C++ RenderImage类代码示例

void Pasteboard::writeImage(Element& element, const URL&, const String& title)
{
    if (!(element.renderer() && element.renderer()->isRenderImage()))
        return;

    RenderImage* renderer = toRenderImage(element.renderer());
    CachedImage* cachedImage = renderer->cachedImage();
    if (!cachedImage || cachedImage->errorOccurred())
        return;
    Image* image = cachedImage->imageForRenderer(renderer);
    ASSERT(image);

    m_dataObject->clearAll();

    URL url = getURLForImageElement(element);
    if (!url.isEmpty()) {
        m_dataObject->setURL(url, title);

        m_dataObject->setMarkup(createMarkup(element, IncludeNode, 0, ResolveAllURLs));
    }

    GRefPtr<GdkPixbuf> pixbuf = adoptGRef(image->getGdkPixbuf());
    m_dataObject->setImage(pixbuf.get());

    if (m_gtkClipboard)
        PasteboardHelper::defaultPasteboardHelper()->writeClipboardContents(m_gtkClipboard);
}

RenderObject* HTMLPlugInImageElement::createRenderer(RenderArena* arena, RenderStyle* style)
{
    // Once a PlugIn Element creates its renderer, it needs to be told when the Document goes
    // inactive or reactivates so it can clear the renderer before going into the page cache.
    if (!m_needsDocumentActivationCallbacks) {
        m_needsDocumentActivationCallbacks = true;
        document()->registerForPageCacheSuspensionCallbacks(this);
    }

    if (displayState() == DisplayingSnapshot) {
        RenderSnapshottedPlugIn* renderSnapshottedPlugIn = new (arena) RenderSnapshottedPlugIn(this);
        renderSnapshottedPlugIn->updateSnapshot(m_snapshotImage);
        return renderSnapshottedPlugIn;
    }

    // Fallback content breaks the DOM->Renderer class relationship of this
    // class and all superclasses because createObject won't necessarily
    // return a RenderEmbeddedObject, RenderPart or even RenderWidget.
    if (useFallbackContent())
        return RenderObject::createObject(this, style);

    if (isImageType()) {
        RenderImage* image = new (arena) RenderImage(this);
        image->setImageResource(RenderImageResource::create());
        return image;
    }

    return new (arena) RenderEmbeddedObject(this);
}

static void appendServerMapMousePosition(StringBuilder& url, Event* event)
{
    if (!event->isMouseEvent())
        return;

    ASSERT(event->target());
    Node* target = event->target()->toNode();
    ASSERT(target);
    if (!isHTMLImageElement(*target))
        return;

    HTMLImageElement& imageElement = toHTMLImageElement(*target);
    if (!imageElement.isServerMap())
        return;

    if (!imageElement.renderer() || !imageElement.renderer()->isRenderImage())
        return;
    RenderImage* renderer = toRenderImage(imageElement.renderer());

    // FIXME: This should probably pass true for useTransforms.
    FloatPoint absolutePosition = renderer->absoluteToLocal(FloatPoint(toMouseEvent(event)->pageX(), toMouseEvent(event)->pageY()));
    int x = absolutePosition.x();
    int y = absolutePosition.y();
    url.append('?');
    url.appendNumber(x);
    url.append(',');
    url.appendNumber(y);
}

void ImageInputType::altAttributeChanged()
{
    RenderImage* image = toRenderImage(element()->renderer());
    if (!image)
        return;
    image->updateAltText();
}

void Pasteboard::writeImage(Node* node, const KURL&, const String& title)
{
    ASSERT(node);
    ASSERT(node->renderer());
    ASSERT(node->renderer()->isImage());
    RenderImage* renderer = toRenderImage(node->renderer());
    CachedImage* cachedImage = renderer->cachedImage();
    ASSERT(cachedImage);
    Image* image = cachedImage->image();
    ASSERT(image);

    // If the image is wrapped in a link, |url| points to the target of the
    // link.  This isn't useful to us, so get the actual image URL.
    AtomicString urlString;
    if (node->hasTagName(HTMLNames::imgTag) || node->hasTagName(HTMLNames::inputTag))
        urlString = static_cast<Element*>(node)->getAttribute(HTMLNames::srcAttr);
#if ENABLE(SVG)
    else if (node->hasTagName(SVGNames::imageTag))
        urlString = static_cast<Element*>(node)->getAttribute(XLinkNames::hrefAttr);
#endif
    else if (node->hasTagName(HTMLNames::embedTag) || node->hasTagName(HTMLNames::objectTag)) {
        Element* element = static_cast<Element*>(node);
        urlString = element->getAttribute(element->imageSourceAttributeName());
    }
    KURL url = urlString.isEmpty() ? KURL() : node->document()->completeURL(deprecatedParseURL(urlString));

    NativeImageSkia* bitmap = 0;
#if !PLATFORM(CG)
    bitmap = image->nativeImageForCurrentFrame();
#endif
    ChromiumBridge::clipboardWriteImage(bitmap, url, title);
}

void Pasteboard::writeImage(Node* node, const KURL&, const String&)
{
    ASSERT(node && node->renderer() && node->renderer()->isImage());
    RenderImage* renderer = static_cast<RenderImage*>(node->renderer());
    CachedImage* cachedImage = static_cast<CachedImage*>(renderer->cachedImage());
    ASSERT(cachedImage);
    Image* image = cachedImage->image();
    ASSERT(image);

    clear();

    RefPtr<SharedBitmap> sourceBmp = image->nativeImageForCurrentFrame();
    if (!sourceBmp)
        return;

    IntRect rect(0, 0, sourceBmp->width(), sourceBmp->height());
    BitmapInfo bmpInfo;
    void* pixels;
    HBITMAP resultBitmap = sourceBmp->clipBitmap(rect, true, bmpInfo, pixels);
    if (!resultBitmap)
        return;

    if (::OpenClipboard(m_owner)) {
        ::SetClipboardData(CF_BITMAP, resultBitmap);
        ::CloseClipboard();
    } else
        DeleteObject(resultBitmap);
}

void Pasteboard::writeImage(Node* node, const KURL&, const String& title)
{
    ASSERT(node);

    if (!(node->renderer() && node->renderer()->isImage()))
        return;

    RenderImage* renderer = toRenderImage(node->renderer());
    CachedImage* cachedImage = renderer->cachedImage();
    if (!cachedImage || cachedImage->errorOccurred())
        return;
    Image* image = cachedImage->imageForRenderer(renderer);
    ASSERT(image);

    NativeImagePtr bitmap = image->nativeImageForCurrentFrame();
    if (!bitmap)
        return;

    // If the image is wrapped in a link, |url| points to the target of the
    // link.  This isn't useful to us, so get the actual image URL.
    AtomicString urlString;
    if (node->hasTagName(HTMLNames::imgTag) || node->hasTagName(HTMLNames::inputTag))
        urlString = static_cast<Element*>(node)->getAttribute(HTMLNames::srcAttr);
#if ENABLE(SVG)
    else if (node->hasTagName(SVGNames::imageTag))
        urlString = static_cast<Element*>(node)->getAttribute(XLinkNames::hrefAttr);
#endif
    else if (node->hasTagName(HTMLNames::embedTag) || node->hasTagName(HTMLNames::objectTag)) {
        Element* element = static_cast<Element*>(node);
        urlString = element->getAttribute(element->imageSourceAttributeName());
    }
    KURL url = urlString.isEmpty() ? KURL() : node->document()->completeURL(stripLeadingAndTrailingHTMLSpaces(urlString));

    PlatformSupport::clipboardWriteImage(bitmap, url, title);
}

void Pasteboard::writeImage(Node* node, const KURL&, const String& title)
{
    ASSERT(node);

    if (!(node->renderer() && node->renderer()->isImage()))
        return;

    RenderImage* renderer = toRenderImage(node->renderer());
    CachedImage* cachedImage = renderer->cachedImage();
    if (!cachedImage || cachedImage->errorOccurred())
        return;
    Image* image = cachedImage->imageForRenderer(renderer);
    ASSERT(image);

    GtkClipboard* clipboard = gtk_clipboard_get_for_display(gdk_display_get_default(), GDK_SELECTION_CLIPBOARD);
    DataObjectGtk* dataObject = DataObjectGtk::forClipboard(clipboard);

    KURL url = getURLForImageNode(node);
    if (!url.isEmpty()) {
        dataObject->setURL(url, title);

        dataObject->setMarkup(createMarkup(static_cast<Element*>(node), IncludeNode, 0, ResolveAllURLs));
    }

    GRefPtr<GdkPixbuf> pixbuf = adoptGRef(image->getGdkPixbuf());
    dataObject->setImage(pixbuf.get());

    PasteboardHelper::defaultPasteboardHelper()->writeClipboardContents(clipboard);
}

static void appendServerMapMousePosition(String& url, Event* event)
{
    if (!event->isMouseEvent())
        return;

    ASSERT(event->target());
    Node* target = event->target()->toNode();
    ASSERT(target);
    if (!target->hasTagName(imgTag))
        return;

    HTMLImageElement* imageElement = static_cast<HTMLImageElement*>(event->target()->toNode());
    if (!imageElement || !imageElement->isServerMap())
        return;

    RenderImage* renderer = toRenderImage(imageElement->renderer());
    if (!renderer)
        return;

    // FIXME: This should probably pass true for useTransforms.
    FloatPoint absolutePosition = renderer->absoluteToLocal(FloatPoint(static_cast<MouseEvent*>(event)->pageX(), static_cast<MouseEvent*>(event)->pageY()));
    int x = absolutePosition.x();
    int y = absolutePosition.y();
    url += "?";
    url += String::number(x);
    url += ",";
    url += String::number(y);
}

void HTMLObjectElement::attach()
{
    HTMLPlugInElement::attach();

    if (renderer() && !m_useFallbackContent) {
        if (isImageType()) {
            if (!m_imageLoader)
                m_imageLoader = new HTMLImageLoader(this);
            m_imageLoader->updateFromElement();
            if (renderer()) {
                RenderImage* imageObj = static_cast<RenderImage*>(renderer());
                imageObj->setCachedImage(m_imageLoader->image());
            }
        } else {
            if (m_needWidgetUpdate) {
                // Set m_needWidgetUpdate to false before calling updateWidget because updateWidget may cause
                // this method or recalcStyle (which also calls updateWidget) to be called.
                m_needWidgetUpdate = false;
                static_cast<RenderPartObject*>(renderer())->updateWidget(true);
            } else {
                m_needWidgetUpdate = true;
                setChanged();
            }
        }
    }
}

static CachedImage* getCachedImage(Element* element)
{
    ASSERT(element);
    RenderObject* renderer = element->renderer();
    if (!renderer || !renderer->isImage()) 
        return 0;
    RenderImage* image = static_cast<RenderImage*>(renderer);
    return image->cachedImage();
}

RenderObject* ImageContentData::createRenderer(Document& doc, RenderStyle* pseudoStyle) const
{
    RenderImage* image = RenderImage::createAnonymous(&doc);
    image->setPseudoStyle(pseudoStyle);
    if (m_image)
        image->setImageResource(RenderImageResourceStyleImage::create(m_image.get()));
    else
        image->setImageResource(RenderImageResource::create());
    return image;
}

RenderObject* HTMLImageElement::createRenderer(RenderStyle* style)
{
    if (style->hasContent())
        return RenderObject::createObject(this, style);

    RenderImage* image = new RenderImage(this);
    image->setImageResource(RenderImageResource::create());
    image->setImageDevicePixelRatio(m_imageDevicePixelRatio);
    return image;
}

RenderObject* ImageContentData::createRenderer(Document& document, RenderStyle& pseudoStyle) const
{
    // FIXME: We should find a way to avoid setting the style twice here.
    RenderImage* image = new RenderImage(document, pseudoStyle);
    image->setPseudoStyle(&pseudoStyle);
    if (m_image)
        image->setImageResource(RenderImageResourceStyleImage::create(*m_image));
    else
        image->setImageResource(RenderImageResource::create());
    return image;
}

static Image* getImage(Element* element)
{
    ASSERT(element);
    RenderObject* renderer = element->renderer();
    if (!renderer || !renderer->isImage())
        return 0;

    RenderImage* image = toRenderImage(renderer);
    if (image->cachedImage() && !image->cachedImage()->errorOccurred())
        return image->cachedImage()->image();
    return 0;
}