71 lines
3.2 KiB
C
71 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 "libc/macros.h"
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#include "libc/str/str.h"
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#include "tool/build/lib/buffer.h"
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#include "tool/build/lib/mda.h"
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#define kBlink 1
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#define kVisible 2
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#define kUnderline 4
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#define kBold 8
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#define kReverse 16
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/**
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* Decodes Monochrome Display Adapter attributes.
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* @see https://www.seasip.info/VintagePC/mda.html
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*/
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static uint8_t DecodeMdaAttributes(int8_t a) {
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uint8_t r = 0;
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if (a & 0x77) {
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if ((a & 0x77) == 0x70) r |= kReverse;
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if ((a & 0x07) == 0x01) r |= kUnderline;
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if (a & 0x08) r |= kBold;
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if (a < 0) r |= kBlink;
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r |= kVisible;
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}
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return r;
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}
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void DrawMda(struct Panel *p, uint8_t v[25][80][2]) {
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unsigned y, x, n, a, b;
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n = MIN(25, p->bottom - p->top);
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for (y = 0; y < n; ++y) {
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a = -1;
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for (x = 0; x < 80; ++x) {
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b = DecodeMdaAttributes(v[y][x][1]);
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if (a != b) {
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a = b;
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AppendStr(&p->lines[y], "\e[0");
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if (a & kBold) AppendStr(&p->lines[y], ";1");
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if (a & kUnderline) AppendStr(&p->lines[y], ";4");
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if (a & kBlink) AppendStr(&p->lines[y], ";5");
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if (a & kReverse) AppendStr(&p->lines[y], ";7");
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AppendChar(&p->lines[y], 'm');
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}
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if (a) {
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AppendWide(&p->lines[y], kCp437[v[y][x][0]]);
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} else {
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AppendChar(&p->lines[y], ' ');
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}
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}
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}
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}
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