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 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  11 #pragma implementation "imagpnm.h"
  12 #endif
  13
  14 // For compilers that support precompilation, includes "wx.h".
  15 #include "wx/wxprec.h"
  16
  17 #ifdef __BORLANDC__
  18 #pragma hdrstop
  19 #endif
  20
  21 #ifndef WX_PRECOMP
  22 #  include "wx/setup.h"
  23 #endif
  24
  25 #if wxUSE_IMAGE && wxUSE_PNM
  26
  27 #include "wx/imagpnm.h"
  28 #include "wx/log.h"
  29 #include "wx/intl.h"
  30 #include "wx/txtstrm.h"
  31
  32 //-----------------------------------------------------------------------------
  33 // wxBMPHandler
  34 //-----------------------------------------------------------------------------
  35
  36 IMPLEMENT_DYNAMIC_CLASS(wxPNMHandler,wxImageHandler)
  37
  38 #if wxUSE_STREAMS
  39
  40 void Skip_Comment(wxInputStream &stream)
  41 {
  42     wxTextInputStream text_stream(stream);
  43
  44     if (stream.Peek()==wxT('#'))
  45     {
  46         text_stream.ReadLine();
  47         Skip_Comment(stream);
  48     }
  49 }
  50
  51 bool wxPNMHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose, int WXUNUSED(index) )
  52 {
  53     wxUint32  width, height;
  54     wxUint16  maxval;
  55     char      c(0);
  56
  57     image->Destroy();
  58
  59     /*
  60      * Read the PNM header
  61      */
  62
  63     wxBufferedInputStream buf_stream(stream);
  64     wxTextInputStream text_stream(buf_stream);
  65
  66     Skip_Comment(buf_stream);
  67     if (buf_stream.GetC()==wxT('P')) c=buf_stream.GetC();
  68
  69     switch (c)
  70     {
  71         case wxT('2'):
  72             if (verbose) wxLogError(_("Loading Grey Ascii PNM image is not yet implemented."));
  73             return false;
  74         case wxT('5'):
  75             if (verbose) wxLogError(_("Loading Grey Raw PNM image is not yet implemented."));
  76             return false;
  77         case wxT('3'):
  78         case wxT('6'): break;
  79         default:
  80             if (verbose) wxLogError(_("PNM: File format is not recognized."));
  81             return false;
  82     }
  83
  84     text_stream.ReadLine(); // for the \n
  85     Skip_Comment(buf_stream);
  86     text_stream >> width >> height ;
  87     Skip_Comment(buf_stream);
  88     text_stream >> maxval;
  89
  90     //cout << line << " " << width << " " << height << " " << maxval << endl;
  91     image->Create( width, height );
  92     unsigned char *ptr = image->GetData();
  93     if (!ptr)
  94     {
  95         if (verbose)
  96            wxLogError( _("PNM: Couldn't allocate memory.") );
  97         return false;
  98     }
  99
 100    if (c=='3') // Ascii RBG
 101       {
 102         wxUint32 value, size=3*width*height;
 103         for (wxUint32 i=0; i<size; ++i)
 104           {
 105             //this is very slow !!!
 106             //I wonder how we can make any better ?
 107             value=text_stream.Read32();
 108             *ptr++=(unsigned char)value;
 109
 110             if ( !buf_stream )
 111               {
 112                 if (verbose) wxLogError(_("PNM: File seems truncated."));
 113                 return false;
 114               }
 115           }
 116       }
 117     if (c=='6') // Raw RGB
 118       buf_stream.Read( ptr, 3*width*height );
 119
 120     image->SetMask( false );
 121
 122     const wxStreamError err = buf_stream.GetLastError();
 123     return err == wxSTREAM_NO_ERROR || err == 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 << wxT("P6\n") << image->GetWidth() << wxT(" ") << image->GetHeight() << wxT("\n255\n");
 134     stream.Write(image->GetData(),3*image->GetWidth()*image->GetHeight());
 135
 136     return stream.IsOk();
 137 }
 138
 139 bool wxPNMHandler::DoCanRead( wxInputStream& stream )
 140 {
 141     Skip_Comment(stream);
 142
 143     if ( stream.GetC() == 'P' )
 144     {
 145         switch (stream.GetC())
 146         {
 147             case '3':
 148             case '6':
 149                 return true;
 150         }
 151     }
 152
 153     return false;
 154 }
 155
 156
 157 #endif // wxUSE_STREAMS
 158
 159 #endif // wxUSE_PNM