src/common/imaggif.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        imaggif.cpp
   3 // Purpose:     wxGIFHandler
   4 // Author:      Vaclav Slavik
   5 //              Based on wxGIFDecoder by Guillermo Rodriguez Garcia
   6 // RCS-ID:      $Id$
   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 #include "wx/image.h"
  27 // #include "wx/imaggif.h"
  28 #include "wx/gifdecod.h"
  29 #include "wx/wfstream.h"
  30 #include "wx/module.h"
  31 #include "wx/log.h"
  32
  33 IMPLEMENT_DYNAMIC_CLASS(wxGIFHandler,wxImageHandler)
  34
  35 #if wxUSE_STREAMS
  36
  37 //-----------------------------------------------------------------------------
  38 // wxGIFHandler
  39 //-----------------------------------------------------------------------------
  40
  41 bool wxGIFHandler::LoadFile( wxImage *image, wxInputStream& stream, bool WXUNUSED(verbose) )
  42 {
  43     wxGIFDecoder *decod;
  44     bool ok;
  45
  46     decod = new wxGIFDecoder(&stream, TRUE);
  47
  48     if (decod->ReadGIF() != E_OK)
  49     {
  50         wxLogDebug(_T("Error reading GIF"));
  51         delete decod;
  52         return FALSE;
  53     }
  54
  55     image->Destroy();
  56     ok = decod->ConvertToImage(image);
  57
  58     delete decod;
  59     return ok;
  60 }
  61
  62 bool wxGIFHandler::SaveFile( wxImage * WXUNUSED(image),
  63                              wxOutputStream& WXUNUSED(stream), bool verbose )
  64 {
  65     if (verbose) wxLogDebug(_T("wxGIFHandler is read-only!!"));
  66     return FALSE;
  67 }
  68
  69 bool wxGIFHandler::CanRead( wxInputStream& stream )
  70 {
  71     unsigned char hdr[5];
  72
  73     stream.Read(&hdr, 5);
  74     stream.SeekI(-5, wxFromCurrent);
  75     return (hdr[0] == 'G' && hdr[1] == 'I' && hdr[2] == 'F' && hdr[3] == '8' && hdr[4] == '9');
  76 }
  77
  78 #endif