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#define XENV_CAP_KEYS (1<<0)
#define XENV_CAP_MOUSE (1<<1)
/* xenv_flags specify if we need keys and mouse,
* on return, flag is removed if input is not available */
int xenv_init(int *xenv_flags, const char *window_title);
/* read events from X, calling key_cb for key, mouseb_cb for mouse button
* and mousem_cb for mouse motion events */
int xenv_update(int (*key_cb)(void *cb_arg, int kc, int is_pressed),
int (*mouseb_cb)(void *cb_arg, int x, int y, int button, int is_pressed),
int (*mousem_cb)(void *cb_arg, int x, int y),
void *cb_arg);
int xenv_minimize(void);
void xenv_finish(void);
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