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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 <stdio.h>
#include <string.h>
#include "log.h"
#include "parameters.h"
#include "async_handle.h"
#include "async_alarm.h"
#include "alert.h"
#include "scr.h"
#include "scr_frozen.h"
static ScreenDescription screenDescription;
static ScreenCharacter *screenCharacters;
static int startFreezeReminderAlarm (void);
static AsyncHandle freezeReminderAlarm = NULL;
ASYNC_ALARM_CALLBACK(handleFreezeReminderAlarm) {
asyncDiscardHandle(freezeReminderAlarm);
freezeReminderAlarm = NULL;
alert(ALERT_FREEZE_REMINDER);
startFreezeReminderAlarm();
}
static int
startFreezeReminderAlarm (void) {
if (freezeReminderAlarm) return 1;
return asyncNewRelativeAlarm(&freezeReminderAlarm,
SCREEN_FREEZE_REMINDER_INTERVAL,
handleFreezeReminderAlarm, NULL);
}
static void
stopFreezeReminderAlarm (void) {
if (freezeReminderAlarm) {
asyncCancelRequest(freezeReminderAlarm);
freezeReminderAlarm = NULL;
}
}
static int
construct_FrozenScreen (BaseScreen *source) {
describeScreenObject(&screenDescription, source);
if ((screenCharacters = calloc(screenDescription.rows*screenDescription.cols, sizeof(*screenCharacters)))) {
const ScreenBox box = {
.left=0, .width=screenDescription.cols,
.top=0, .height=screenDescription.rows
};
if (source->readCharacters(&box, screenCharacters)) {
startFreezeReminderAlarm();
return 1;
}
free(screenCharacters);
screenCharacters = NULL;
} else {
logMallocError();
}
return 0;
}
static void
destruct_FrozenScreen (void) {
stopFreezeReminderAlarm();
if (screenCharacters) {
free(screenCharacters);
screenCharacters = NULL;
}
}
static void
describe_FrozenScreen (ScreenDescription *description) {
*description = screenDescription;
}
static int
readCharacters_FrozenScreen (const ScreenBox *box, ScreenCharacter *buffer) {
if (validateScreenBox(box, screenDescription.cols, screenDescription.rows)) {
int row;
for (row=0; row<box->height; row++) {
memcpy(&buffer[row * box->width],
&screenCharacters[((box->top + row) * screenDescription.cols) + box->left],
box->width * sizeof(*screenCharacters));
}
return 1;
}
return 0;
}
static int
currentVirtualTerminal_FrozenScreen (void) {
return screenDescription.number;
}
void
initializeFrozenScreen (FrozenScreen *frozen) {
initializeBaseScreen(&frozen->base);
frozen->base.describe = describe_FrozenScreen;
frozen->base.readCharacters = readCharacters_FrozenScreen;
frozen->base.currentVirtualTerminal = currentVirtualTerminal_FrozenScreen;
frozen->construct = construct_FrozenScreen;
frozen->destruct = destruct_FrozenScreen;
screenCharacters = NULL;
}
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