root/Source/core/svg/SVGPathUtilities.cpp

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DEFINITIONS

This source file includes following definitions.
  1. globalSVGPathBuilder
  2. globalSVGPathByteStreamBuilder
  3. globalSVGPathStringBuilder
  4. globalSVGPathTraversalStateBuilder
  5. globalSVGPathParser
  6. globalSVGPathBlender
  7. buildPathFromString
  8. buildPathFromByteStream
  9. buildStringFromByteStream
  10. buildSVGPathByteStreamFromString
  11. addToSVGPathByteStream
  12. getSVGPathSegAtLengthFromSVGPathByteStream
  13. getTotalLengthOfSVGPathByteStream
  14. getPointAtLengthOfSVGPathByteStream

/*
 * 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/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 WebCore {

static SVGPathBuilder* globalSVGPathBuilder(Path& result)
{
    static SVGPathBuilder* s_builder = 0;
    if (!s_builder)
        s_builder = new SVGPathBuilder;

    s_builder->setCurrentPath(&result);
    return s_builder;
}

static SVGPathByteStreamBuilder* globalSVGPathByteStreamBuilder(SVGPathByteStream* result)
{
    static SVGPathByteStreamBuilder* s_builder = 0;
    if (!s_builder)
        s_builder = new SVGPathByteStreamBuilder;

    s_builder->setCurrentByteStream(result);
    return s_builder;
}

static SVGPathStringBuilder* globalSVGPathStringBuilder()
{
    static SVGPathStringBuilder* s_builder = 0;
    if (!s_builder)
        s_builder = new SVGPathStringBuilder;

    return s_builder;
}

static SVGPathTraversalStateBuilder* globalSVGPathTraversalStateBuilder(PathTraversalState& traversalState, float length)
{
    static SVGPathTraversalStateBuilder* s_builder = 0;
    if (!s_builder)
        s_builder = new SVGPathTraversalStateBuilder;

    s_builder->setCurrentTraversalState(&traversalState);
    s_builder->setDesiredLength(length);
    return s_builder;
}

static SVGPathParser* globalSVGPathParser(SVGPathSource* source, SVGPathConsumer* consumer)
{
    static SVGPathParser* s_parser = 0;
    if (!s_parser)
        s_parser = new SVGPathParser;

    s_parser->setCurrentSource(source);
    s_parser->setCurrentConsumer(consumer);
    return s_parser;
}

static SVGPathBlender* globalSVGPathBlender()
{
    static SVGPathBlender* s_blender = 0;
    if (!s_blender)
        s_blender = new SVGPathBlender;

    return s_blender;
}

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

    SVGPathBuilder* builder = globalSVGPathBuilder(result);

    OwnPtr<SVGPathStringSource> source = SVGPathStringSource::create(d);
    SVGPathParser* parser = globalSVGPathParser(source.get(), builder);
    bool ok = parser->parsePathDataFromSource(NormalizedParsing);
    parser->cleanup();
    return ok;
}

bool buildPathFromByteStream(const SVGPathByteStream* stream, Path& result)
{
    ASSERT(stream);
    if (stream->isEmpty())
        return false;

    SVGPathBuilder* builder = globalSVGPathBuilder(result);

    SVGPathByteStreamSource source(stream);
    SVGPathParser* parser = globalSVGPathParser(&source, builder);
    bool ok = parser->parsePathDataFromSource(NormalizedParsing);
    parser->cleanup();
    return ok;
}

bool buildStringFromByteStream(const SVGPathByteStream* stream, String& result, PathParsingMode parsingMode)
{
    ASSERT(stream);
    if (stream->isEmpty())
        return false;

    SVGPathStringBuilder* builder = globalSVGPathStringBuilder();

    SVGPathByteStreamSource source(stream);
    SVGPathParser* parser = globalSVGPathParser(&source, builder);
    bool ok = parser->parsePathDataFromSource(parsingMode);
    result = builder->result();
    parser->cleanup();
    return ok;
}

bool buildSVGPathByteStreamFromString(const String& d, SVGPathByteStream* result, PathParsingMode parsingMode)
{
    ASSERT(result);
    result->clear();
    if (d.isEmpty())
        return false;

    // 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 = globalSVGPathByteStreamBuilder(result);

    OwnPtr<SVGPathStringSource> source = SVGPathStringSource::create(d);
    SVGPathParser* parser = globalSVGPathParser(source.get(), builder);
    bool ok = parser->parsePathDataFromSource(parsingMode);
    parser->cleanup();

    result->shrinkToFit();

    return ok;
}

bool addToSVGPathByteStream(SVGPathByteStream* fromStream, const SVGPathByteStream* byStream, unsigned repeatCount)
{
    ASSERT(fromStream);
    ASSERT(byStream);
    if (fromStream->isEmpty() || byStream->isEmpty())
        return false;

    SVGPathByteStreamBuilder* builder = globalSVGPathByteStreamBuilder(fromStream);

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

    SVGPathByteStreamSource fromSource(fromStreamCopy.get());
    SVGPathByteStreamSource bySource(byStream);
    SVGPathBlender* blender = globalSVGPathBlender();
    bool ok = blender->addAnimatedPath(&fromSource, &bySource, builder, repeatCount);
    blender->cleanup();
    return ok;
}

bool getSVGPathSegAtLengthFromSVGPathByteStream(const SVGPathByteStream* stream, float length, unsigned& pathSeg)
{
    ASSERT(stream);
    if (stream->isEmpty())
        return false;

    PathTraversalState traversalState(PathTraversalState::TraversalSegmentAtLength);
    SVGPathTraversalStateBuilder* builder = globalSVGPathTraversalStateBuilder(traversalState, length);

    SVGPathByteStreamSource source(stream);
    SVGPathParser* parser = globalSVGPathParser(&source, builder);
    bool ok = parser->parsePathDataFromSource(NormalizedParsing);
    pathSeg = builder->pathSegmentIndex();
    parser->cleanup();
    return ok;
}

bool getTotalLengthOfSVGPathByteStream(const SVGPathByteStream* stream, float& totalLength)
{
    ASSERT(stream);
    if (stream->isEmpty())
        return false;

    PathTraversalState traversalState(PathTraversalState::TraversalTotalLength);
    SVGPathTraversalStateBuilder* builder = globalSVGPathTraversalStateBuilder(traversalState, 0);

    SVGPathByteStreamSource source(stream);
    SVGPathParser* parser = globalSVGPathParser(&source, builder);
    bool ok = parser->parsePathDataFromSource(NormalizedParsing);
    totalLength = builder->totalLength();
    parser->cleanup();
    return ok;
}

bool getPointAtLengthOfSVGPathByteStream(const SVGPathByteStream* stream, float length, FloatPoint& point)
{
    ASSERT(stream);
    if (stream->isEmpty())
        return false;

    PathTraversalState traversalState(PathTraversalState::TraversalPointAtLength);
    SVGPathTraversalStateBuilder* builder = globalSVGPathTraversalStateBuilder(traversalState, length);

    SVGPathByteStreamSource source(stream);
    SVGPathParser* parser = globalSVGPathParser(&source, builder);
    bool ok = parser->parsePathDataFromSource(NormalizedParsing);
    point = builder->currentPoint();
    parser->cleanup();
    return ok;
}

}

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