src/common/imagxpm.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/common/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 // For compilers that support precompilation, includes "wx.h".
  66 #include "wx/wxprec.h"
  67
  68 #ifdef __BORLANDC__
  69     #pragma hdrstop
  70 #endif
  71
  72 #if wxUSE_XPM
  73
  74 #ifndef WX_PRECOMP
  75     #include "wx/log.h"
  76     #include "wx/intl.h"
  77 #endif
  78
  79 #include "wx/imagxpm.h"
  80 #include "wx/wfstream.h"
  81 #include "wx/utils.h"
  82 #include "wx/xpmdecod.h"
  83
  84 IMPLEMENT_DYNAMIC_CLASS(wxXPMHandler,wxImageHandler)
  85
  86 //-----------------------------------------------------------------------------
  87 // wxXPMHandler
  88 //-----------------------------------------------------------------------------
  89
  90 #if wxUSE_STREAMS
  91
  92 bool wxXPMHandler::LoadFile(wxImage *image,
  93                             wxInputStream& stream,
  94                             bool WXUNUSED(verbose), int WXUNUSED(index))
  95 {
  96     wxXPMDecoder decoder;
  97
  98     wxImage img = decoder.ReadFile(stream);
  99     if ( !img.Ok() )
 100         return false;
 101     *image = img;
 102     return true;
 103 }
 104
 105
 106 static char hexArray[] = "0123456789ABCDEF";
 107
 108 static void DecToHex(int dec, char *buf)
 109 {
 110     int firstDigit = (int)(dec/16.0);
 111     int secondDigit = (int)(dec - (firstDigit*16.0));
 112     buf[0] = hexArray[firstDigit];
 113     buf[1] = hexArray[secondDigit];
 114     buf[2] = 0;
 115 }
 116
 117
 118 bool wxXPMHandler::SaveFile(wxImage * image,
 119                             wxOutputStream& stream, bool WXUNUSED(verbose))
 120 {
 121     wxString tmp;
 122     char tmp_c;
 123
 124     // 1. count colours:
 125     #define MaxCixels  92
 126     static const char Cixel[MaxCixels+1] =
 127                          " .XoO+@#$%&*=-;:>,<1234567890qwertyuipasdfghjk"
 128                          "lzxcvbnmMNBVCZASDFGHJKLPIUYTREWQ!~^/()_`'][{}|";
 129     int chars_per_pixel;
 130     int cols;
 131     int i, j, k;
 132
 133     cols = image->CountColours();
 134     chars_per_pixel = 1;
 135     for ( k = MaxCixels; cols > k; k *= MaxCixels)
 136         chars_per_pixel++;
 137
 138     // 2. write the header:
 139     wxString sName;
 140     if ( image->HasOption(wxIMAGE_OPTION_FILENAME) )
 141     {
 142         wxSplitPath(image->GetOption(wxIMAGE_OPTION_FILENAME),
 143                     NULL, &sName, NULL);
 144         sName << wxT("_xpm");
 145     }
 146
 147     if ( !sName.empty() )
 148         sName = wxString(wxT("/* XPM */\nstatic char *")) + sName;
 149     else
 150         sName = wxT("/* XPM */\nstatic char *xpm_data");
 151     stream.Write( (const char*) sName.ToAscii(), sName.Len() );
 152
 153     char tmpbuf[200];
 154     // VS: 200b is safe upper bound for anything produced by sprintf below
 155     //     (<101 bytes the string, neither %i can expand into more than 10 chars)
 156     sprintf(tmpbuf,
 157                "[] = {\n"
 158                "/* columns rows colors chars-per-pixel */\n"
 159                "\"%i %i %i %i\",\n",
 160                image->GetWidth(), image->GetHeight(), cols, chars_per_pixel);
 161     stream.Write(tmpbuf, strlen(tmpbuf));
 162
 163     // 3. create color symbols table:
 164     wxImageHistogram histogram;
 165     image->ComputeHistogram(histogram);
 166
 167     char *symbols_data = new char[cols * (chars_per_pixel+1)];
 168     char **symbols = new char*[cols];
 169
 170     // 2a. find mask colour:
 171     unsigned long mask_key = 0x1000000 /*invalid RGB value*/;
 172     if (image->HasMask())
 173         mask_key = (image->GetMaskRed() << 16) |
 174                    (image->GetMaskGreen() << 8) | image->GetMaskBlue();
 175
 176     // 2b. generate colour table:
 177     for (wxImageHistogram::iterator entry = histogram.begin();
 178          entry != histogram.end(); ++entry )
 179     {
 180         unsigned long index = entry->second.index;
 181         symbols[index] = symbols_data + index * (chars_per_pixel+1);
 182         char *sym = symbols[index];
 183
 184         k = index % MaxCixels;
 185         sym[0] = Cixel[k];
 186         for (j = 1; j < chars_per_pixel; j++)
 187         {
 188             k = ((index - k) / MaxCixels) % MaxCixels;
 189             sym[j] = Cixel[k];
 190         }
 191         sym[j] = '\0';
 192
 193         unsigned long key = entry->first;
 194
 195         if (key == 0)
 196             sprintf( tmpbuf, "\"%s c Black\",\n", sym);
 197         else if (key == mask_key)
 198             sprintf( tmpbuf, "\"%s c None\",\n", sym);
 199         else
 200         {
 201             char rbuf[3];
 202             DecToHex( (unsigned char)(key >> 16), rbuf );
 203             char gbuf[3];
 204             DecToHex( (unsigned char)(key >> 8), gbuf );
 205             char bbuf[3];
 206             DecToHex( (unsigned char)(key), bbuf );
 207             sprintf( tmpbuf, "\"%s c #%s%s%s\",\n", sym, rbuf, gbuf, bbuf );
 208         }
 209         stream.Write( tmpbuf, strlen(tmpbuf) );
 210     }
 211
 212     tmp = wxT("/* pixels */\n");
 213     stream.Write( (const char*) tmp.ToAscii(), tmp.length() );
 214
 215     unsigned char *data = image->GetData();
 216     for (j = 0; j < image->GetHeight(); j++)
 217     {
 218         tmp_c = '\"'; stream.Write(&tmp_c, 1);
 219         for (i = 0; i < image->GetWidth(); i++, data += 3)
 220         {
 221             unsigned long key = (data[0] << 16) | (data[1] << 8) | (data[2]);
 222             stream.Write(symbols[histogram[key].index], chars_per_pixel);
 223         }
 224         tmp_c = '\"'; stream.Write(&tmp_c, 1);
 225         if ( j + 1 < image->GetHeight() )
 226         {
 227             tmp_c = ','; stream.Write(&tmp_c, 1);
 228         }
 229         tmp_c = '\n'; stream.Write(&tmp_c, 1);
 230     }
 231     tmp = wxT("};\n");
 232     stream.Write( (const char*) tmp.ToAscii(), 3 );
 233
 234     // Clean up:
 235     delete[] symbols;
 236     delete[] symbols_data;
 237
 238     return true;
 239 }
 240
 241 bool wxXPMHandler::DoCanRead(wxInputStream& stream)
 242 {
 243     wxXPMDecoder decoder;
 244     return decoder.CanRead(stream);
 245 }
 246
 247 #endif  // wxUSE_STREAMS
 248
 249 #endif // wxUSE_XPM