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 #if !USE_SHARED_LIBRARIES
  35 IMPLEMENT_DYNAMIC_CLASS(wxGIFHandler,wxImageHandler)
  36 #endif
  37
  38 //-----------------------------------------------------------------------------
  39 // wxGIFHandler
  40 //-----------------------------------------------------------------------------
  41
  42 #if wxUSE_STREAMS
  43
  44 bool wxGIFHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose, int WXUNUSED(index) )
  45 {
  46     wxGIFDecoder *decod;
  47     int error;
  48     bool ok;
  49
  50     decod = new wxGIFDecoder(&stream, TRUE);
  51
  52     if ((error = decod->ReadGIF()) != wxGIF_OK)
  53     {
  54         if (verbose)
  55         {
  56             switch (error)
  57             {
  58                 case wxGIF_INVFORMAT: wxLogError(_("wxGIFHandler: error in GIF image format")); break;
  59                 case wxGIF_MEMERR:    wxLogError(_("wxGIFHandler: couldn't allocate enough memory")); break;
  60                 default:              wxLogError(_("wxGIFHandler: unknown error !!!"));
  61             }
  62         }
  63         delete decod;
  64         return FALSE;
  65     }
  66
  67     image->Destroy();
  68     ok = decod->ConvertToImage(image);
  69
  70     delete decod;
  71     return ok;
  72 }
  73
  74 bool wxGIFHandler::SaveFile( wxImage * WXUNUSED(image),
  75                              wxOutputStream& WXUNUSED(stream), bool verbose )
  76 {
  77     if (verbose)
  78         wxLogDebug(wxT("wxGIFHandler is read-only!!"));
  79
  80     return FALSE;
  81 }
  82
  83 bool wxGIFHandler::DoCanRead( wxInputStream& stream )
  84 {
  85     wxGIFDecoder *decod;
  86     bool ok;
  87
  88     decod = new wxGIFDecoder(&stream);
  89     ok = decod->CanRead();
  90
  91     delete decod;
  92     return ok;
  93 }
  94
  95 #endif  // wxUSE_STREAMS
  96
  97 #endif  // wxUSE_GIF