1 /*
2 * Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
3 * Copyright (C) 2004, 2005, 2007 Rob Buis <buis@kde.org>
4 * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
5 * Copyright (C) 2009 Google, Inc.
6 *
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
16 *
17 * You should have received a copy of the GNU Library General Public License
18 * along with this library; see the file COPYING.LIB. If not, write to
19 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
20 * Boston, MA 02110-1301, USA.
21 */
22
23 #include "config.h"
24
25 #include "core/rendering/svg/RenderSVGViewportContainer.h"
26
27 #include "SVGNames.h"
28 #include "core/svg/SVGElementInstance.h"
29 #include "core/svg/SVGSVGElement.h"
30 #include "core/svg/SVGUseElement.h"
31 #include "platform/graphics/GraphicsContext.h"
32
33 namespace WebCore {
34
RenderSVGViewportContainer(SVGElement * node)35 RenderSVGViewportContainer::RenderSVGViewportContainer(SVGElement* node)
36 : RenderSVGContainer(node)
37 , m_didTransformToRootUpdate(false)
38 , m_isLayoutSizeChanged(false)
39 , m_needsTransformUpdate(true)
40 {
41 }
42
determineIfLayoutSizeChanged()43 void RenderSVGViewportContainer::determineIfLayoutSizeChanged()
44 {
45 if (!element()->hasTagName(SVGNames::svgTag))
46 return;
47
48 m_isLayoutSizeChanged = toSVGSVGElement(element())->hasRelativeLengths() && selfNeedsLayout();
49 }
50
applyViewportClip(PaintInfo & paintInfo)51 void RenderSVGViewportContainer::applyViewportClip(PaintInfo& paintInfo)
52 {
53 if (SVGRenderSupport::isOverflowHidden(this))
54 paintInfo.context->clip(m_viewport);
55 }
56
calcViewport()57 void RenderSVGViewportContainer::calcViewport()
58 {
59 SVGElement* element = this->element();
60 if (!element->hasTagName(SVGNames::svgTag))
61 return;
62 SVGSVGElement* svg = toSVGSVGElement(element);
63 FloatRect oldViewport = m_viewport;
64
65 SVGLengthContext lengthContext(element);
66 m_viewport = FloatRect(svg->xCurrentValue().value(lengthContext), svg->yCurrentValue().value(lengthContext), svg->widthCurrentValue().value(lengthContext), svg->heightCurrentValue().value(lengthContext));
67
68 SVGElement* correspondingElement = svg->correspondingElement();
69 if (correspondingElement && svg->isInShadowTree()) {
70 const HashSet<SVGElementInstance*>& instances = correspondingElement->instancesForElement();
71 ASSERT(!instances.isEmpty());
72
73 SVGUseElement* useElement = 0;
74 const HashSet<SVGElementInstance*>::const_iterator end = instances.end();
75 for (HashSet<SVGElementInstance*>::const_iterator it = instances.begin(); it != end; ++it) {
76 const SVGElementInstance* instance = (*it);
77 ASSERT(instance->correspondingElement()->hasTagName(SVGNames::svgTag) || instance->correspondingElement()->hasTagName(SVGNames::symbolTag));
78 if (instance->shadowTreeElement() == svg) {
79 ASSERT(correspondingElement == instance->correspondingElement());
80 useElement = instance->directUseElement();
81 if (!useElement)
82 useElement = instance->correspondingUseElement();
83 break;
84 }
85 }
86
87 ASSERT(useElement);
88 bool isSymbolElement = correspondingElement->hasTagName(SVGNames::symbolTag);
89
90 // Spec (<use> on <symbol>): This generated 'svg' will always have explicit values for attributes width and height.
91 // If attributes width and/or height are provided on the 'use' element, then these attributes
92 // will be transferred to the generated 'svg'. If attributes width and/or height are not specified,
93 // the generated 'svg' element will use values of 100% for these attributes.
94
95 // Spec (<use> on <svg>): If attributes width and/or height are provided on the 'use' element, then these
96 // values will override the corresponding attributes on the 'svg' in the generated tree.
97
98 SVGLengthContext lengthContext(element);
99 if (useElement->hasAttribute(SVGNames::widthAttr))
100 m_viewport.setWidth(useElement->widthCurrentValue().value(lengthContext));
101 else if (isSymbolElement && svg->hasAttribute(SVGNames::widthAttr)) {
102 SVGLength containerWidth(LengthModeWidth, "100%");
103 m_viewport.setWidth(containerWidth.value(lengthContext));
104 }
105
106 if (useElement->hasAttribute(SVGNames::heightAttr))
107 m_viewport.setHeight(useElement->heightCurrentValue().value(lengthContext));
108 else if (isSymbolElement && svg->hasAttribute(SVGNames::heightAttr)) {
109 SVGLength containerHeight(LengthModeHeight, "100%");
110 m_viewport.setHeight(containerHeight.value(lengthContext));
111 }
112 }
113
114 if (oldViewport != m_viewport) {
115 setNeedsBoundariesUpdate();
116 setNeedsTransformUpdate();
117 }
118 }
119
calculateLocalTransform()120 bool RenderSVGViewportContainer::calculateLocalTransform()
121 {
122 m_didTransformToRootUpdate = m_needsTransformUpdate || SVGRenderSupport::transformToRootChanged(parent());
123 if (!m_needsTransformUpdate)
124 return false;
125
126 m_localToParentTransform = AffineTransform::translation(m_viewport.x(), m_viewport.y()) * viewportTransform();
127 m_needsTransformUpdate = false;
128 return true;
129 }
130
viewportTransform() const131 AffineTransform RenderSVGViewportContainer::viewportTransform() const
132 {
133 if (element()->hasTagName(SVGNames::svgTag)) {
134 SVGSVGElement* svg = toSVGSVGElement(element());
135 return svg->viewBoxToViewTransform(m_viewport.width(), m_viewport.height());
136 }
137
138 return AffineTransform();
139 }
140
pointIsInsideViewportClip(const FloatPoint & pointInParent)141 bool RenderSVGViewportContainer::pointIsInsideViewportClip(const FloatPoint& pointInParent)
142 {
143 // Respect the viewport clip (which is in parent coords)
144 if (!SVGRenderSupport::isOverflowHidden(this))
145 return true;
146
147 return m_viewport.contains(pointInParent);
148 }
149
paint(PaintInfo & paintInfo,const LayoutPoint & paintOffset)150 void RenderSVGViewportContainer::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
151 {
152 // An empty viewBox disables rendering.
153 if (element()->hasTagName(SVGNames::svgTag)) {
154 if (toSVGSVGElement(element())->hasEmptyViewBox())
155 return;
156 }
157
158 RenderSVGContainer::paint(paintInfo, paintOffset);
159 }
160
161 }
162