C++ LayoutView::assertSubtreeIsLaidOut方法代码示例

void FramePainter::paintContents(GraphicsContext& context, const GlobalPaintFlags globalPaintFlags, const IntRect& rect)
{
    Document* document = frameView().frame().document();

#ifndef NDEBUG
    bool fillWithRed;
    if (document->printing())
        fillWithRed = false; // Printing, don't fill with red (can't remember why).
    else if (frameView().frame().owner())
        fillWithRed = false; // Subframe, don't fill with red.
    else if (frameView().isTransparent())
        fillWithRed = false; // Transparent, don't fill with red.
    else if (globalPaintFlags & GlobalPaintSelectionOnly)
        fillWithRed = false; // Selections are transparent, don't fill with red.
    else
        fillWithRed = true;

    if (fillWithRed && !LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(context, *frameView().layoutView(), DisplayItem::DebugRedFill, LayoutPoint())) {
        IntRect contentRect(IntPoint(), frameView().contentsSize());
        LayoutObjectDrawingRecorder drawingRecorder(context, *frameView().layoutView(), DisplayItem::DebugRedFill, contentRect, LayoutPoint());
    }
#endif

    LayoutView* layoutView = frameView().layoutView();
    if (!layoutView) {
        WTF_LOG_ERROR("called FramePainter::paint with nil layoutObject");
        return;
    }

    if (!frameView().shouldThrottleRendering()) {
        RELEASE_ASSERT(!frameView().needsLayout());
        ASSERT(document->lifecycle().state() >= DocumentLifecycle::CompositingClean);
    }

    TRACE_EVENT1("devtools.timeline", "Paint", "data", InspectorPaintEvent::data(layoutView, LayoutRect(rect), 0));

    bool isTopLevelPainter = !s_inPaintContents;
    s_inPaintContents = true;

    FontCachePurgePreventer fontCachePurgePreventer;

    // TODO(jchaffraix): GlobalPaintFlags should be const during a paint
    // phase. Thus we should set this flag upfront (crbug.com/510280).
    GlobalPaintFlags localPaintFlags = globalPaintFlags;
    if (document->printing())
        localPaintFlags |= GlobalPaintFlattenCompositingLayers | GlobalPaintPrinting;

    PaintLayer* rootLayer = layoutView->layer();

#if ENABLE(ASSERT)
    if (!frameView().shouldThrottleRendering())
        layoutView->assertSubtreeIsLaidOut();
    LayoutObject::SetLayoutNeededForbiddenScope forbidSetNeedsLayout(*rootLayer->layoutObject());
#endif

    PaintLayerPainter layerPainter(*rootLayer);

    float deviceScaleFactor = blink::deviceScaleFactor(rootLayer->layoutObject()->frame());
    context.setDeviceScaleFactor(deviceScaleFactor);

    layerPainter.paint(context, LayoutRect(rect), localPaintFlags);

    if (rootLayer->containsDirtyOverlayScrollbars())
        layerPainter.paintOverlayScrollbars(context, LayoutRect(rect), localPaintFlags);

    // Regions may have changed as a result of the visibility/z-index of element changing.
    if (document->annotatedRegionsDirty())
        frameView().updateDocumentAnnotatedRegions();

    if (isTopLevelPainter) {
        // Everything that happens after paintContents completions is considered
        // to be part of the next frame.
        memoryCache()->updateFramePaintTimestamp();
        s_inPaintContents = false;
    }

    InspectorInstrumentation::didPaint(layoutView, 0, context, LayoutRect(rect));
}

void FramePainter::paintContents(GraphicsContext* context, const IntRect& rect)
{
    Document* document = m_frameView.frame().document();

#ifndef NDEBUG
    bool fillWithRed;
    if (document->printing())
        fillWithRed = false; // Printing, don't fill with red (can't remember why).
    else if (m_frameView.frame().owner())
        fillWithRed = false; // Subframe, don't fill with red.
    else if (m_frameView.isTransparent())
        fillWithRed = false; // Transparent, don't fill with red.
    else if (m_frameView.paintBehavior() & PaintBehaviorSelectionOnly)
        fillWithRed = false; // Selections are transparent, don't fill with red.
    else if (m_frameView.nodeToDraw())
        fillWithRed = false; // Element images are transparent, don't fill with red.
    else
        fillWithRed = true;

    if (fillWithRed) {
        IntRect contentRect(IntPoint(), m_frameView.contentsSize());
        DrawingRecorder drawingRecorder(*context, *m_frameView.layoutView(), DisplayItem::DebugRedFill, contentRect);
        if (!drawingRecorder.canUseCachedDrawing())
            context->fillRect(contentRect, Color(0xFF, 0, 0));
    }
#endif

    LayoutView* layoutView = m_frameView.layoutView();
    if (!layoutView) {
        WTF_LOG_ERROR("called FramePainter::paint with nil renderer");
        return;
    }

    RELEASE_ASSERT(!m_frameView.needsLayout());
    ASSERT(document->lifecycle().state() >= DocumentLifecycle::CompositingClean);

    TRACE_EVENT1(TRACE_DISABLED_BY_DEFAULT("devtools.timeline"), "Paint", "data", InspectorPaintEvent::data(layoutView, LayoutRect(rect), 0));

    bool isTopLevelPainter = !s_inPaintContents;
    s_inPaintContents = true;

    FontCachePurgePreventer fontCachePurgePreventer;

    PaintBehavior oldPaintBehavior = m_frameView.paintBehavior();

    if (FrameView* parentView = m_frameView.parentFrameView()) {
        if (parentView->paintBehavior() & PaintBehaviorFlattenCompositingLayers)
            m_frameView.setPaintBehavior(m_frameView.paintBehavior() | PaintBehaviorFlattenCompositingLayers);
    }

    if (m_frameView.paintBehavior() == PaintBehaviorNormal)
        document->markers().invalidateRenderedRectsForMarkersInRect(LayoutRect(rect));

    if (document->printing())
        m_frameView.setPaintBehavior(m_frameView.paintBehavior() | PaintBehaviorFlattenCompositingLayers);

    ASSERT(!m_frameView.isPainting());
    m_frameView.setIsPainting(true);

    // m_frameView.nodeToDraw() is used to draw only one element (and its descendants)
    LayoutObject* renderer = m_frameView.nodeToDraw() ? m_frameView.nodeToDraw()->layoutObject() : 0;
    DeprecatedPaintLayer* rootLayer = layoutView->layer();

#if ENABLE(ASSERT)
    layoutView->assertSubtreeIsLaidOut();
    LayoutObject::SetLayoutNeededForbiddenScope forbidSetNeedsLayout(*rootLayer->layoutObject());
#endif

    DeprecatedPaintLayerPainter layerPainter(*rootLayer);

    float deviceScaleFactor = blink::deviceScaleFactor(rootLayer->layoutObject()->frame());
    context->setDeviceScaleFactor(deviceScaleFactor);

    layerPainter.paint(context, LayoutRect(rect), m_frameView.paintBehavior(), renderer);

    if (rootLayer->containsDirtyOverlayScrollbars())
        layerPainter.paintOverlayScrollbars(context, LayoutRect(rect), m_frameView.paintBehavior(), renderer);

    m_frameView.setIsPainting(false);

    m_frameView.setPaintBehavior(oldPaintBehavior);
    m_frameView.setLastPaintTime(currentTime());

    // Regions may have changed as a result of the visibility/z-index of element changing.
    if (document->annotatedRegionsDirty())
        m_frameView.updateAnnotatedRegions();

    if (isTopLevelPainter) {
        // Everything that happens after paintContents completions is considered
        // to be part of the next frame.
        memoryCache()->updateFramePaintTimestamp();
        s_inPaintContents = false;
    }

    InspectorInstrumentation::didPaint(layoutView, 0, context, LayoutRect(rect));
}