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Diffstat (limited to 'gen.c')
| -rw-r--r-- | gen.c | 115 |
1 files changed, 115 insertions, 0 deletions
@@ -0,0 +1,115 @@ +/* + * Compface - 48x48x1 image compression and decompression + * + * Copyright (c) James Ashton - Sydney University - June 1990. + * + * Written 11th November 1989. + * + * Permission is given to distribute these sources, as long as the + * copyright messages are not removed, and no monies are exchanged. + * + * No responsibility is taken for any errors on inaccuracies inherent + * either to the comments or the code of this program, but if reported + * to me, then an attempt will be made to fix them. + */ + + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include "compface.h" + +#define GEN(g) F[h] ^= G.g[k]; break + +static void Gen P((char *)) ; + +static void +Gen(f) +register char *f; +{ + register int m, l, k, j, i, h; + + for (j = 0; j < HEIGHT; j++) + { + for (i = 0; i < WIDTH; i++) + { + h = i + j * WIDTH; + k = 0; + for (l = i - 2; l <= i + 2; l++) + for (m = j - 2; m <= j; m++) + { + if ((l >= i) && (m == j)) + continue; + if ((l > 0) && (l <= WIDTH) && (m > 0)) + k = *(f + l + m * WIDTH) ? k * 2 + 1 : k * 2; + } + switch (i) + { + case 1 : + switch (j) + { + case 1 : GEN(g_22); + case 2 : GEN(g_21); + default : GEN(g_20); + } + break; + case 2 : + switch (j) + { + case 1 : GEN(g_12); + case 2 : GEN(g_11); + default : GEN(g_10); + } + break; + case WIDTH - 1 : + switch (j) + { + case 1 : GEN(g_42); + case 2 : GEN(g_41); + default : GEN(g_40); + } + break; + case WIDTH : + switch (j) + { + case 1 : GEN(g_32); + case 2 : GEN(g_31); + default : GEN(g_30); + } + break; + default : + switch (j) + { + case 1 : GEN(g_02); + case 2 : GEN(g_01); + default : GEN(g_00); + } + break; + } + } + } +} + +void +GenFace() +{ + static char new[PIXELS]; + register char *f1; + register char *f2; + register int i; + + f1 = new; + f2 = F; + i = PIXELS; + while (i-- > 0) + *(f1++) = *(f2++); + Gen(new); +} + +void +UnGenFace() +{ + Gen(F); +} + |