5.9 KiB
% ncdirect_init(3) % nick black nickblack@linux.com % v2.0.7
NAME
ncdirect_init - minimal notcurses instances for styling text
SYNOPSIS
#include <notcurses/direct.h>
struct ncdirect ncdirect_init(const char termtype, FILE* fp, uint64_t flags);**
unsigned ncdirect_palette_size(const struct ncdirect nc);*
int ncdirect_bg_rgb8(struct ncdirect nc, unsigned r, unsigned g, unsigned b);*
int ncdirect_fg_rgb8(struct ncdirect nc, unsigned r, unsigned g, unsigned b);*
int ncdirect_fg_rgb(struct ncdirect nc, unsigned rgb);*
int ncdirect_bg_rgb(struct ncdirect nc, unsigned rgb);*
int ncdirect_fg_default(struct ncdirect nc);*
int ncdirect_bg_default(struct ncdirect nc);*
int ncdirect_dim_x(const struct ncdirect nc);*
int ncdirect_dim_y(const struct ncdirect nc);*
int ncdirect_styles_set(struct ncdirect n, unsigned stylebits);*
int ncdirect_styles_on(struct ncdirect n, unsigned stylebits);*
int ncdirect_styles_off(struct ncdirect n, unsigned stylebits);*
int ncdirect_clear(struct ncdirect nc)*
int ncdirect_stop(struct ncdirect nc);*
int ncdirect_cursor_move_yx(struct ncdirect n, int y, int x);*
int ncdirect_cursor_enable(struct ncdirect nc);*
int ncdirect_cursor_disable(struct ncdirect nc);*
int ncdirect_cursor_up(struct ncdirect nc, int num);*
int ncdirect_cursor_left(struct ncdirect nc, int num);*
int ncdirect_cursor_right(struct ncdirect nc, int num);*
int ncdirect_cursor_down(struct ncdirect nc, int num);*
int ncdirect_putstr(struct ncdirect nc, uint64_t channels, const char utf8);**
int ncdirect_printf_aligned(struct ncdirect n, int y, ncalign_e align, const char fmt, ...);**
bool ncdirect_canopen_images(const struct ncdirect n);*
bool ncdirect_canutf8(const struct ncdirect n);*
int ncdirect_hline_interp(struct ncdirect n, const char egc, int len, uint64_t h1, uint64_t h2);**
int ncdirect_vline_interp(struct ncdirect n, const char egc, int len, uint64_t h1, uint64_t h2);**
int ncdirect_box(struct ncdirect n, uint64_t ul, uint64_t ur, uint64_t ll, uint64_t lr, const wchar_t wchars, int ylen, int xlen, unsigned ctlword);**
int ncdirect_rounded_box(struct ncdirect n, uint64_t ul, uint64_t ur, uint64_t ll, uint64_t lr, int ylen, int xlen, unsigned ctlword);*
int ncdirect_double_box(struct ncdirect n, uint64_t ul, uint64_t ur, uint64_t ll, uint64_t lr, int ylen, int xlen, unsigned ctlword);*
int ncdirect_render_image(struct ncdirect n, const char filename, ncblitter_e blitter, ncscale_e scale);**
DESCRIPTION
ncdirect_init prepares the FILE provided as fp for colorizing and styling. On success, a pointer to a valid struct ncdirect is returned. NULL is returned on failure. Before the process exits, ncdirect_stop should be called to reset the terminal and free up resources. ncdirect_init places the terminal into "cbreak" (also known as "rare") mode, disabling line-buffering and echo of input. ncdirect_stop restores the terminal state as it was when the corresponding ncdirect_init call was made.
The following flags are defined:
-
NCDIRECT_OPTION_INHIBIT_SETLOCALE: Unless this flag is set, ncdirect_init will call setlocale(LC_ALL, NULL). If the result is either "C" or "POSIX", it will print a diagnostic to stderr, and then call setlocale(LC_ALL, ""). This will attempt to set the locale based off the LANG environment variable. Your program should call setlocale(3) itself, usually as one of the first lines.
-
NCDIRECT_OPTION_INHIBIT_CBREAK: Unless this flag is set, ncdirect_init will place the terminal into cbreak mode (i.e. disabling echo and line buffering; see tcgetattr(3)).
An appropriate terminfo(5) entry must exist for the terminal. This entry is usually selected using the value of the TERM environment variable (see getenv(3)), but a non-NULL value for termtype will override this. An invalid terminfo specification can lead to reduced performance, reduced display capabilities, and/or display errors. notcurses natively targets 24bpp/8bpc RGB color, and it is thus desirable to use a terminal with the rgb capability (e.g. xterm's xterm-direct).
ncdirect_dim_x returns the current number of columns, and ncdirect_dim_y the current number of rows.
ncdirect_clear clears the screen using a control code if one exists in terminfo. Otherwise, it prints successive newlines to scroll everything off.
ncdirect_cursor_move_yx moves the cursor to the specified coordinate. -1 can be specified for either y or x to leave that axis unchanged.
ncdirect_enable_cursor and ncdirect_disable_cursor always flush the output stream, taking effect immediately.
ncdirect_cursor_up and friends all move relative to the current position. Attempting to e.g. move up while on the top row will return 0, but have no effect.
RETURN VALUES
ncdirect_init returns NULL on failure. Otherwise, the return value points to a valid struct ncdirect, which can be used until it is provided to ncdirect_stop.
ncdirect_putstr and ncdirect_printf_aligned return the number of bytes written on success. On failure, they return some negative number.
All other functions return 0 on success, and non-zero on error.
SEE ALSO
getenv(3), termios(3), notcurses(3), notcurses_plane(3), terminfo(5)