src/common/imaggif.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/common/imaggif.cpp
   3 // Purpose:     wxGIFHandler
   4 // Author:      Vaclav Slavik & Guillermo Rodriguez Garcia
   5 // RCS-ID:      $Id$
   6 // Copyright:   (c) 1999 Vaclav Slavik & Guillermo Rodriguez Garcia
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10 // For compilers that support precompilation, includes "wx.h".
  11 #include "wx/wxprec.h"
  12
  13 #ifdef __BORLANDC__
  14     #pragma hdrstop
  15 #endif
  16
  17 #if wxUSE_IMAGE && wxUSE_GIF
  18
  19 #ifndef WX_PRECOMP
  20     #include "wx/intl.h"
  21     #include "wx/log.h"
  22 #endif
  23
  24 #include "wx/imaggif.h"
  25 #include "wx/gifdecod.h"
  26 #include "wx/wfstream.h"
  27
  28 IMPLEMENT_DYNAMIC_CLASS(wxGIFHandler,wxImageHandler)
  29
  30 //-----------------------------------------------------------------------------
  31 // wxGIFHandler
  32 //-----------------------------------------------------------------------------
  33
  34 #if wxUSE_STREAMS
  35
  36 bool wxGIFHandler::LoadFile(wxImage *image, wxInputStream& stream,
  37                             bool verbose, int index)
  38 {
  39     wxGIFDecoder *decod;
  40     wxGIFErrorCode error;
  41     bool ok = true;
  42
  43 //    image->Destroy();
  44     decod = new wxGIFDecoder();
  45     error = decod->LoadGIF(stream);
  46
  47     if ((error != wxGIF_OK) && (error != wxGIF_TRUNCATED))
  48     {
  49         if (verbose)
  50         {
  51             switch (error)
  52             {
  53                 case wxGIF_INVFORMAT:
  54                     wxLogError(_("GIF: error in GIF image format."));
  55                     break;
  56                 case wxGIF_MEMERR:
  57                     wxLogError(_("GIF: not enough memory."));
  58                     break;
  59                 default:
  60                     wxLogError(_("GIF: unknown error!!!"));
  61                     break;
  62             }
  63         }
  64         delete decod;
  65         return false;
  66     }
  67
  68     if ((error == wxGIF_TRUNCATED) && verbose)
  69     {
  70         wxLogError(_("GIF: data stream seems to be truncated."));
  71         /* go on; image data is OK */
  72     }
  73
  74     if (ok)
  75     {
  76         ok = decod->ConvertToImage(index != -1 ? (size_t)index : 0, image);
  77     }
  78     else
  79     {
  80         wxLogError(_("GIF: Invalid gif index."));
  81     }
  82
  83     delete decod;
  84
  85     return ok;
  86 }
  87
  88 bool wxGIFHandler::SaveFile( wxImage * WXUNUSED(image),
  89                              wxOutputStream& WXUNUSED(stream), bool verbose )
  90 {
  91     if (verbose)
  92     {
  93         wxLogDebug(wxT("GIF: the handler is read-only!!"));
  94     }
  95
  96     return false;
  97 }
  98
  99 bool wxGIFHandler::DoCanRead( wxInputStream& stream )
 100 {
 101     wxGIFDecoder decod;
 102     return decod.CanRead(stream);
 103          // it's ok to modify the stream position here
 104 }
 105
 106 int wxGIFHandler::DoGetImageCount( wxInputStream& stream )
 107 {
 108     wxGIFDecoder decod;
 109     wxGIFErrorCode error = decod.LoadGIF(stream);
 110     if ( (error != wxGIF_OK) && (error != wxGIF_TRUNCATED) )
 111         return -1;
 112
 113     // NOTE: this function modifies the current stream position but it's ok
 114     //       (see wxImageHandler::GetImageCount)
 115
 116     return decod.GetFrameCount();
 117 }
 118
 119 #endif  // wxUSE_STREAMS
 120
 121 #endif  // wxUSE_GIF