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#ifndef lint
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static const char RCSid[] = "$Id: greyscale.c,v 2.7 2004/03/28 20:33:13 schorsch Exp $";
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#endif
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/*
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* greyscale.c - program to produce grey test levels.
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*
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* 4/21/86
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*/
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#include <stdio.h>
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#include <math.h>
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#include "color.h"
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double minlog = 0.0; /* minimum for log scale (0 == linear) */
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static void greyscale(COLOR col0);
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static void printargs(int ac, char **av, FILE *fp);
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int
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main(
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int argc,
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char *argv[]
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)
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{
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COLOR col;
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double d1,d2,d3;
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int i;
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printargs(argc, argv, stdout);
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setcolor(col, 1.0, 1.0, 1.0);
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for (i = 1; i < argc && argv[i][0] == '-'; i++)
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switch (argv[i][1]) {
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case 'c':
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d1 = atof(argv[++i]);
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d2 = atof(argv[++i]);
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d3 = atof(argv[++i]);
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setcolor(col, d1, d2, d3);
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break;
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case 'l':
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d1 = atof(argv[++i]);
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if (d1 <= 0.0)
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minlog = 0.0;
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else
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minlog = log(d1);
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break;
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default:
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fprintf(stderr, "%s: unknown option \"%s\"\n",
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argv[0], argv[i]);
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exit(1);
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}
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printf("\n");
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printf("-Y 512 +X 512\n");
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greyscale(col);
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return 0;
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}
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static void
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greyscale( /* output our grey scale */
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COLOR col0
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)
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{
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COLOR col1, col2, scanline[512];
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double x;
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int j;
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register int i, k;
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for (j = 0; j < 512; j += 32) {
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for (k = 0; k < 512; k++)
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setcolor(scanline[k], 0.0, 0.0, 0.0);
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for (k = 0; k < 4; k++)
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if (fwritescan(scanline, 512, stdout) < 0)
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goto writerr;
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x = j/32 / 16.0;
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if (minlog != 0.0)
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x = exp((1.0-x)*minlog);
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setcolor(col1, x, x, x);
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for (i = 0; i < 512; i += 32) {
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for (k = 0; k < 4; k++)
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setcolor(scanline[i+k], 0.0, 0.0, 0.0);
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x = i/32 / 255.0;
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if (minlog != 0.0) {
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x = exp(-x*minlog);
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setcolor(col2, x, x, x);
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multcolor(col2, col1);
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} else {
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setcolor(col2, x, x, x);
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addcolor(col2, col1);
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}
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multcolor(col2, col0);
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for (k = 4; k < 32; k++)
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copycolor(scanline[i+k], col2);
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}
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for (i = 0; i < 28; i++)
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if (fwritescan(scanline, 512, stdout) < 0)
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goto writerr;
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}
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return;
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writerr:
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fprintf(stderr, "write error in greyscale\n");
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exit(1);
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}
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static void
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printargs( /* print arguments to a file */
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int ac,
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char **av,
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FILE *fp
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)
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{
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while (ac-- > 0) {
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fputs(*av++, fp);
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putc(' ', fp);
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}
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putc('\n', fp);
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}
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