third_party/WebKit/Source/core/svg/SVGPathByteStreamSource.h

   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/svg/SVGPathByteStream.h"
  24 #include "core/svg/SVGPathSource.h"
  25 #include "platform/geometry/FloatPoint.h"
  26
  27 namespace blink {
  28
  29 class SVGPathByteStreamSource final : public SVGPathSource {
  30 public:
  31     explicit SVGPathByteStreamSource(const SVGPathByteStream& stream)
  32         : m_streamCurrent(stream.begin())
  33         , m_streamEnd(stream.end())
  34     {
  35     }
  36
  37 private:
  38     bool hasMoreData() const override;
  39     SVGPathSegType peekSegmentType() override;
  40     PathSegmentData parseSegment() override;
  41
  42 #if COMPILER(MSVC)
  43 #pragma warning(disable: 4701)
  44 #endif
  45     template<typename DataType>
  46     DataType readType()
  47     {
  48         ByteType<DataType> data;
  49         size_t typeSize = sizeof(ByteType<DataType>);
  50         ASSERT(m_streamCurrent + typeSize <= m_streamEnd);
  51         memcpy(data.bytes, m_streamCurrent, typeSize);
  52         m_streamCurrent += typeSize;
  53         return data.value;
  54     }
  55
  56     bool readFlag() { return readType<bool>(); }
  57     float readFloat() { return readType<float>(); }
  58     unsigned short readSVGSegmentType() { return readType<unsigned short>(); }
  59     FloatPoint readFloatPoint()
  60     {
  61         float x = readType<float>();
  62         float y = readType<float>();
  63         return FloatPoint(x, y);
  64     }
  65
  66     SVGPathByteStream::DataIterator m_streamCurrent;
  67     SVGPathByteStream::DataIterator m_streamEnd;
  68 };
  69
  70 } // namespace blink
  71
  72 #endif // SVGPathByteStreamSource_h