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% notcurses_ncplane(3)
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% nick black <nickblack@linux.com>
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% v1.2.4
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# NAME
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notcurses_ncplane - operations on notcurses planes
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# SYNOPSIS
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**#include <notcurses.h>**
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**struct ncplane* ncplane_new(struct notcurses* nc, int rows, int cols, int yoff, int xoff, void* opaque);**
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**struct ncplane* ncplane_bound(struct ncplane* n, int rows, int cols, int yoff, int xoff, void* opaque);**
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**struct ncplane* ncplane_reparent(struct ncplane* n, struct ncplane* newparent);**
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**struct ncplane* ncplane_aligned(struct ncplane* n, int rows, int cols, int yoff, ncalign_e align, void* opaque);**
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**struct ncplane* ncplane_dup(struct ncplane* n, void* opaque);**
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**int ncplane_resize(struct ncplane* n, int keepy, int keepx, int keepleny, int keeplenx, int yoff, int xoff, int ylen, int xlen);**
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**int ncplane_move_yx(struct ncplane* n, int y, int x);**
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**void ncplane_yx(const struct ncplane* n, int* restrict y, int* restrict x);**
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**int ncplane_set_base_cell(struct ncplane* ncp, const cell* c);**
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**int ncplane_set_base(struct ncplane* ncp, uint64_t channels, uint32_t attrword, const char* egc);**
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**int ncplane_base(struct ncplane* ncp, cell* c);**
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**int ncplane_move_top(struct ncplane* n);**
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**int ncplane_move_bottom(struct ncplane* n);**
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**int ncplane_move_above(struct ncplane* n, struct ncplane* above);**
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**int ncplane_move_below(struct ncplane* n, struct ncplane* below);**
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**struct ncplane* ncplane_below(struct ncplane* n);**
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**int ncplane_at_cursor(struct ncplane* n, cell* c);**
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**int ncplane_at_yx(struct ncplane* n, int y, int x, cell* c);**
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**void* ncplane_set_userptr(struct ncplane* n, void* opaque);**
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**void* ncplane_userptr(struct ncplane* n);**
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**void ncplane_dim_yx(const struct ncplane* n, int* restrict rows, int* restrict cols);**
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**static inline int ncplane_dim_y(const struct ncplane* n);**
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**static inline int ncplane_dim_x(const struct ncplane* n);**
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**void ncplane_cursor_yx(const struct ncplane* n, int* restrict y, int* restrict x);**
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**void ncplane_translate(const struct ncplane* src, const struct ncplane* dst, int* restrict y, int* restrict x);**
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**bool ncplane_translate_abs(const struct ncplane* n, int* restrict y, int* restrict x);**
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**uint64_t ncplane_channels(struct ncplane* n);**
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**uint32_t ncplane_attr(struct ncplane* n);**
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**static inline unsigned ncplane_bchannel(struct ncplane* nc);**
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**static inline unsigned ncplane_fchannel(struct ncplane* nc);**
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**static inline unsigned ncplane_fg(struct ncplane* nc);**
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**static inline unsigned ncplane_bg(struct ncplane* nc);**
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**static inline unsigned ncplane_fg_alpha(struct ncplane* nc);**
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**static inline unsigned ncplane_bg_alpha(struct ncplane* nc);**
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**static inline unsigned ncplane_fg_rgb(struct ncplane* n, unsigned* r, unsigned* g, unsigned* b);**
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**static inline unsigned ncplane_bg_rgb(struct ncplane* n, unsigned* r, unsigned* g, unsigned* b);**
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**int ncplane_set_fg_rgb(struct ncplane* n, int r, int g, int b);**
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**int ncplane_set_bg_rgb(struct ncplane* n, int r, int g, int b);**
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**void ncplane_set_fg_rgb_clipped(struct ncplane* n, int r, int g, int b);**
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**void ncplane_set_bg_rgb_clipped(struct ncplane* n, int r, int g, int b);**
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**int ncplane_set_fg(struct ncplane* n, unsigned channel);**
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**int ncplane_set_bg(struct ncplane* n, unsigned channel);**
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**void ncplane_set_fg_default(struct ncplane* n);**
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**void ncplane_set_bg_default(struct ncplane* n);**
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**int ncplane_set_fg_alpha(struct ncplane* n, int alpha);**
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**int ncplane_set_bg_alpha(struct ncplane* n, int alpha);**
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**int ncplane_set_fg_palindex(struct ncplane* n, int idx);**
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**int ncplane_set_bg_palindex(struct ncplane* n, int idx);**
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**void ncplane_styles_set(struct ncplane* n, unsigned stylebits);**
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**void ncplane_styles_on(struct ncplane* n, unsigned stylebits);**
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**void ncplane_styles_off(struct ncplane* n, unsigned stylebits);**
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**unsigned ncplane_styles(const struct ncplane* n);**
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**void ncplane_greyscale(struct ncplane* n);**
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**int ncblit_bgrx(struct ncplane* nc, int placey, int placex, int linesize, const unsigned char* data, int begy, int begx, int leny, int lenx);**
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**int ncblit_rgba(struct ncplane* nc, int placey, int placex, int linesize, const unsigned char* data, int begy, int begx, int leny, int lenx);**
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**int ncplane_rotate_cw(struct ncplane* n);**
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**int ncplane_rotate_ccw(struct ncplane* n);**
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**int ncplane_destroy(struct ncplane* ncp);**
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**void notcurses_drop_planes(struct notcurses* nc);**
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**int ncplane_mergedown(struct ncplane* restrict src, struct ncplane* restrict dst);**
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**void ncplane_erase(struct ncplane* n);**
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## DESCRIPTION
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Ncplanes are the fundamental drawing object of notcurses. All output functions
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take a **struct ncplane** as an argument. They can be any size, and placed
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anywhere. In addition to its framebuffer--a rectilinear matrix of cells
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(see **notcurses_cell(3)**)--an ncplane is defined by:
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* a base cell, used for any cell on the plane without a glyph,
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* the egcpool backing its cells,
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* a current cursor location,
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* a current style, foreground channel, and background channel,
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* its geometry,
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* a configured user pointer,
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* its position relative to the visible plane, and
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* its z-index.
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New planes can be created with **ncplane_new**, **ncplane_bound**, and
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**ncplane_aligned**. If a plane is bound to another, x and y coordinates are
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relative to the plane to which it is bound, and if that plane moves, all its
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bound planes move along with it. When a plane is destroyed, all planes bound to
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it (directly or transitively) are destroyed. **ncplane_reparent** detaches the
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plane **n** from any plane to which it is bound, and binds it to **newparent**
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if **newparent** is not **NULL**. All planes bound to **n** move along with it
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during a reparenting operation.
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**ncplane_destroy** destroys a particular ncplane, after which it must not be
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used again. **notcurses_drop_planes** destroys all ncplanes other than the
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stdplane. Any references to such planes are, of course, invalidated. It is
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undefined to destroy a plane concurrently with any other operation involving
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that plane, or any operation involving the z-axis.
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It is an error for two threads to concurrently mutate a single ncplane. So long
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as rendering is not taking place, however, multiple threads may safely output
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to multiple ncplanes. So long as all threads are readers, multiple threads may
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work with a single ncplane. A reading function is any which accepts a **const
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struct ncplane**.
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**ncplane_translate** translates coordinates expressed relative to the plane
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**src**, and writes the coordinates of that cell relative to **dst**. The cell
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need not intersect with **dst**, though this will yield coordinates which are
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invalid for writing or reading on **dst**. If **dst** is **NULL**, it is taken
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to refer to the standard plane. **ncplane_translate_abs** takes coordinates
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expressed relative to the standard plane, and returns coordinates relative to
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**dst**, returning **false** if the coordinates are invalid for **dst**.
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**ncplane_mergedown** writes to **dst** the frame that would be rendered if only
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**src** and **dst** existed on the z-axis, ad **dst** represented the entirety
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of the rendering region. Only those cells where **src** intersects with **dst**
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might see changes. It is an error to merge a plane onto itself.
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# RETURN VALUES
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**ncplane_new**, **ncplane_bound**, **ncplane_aligned**, and **ncplane_dup**
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all return a new **struct ncplane** on success, or **NULL** on failure.
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**ncplane_userptr** returns the configured user pointer for the ncplane, and
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cannot fail.
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**ncplane_below** returns the plane below the specified ncplane. If the provided
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plane is the bottommost plane, NULL is returned. It cannot fail.
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Functions returning **int** return 0 on success, and non-zero on error.
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All other functions cannot fail (and return **void**).
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# NOTES
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# SEE ALSO
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**notcurses(3)**, **notcurses_cell(3)**, **notcurses_output(3)**,
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**notcurses_stdplane(3)**
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