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