72 lines
3.2 KiB
C
72 lines
3.2 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "dsp/core/ks8.h"
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#include "libc/macros.h"
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#include "libc/mem/mem.h"
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#include "libc/str/str.h"
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#include "libc/sysv/errfuns.h"
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#include "libc/time/time.h"
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#include "libc/x/x.h"
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#include "tool/viz/lib/convolution.h"
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#include "tool/viz/lib/graphic.h"
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#define SHARPEN(...) KS8(0, 0, 0, 0, -1, -1, 5, -1, -1, 0, 0, 0, __VA_ARGS__)
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long sharpen(long cn, long yw, long xw, unsigned char p[cn][yw][xw], long yn,
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long xn) {
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long rc, c, y, x;
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short(*ta)[3][xn];
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unsigned *iy, *ix;
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if (yn >= 3 && xn > 0) {
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ta = memalign(32, sizeof(short) * xn * 3);
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iy = convoindex(1, yn, 1);
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ix = convoindex(1, xn, 1);
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if (ta && iy && ix) {
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iy += 1;
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ix += 1;
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for (c = 0; c < 3; ++c) {
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for (y = 0; y < yn + 3; ++y) {
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if (y >= 3) {
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for (x = 0; x < xn; ++x) {
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p[c][y - 3][x] = MIN(255, MAX(0, (*ta)[y % 3][x]));
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}
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}
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if (y < yn) {
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for (x = 0; x < xn; ++x) {
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(*ta)[y % 3][x] =
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SHARPEN(p[c][iy[y - 1]][x], p[c][y][ix[x - 1]], p[c][y][x],
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p[c][y][ix[x + 1]], p[c][iy[y + 1]][x]);
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}
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}
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}
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}
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rc = 0;
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} else {
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rc = enomem();
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}
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free(ta);
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if (ix) free(ix - 1);
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if (iy) free(iy - 1);
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} else {
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rc = einval();
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}
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return rc;
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}
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