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      1 /*
      2  * Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann (at) kde.org>
      3  * Copyright (C) 2004, 2005, 2007 Rob Buis <buis (at) kde.org>
      4  * Copyright (C) 2007 Eric Seidel <eric (at) 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 
     35 RenderSVGViewportContainer::RenderSVGViewportContainer(SVGElement* node)
     36     : RenderSVGContainer(node)
     37     , m_didTransformToRootUpdate(false)
     38     , m_isLayoutSizeChanged(false)
     39     , m_needsTransformUpdate(true)
     40 {
     41 }
     42 
     43 void RenderSVGViewportContainer::determineIfLayoutSizeChanged()
     44 {
     45     if (!element()->hasTagName(SVGNames::svgTag))
     46         return;
     47 
     48     m_isLayoutSizeChanged = toSVGSVGElement(element())->hasRelativeLengths() && selfNeedsLayout();
     49 }
     50 
     51 void RenderSVGViewportContainer::applyViewportClip(PaintInfo& paintInfo)
     52 {
     53     if (SVGRenderSupport::isOverflowHidden(this))
     54         paintInfo.context->clip(m_viewport);
     55 }
     56 
     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 
    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 
    131 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 
    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 
    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