notcurses_direct - Man Page

minimal notcurses instances for styling text

Synopsis

#include <notcurses/direct.h>

#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_putegc(struct ncdirect* nc, uint64_t channels, const char* utf8, int* sbytes);

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);

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:

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 reads a (heap-allocated) line of arbitrary length, supporting some libreadline-style line-editing controls. NCDIRECT_OPTION_INHIBIT_CBREAK should not be used if you intend to use ncdirect_readline; if used, line-editing keybindings cannot be implemented. Input will be echoed whether this option is used or not.

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_putegc returns the number of columns consumed on success, or -1 on failure. If sbytes is not NULL, the number of bytes consumed will be written to it.

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), notcurses(3), notcurses_plane(3), notcurses_visual(3), terminfo(5), termios(3)

Authors

nick black <nickblack@linux.com>.

Referenced By

ncdirect-pydemo(1), ncplayer(1), notcurses(3), notcurses_core(3).

v2.4.4