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//
// Colormap generation program for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2026 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file. If this
// file is missing or damaged, see the license at:
//
// https://www.fltk.org/COPYING.php
//
// Please see the following page on how to report bugs and issues:
//
// https://www.fltk.org/bugs.php
//
//
// This program produces the contents of "fl_cmap.h" on stdout. If you
// need to change the built-in FLTK colormap, change this source file
// accordingly and proceed as follows:
//
// (1) Build the program `bin/cmap`
//
// $ `MAKE` cmap # see below for details
//
// or
//
// $ cmake --build . --target cmap
//
// in your CMake build directory (replace `MAKE` with your build tool,
// for instance `make` or `ninja` or whatever you chose to build FLTK).
//
// (2) Run the program from the build folder:
//
// $ bin/cmap > output.h
//
// (3) Compare `output.h` with the existing file in the source folder
// `[fltk-source-dir]/src/fl_cmap.h`. Take care that the result (diff)
// is plausible.
//
// (4) Replace `[fltk-source-dir]/src/fl_cmap.h` in the FLTK source tree
// with the created file `output.h`.
//
// (5) Build and test FLTK, check if the new color map is as intended.
//
// (6) Finally check in *both* modified file with `git commit` and push
// your changes to the main repository with `git push`.
//
// Note: the created executable `bin/cmap` is temporary and may be deleted
// at any time. It is not intended to be `installed` with the FLTK library.
//
#include <stdio.h>
#include <math.h>
#include <time.h>
// This table is initialized with color values taken from 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
// that results in errors and unshared colormap entries, so full intensity:
#define III 255 // 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, from SGI's standard color map:
{ 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
// The next location (index 15) is used for FL_SELECTION_COLOR. It formerly
// was 2/3 gray but this is changed to be the Windows blue color. This
// allows the default behavior on both X and Windows to match:
// {170,170,170}, // old 2/3 gray color
{ 0, 0,128}, // 15 = FL_SELECTION_COLOR
// These next 16 (index 16 - 31) are the FL_FREE_COLOR area. In some
// versions of FLTK these were filled with random colors that a Irix 5.3
// machine placed in these locations.
// This version uses colors that NewTek has assigned for their GUI
// (from George Yohng):
{168,168,152}, // 16 = FL_FREE_COLOR
{232,232,216},
{104,104, 88},
{152,168,168},
{216,232,232},
{ 88,104,104},
{156,156,168},
{220,220,232},
{ 92, 92,104},
{156,168,156},
{220,232,220},
{ 92,104, 92},
{144,144,144},
{192,192,192},
{ 80, 80, 80},
{160,160,160}, // 31
// The rest of the colormap is a gray ramp and table, filled in below:
};
// This is Fl::background from Fl_get_system_colors.cxx, with modifications:
#define FL_GRAY_RAMP 32
#define FL_NUM_GRAY 24
#define FL_GRAY 49 // old value is 47
typedef unsigned char uchar;
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, year;
time_t t = time(0);
struct tm *lt = localtime(&t);
year = lt->tm_year + 1900; // copyright year
// fill in the gray ramp:
// background(170, 170, 170); // old fltk colors
background(0xc0, 0xc0, 0xc0); // microsoft 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] = 85;
cmap[47][0] = cmap[47][1] = cmap[47][2] = 170;
// 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++;
}
}
}
// write comment into 'cmap.h' so the reader knows what it is good for
printf("//\n");
printf("// DO NOT EDIT THIS FILE !\n");
printf("//\n");
printf("// This file must be generated by \"util/cmap.cxx\".\n");
printf("// See instructions in this file.\n");
printf("//\n");
printf("// Copyright 1998-%d by Bill Spitzak and others.\n", year);
printf("//\n");
printf("// This library is free software. Distribution and use rights are outlined in\n");
printf("// the file \"COPYING\" which should have been included with this file. If this\n");
printf("// file is missing or damaged, see the license at:\n");
printf("//\n");
printf("// https://www.fltk.org/COPYING.php\n");
printf("//\n");
printf("// Please see the following page on how to report bugs and issues:\n");
printf("//\n");
printf("// https://www.fltk.org/bugs.php\n");
printf("//\n");
// write color map values
for (i = 0; i < 256; i++) {
printf(" 0x%02x%02x%02x00", cmap[i][0], cmap[i][1], cmap[i][2]);
if (i < 255)
printf(", // %3d\n", i);
else
printf(" // %3d\n", i);
}
// write final comment
printf("//\n");
printf("// End of src/fl_cmap.h - generated by util/cmap.cxx\n");
printf("//\n");
return 0;
}
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