src/common/imaggif.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        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 #ifdef __GNUG__
  11 #pragma implementation "imaggif.h"
  12 #endif
  13
  14 // For compilers that support precompilation, includes "wx.h".
  15 #include "wx/wxprec.h"
  16
  17 #ifdef __BORLANDC__
  18 #  pragma hdrstop
  19 #endif
  20
  21 #ifndef WX_PRECOMP
  22 #  include "wx/defs.h"
  23 #endif
  24
  25 #if wxUSE_GIF
  26
  27 #include "wx/imaggif.h"
  28 #include "wx/gifdecod.h"
  29 #include "wx/wfstream.h"
  30 #include "wx/log.h"
  31 #include "wx/intl.h"
  32
  33 IMPLEMENT_DYNAMIC_CLASS(wxGIFHandler,wxImageHandler)
  34
  35 //-----------------------------------------------------------------------------
  36 // wxGIFHandler
  37 //-----------------------------------------------------------------------------
  38
  39 #if wxUSE_STREAMS
  40
  41 bool wxGIFHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose, int WXUNUSED(index) )
  42 {
  43     wxGIFDecoder *decod;
  44     int error;
  45     bool ok;
  46
  47     decod = new wxGIFDecoder(&stream, TRUE);
  48     error = decod->ReadGIF();
  49
  50     if ((error != wxGIF_OK) && (error != wxGIF_TRUNCATED))
  51     {
  52         if (verbose)
  53         {
  54             switch (error)
  55             {
  56                 case wxGIF_INVFORMAT:
  57                     wxLogError(_("wxGIFHandler: error in GIF image format."));
  58                     break;
  59                 case wxGIF_MEMERR:
  60                     wxLogError(_("wxGIFHandler: not enough memory."));
  61                     break;
  62                 default:
  63                     wxLogError(_("wxGIFHandler: unknown error!!!"));
  64                     break;
  65             }
  66         }
  67         delete decod;
  68         return FALSE;
  69     }
  70
  71     if ((error == wxGIF_TRUNCATED) && verbose)
  72     {
  73         wxLogWarning(_("wxGIFHandler: data stream seems to be truncated."));
  74         /* go on; image data is OK */
  75     }
  76
  77     image->Destroy();
  78     ok = decod->ConvertToImage(image);
  79
  80     delete decod;
  81     return ok;
  82 }
  83
  84 bool wxGIFHandler::SaveFile( wxImage * WXUNUSED(image),
  85                              wxOutputStream& WXUNUSED(stream), bool verbose )
  86 {
  87     if (verbose)
  88         wxLogDebug(wxT("wxGIFHandler is read-only!!"));
  89
  90     return FALSE;
  91 }
  92
  93 bool wxGIFHandler::DoCanRead( wxInputStream& stream )
  94 {
  95     wxGIFDecoder *decod;
  96     bool ok;
  97
  98     decod = new wxGIFDecoder(&stream);
  99     ok = decod->CanRead();
 100
 101     delete decod;
 102     return ok;
 103 }
 104
 105 #endif  // wxUSE_STREAMS
 106
 107 #endif  // wxUSE_GIF