mirror of
https://github.com/dankamongmen/notcurses.git
synced 2024-11-08 01:10:23 +00:00
156 lines
4.9 KiB
Markdown
156 lines
4.9 KiB
Markdown
% notcurses_cell(3)
|
|
% nick black <nickblack@linux.com>
|
|
% v1.2.8
|
|
|
|
# NAME
|
|
|
|
notcurses_cell - operations on notcurses cells
|
|
|
|
# SYNOPSIS
|
|
|
|
**#include <notcurses.h>**
|
|
|
|
```c
|
|
// See DESCRIPTION below for information on EGC encoding
|
|
typedef struct cell {
|
|
uint32_t gcluster;
|
|
uint32_t attrword;
|
|
uint64_t channels;
|
|
} cell;
|
|
|
|
#define CELL_TRIVIAL_INITIALIZER \
|
|
{ .gcluster = '\0', .attrword = 0, .channels = 0, }
|
|
#define CELL_SIMPLE_INITIALIZER(c) \
|
|
{ .gcluster = (c), .attrword = 0, .channels = 0, }
|
|
#define CELL_INITIALIZER(c, a, chan) \
|
|
{ .gcluster = (c), .attrword = (a), .channels = (chan), }
|
|
|
|
#define CELL_WIDEASIAN_MASK 0x8000000080000000ull
|
|
#define CELL_BGDEFAULT_MASK 0x0000000040000000ull
|
|
#define CELL_FGDEFAULT_MASK (CELL_BGDEFAULT_MASK << 32u)
|
|
#define CELL_BG_MASK 0x0000000000ffffffull
|
|
#define CELL_FG_MASK (CELL_BG_MASK << 32u)
|
|
#define CELL_BG_PALETTE 0x0000000008000000ull
|
|
#define CELL_FG_PALETTE (CELL_BG_PALETTE << 32u)
|
|
#define CELL_ALPHA_MASK 0x0000000030000000ull
|
|
#define CELL_ALPHA_SHIFT 28u
|
|
#define CELL_ALPHA_HIGHCONTRAST 3
|
|
#define CELL_ALPHA_TRANSPARENT 2
|
|
#define CELL_ALPHA_BLEND 1
|
|
#define CELL_ALPHA_OPAQUE 0
|
|
```
|
|
|
|
**void cell_init(cell* c);**
|
|
|
|
**int cell_load(struct ncplane* n, cell* c, const char* gcluster);**
|
|
|
|
**int cell_prime(struct ncplane* n, cell* c, const char* gcluster,
|
|
uint32_t attr, uint64_t channels);**
|
|
|
|
**int cell_duplicate(struct ncplane* n, cell* targ, const cell* c);**
|
|
|
|
**void cell_release(struct ncplane* n, cell* c);**
|
|
|
|
**void cell_styles_set(cell* c, unsigned stylebits);**
|
|
|
|
**unsigned cell_styles(const cell* c);**
|
|
|
|
**void cell_styles_on(cell* c, unsigned stylebits);**
|
|
|
|
**void cell_styles_off(cell* c, unsigned stylebits);**
|
|
|
|
**void cell_set_fg_default(cell* c);**
|
|
|
|
**void cell_set_bg_default(cell* c);**
|
|
|
|
**int cell_set_fg_alpha(cell* c, int alpha);**
|
|
|
|
**int cell_set_bg_alpha(cell* c, int alpha);**
|
|
|
|
**bool cell_double_wide_p(const cell* c);**
|
|
|
|
**bool cell_simple_p(const cell* c);**
|
|
|
|
**const char* cell_extended_gcluster(const struct ncplane* n, const cell* c);**
|
|
|
|
**bool cell_noforeground_p(const cell* c);**
|
|
|
|
**int cell_load_simple(struct ncplane* n, cell* c, char ch);**
|
|
|
|
**uint32_t cell_egc_idx(const cell* c);**
|
|
|
|
**unsigned cell_bchannel(const cell* cl);**
|
|
|
|
**unsigned cell_fchannel(const cell* cl);**
|
|
|
|
**uint64_t cell_set_bchannel(cell* cl, uint32_t channel);**
|
|
|
|
**uint64_t cell_set_fchannel(cell* cl, uint32_t channel);**
|
|
|
|
**uint64_t cell_blend_fchannel(cell* cl, unsigned channel, unsigned blends)**
|
|
|
|
**uint64_t cell_blend_bchannel(cell* cl, unsigned channel, unsigned blends)**
|
|
|
|
**unsigned cell_fg(const cell* cl);**
|
|
|
|
**unsigned cell_bg(const cell* cl);**
|
|
|
|
**unsigned cell_fg_alpha(const cell* cl);**
|
|
|
|
**unsigned cell_bg_alpha(const cell* cl);**
|
|
|
|
**unsigned cell_fg_rgb(const cell* cl, unsigned* r, unsigned* g, unsigned* b);**
|
|
|
|
**unsigned cell_bg_rgb(const cell* cl, unsigned* r, unsigned* g, unsigned* b);**
|
|
|
|
**int cell_set_fg_rgb(cell* cl, int r, int g, int b);**
|
|
|
|
**int cell_set_bg_rgb(cell* cl, int r, int g, int b);**
|
|
|
|
**void cell_set_fg_rgb_clipped(cell* cl, int r, int g, int b);**
|
|
|
|
**void cell_set_bg_rgb_clipped(cell* cl, int r, int g, int b);**
|
|
|
|
**int cell_set_fg(cell* c, uint32_t channel);**
|
|
|
|
**int cell_set_bg(cell* c, uint32_t channel);**
|
|
|
|
**bool cell_fg_default_p(const cell* cl);**
|
|
|
|
**bool cell_bg_default_p(const cell* cl);**
|
|
|
|
# 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 cells.
|
|
|
|
Each **cell** contains exactly one extended grapheme cluster. If the EGC happens
|
|
to be a single ASCII character, i.e. a single character with a value less than
|
|
128, it is encoded directly into the **cell**'s **gcluster** field, and no
|
|
additional storage is necessary. In this case, **cell_simple_p()** is **true**.
|
|
Otherwise, the EGC is stored as a UTF-8 string in some backing egcpool. Egcpools
|
|
are associated with **ncplane**s, so **cell**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 **cell** entirely, call **cell_release()**. **ncplane_destroy()**
|
|
will free up the memory used by the **cell**, but the backing egcpool has a
|
|
maximum size of 16MiB, and failure to release **cell**s can eventually block new
|
|
output.
|
|
|
|
# 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_rgb()** and similar functions will return -1 if provided invalid
|
|
inputs, and 0 otherwise.
|
|
|
|
# SEE ALSO
|
|
|
|
**notcurses(3)**, **notcurses_channels(3)**, **notcurses_ncplane(3)**,
|
|
**notcurses_output(3)**
|