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/* Copyright (c) 1986 Regents of the University of California */ |
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|
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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#endif |
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|
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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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|
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#include <stdio.h> |
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|
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#include "color.h" |
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|
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|
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double minlog = 0.0; /* minimum for log scale (0 == linear) */ |
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|
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|
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main(argc, argv) |
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int argc; |
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char *argv[]; |
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{ |
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COLOR col; |
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double d1,d2,d3, atof(), log(); |
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int i; |
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|
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printargs(argc, argv, stdout); |
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|
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setcolor(col, 1.0, 1.0, 1.0); |
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|
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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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|
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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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} |
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|
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|
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greyscale(col0) /* output our grey scale */ |
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COLOR col0; |
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{ |
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double exp(); |
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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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|
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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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|
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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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|
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|
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printargs(ac, av, fp) /* 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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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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} |
