utilities/CxImage/ximajas.h

   1 /*
   2  * File:        ximajas.h
   3  * Purpose:     Jasper Image Class Loader and Writer
   4  */
   5 /* ==========================================================
   6  * CxImageJAS (c) 12/Apr/2003 Davide Pizzolato - www.xdp.it
   7  * For conditions of distribution and use, see copyright notice in ximage.h
   8  *
   9  * based on JasPer Copyright (c) 2001-2003 Michael David Adams - All rights reserved.
  10  * ==========================================================
  11  */
  12 #if !defined(__ximaJAS_h)
  13 #define __ximaJAS_h
  14
  15 #include "ximage.h"
  16
  17 #if CXIMAGE_SUPPORT_JASPER
  18
  19 #include "../jasper/include/jasper/jasper.h"
  20
  21 class CxImageJAS: public CxImage
  22 {
  23 public:
  24         CxImageJAS(): CxImage((DWORD)0) {}      // <vho> cast to DWORD
  25
  26 //      bool Load(const TCHAR * imageFileName){ return CxImage::Load(imageFileName,0);}
  27 //      bool Save(const TCHAR * imageFileName){ return CxImage::Save(imageFileName,0);}
  28         bool Decode(CxFile * hFile, DWORD imagetype = 0);
  29         bool Decode(FILE *hFile, DWORD imagetype = 0) { CxIOFile file(hFile); return Decode(&file,imagetype); }
  30
  31 #if CXIMAGE_SUPPORT_ENCODE
  32         bool Encode(CxFile * hFile, DWORD imagetype = 0);
  33         bool Encode(FILE *hFile, DWORD imagetype = 0) { CxIOFile file(hFile); return Encode(&file,imagetype); }
  34 #endif // CXIMAGE_SUPPORT_ENCODE
  35 protected:
  36
  37         class CxFileJas
  38         {
  39         public:
  40                 CxFileJas(CxFile* pFile,jas_stream_t *stream)
  41                 {
  42                         if (stream->obj_) jas_free(stream->obj_);
  43                         stream->obj_ = pFile;
  44
  45                         // <vho> - cannot set the stream->ops_->functions here,
  46                         // because this overwrites a static structure in the Jasper library.
  47                         // This structure is used by Jasper for internal operations too, e.g. tempfile.
  48                         // However the ops_ pointer in the stream can be overwritten.
  49
  50                         //stream->ops_->close_ = JasClose;
  51                         //stream->ops_->read_  = JasRead;
  52                         //stream->ops_->seek_  = JasSeek;
  53                         //stream->ops_->write_ = JasWrite;
  54
  55                         jas_stream_CxFile.close_ = JasClose;
  56                         jas_stream_CxFile.read_  = JasRead;
  57                         jas_stream_CxFile.seek_  = JasSeek;
  58                         jas_stream_CxFile.write_ = JasWrite;
  59
  60                         stream->ops_ = &jas_stream_CxFile;
  61
  62                         // <vho> - end
  63                 }
  64                 static int JasRead(jas_stream_obj_t *obj, char *buf, int cnt)
  65                 {               return ((CxFile*)obj)->Read(buf,1,cnt); }
  66                 static int JasWrite(jas_stream_obj_t *obj, char *buf, int cnt)
  67                 {               return ((CxFile*)obj)->Write(buf,1,cnt); }
  68                 static long JasSeek(jas_stream_obj_t *obj, long offset, int origin)
  69                 {               return ((CxFile*)obj)->Seek(offset,origin); }
  70                 static int JasClose(jas_stream_obj_t * /*obj*/)
  71                 {               return 1; }
  72
  73         // <vho>
  74 private:
  75                 jas_stream_ops_t jas_stream_CxFile;
  76         // <vho> - end
  77
  78         };
  79
  80 };
  81
  82 #endif
  83
  84 #endif