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      1 /*
      2  * Copyright (C) 2008, 2011 Apple Inc. All rights reserved.
      3  *
      4  * This library is free software; you can redistribute it and/or
      5  * modify it under the terms of the GNU Library General Public
      6  * License as published by the Free Software Foundation; either
      7  * version 2 of the License, or (at your option) any later version.
      8  *
      9  * This library is distributed in the hope that it will be useful,
     10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     12  * Library General Public License for more details.
     13  *
     14  * You should have received a copy of the GNU Library General Public License
     15  * along with this library; see the file COPYING.LIB.  If not, write to
     16  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     17  * Boston, MA 02110-1301, USA.
     18  *
     19  */
     20 
     21 #include "config.h"
     22 #include "HTMLPlugInImageElement.h"
     23 
     24 #include "Frame.h"
     25 #include "FrameLoader.h"
     26 #include "FrameLoaderClient.h"
     27 #include "HTMLImageLoader.h"
     28 #include "HTMLNames.h"
     29 #include "Image.h"
     30 #include "Page.h"
     31 #include "RenderEmbeddedObject.h"
     32 #include "RenderImage.h"
     33 
     34 namespace WebCore {
     35 
     36 HTMLPlugInImageElement::HTMLPlugInImageElement(const QualifiedName& tagName, Document* document, bool createdByParser, PreferPlugInsForImagesOption preferPlugInsForImagesOption)
     37     : HTMLPlugInElement(tagName, document)
     38     // m_needsWidgetUpdate(!createdByParser) allows HTMLObjectElement to delay
     39     // widget updates until after all children are parsed.  For HTMLEmbedElement
     40     // this delay is unnecessary, but it is simpler to make both classes share
     41     // the same codepath in this class.
     42     , m_needsWidgetUpdate(!createdByParser)
     43     , m_shouldPreferPlugInsForImages(preferPlugInsForImagesOption == ShouldPreferPlugInsForImages)
     44 {
     45 }
     46 
     47 RenderEmbeddedObject* HTMLPlugInImageElement::renderEmbeddedObject() const
     48 {
     49     // HTMLObjectElement and HTMLEmbedElement may return arbitrary renderers
     50     // when using fallback content.
     51     if (!renderer() || !renderer()->isEmbeddedObject())
     52         return 0;
     53     return toRenderEmbeddedObject(renderer());
     54 }
     55 
     56 bool HTMLPlugInImageElement::isImageType()
     57 {
     58     if (m_serviceType.isEmpty() && protocolIs(m_url, "data"))
     59         m_serviceType = mimeTypeFromDataURL(m_url);
     60 
     61     if (Frame* frame = document()->frame()) {
     62         KURL completedURL = frame->loader()->completeURL(m_url);
     63         return frame->loader()->client()->objectContentType(completedURL, m_serviceType, shouldPreferPlugInsForImages()) == ObjectContentImage;
     64     }
     65 
     66     return Image::supportsType(m_serviceType);
     67 }
     68 
     69 // We don't use m_url, as it may not be the final URL that the object loads,
     70 // depending on <param> values.
     71 bool HTMLPlugInImageElement::allowedToLoadFrameURL(const String& url)
     72 {
     73     ASSERT(document());
     74     ASSERT(document()->frame());
     75     if (document()->frame()->page()->frameCount() >= Page::maxNumberOfFrames)
     76         return false;
     77 
     78     // We allow one level of self-reference because some sites depend on that.
     79     // But we don't allow more than one.
     80     KURL completeURL = document()->completeURL(url);
     81     bool foundSelfReference = false;
     82     for (Frame* frame = document()->frame(); frame; frame = frame->tree()->parent()) {
     83         if (equalIgnoringFragmentIdentifier(frame->document()->url(), completeURL)) {
     84             if (foundSelfReference)
     85                 return false;
     86             foundSelfReference = true;
     87         }
     88     }
     89     return true;
     90 }
     91 
     92 // We don't use m_url, or m_serviceType as they may not be the final values
     93 // that <object> uses depending on <param> values.
     94 bool HTMLPlugInImageElement::wouldLoadAsNetscapePlugin(const String& url, const String& serviceType)
     95 {
     96     ASSERT(document());
     97     ASSERT(document()->frame());
     98     FrameLoader* frameLoader = document()->frame()->loader();
     99     ASSERT(frameLoader);
    100     KURL completedURL;
    101     if (!url.isEmpty())
    102         completedURL = frameLoader->completeURL(url);
    103 
    104     if (frameLoader->client()->objectContentType(completedURL, serviceType, shouldPreferPlugInsForImages()) == ObjectContentNetscapePlugin)
    105         return true;
    106     return false;
    107 }
    108 
    109 RenderObject* HTMLPlugInImageElement::createRenderer(RenderArena* arena, RenderStyle* style)
    110 {
    111     // Fallback content breaks the DOM->Renderer class relationship of this
    112     // class and all superclasses because createObject won't necessarily
    113     // return a RenderEmbeddedObject, RenderPart or even RenderWidget.
    114     if (useFallbackContent())
    115         return RenderObject::createObject(this, style);
    116     if (isImageType()) {
    117         RenderImage* image = new (arena) RenderImage(this);
    118         image->setImageResource(RenderImageResource::create());
    119         return image;
    120     }
    121     return new (arena) RenderEmbeddedObject(this);
    122 }
    123 
    124 void HTMLPlugInImageElement::recalcStyle(StyleChange ch)
    125 {
    126     // FIXME: Why is this necessary?  Manual re-attach is almost always wrong.
    127     if (!useFallbackContent() && needsWidgetUpdate() && renderer() && !isImageType()) {
    128         detach();
    129         attach();
    130     }
    131     HTMLPlugInElement::recalcStyle(ch);
    132 }
    133 
    134 void HTMLPlugInImageElement::attach()
    135 {
    136     bool isImage = isImageType();
    137 
    138     if (!isImage)
    139         queuePostAttachCallback(&HTMLPlugInImageElement::updateWidgetCallback, this);
    140 
    141     HTMLPlugInElement::attach();
    142 
    143     if (isImage && renderer() && !useFallbackContent()) {
    144         if (!m_imageLoader)
    145             m_imageLoader = adoptPtr(new HTMLImageLoader(this));
    146         m_imageLoader->updateFromElement();
    147     }
    148 }
    149 
    150 void HTMLPlugInImageElement::detach()
    151 {
    152     // FIXME: Because of the insanity that is HTMLPlugInImageElement::recalcStyle,
    153     // we can end up detaching during an attach() call, before we even have a
    154     // renderer.  In that case, don't mark the widget for update.
    155     if (attached() && renderer() && !useFallbackContent())
    156         // Update the widget the next time we attach (detaching destroys the plugin).
    157         setNeedsWidgetUpdate(true);
    158     HTMLPlugInElement::detach();
    159 }
    160 
    161 void HTMLPlugInImageElement::updateWidgetIfNecessary()
    162 {
    163     document()->updateStyleIfNeeded();
    164 
    165     if (!needsWidgetUpdate() || useFallbackContent() || isImageType())
    166         return;
    167 
    168     if (!renderEmbeddedObject() || renderEmbeddedObject()->pluginCrashedOrWasMissing())
    169         return;
    170 
    171     updateWidget(CreateOnlyNonNetscapePlugins);
    172 }
    173 
    174 void HTMLPlugInImageElement::finishParsingChildren()
    175 {
    176     HTMLPlugInElement::finishParsingChildren();
    177     if (useFallbackContent())
    178         return;
    179 
    180     setNeedsWidgetUpdate(true);
    181     if (inDocument())
    182         setNeedsStyleRecalc();
    183 }
    184 
    185 void HTMLPlugInImageElement::willMoveToNewOwnerDocument()
    186 {
    187     if (m_imageLoader)
    188         m_imageLoader->elementWillMoveToNewOwnerDocument();
    189     HTMLPlugInElement::willMoveToNewOwnerDocument();
    190 }
    191 
    192 void HTMLPlugInImageElement::updateWidgetCallback(Node* n)
    193 {
    194     static_cast<HTMLPlugInImageElement*>(n)->updateWidgetIfNecessary();
    195 }
    196 
    197 } // namespace WebCore
    198