FreeBSD/Linux Kernel Cross Reference
sys/bitsy/gamma.c

     #include <u.h>
     #include <libc.h>
     #include <stdio.h>
     
     double  gamma = 1.6;
     
     int
     remap5(int i)
     {
            double v;
    
            v = (double)i/31.0;
            return 31.0*pow(v, gamma);
    }
    
    int
    remap6(int i)
    {
            double v;
    
            v = (double)i/63.0;
            return 63.0*pow(v, gamma);
    }
    
    int
    remap(int i)
    {
            int r, g, b;
    
            b = i & 0x1F;
            g = (i>>5) & 0x3F;
            r = (i>>11) & 0x1F;
            return (remap5(r)<<11) | (remap6(g)<<5) | (remap5(b)<<0);
    }
    
    void
    main(void)
    {
            int i;
    
            printf("/* gamma = %.2f */\n", gamma);
            printf("ushort gamma[65536] = {\n");
            for(i=0; i<65536; i++){
                    if((i%8) == 0)
                            printf("\t");
                    printf("0x%.4x, ", remap(i));
                    if((i%8) == 7)
                            printf("\n");
            }
            printf("};\n");
    }

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