/*

   Copyright (C) 2007 Eric Seidel <eric@webkit.org>

   Copyright (C) 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>

   Copyright (C) 2008 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"

#if ENABLE(SVG_FONTS)

#include "SVGGlyphElement.h"

#include "Attribute.h"

#include "SVGFontData.h"

#include "SVGFontElement.h"

#include "SVGFontFaceElement.h"

#include "SVGNames.h"

#include "SVGPathBuilder.h"

#include "SimpleFontData.h"

#include "XMLNames.h"

namespace WebCore {

using namespace SVGNames;

SVGGlyphElement::SVGGlyphElement(const QualifiedName& tagName, Document* doc)

    : SVGStyledElement(tagName, doc)

{

}

SVGGlyphElement::~SVGGlyphElement()

{

}

void SVGGlyphElement::invalidateGlyphCache()

{

    Node* fontNode = parentNode();

    if (fontNode && fontNode->hasTagName(SVGNames::fontTag)) {

        if (SVGFontElement* element = static_cast<SVGFontElement*>(fontNode))

            element->invalidateGlyphCache();

    }

}

void SVGGlyphElement::parseMappedAttribute(Attribute* attr)

{

    if (attr->name() == SVGNames::dAttr)

        invalidateGlyphCache();

    else

        SVGStyledElement::parseMappedAttribute(attr);

}

void SVGGlyphElement::insertedIntoDocument()

{

    invalidateGlyphCache();

    SVGStyledElement::insertedIntoDocument();

}

void SVGGlyphElement::removedFromDocument()

{

    invalidateGlyphCache();

    SVGStyledElement::removedFromDocument();

}

static inline SVGGlyphIdentifier::ArabicForm parseArabicForm(const AtomicString& value)

{

    if (value == "medial")

        return SVGGlyphIdentifier::Medial;

    else if (value == "terminal")

        return SVGGlyphIdentifier::Terminal;

    else if (value == "isolated")

        return SVGGlyphIdentifier::Isolated;

    else if (value == "initial")

        return SVGGlyphIdentifier::Initial;

    return SVGGlyphIdentifier::None;

}

static inline SVGGlyphIdentifier::Orientation parseOrientation(const AtomicString& value)

{

    if (value == "h")

        return SVGGlyphIdentifier::Horizontal;

    else if (value == "v")

        return SVGGlyphIdentifier::Vertical;

    return SVGGlyphIdentifier::Both;

}

static inline Path parsePathData(const AtomicString& value)

{

    Path result;

    SVGPathBuilder builder(result);

    // FIXME: We should analyse the returned value.

    builder.build(value);

    return result;

}

void SVGGlyphElement::inheritUnspecifiedAttributes(SVGGlyphIdentifier& identifier, const SVGFontData* svgFontData)

{

    if (identifier.horizontalAdvanceX == SVGGlyphIdentifier::inheritedValue())

        identifier.horizontalAdvanceX = svgFontData->horizontalAdvanceX();

    if (identifier.verticalOriginX == SVGGlyphIdentifier::inheritedValue())

        identifier.verticalOriginX = svgFontData->verticalOriginX();

    if (identifier.verticalOriginY == SVGGlyphIdentifier::inheritedValue())

        identifier.verticalOriginY = svgFontData->verticalOriginY();

    if (identifier.verticalAdvanceY == SVGGlyphIdentifier::inheritedValue())

        identifier.verticalAdvanceY = svgFontData->verticalAdvanceY();

}

static inline float parseSVGGlyphAttribute(const SVGElement* element, const WebCore::QualifiedName& name)

{

    AtomicString value(element->getAttribute(name));

    if (value.isEmpty())

        return SVGGlyphIdentifier::inheritedValue();

    return value.toFloat();

}

SVGGlyphIdentifier SVGGlyphElement::buildGenericGlyphIdentifier(const SVGElement* element)

{

    SVGGlyphIdentifier identifier;

    identifier.pathData = parsePathData(element->getAttribute(dAttr));

    // Spec: The horizontal advance after rendering the glyph in horizontal orientation.

    // If the attribute is not specified, the effect is as if the attribute were set to the

    // value of the font's horiz-adv-x attribute. Glyph widths are required to be non-negative,

    // even if the glyph is typically rendered right-to-left, as in Hebrew and Arabic scripts.

    identifier.horizontalAdvanceX = parseSVGGlyphAttribute(element, horiz_adv_xAttr);

    // Spec: The X-coordinate in the font coordinate system of the origin of the glyph to be

    // used when drawing vertically oriented text. If the attribute is not specified, the effect

    // is as if the attribute were set to the value of the font's vert-origin-x attribute.

    identifier.verticalOriginX = parseSVGGlyphAttribute(element, vert_origin_xAttr);

    // Spec: The Y-coordinate in the font coordinate system of the origin of a glyph to be

    // used when drawing vertically oriented text. If the attribute is not specified, the effect

    // is as if the attribute were set to the value of the font's vert-origin-y attribute.

    identifier.verticalOriginY = parseSVGGlyphAttribute(element, vert_origin_yAttr);

    // Spec: The vertical advance after rendering a glyph in vertical orientation.

    // If the attribute is not specified, the effect is as if the attribute were set to the

    // value of the font's vert-adv-y attribute.

    identifier.verticalAdvanceY = parseSVGGlyphAttribute(element, vert_adv_yAttr);

    return identifier;

}

SVGGlyphIdentifier SVGGlyphElement::buildGlyphIdentifier() const

{

    SVGGlyphIdentifier identifier(buildGenericGlyphIdentifier(this));

    identifier.glyphName = getAttribute(glyph_nameAttr);

    identifier.orientation = parseOrientation(getAttribute(orientationAttr));

    identifier.arabicForm = parseArabicForm(getAttribute(arabic_formAttr));

    String language = getAttribute(SVGNames::langAttr);

    if (!language.isEmpty())

        identifier.languages = parseDelimitedString(language, ',');

    return identifier;

}

}

#endif // ENABLE(SVG_FONTS)