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#include <cairo.h>
enum position {
POS_UNSET = -1,
POS_LEFT = 0,
POS_CENTRE = 1,
POS_RIGHT = 2,
POS_TOP = 0 << 4,
POS_MIDDLE = 1 << 4,
POS_BOTTOM = 2 << 4,
POS_TOP_LEFT = POS_TOP | POS_LEFT,
POS_TOP_CENTRE = POS_TOP | POS_CENTRE,
POS_TOP_RIGHT = POS_TOP | POS_RIGHT,
POS_MIDDLE_LEFT = POS_MIDDLE | POS_LEFT,
POS_MIDDLE_CENTRE = POS_MIDDLE | POS_CENTRE,
POS_MIDDLE_RIGHT = POS_MIDDLE | POS_RIGHT,
POS_BOTTOM_LEFT = POS_BOTTOM | POS_LEFT,
POS_BOTTOM_CENTRE = POS_BOTTOM | POS_CENTRE,
POS_BOTTOM_RIGHT = POS_BOTTOM | POS_RIGHT,
};
struct overlay {
cairo_surface_t *surface;
void (*show)(struct overlay *);
void (*position)(struct overlay *, enum position);
void (*hide)(struct overlay *);
};
extern const cairo_user_data_key_t overlay_key;
cairo_surface_t *x11_overlay_create(enum position pos, int *width, int *height);
void x11_overlay_stop(void);
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