| 1 | ///////////////////////////////////////////////////////////////////////////// |
| 2 | // Name: src/common/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 | // For compilers that support precompilation, includes "wx.h". |
| 11 | #include "wx/wxprec.h" |
| 12 | |
| 13 | #ifdef __BORLANDC__ |
| 14 | #pragma hdrstop |
| 15 | #endif |
| 16 | |
| 17 | #if wxUSE_IMAGE && wxUSE_PNM |
| 18 | |
| 19 | #include "wx/imagpnm.h" |
| 20 | |
| 21 | #ifndef WX_PRECOMP |
| 22 | #include "wx/intl.h" |
| 23 | #include "wx/log.h" |
| 24 | #endif |
| 25 | |
| 26 | #include "wx/txtstrm.h" |
| 27 | |
| 28 | //----------------------------------------------------------------------------- |
| 29 | // wxBMPHandler |
| 30 | //----------------------------------------------------------------------------- |
| 31 | |
| 32 | IMPLEMENT_DYNAMIC_CLASS(wxPNMHandler,wxImageHandler) |
| 33 | |
| 34 | #if wxUSE_STREAMS |
| 35 | |
| 36 | void Skip_Comment(wxInputStream &stream) |
| 37 | { |
| 38 | wxTextInputStream text_stream(stream); |
| 39 | |
| 40 | if (stream.Peek()==wxT('#')) |
| 41 | { |
| 42 | text_stream.ReadLine(); |
| 43 | Skip_Comment(stream); |
| 44 | } |
| 45 | } |
| 46 | |
| 47 | bool wxPNMHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose, int WXUNUSED(index) ) |
| 48 | { |
| 49 | wxUint32 width, height; |
| 50 | wxUint16 maxval; |
| 51 | char c(0); |
| 52 | |
| 53 | image->Destroy(); |
| 54 | |
| 55 | /* |
| 56 | * Read the PNM header |
| 57 | */ |
| 58 | |
| 59 | wxBufferedInputStream buf_stream(stream); |
| 60 | wxTextInputStream text_stream(buf_stream); |
| 61 | |
| 62 | Skip_Comment(buf_stream); |
| 63 | if (buf_stream.GetC()==wxT('P')) c=buf_stream.GetC(); |
| 64 | |
| 65 | switch (c) |
| 66 | { |
| 67 | case wxT('2'): // ASCII Grey |
| 68 | case wxT('3'): // ASCII RGB |
| 69 | case wxT('5'): // RAW Grey |
| 70 | case wxT('6'): break; |
| 71 | default: |
| 72 | if (verbose) wxLogError(_("PNM: File format is not recognized.")); |
| 73 | return false; |
| 74 | } |
| 75 | |
| 76 | text_stream.ReadLine(); // for the \n |
| 77 | Skip_Comment(buf_stream); |
| 78 | text_stream >> width >> height ; |
| 79 | Skip_Comment(buf_stream); |
| 80 | text_stream >> maxval; |
| 81 | |
| 82 | //cout << line << " " << width << " " << height << " " << maxval << endl; |
| 83 | image->Create( width, height ); |
| 84 | unsigned char *ptr = image->GetData(); |
| 85 | if (!ptr) |
| 86 | { |
| 87 | if (verbose) |
| 88 | wxLogError( _("PNM: Couldn't allocate memory.") ); |
| 89 | return false; |
| 90 | } |
| 91 | |
| 92 | |
| 93 | if (c=='2') // Ascii GREY |
| 94 | { |
| 95 | wxUint32 value, size=width*height; |
| 96 | for (wxUint32 i=0; i<size; ++i) |
| 97 | { |
| 98 | value=text_stream.Read32(); |
| 99 | if ( maxval != 255 ) |
| 100 | value = (255 * value)/maxval; |
| 101 | *ptr++=(unsigned char)value; // R |
| 102 | *ptr++=(unsigned char)value; // G |
| 103 | *ptr++=(unsigned char)value; // B |
| 104 | if ( !buf_stream ) |
| 105 | { |
| 106 | if (verbose) wxLogError(_("PNM: File seems truncated.")); |
| 107 | return false; |
| 108 | } |
| 109 | } |
| 110 | } |
| 111 | if (c=='3') // Ascii RBG |
| 112 | { |
| 113 | wxUint32 value, size=3*width*height; |
| 114 | for (wxUint32 i=0; i<size; ++i) |
| 115 | { |
| 116 | //this is very slow !!! |
| 117 | //I wonder how we can make any better ? |
| 118 | value=text_stream.Read32(); |
| 119 | if ( maxval != 255 ) |
| 120 | value = (255 * value)/maxval; |
| 121 | *ptr++=(unsigned char)value; |
| 122 | |
| 123 | if ( !buf_stream ) |
| 124 | { |
| 125 | if (verbose) wxLogError(_("PNM: File seems truncated.")); |
| 126 | return false; |
| 127 | } |
| 128 | } |
| 129 | } |
| 130 | if (c=='5') // Raw GREY |
| 131 | { |
| 132 | wxUint32 size=width*height; |
| 133 | unsigned char value; |
| 134 | for (wxUint32 i=0; i<size; ++i) |
| 135 | { |
| 136 | buf_stream.Read(&value,1); |
| 137 | if ( maxval != 255 ) |
| 138 | value = (255 * value)/maxval; |
| 139 | *ptr++=value; // R |
| 140 | *ptr++=value; // G |
| 141 | *ptr++=value; // B |
| 142 | if ( !buf_stream ) |
| 143 | { |
| 144 | if (verbose) wxLogError(_("PNM: File seems truncated.")); |
| 145 | return false; |
| 146 | } |
| 147 | } |
| 148 | } |
| 149 | |
| 150 | if ( c=='6' ) // Raw RGB |
| 151 | { |
| 152 | buf_stream.Read(ptr, 3*width*height); |
| 153 | if ( maxval != 255 ) |
| 154 | { |
| 155 | for ( unsigned i = 0; i < 3*width*height; i++ ) |
| 156 | ptr[i] = (255 * ptr[i])/maxval; |
| 157 | } |
| 158 | } |
| 159 | |
| 160 | image->SetMask( false ); |
| 161 | |
| 162 | const wxStreamError err = buf_stream.GetLastError(); |
| 163 | return err == wxSTREAM_NO_ERROR || err == wxSTREAM_EOF; |
| 164 | } |
| 165 | |
| 166 | bool wxPNMHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool WXUNUSED(verbose) ) |
| 167 | { |
| 168 | wxTextOutputStream text_stream(stream); |
| 169 | |
| 170 | //text_stream << "P6" << endl |
| 171 | //<< image->GetWidth() << " " << image->GetHeight() << endl |
| 172 | //<< "255" << endl; |
| 173 | text_stream << wxT("P6\n") << image->GetWidth() << wxT(" ") << image->GetHeight() << wxT("\n255\n"); |
| 174 | stream.Write(image->GetData(),3*image->GetWidth()*image->GetHeight()); |
| 175 | |
| 176 | return stream.IsOk(); |
| 177 | } |
| 178 | |
| 179 | bool wxPNMHandler::DoCanRead( wxInputStream& stream ) |
| 180 | { |
| 181 | Skip_Comment(stream); |
| 182 | |
| 183 | if ( stream.GetC() == 'P' ) |
| 184 | { |
| 185 | switch ( stream.GetC() ) |
| 186 | { |
| 187 | case '2': // ASCII Grey |
| 188 | case '3': // ASCII RGB |
| 189 | case '5': // RAW Grey |
| 190 | case '6': // RAW RGB |
| 191 | return true; |
| 192 | } |
| 193 | } |
| 194 | |
| 195 | return false; |
| 196 | } |
| 197 | |
| 198 | |
| 199 | #endif // wxUSE_STREAMS |
| 200 | |
| 201 | #endif // wxUSE_IMAGE && wxUSE_PNM |