xpm

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// Copyright (C) 2010, Guy Barrand. All rights reserved.
// See the file tools.license for terms.
 
#ifndef tools_xpm
#define tools_xpm
 
#include <cstdio> //FILE,size_t
#include <string>
#include <vector>
#include <ostream>
 
#include "charmanip"
 
namespace tools {
namespace xpm {
 
typedef unsigned char* (*file_reader)(std::ostream&,const std::string&,unsigned int&,unsigned int&,unsigned int&);
 
inline bool to_xpm(std::ostream& a_out,const std::string& a_file,const std::string& a_name,file_reader a_file_reader,bool a_verbose) {
  // a_name is the xpm name. Then a string without a path and without
  // the .xpm suffix.
 
  unsigned int w,h,bpp;
  unsigned char* buffer = a_file_reader(a_out,a_file,w,h,bpp);
  if(!buffer) {
    a_out << "tools::xpm::to_xpm :"
          << " read_file failed."
          << std::endl;
    return false;
  }
 
  // get colormap :
 
  typedef unsigned int color;
  std::vector<color> colors;
 
 {unsigned char r,g,b;
  for(unsigned int j=0;j<h;j++) {
    unsigned char* pos = buffer + j * (w * 3);
    for(unsigned int i=0;i<w;i++) {
      r = *pos;pos++;
      g = *pos;pos++;
      b = *pos;pos++;
 
      color c = 0;
      unsigned char* ca = (unsigned char*)&c;
      ca[0] = r;
      ca[1] = g;
      ca[2] = b;
      ca[3] = 0;
 
      //printf("debug : get : %d %d %d : %lu\n",r,g,b,colors.size());
 
      bool found = false;
      std::vector<color>::iterator it;
      for(it=colors.begin();it!=colors.end();++it) {
        if(*it==c) {
          found = true;
          break;
        }
      }
      if(!found) colors.push_back(c);
 
    }
  }}
 
  unsigned int colorn = (unsigned int)colors.size();
 
  //get a set of non problematic characters (for exa avoid \‍).
  std::vector<unsigned char> chars;
 {for(unsigned char c=0;c<255;c++) {
    if(is_letter(c)||is_digit(c)) {
      chars.push_back(c);
    }
  }}
 
  unsigned int base = (unsigned int)chars.size();
 
  unsigned int nchar = 1;
 {unsigned int i = colorn;
  while(i>=base) {
    //unsigned int r = i%base;
    i /= base;
    nchar++;
  }}
 
  if(a_verbose) {
    a_out << "colors " << colorn
          << " base " << base
          << " nchar " << nchar
          << std::endl;
  }
 
  std::string xpm = a_name+".xpm";
 
  FILE* out = ::fopen(xpm.c_str(),"wb");
  if(!out) {
    a_out << "tools::xpm::to_xpm :"
          << " can't open " << xpm
          << std::endl;
    delete [] buffer;
    return false;
  }
 
  ::fprintf(out,"%s","/* XPM */\n");
  ::fprintf(out,"static const char *%s[] = {\n",a_name.c_str());
  ::fprintf(out,"\"%u %u %u %u\",\n",w,h,colorn,nchar);
 
  // write colormap :
 {for(unsigned int index=0;index<colorn;index++) {
    ::fprintf(out,"%s","\"");
 
   {unsigned int ix = index;
    for(unsigned int ic=0;ic<nchar;ic++) {
      ::fprintf(out,"%c",chars[ix%base]);
      ix /= base;
    }}
 
    ::fprintf(out,"%s","\tc #");
 
    color c = colors[index];
    unsigned char* ca = (unsigned char*)&c;
    ::fprintf(out,"%02x%02x%02x",ca[0],ca[1],ca[2]);
 
    ::fprintf(out,"%s","\",\n");
  }}
 
  //pixmap :
 {unsigned char r,g,b;
  for(unsigned int j=0;j<h;j++) {
    unsigned char* pos = buffer + j * (w * 3);
    ::fprintf(out,"%s","\"");
    for(unsigned int i=0;i<w;i++) {
      r = *pos;pos++;
      g = *pos;pos++;
      b = *pos;pos++;
 
      color c;
      unsigned char* ca = (unsigned char*)&c;
      ca[0] = r;
      ca[1] = g;
      ca[2] = b;
      ca[3] = 0;
 
      bool found = false;
     {for(unsigned int index=0;index<colorn;index++) {
        //unsigned char c1 = index%base;
        //unsigned char c2 = index/base;
        if(c==colors[index]) {
 
         {unsigned int ix = index;
          for(unsigned int ic=0;ic<nchar;ic++) {
            ::fprintf(out,"%c",chars[ix%base]);
            ix /= base;
          }}
 
          //::fprintf(out,"%c%c",chars[c1],chars[c2]);
 
          found = true;
          break;
        }
      }}
      if(!found) {
        a_out << "tools::xpm::to_xpm :"
              << " color not found in the colormap."
              << std::endl;
        ::fclose(out);
        ::remove(xpm.c_str());
        delete [] buffer;
        return false;
      }
 
    }
    if(j==(h-1))
      ::fprintf(out,"%s\n","\"");
    else
      ::fprintf(out,"%s\n","\",");
  }}
 
  ::fprintf(out,"%s","};");
 
  ::fclose(out);
  delete [] buffer;
 
  return true;
}
 
 
}}
 
#endif