cosmopolitan/tool/build/lib/cga.c

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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi
Copyright 2020 Justine Alexandra Roberts Tunney
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
#include "libc/macros.h"
#include "libc/str/str.h"
#include "tool/build/lib/buffer.h"
#include "tool/build/lib/cga.h"
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static const uint8_t kCgaToAnsi[] = {30, 34, 32, 36, 31, 35, 33, 37,
90, 94, 92, 96, 91, 95, 93, 97};
void DrawCga(struct Panel *p, uint8_t v[25][80][2]) {
unsigned y, x, n, a;
n = MIN(25, p->bottom - p->top);
for (y = 0; y < n; ++y) {
a = -1;
for (x = 0; x < 80; ++x) {
if (v[y][x][1] != a) {
a = v[y][x][1];
AppendFmt(&p->lines[y], "\e[%d;%dm", kCgaToAnsi[a & 0x0F],
kCgaToAnsi[(a & 0xF0) >> 4] + 10);
}
AppendWide(&p->lines[y], kCp437[v[y][x][0]]);
}
AppendStr(&p->lines[y], "\e[0m");
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}
}