xref: /external/chromium_org/third_party/WebKit/Source/core/svg/SVGFEBlendElement.cpp

/*
 * Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
 * Copyright (C) 2004, 2005, 2006 Rob Buis <buis@kde.org>
 *
 * 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/svg/SVGFEBlendElement.h"

#include "core/SVGNames.h"
#include "platform/graphics/filters/FEBlend.h"
#include "platform/graphics/filters/FilterEffect.h"
#include "core/svg/graphics/filters/SVGFilterBuilder.h"

namespace blink {

static WebBlendMode toWebBlendMode(SVGFEBlendElement::Mode mode)
{
#define MAP_BLEND_MODE(MODENAME)            \
    case SVGFEBlendElement::Mode##MODENAME: \
        return WebBlendMode##MODENAME

    switch (mode) {
        MAP_BLEND_MODE(Normal);
        MAP_BLEND_MODE(Multiply);
        MAP_BLEND_MODE(Screen);
        MAP_BLEND_MODE(Darken);
        MAP_BLEND_MODE(Lighten);
        MAP_BLEND_MODE(Overlay);
        MAP_BLEND_MODE(ColorDodge);
        MAP_BLEND_MODE(ColorBurn);
        MAP_BLEND_MODE(HardLight);
        MAP_BLEND_MODE(SoftLight);
        MAP_BLEND_MODE(Difference);
        MAP_BLEND_MODE(Exclusion);
        MAP_BLEND_MODE(Hue);
        MAP_BLEND_MODE(Saturation);
        MAP_BLEND_MODE(Color);
        MAP_BLEND_MODE(Luminosity);
    default:
        ASSERT_NOT_REACHED();
        return WebBlendModeNormal;
    }
#undef MAP_BLEND_MODE
}

template<> const SVGEnumerationStringEntries& getStaticStringEntries<SVGFEBlendElement::Mode>()
{
    DEFINE_STATIC_LOCAL(SVGEnumerationStringEntries, entries, ());
    if (entries.isEmpty()) {
        entries.append(std::make_pair(SVGFEBlendElement::ModeNormal, "normal"));
        entries.append(std::make_pair(SVGFEBlendElement::ModeMultiply, "multiply"));
        entries.append(std::make_pair(SVGFEBlendElement::ModeScreen, "screen"));
        entries.append(std::make_pair(SVGFEBlendElement::ModeDarken, "darken"));
        entries.append(std::make_pair(SVGFEBlendElement::ModeLighten, "lighten"));
        entries.append(std::make_pair(SVGFEBlendElement::ModeOverlay, "overlay"));
        entries.append(std::make_pair(SVGFEBlendElement::ModeColorDodge, "color-dodge"));
        entries.append(std::make_pair(SVGFEBlendElement::ModeColorBurn, "color-burn"));
        entries.append(std::make_pair(SVGFEBlendElement::ModeHardLight, "hard-light"));
        entries.append(std::make_pair(SVGFEBlendElement::ModeSoftLight, "soft-light"));
        entries.append(std::make_pair(SVGFEBlendElement::ModeDifference, "difference"));
        entries.append(std::make_pair(SVGFEBlendElement::ModeExclusion, "exclusion"));
        entries.append(std::make_pair(SVGFEBlendElement::ModeHue, "hue"));
        entries.append(std::make_pair(SVGFEBlendElement::ModeSaturation, "saturation"));
        entries.append(std::make_pair(SVGFEBlendElement::ModeColor, "color"));
        entries.append(std::make_pair(SVGFEBlendElement::ModeLuminosity, "luminosity"));
    }
    return entries;
}

template<> unsigned short getMaxExposedEnumValue<SVGFEBlendElement::Mode>()
{
    return SVGFEBlendElement::ModeLighten;
}

inline SVGFEBlendElement::SVGFEBlendElement(Document& document)
    : SVGFilterPrimitiveStandardAttributes(SVGNames::feBlendTag, document)
    , m_in1(SVGAnimatedString::create(this, SVGNames::inAttr, SVGString::create()))
    , m_in2(SVGAnimatedString::create(this, SVGNames::in2Attr, SVGString::create()))
    , m_mode(SVGAnimatedEnumeration<Mode>::create(this, SVGNames::modeAttr, SVGFEBlendElement::ModeNormal))
{
    addToPropertyMap(m_in1);
    addToPropertyMap(m_in2);
    addToPropertyMap(m_mode);
}

DEFINE_NODE_FACTORY(SVGFEBlendElement)

bool SVGFEBlendElement::isSupportedAttribute(const QualifiedName& attrName)
{
    DEFINE_STATIC_LOCAL(HashSet<QualifiedName>, supportedAttributes, ());
    if (supportedAttributes.isEmpty()) {
        supportedAttributes.add(SVGNames::modeAttr);
        supportedAttributes.add(SVGNames::inAttr);
        supportedAttributes.add(SVGNames::in2Attr);
    }
    return supportedAttributes.contains<SVGAttributeHashTranslator>(attrName);
}

void SVGFEBlendElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
{
    parseAttributeNew(name, value);
}

bool SVGFEBlendElement::setFilterEffectAttribute(FilterEffect* effect, const QualifiedName& attrName)
{
    FEBlend* blend = static_cast<FEBlend*>(effect);
    if (attrName == SVGNames::modeAttr)
        return blend->setBlendMode(toWebBlendMode(m_mode->currentValue()->enumValue()));

    ASSERT_NOT_REACHED();
    return false;
}

void SVGFEBlendElement::svgAttributeChanged(const QualifiedName& attrName)
{
    if (!isSupportedAttribute(attrName)) {
        SVGFilterPrimitiveStandardAttributes::svgAttributeChanged(attrName);
        return;
    }

    SVGElement::InvalidationGuard invalidationGuard(this);

    if (attrName == SVGNames::modeAttr) {
        primitiveAttributeChanged(attrName);
        return;
    }

    if (attrName == SVGNames::inAttr || attrName == SVGNames::in2Attr) {
        invalidate();
        return;
    }

    ASSERT_NOT_REACHED();
}

PassRefPtr<FilterEffect> SVGFEBlendElement::build(SVGFilterBuilder* filterBuilder, Filter* filter)
{
    FilterEffect* input1 = filterBuilder->getEffectById(AtomicString(m_in1->currentValue()->value()));
    FilterEffect* input2 = filterBuilder->getEffectById(AtomicString(m_in2->currentValue()->value()));

    if (!input1 || !input2)
        return nullptr;

    RefPtr<FilterEffect> effect = FEBlend::create(filter, toWebBlendMode(m_mode->currentValue()->enumValue()));
    FilterEffectVector& inputEffects = effect->inputEffects();
    inputEffects.reserveCapacity(2);
    inputEffects.append(input1);
    inputEffects.append(input2);
    return effect.release();
}

}