/* epd.h - E-Paper Display library API */

#ifndef EPD_H_
#define EPD_H_

/* Includes */
#include "stddef.h"
#include "stdint.h"
#include "stdbool.h"
#include "epd_font.h"
#include "epd_fonts.h"

/* Data Structures */
typedef struct epd_s epd_t;
typedef enum epd_dir_e {
	EPD_DIR_L2R,
	EPD_DIR_T2B,
	EPD_DIR_R2L,
	EPD_DIR_B2T
} epd_dir_t;
typedef uint8_t epd_dbuf_t;
typedef int (*epd_spi_write)(const uint8_t *, size_t, void *);
typedef void (*epd_spi_cs)(bool, void *);
typedef void (*epd_gpo_dc)(bool, void *);
typedef void (*epd_gpo_rst)(bool, void *);
typedef bool (*epd_gpi_busy)(void *);
typedef void (*epd_sleep_ms)(uint32_t, void *);
typedef struct epd_platform_config_s {
	epd_spi_write spi_write;
	epd_spi_cs spi_cs;
	epd_gpo_dc dc;
	epd_gpo_rst rst;
	epd_gpi_busy busy;
	epd_sleep_ms sleep_ms;
	void *udata;
} epd_platform_config_t;
typedef int32_t (*epd_write_dbuf)(epd_t *);
typedef struct epd_display_config_s {
	uint32_t w;
	uint32_t h;
	epd_write_dbuf write;
} epd_display_config_t;
typedef uint16_t (*epd_char_cb)(epd_t *epd, uint8_t b);
typedef struct epd_font_decode_s
{
	const uint8_t *decode_ptr; /* pointer to the compressed data */

	uint16_t target_x;
	uint16_t target_y;

	int8_t x;                  /* local coordinates, (0,0) is upper left */
	int8_t y;
	int8_t glyph_width;
	int8_t glyph_height;

	uint8_t decode_bit_pos;    /* bitpos inside a byte of the compressed data */
	uint8_t is_transparent;
	uint8_t fg_color;
	uint8_t bg_color;
#ifdef EPD_WITH_FONT_ROTATION
	uint8_t dir;               /* direction */
#endif
} epd_font_decode_t;
typedef struct epd_font_data_s {
	epd_fontcfg_t cfg;
	uint8_t utf8_state;
	uint16_t encoding;
	uint8_t height_mode;
	int8_t ref_ascent;
	int8_t ref_descent;
	epd_font_decode_t decode;
	epd_char_cb char_cb;
} epd_font_data_t;
struct epd_s {
	epd_platform_config_t platform;
	epd_display_config_t display;
	epd_dbuf_t *dbuf;
	epd_font_t *font;
	epd_font_data_t fontdata;
	uint8_t draw_color;
};

/* Function Prototypes */
void epd_init(epd_t *epd, epd_platform_config_t *cfg);
void epd_display_init(epd_t *epd, epd_display_config_t *cfg);
int8_t epd_dbuf_set(epd_t *epd, epd_dbuf_t *dbuf);
int8_t epd_dbuf_clear(epd_t *epd);
void epd_draw_line(epd_t *epd, uint16_t x, uint16_t y, uint16_t len, epd_dir_t dir);
int32_t epd_update(epd_t *epd);

#endif /* EPD_H_ */