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C++ ImageCandidate类代码示例

本文整理汇总了C++中ImageCandidate类的典型用法代码示例。如果您正苦于以下问题：C++ ImageCandidate类的具体用法？C++ ImageCandidate怎么用？C++ ImageCandidate使用的例子？那么, 这里精选的类代码示例或许可以为您提供帮助。


在下文中一共展示了ImageCandidate类的15个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。

示例1: findBestFitImageFromPictureParent

void HTMLImageElement::selectSourceURL(ImageLoader::UpdateFromElementBehavior behavior)
{
    if (!document().isActive())
        return;

    bool foundURL = false;
    if (RuntimeEnabledFeatures::pictureEnabled()) {
        ImageCandidate candidate = findBestFitImageFromPictureParent();
        if (!candidate.isEmpty()) {
            setBestFitURLAndDPRFromImageCandidate(candidate);
            foundURL = true;
        }
    }

    if (!foundURL) {
        float effectiveSize = 0;
        if (RuntimeEnabledFeatures::pictureSizesEnabled()) {
            String sizes = fastGetAttribute(sizesAttr);
            if (!sizes.isNull())
                UseCounter::count(document(), UseCounter::Sizes);
            SizesAttributeParser parser = SizesAttributeParser(MediaValuesDynamic::create(document()), sizes);
            effectiveSize = parser.length();
        }
        ImageCandidate candidate = bestFitSourceForImageAttributes(document().devicePixelRatio(), effectiveSize, fastGetAttribute(srcAttr), fastGetAttribute(srcsetAttr), &document());
        setBestFitURLAndDPRFromImageCandidate(candidate);
    }
    if (m_intrinsicSizingViewportDependant && !m_listener) {
        m_listener = ViewportChangeListener::create(this);
        document().mediaQueryMatcher().addViewportListener(m_listener);
    }
    imageLoader().updateFromElement(behavior);
}
开发者ID:RobinWuDev，项目名称:Qt，代码行数:32，代码来源:HTMLImageElement.cpp

示例2: findBestFitImageFromPictureParent

void HTMLImageElement::selectSourceURL(ImageLoader::UpdateFromElementBehavior behavior)
{
    if (!document().isActive())
        return;

    bool foundURL = false;
    ImageCandidate candidate = findBestFitImageFromPictureParent();
    if (!candidate.isEmpty()) {
        setBestFitURLAndDPRFromImageCandidate(candidate);
        foundURL = true;
    }

    if (!foundURL) {
        candidate = bestFitSourceForImageAttributes(document().devicePixelRatio(), sourceSize(*this), fastGetAttribute(srcAttr), fastGetAttribute(srcsetAttr), &document());
        setBestFitURLAndDPRFromImageCandidate(candidate);
    }
    if (m_intrinsicSizingViewportDependant && !m_listener) {
        m_listener = ViewportChangeListener::create(this);
        document().mediaQueryMatcher().addViewportListener(m_listener);
    }
    imageLoader().updateFromElement(behavior, m_referrerPolicy);

    if (imageLoader().image() || (imageLoader().hasPendingActivity() && !imageSourceURL().isEmpty()))
        ensurePrimaryContent();
    else
        ensureFallbackContent();
}
开发者ID:dstockwell，项目名称:blink，代码行数:27，代码来源:HTMLImageElement.cpp

示例3: ASSERT

// http://picture.responsiveimages.org/#update-source-set
ImageCandidate HTMLImageElement::findBestFitImageFromPictureParent()
{
    ASSERT(isMainThread());
    Node* parent = parentNode();
    if (!parent || !isHTMLPictureElement(*parent))
        return ImageCandidate();
    for (Node* child = parent->firstChild(); child; child = child->nextSibling()) {
        if (child == this)
            return ImageCandidate();

        if (!isHTMLSourceElement(*child))
            continue;

        HTMLSourceElement* source = toHTMLSourceElement(child);
        if (!source->fastGetAttribute(srcAttr).isNull())
            UseCounter::countDeprecation(document(), UseCounter::PictureSourceSrc);
        String srcset = source->fastGetAttribute(srcsetAttr);
        if (srcset.isEmpty())
            continue;
        String type = source->fastGetAttribute(typeAttr);
        if (!type.isEmpty() && !supportedImageType(type))
            continue;

        if (!source->mediaQueryMatches())
            continue;

        ImageCandidate candidate = bestFitSourceForSrcsetAttribute(document().devicePixelRatio(), sourceSize(*source), source->fastGetAttribute(srcsetAttr), &document());
        if (candidate.isEmpty())
            continue;
        return candidate;
    }
    return ImageCandidate();
}
开发者ID:dstockwell，项目名称:blink，代码行数:34，代码来源:HTMLImageElement.cpp

示例4: processAttributes

    void processAttributes(const HTMLToken::AttributeList& attributes, Document& document, Vector<bool>& pictureState)
    {
        ASSERT(isMainThread());
        if (m_tagId >= TagId::Unknown)
            return;
        
        for (auto& attribute : attributes) {
            AtomicString attributeName(attribute.name);
            String attributeValue = StringImpl::create8BitIfPossible(attribute.value);
            processAttribute(attributeName, attributeValue, document, pictureState);
        }
        
        if (m_tagId == TagId::Source && !pictureState.isEmpty() && !pictureState.last() && m_mediaMatched && !m_srcSetAttribute.isEmpty()) {
            float sourceSize = parseSizesAttribute(m_sizesAttribute, document.renderView(), document.frame());
            ImageCandidate imageCandidate = bestFitSourceForImageAttributes(m_deviceScaleFactor, m_urlToLoad, m_srcSetAttribute, sourceSize);
            if (!imageCandidate.isEmpty()) {
                pictureState.last() = true;
                setUrlToLoad(imageCandidate.string.toString(), true);
            }
        }
        
        // Resolve between src and srcSet if we have them and the tag is img.
        if (m_tagId == TagId::Img && !m_srcSetAttribute.isEmpty()) {
            float sourceSize = parseSizesAttribute(m_sizesAttribute, document.renderView(), document.frame());
            ImageCandidate imageCandidate = bestFitSourceForImageAttributes(m_deviceScaleFactor, m_urlToLoad, m_srcSetAttribute, sourceSize);
            setUrlToLoad(imageCandidate.string.toString(), true);
        }

        if (m_metaIsViewport && !m_metaContent.isNull())
            document.processViewport(m_metaContent, ViewportArguments::ViewportMeta);
    }
开发者ID:emutavchi，项目名称:WebKitForWayland，代码行数:31，代码来源:HTMLPreloadScanner.cpp

示例5: TEST

TEST(ImageCandidateTest, Basic)
{
    ImageCandidate candidate;
    ASSERT_EQ(candidate.density(), 1);
    ASSERT_EQ(candidate.getResourceWidth(), -1);
    ASSERT_EQ(candidate.srcOrigin(), false);

}
开发者ID:aobzhirov，项目名称:ChromiumGStreamerBackend，代码行数:8，代码来源:HTMLSrcsetParserTest.cpp

示例6: setBestFitURLAndDPRFromImageCandidate

void HTMLImageElement::setBestFitURLAndDPRFromImageCandidate(const ImageCandidate& candidate)
{
    m_bestFitImageURL = candidate.url();
    float candidateDensity = candidate.density();
    if (candidateDensity >= 0)
        m_imageDevicePixelRatio = 1.0 / candidateDensity;
    if (renderer() && renderer()->isImage())
        toRenderImage(renderer())->setImageDevicePixelRatio(m_imageDevicePixelRatio);
}
开发者ID:venkatarajasekhar，项目名称:Qt，代码行数:9，代码来源:HTMLImageElement.cpp

示例7: bestFitSourceFromPictureElement

void HTMLImageElement::selectImageSource()
{
    // First look for the best fit source from our <picture> parent if we have one.
    ImageCandidate candidate = bestFitSourceFromPictureElement();
    if (candidate.isEmpty()) {
        // If we don't have a <picture> or didn't find a source, then we use our own attributes.
        float sourceSize = parseSizesAttribute(fastGetAttribute(sizesAttr).string(), document().renderView(), document().frame());
        candidate = bestFitSourceForImageAttributes(document().deviceScaleFactor(), fastGetAttribute(srcAttr), fastGetAttribute(srcsetAttr), sourceSize);
    }
    setBestFitURLAndDPRFromImageCandidate(candidate);
    m_imageLoader.updateFromElementIgnoringPreviousError();
}
开发者ID:TigerWFH，项目名称:webkit，代码行数:12，代码来源:HTMLImageElement.cpp

示例8: setBestFitURLAndDPRFromImageCandidate

void HTMLImageElement::setBestFitURLAndDPRFromImageCandidate(const ImageCandidate& candidate)
{
    m_bestFitImageURL = candidate.url();
    float candidateDensity = candidate.density();
    if (candidateDensity >= 0)
        m_imageDevicePixelRatio = 1.0 / candidateDensity;
    if (candidate.resourceWidth() > 0) {
        m_intrinsicSizingViewportDependant = true;
        UseCounter::count(document(), UseCounter::SrcsetWDescriptor);
    } else if (!candidate.srcOrigin()) {
        UseCounter::count(document(), UseCounter::SrcsetXDescriptor);
    }
    if (layoutObject() && layoutObject()->isImage())
        toLayoutImage(layoutObject())->setImageDevicePixelRatio(m_imageDevicePixelRatio);
}
开发者ID:dstockwell，项目名称:blink，代码行数:15，代码来源:HTMLImageElement.cpp

示例9: resetFormOwner

Node::InsertionNotificationRequest HTMLImageElement::insertedInto(ContainerNode* insertionPoint)
{
    if (!m_formWasSetByParser || insertionPoint->highestAncestorOrSelf() != m_form->highestAncestorOrSelf())
        resetFormOwner();

    bool imageWasModified = false;
    if (RuntimeEnabledFeatures::pictureEnabled()) {
        ImageCandidate candidate = findBestFitImageFromPictureParent();
        if (!candidate.isEmpty()) {
            setBestFitURLAndDPRFromImageCandidate(candidate);
            imageWasModified = true;
        }
    }

    // If we have been inserted from a renderer-less document,
    // our loader may have not fetched the image, so do it now.
    if ((insertionPoint->inDocument() && !imageLoader().image()) || imageWasModified)
        imageLoader().updateFromElement(m_elementCreatedByParser ? ImageLoader::ForceLoadImmediately : ImageLoader::LoadNormally);

    return HTMLElement::insertedInto(insertionPoint);
}
开发者ID:venkatarajasekhar，项目名称:Qt，代码行数:21，代码来源:HTMLImageElement.cpp

示例10: bestFitSourceForImageAttributes

String bestFitSourceForImageAttributes(float deviceScaleFactor, unsigned sourceSize, const String& srcAttribute, ImageCandidate& srcsetImageCandidate)
{
    if (srcsetImageCandidate.isEmpty())
        return srcAttribute;

    Vector<ImageCandidate> imageCandidates;
    imageCandidates.append(srcsetImageCandidate);

    if (!srcAttribute.isEmpty())
        imageCandidates.append(ImageCandidate(srcAttribute, 0, srcAttribute.length(), DescriptorParsingResult(), ImageCandidate::SrcOrigin));

    return pickBestImageCandidate(deviceScaleFactor, sourceSize, imageCandidates).toString();
}
开发者ID:335969568，项目名称:Blink-1，代码行数:13，代码来源:HTMLSrcsetParser.cpp

示例11: parentNode

ImageCandidate HTMLImageElement::bestFitSourceFromPictureElement()
{
    auto* parent = parentNode();
    if (!is<HTMLPictureElement>(parent))
        return { };
    auto* picture = downcast<HTMLPictureElement>(parent);
    picture->clearViewportDependentResults();
    document().removeViewportDependentPicture(*picture);
    for (Node* child = parent->firstChild(); child && child != this; child = child->nextSibling()) {
        if (!is<HTMLSourceElement>(*child))
            continue;
        auto& source = downcast<HTMLSourceElement>(*child);
        auto& srcset = source.fastGetAttribute(srcsetAttr);
        if (srcset.isEmpty())
            continue;
        if (source.hasAttribute(typeAttr)) {
            String type = source.fastGetAttribute(typeAttr).string();
            int indexOfSemicolon = type.find(';');
            if (indexOfSemicolon >= 0)
                type.truncate(indexOfSemicolon);
            type = stripLeadingAndTrailingHTMLSpaces(type);
            type = type.lower();
            if (!type.isEmpty() && !MIMETypeRegistry::isSupportedImageMIMEType(type) && type != "image/svg+xml")
                continue;
        }
        MediaQueryEvaluator evaluator(document().printing() ? "print" : "screen", document().frame(), computedStyle());
        bool evaluation = evaluator.evalCheckingViewportDependentResults(source.mediaQuerySet(), picture->viewportDependentResults());
        if (picture->hasViewportDependentResults())
            document().addViewportDependentPicture(*picture);
        if (!evaluation)
            continue;

        float sourceSize = parseSizesAttribute(source.fastGetAttribute(sizesAttr).string(), document().renderView(), document().frame());
        ImageCandidate candidate = bestFitSourceForImageAttributes(document().deviceScaleFactor(), nullAtom, source.fastGetAttribute(srcsetAttr), sourceSize);
        if (!candidate.isEmpty())
            return candidate;
    }
    return { };
}
开发者ID:valbok，项目名称:WebKitForWayland，代码行数:39，代码来源:HTMLImageElement.cpp

示例12: resetFormOwner

Node::InsertionNotificationRequest HTMLImageElement::insertedInto(ContainerNode* insertionPoint)
{
    if (!m_formWasSetByParser || NodeTraversal::highestAncestorOrSelf(*insertionPoint) != NodeTraversal::highestAncestorOrSelf(*m_form.get()))
        resetFormOwner();
    if (m_listener)
        document().mediaQueryMatcher().addViewportListener(m_listener);

    bool imageWasModified = false;
    if (document().isActive()) {
        ImageCandidate candidate = findBestFitImageFromPictureParent();
        if (!candidate.isEmpty()) {
            setBestFitURLAndDPRFromImageCandidate(candidate);
            imageWasModified = true;
        }
    }

    // If we have been inserted from a layoutObject-less document,
    // our loader may have not fetched the image, so do it now.
    if ((insertionPoint->inDocument() && !imageLoader().image()) || imageWasModified)
        imageLoader().updateFromElement(ImageLoader::UpdateNormal, m_referrerPolicy);

    return HTMLElement::insertedInto(insertionPoint);
}
开发者ID:dstockwell，项目名称:blink，代码行数:23，代码来源:HTMLImageElement.cpp

示例13: findBestFitImageFromPictureParent

void HTMLImageElement::selectSourceURL(UpdateFromElementBehavior behavior)
{
    bool foundURL = false;
    if (RuntimeEnabledFeatures::pictureEnabled()) {
        ImageCandidate candidate = findBestFitImageFromPictureParent();
        if (!candidate.isEmpty()) {
            setBestFitURLAndDPRFromImageCandidate(candidate);
            foundURL = true;
        }
    }

    if (!foundURL) {
        unsigned effectiveSize = 0;
        if (RuntimeEnabledFeatures::pictureSizesEnabled())
            effectiveSize = SizesAttributeParser::findEffectiveSize(fastGetAttribute(sizesAttr), MediaValuesCached::create(document()));
        ImageCandidate candidate = bestFitSourceForImageAttributes(document().devicePixelRatio(), effectiveSize, fastGetAttribute(srcAttr), fastGetAttribute(srcsetAttr));
        setBestFitURLAndDPRFromImageCandidate(candidate);
    }
    if (behavior == UpdateIgnorePreviousError)
        imageLoader().updateFromElementIgnoringPreviousError();
    else
        imageLoader().updateFromElement();
}
开发者ID:venkatarajasekhar，项目名称:Qt，代码行数:23，代码来源:HTMLImageElement.cpp

示例14: ASSERT

// http://picture.responsiveimages.org/#update-source-set
ImageCandidate HTMLImageElement::findBestFitImageFromPictureParent()
{
    ASSERT(isMainThread());
    Node* parent = parentNode();
    if (!parent || !isHTMLPictureElement(*parent))
        return ImageCandidate();
    for (Node* child = parent->firstChild(); child; child = child->nextSibling()) {
        if (child == this)
            return ImageCandidate();

        if (!isHTMLSourceElement(*child))
            continue;

        HTMLSourceElement* source = toHTMLSourceElement(child);
        String srcset = source->fastGetAttribute(srcsetAttr);
        if (srcset.isEmpty())
            continue;
        String type = source->fastGetAttribute(typeAttr);
        if (!type.isEmpty() && !supportedImageType(type))
            continue;

        String media = source->fastGetAttribute(mediaAttr);
        if (!media.isEmpty()) {
            RefPtrWillBeRawPtr<MediaQuerySet> mediaQueries = MediaQuerySet::create(media);
            if (!document().mediaQueryMatcher().evaluate(mediaQueries.get()))
                continue;
        }

        unsigned effectiveSize = SizesAttributeParser::findEffectiveSize(source->fastGetAttribute(sizesAttr), MediaValuesCached::create(document()));
        ImageCandidate candidate = bestFitSourceForSrcsetAttribute(document().devicePixelRatio(), effectiveSize, source->fastGetAttribute(srcsetAttr));
        if (candidate.isEmpty())
            continue;
        return candidate;
    }
    return ImageCandidate();
}
开发者ID:venkatarajasekhar，项目名称:Qt，代码行数:37，代码来源:HTMLImageElement.cpp

示例15: compareByDensity

static bool compareByDensity(const ImageCandidate& first, const ImageCandidate& second)
{
    return first.density() < second.density();
}
开发者ID:335969568，项目名称:Blink-1，代码行数:4，代码来源:HTMLSrcsetParser.cpp


注：本文中的ImageCandidate类示例由纯净天空整理自Github/MSDocs等开源代码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。