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 #ifdef __GNUG__
  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
  81 #include "wx/imagxpm.h"
  82 #include "wx/wfstream.h"
  83 #include "wx/log.h"
  84 #include "wx/intl.h"
  85 #include "wx/utils.h"
  86 #include "wx/xpmdecod.h"
  87
  88 IMPLEMENT_DYNAMIC_CLASS(wxXPMHandler,wxImageHandler)
  89
  90 //-----------------------------------------------------------------------------
  91 // wxXPMHandler
  92 //-----------------------------------------------------------------------------
  93
  94 #if wxUSE_STREAMS
  95
  96 bool wxXPMHandler::LoadFile(wxImage *image,
  97                             wxInputStream& stream,
  98                             bool WXUNUSED(verbose), int WXUNUSED(index))
  99 {
 100     wxXPMDecoder decoder;
 101
 102     wxImage img = decoder.ReadFile(stream);
 103     if ( !img.Ok() )
 104         return FALSE;
 105     *image = img;
 106     return TRUE;
 107 }
 108
 109 bool wxXPMHandler::SaveFile(wxImage * image,
 110                             wxOutputStream& stream, bool WXUNUSED(verbose))
 111 {
 112     wxString tmp;
 113     char tmp_c;
 114
 115     // 1. count colours:
 116     #define MaxCixels  92
 117     static const char Cixel[MaxCixels+1] =
 118                          " .XoO+@#$%&*=-;:>,<1234567890qwertyuipasdfghjk"
 119                          "lzxcvbnmMNBVCZASDFGHJKLPIUYTREWQ!~^/()_`'][{}|";
 120     int chars_per_pixel;
 121     int cols;
 122     int i, j, k;
 123
 124     cols = image->CountColours();
 125     chars_per_pixel = 1;
 126     for ( k = MaxCixels; cols > k; k *= MaxCixels)
 127         chars_per_pixel++;
 128
 129     // 2. write the header:
 130     char tmpbuf[200];
 131     // VS: 200b is safe upper bound for anything produced by sprintf bellow
 132     //     (101 bytes the string, neither %i can expand into more than 10 chars)
 133     sprintf(tmpbuf,
 134                "/* XPM */\n"
 135                "static char *xpm_data[] = {\n"
 136                "/* columns rows colors chars-per-pixel */\n"
 137                "\"%i %i %i %i\",\n",
 138                image->GetWidth(), image->GetHeight(), cols, chars_per_pixel);
 139     stream.Write(tmpbuf, strlen(tmpbuf));
 140
 141     // 3. create color symbols table:
 142     wxHashTable table(wxKEY_INTEGER);
 143     image->ComputeHistogram(table);
 144
 145     char *symbols_data = new char[cols * (chars_per_pixel+1)];
 146     char **symbols = new char*[cols];
 147
 148     // 2a. find mask colour:
 149     long mask_key = -1;
 150     if (image->HasMask())
 151         mask_key = (image->GetMaskRed() << 16) |
 152                    (image->GetMaskGreen() << 8) | image->GetMaskBlue();
 153
 154     // 2b. generate colour table:
 155     table.BeginFind();
 156     wxNode *node = NULL;
 157     while ((node = table.Next()) != NULL)
 158     {
 159         wxHNode *hnode = (wxHNode*) node->GetData();
 160         long index = hnode->index;
 161         symbols[index] = symbols_data + index * (chars_per_pixel+1);
 162         char *sym = symbols[index];
 163
 164         k = index % MaxCixels;
 165         sym[0] = Cixel[k];
 166         for (j = 1; j < chars_per_pixel; j++)
 167         {
 168             k = ((index - k) / MaxCixels) % MaxCixels;
 169             sym[j] = Cixel[k];
 170         }
 171         sym[j] = '\0';
 172
 173         long key = node->GetKeyInteger();
 174
 175         if (key == 0)
 176             tmp.Printf(wxT("\"%s c Black\",\n"), sym);
 177         else if (key == mask_key)
 178             tmp.Printf(wxT("\"%s c None\",\n"), sym);
 179         else
 180             tmp.Printf(wxT("\"%s c #%s%s%s\",\n"), sym,
 181                        wxDecToHex((unsigned char)(key >> 16)).c_str(),
 182                        wxDecToHex((unsigned char)(key >> 8)).c_str(),
 183                        wxDecToHex((unsigned char)(key)).c_str());
 184         stream.Write(tmp.mb_str(), tmp.Length());
 185     }
 186
 187     tmp = wxT("/* pixels */\n");
 188     stream.Write(tmp.mb_str(), tmp.Length());
 189
 190     unsigned char *data = image->GetData();
 191     for (j = 0; j < image->GetHeight(); j++)
 192     {
 193         tmp_c = '\"'; stream.Write(&tmp_c, 1);
 194         for (i = 0; i < image->GetWidth(); i++, data += 3)
 195         {
 196             unsigned long key = (data[0] << 16) | (data[1] << 8) | (data[2]);
 197             wxHNode *hnode = (wxHNode*) table.Get(key);
 198             stream.Write(symbols[hnode->index], chars_per_pixel);
 199         }
 200         tmp_c = '\"'; stream.Write(&tmp_c, 1);
 201         if ( j + 1 < image->GetHeight() )
 202         {
 203             tmp_c = ','; stream.Write(&tmp_c, 1);
 204         }
 205         tmp_c = '\n'; stream.Write(&tmp_c, 1);
 206     }
 207     tmp = wxT("};\n");
 208     stream.Write(tmp.mb_str(), 3);
 209
 210     delete[] symbols;
 211     delete[] symbols_data;
 212
 213     return TRUE;
 214 }
 215
 216 bool wxXPMHandler::DoCanRead(wxInputStream& stream)
 217 {
 218     wxXPMDecoder decoder;
 219     return decoder.CanRead(stream);
 220 }
 221
 222 #endif  // wxUSE_STREAMS
 223