src/common/imagxpm.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        imagxpm.cpp
   3 // Purpose:     wxXPMHandler
   4 // Author:      Vaclav Slavik, Robert Roebling
   5 // RCS-ID:      $Id$
   6 // Copyright:   (c) 2001 Vaclav Slavik
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10 /*
  11
  12 This file is partially based on source code of ImageMagick by John Cristy. Its
  13 license is as follows:
  14
  15 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  16 %                                                                             %
  17 %                                                                             %
  18 %                                                                             %
  19 %                            X   X  PPPP   M   M                              %
  20 %                             X X   P   P  MM MM                              %
  21 %                              X    PPPP   M M M                              %
  22 %                             X X   P      M   M                              %
  23 %                            X   X  P      M   M                              %
  24 %                                                                             %
  25 %                                                                             %
  26 %                    Read/Write ImageMagick Image Format.                     %
  27 %                                                                             %
  28 %                                                                             %
  29 %                              Software Design                                %
  30 %                                John Cristy                                  %
  31 %                                 July 1992                                   %
  32 %                                                                             %
  33 %                                                                             %
  34 %  Copyright (C) 2001 ImageMagick Studio, a non-profit organization dedicated %
  35 %  to making software imaging solutions freely available.                     %
  36 %                                                                             %
  37 %  Permission is hereby granted, free of charge, to any person obtaining a    %
  38 %  copy of this software and associated documentation files ("ImageMagick"),  %
  39 %  to deal in ImageMagick without restriction, including without limitation   %
  40 %  the rights to use, copy, modify, merge, publish, distribute, sublicense,   %
  41 %  and/or sell copies of ImageMagick, and to permit persons to whom the       %
  42 %  ImageMagick is furnished to do so, subject to the following conditions:    %
  43 %                                                                             %
  44 %  The above copyright notice and this permission notice shall be included in %
  45 %  all copies or substantial portions of ImageMagick.                         %
  46 %                                                                             %
  47 %  The software is provided "as is", without warranty of any kind, express or %
  48 %  implied, including but not limited to the warranties of merchantability,   %
  49 %  fitness for a particular purpose and noninfringement.  In no event shall   %
  50 %  ImageMagick Studio be liable for any claim, damages or other liability,    %
  51 %  whether in an action of contract, tort or otherwise, arising from, out of  %
  52 %  or in connection with ImageMagick or the use or other dealings in          %
  53 %  ImageMagick.                                                               %
  54 %                                                                             %
  55 %  Except as contained in this notice, the name of the ImageMagick Studio     %
  56 %  shall not be used in advertising or otherwise to promote the sale, use or  %
  57 %  other dealings in ImageMagick without prior written authorization from the %
  58 %  ImageMagick Studio.                                                        %
  59 %                                                                             %
  60 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  61 %
  62 %
  63 */
  64
  65 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  66 #pragma implementation "imagxpm.h"
  67 #endif
  68
  69 // For compilers that support precompilation, includes "wx.h".
  70 #include "wx/wxprec.h"
  71
  72 #ifdef __BORLANDC__
  73 #  pragma hdrstop
  74 #endif
  75
  76 #ifndef WX_PRECOMP
  77 #  include "wx/defs.h"
  78 #endif
  79
  80 #if wxUSE_XPM
  81
  82 #include "wx/imagxpm.h"
  83 #include "wx/wfstream.h"
  84 #include "wx/log.h"
  85 #include "wx/intl.h"
  86 #include "wx/utils.h"
  87 #include "wx/xpmdecod.h"
  88
  89 IMPLEMENT_DYNAMIC_CLASS(wxXPMHandler,wxImageHandler)
  90
  91 //-----------------------------------------------------------------------------
  92 // wxXPMHandler
  93 //-----------------------------------------------------------------------------
  94
  95 #if wxUSE_STREAMS
  96
  97 bool wxXPMHandler::LoadFile(wxImage *image,
  98                             wxInputStream& stream,
  99                             bool WXUNUSED(verbose), int WXUNUSED(index))
 100 {
 101     wxXPMDecoder decoder;
 102
 103     wxImage img = decoder.ReadFile(stream);
 104     if ( !img.Ok() )
 105         return FALSE;
 106     *image = img;
 107     return TRUE;
 108 }
 109
 110
 111 static char hexArray[] = "0123456789ABCDEF";
 112
 113 static void DecToHex(int dec, char *buf)
 114 {
 115     int firstDigit = (int)(dec/16.0);
 116     int secondDigit = (int)(dec - (firstDigit*16.0));
 117     buf[0] = hexArray[firstDigit];
 118     buf[1] = hexArray[secondDigit];
 119     buf[2] = 0;
 120 }
 121
 122
 123 bool wxXPMHandler::SaveFile(wxImage * image,
 124                             wxOutputStream& stream, bool WXUNUSED(verbose))
 125 {
 126     wxString tmp;
 127     char tmp_c;
 128
 129     // 1. count colours:
 130     #define MaxCixels  92
 131     static const char Cixel[MaxCixels+1] =
 132                          " .XoO+@#$%&*=-;:>,<1234567890qwertyuipasdfghjk"
 133                          "lzxcvbnmMNBVCZASDFGHJKLPIUYTREWQ!~^/()_`'][{}|";
 134     int chars_per_pixel;
 135     int cols;
 136     int i, j, k;
 137
 138     cols = image->CountColours();
 139     chars_per_pixel = 1;
 140     for ( k = MaxCixels; cols > k; k *= MaxCixels)
 141         chars_per_pixel++;
 142
 143     // 2. write the header:
 144     wxString sName;
 145     if ( image->HasOption(wxIMAGE_OPTION_FILENAME) )
 146     {
 147         wxSplitPath(image->GetOption(wxIMAGE_OPTION_FILENAME),
 148                     NULL, &sName, NULL);
 149         sName << wxT("_xpm");
 150     }
 151
 152     if ( !sName.IsEmpty() )
 153         sName = wxString(wxT("/* XPM */\nstatic char *")) + sName;
 154     else
 155         sName = wxT("/* XPM */\nstatic char *xpm_data");
 156     stream.Write( (const char*) sName.ToAscii(), sName.Len() );
 157
 158     char tmpbuf[200];
 159     // VS: 200b is safe upper bound for anything produced by sprintf below
 160     //     (<101 bytes the string, neither %i can expand into more than 10 chars)
 161     sprintf(tmpbuf,
 162                "[] = {\n"
 163                "/* columns rows colors chars-per-pixel */\n"
 164                "\"%i %i %i %i\",\n",
 165                image->GetWidth(), image->GetHeight(), cols, chars_per_pixel);
 166     stream.Write(tmpbuf, strlen(tmpbuf));
 167
 168     // 3. create color symbols table:
 169     wxImageHistogram histogram;
 170     image->ComputeHistogram(histogram);
 171
 172     char *symbols_data = new char[cols * (chars_per_pixel+1)];
 173     char **symbols = new char*[cols];
 174
 175     // 2a. find mask colour:
 176     unsigned long mask_key = 0x1000000 /*invalid RGB value*/;
 177     if (image->HasMask())
 178         mask_key = (image->GetMaskRed() << 16) |
 179                    (image->GetMaskGreen() << 8) | image->GetMaskBlue();
 180
 181     // 2b. generate colour table:
 182     for (wxImageHistogram::iterator entry = histogram.begin();
 183          entry != histogram.end(); entry++ )
 184     {
 185         unsigned long index = entry->second.index;
 186         symbols[index] = symbols_data + index * (chars_per_pixel+1);
 187         char *sym = symbols[index];
 188
 189         k = index % MaxCixels;
 190         sym[0] = Cixel[k];
 191         for (j = 1; j < chars_per_pixel; j++)
 192         {
 193             k = ((index - k) / MaxCixels) % MaxCixels;
 194             sym[j] = Cixel[k];
 195         }
 196         sym[j] = '\0';
 197
 198         unsigned long key = entry->first;
 199
 200         if (key == 0)
 201             sprintf( tmpbuf, "\"%s c Black\",\n", sym);
 202         else if (key == mask_key)
 203             sprintf( tmpbuf, "\"%s c None\",\n", sym);
 204         else
 205         {
 206             char rbuf[3];
 207             DecToHex( (unsigned char)(key >> 16), rbuf );
 208             char gbuf[3];
 209             DecToHex( (unsigned char)(key >> 8), gbuf );
 210             char bbuf[3];
 211             DecToHex( (unsigned char)(key), bbuf );
 212             sprintf( tmpbuf, "\"%s c #%s%s%s\",\n", sym, rbuf, gbuf, bbuf );
 213         }
 214         stream.Write( tmpbuf, strlen(tmpbuf) );
 215     }
 216
 217     tmp = wxT("/* pixels */\n");
 218     stream.Write( (const char*) tmp.ToAscii(), tmp.Length() );
 219
 220     unsigned char *data = image->GetData();
 221     for (j = 0; j < image->GetHeight(); j++)
 222     {
 223         tmp_c = '\"'; stream.Write(&tmp_c, 1);
 224         for (i = 0; i < image->GetWidth(); i++, data += 3)
 225         {
 226             unsigned long key = (data[0] << 16) | (data[1] << 8) | (data[2]);
 227             stream.Write(symbols[histogram[key].index], chars_per_pixel);
 228         }
 229         tmp_c = '\"'; stream.Write(&tmp_c, 1);
 230         if ( j + 1 < image->GetHeight() )
 231         {
 232             tmp_c = ','; stream.Write(&tmp_c, 1);
 233         }
 234         tmp_c = '\n'; stream.Write(&tmp_c, 1);
 235     }
 236     tmp = wxT("};\n");
 237     stream.Write( (const char*) tmp.ToAscii(), 3 );
 238
 239     // Clean up:
 240     delete[] symbols;
 241     delete[] symbols_data;
 242
 243     return TRUE;
 244 }
 245
 246 bool wxXPMHandler::DoCanRead(wxInputStream& stream)
 247 {
 248     wxXPMDecoder decoder;
 249     return decoder.CanRead(stream);
 250 }
 251
 252 #endif  // wxUSE_STREAMS
 253
 254 #endif // wxUSE_XPM