root/Source/core/rendering/svg/RenderSVGResourceContainer.cpp

DEFINITIONS

1. svgExtensionsFromElement
2. m_isInvalidating
3. layout
4. willBeDestroyed
5. styleDidChange
6. idChanged
7. markAllClientsForInvalidation
8. markAllClientLayersForInvalidation
9. markClientForInvalidation
10. addClient
11. removeClient
12. addClientRenderLayer
13. addClientRenderLayer
14. removeClientRenderLayer
15. invalidateCacheAndMarkForLayout
16. registerResource
17. shouldTransformOnTextPainting
18. transformOnNonScalingStroke

/*
 * Copyright (C) Research In Motion Limited 2010. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#include "config.h"

#include "core/rendering/svg/RenderSVGResourceContainer.h"

#include "core/rendering/LayoutRectRecorder.h"
#include "core/rendering/RenderLayer.h"
#include "core/rendering/RenderView.h"
#include "core/rendering/svg/SVGRenderingContext.h"
#include "core/rendering/svg/SVGResourcesCache.h"
#include "core/svg/SVGGraphicsElement.h"

#include "wtf/TemporaryChange.h"

namespace WebCore {

static inline SVGDocumentExtensions& svgExtensionsFromElement(SVGElement* element)
{
    ASSERT(element);
    return element->document().accessSVGExtensions();
}

RenderSVGResourceContainer::RenderSVGResourceContainer(SVGElement* node)
    : RenderSVGHiddenContainer(node)
    , m_isInLayout(false)
    , m_id(node->getIdAttribute())
    , m_invalidationMask(0)
    , m_registered(false)
    , m_isInvalidating(false)
{
}

RenderSVGResourceContainer::~RenderSVGResourceContainer()
{
    if (m_registered)
        svgExtensionsFromElement(element()).removeResource(m_id);
}

void RenderSVGResourceContainer::layout()
{
    // FIXME: Investigate a way to detect and break resource layout dependency cycles early.
    // Then we can remove this method altogether, and fall back onto RenderSVGHiddenContainer::layout().
    ASSERT(needsLayout());
    if (m_isInLayout)
        return;

    LayoutRectRecorder recorder(*this);
    TemporaryChange<bool> inLayoutChange(m_isInLayout, true);

    RenderSVGHiddenContainer::layout();

    clearInvalidationMask();
}

void RenderSVGResourceContainer::willBeDestroyed()
{
    SVGResourcesCache::resourceDestroyed(this);
    RenderSVGHiddenContainer::willBeDestroyed();
}

void RenderSVGResourceContainer::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
{
    RenderSVGHiddenContainer::styleDidChange(diff, oldStyle);

    if (!m_registered) {
        m_registered = true;
        registerResource();
    }
}

void RenderSVGResourceContainer::idChanged()
{
    // Invalidate all our current clients.
    removeAllClientsFromCache();

    // Remove old id, that is guaranteed to be present in cache.
    SVGDocumentExtensions& extensions = svgExtensionsFromElement(element());
    extensions.removeResource(m_id);
    m_id = element()->getIdAttribute();

    registerResource();
}

void RenderSVGResourceContainer::markAllClientsForInvalidation(InvalidationMode mode)
{
    if ((m_clients.isEmpty() && m_clientLayers.isEmpty()) || m_isInvalidating)
        return;

    if (m_invalidationMask & mode)
        return;

    m_invalidationMask |= mode;
    m_isInvalidating = true;
    bool needsLayout = mode == LayoutAndBoundariesInvalidation;
    bool markForInvalidation = mode != ParentOnlyInvalidation;

    HashSet<RenderObject*>::iterator end = m_clients.end();
    for (HashSet<RenderObject*>::iterator it = m_clients.begin(); it != end; ++it) {
        RenderObject* client = *it;
        if (client->isSVGResourceContainer()) {
            toRenderSVGResourceContainer(client)->removeAllClientsFromCache(markForInvalidation);
            continue;
        }

        if (markForInvalidation)
            markClientForInvalidation(client, mode);

        RenderSVGResource::markForLayoutAndParentResourceInvalidation(client, needsLayout);
    }

    markAllClientLayersForInvalidation();

    m_isInvalidating = false;
}

void RenderSVGResourceContainer::markAllClientLayersForInvalidation()
{
    HashSet<RenderLayer*>::iterator layerEnd = m_clientLayers.end();
    for (HashSet<RenderLayer*>::iterator it = m_clientLayers.begin(); it != layerEnd; ++it)
        (*it)->filterNeedsRepaint();
}

void RenderSVGResourceContainer::markClientForInvalidation(RenderObject* client, InvalidationMode mode)
{
    ASSERT(client);
    ASSERT(!m_clients.isEmpty());

    switch (mode) {
    case LayoutAndBoundariesInvalidation:
    case BoundariesInvalidation:
        client->setNeedsBoundariesUpdate();
        break;
    case RepaintInvalidation:
        if (client->view()) {
            if (RuntimeEnabledFeatures::repaintAfterLayoutEnabled() && frameView()->isInPerformLayout())
                client->setShouldDoFullRepaintAfterLayout(true);
            else
                client->repaint();
        }
        break;
    case ParentOnlyInvalidation:
        break;
    }
}

void RenderSVGResourceContainer::addClient(RenderObject* client)
{
    ASSERT(client);
    m_clients.add(client);
    clearInvalidationMask();
}

void RenderSVGResourceContainer::removeClient(RenderObject* client)
{
    ASSERT(client);
    removeClientFromCache(client, false);
    m_clients.remove(client);
}

void RenderSVGResourceContainer::addClientRenderLayer(Node* node)
{
    ASSERT(node);
    if (!node->renderer() || !node->renderer()->hasLayer())
        return;
    m_clientLayers.add(toRenderLayerModelObject(node->renderer())->layer());
    clearInvalidationMask();
}

void RenderSVGResourceContainer::addClientRenderLayer(RenderLayer* client)
{
    ASSERT(client);
    m_clientLayers.add(client);
    clearInvalidationMask();
}

void RenderSVGResourceContainer::removeClientRenderLayer(RenderLayer* client)
{
    ASSERT(client);
    m_clientLayers.remove(client);
}

void RenderSVGResourceContainer::invalidateCacheAndMarkForLayout(SubtreeLayoutScope* layoutScope)
{
    if (selfNeedsLayout())
        return;

    setNeedsLayout(MarkContainingBlockChain, layoutScope);

    if (everHadLayout())
        removeAllClientsFromCache();
}

void RenderSVGResourceContainer::registerResource()
{
    SVGDocumentExtensions& extensions = svgExtensionsFromElement(element());
    if (!extensions.hasPendingResource(m_id)) {
        extensions.addResource(m_id, this);
        return;
    }

    OwnPtr<SVGDocumentExtensions::SVGPendingElements> clients(extensions.removePendingResource(m_id));

    // Cache us with the new id.
    extensions.addResource(m_id, this);

    // Update cached resources of pending clients.
    const SVGDocumentExtensions::SVGPendingElements::const_iterator end = clients->end();
    for (SVGDocumentExtensions::SVGPendingElements::const_iterator it = clients->begin(); it != end; ++it) {
        ASSERT((*it)->hasPendingResources());
        extensions.clearHasPendingResourcesIfPossible(*it);
        RenderObject* renderer = (*it)->renderer();
        if (!renderer)
            continue;
        SVGResourcesCache::clientStyleChanged(renderer, StyleDifferenceLayout, renderer->style());
        renderer->setNeedsLayout();
    }
}

bool RenderSVGResourceContainer::shouldTransformOnTextPainting(RenderObject* object, AffineTransform& resourceTransform)
{
    ASSERT_UNUSED(object, object);

    // This method should only be called for RenderObjects that deal with text rendering. Cmp. RenderObject.h's is*() methods.
    ASSERT(object->isSVGText() || object->isSVGTextPath() || object->isSVGInline());

    // In text drawing, the scaling part of the graphics context CTM is removed, compare SVGInlineTextBox::paintTextWithShadows.
    // So, we use that scaling factor here, too, and then push it down to pattern or gradient space
    // in order to keep the pattern or gradient correctly scaled.
    float scalingFactor = SVGRenderingContext::calculateScreenFontSizeScalingFactor(object);
    if (scalingFactor == 1)
        return false;
    resourceTransform.scale(scalingFactor);
    return true;
}

// FIXME: This does not belong here.
AffineTransform RenderSVGResourceContainer::transformOnNonScalingStroke(RenderObject* object, const AffineTransform& resourceTransform)
{
    if (!object->isSVGShape())
        return resourceTransform;

    SVGGraphicsElement* element = toSVGGraphicsElement(object->node());
    AffineTransform transform = element->getScreenCTM(SVGGraphicsElement::DisallowStyleUpdate);
    transform *= resourceTransform;
    return transform;
}

}