% notcurses_direct(3) % nick black % v2.3.6 # NAME notcurses_direct - minimal notcurses instances for styling text # SYNOPSIS ```c #include #define NCDIRECT_OPTION_INHIBIT_SETLOCALE 0x0001ull #define NCDIRECT_OPTION_INHIBIT_CBREAK 0x0002ull #define NCDIRECT_OPTION_NO_QUIT_SIGHANDLERS 0x0008ull #define NCDIRECT_OPTION_VERBOSE 0x0010ull #define NCDIRECT_OPTION_VERY_VERBOSE 0x0020ull ``` **struct ncdirect* ncdirect_init(const char* ***termtype***, FILE* ***fp***, uint64_t ***flags***);** **unsigned ncdirect_palette_size(const struct ncdirect* ***nc***);** **int ncdirect_set_bg_rgb8(struct ncdirect* ***nc***, unsigned ***r***, unsigned ***g***, unsigned ***b***);** **int ncdirect_set_fg_rgb8(struct ncdirect* ***nc***, unsigned ***r***, unsigned ***g***, unsigned ***b***);** **int ncdirect_set_fg_rgb(struct ncdirect* ***nc***, unsigned ***rgb***);** **int ncdirect_set_bg_rgb(struct ncdirect* ***nc***, unsigned ***rgb***);** **int ncdirect_set_fg_default(struct ncdirect* ***nc***);** **int ncdirect_set_bg_default(struct ncdirect* ***nc***);** **int ncdirect_set_fg_palindex(struct ncdirect* ***nc***, int ***pidx***);** **int ncdirect_set_bg_palindex(struct ncdirect* ***nc***, int ***pidx***);** **int ncdirect_dim_x(const struct ncdirect* ***nc***);** **int ncdirect_dim_y(const struct ncdirect* ***nc***);** **unsigned ncdirect_supported_styles(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***);** **unsigned ncdirect_styles(struct ncdirect* ***n***);** **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***, ***...***);** **const char* ncdirect_detected_terminal(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***);** **ncdirectv* ncdirect_render_frame(struct ncdirect* ***n***, const char* ***filename***, ncblitter_e ***blitter***, ncscale_e ***scale***, int ***maxy***, int ***maxx***);** **char* ncdirect_readline(struct ncdirect* ***n***, const char* ***prompt***);** **bool ncdirect_cantruecolor(const struct ncdirect* ***nc***);** **bool ncdirect_canchangecolor(const struct ncdirect* ***nc***);** **bool ncdirect_canfade(const struct ncdirect* ***nc***);** **bool ncdirect_canopen_images(const struct ncdirect* ***nc***);** **bool ncdirect_canopen_videos(const struct ncdirect* ***nc***);** **bool ncdirect_canutf8(const struct ncdirect* ***nc***);** **int ncdirect_check_pixel_support(const struct ncdirect* ***nc***);** **bool ncdirect_canhalfblock(const struct ncdirect* ***nc***);** **bool ncdirect_canquadrant(const struct ncdirect* ***nc***);** **bool ncdirect_cansextant(const struct ncdirect* ***nc***);** **bool ncdirect_canbraille(const struct ncdirect* ***nc***);** **bool ncdirect_canget_cursor(const struct ncdirect* ***nc***);** ```c typedef struct ncvgeom { int pixy, pixx; // true pixel geometry of ncvisual data int cdimy, cdimx; // terminal cell geometry when this was calculated int rpixy, rpixx; // rendered pixel geometry int rcelly, rcellx; // rendered cell geometry int scaley, scalex; // pixels per filled cell // only defined for NCBLIT_PIXEL int maxpixely, maxpixelx; } ncvgeom; ``` **int ncdirect_render_image(struct ncdirect* ***n***, const char* ***filename***, ncblitter_e ***blitter***, ncscale_e ***scale***);** **int ncdirect_raster_frame(struct ncdirect* ***n***, ncdirectv* ***ncdv***, ncalign_e ***align***);** **int ncdirect_stream(struct ncdirect* ***n***, const char* ***filename***, ncstreamcb ***streamer***, struct ncvisual_options* ***vopts***, void* ***curry***);** **int ncdirect_raster_frame(struct ncdirect* ***n***, ncdirectv* ***ncdv***, ncalign_e ***align***);** **struct ncdirectf* ncdirectf_from_file(struct ncdirect* ***n***, const char* ***filename***);*** **void ncdirectf_free(struct ncdirectf* ***frame***);** **ncdirectv* ncdirectf_render(struct ncdirect* ***n***, struct ncdirectf* ***frame***, const struct ncvisual_options ***vopts***);** **int ncdirectf_geom(struct ncdirect* ***n***, struct ncdirectf* ***frame***, const struct ncvisual_options ***vopts***, ncvgeom* ***geom***);** # 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. A process can have only one context active at once. 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)**). * **NCDIRECT_OPTION_NO_QUIT_SIGHANDLERS**: A signal handler will usually be installed for **SIGINT**, **SIGILL**, **SIGQUIT**, **SIGSEGV**, **SIGTERM**, and **SIGABRT**, cleaning up the terminal on such exceptions. With this flag, the handler will not be installed. * **NCDIRECT_OPTION_VERBOSE**: Enable diagnostics to **stderr** at the level of **NCLOGLEVEL_WARNING**. * **NCDIRECT_OPTION_VERY_VERBOSE**: Enable all diagnostics (equivalent to **NCLOGLEVEL_TRACE**). Implies **NCDIRECT_OPTION_VERBOSE**. 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. **ncdirect_readline** uses the Readline library to read a (heap-allocated) line of arbitrary length, supporting line-editing controls. For more information, consult **readline(3)**. If you want input echoed to the terminal while using **ncdirect_readline**, **NCDIRECT_OPTION_INHIBIT_CBREAK** must be supplied to **ncdirect_init**. **ncdirect_check_pixel_support** must be called (and successfully return) before **NCBLIT_PIXEL** can be used to render images; see **notcurses_visual(3)** for more details. When rendering an image, ***maxy*** and ***maxx*** specify a maximum number of (cell) rows and columns to use, respectively. Passing 0 means "use as much space as is necessary". It is an error to pass a negative number for either. # 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. **ncdirect_check_pixel_support** returns -1 on error, 0 if there is no pixel support, and 1 if pixel support is successfully detected. **ncdirect_styles** returns the current styling, a bitmask over the various **NCSTYLE_** constants. All other functions return 0 on success, and non-zero on error. # NOTES You are recommended to accept **-v** and **-vv** as command-line options, mapping them to **NCDIRECT_OPTION_VERBOSE** and **NCDIRECT_OPTION_VERY_VERBOSE** respectively. # SEE ALSO **getenv(3)**, **readline(3)** **notcurses(3)**, **notcurses_plane(3)**, **notcurses_visual(3)**, **terminfo(5)**, **termios(3)**