Source/core/svg/SVGPathUtilities.cpp

/*
 * Copyright (C) Research In Motion Limited 2010, 2012. 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/svg/SVGPathUtilities.h"

#include "core/svg/SVGPathBlender.h"
#include "core/svg/SVGPathBuilder.h"
#include "core/svg/SVGPathByteStreamBuilder.h"
#include "core/svg/SVGPathByteStreamSource.h"
#include "core/svg/SVGPathElement.h"
#include "core/svg/SVGPathParser.h"
#include "core/svg/SVGPathSegListBuilder.h"
#include "core/svg/SVGPathSegListSource.h"
#include "core/svg/SVGPathStringBuilder.h"
#include "core/svg/SVGPathStringSource.h"
#include "core/svg/SVGPathTraversalStateBuilder.h"
#include "platform/graphics/PathTraversalState.h"

namespace blink {

bool buildPathFromString(const String& d, Path& result)
{
    if (d.isEmpty())
        return true;

    SVGPathBuilder builder(result);
    SVGPathStringSource source(d);
    SVGPathParser parser(&source, &builder);
    return parser.parsePathDataFromSource(NormalizedParsing);
}

bool buildPathFromByteStream(const SVGPathByteStream& stream, Path& result)
{
    if (stream.isEmpty())
        return true;

    SVGPathBuilder builder(result);
    SVGPathByteStreamSource source(stream);
    SVGPathParser parser(&source, &builder);
    return parser.parsePathDataFromSource(NormalizedParsing);
}

bool buildStringFromByteStream(const SVGPathByteStream& stream, String& result, PathParsingMode parsingMode)
{
    if (stream.isEmpty())
        return true;

    SVGPathStringBuilder builder;
    SVGPathByteStreamSource source(stream);
    SVGPathParser parser(&source, &builder);
    bool ok = parser.parsePathDataFromSource(parsingMode);
    result = builder.result();
    return ok;
}

bool buildSVGPathByteStreamFromString(const String& d, SVGPathByteStream& result, PathParsingMode parsingMode)
{
    result.clear();
    if (d.isEmpty())
        return true;

    // The string length is typically a minor overestimate of eventual byte stream size, so it avoids us a lot of reallocs.
    result.reserveInitialCapacity(d.length());

    SVGPathByteStreamBuilder builder(result);
    SVGPathStringSource source(d);
    SVGPathParser parser(&source, &builder);
    bool ok = parser.parsePathDataFromSource(parsingMode);
    result.shrinkToFit();
    return ok;
}

bool addToSVGPathByteStream(SVGPathByteStream& fromStream, const SVGPathByteStream& byStream, unsigned repeatCount)
{
    if (fromStream.isEmpty() || byStream.isEmpty())
        return true;

    OwnPtr<SVGPathByteStream> fromStreamCopy = fromStream.copy();
    fromStream.clear();

    SVGPathByteStreamBuilder builder(fromStream);
    SVGPathByteStreamSource fromSource(*fromStreamCopy);
    SVGPathByteStreamSource bySource(byStream);
    SVGPathBlender blender(&fromSource, &bySource, &builder);
    return blender.addAnimatedPath(repeatCount);
}

unsigned getSVGPathSegAtLengthFromSVGPathByteStream(const SVGPathByteStream& stream, float length)
{
    if (stream.isEmpty())
        return 0;

    SVGPathTraversalStateBuilder builder(PathTraversalState::TraversalSegmentAtLength, length);
    SVGPathByteStreamSource source(stream);
    SVGPathParser parser(&source, &builder);
    parser.parsePathDataFromSource(NormalizedParsing);
    return builder.pathSegmentIndex();
}

float getTotalLengthOfSVGPathByteStream(const SVGPathByteStream& stream)
{
    if (stream.isEmpty())
        return 0;

    SVGPathTraversalStateBuilder builder(PathTraversalState::TraversalTotalLength);
    SVGPathByteStreamSource source(stream);
    SVGPathParser parser(&source, &builder);
    parser.parsePathDataFromSource(NormalizedParsing);
    return builder.totalLength();
}

FloatPoint getPointAtLengthOfSVGPathByteStream(const SVGPathByteStream& stream, float length)
{
    if (stream.isEmpty())
        return FloatPoint();

    SVGPathTraversalStateBuilder builder(PathTraversalState::TraversalPointAtLength, length);
    SVGPathByteStreamSource source(stream);
    SVGPathParser parser(&source, &builder);
    parser.parsePathDataFromSource(NormalizedParsing);
    return builder.currentPoint();
}

}