C++ RenderObject::document方法代码示例

LayoutRect AccessibilityListBoxOption::elementRect() const
{
    LayoutRect rect;
    if (!m_optionElement)
        return rect;
    
    HTMLSelectElement* listBoxParentNode = listBoxOptionParentNode();
    if (!listBoxParentNode)
        return rect;
    
    RenderObject* listBoxRenderer = listBoxParentNode->renderer();
    if (!listBoxRenderer)
        return rect;
    
    LayoutRect parentRect = listBoxRenderer->document()->axObjectCache()->getOrCreate(listBoxRenderer)->elementRect();
    int index = listBoxOptionIndex();
    if (index != -1)
        rect = toRenderListBox(listBoxRenderer)->itemBoundingBoxRect(parentRect.location(), index);
    
    return rect;
}

void RenderSVGInlineText::computeNewScaledFontForStyle(const RenderObject& renderer, const RenderStyle& style, float& scalingFactor, FontCascade& scaledFont)
{
    // Alter font-size to the right on-screen value to avoid scaling the glyphs themselves, except when GeometricPrecision is specified
    scalingFactor = SVGRenderingContext::calculateScreenFontSizeScalingFactor(renderer);
    if (!scalingFactor || style.fontDescription().textRenderingMode() == GeometricPrecision) {
        scalingFactor = 1;
        scaledFont = style.fontCascade();
        return;
    }

    auto fontDescription = style.fontDescription();

    // FIXME: We need to better handle the case when we compute very small fonts below (below 1pt).
    fontDescription.setComputedSize(Style::computedFontSizeFromSpecifiedSizeForSVGInlineText(fontDescription.computedSize(), fontDescription.isAbsoluteSize(), scalingFactor, renderer.document()));

    // SVG controls its own glyph orientation, so don't allow writing-mode
    // to affect it.
    if (fontDescription.orientation() != FontOrientation::Horizontal)
        fontDescription.setOrientation(FontOrientation::Horizontal);

    scaledFont = FontCascade(fontDescription, 0, 0);
    scaledFont.update(&renderer.document().fontSelector());
}

VisiblePosition AXObjectCache::visiblePositionForTextMarkerData(TextMarkerData& textMarkerData)
{
    if (!isNodeInUse(textMarkerData.node))
        return VisiblePosition();
    
    // FIXME: Accessability should make it clear these are DOM-compliant offsets or store Position objects.
    VisiblePosition visiblePos = VisiblePosition(createLegacyEditingPosition(textMarkerData.node, textMarkerData.offset), textMarkerData.affinity);
    Position deepPos = visiblePos.deepEquivalent();
    if (deepPos.isNull())
        return VisiblePosition();
    
    RenderObject* renderer = deepPos.deprecatedNode()->renderer();
    if (!renderer)
        return VisiblePosition();
    
    AXObjectCache* cache = renderer->document()->axObjectCache();
    if (!cache->isIDinUse(textMarkerData.axID))
        return VisiblePosition();
    
    if (deepPos.deprecatedNode() != textMarkerData.node || deepPos.deprecatedEditingOffset() != textMarkerData.offset)
        return VisiblePosition();
    
    return visiblePos;
}

void AXObjectCache::textMarkerDataForVisiblePosition(TextMarkerData& textMarkerData, const VisiblePosition& visiblePos)
{
    // This memory must be bzero'd so instances of TextMarkerData can be tested for byte-equivalence.
    // This also allows callers to check for failure by looking at textMarkerData upon return.
    memset(&textMarkerData, 0, sizeof(TextMarkerData));
    
    if (visiblePos.isNull())
        return;
    
    Position deepPos = visiblePos.deepEquivalent();
    Node* domNode = deepPos.deprecatedNode();
    ASSERT(domNode);
    if (!domNode)
        return;
    
    if (domNode->isHTMLElement()) {
        HTMLInputElement* inputElement = domNode->toInputElement();
        if (inputElement && inputElement->isPasswordField())
            return;
    }
    
    // locate the renderer, which must exist for a visible dom node
    RenderObject* renderer = domNode->renderer();
    ASSERT(renderer);
    
    // find or create an accessibility object for this renderer
    AXObjectCache* cache = renderer->document()->axObjectCache();
    RefPtr<AccessibilityObject> obj = cache->getOrCreate(renderer);
    
    textMarkerData.axID = obj.get()->axObjectID();
    textMarkerData.node = domNode;
    textMarkerData.offset = deepPos.deprecatedEditingOffset();
    textMarkerData.affinity = visiblePos.affinity();   
    
    cache->setNodeInUse(domNode);
}

int RootInlineBox::verticallyAlignBoxes(int heightOfBlock, GlyphOverflowAndFallbackFontsMap& textBoxDataMap)
{
#if ENABLE(SVG)
    // SVG will handle vertical alignment on its own.
    if (isSVGRootInlineBox())
        return 0;
#endif

    int maxPositionTop = 0;
    int maxPositionBottom = 0;
    int maxAscent = 0;
    int maxDescent = 0;

    // Figure out if we're in strict mode.  Note that we can't simply use !style()->htmlHacks(),
    // because that would match almost strict mode as well.
    RenderObject* curr = renderer();
    while (curr && !curr->node())
        curr = curr->container();
    bool strictMode = (curr && curr->document()->inStrictMode());

    computeLogicalBoxHeights(maxPositionTop, maxPositionBottom, maxAscent, maxDescent, strictMode, textBoxDataMap);

    if (maxAscent + maxDescent < max(maxPositionTop, maxPositionBottom))
        adjustMaxAscentAndDescent(maxAscent, maxDescent, maxPositionTop, maxPositionBottom);

    int maxHeight = maxAscent + maxDescent;
    int lineTop = heightOfBlock;
    int lineBottom = heightOfBlock;
    placeBoxesVertically(heightOfBlock, maxHeight, maxAscent, strictMode, lineTop, lineBottom);
    computeVerticalOverflow(lineTop, lineBottom, strictMode, textBoxDataMap);
    setLineTopBottomPositions(lineTop, lineBottom);
    
    heightOfBlock += maxHeight;
    
    return heightOfBlock;
}

void SVGInlineTextBox::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset, LayoutUnit, LayoutUnit)
{
    ASSERT(paintInfo.shouldPaintWithinRoot(renderer()));
    ASSERT(paintInfo.phase == PaintPhaseForeground || paintInfo.phase == PaintPhaseSelection);
    ASSERT(truncation() == cNoTruncation);

    if (renderer()->style()->visibility() != VISIBLE)
        return;

    // Note: We're explicitely not supporting composition & custom underlines and custom highlighters - unlike InlineTextBox.
    // If we ever need that for SVG, it's very easy to refactor and reuse the code.

    RenderObject* parentRenderer = parent()->renderer();
    ASSERT(parentRenderer);

    bool paintSelectedTextOnly = paintInfo.phase == PaintPhaseSelection;
    bool hasSelection = !parentRenderer->document().printing() && selectionState() != RenderObject::SelectionNone;
    if (!hasSelection && paintSelectedTextOnly)
        return;

    RenderSVGInlineText* textRenderer = toRenderSVGInlineText(this->textRenderer());
    ASSERT(textRenderer);
    if (!textShouldBePainted(textRenderer))
        return;

    RenderStyle* style = parentRenderer->style();
    ASSERT(style);

    paintDocumentMarkers(paintInfo.context, paintOffset, style, textRenderer->scaledFont(), true);

    const SVGRenderStyle* svgStyle = style->svgStyle();
    ASSERT(svgStyle);

    bool hasFill = svgStyle->hasFill();
    bool hasVisibleStroke = svgStyle->hasVisibleStroke();

    RenderStyle* selectionStyle = style;
    if (hasSelection) {
        selectionStyle = parentRenderer->getCachedPseudoStyle(SELECTION);
        if (selectionStyle) {
            const SVGRenderStyle* svgSelectionStyle = selectionStyle->svgStyle();
            ASSERT(svgSelectionStyle);

            if (!hasFill)
                hasFill = svgSelectionStyle->hasFill();
            if (!hasVisibleStroke)
                hasVisibleStroke = svgSelectionStyle->hasVisibleStroke();
        } else
            selectionStyle = style;
    }

    if (textRenderer->frame() && textRenderer->frame()->view() && textRenderer->frame()->view()->paintBehavior() & PaintBehaviorRenderingSVGMask) {
        hasFill = true;
        hasVisibleStroke = false;
    }

    AffineTransform fragmentTransform;
    unsigned textFragmentsSize = m_textFragments.size();
    for (unsigned i = 0; i < textFragmentsSize; ++i) {
        SVGTextFragment& fragment = m_textFragments.at(i);
        ASSERT(!m_paintingResource);

        GraphicsContextStateSaver stateSaver(*paintInfo.context, false);
        fragment.buildFragmentTransform(fragmentTransform);
        if (!fragmentTransform.isIdentity()) {
            stateSaver.save();
            paintInfo.context->concatCTM(fragmentTransform);
        }

        // Spec: All text decorations except line-through should be drawn before the text is filled and stroked; thus, the text is rendered on top of these decorations.
        unsigned decorations = style->textDecorationsInEffect();
        if (decorations & TextDecorationUnderline)
            paintDecoration(paintInfo.context, TextDecorationUnderline, fragment);
        if (decorations & TextDecorationOverline)
            paintDecoration(paintInfo.context, TextDecorationOverline, fragment);

        for (int i = 0; i < 3; i++) {
            switch (svgStyle->paintOrderType(i)) {
            case PT_FILL:
                // Fill text
                if (hasFill) {
                    m_paintingResourceMode = ApplyToFillMode | ApplyToTextMode;
                    paintText(paintInfo.context, style, selectionStyle, fragment, hasSelection, paintSelectedTextOnly);
                }
                break;
            case PT_STROKE:
                // Stroke text
                if (hasVisibleStroke) {
                    m_paintingResourceMode = ApplyToStrokeMode | ApplyToTextMode;
                    paintText(paintInfo.context, style, selectionStyle, fragment, hasSelection, paintSelectedTextOnly);
                }
                break;
            case PT_MARKERS:
                // Markers don't apply to text
                break;
            default:
                ASSERT_NOT_REACHED();
                break;
            }
        }
//.........这里部分代码省略.........

void SVGInlineTextBox::paintSelectionBackground(PaintInfo& paintInfo)
{
    ASSERT(paintInfo.shouldPaintWithinRoot(renderer()));
    ASSERT(paintInfo.phase == PaintPhaseForeground || paintInfo.phase == PaintPhaseSelection);
    ASSERT(truncation() == cNoTruncation);

    if (renderer()->style()->visibility() != VISIBLE)
        return;

    RenderObject* parentRenderer = parent()->renderer();
    ASSERT(parentRenderer);
    ASSERT(!parentRenderer->document()->printing());

    // Determine whether or not we're selected.
    bool paintSelectedTextOnly = paintInfo.phase == PaintPhaseSelection;
    bool hasSelection = selectionState() != RenderObject::SelectionNone;
    if (!hasSelection || paintSelectedTextOnly)
        return;

    Color backgroundColor = renderer()->selectionBackgroundColor();
    if (!backgroundColor.isValid() || !backgroundColor.alpha())
        return;

    RenderSVGInlineText* textRenderer = toRenderSVGInlineText(this->textRenderer());
    ASSERT(textRenderer);
    if (!textShouldBePainted(textRenderer))
        return;

    RenderStyle* style = parentRenderer->style();
    ASSERT(style);

    RenderStyle* selectionStyle = style;
    if (hasSelection) {
        selectionStyle = parentRenderer->getCachedPseudoStyle(SELECTION);
        if (!selectionStyle)
            selectionStyle = style;
    }

    int startPosition, endPosition;
    selectionStartEnd(startPosition, endPosition);

    int fragmentStartPosition = 0;
    int fragmentEndPosition = 0;
    AffineTransform fragmentTransform;
    unsigned textFragmentsSize = m_textFragments.size();
    for (unsigned i = 0; i < textFragmentsSize; ++i) {
        SVGTextFragment& fragment = m_textFragments.at(i);
        ASSERT(!m_paintingResource);

        fragmentStartPosition = startPosition;
        fragmentEndPosition = endPosition;
        if (!mapStartEndPositionsIntoFragmentCoordinates(fragment, fragmentStartPosition, fragmentEndPosition))
            continue;

        GraphicsContextStateSaver stateSaver(*paintInfo.context);
        fragment.buildFragmentTransform(fragmentTransform);
        if (!fragmentTransform.isIdentity())
            paintInfo.context->concatCTM(fragmentTransform);

        paintInfo.context->setFillColor(backgroundColor, style->colorSpace());
        paintInfo.context->fillRect(selectionRectForTextFragment(fragment, fragmentStartPosition, fragmentEndPosition, style), backgroundColor, style->colorSpace());

        m_paintingResourceMode = ApplyToDefaultMode;
    }

    ASSERT(!m_paintingResource);
}

void writeResources(TextStream& ts, const RenderObject& object, int indent)
{
    const RenderStyle* style = object.style();
    const SVGRenderStyle* svgStyle = style->svgStyle();

    // FIXME: We want to use SVGResourcesCache to determine which resources are present, instead of quering the resource <-> id cache.
    // For now leave the DRT output as is, but later on we should change this so cycles are properly ignored in the DRT output.
    RenderObject& renderer = const_cast<RenderObject&>(object);
    if (!svgStyle->maskerResource().isEmpty()) {
        if (RenderSVGResourceMasker* masker = getRenderSVGResourceById<RenderSVGResourceMasker>(object.document(), svgStyle->maskerResource())) {
            writeIndent(ts, indent);
            ts << " ";
            writeNameAndQuotedValue(ts, "masker", svgStyle->maskerResource());
            ts << " ";
            writeStandardPrefix(ts, *masker, 0);
            ts << " " << masker->resourceBoundingBox(&renderer) << "\n";
        }
    }
    if (!svgStyle->clipperResource().isEmpty()) {
        if (RenderSVGResourceClipper* clipper = getRenderSVGResourceById<RenderSVGResourceClipper>(object.document(), svgStyle->clipperResource())) {
            writeIndent(ts, indent);
            ts << " ";
            writeNameAndQuotedValue(ts, "clipPath", svgStyle->clipperResource());
            ts << " ";
            writeStandardPrefix(ts, *clipper, 0);
            ts << " " << clipper->resourceBoundingBox(&renderer) << "\n";
        }
    }
    if (!svgStyle->filterResource().isEmpty()) {
        if (RenderSVGResourceFilter* filter = getRenderSVGResourceById<RenderSVGResourceFilter>(object.document(), svgStyle->filterResource())) {
            writeIndent(ts, indent);
            ts << " ";
            writeNameAndQuotedValue(ts, "filter", svgStyle->filterResource());
            ts << " ";
            writeStandardPrefix(ts, *filter, 0);
            ts << " " << filter->resourceBoundingBox(&renderer) << "\n";
        }
    }
}

void SVGInlineTextBox::paint(PaintInfo& paintInfo, int, int)
{
    ASSERT(paintInfo.shouldPaintWithinRoot(renderer()));
    ASSERT(paintInfo.phase == PaintPhaseForeground || paintInfo.phase == PaintPhaseSelection);
    ASSERT(truncation() == cNoTruncation);

    if (renderer()->style()->visibility() != VISIBLE)
        return;

    // Note: We're explicitely not supporting composition & custom underlines and custom highlighters - unlike InlineTextBox.
    // If we ever need that for SVG, it's very easy to refactor and reuse the code.

    RenderObject* parentRenderer = parent()->renderer();
    ASSERT(parentRenderer);

    bool paintSelectedTextOnly = paintInfo.phase == PaintPhaseSelection;
    bool hasSelection = !parentRenderer->document()->printing() && selectionState() != RenderObject::SelectionNone;
    if (!hasSelection && paintSelectedTextOnly)
        return;

    RenderStyle* style = parentRenderer->style();
    ASSERT(style);

    const SVGRenderStyle* svgStyle = style->svgStyle();
    ASSERT(svgStyle);

    bool hasFill = svgStyle->hasFill();
    bool hasStroke = svgStyle->hasStroke();

    RenderStyle* selectionStyle = style;
    if (hasSelection) {
        selectionStyle = parentRenderer->getCachedPseudoStyle(SELECTION);
        if (selectionStyle) {
            const SVGRenderStyle* svgSelectionStyle = selectionStyle->svgStyle();
            ASSERT(svgSelectionStyle);

            if (!hasFill)
                hasFill = svgSelectionStyle->hasFill();
            if (!hasStroke)
                hasStroke = svgSelectionStyle->hasStroke();
        } else
            selectionStyle = style;
    }

    unsigned textFragmentsSize = m_textFragments.size();
    for (unsigned i = 0; i < textFragmentsSize; ++i) {
        SVGTextFragment& fragment = m_textFragments.at(i);
        ASSERT(!m_paintingResource);

        paintInfo.context->save();

        if (!fragment.transform.isIdentity())
            paintInfo.context->concatCTM(fragment.transform);

        // Spec: All text decorations except line-through should be drawn before the text is filled and stroked; thus, the text is rendered on top of these decorations.
        int decorations = style->textDecorationsInEffect();
        if (decorations & UNDERLINE)
            paintDecoration(paintInfo.context, UNDERLINE, fragment);
        if (decorations & OVERLINE)
            paintDecoration(paintInfo.context, OVERLINE, fragment);

        // Fill text
        if (hasFill) {
            m_paintingResourceMode = ApplyToFillMode | ApplyToTextMode;
            paintText(paintInfo.context, style, selectionStyle, fragment, hasSelection, paintSelectedTextOnly);
        }

        // Stroke text
        if (hasStroke) {
            m_paintingResourceMode = ApplyToStrokeMode | ApplyToTextMode;
            paintText(paintInfo.context, style, selectionStyle, fragment, hasSelection, paintSelectedTextOnly);
        }

        // Spec: Line-through should be drawn after the text is filled and stroked; thus, the line-through is rendered on top of the text.
        if (decorations & LINE_THROUGH)
            paintDecoration(paintInfo.context, LINE_THROUGH, fragment);

        m_paintingResourceMode = ApplyToDefaultMode;
        paintInfo.context->restore();
    }

    ASSERT(!m_paintingResource);
}

bool RenderTheme::paintDecorations(const RenderObject& renderer, const PaintInfo& paintInfo, const LayoutRect& rect)
{
    if (paintInfo.context->paintingDisabled())
        return false;

    IntRect integralSnappedRect = pixelSnappedIntRect(rect);
    FloatRect devicePixelSnappedRect = pixelSnappedForPainting(rect, renderer.document().deviceScaleFactor());

    // Call the appropriate paint method based off the appearance value.
    switch (renderer.style().appearance()) {
    case MenulistButtonPart:
        return paintMenuListButtonDecorations(renderer, paintInfo, integralSnappedRect);
    case TextFieldPart:
        return paintTextFieldDecorations(renderer, paintInfo, devicePixelSnappedRect);
    case TextAreaPart:
        return paintTextAreaDecorations(renderer, paintInfo, devicePixelSnappedRect);
    case CheckboxPart:
        return paintCheckboxDecorations(renderer, paintInfo, integralSnappedRect);
    case RadioPart:
        return paintRadioDecorations(renderer, paintInfo, integralSnappedRect);
    case PushButtonPart:
        return paintPushButtonDecorations(renderer, paintInfo, integralSnappedRect);
    case SquareButtonPart:
        return paintSquareButtonDecorations(renderer, paintInfo, integralSnappedRect);
    case ButtonPart:
        return paintButtonDecorations(renderer, paintInfo, integralSnappedRect);
    case MenulistPart:
        return paintMenuListDecorations(renderer, paintInfo, integralSnappedRect);
    case SliderThumbHorizontalPart:
    case SliderThumbVerticalPart:
        return paintSliderThumbDecorations(renderer, paintInfo, integralSnappedRect);
    case SearchFieldPart:
        return paintSearchFieldDecorations(renderer, paintInfo, integralSnappedRect);
#if ENABLE(METER_ELEMENT)
    case MeterPart:
    case RelevancyLevelIndicatorPart:
    case ContinuousCapacityLevelIndicatorPart:
    case DiscreteCapacityLevelIndicatorPart:
    case RatingLevelIndicatorPart:
#endif
#if ENABLE(PROGRESS_ELEMENT)
    case ProgressBarPart:
#endif
    case SliderHorizontalPart:
    case SliderVerticalPart:
    case ListboxPart:
    case DefaultButtonPart:
    case SearchFieldCancelButtonPart:
    case SearchFieldDecorationPart:
    case SearchFieldResultsDecorationPart:
    case SearchFieldResultsButtonPart:
#if ENABLE(INPUT_SPEECH)
    case InputSpeechButtonPart:
#endif
#if ENABLE(SERVICE_CONTROLS)
    case ImageControlsButtonPart:
#endif
    default:
        break;
    }

    return false;
}

void writeResources(TextStream& ts, const RenderObject& object, int indent)
{
    const RenderStyle* style = object.style();
    const SVGRenderStyle* svgStyle = style->svgStyle();

    RenderObject& renderer = const_cast<RenderObject&>(object);
    if (!svgStyle->maskerResource().isEmpty()) {
        if (RenderSVGResourceMasker* masker = getRenderSVGResourceById<RenderSVGResourceMasker>(object.document(), svgStyle->maskerResource())) {
            writeIndent(ts, indent);
            ts << " ";
            writeNameAndQuotedValue(ts, "masker", svgStyle->maskerResource());
            ts << " ";
            writeStandardPrefix(ts, *masker, 0);
            ts << " " << masker->resourceBoundingBox(&renderer) << "\n";
        }
    }
    if (!svgStyle->clipperResource().isEmpty()) {
        if (RenderSVGResourceClipper* clipper = getRenderSVGResourceById<RenderSVGResourceClipper>(object.document(), svgStyle->clipperResource())) {
            writeIndent(ts, indent);
            ts << " ";
            writeNameAndQuotedValue(ts, "clipPath", svgStyle->clipperResource());
            ts << " ";
            writeStandardPrefix(ts, *clipper, 0);
            ts << " " << clipper->resourceBoundingBox(&renderer) << "\n";
        }
    }
#if ENABLE(FILTERS)
    if (!svgStyle->filterResource().isEmpty()) {
        if (RenderSVGResourceFilter* filter = getRenderSVGResourceById<RenderSVGResourceFilter>(object.document(), svgStyle->filterResource())) {
            writeIndent(ts, indent);
            ts << " ";
            writeNameAndQuotedValue(ts, "filter", svgStyle->filterResource());
            ts << " ";
            writeStandardPrefix(ts, *filter, 0);
            ts << " " << filter->resourceBoundingBox(&renderer) << "\n";
        }
    }
#endif
}

bool RenderTheme::paint(const RenderObject& o, ControlStates* controlStates, const PaintInfo& paintInfo, const LayoutRect& r)
{
    // If painting is disabled, but we aren't updating control tints, then just bail.
    // If we are updating control tints, just schedule a repaint if the theme supports tinting
    // for that control.
    if (paintInfo.context->updatingControlTints()) {
        if (controlSupportsTints(o))
            o.repaint();
        return false;
    }
    if (paintInfo.context->paintingDisabled())
        return false;

    ControlPart part = o.style().appearance();
    IntRect integralSnappedRect = snappedIntRect(r);
    FloatRect devicePixelSnappedRect = snapRectToDevicePixels(r, o.document().deviceScaleFactor());

#if USE(NEW_THEME)
    switch (part) {
    case CheckboxPart:
    case RadioPart:
    case PushButtonPart:
    case SquareButtonPart:
    case DefaultButtonPart:
    case ButtonPart:
    case InnerSpinButtonPart:
        updateControlStatesForRenderer(o, controlStates);
        m_theme->paint(part, controlStates, const_cast<GraphicsContext*>(paintInfo.context), devicePixelSnappedRect, o.style().effectiveZoom(), &o.view().frameView());
        return false;
    default:
        break;
    }
#else
    UNUSED_PARAM(controlStates);
#endif

    // Call the appropriate paint method based off the appearance value.
    switch (part) {
#if !USE(NEW_THEME)
    case CheckboxPart:
        return paintCheckbox(o, paintInfo, integralSnappedRect);
    case RadioPart:
        return paintRadio(o, paintInfo, integralSnappedRect);
    case PushButtonPart:
    case SquareButtonPart:
    case DefaultButtonPart:
    case ButtonPart:
        return paintButton(o, paintInfo, integralSnappedRect);
    case InnerSpinButtonPart:
        return paintInnerSpinButton(o, paintInfo, integralSnappedRect);
#endif
    case MenulistPart:
        return paintMenuList(o, paintInfo, devicePixelSnappedRect);
#if ENABLE(METER_ELEMENT)
    case MeterPart:
    case RelevancyLevelIndicatorPart:
    case ContinuousCapacityLevelIndicatorPart:
    case DiscreteCapacityLevelIndicatorPart:
    case RatingLevelIndicatorPart:
        return paintMeter(o, paintInfo, integralSnappedRect);
#endif
    case ProgressBarPart:
        return paintProgressBar(o, paintInfo, integralSnappedRect);
    case SliderHorizontalPart:
    case SliderVerticalPart:
        return paintSliderTrack(o, paintInfo, integralSnappedRect);
    case SliderThumbHorizontalPart:
    case SliderThumbVerticalPart:
        return paintSliderThumb(o, paintInfo, integralSnappedRect);
    case MediaEnterFullscreenButtonPart:
    case MediaExitFullscreenButtonPart:
        return paintMediaFullscreenButton(o, paintInfo, integralSnappedRect);
    case MediaPlayButtonPart:
        return paintMediaPlayButton(o, paintInfo, integralSnappedRect);
    case MediaOverlayPlayButtonPart:
        return paintMediaOverlayPlayButton(o, paintInfo, integralSnappedRect);
    case MediaMuteButtonPart:
        return paintMediaMuteButton(o, paintInfo, integralSnappedRect);
    case MediaSeekBackButtonPart:
        return paintMediaSeekBackButton(o, paintInfo, integralSnappedRect);
    case MediaSeekForwardButtonPart:
        return paintMediaSeekForwardButton(o, paintInfo, integralSnappedRect);
    case MediaRewindButtonPart:
        return paintMediaRewindButton(o, paintInfo, integralSnappedRect);
    case MediaReturnToRealtimeButtonPart:
        return paintMediaReturnToRealtimeButton(o, paintInfo, integralSnappedRect);
    case MediaToggleClosedCaptionsButtonPart:
        return paintMediaToggleClosedCaptionsButton(o, paintInfo, integralSnappedRect);
    case MediaSliderPart:
        return paintMediaSliderTrack(o, paintInfo, integralSnappedRect);
    case MediaSliderThumbPart:
        return paintMediaSliderThumb(o, paintInfo, integralSnappedRect);
    case MediaVolumeSliderMuteButtonPart:
        return paintMediaMuteButton(o, paintInfo, integralSnappedRect);
    case MediaVolumeSliderContainerPart:
        return paintMediaVolumeSliderContainer(o, paintInfo, integralSnappedRect);
    case MediaVolumeSliderPart:
        return paintMediaVolumeSliderTrack(o, paintInfo, integralSnappedRect);
    case MediaVolumeSliderThumbPart:
        return paintMediaVolumeSliderThumb(o, paintInfo, integralSnappedRect);
//.........这里部分代码省略.........

void FrameView::layout(bool allowSubtree)
{
    if (d->m_midLayout)
        return;

    d->m_layoutTimer.stop();
    d->m_delayedLayout = false;

    // Protect the view from being deleted during layout (in recalcStyle)
    RefPtr<FrameView> protector(this);

    if (!m_frame) {
        // FIXME: Do we need to set m_size.width here?
        // FIXME: Should we set m_size.height here too?
        m_size.setWidth(visibleWidth());
        return;
    }
    
    // we shouldn't enter layout() while painting
    ASSERT(!m_frame->isPainting());
    if (m_frame->isPainting())
        return;

    if (!allowSubtree && d->m_layoutRoot) {
        d->m_layoutRoot->markContainingBlocksForLayout(false);
        d->m_layoutRoot = 0;
    }

    ASSERT(m_frame->view() == this);
    // This early return should be removed when rdar://5598072 is resolved. In the meantime, there is a
    // gigantic CrashTracer because of this issue, and the early return will hopefully cause graceful 
    // failure instead.  
    if (m_frame->view() != this)
        return;

    Document* document = m_frame->document();
    if (!document) {
        // FIXME: Should we set m_size.height here too?
        m_size.setWidth(visibleWidth());
        return;
    }

    d->m_layoutSchedulingEnabled = false;

    if (!d->m_nestedLayoutCount && d->m_postLayoutTasksTimer.isActive()) {
        // This is a new top-level layout. If there are any remaining tasks from the previous
        // layout, finish them now.
        d->m_postLayoutTasksTimer.stop();
        performPostLayoutTasks();
    }

    // Viewport-dependent media queries may cause us to need completely different style information.
    // Check that here.
    if (document->styleSelector()->affectedByViewportChange())
        document->updateStyleSelector();

    // Always ensure our style info is up-to-date.  This can happen in situations where
    // the layout beats any sort of style recalc update that needs to occur.
    if (m_frame->needsReapplyStyles())
        m_frame->reapplyStyles();
    else if (document->hasChangedChild())
        document->recalcStyle();
    
    bool subtree = d->m_layoutRoot;

    // If there is only one ref to this view left, then its going to be destroyed as soon as we exit, 
    // so there's no point to continuing to layout
    if (protector->hasOneRef())
        return;

    RenderObject* root = subtree ? d->m_layoutRoot : document->renderer();
    if (!root) {
        // FIXME: Do we need to set m_size here?
        d->m_layoutSchedulingEnabled = true;
        return;
    }

    d->m_nestedLayoutCount++;

    ScrollbarMode hMode = d->m_hmode;
    ScrollbarMode vMode = d->m_vmode;

    if (!subtree) {
        RenderObject* rootRenderer = document->documentElement() ? document->documentElement()->renderer() : 0;
        if (document->isHTMLDocument()) {
            Node* body = static_cast<HTMLDocument*>(document)->body();
            if (body && body->renderer()) {
                if (body->hasTagName(framesetTag)) {
                    body->renderer()->setChildNeedsLayout(true);
                    vMode = ScrollbarAlwaysOff;
                    hMode = ScrollbarAlwaysOff;
                } else if (body->hasTagName(bodyTag)) {
                    if (!d->m_firstLayout && m_size.height() != visibleHeight()
                            && static_cast<RenderBox*>(body->renderer())->stretchesToViewHeight())
                        body->renderer()->setChildNeedsLayout(true);
                    // It's sufficient to just check the X overflow,
                    // since it's illegal to have visible in only one direction.
                    RenderObject* o = rootRenderer->style()->overflowX() == OVISIBLE 
                        ? body->renderer() : rootRenderer;
                    applyOverflowToViewport(o, hMode, vMode); // Only applies to HTML UAs, not to XML/XHTML UAs
//.........这里部分代码省略.........

void writeResources(TextStream& ts, const RenderObject& object, int indent)
{
    const RenderStyle* style = object.style();
    const SVGRenderStyle* svgStyle = style->svgStyle();

    if (!svgStyle->maskElement().isEmpty()) {
        if (RenderSVGResourceMasker* masker = getRenderSVGResourceById<RenderSVGResourceMasker>(object.document(), svgStyle->maskElement())) {
            writeIndent(ts, indent);
            ts << " ";
            writeNameAndQuotedValue(ts, "masker", svgStyle->maskElement());
            ts << " ";
            writeStandardPrefix(ts, *masker, 0);
            ts << " " << masker->resourceBoundingBox(object.objectBoundingBox()) << "\n";
        }
    }
    if (!svgStyle->clipPath().isEmpty()) {
        if (RenderSVGResourceClipper* clipper = getRenderSVGResourceById<RenderSVGResourceClipper>(object.document(), svgStyle->clipPath())) {
            writeIndent(ts, indent);
            ts << " ";
            writeNameAndQuotedValue(ts, "clipPath", svgStyle->clipPath());
            ts << " ";
            writeStandardPrefix(ts, *clipper, 0);
            ts << " " << clipper->resourceBoundingBox(object.objectBoundingBox()) << "\n";
        }
    }
    // FIXME: Handle other RenderSVGResource* classes here, after converting them from SVGResource*.
}