     SVGLengthContext lengthContext(rect);
     57     FloatSize boundingBoxSize(rect->width()->currentValue()->value(lengthContext), rect->height()->currentValue()->value(lengthContext));
     58 
     59     // Spec: "A negative value is an error."
     60     if (boundingBoxSize.width() < 0 || boundingBoxSize.height() < 0)
     61         return;
     62 
     63     // Spec: "A value of zero disables rendering of the element."
     64     if (!boundingBoxSize.isEmpty()) {
     65         // Fallback to RenderSVGShape if rect has rounded corners or a non-scaling stroke.
     66         if (rect->rx()->currentValue()->value(lengthContext) > 0 || rect->ry()->currentValue()->value(lengthContext) > 0 || hasNonScalingStroke()) {
     67             RenderSVGShape::updateShapeFromElement();
     68             m_usePathFallback = true;
     69             return;
     70         }
     71     }
     72 
     73     m_fillBoundingBox = FloatRect(FloatPoint(rect->x()->currentValue()->value(lengthContext), rect->y()->currentValue()->value(lengthContext)), boundingBoxSize);
     74 
     75     // To decide if the stroke contains a point we create two rects which represent the inner and
     76     // the outer stroke borders. A stroke contains the point, if the point is between them.
     77     m_innerStrokeRect = m_fillBoundingBox;
     78     m_outerStrokeRect = m_fillBoundingBox;
     79 
     80     if (style()->svgStyle().hasStroke()) {
     81         float strokeWidth = this->strokeWidth();
     82         m_innerStrokeRect.inflate(-strokeWidth / 2);
     83         m_outerStrokeRect.inflate(strokeWidth / 2);
     84     }
     85 
     86     m_strokeBoundingBox = m_outerStrokeRect;
     87 }
     88 
     89 void RenderSVGRect::fillShape(GraphicsContext* context) const
     90 {
     91     if (m_usePathFallback) {
     92         RenderSVGShape::fillShape(context);
     93         return;
     94     }
     95 
     96     context->fillRect(m_fillBoundingBox);
     97 }
     98 
     99 void RenderSVGRect::strokeShape(GraphicsContext* context) const
    100 {
    101     if (!style()->svgStyle().hasVisibleStroke())
    102         return;
    103 
    104     if (m_usePathFallback) {
    105         RenderSVGShape::strokeShape(context);
    106         return;
    107     }
    108 
    109     context->strokeRect(m_fillBoundingBox, strokeWidth());
    110 }
    111 
    112 bool RenderSVGRect::shapeDependentStrokeContains(const FloatPoint& point)
    113 {
    114     // The optimized contains code below does not support non-smooth strokes so we need
    115     // to fall back to RenderSVGShape::shapeDependentStrokeContains in these cases.
    116     if (m_usePathFallback || !hasSmoothStroke()) {
    117         if (!hasPath())
    118             RenderSVGShape::updateShapeFromElement();
    119         return RenderSVGShape::shapeDependentStrokeContains(point);
    120     }
    121 
    122     return m_outerStrokeRect.contains(point, FloatRect::InsideOrOnStroke) && !m_innerStrokeRect.contains(point, FloatRect::InsideButNotOnStroke);
    123 }
    124 
    125 bool RenderSVGRect::shapeDependentFillContains(const FloatPoint& point, const WindRule fillRule) const
    126 {
    127     if (m_usePathFallback)
    128         return RenderSVGShape::shapeDependentFillContains(point, fillRule);
    129     return m_fillBoundingBox.contains(point.x(), point.y());
    130 }
    131 
    132 }
    133