C++ HTMLImageElement::fastGetAttribute方法代码示例

HTMLAreaElement* HitTestResult::imageAreaForImage() const
{
    ASSERT(m_innerNode);
    HTMLImageElement* imageElement = nullptr;
    if (isHTMLImageElement(m_innerNode)) {
        imageElement = toHTMLImageElement(m_innerNode);
    } else if (m_innerNode->isInShadowTree()) {
        if (m_innerNode->containingShadowRoot()->type() == ShadowRootType::UserAgent) {
            if (isHTMLImageElement(m_innerNode->shadowHost()))
                imageElement = toHTMLImageElement(m_innerNode->shadowHost());
        }
    }

    if (!imageElement || !imageElement->layoutObject() || !imageElement->layoutObject()->isBox())
        return nullptr;

    HTMLMapElement* map = imageElement->treeScope().getImageMap(imageElement->fastGetAttribute(usemapAttr));
    if (!map)
        return nullptr;

    LayoutBox* box = toLayoutBox(imageElement->layoutObject());
    LayoutRect contentBox = box->contentBoxRect();
    float scaleFactor = 1 / box->style()->effectiveZoom();
    LayoutPoint location = localPoint();
    location.scale(scaleFactor, scaleFactor);

    return map->areaForPoint(location, contentBox.size());
}

void PageSerializer::serializeFrame(Frame* frame)
{
    Document* document = frame->document();
    URL url = document->url();
    if (!url.isValid() || url.isBlankURL()) {
        // For blank frames we generate a fake URL so they can be referenced by their containing frame.
        url = urlForBlankFrame(frame);
    }

    if (m_resourceURLs.contains(url)) {
        // FIXME: We could have 2 frame with the same URL but which were dynamically changed and have now
        // different content. So we should serialize both and somehow rename the frame src in the containing
        // frame. Arg!
        return;
    }

    Vector<Node*> nodes;
    SerializerMarkupAccumulator accumulator(*this, *document, &nodes);
    TextEncoding textEncoding(document->charset());
    CString data;
    if (!textEncoding.isValid()) {
        // FIXME: iframes used as images trigger this. We should deal with them correctly.
        return;
    }
    String text = accumulator.serializeNodes(*document->documentElement(), 0, IncludeNode);
    CString frameHTML = textEncoding.encode(text, EntitiesForUnencodables);
    m_resources->append(Resource(url, document->suggestedMIMEType(), SharedBuffer::create(frameHTML.data(), frameHTML.length())));
    m_resourceURLs.add(url);

    for (Vector<Node*>::iterator iter = nodes.begin(); iter != nodes.end(); ++iter) {
        Node* node = *iter;
        if (!node->isElementNode())
            continue;

        Element* element = toElement(node);
        // We have to process in-line style as it might contain some resources (typically background images).
        if (element->isStyledElement())
            retrieveResourcesForProperties(toStyledElement(element)->inlineStyle(), document);

        if (isHTMLImageElement(element)) {
            HTMLImageElement* imageElement = toHTMLImageElement(element);
            URL url = document->completeURL(imageElement->fastGetAttribute(HTMLNames::srcAttr));
            CachedImage* cachedImage = imageElement->cachedImage();
            addImageToResources(cachedImage, imageElement->renderer(), url);
        } else if (element->hasTagName(HTMLNames::linkTag)) {
            HTMLLinkElement* linkElement = toHTMLLinkElement(element);
            if (CSSStyleSheet* sheet = linkElement->sheet()) {
                URL url = document->completeURL(linkElement->getAttribute(HTMLNames::hrefAttr));
                serializeCSSStyleSheet(sheet, url);
                ASSERT(m_resourceURLs.contains(url));
            }
        } else if (isHTMLStyleElement(element)) {
            if (CSSStyleSheet* sheet = toHTMLStyleElement(element)->sheet())
                serializeCSSStyleSheet(sheet, URL());
        }
    }

    for (Frame* childFrame = frame->tree().firstChild(); childFrame; childFrame = childFrame->tree().nextSibling())
        serializeFrame(childFrame);
}

static HTMLElement* firstNamedItem(const Vector<FormAssociatedElement*>& elementsArray,
                                   const Vector<HTMLImageElement*>* imageElementsArray, const QualifiedName& attrName, const String& name)
{
    ASSERT(attrName == idAttr || attrName == nameAttr);

    for (unsigned i = 0; i < elementsArray.size(); ++i) {
        HTMLElement* element = toHTMLElement(elementsArray[i]);
        if (elementsArray[i]->isEnumeratable() && element->fastGetAttribute(attrName) == name)
            return element;
    }

    if (!imageElementsArray)
        return 0;

    for (unsigned i = 0; i < imageElementsArray->size(); ++i) {
        HTMLImageElement* element = (*imageElementsArray)[i];
        if (element->fastGetAttribute(attrName) == name)
            return element;
    }

    return 0;
}

static HTMLElement* firstNamedItem(const FormAssociatedElement::List& elementsArray,
    const WillBeHeapVector<RawPtrWillBeMember<HTMLImageElement>>* imageElementsArray, const QualifiedName& attrName, const String& name)
{
    ASSERT(attrName == idAttr || attrName == nameAttr);

    for (unsigned i = 0; i < elementsArray.size(); ++i) {
        HTMLElement* element = toHTMLElement(elementsArray[i]);
        if (elementsArray[i]->isEnumeratable() && element->fastGetAttribute(attrName) == name)
            return element;
    }

    if (!imageElementsArray)
        return nullptr;

    for (unsigned i = 0; i < imageElementsArray->size(); ++i) {
        HTMLImageElement* element = (*imageElementsArray)[i];
        if (element->fastGetAttribute(attrName) == name) {
            UseCounter::count(element->document(), UseCounter::FormNameAccessForImageElement);
            return element;
        }
    }

    return nullptr;
}

HTMLMapElement* LayoutImage::imageMap() const
{
    HTMLImageElement* i = isHTMLImageElement(node()) ? toHTMLImageElement(node()) : 0;
    return i ? i->treeScope().getImageMap(i->fastGetAttribute(usemapAttr)) : 0;
}

HTMLMapElement* RenderImage::imageMap() const
{
    HTMLImageElement* i = node() && node()->hasTagName(imgTag) ? static_cast<HTMLImageElement*>(node()) : 0;
    return i ? i->treeScope()->getImageMap(i->fastGetAttribute(usemapAttr)) : 0;
}

HTMLMapElement* RenderImage::imageMap() const
{
    HTMLImageElement* image = is<HTMLImageElement>(element()) ? downcast<HTMLImageElement>(element()) : nullptr;
    return image ? image->treeScope().getImageMap(image->fastGetAttribute(usemapAttr)) : nullptr;
}