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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 #include "core/rendering/svg/RenderSVGViewportContainer.h"
     25 
     26 #include "core/rendering/PaintInfo.h"
     27 #include "core/rendering/svg/SVGRenderSupport.h"
     28 #include "core/svg/SVGSVGElement.h"
     29 #include "core/svg/SVGUseElement.h"
     30 #include "platform/graphics/GraphicsContext.h"
     31 
     32 namespace blink {
     33 
     34 RenderSVGViewportContainer::RenderSVGViewportContainer(SVGElement* node)
     35     : RenderSVGContainer(node)
     36     , m_didTransformToRootUpdate(false)
     37     , m_isLayoutSizeChanged(false)
     38     , m_needsTransformUpdate(true)
     39 {
     40 }
     41 
     42 void RenderSVGViewportContainer::determineIfLayoutSizeChanged()
     43 {
     44     ASSERT(element());
     45     if (!isSVGSVGElement(*element()))
     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     ASSERT(element);
     61     if (!isSVGSVGElement(*element))
     62         return;
     63     SVGSVGElement* svg = toSVGSVGElement(element);
     64     FloatRect oldViewport = m_viewport;
     65 
     66     SVGLengthContext lengthContext(element);
     67     m_viewport = FloatRect(svg->x()->currentValue()->value(lengthContext), svg->y()->currentValue()->value(lengthContext), svg->width()->currentValue()->value(lengthContext), svg->height()->currentValue()->value(lengthContext));
     68 
     69     if (oldViewport != m_viewport) {
     70         setNeedsBoundariesUpdate();
     71         setNeedsTransformUpdate();
     72     }
     73 }
     74 
     75 bool RenderSVGViewportContainer::calculateLocalTransform()
     76 {
     77     m_didTransformToRootUpdate = m_needsTransformUpdate || SVGRenderSupport::transformToRootChanged(parent());
     78     if (!m_needsTransformUpdate)
     79         return false;
     80 
     81     m_localToParentTransform = AffineTransform::translation(m_viewport.x(), m_viewport.y()) * viewportTransform();
     82     m_needsTransformUpdate = false;
     83     return true;
     84 }
     85 
     86 AffineTransform RenderSVGViewportContainer::viewportTransform() const
     87 {
     88     ASSERT(element());
     89     if (isSVGSVGElement(*element())) {
     90         SVGSVGElement* svg = toSVGSVGElement(element());
     91         return svg->viewBoxToViewTransform(m_viewport.width(), m_viewport.height());
     92     }
     93 
     94     return AffineTransform();
     95 }
     96 
     97 bool RenderSVGViewportContainer::pointIsInsideViewportClip(const FloatPoint& pointInParent)
     98 {
     99     // Respect the viewport clip (which is in parent coords)
    100     if (!SVGRenderSupport::isOverflowHidden(this))
    101         return true;
    102 
    103     return m_viewport.contains(pointInParent);
    104 }
    105 
    106 void RenderSVGViewportContainer::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
    107 {
    108     ASSERT(element());
    109     // An empty viewBox disables rendering.
    110     if (isSVGSVGElement(*element()) && toSVGSVGElement(*element()).hasEmptyViewBox())
    111         return;
    112 
    113     RenderSVGContainer::paint(paintInfo, paintOffset);
    114 }
    115 
    116 }
    117