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_STREAMS && wxUSE_GIF
  27
  28 #include "wx/image.h"
  29 #include "wx/gifdecod.h"
  30 #include "wx/wfstream.h"
  31 #include "wx/log.h"
  32
  33 #if !USE_SHARED_LIBRARIES
  34 IMPLEMENT_DYNAMIC_CLASS(wxGIFHandler,wxImageHandler)
  35 #endif
  36
  37 //-----------------------------------------------------------------------------
  38 // wxGIFHandler
  39 //-----------------------------------------------------------------------------
  40
  41 bool wxGIFHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose )
  42 {
  43     wxGIFDecoder *decod;
  44     int error;
  45     bool ok;
  46
  47     decod = new wxGIFDecoder(&stream, TRUE);
  48
  49     if ((error = decod->ReadGIF()) != E_OK)
  50     {
  51         if (verbose)
  52         {
  53             switch (error)
  54             {
  55                 case E_FORMATO: wxLogError(_T("wxGIFHandler: error in image format")); break;
  56                 case E_MEMORIA: wxLogError(_T("wxGIFHandler: couldn't allocate memory")); break;
  57                 default:        wxLogError(_T("wxGIFHandler: unknown error !!!"));
  58             }
  59         }
  60         delete decod;
  61         return FALSE;
  62     }
  63
  64     image->Destroy();
  65     ok = decod->ConvertToImage(image);
  66
  67     delete decod;
  68     return ok;
  69 }
  70
  71 bool wxGIFHandler::SaveFile( wxImage * WXUNUSED(image),
  72                              wxOutputStream& WXUNUSED(stream), bool verbose )
  73 {
  74     if (verbose)
  75         wxLogDebug(_T("wxGIFHandler is read-only!!"));
  76
  77     return FALSE;
  78 }
  79
  80 bool wxGIFHandler::CanRead( wxInputStream& stream )
  81 {
  82     wxGIFDecoder *decod;
  83     bool ok;
  84
  85     decod = new wxGIFDecoder(&stream);
  86     ok = decod->CanRead();
  87
  88     delete decod;
  89     return ok;
  90 }
  91
  92 #endif  // wxUSE_STREAMS && wxUSE_GIF