C++ SVGResourcesCache类代码示例

void SVGResourcesCache::clientStyleChanged(RenderObject* renderer, StyleDifference diff, const RenderStyle* newStyle)
{
    ASSERT(renderer);
    if (diff == StyleDifferenceEqual || !renderer->parent())
        return;

    // In this case the proper SVGFE*Element will decide whether the modified CSS properties require a relayout or repaint.
    if (renderer->isSVGResourceFilterPrimitive() && (diff == StyleDifferenceRepaint || diff == StyleDifferenceRepaintIfText))
        return;

    // Dynamic changes of CSS properties like 'clip-path' may require us to recompute the associated resources for a renderer.
    // FIXME: Avoid passing in a useless StyleDifference, but instead compare oldStyle/newStyle to see which resources changed
    // to be able to selectively rebuild individual resources, instead of all of them.
    if (rendererCanHaveResources(renderer)) {
        SVGResourcesCache* cache = resourcesCacheFromRenderObject(renderer);
        cache->removeResourcesFromRenderObject(renderer);
        cache->addResourcesFromRenderObject(renderer, newStyle);
    }

    RenderSVGResource::markForLayoutAndParentResourceInvalidation(renderer, false);

    // FIXME: This doesn't look right, we often go through here in styleDidChange which means
    // we're changing the needsStyleRecalc bits in the middle of recalcStyle on ourself which
    // makes no sense. It's also not clear why we'd go through here for non-SVG elements.
    if (renderer->node() && !renderer->node()->isSVGElement())
        renderer->node()->setNeedsStyleRecalc(LocalStyleChange, StyleChangeFromRenderer);
}

void SVGResourcesCache::clientDestroyed(RenderElement& renderer)
{
    SVGResources* resources = SVGResourcesCache::cachedResourcesForRenderObject(renderer);
    if (resources)
        resources->removeClientFromCache(renderer);

    SVGResourcesCache* cache = resourcesCacheFromRenderObject(renderer);
    cache->removeResourcesFromRenderer(renderer);
}

void SVGResourcesCache::clientUpdatedFromElement(RenderObject* renderer, const RenderStyle* newStyle)
{
    ASSERT(renderer);
    ASSERT(renderer->parent());

    SVGResourcesCache* cache = resourcesCacheFromRenderObject(renderer);
    cache->removeResourcesFromRenderObject(renderer);
    cache->addResourcesFromRenderObject(renderer, newStyle);
}

void SVGResourcesCache::clientWasAddedToTree(RenderObject* renderer, const RenderStyle* newStyle)
{
    if (!renderer->node())
        return;
    RenderSVGResource::markForLayoutAndParentResourceInvalidation(renderer, false);

    if (!rendererCanHaveResources(renderer))
        return;
    SVGResourcesCache* cache = resourcesCacheFromRenderObject(renderer);
    cache->addResourcesFromRenderObject(renderer, newStyle);
}

void SVGResourcesCache::clientDestroyed(LayoutObject* layoutObject)
{
    ASSERT(layoutObject);

    SVGResources* resources = SVGResourcesCache::cachedResourcesForLayoutObject(layoutObject);
    if (resources)
        resources->removeClientFromCache(layoutObject);

    SVGResourcesCache* cache = resourcesCacheFromLayoutObject(layoutObject);
    cache->removeResourcesFromLayoutObject(layoutObject);
}

void SVGResourcesCache::clientWillBeRemovedFromTree(LayoutObject* layoutObject)
{
    if (!layoutObject->node())
        return;
    LayoutSVGResourceContainer::markForLayoutAndParentResourceInvalidation(layoutObject, false);

    if (!layoutObjectCanHaveResources(layoutObject))
        return;
    SVGResourcesCache* cache = resourcesCacheFromLayoutObject(layoutObject);
    cache->removeResourcesFromLayoutObject(layoutObject);
}

void SVGResourcesCache::resourceDestroyed(RenderSVGResourceContainer* resource)
{
    ASSERT(resource);
    SVGResourcesCache* cache = resourcesCacheFromRenderObject(resource);

    // The resource itself may have clients, that need to be notified.
    cache->removeResourcesFromRenderObject(resource);

    HashMap<RenderObject*, SVGResources*>::iterator end = cache->m_cache.end();
    for (HashMap<RenderObject*, SVGResources*>::iterator it = cache->m_cache.begin(); it != end; ++it)
        it->second->resourceDestroyed(resource);
}

void SVGResourcesCache::clientWillBeRemovedFromTree(RenderObject& renderer)
{
    if (renderer.isAnonymous())
        return;

    RenderSVGResource::markForLayoutAndParentResourceInvalidation(renderer, false);

    if (!rendererCanHaveResources(renderer))
        return;
    RenderElement& elementRenderer = toRenderElement(renderer);
    SVGResourcesCache* cache = resourcesCacheFromRenderObject(elementRenderer);
    cache->removeResourcesFromRenderer(elementRenderer);
}

void SVGResourcesCache::clientUpdatedFromElement(RenderObject* renderer, const RenderStyle* newStyle)
{
    ASSERT(renderer);
    ASSERT(renderer->parent());

    SVGResourcesCache* cache = resourcesCacheFromRenderObject(renderer);
    cache->removeResourcesFromRenderObject(renderer);
    cache->addResourcesFromRenderObject(renderer, newStyle);

#if ENABLE(FILTERS)
    SVGResources* resources = SVGResourcesCache::cachedResourcesForRenderObject(renderer);
    if (resources && resources->filter())
        resources->removeClientFromCache(renderer);
#endif
}