/* sc_screen.h — экранная EMM-модель Commander 80x32. */

#ifndef SC_SCREEN_API_H
#define SC_SCREEN_API_H

#include <stdint.h>

#define SC_SCREEN_W       80u
#define SC_SCREEN_H       32u
#define SC_ROW_BYTES     160u
#define SC_SCREEN_BYTES 5120u

#define SC_SCROLL_UP       1u
#define SC_SCROLL_DOWN     2u

typedef struct {
    uint8_t ch;
    uint8_t attr;
} ScCell;

typedef char ScCell_must_be_2_bytes[(sizeof(ScCell) == 2) ? 1 : -1];

void sc_screen_attach(uint8_t page);
void sc_screen_detach(void);
void sc_screen_clear(uint8_t attr);
void sc_screen_cell(uint8_t x, uint8_t y, uint8_t ch, uint8_t attr);
void sc_screen_fill(uint8_t x, uint8_t y, uint8_t width,
                    uint8_t ch, uint8_t attr);
void sc_screen_text(uint8_t x, uint8_t y, const char *text,
                    uint8_t attr, uint8_t max_width);
int  sc_screen_present_full(void);
int  sc_screen_present_row(uint8_t x, uint8_t y, uint8_t width);
int  sc_screen_present_rows(uint8_t first, uint8_t count);
int  sc_screen_scroll_rows(uint8_t x, uint8_t y,
                           uint8_t width, uint8_t height,
                           uint8_t direction, uint8_t fill_attr);

#endif