src/common/imagpnm.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        imagpnm.cpp
   3 // Purpose:     wxImage PNM handler
   4 // Author:      Sylvain Bougnoux
   5 // RCS-ID:      $Id$
   6 // Copyright:   (c) Sylvain Bougnoux
   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/setup.h"
  24 #endif
  25
  26 #if wxUSE_PNM
  27
  28 #include "wx/image.h"
  29 #include "wx/log.h"
  30 #include "wx/intl.h"
  31 #include "wx/txtstrm.h"
  32
  33 //-----------------------------------------------------------------------------
  34 // wxBMPHandler
  35 //-----------------------------------------------------------------------------
  36
  37 IMPLEMENT_DYNAMIC_CLASS(wxPNMHandler,wxImageHandler)
  38
  39 #if wxUSE_STREAMS
  40
  41 void Skip_Comment(wxInputStream &stream)
  42 {
  43   wxTextInputStream text_stream(stream);
  44
  45   if (stream.Peek()==wxT('#'))
  46     {
  47       text_stream.ReadLine();
  48       Skip_Comment(stream);
  49     }
  50 }
  51
  52 bool wxPNMHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose, int WXUNUSED(index) )
  53 {
  54     wxUint32  width, height;
  55     wxUint16  maxval;
  56     char      c(0);
  57
  58     image->Destroy();
  59
  60     /*
  61      * Read the PNM header
  62      */
  63
  64     wxBufferedInputStream buf_stream(stream);
  65     wxTextInputStream text_stream(buf_stream);
  66
  67     Skip_Comment(buf_stream);
  68     if (buf_stream.GetC()==wxT('P')) c=buf_stream.GetC();
  69
  70     switch (c)
  71     {
  72         case wxT('2'):
  73             if (verbose) wxLogError(_("Loading Grey Ascii PNM image is not yet implemented."));
  74             return FALSE;
  75         case wxT('5'):
  76             if (verbose) wxLogError(_("Loading Grey Raw PNM image is not yet implemented."));
  77             return FALSE;
  78         case wxT('3'):
  79         case wxT('6'): break;
  80         default:
  81             if (verbose) wxLogError(_("PNM: File format is not recognized."));
  82             return FALSE;
  83     }
  84
  85     text_stream.ReadLine(); // for the \n
  86     Skip_Comment(buf_stream);
  87     text_stream >> width >> height ;
  88     Skip_Comment(buf_stream);
  89     text_stream >> maxval;
  90
  91     //cout << line << " " << width << " " << height << " " << maxval << endl;
  92     image->Create( width, height );
  93     unsigned char *ptr = image->GetData();
  94     if (!ptr)
  95     {
  96         if (verbose)
  97            wxLogError( _("PNM: Couldn't allocate memory.") );
  98         return FALSE;
  99     }
 100
 101    if (c=='3') // Ascii RBG
 102       {
 103         wxUint32 value, size=3*width*height;
 104         for (wxUint32 i=0; i<size; ++i)
 105           {
 106             //this is very slow !!!
 107             //I wonder how we can make any better ?
 108             value=text_stream.Read32();
 109             *ptr++=(unsigned char)value;
 110
 111             if (buf_stream.LastError()!=wxSTREAM_NOERROR)
 112               {
 113                 if (verbose) wxLogError(_("PNM: File seems truncated."));
 114                 return FALSE;
 115               }
 116           }
 117       }
 118     if (c=='6') // Raw RGB
 119       buf_stream.Read( ptr, 3*width*height );
 120
 121     image->SetMask( FALSE );
 122
 123     return (buf_stream.LastError()==wxStream_NOERROR || buf_stream.LastError()==wxStream_EOF);
 124 }
 125
 126 bool wxPNMHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool WXUNUSED(verbose) )
 127 {
 128     wxTextOutputStream text_stream(stream);
 129
 130     //text_stream << "P6" << endl
 131     //<< image->GetWidth() << " " << image->GetHeight() << endl
 132     //<< "255" << endl;
 133     text_stream << "P6\n" << image->GetWidth() << " " << image->GetHeight() << "\n255\n";
 134     stream.Write(image->GetData(),3*image->GetWidth()*image->GetHeight());
 135
 136     return (stream.LastError()==wxStream_NOERROR);
 137 }
 138
 139 bool wxPNMHandler::DoCanRead( wxInputStream& stream )
 140 {
 141     off_t pos = stream.TellI();
 142
 143     Skip_Comment(stream);
 144
 145     if ( stream.GetC() == 'P' )
 146     {
 147         switch (stream.GetC())
 148         {
 149             case '3':
 150             case '6':
 151                 stream.SeekI(pos);
 152                 return TRUE;
 153         }
 154     }
 155
 156     stream.SeekI(pos);
 157     return FALSE;
 158 }
 159
 160
 161 #endif // wxUSE_STREAMS
 162
 163 #endif // wxUSE_PNM