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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 #include "core/platform/graphics/FloatPoint.h"
     24 #include "core/svg/SVGPathByteStream.h"
     25 #include "core/svg/SVGPathSource.h"
     26 #include "wtf/PassOwnPtr.h"
     27 
     28 namespace WebCore {
     29 
     30 class SVGPathByteStreamSource : public SVGPathSource {
     31 public:
     32     static PassOwnPtr<SVGPathByteStreamSource> create(SVGPathByteStream* stream)
     33     {
     34         return adoptPtr(new SVGPathByteStreamSource(stream));
     35     }
     36 
     37 private:
     38     SVGPathByteStreamSource(SVGPathByteStream*);
     39 
     40     virtual bool hasMoreData() const;
     41     virtual bool moveToNextToken() { return true; }
     42     virtual bool parseSVGSegmentType(SVGPathSegType&);
     43     virtual SVGPathSegType nextCommand(SVGPathSegType);
     44 
     45     virtual bool parseMoveToSegment(FloatPoint&);
     46     virtual bool parseLineToSegment(FloatPoint&);
     47     virtual bool parseLineToHorizontalSegment(float&);
     48     virtual bool parseLineToVerticalSegment(float&);
     49     virtual bool parseCurveToCubicSegment(FloatPoint&, FloatPoint&, FloatPoint&);
     50     virtual bool parseCurveToCubicSmoothSegment(FloatPoint&, FloatPoint&);
     51     virtual bool parseCurveToQuadraticSegment(FloatPoint&, FloatPoint&);
     52     virtual bool parseCurveToQuadraticSmoothSegment(FloatPoint&);
     53     virtual bool parseArcToSegment(float&, float&, float&, bool&, bool&, FloatPoint&);
     54 
     55 #if COMPILER(MSVC)
     56 #pragma warning(disable: 4701)
     57 #endif
     58     template<typename DataType, typename ByteType>
     59     DataType readType()
     60     {
     61         ByteType data;
     62         size_t typeSize = sizeof(ByteType);
     63 
     64         for (size_t i = 0; i < typeSize; ++i) {
     65             ASSERT(m_streamCurrent < m_streamEnd);
     66             data.bytes[i] = *m_streamCurrent;
     67             ++m_streamCurrent;
     68         }
     69 
     70         return data.value;
     71     }
     72 
     73     bool readFlag()
     74     {
     75         return readType<bool, BoolByte>();
     76     }
     77 
     78     float readFloat()
     79     {
     80         return readType<float, FloatByte>();
     81     }
     82 
     83     unsigned short readSVGSegmentType()
     84     {
     85         return readType<unsigned short, UnsignedShortByte>();
     86     }
     87 
     88     FloatPoint readFloatPoint()
     89     {
     90         float x = readType<float, FloatByte>();
     91         float y = readType<float, FloatByte>();
     92         return FloatPoint(x, y);
     93     }
     94 
     95     SVGPathByteStream::DataIterator m_streamCurrent;
     96     SVGPathByteStream::DataIterator m_streamEnd;
     97 };
     98 
     99 } // namespace WebCore
    100 
    101 #endif // SVGPathByteStreamSource_h
    102