C++ SVGRenderingContext类代码示例

void RenderSVGRoot::paintReplaced(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
    // An empty viewport disables rendering.
    if (pixelSnappedBorderBoxRect().isEmpty())
        return;

    // Don't paint, if the context explicitly disabled it.
    if (paintInfo.context->paintingDisabled())
        return;

    // SVG outlines are painted during PaintPhaseForeground.
    if (paintInfo.phase == PaintPhaseOutline || paintInfo.phase == PaintPhaseSelfOutline)
        return;

    // An empty viewBox also disables rendering.
    // (http://www.w3.org/TR/SVG/coords.html#ViewBoxAttribute)
    SVGSVGElement* svg = toSVGSVGElement(node());
    ASSERT(svg);
    if (svg->hasEmptyViewBox())
        return;

    // Don't paint if we don't have kids, except if we have filters we should paint those.
    if (!firstChild()) {
        SVGResources* resources = SVGResourcesCache::cachedResourcesForRenderObject(this);
        if (!resources || !resources->filter())
            return;
    }

    // Make a copy of the PaintInfo because applyTransform will modify the damage rect.
    PaintInfo childPaintInfo(paintInfo);
    childPaintInfo.context->save();

    // Apply initial viewport clip
    if (shouldApplyViewportClip())
        childPaintInfo.context->clip(pixelSnappedIntRect(overflowClipRect(paintOffset)));

    // Convert from container offsets (html renderers) to a relative transform (svg renderers).
    // Transform from our paint container's coordinate system to our local coords.
    IntPoint adjustedPaintOffset = roundedIntPoint(paintOffset);
    childPaintInfo.applyTransform(AffineTransform::translation(adjustedPaintOffset.x(), adjustedPaintOffset.y()) * localToBorderBoxTransform());

    // SVGRenderingContext must be destroyed before we restore the childPaintInfo.context, because a filter may have
    // changed the context and it is only reverted when the SVGRenderingContext destructor finishes applying the filter.
    {
        SVGRenderingContext renderingContext;
        bool continueRendering = true;
        if (childPaintInfo.phase == PaintPhaseForeground) {
            renderingContext.prepareToRenderSVGContent(this, childPaintInfo);
            continueRendering = renderingContext.isRenderingPrepared();
        }

        if (continueRendering)
            RenderBox::paint(childPaintInfo, LayoutPoint());
    }

    childPaintInfo.context->restore();
}

void RenderSVGContainer::paint(PaintInfo& paintInfo, const LayoutPoint&)
{
    ANNOTATE_GRAPHICS_CONTEXT(paintInfo, this);

    if (paintInfo.context->paintingDisabled())
        return;

    // Spec: groups w/o children still may render filter content.
    if (!firstChild() && !selfWillPaint())
        return;

    FloatRect repaintRect = repaintRectInLocalCoordinates();
    if (!SVGRenderSupport::paintInfoIntersectsRepaintRect(repaintRect, localToParentTransform(), paintInfo))
        return;

    PaintInfo childPaintInfo(paintInfo);
    {
        GraphicsContextStateSaver stateSaver(*childPaintInfo.context);

        // Let the RenderSVGViewportContainer subclass clip if necessary
        applyViewportClip(childPaintInfo);

        childPaintInfo.applyTransform(localToParentTransform());

        SVGRenderingContext renderingContext;
        GraphicsContextCullSaver cullSaver(*childPaintInfo.context);
        bool continueRendering = true;
        if (childPaintInfo.phase == PaintPhaseForeground) {
            renderingContext.prepareToRenderSVGContent(this, childPaintInfo);
            continueRendering = renderingContext.isRenderingPrepared();

            if (continueRendering && document().settings()->containerCullingEnabled())
                cullSaver.cull(repaintRectInLocalCoordinates());
        }

        if (continueRendering) {
            childPaintInfo.updatePaintingRootForChildren(this);
            for (RenderObject* child = firstChild(); child; child = child->nextSibling())
                child->paint(childPaintInfo, IntPoint());
        }
    }

    // FIXME: This really should be drawn from local coordinates, but currently we hack it
    // to avoid our clip killing our outline rect.  Thus we translate our
    // outline rect into parent coords before drawing.
    // FIXME: This means our focus ring won't share our rotation like it should.
    // We should instead disable our clip during PaintPhaseOutline
    if ((paintInfo.phase == PaintPhaseOutline || paintInfo.phase == PaintPhaseSelfOutline) && style()->outlineWidth() && style()->visibility() == VISIBLE) {
        IntRect paintRectInParent = enclosingIntRect(localToParentTransform().mapRect(repaintRect));
        paintOutline(paintInfo, paintRectInParent);
    }
}

void RenderSVGForeignObject::paint(PaintInfo& paintInfo, const LayoutPoint&)
{
    if (paintInfo.context().paintingDisabled())
        return;

    if (paintInfo.phase != PaintPhaseForeground && paintInfo.phase != PaintPhaseSelection)
        return;

    PaintInfo childPaintInfo(paintInfo);
    GraphicsContextStateSaver stateSaver(childPaintInfo.context());
    childPaintInfo.applyTransform(localTransform());

    if (SVGRenderSupport::isOverflowHidden(*this))
        childPaintInfo.context().clip(m_viewport);

    SVGRenderingContext renderingContext;
    if (paintInfo.phase == PaintPhaseForeground) {
        renderingContext.prepareToRenderSVGContent(*this, childPaintInfo);
        if (!renderingContext.isRenderingPrepared())
            return;
    }

    LayoutPoint childPoint = IntPoint();
    if (paintInfo.phase == PaintPhaseSelection) {
        RenderBlock::paint(childPaintInfo, childPoint);
        return;
    }

    // Paint all phases of FO elements atomically, as though the FO element established its
    // own stacking context.
    childPaintInfo.phase = PaintPhaseBlockBackground;
    RenderBlock::paint(childPaintInfo, childPoint);
    childPaintInfo.phase = PaintPhaseChildBlockBackgrounds;
    RenderBlock::paint(childPaintInfo, childPoint);
    childPaintInfo.phase = PaintPhaseFloat;
    RenderBlock::paint(childPaintInfo, childPoint);
    childPaintInfo.phase = PaintPhaseForeground;
    RenderBlock::paint(childPaintInfo, childPoint);
    childPaintInfo.phase = PaintPhaseOutline;
    RenderBlock::paint(childPaintInfo, childPoint);
}

void RenderSVGRoot::paintReplaced(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
    // An empty viewport disables rendering.
    if (borderBoxRect().isEmpty())
        return;

    // Don't paint, if the context explicitly disabled it.
    if (paintInfo.context().paintingDisabled())
        return;

    // SVG outlines are painted during PaintPhaseForeground.
    if (paintInfo.phase == PaintPhaseOutline || paintInfo.phase == PaintPhaseSelfOutline)
        return;

    // An empty viewBox also disables rendering.
    // (http://www.w3.org/TR/SVG/coords.html#ViewBoxAttribute)
    if (svgSVGElement().hasEmptyViewBox())
        return;

    Page* page = frame().page();

    // Don't paint if we don't have kids, except if we have filters we should paint those.
    if (!firstChild()) {
        auto* resources = SVGResourcesCache::cachedResourcesForRenderer(*this);
        if (!resources || !resources->filter()) {
            if (page && paintInfo.phase == PaintPhaseForeground)
                page->addRelevantUnpaintedObject(this, visualOverflowRect());
            return;
        }
    }

    if (page && paintInfo.phase == PaintPhaseForeground)
        page->addRelevantRepaintedObject(this, visualOverflowRect());

    // Make a copy of the PaintInfo because applyTransform will modify the damage rect.
    PaintInfo childPaintInfo(paintInfo);
    childPaintInfo.context().save();

    // Apply initial viewport clip
    if (shouldApplyViewportClip())
        childPaintInfo.context().clip(snappedIntRect(overflowClipRect(paintOffset, currentRenderNamedFlowFragment())));

    // Convert from container offsets (html renderers) to a relative transform (svg renderers).
    // Transform from our paint container's coordinate system to our local coords.
    IntPoint adjustedPaintOffset = roundedIntPoint(paintOffset);
    childPaintInfo.applyTransform(AffineTransform::translation(adjustedPaintOffset.x(), adjustedPaintOffset.y()) * localToBorderBoxTransform());

    // SVGRenderingContext must be destroyed before we restore the childPaintInfo.context(), because a filter may have
    // changed the context and it is only reverted when the SVGRenderingContext destructor finishes applying the filter.
    {
        SVGRenderingContext renderingContext;
        bool continueRendering = true;
        if (childPaintInfo.phase == PaintPhaseForeground) {
            renderingContext.prepareToRenderSVGContent(*this, childPaintInfo);
            continueRendering = renderingContext.isRenderingPrepared();
        }

        if (continueRendering) {
            childPaintInfo.updateSubtreePaintRootForChildren(this);
            for (auto& child : childrenOfType<RenderElement>(*this))
                child.paint(childPaintInfo, location());
        }
    }

    childPaintInfo.context().restore();
}