|
|
|
% notcurses_cell(3)
|
|
|
|
% nick black <nickblack@linux.com>
|
|
|
|
% v2.1.7
|
|
|
|
|
|
|
|
# NAME
|
|
|
|
|
|
|
|
notcurses_cell - operations on nccell objects
|
|
|
|
|
|
|
|
# SYNOPSIS
|
|
|
|
|
|
|
|
**#include <notcurses/notcurses.h>**
|
|
|
|
|
|
|
|
```c
|
|
|
|
// See DESCRIPTION below for information on EGC encoding
|
|
|
|
typedef struct nccell {
|
|
|
|
uint32_t gcluster; // 4B → 4B
|
|
|
|
uint8_t gcluster_backstop; // 1B → 5B (8 bits of zero)
|
|
|
|
uint8_t width; // 1B → 6B (8 bits of column width)
|
|
|
|
uint16_t stylemask; // 2B → 8B (16 bits of NCSTYLE_* attributes)
|
|
|
|
uint64_t channels;
|
|
|
|
} nccell;
|
|
|
|
|
|
|
|
#define CELL_TRIVIAL_INITIALIZER \
|
|
|
|
{ .gcluster = '\0', .stylemask = 0, .channels = 0, }
|
|
|
|
#define CELL_SIMPLE_INITIALIZER(c) \
|
|
|
|
{ .gcluster = (c), .stylemask = 0, .channels = 0, }
|
|
|
|
#define CELL_INITIALIZER(c, s, chan) \
|
|
|
|
{ .gcluster = (c), .stylemask = (s), .channels = (chan), }
|
|
|
|
|
|
|
|
#define CELL_BGDEFAULT_MASK 0x0000000040000000ull
|
|
|
|
#define CELL_FGDEFAULT_MASK (CELL_BGDEFAULT_MASK << 32u)
|
|
|
|
#define CELL_BG_RGB_MASK 0x0000000000ffffffull
|
|
|
|
#define CELL_FG_RGB_MASK (CELL_BG_MASK << 32u)
|
|
|
|
#define CELL_BG_PALETTE 0x0000000008000000ull
|
|
|
|
#define CELL_FG_PALETTE (CELL_BG_PALETTE << 32u)
|
|
|
|
#define CHANNEL_ALPHA_MASK 0x30000000ull
|
|
|
|
#define CELL_ALPHA_HIGHCONTRAST 0x30000000ull
|
|
|
|
#define CELL_ALPHA_TRANSPARENT 0x2.1.7000ull
|
|
|
|
#define CELL_ALPHA_BLEND 0x10000000ull
|
|
|
|
#define CELL_ALPHA_OPAQUE 0x00000000ull
|
|
|
|
```
|
|
|
|
|
|
|
|
**void cell_init(nccell* ***c***);**
|
|
|
|
|
|
|
|
**int cell_load(struct ncplane* ***n***, nccell* ***c***, const char* ***gcluster***);**
|
|
|
|
|
|
|
|
**int cell_prime(struct ncplane* ***n***, nccell* ***c***, const char* ***gcluster***,
|
|
|
|
uint32_t ***stylemask***, uint64_t ***channels***);**
|
|
|
|
|
|
|
|
**int cell_duplicate(struct ncplane* ***n***, nccell* ***targ***, const nccell* ***c***);**
|
|
|
|
|
|
|
|
**void cell_release(struct ncplane* ***n***, nccell* ***c***);**
|
|
|
|
|
|
|
|
**void cell_styles_set(nccell* ***c***, unsigned ***stylebits***);**
|
|
|
|
|
|
|
|
**unsigned cell_styles(const nccell* ***c***);**
|
|
|
|
|
|
|
|
**void cell_on_styles(nccell* ***c***, unsigned ***stylebits***);**
|
|
|
|
|
|
|
|
**void cell_off_styles(nccell* ***c***, unsigned ***stylebits***);**
|
|
|
|
|
|
|
|
**void cell_set_fg_default(nccell* ***c***);**
|
|
|
|
|
|
|
|
**void cell_set_bg_default(nccell* ***c***);**
|
|
|
|
|
|
|
|
**int cell_set_fg_alpha(nccell* ***c***, unsigned ***alpha***);**
|
|
|
|
|
|
|
|
**int cell_set_bg_alpha(nccell* ***c***, unsigned ***alpha***);**
|
|
|
|
|
|
|
|
**bool cell_double_wide_p(const nccell* ***c***);**
|
|
|
|
|
|
|
|
**const char* cell_extended_gcluster(const struct ncplane* ***n***, const nccell* ***c***);**
|
|
|
|
|
|
|
|
**char* cell_strdup(const struct ncplane* ***n***, const nccell* ***c***);**
|
|
|
|
|
|
|
|
**int cell_load_char(struct ncplane* ***n***, nccell* ***c***, char ***ch***);**
|
|
|
|
|
|
|
|
**int cell_load_egc32(struct ncplane* ***n***, nccell* ***c***, uint32_t ***egc***);**
|
|
|
|
|
|
|
|
**char* cell_extract(const struct ncplane* ***n***, const nccell* ***c***, uint16_t* ***stylemask***, uint64_t* ***channels***);**
|
|
|
|
|
|
|
|
**uint32_t cell_bchannel(const nccell* ***c***);**
|
|
|
|
|
|
|
|
**uint32_t cell_fchannel(const nccell* ***c***);**
|
|
|
|
|
|
|
|
**uint64_t cell_set_bchannel(nccell* ***c***, uint32_t ***channel***);**
|
|
|
|
|
|
|
|
**uint64_t cell_set_fchannel(nccell* ***c***, uint32_t ***channel***);**
|
|
|
|
|
|
|
|
**uint32_t cell_fg_rgb(const nccell* ***c***);**
|
|
|
|
|
|
|
|
**uint32_t cell_bg_rgb(const nccell* ***c***);**
|
|
|
|
|
|
|
|
**unsigned cell_fg_alpha(const nccell* ***c***);**
|
|
|
|
|
|
|
|
**unsigned cell_bg_alpha(const nccell* ***c***);**
|
|
|
|
|
|
|
|
**unsigned cell_fg_rgb8(const nccell* ***c***, unsigned* ***r***, unsigned* ***g***, unsigned* ***b***);**
|
|
|
|
|
|
|
|
**unsigned cell_bg_rgb8(const ncell* ***c***, unsigned* ***r***, unsigned* ***g***, unsigned* ***b***);**
|
|
|
|
|
|
|
|
**int cell_set_fg_rgb8(nccell* ***c***, int ***r***, int ***g***, int ***b***);**
|
|
|
|
|
|
|
|
**int cell_set_bg_rgb8(nccell* ***c***, int ***r***, int ***g***, int ***b***);**
|
|
|
|
|
|
|
|
**void cell_set_fg_rgb8_clipped(nccell* ***c***, int ***r***, int ***g***, int ***b***);**
|
|
|
|
|
|
|
|
**void cell_set_bg_rgb8_clipped(nccell* ***c***, int ***r***, int ***g***, int ***b***);**
|
|
|
|
|
|
|
|
**int cell_set_fg_rgb(nccell* ***c***, uint32_t ***channel***);**
|
|
|
|
|
|
|
|
**int cell_set_bg_rgb(nccell* ***c***, uint32_t ***channel***);**
|
|
|
|
|
|
|
|
**bool cell_fg_default_p(const nccell* ***c***);**
|
|
|
|
|
|
|
|
**bool cell_bg_default_p(const nccell* ***c***);**
|
|
|
|
|
|
|
|
**int ncstrwidth(const char* ***text***)**;
|
|
|
|
|
|
|
|
# DESCRIPTION
|
|
|
|
|
|
|
|
Cells make up the framebuffer associated with each plane, with one cell per
|
|
|
|
addressable coordinate. You should not usually need to interact directly
|
|
|
|
with **nccell**s.
|
|
|
|
|
|
|
|
Each **nccell** contains exactly one extended grapheme cluster. If the EGC
|
|
|
|
is encoded in UTF-8 with four or fewer bytes (all Unicode codepoints as of
|
|
|
|
Unicode 13 can be encoded in no more than four UTF-8 bytes), it is encoded
|
|
|
|
directly into the **nccell**'s **gcluster** field, and no additional storage
|
|
|
|
is necessary. Otherwise, the EGC is stored as a nul-terminated UTF-8 string in
|
|
|
|
some backing egcpool. Egcpools are associated with **ncplane**s, so **nccell**s
|
|
|
|
must be considered associated with **ncplane**s. Indeed, **ncplane_erase()**
|
|
|
|
destroys the backing storage for all a plane's cells, invalidating them. This
|
|
|
|
association is formed at the time of **cell_load()**, **cell_prime()**, or
|
|
|
|
**cell_duplicate()**. All of these functions first call **cell_release()**, as
|
|
|
|
does **cell_load_simple()**. When done using a **nccell** entirely, call
|
|
|
|
**cell_release()**. **ncplane_destroy()** will free up the memory used by the
|
|
|
|
**nccell**, but the backing egcpool has a maximum size of 16MiB, and failure to
|
|
|
|
release **nccell**s can eventually block new output.
|
|
|
|
|
|
|
|
**cell_extended_gcluster** provides a nul-terminated handle to the EGC. This
|
|
|
|
ought be considered invalidated by changes to the **nccell** or **egcpool**.
|
|
|
|
The handle is **not** heap-allocated; do **not** attempt to **free(3)** it.
|
|
|
|
A heap-allocated copy can be acquired with **cell_strdup**.
|
|
|
|
|
|
|
|
# RETURN VALUES
|
|
|
|
|
|
|
|
**cell_load()** and similar functions return the number of bytes loaded from the
|
|
|
|
EGC, or -1 on failure. They can fail due to either an invalid UTF-8 input, or the
|
|
|
|
backing egcpool reaching its maximum size.
|
|
|
|
|
|
|
|
**cell_set_fg_rgb8()** and similar functions will return -1 if provided invalid
|
|
|
|
inputs, and 0 otherwise.
|
|
|
|
|
|
|
|
# NOTES
|
|
|
|
|
|
|
|
**cell** was renamed to **nccell** in Notcurses 2.1.7, so as not to bleed such
|
|
|
|
a common term into the (single, global) C namespace. **cell** will be retained
|
|
|
|
as an alias until Notcurses 3.0.
|
|
|
|
|
|
|
|
# SEE ALSO
|
|
|
|
|
|
|
|
**notcurses(3)**,
|
|
|
|
**notcurses_channels(3)**,
|
|
|
|
**notcurses_plane(3)**,
|
|
|
|
**notcurses_output(3)**
|