RenderLayerFilterInfo.cpp   [plain text]

/*
 * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
 * Copyright (C) 2013 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above
 *    copyright notice, this list of conditions and the following
 *    disclaimer.
 * 2. Redistributions in binary form must reproduce the above
 *    copyright notice, this list of conditions and the following
 *    disclaimer in the documentation and/or other materials
 *    provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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#include "config.h"

#if ENABLE(CSS_FILTERS)
#include "RenderLayerFilterInfo.h"

#include "CachedSVGDocument.h"
#include "CachedSVGDocumentReference.h"
#include "FilterEffectRenderer.h"
#include "SVGElement.h"
#include "SVGFilter.h"
#include "SVGFilterPrimitiveStandardAttributes.h"
#include <wtf/NeverDestroyed.h>

namespace WebCore {

HashMap<const RenderLayer*, std::unique_ptr<RenderLayer::FilterInfo>>& RenderLayer::FilterInfo::map()
{
    static NeverDestroyed<HashMap<const RenderLayer*, std::unique_ptr<FilterInfo>>> map;
    return map;
}

RenderLayer::FilterInfo* RenderLayer::FilterInfo::getIfExists(const RenderLayer& layer)
{
    ASSERT(layer.m_hasFilterInfo == map().contains(&layer));

    return layer.m_hasFilterInfo ? map().get(&layer) : 0;
}

RenderLayer::FilterInfo& RenderLayer::FilterInfo::get(RenderLayer& layer)
{
    ASSERT(layer.m_hasFilterInfo == map().contains(&layer));

    auto& info = map().add(&layer, nullptr).iterator->value;
    if (!info) {
        info = std::make_unique<FilterInfo>(layer);
        layer.m_hasFilterInfo = true;
    }
    return *info;
}

void RenderLayer::FilterInfo::remove(RenderLayer& layer)
{
    ASSERT(layer.m_hasFilterInfo == map().contains(&layer));

    if (map().remove(&layer))
        layer.m_hasFilterInfo = false;
}

RenderLayer::FilterInfo::FilterInfo(RenderLayer& layer)
    : m_layer(layer)
{
}

RenderLayer::FilterInfo::~FilterInfo()
{
    removeReferenceFilterClients();
}

void RenderLayer::FilterInfo::setRenderer(PassRefPtr<FilterEffectRenderer> renderer)
{ 
    m_renderer = renderer; 
}

void RenderLayer::FilterInfo::notifyFinished(CachedResource*)
{
    m_layer.filterNeedsRepaint();
}
    
void RenderLayer::FilterInfo::updateReferenceFilterClients(const FilterOperations& operations)
{
    removeReferenceFilterClients();
    for (size_t i = 0, size = operations.size(); i < size; ++i) {
        FilterOperation* filterOperation = operations.operations()[i].get();
        if (filterOperation->type() != FilterOperation::REFERENCE)
            continue;
        ReferenceFilterOperation* referenceFilterOperation = toReferenceFilterOperation(filterOperation);
        CachedSVGDocumentReference* documentReference = referenceFilterOperation->cachedSVGDocumentReference();
        CachedSVGDocument* cachedSVGDocument = documentReference ? documentReference->document() : 0;

        if (cachedSVGDocument) {
            // Reference is external; wait for notifyFinished().
            cachedSVGDocument->addClient(this);
            m_externalSVGReferences.append(cachedSVGDocument);
        } else {
            // Reference is internal; add layer as a client so we can trigger
            // filter repaint on SVG attribute change.
            Element* filter = m_layer.renderer().document().getElementById(referenceFilterOperation->fragment());

            if (!filter || !filter->renderer() || !filter->renderer()->isSVGResourceFilter())
                continue;
            toRenderSVGResourceContainer(*filter->renderer()).addClientRenderLayer(&m_layer);
            m_internalSVGReferences.append(filter);
        }
    }
}

void RenderLayer::FilterInfo::removeReferenceFilterClients()
{
    for (size_t i = 0, size = m_externalSVGReferences.size(); i < size; ++i)
        m_externalSVGReferences[i]->removeClient(this);
    m_externalSVGReferences.clear();
    for (size_t i = 0, size = m_internalSVGReferences.size(); i < size; ++i) {
        Element* filter = m_internalSVGReferences[i].get();
        if (!filter->renderer())
            continue;
        toRenderSVGResourceContainer(*filter->renderer()).removeClientRenderLayer(&m_layer);
    }
    m_internalSVGReferences.clear();
}

} // namespace WebCore

#endif // ENABLE(CSS_FILTERS)