1/*
2 * Copyright (C) 2004, 2005 Nikolas Zimmermann <zimmermann@kde.org>
3 * Copyright (C) 2004, 2005, 2006 Rob Buis <buis@kde.org>
4 * Copyright (C) 2009 Google, Inc.
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14 * Library General Public License for more details.
15 *
16 * You should have received a copy of the GNU Library General Public License
17 * along with this library; see the file COPYING.LIB.  If not, write to
18 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
19 * Boston, MA 02110-1301, USA.
20 */
21
22#include "config.h"
23
24#include "core/rendering/svg/RenderSVGTransformableContainer.h"
25
26#include "SVGNames.h"
27#include "core/rendering/svg/SVGRenderSupport.h"
28#include "core/svg/SVGGraphicsElement.h"
29#include "core/svg/SVGUseElement.h"
30
31namespace WebCore {
32
33RenderSVGTransformableContainer::RenderSVGTransformableContainer(SVGGraphicsElement* node)
34    : RenderSVGContainer(node)
35    , m_needsTransformUpdate(true)
36    , m_didTransformToRootUpdate(false)
37{
38}
39
40bool RenderSVGTransformableContainer::calculateLocalTransform()
41{
42    SVGGraphicsElement* element = toSVGGraphicsElement(this->element());
43
44    // If we're either the renderer for a <use> element, or for any <g> element inside the shadow
45    // tree, that was created during the use/symbol/svg expansion in SVGUseElement. These containers
46    // need to respect the translations induced by their corresponding use elements x/y attributes.
47    SVGUseElement* useElement = 0;
48    if (element->hasTagName(SVGNames::useTag))
49        useElement = toSVGUseElement(element);
50    else if (element->isInShadowTree() && element->hasTagName(SVGNames::gTag)) {
51        SVGElement* correspondingElement = element->correspondingElement();
52        if (correspondingElement && correspondingElement->hasTagName(SVGNames::useTag))
53            useElement = toSVGUseElement(correspondingElement);
54    }
55
56    if (useElement) {
57        SVGLengthContext lengthContext(useElement);
58        FloatSize translation(useElement->xCurrentValue().value(lengthContext), useElement->yCurrentValue().value(lengthContext));
59        if (translation != m_lastTranslation)
60            m_needsTransformUpdate = true;
61        m_lastTranslation = translation;
62    }
63
64    m_didTransformToRootUpdate = m_needsTransformUpdate || SVGRenderSupport::transformToRootChanged(parent());
65    if (!m_needsTransformUpdate)
66        return false;
67
68    m_localTransform = element->animatedLocalTransform();
69    m_localTransform.translate(m_lastTranslation.width(), m_lastTranslation.height());
70    m_needsTransformUpdate = false;
71    return true;
72}
73
74}
75