52 lines
2.8 KiB
C
52 lines
2.8 KiB
C
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/*-*- 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/tty/tty.h"
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#include "libc/alg/alg.h"
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#include "libc/nexgen32e/nexgen32e.h"
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#include "libc/str/str.h"
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static int histcmp(const uint8_t *i1p, const uint8_t *i2p,
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uint32_t histogram[hasatleast 256]) {
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if (histogram[*i1p] > histogram[*i2p]) {
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return -1;
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} else if (histogram[*i1p] < histogram[*i2p]) {
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return 1;
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} else {
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return 0;
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}
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}
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void ttyhisto(uint32_t histogram[hasatleast 256],
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uint8_t dominant[hasatleast 256], const uint8_t *xtcolors,
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const uint8_t *eqmask, size_t size) {
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size_t i;
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uint64_t q;
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memset(histogram, 0, sizeof(uint32_t) * 256);
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for (i = 0; i < size / 8; ++i) {
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memcpy(&q, &xtcolors[i * 8], 8);
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if (q == (xtcolors[i * 8] & 0xff) * 0x0101010101010101ul) {
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histogram[xtcolors[i * 8]]++;
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}
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}
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imapxlatab(dominant);
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qsort_r(dominant, 256, 1, (void *)histcmp, histogram);
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}
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