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
33namespace WebCore {
34
35RenderSVGViewportContainer::RenderSVGViewportContainer(SVGElement* node)
36    : RenderSVGContainer(node)
37    , m_didTransformToRootUpdate(false)
38    , m_isLayoutSizeChanged(false)
39    , m_needsTransformUpdate(true)
40{
41}
42
43void RenderSVGViewportContainer::determineIfLayoutSizeChanged()
44{
45    if (!element()->hasTagName(SVGNames::svgTag))
46        return;
47
48    m_isLayoutSizeChanged = toSVGSVGElement(element())->hasRelativeLengths() && selfNeedsLayout();
49}
50
51void RenderSVGViewportContainer::applyViewportClip(PaintInfo& paintInfo)
52{
53    if (SVGRenderSupport::isOverflowHidden(this))
54        paintInfo.context->clip(m_viewport);
55}
56
57void 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
120bool 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
131AffineTransform 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
141bool 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
150void 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