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define rgb_to_cmap (r, g, b, file)
{
variable rgb = (r << 16)|(g<<8)|b;
variable name = path_basename_sans_extname (file);
if (NULL != stat_file (file))
throw IOError, sprintf ("File %s exists-- delete it if you want to overwrite", file);
variable fp = fopen (file, "w");
() = fputs (`% -*- slang -*-
%
$1 =
[`,
fp);
_for (0, length(rgb)-1, 1)
{
variable i = ();
if ((i mod 8) == 0)
() = fputs ("\n ", fp);
() = fprintf (fp, "0x%06X,", rgb[i]);
}
() = fprintf (fp, `
];
png_add_colormap ("%s", __tmp($1));
`,
name);
() = fclose (fp);
}
#ifnfalse
require ("gslinterp");
require ("readascii");
private define convert_normalized_color (c, n)
{
variable cx = [0:1:#length(c)];
variable x = [0:1:#n];
variable y = interp_linear (x, cx, c);
return int (y*255.999);
}
define slsh_main ()
{
variable r, g, b;
variable file = __argv[1];
() = readascii (file, &r, &g, &b);
r = convert_normalized_color (r, 256);
g = convert_normalized_color (g, 256);
b = convert_normalized_color (b, 256);
rgb_to_cmap (r, g, b, path_basename_sans_extname (file) + ".map");
}
#endif
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