| 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 | #ifdef __GNUG__ |
| 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.LastError()!=wxSTREAM_NOERROR) |
| 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 | return (buf_stream.LastError()==wxStream_NOERROR || buf_stream.LastError()==wxStream_EOF); |
| 123 | } |
| 124 | |
| 125 | bool wxPNMHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool WXUNUSED(verbose) ) |
| 126 | { |
| 127 | wxTextOutputStream text_stream(stream); |
| 128 | |
| 129 | //text_stream << "P6" << endl |
| 130 | //<< image->GetWidth() << " " << image->GetHeight() << endl |
| 131 | //<< "255" << endl; |
| 132 | text_stream << "P6\n" << image->GetWidth() << " " << image->GetHeight() << "\n255\n"; |
| 133 | stream.Write(image->GetData(),3*image->GetWidth()*image->GetHeight()); |
| 134 | |
| 135 | return (stream.LastError()==wxStream_NOERROR); |
| 136 | } |
| 137 | |
| 138 | bool wxPNMHandler::DoCanRead( wxInputStream& stream ) |
| 139 | { |
| 140 | off_t pos = stream.TellI(); |
| 141 | |
| 142 | Skip_Comment(stream); |
| 143 | |
| 144 | if ( stream.GetC() == 'P' ) |
| 145 | { |
| 146 | switch (stream.GetC()) |
| 147 | { |
| 148 | case '3': |
| 149 | case '6': |
| 150 | stream.SeekI(pos); |
| 151 | return TRUE; |
| 152 | } |
| 153 | } |
| 154 | |
| 155 | stream.SeekI(pos); |
| 156 | return FALSE; |
| 157 | } |
| 158 | |
| 159 | |
| 160 | #endif // wxUSE_STREAMS |
| 161 | |
| 162 | #endif // wxUSE_PNM |