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#define DEFAULT_FOREGROUND 0x0  /**< default console foreground color */
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#define DEFAULT_FOREGROUND 0x0  /**< default console foreground color */
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#define DEFAULT_BACKGROUND 0xf0f0f0 /**< default console background color */
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#define DEFAULT_BACKGROUND 0xf0f0f0 /**< default console background color */
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typedef struct {
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typedef struct {
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    uint8_t style;
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} attr_style_t;
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typedef struct {
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    uint8_t fg_color;
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    uint8_t bg_color;
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    uint8_t flags;
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} attr_idx_t;
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typedef struct {
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    uint32_t bg_color;      /**< background color */
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    uint32_t bg_color;      /**< background color */
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    uint32_t fg_color;      /**< foreground color */
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    uint32_t fg_color;      /**< foreground color */
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} attr_rgb_t;
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typedef struct {
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    enum {
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        at_style,
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        at_idx,
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        at_rgb
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    } t;
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    union {
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        attr_style_t s;
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        attr_idx_t i;
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        attr_rgb_t r;
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    } a;
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} style_t;
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} attrs_t;
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/** One field on screen. It contain one character and its attributes. */
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/** One field on screen. It contain one character and its attributes. */
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typedef struct {
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typedef struct {
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    char character;         /**< Character itself */
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    char character;         /**< Character itself */
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    style_t style;          /**< Character`s attributes */
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    attrs_t attrs;          /**< Character`s attributes */
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} keyfield_t;
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} keyfield_t;
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/** Structure for buffering state of one virtual console.
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/** Structure for buffering state of one virtual console.
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 */
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 */
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typedef struct {
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typedef struct {
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    keyfield_t *buffer;         /**< Screen content - characters and its style. Used as cyclyc buffer. */
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    keyfield_t *buffer;         /**< Screen content - characters and their attributes. Used as a circular buffer. */
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    unsigned int size_x, size_y;        /**< Number of columns and rows */
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    unsigned int size_x, size_y;        /**< Number of columns and rows */
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    unsigned int position_x, position_y;    /**< Coordinates of last printed character for determining cursor position */
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    unsigned int position_x, position_y;    /**< Coordinates of last printed character for determining cursor position */
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    style_t style;              /**< Current style */
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    attrs_t attrs;              /**< Current attributes. */
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    unsigned int top_line;          /**< Points to buffer[][] line that will be printed at screen as the first line */
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    unsigned int top_line;          /**< Points to buffer[][] line that will be printed at screen as the first line */
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    unsigned char is_cursor_visible;    /**< Cursor state - default is visible */
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    unsigned char is_cursor_visible;    /**< Cursor state - default is visible */
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} screenbuffer_t;
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} screenbuffer_t;
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/** Returns keyfield for position on screen. Screenbuffer->buffer is cyclic buffer so we must couted in index of the topmost line.
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/** Returns keyfield for position on screen. Screenbuffer->buffer is cyclic buffer so we must couted in index of the topmost line.
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static inline keyfield_t *get_field_at(screenbuffer_t *scr, unsigned int x, unsigned int y)
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static inline keyfield_t *get_field_at(screenbuffer_t *scr, unsigned int x, unsigned int y)
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{
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{
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    return scr->buffer + x + ((y + scr->top_line) % scr->size_y) * scr->size_x;
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    return scr->buffer + x + ((y + scr->top_line) % scr->size_y) * scr->size_x;
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}
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}
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/** Compares two styles.
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/** Compares two sets of attributes.
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 * @param s1 first style
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 * @param s1 first style
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 * @param s2 second style
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 * @param s2 second style
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 * @return nonzero on equality
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 * @return nonzero on equality
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 */
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 */
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static inline int style_same(style_t s1, style_t s2)
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static inline int attrs_same(attrs_t a1, attrs_t a2)
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{
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{
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    if (a1.t != a2.t) return 0;
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    switch (a1.t) {
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    case at_style: return a1.a.s.style == a2.a.s.style;
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    case at_idx: return a1.a.i.fg_color == a2.a.i.fg_color &&
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        a1.a.i.bg_color == a2.a.i.bg_color &&
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        a1.a.i.flags == a2.a.i.flags;
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    return s1.fg_color == s2.fg_color && s1.bg_color == s2.bg_color;
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    case at_rgb: return a1.a.r.fg_color == a2.a.r.fg_color &&
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        a1.a.r.bg_color == a2.a.r.bg_color;
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    }
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}
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}
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void screenbuffer_putchar(screenbuffer_t *scr, char c);
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void screenbuffer_putchar(screenbuffer_t *scr, char c);
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screenbuffer_t *screenbuffer_init(screenbuffer_t *scr, int size_x, int size_y);
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screenbuffer_t *screenbuffer_init(screenbuffer_t *scr, int size_x, int size_y);
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void screenbuffer_clear(screenbuffer_t *scr);
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void screenbuffer_clear(screenbuffer_t *scr);
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void screenbuffer_clear_line(screenbuffer_t *scr, unsigned int line);
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void screenbuffer_clear_line(screenbuffer_t *scr, unsigned int line);
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void screenbuffer_copy_buffer(screenbuffer_t *scr, keyfield_t *dest);
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void screenbuffer_copy_buffer(screenbuffer_t *scr, keyfield_t *dest);
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void screenbuffer_goto(screenbuffer_t *scr, unsigned int x, unsigned int y);
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void screenbuffer_goto(screenbuffer_t *scr, unsigned int x, unsigned int y);
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void screenbuffer_set_style(screenbuffer_t *scr, int style);
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void screenbuffer_set_style(screenbuffer_t *scr, unsigned int fg_color, unsigned int bg_color);
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void screenbuffer_set_color(screenbuffer_t *scr, unsigned int fg_color,
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    unsigned int bg_color, unsigned int attr);
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void screenbuffer_set_rgb_color(screenbuffer_t *scr, unsigned int fg_color,
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    unsigned int bg_color);
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#endif
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#endif
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/** @}
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/** @}