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/*
* BRLTTY - A background process providing access to the console screen (when in
* text mode) for a blind person using a refreshable braille display.
*
* Copyright (C) 1995-2025 by The BRLTTY Developers.
*
* BRLTTY comes with ABSOLUTELY NO WARRANTY.
*
* This is free software, placed under the terms of the
* GNU Lesser General Public License, as published by the Free Software
* Foundation; either version 2.1 of the License, or (at your option) any
* later version. Please see the file LICENSE-LGPL for details.
*
* Web Page: http://brltty.app/
*
* This software is maintained by Dave Mielke <dave@mielke.cc>.
*/
#include "prologue.h"
#include "alert.h"
#include "brl_cmds.h"
#include "core.h"
void
alertLineSkipped (unsigned int *count) {
const unsigned int interval = 4;
if (!*count) {
alert(ALERT_SKIP_FIRST);
} else if (*count <= interval) {
alert(ALERT_SKIP_ONE);
} else if (!(*count % interval)) {
alert(ALERT_SKIP_SEVERAL);
}
*count += 1;
}
int
isTextOffset (int arg, int *row, int *first, int *last, int relaxed) {
int y = arg / brl.textColumns;
if (y >= brl.textRows) return 0;
if ((ses->winy + y) >= scr.rows) return 0;
int x = arg % brl.textColumns;
if (x < textStart) return 0;
if ((x -= textStart) >= textCount) return 0;
if (isContracted) {
BrailleRowDescriptor *brd = getBrailleRowDescriptor(y);
if (!brd) return 0;
int *offsets = brd->contracted.offsets.array;
if (!offsets) return 0;
int start = 0;
int end = 0;
{
int textIndex = 0;
while (textIndex < brd->contracted.length) {
int cellIndex = offsets[textIndex];
if (cellIndex != CTB_NO_OFFSET) {
if (cellIndex > x) {
end = textIndex - 1;
break;
}
start = textIndex;
}
textIndex += 1;
}
if (textIndex == brd->contracted.length) end = textIndex - 1;
}
if (first) *first = start;
if (last) *last = end;
} else {
if ((ses->winx + x) >= scr.cols) {
if (!relaxed) return 0;
x = scr.cols - ses->winx - 1;
}
if (prefs.wordWrap) {
int length = getWordWrapLength(ses->winy, ses->winx, textCount);
if (length > textCount) length = textCount;
if (x >= length) x = length - 1;
}
if (first) *first = x;
if (last) *last = x;
}
if (row) *row = y;
return 1;
}
int
getCharacterCoordinates (int arg, int *row, int *first, int *last, int relaxed) {
if (arg == BRL_MSK_ARG) {
if (!SCR_CURSOR_OK()) return 0;
if (row) *row = scr.posy;
if (first) *first = scr.posx;
if (last) *last = scr.posx;
} else {
if (!isTextOffset(arg, row, first, last, relaxed)) return 0;
if (row) *row += ses->winy;
if (first) *first += ses->winx;
if (last) *last += ses->winx;
}
return 1;
}
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