/*
 * 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) 1995-2023 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>.
 */

#ifndef BRLTTY_INCLUDED_SCR_EMULATOR
#define BRLTTY_INCLUDED_SCR_EMULATOR

#include "scr_terminal.h"

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

extern void moveScreenCharacters(ScreenSegmentCharacter *to,
                                 const ScreenSegmentCharacter *from,
                                 size_t count);
extern void setScreenCharacters(ScreenSegmentCharacter *from,
                                const ScreenSegmentCharacter *to,
                                const ScreenSegmentCharacter *character);
extern void propagateScreenCharacter(ScreenSegmentCharacter *from,
                                     const ScreenSegmentCharacter *to);

#define SCREEN_SEGMENT_COLOR(r, g, b) \
  { .red = r, .green = g, .blue = b }
#define SCREEN_SEGMENT_COLOR_LEVEL 0XAA
#define SCREEN_SEGMENT_COLOR_BLACK SCREEN_SEGMENT_COLOR(0, 0, 0)
#define SCREEN_SEGMENT_COLOR_WHITE                                             \
  SCREEN_SEGMENT_COLOR(SCREEN_SEGMENT_COLOR_LEVEL, SCREEN_SEGMENT_COLOR_LEVEL, \
                       SCREEN_SEGMENT_COLOR_LEVEL)

extern void fillScreenRows(ScreenSegmentHeader *segment, unsigned int row,
                           unsigned int count,
                           const ScreenSegmentCharacter *character);
extern void moveScreenRows(ScreenSegmentHeader *segment, unsigned int from,
                           unsigned int to, unsigned int count);
extern void scrollScreenRows(ScreenSegmentHeader *segment, unsigned int top,
                             unsigned int size, unsigned int count, int down);

extern ScreenSegmentHeader *createScreenSegment(int *identifier, key_t key,
                                                int columns, int rows,
                                                int enableRowArray);
extern int destroyScreenSegment(int identifier);

extern int createMessageQueue(int *queue, key_t key);
extern int destroyMessageQueue(int queue);

#ifdef __cplusplus
}
#endif /* __cplusplus */

#endif /* BRLTTY_INCLUDED_SCR_EMULATOR */