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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 SVGPathByteStreamBuilder_h
     21 #define SVGPathByteStreamBuilder_h
     22 
     23 #if ENABLE(SVG)
     24 #include "FloatPoint.h"
     25 #include "PlatformString.h"
     26 #include "SVGPathByteStream.h"
     27 #include "SVGPathConsumer.h"
     28 #include <wtf/PassOwnPtr.h>
     29 
     30 namespace WebCore {
     31 
     32 class SVGPathByteStreamBuilder : public SVGPathConsumer {
     33 public:
     34     SVGPathByteStreamBuilder();
     35 
     36     void setCurrentByteStream(SVGPathByteStream* byteStream) { m_byteStream = byteStream; }
     37 
     38 private:
     39     virtual void incrementPathSegmentCount() { }
     40     virtual bool continueConsuming() { return true; }
     41     virtual void cleanup() { m_byteStream = 0; }
     42 
     43     // Used in UnalteredParsing/NormalizedParsing modes.
     44     virtual void moveTo(const FloatPoint&, bool closed, PathCoordinateMode);
     45     virtual void lineTo(const FloatPoint&, PathCoordinateMode);
     46     virtual void curveToCubic(const FloatPoint&, const FloatPoint&, const FloatPoint&, PathCoordinateMode);
     47     virtual void closePath();
     48 
     49     // Only used in UnalteredParsing mode.
     50     virtual void lineToHorizontal(float, PathCoordinateMode);
     51     virtual void lineToVertical(float, PathCoordinateMode);
     52     virtual void curveToCubicSmooth(const FloatPoint&, const FloatPoint&, PathCoordinateMode);
     53     virtual void curveToQuadratic(const FloatPoint&, const FloatPoint&, PathCoordinateMode);
     54     virtual void curveToQuadraticSmooth(const FloatPoint&, PathCoordinateMode);
     55     virtual void arcTo(float, float, float, bool largeArcFlag, bool sweepFlag, const FloatPoint&, PathCoordinateMode);
     56 
     57     template<typename ByteType>
     58     void writeType(const ByteType& type)
     59     {
     60         size_t typeSize = sizeof(ByteType);
     61         for (size_t i = 0; i < typeSize; ++i)
     62             m_byteStream->append(type.bytes[i]);
     63     }
     64 
     65     void writeFlag(bool value)
     66     {
     67         BoolByte data;
     68         data.value = value;
     69         writeType(data);
     70     }
     71 
     72     void writeFloat(float value)
     73     {
     74         FloatByte data;
     75         data.value = value;
     76         writeType(data);
     77     }
     78 
     79     void writeFloatPoint(const FloatPoint& point)
     80     {
     81         writeFloat(point.x());
     82         writeFloat(point.y());
     83     }
     84 
     85     void writeSegmentType(unsigned short value)
     86     {
     87         UnsignedShortByte data;
     88         data.value = value;
     89         writeType(data);
     90     }
     91 
     92     SVGPathByteStream* m_byteStream;
     93 };
     94 
     95 } // namespace WebCore
     96 
     97 #endif // ENABLE(SVG)
     98 #endif // SVGPathByteStreamBuilder_h
     99