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 /*
  11   We don't put pragma implement in this file because it is already present in
  12   src/common/image.cpp
  13 */
  14
  15 // For compilers that support precompilation, includes "wx.h".
  16 #include "wx/wxprec.h"
  17
  18 #ifdef __BORLANDC__
  19 #  pragma hdrstop
  20 #endif
  21
  22 #ifndef WX_PRECOMP
  23 #  include "wx/defs.h"
  24 #endif
  25
  26 #if wxUSE_GIF
  27
  28 #include "wx/image.h"
  29 #include "wx/gifdecod.h"
  30 #include "wx/wfstream.h"
  31 #include "wx/log.h"
  32 #include "wx/intl.h"
  33
  34 IMPLEMENT_DYNAMIC_CLASS(wxGIFHandler,wxImageHandler)
  35
  36 //-----------------------------------------------------------------------------
  37 // wxGIFHandler
  38 //-----------------------------------------------------------------------------
  39
  40 #if wxUSE_STREAMS
  41
  42 bool wxGIFHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose, int WXUNUSED(index) )
  43 {
  44     wxGIFDecoder *decod;
  45     int error;
  46     bool ok;
  47
  48     decod = new wxGIFDecoder(&stream, TRUE);
  49
  50     if ((error = decod->ReadGIF()) != wxGIF_OK)
  51     {
  52         if (verbose)
  53         {
  54             switch (error)
  55             {
  56                 case wxGIF_INVFORMAT: wxLogError(_("wxGIFHandler: error in GIF image format")); break;
  57                 case wxGIF_MEMERR:    wxLogError(_("wxGIFHandler: couldn't allocate enough memory")); break;
  58                 default:              wxLogError(_("wxGIFHandler: unknown error !!!"));
  59             }
  60         }
  61         delete decod;
  62         return FALSE;
  63     }
  64
  65     image->Destroy();
  66     ok = decod->ConvertToImage(image);
  67
  68     delete decod;
  69     return ok;
  70 }
  71
  72 bool wxGIFHandler::SaveFile( wxImage * WXUNUSED(image),
  73                              wxOutputStream& WXUNUSED(stream), bool verbose )
  74 {
  75     if (verbose)
  76         wxLogDebug(wxT("wxGIFHandler is read-only!!"));
  77
  78     return FALSE;
  79 }
  80
  81 bool wxGIFHandler::DoCanRead( wxInputStream& stream )
  82 {
  83     wxGIFDecoder *decod;
  84     bool ok;
  85
  86     decod = new wxGIFDecoder(&stream);
  87     ok = decod->CanRead();
  88
  89     delete decod;
  90     return ok;
  91 }
  92
  93 #endif  // wxUSE_STREAMS
  94
  95 #endif  // wxUSE_GIF