//
// "$Id: cmap.cxx,v 1.4 1999/01/07 19:17:33 mike Exp $"
//
// Colormap generation program for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-1999 by Bill Spitzak and others.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA.
//
// Please report all bugs and problems to "fltk-bugs@easysw.com".
//

// This program produces the contents of "fl_cmap.h" as stdout

// #include <gl/gl.h>
#include <stdio.h>

// This table is initialized with color values I got by reading the
// colormap on an IRIX 4.3 machine:

// "full intensity colors" have been turned down some to make white
// background less intense by default.  The hope is that this will make
// fltk programs more friendly on color-adjusted screens.  If you want
// pure colors you should get them out of the colormap.

#define III 244 // maximum intensity of the basic colors

static short cmap[256][3] = {
// 3-bit colormap:
  {  0,  0,  0},	// black
  {III,  0,  0},	// red
  {  0,III,  0},	// green
  {III,III,  0},	// yellow
  {  0,  0,III},	// blue
  {III,  0,III},	// magenta
  {  0,III,III},	// cyan
  {III,III,III},	// white
// pastel versions of those colors:
  { 85, 85, 85},	// 1/3 gray
  {198,113,113},	// salmon? pale red?
  {113,198,113},	// pale green
  {142,142, 56},	// khaki
  {113,113,198},	// pale blue
  {142, 56,142},	// purple, orchid, pale magenta
  { 56,142,142},	// cadet blue, aquamarine, pale cyan
  {170,170,170},	// 2/3 gray
// These next 16 are the FL_FREE_COLOR area.  For compatability with
// some existing DD programs, I prefill them with the random colors
// you get on a 5.3 machine:
  { 16, 16, 16},
  {128, 40,128},
  {198, 30, 30},
  { 66, 30, 30},
  {176,140,140},
  {  0, 20, 20},
  { 20, 10, 10},
  { 40, 20, 20},
  { 60, 30, 30},
  {  0, 80, 80},
  {  0, 40, 40},
  { 20, 20,  0},
  { 40, 40,  0},
  { 80, 80, 10},
  {150,150, 20},
  {160, 10, 10},
// The rest of the colormap is a gray ramp and table, filled in below:
};

// This is Fl::background from Fl_get_system_colors.C, with modifications:

#define FL_GRAY_RAMP 32
#define FL_NUM_GRAY  24
#define FL_GRAY 49 // old value is 47
typedef unsigned char uchar;
#include <math.h>

void background(uchar r, uchar g, uchar b) {
  // replace the gray ramp so that color 47 (by default 2/3) is this color
  if (!r) r = 1; else if (r==255) r = 254;
  double powr = log(r/255.0)/log((FL_GRAY-FL_GRAY_RAMP)/(FL_NUM_GRAY-1.0));
  if (!g) g = 1; else if (g==255) g = 254;
  double powg = log(g/255.0)/log((FL_GRAY-FL_GRAY_RAMP)/(FL_NUM_GRAY-1.0));
  if (!b) b = 1; else if (b==255) b = 254;
  double powb = log(b/255.0)/log((FL_GRAY-FL_GRAY_RAMP)/(FL_NUM_GRAY-1.0));
  for (int i = 0; i < FL_NUM_GRAY; i++) {
    double gray = i/(FL_NUM_GRAY-1.0);
    cmap[i+FL_GRAY_RAMP][0] = uchar(pow(gray,powr)*255+.5);
    cmap[i+FL_GRAY_RAMP][1] = uchar(pow(gray,powg)*255+.5);
    cmap[i+FL_GRAY_RAMP][2] = uchar(pow(gray,powb)*255+.5);
  }
}

int main() {
  int i,r,g,b;
#if 0
  /* Read colormap colors into internal table */
  long cmwin;
  noport();
  cmwin = winopen("CM");
  for (i=0; i<256; i++)
    getmcolor(i,&cmap[i][0],&cmap[i][1],&cmap[i][2]);
  winclose(cmwin);
#endif
// overwrite the X allocation area with one color so people are
// discouraged from using it:
  for (i=16; i<32; i++) {cmap[i][0]=cmap[i][1]=cmap[i][2] = 85;}

  // fill in the gray ramp:
  background(0xc0, 0xc0, 0xc0); // microsoft colors
  // background(cmap[15][0],cmap[15][1],cmap[15][2]); // old fltk colors
  // copy the 1/3 and 2/3 gray to the closest locations in gray ramp:
  cmap[39][0] = cmap[39][1] = cmap[39][2] = cmap[8][0];
  cmap[47][0] = cmap[47][1] = cmap[47][2] = cmap[15][0];

  // fill in the color cube
  i = 56;
  for (b=0; b<5; b++)
    for (r=0; r<5; r++)
      for (g=0; g<8; g++) {
	cmap[i][0] = r*255/4;
	cmap[i][1] = g*255/7;
	cmap[i][2] = b*255/4;
	i++;
      }

  for (i=0; i<256; i++) {
    printf("\t0x%02x%02x%02x00",cmap[i][0],cmap[i][1],cmap[i][2]);
    if (i < 255) printf(",\n");
  }
  printf("\n");
  return 0;
}

//
// End of "$Id: cmap.cxx,v 1.4 1999/01/07 19:17:33 mike Exp $".
//