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      1 /*
      2  * Copyright (C) 2004, 2005 Nikolas Zimmermann <zimmermann (at) kde.org>
      3  * Copyright (C) 2004, 2005, 2006 Rob Buis <buis (at) kde.org>
      4  * Copyright (C) 2009 Google, Inc.  All rights reserved.
      5  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
      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 #if ENABLE(SVG)
     26 #include "SVGLocatable.h"
     27 
     28 #include "RenderObject.h"
     29 #include "SVGException.h"
     30 #include "SVGNames.h"
     31 #include "SVGStyledLocatableElement.h"
     32 
     33 namespace WebCore {
     34 
     35 static bool isViewportElement(Node* node)
     36 {
     37     return (node->hasTagName(SVGNames::svgTag)
     38         || node->hasTagName(SVGNames::symbolTag)
     39 #if ENABLE(SVG_FOREIGN_OBJECT)
     40         || node->hasTagName(SVGNames::foreignObjectTag)
     41 #endif
     42         || node->hasTagName(SVGNames::imageTag));
     43 }
     44 
     45 SVGElement* SVGLocatable::nearestViewportElement(const SVGElement* element)
     46 {
     47     ASSERT(element);
     48     for (ContainerNode* n = element->parentNode(); n; n = n->parentNode()) {
     49         if (isViewportElement(n))
     50             return static_cast<SVGElement*>(n);
     51     }
     52 
     53     return 0;
     54 }
     55 
     56 SVGElement* SVGLocatable::farthestViewportElement(const SVGElement* element)
     57 {
     58     ASSERT(element);
     59     SVGElement* farthest = 0;
     60     for (ContainerNode* n = element->parentNode(); n; n = n->parentNode()) {
     61         if (isViewportElement(n))
     62             farthest = static_cast<SVGElement*>(n);
     63     }
     64     return farthest;
     65 }
     66 
     67 FloatRect SVGLocatable::getBBox(const SVGElement* element, StyleUpdateStrategy styleUpdateStrategy)
     68 {
     69     ASSERT(element);
     70     if (styleUpdateStrategy == AllowStyleUpdate)
     71         element->document()->updateLayoutIgnorePendingStylesheets();
     72 
     73     // FIXME: Eventually we should support getBBox for detached elements.
     74     if (!element->renderer())
     75         return FloatRect();
     76 
     77     return element->renderer()->objectBoundingBox();
     78 }
     79 
     80 AffineTransform SVGLocatable::computeCTM(const SVGElement* element, CTMScope mode, StyleUpdateStrategy styleUpdateStrategy)
     81 {
     82     ASSERT(element);
     83     if (styleUpdateStrategy == AllowStyleUpdate)
     84         element->document()->updateLayoutIgnorePendingStylesheets();
     85 
     86     AffineTransform ctm;
     87 
     88     SVGElement* stopAtElement = mode == NearestViewportScope ? nearestViewportElement(element) : 0;
     89 
     90     Node* current = const_cast<SVGElement*>(element);
     91     while (current && current->isSVGElement()) {
     92         SVGElement* currentElement = static_cast<SVGElement*>(current);
     93         if (currentElement->isStyled())
     94             // note that this modifies the AffineTransform returned by localCoordinateSpaceTransform(mode) too.
     95             ctm = static_cast<SVGStyledElement*>(currentElement)->localCoordinateSpaceTransform(mode).multiply(ctm);
     96 
     97         // For getCTM() computation, stop at the nearest viewport element
     98         if (currentElement == stopAtElement)
     99             break;
    100 
    101         current = current->parentOrHostNode();
    102     }
    103 
    104     return ctm;
    105 }
    106 
    107 AffineTransform SVGLocatable::getTransformToElement(SVGElement* target, ExceptionCode& ec, StyleUpdateStrategy styleUpdateStrategy) const
    108 {
    109     AffineTransform ctm = getCTM(styleUpdateStrategy);
    110 
    111     if (target && target->isStyledLocatable()) {
    112         AffineTransform targetCTM = static_cast<SVGStyledLocatableElement*>(target)->getCTM(styleUpdateStrategy);
    113         if (!targetCTM.isInvertible()) {
    114             ec = SVGException::SVG_MATRIX_NOT_INVERTABLE;
    115             return ctm;
    116         }
    117         ctm = targetCTM.inverse() * ctm;
    118     }
    119 
    120     return ctm;
    121 }
    122 
    123 }
    124 
    125 #endif // ENABLE(SVG)
    126