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142 lines
5.4 KiB
Markdown
142 lines
5.4 KiB
Markdown
% ncdirect_init(3)
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% nick black <nickblack@linux.com>
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% v2.0.2
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# NAME
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ncdirect_init - minimal notcurses instances for styling text
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# SYNOPSIS
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**#include <notcurses/direct.h>**
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**struct ncdirect* ncdirect_init(const char* termtype, FILE* fp, uint64_t flags);**
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**unsigned ncdirect_palette_size(const struct ncdirect* nc);**
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**int ncdirect_bg_rgb8(struct ncdirect* nc, unsigned r, unsigned g, unsigned b);**
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**int ncdirect_fg_rgb8(struct ncdirect* nc, unsigned r, unsigned g, unsigned b);**
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**int ncdirect_fg_rgb(struct ncdirect* nc, unsigned rgb);**
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**int ncdirect_bg_rgb(struct ncdirect* nc, unsigned rgb);**
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**int ncdirect_fg_default(struct ncdirect* nc);**
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**int ncdirect_bg_default(struct ncdirect* nc);**
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**int ncdirect_dim_x(const struct ncdirect* nc);**
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**int ncdirect_dim_y(const struct ncdirect* nc);**
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**int ncdirect_styles_set(struct ncdirect* n, unsigned stylebits);**
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**int ncdirect_styles_on(struct ncdirect* n, unsigned stylebits);**
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**int ncdirect_styles_off(struct ncdirect* n, unsigned stylebits);**
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**int ncdirect_clear(struct ncdirect* nc)**
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**int ncdirect_stop(struct ncdirect* nc);**
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**int ncdirect_cursor_move_yx(struct ncdirect* n, int y, int x);**
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**int ncdirect_cursor_enable(struct ncdirect* nc);**
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**int ncdirect_cursor_disable(struct ncdirect* nc);**
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**int ncdirect_cursor_up(struct ncdirect* nc, int num);**
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**int ncdirect_cursor_left(struct ncdirect* nc, int num);**
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**int ncdirect_cursor_right(struct ncdirect* nc, int num);**
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**int ncdirect_cursor_down(struct ncdirect* nc, int num);**
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**int ncdirect_putstr(struct ncdirect* nc, uint64_t channels, const char* utf8);**
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**int ncdirect_printf_aligned(struct ncdirect* n, int y, ncalign_e align, const char* fmt, ...);**
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**bool ncdirect_canopen_images(const struct ncdirect* n);**
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**bool ncdirect_canutf8(const struct ncdirect* n);**
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**int ncdirect_hline_interp(struct ncdirect* n, const char* egc, int len, uint64_t h1, uint64_t h2);**
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**int ncdirect_vline_interp(struct ncdirect* n, const char* egc, int len, uint64_t h1, uint64_t h2);**
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**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);**
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**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);**
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**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);**
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**int ncdirect_render_image(struct ncdirect* n, const char* filename, ncblitter_e blitter, ncscale_e scale);**
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# DESCRIPTION
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**ncdirect_init** prepares the **FILE** provided as **fp** for colorizing and
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styling. On success, a pointer to a valid **struct ncdirect** is returned.
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**NULL** is returned on failure. Before the process exits, **ncdirect_stop**
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should be called to reset the terminal and free up resources. **ncdirect_init**
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places the terminal into "cbreak" (also known as "rare") mode, disabling
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line-buffering and echo of input. **ncdirect_stop** restores the terminal state
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as it was when the corresponding **ncdirect_init** call was made.
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The following flags are defined:
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* **NCDIRECT_OPTION_INHIBIT_SETLOCALE**: Unless this flag is set,
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**ncdirect_init** will call **setlocale(LC_ALL, NULL)**. If the result is
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either "**C**" or "**POSIX**", it will print a diagnostic to **stderr**, and
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then call **setlocale(LC_ALL, "").** This will attempt to set the locale
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based off the **LANG** environment variable. Your program should call
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**setlocale(3)** itself, usually as one of the first lines.
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* **NCDIRECT_OPTION_INHIBIT_CBREAK**: Unless this flag is set, **ncdirect_init**
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will place the terminal into cbreak mode (i.e. disabling echo and line
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buffering; see **tcgetattr(3)**).
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An appropriate **terminfo(5)** entry must exist for the terminal. This entry is
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usually selected using the value of the **TERM** environment variable (see
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**getenv(3)**), but a non-**NULL** value for **termtype** will override this. An
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invalid terminfo specification can lead to reduced performance, reduced
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display capabilities, and/or display errors. notcurses natively targets
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24bpp/8bpc RGB color, and it is thus desirable to use a terminal with the
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**rgb** capability (e.g. xterm's **xterm-direct**).
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**ncdirect_dim_x** returns the current number of columns, and **ncdirect_dim_y**
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the current number of rows.
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**ncdirect_clear** clears the screen using a control code if one exists in
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terminfo. Otherwise, it prints successive newlines to scroll everything off.
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**ncdirect_cursor_move_yx** moves the cursor to the specified coordinate. -1 can
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be specified for either **y** or **x** to leave that axis unchanged.
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**ncdirect_enable_cursor** and **ncdirect_disable_cursor** always flush the
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output stream, taking effect immediately.
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**ncdirect_cursor_up** and friends all move relative to the current position.
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Attempting to e.g. move up while on the top row will return 0, but have no
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effect.
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# RETURN VALUES
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**ncdirect_init** returns **NULL** on failure. Otherwise, the return value
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points to a valid **struct ncdirect**, which can be used until it is provided
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to **ncdirect_stop**.
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**ncdirect_putstr** and **ncdirect_printf_aligned** return the number of bytes
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written on success. On failure, they return some negative number.
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All other functions return 0 on success, and non-zero on error.
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# SEE ALSO
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**getenv(3)**,
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**termios(3)**,
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**notcurses(3)**,
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**notcurses_plane(3)**,
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**terminfo(5)**
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