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      1 /*
      2  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
      3  *
      4  * This library is free software; you can redistribute it and/or
      5  * modify it under the terms of the GNU Library General Public
      6  * License as published by the Free Software Foundation; either
      7  * version 2 of the License, or (at your option) any later version.
      8  *
      9  * This library is distributed in the hope that it will be useful,
     10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     12  * Library General Public License for more details.
     13  *
     14  * You should have received a copy of the GNU Library General Public License
     15  * along with this library; see the file COPYING.LIB.  If not, write to
     16  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     17  * Boston, MA 02110-1301, USA.
     18  */
     19 
     20 #ifndef SVGPathByteStreamSource_h
     21 #define SVGPathByteStreamSource_h
     22 
     23 #if ENABLE(SVG)
     24 #include "FloatPoint.h"
     25 #include "SVGPathByteStream.h"
     26 #include "SVGPathSource.h"
     27 #include <wtf/PassOwnPtr.h>
     28 
     29 namespace WebCore {
     30 
     31 class SVGPathByteStreamSource : public SVGPathSource {
     32 public:
     33     static PassOwnPtr<SVGPathByteStreamSource> create(SVGPathByteStream* stream)
     34     {
     35         return adoptPtr(new SVGPathByteStreamSource(stream));
     36     }
     37 
     38 private:
     39     SVGPathByteStreamSource(SVGPathByteStream*);
     40 
     41     virtual bool hasMoreData() const;
     42     virtual bool moveToNextToken() { return true; }
     43     virtual bool parseSVGSegmentType(SVGPathSegType&);
     44     virtual SVGPathSegType nextCommand(SVGPathSegType);
     45 
     46     virtual bool parseMoveToSegment(FloatPoint&);
     47     virtual bool parseLineToSegment(FloatPoint&);
     48     virtual bool parseLineToHorizontalSegment(float&);
     49     virtual bool parseLineToVerticalSegment(float&);
     50     virtual bool parseCurveToCubicSegment(FloatPoint&, FloatPoint&, FloatPoint&);
     51     virtual bool parseCurveToCubicSmoothSegment(FloatPoint&, FloatPoint&);
     52     virtual bool parseCurveToQuadraticSegment(FloatPoint&, FloatPoint&);
     53     virtual bool parseCurveToQuadraticSmoothSegment(FloatPoint&);
     54     virtual bool parseArcToSegment(float&, float&, float&, bool&, bool&, FloatPoint&);
     55 
     56 #if COMPILER(MSVC)
     57 #pragma warning(disable: 4701)
     58 #endif
     59     template<typename DataType, typename ByteType>
     60     DataType readType()
     61     {
     62         ByteType data;
     63         size_t typeSize = sizeof(ByteType);
     64 
     65         for (size_t i = 0; i < typeSize; ++i) {
     66             ASSERT(m_streamCurrent < m_streamEnd);
     67             data.bytes[i] = *m_streamCurrent;
     68             ++m_streamCurrent;
     69         }
     70 
     71         return data.value;
     72     }
     73 
     74     bool readFlag()
     75     {
     76         return readType<bool, BoolByte>();
     77     }
     78 
     79     float readFloat()
     80     {
     81         return readType<float, FloatByte>();
     82     }
     83 
     84     unsigned short readSVGSegmentType()
     85     {
     86         return readType<unsigned short, UnsignedShortByte>();
     87     }
     88 
     89     FloatPoint readFloatPoint()
     90     {
     91         float x = readType<float, FloatByte>();
     92         float y = readType<float, FloatByte>();
     93         return FloatPoint(x, y);
     94     }
     95 
     96     SVGPathByteStream* m_stream;
     97     SVGPathByteStream::DataIterator m_streamCurrent;
     98     SVGPathByteStream::DataIterator m_streamEnd;
     99 };
    100 
    101 } // namespace WebCore
    102 
    103 #endif // ENABLE(SVG)
    104 #endif // SVGPathByteStreamSource_h
    105