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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 #if ENABLE(SVG)
25 #include "RenderSVGTransformableContainer.h"
26 
27 #include "SVGNames.h"
28 #include "SVGShadowTreeElements.h"
29 #include "SVGStyledTransformableElement.h"
30 
31 namespace WebCore {
32 
RenderSVGTransformableContainer(SVGStyledTransformableElement * node)33 RenderSVGTransformableContainer::RenderSVGTransformableContainer(SVGStyledTransformableElement* node)
34     : RenderSVGContainer(node)
35     , m_needsTransformUpdate(true)
36 {
37 }
38 
calculateLocalTransform()39 bool RenderSVGTransformableContainer::calculateLocalTransform()
40 {
41     SVGStyledTransformableElement* element = static_cast<SVGStyledTransformableElement*>(node());
42 
43     bool needsUpdate = m_needsTransformUpdate;
44     if (needsUpdate) {
45         m_localTransform = element->animatedLocalTransform();
46         m_needsTransformUpdate = false;
47     }
48 
49     if (!element->hasTagName(SVGNames::gTag) || !static_cast<SVGGElement*>(element)->isShadowTreeContainerElement())
50         return needsUpdate;
51 
52     FloatSize translation = static_cast<SVGShadowTreeContainerElement*>(element)->containerTranslation();
53     if (!translation.width() && !translation.height())
54         return needsUpdate;
55 
56     // FIXME: Could optimize this case for use to avoid refetching the animatedLocalTransform() here, if only the containerTranslation() changed.
57     if (!needsUpdate)
58         m_localTransform = element->animatedLocalTransform();
59 
60     m_localTransform.translate(translation.width(), translation.height());
61     return true;
62 }
63 
64 }
65 
66 #endif // ENABLE(SVG)
67