1/*
2 * Copyright (C) 2011 University of Szeged
3 * Copyright (C) 2011 Renata Hodovan <reni@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
33namespace blink {
34
35RenderSVGRect::RenderSVGRect(SVGRectElement* node)
36    : RenderSVGShape(node)
37    , m_usePathFallback(false)
38{
39}
40
41RenderSVGRect::~RenderSVGRect()
42{
43}
44
45void 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
89void 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
99void 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
112bool 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
125bool 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