/*

    Copyright (C) 2004, 2005, 2008 Nikolas Zimmermann <zimmermann@kde.org>

                  2004, 2005, 2006, 2007, 2010 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)

#include "SVGFitToViewBox.h"

#include "AffineTransform.h"

#include "Attr.h"

#include "Document.h"

#include "FloatRect.h"

#include "SVGNames.h"

#include "SVGParserUtilities.h"

#include "SVGPreserveAspectRatio.h"

#include "StringImpl.h"

namespace WebCore {

SVGFitToViewBox::SVGFitToViewBox()

{

}

SVGFitToViewBox::~SVGFitToViewBox()

{

}

bool SVGFitToViewBox::parseViewBox(Document* doc, const String& s, FloatRect& viewBox)

{

    const UChar* c = s.characters();

    const UChar* end = c + s.length();

    return parseViewBox(doc, c, end, viewBox, true);

}

bool SVGFitToViewBox::parseViewBox(Document* doc, const UChar*& c, const UChar* end, FloatRect& viewBox, bool validate)

{

    String str(c, end - c);

    skipOptionalSpaces(c, end);

    float x = 0.0f;

    float y = 0.0f;

    float width = 0.0f;

    float height = 0.0f;

    bool valid = (parseNumber(c, end, x) && parseNumber(c, end, y) &&

          parseNumber(c, end, width) && parseNumber(c, end, height, false));

    if (!validate) {

        viewBox = FloatRect(x, y, width, height);

        return true;

    }

    if (!valid) {

        doc->accessSVGExtensions()->reportWarning("Problem parsing viewBox=\"" + str + "\"");

        return false;

    }

    if (width < 0.0) { // check that width is positive

        doc->accessSVGExtensions()->reportError("A negative value for ViewBox width is not allowed");

        return false;

    }

    if (height < 0.0) { // check that height is positive

        doc->accessSVGExtensions()->reportError("A negative value for ViewBox height is not allowed");

        return false;

    }

    skipOptionalSpaces(c, end);

    if (c < end) { // nothing should come after the last, fourth number

        doc->accessSVGExtensions()->reportWarning("Problem parsing viewBox=\"" + str + "\"");

        return false;

    }

    viewBox = FloatRect(x, y, width, height);

    return true;

}

AffineTransform SVGFitToViewBox::viewBoxToViewTransform(const FloatRect& viewBoxRect, const SVGPreserveAspectRatio& preserveAspectRatio, float viewWidth, float viewHeight)

{

    if (!viewBoxRect.width() || !viewBoxRect.height())

        return AffineTransform();

    return preserveAspectRatio.getCTM(viewBoxRect.x(), viewBoxRect.y(), viewBoxRect.width(), viewBoxRect.height(), 0, 0, viewWidth, viewHeight);

}

bool SVGFitToViewBox::parseMappedAttribute(Document* document, Attribute* attr)

{

    if (attr->name() == SVGNames::viewBoxAttr) {

        FloatRect viewBox;

        if (!attr->value().isNull()) {

            if (!parseViewBox(document, attr->value(), viewBox))

                return true;

        }

        setViewBoxBaseValue(viewBox);

    } else if (attr->name() == SVGNames::preserveAspectRatioAttr) {

        SVGPreserveAspectRatio::parsePreserveAspectRatio(this, attr->value());

        return true;

    }

    return false;

}

bool SVGFitToViewBox::isKnownAttribute(const QualifiedName& attrName)

{

    return (attrName == SVGNames::viewBoxAttr ||

            attrName == SVGNames::preserveAspectRatioAttr);

}

}

#endif // ENABLE(SVG)