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notcurses/include/notcurses.h
nick black 1fd0563093
Direct mode with its own type #77 
Introduce the new type 'ncdirect', a stripped-down 'notcurses'
suitable for inline modification of regular output. Used the new
type because otherwise there were going to be if(directmode) checks
everywhere. Direct mode encompasses only colorizing and styling.
Add new man page notcurses_directmode(3). Add new section to README.
Add new PoC using direct mode RGB. Update demo table summary to use
direct mode.
2020-01-25 01:13:04 -05:00

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#ifndef NOTCURSES_NOTCURSES
#define NOTCURSES_NOTCURSES
#include <time.h>
#include <uchar.h>
#include <ctype.h>
#include <wchar.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <signal.h>
#include <limits.h>
#include <stdbool.h>
#ifdef __cplusplus
extern "C" {
#define RESTRICT
#else
#define RESTRICT restrict
#endif
#define API __attribute__((visibility("default")))
// Get a human-readable string describing the running notcurses version.
API const char* notcurses_version(void);
struct cell; // a coordinate on an ncplane: an EGC plus styling
struct ncplane; // a drawable notcurses surface, composed of cells
struct ncvisual; // a visual bit of multimedia opened with LibAV
struct notcurses; // notcurses state for a given terminal, composed of ncplanes
#define NCPALETTESIZE 256
// A cell corresponds to a single character cell on some plane, which can be
// occupied by a single grapheme cluster (some root spacing glyph, along with
// possible combining characters, which might span multiple columns). At any
// cell, we can have a theoretically arbitrarily long UTF-8 string, a foreground
// color, a background color, and an attribute set. Valid grapheme cluster
// contents include:
//
// * A NUL terminator,
// * A single control character, followed by a NUL terminator,
// * At most one spacing character, followed by zero or more nonspacing
// characters, followed by a NUL terminator.
//
// Multi-column characters can only have a single style/color throughout.
// Existence is suffering, and thus wcwidth() is not reliable. It's just
// quoting whether or not the EGC contains a "Wide Asian" double-width
// character. This is set for some things, like most emoji, and not set for
// other things, like cuneiform. Fucccccck. True display width is a *property
// of the font*. Fuccccccccckkkkk. Among the longest Unicode codepoints is
//
// U+FDFD ARABIC LIGATURE BISMILLAH AR-RAHMAN AR-RAHEEM ﷽
//
// wcwidth() rather optimistically claims this suicide bomber of a glyph to
// occupy a single column, right before it explodes in your diner. BiDi text
// is too complicated for me to even get into here. It sucks ass. Be assured
// there are no easy answers. Allah, the All-Powerful, has fucked us again!
//
// Each cell occupies 16 static bytes (128 bits). The surface is thus ~1.6MB
// for a (pretty large) 500x200 terminal. At 80x43, it's less than 64KB.
// Dynamic requirements (the egcpool) can add up to 32MB to an ncplane, but
// such large pools are unlikely in common use.
//
// We implement some small alpha compositing. Foreground and background both
// have two bits of inverted alpha. The actual grapheme written to a cell is
// the topmost non-zero grapheme. If its alpha is 00, its foreground color is
// used unchanged. If its alpha is 10, its foreground color is derived entirely
// from cells underneath it. Otherwise, the result will be a composite.
// Likewise for the background. If the bottom of a coordinate's zbuffer is
// reached with a cumulative alpha of zero, the default is used. In this way,
// a terminal configured with transparent background can be supported through
// multiple occluding ncplanes. A foreground alpha of 11 requests high-contrast
// text (relative to the computed background). A background alpha of 11 is
// currently forbidden.
//
// Default color takes precedence over palette or RGB, and cannot be used with
// transparency. Indexed palette takes precedence over RGB. It cannot
// meaningfully set transparency, but it can be mixed into a cascading color.
// RGB is used if neither default terminal colors nor palette indexing are in
// play, and fully supports all transparency options.
typedef struct cell {
// These 32 bits are either a single-byte, single-character grapheme cluster
// (values 0--0x7f), or an offset into a per-ncplane attached pool of
// varying-length UTF-8 grapheme clusters. This pool may thus be up to 32MB.
uint32_t gcluster; // 4B -> 4B
// CELL_STYLE_* attributes (16 bits) + 8 foreground palette index bits + 8
// background palette index bits. palette index bits are used only if the
// corresponding default color bit *is not* set, and the corresponding
// palette index bit *is* set.
uint32_t attrword; // + 4B -> 8B
// (channels & 0x8000000000000000ull): left half of wide character
// (channels & 0x4000000000000000ull): foreground is *not* "default color"
// (channels & 0x3000000000000000ull): foreground alpha (2 bits)
// (channels & 0x0800000000000000ull): foreground uses palette index
// (channels & 0x0700000000000000ull): reserved, must be 0
// (channels & 0x00ffffff00000000ull): foreground in 3x8 RGB (rrggbb)
// (channels & 0x0000000080000000ull): right half of wide character
// (channels & 0x0000000040000000ull): background is *not* "default color"
// (channels & 0x0000000030000000ull): background alpha (2 bits)
// (channels & 0x0000000008000000ull): background uses palette index
// (channels & 0x0000000007000000ull): reserved, must be 0
// (channels & 0x0000000000ffffffull): background in 3x8 RGB (rrggbb)
// At render time, these 24-bit values are quantized down to terminal
// capabilities, if necessary. There's a clear path to 10-bit support should
// we one day need it, but keep things cagey for now. "default color" is
// best explained by color(3NCURSES). ours is the same concept. until the
// "not default color" bit is set, any color you load will be ignored.
uint64_t channels; // + 8B == 16B
} cell;
// These log levels consciously map cleanly to those of libav; notcurses itself
// does not use this full granularity. The log level does not affect the opening
// and closing banners, which can be disabled via the notcurses_option struct's
// 'suppress_banner'. Note that if stderr is connected to the same terminal on
// which we're rendering, any kind of logging will disrupt the output.
typedef enum {
NCLOGLEVEL_SILENT, // default. print nothing once fullscreen service begins
NCLOGLEVEL_PANIC, // print diagnostics immediately related to crashing
NCLOGLEVEL_FATAL, // we're hanging around, but we've had a horrible fault
NCLOGLEVEL_ERROR, // we can't keep doin' this, but we can do other things
NCLOGLEVEL_WARNING, // you probably don't want what's happening to happen
NCLOGLEVEL_INFO, // "standard information"
NCLOGLEVEL_VERBOSE, // "detailed information"
NCLOGLEVEL_DEBUG, // this is honestly a bit much
NCLOGLEVEL_TRACE, // there's probably a better way to do what you want
} ncloglevel_e;
// Configuration for notcurses_init().
typedef struct notcurses_options {
// The name of the terminfo database entry describing this terminal. If NULL,
// the environment variable TERM is used. Failure to open the terminal
// definition will result in failure to initialize notcurses.
const char* termtype;
// If smcup/rmcup capabilities are indicated, notcurses defaults to making
// use of the "alternate screen". This flag inhibits use of smcup/rmcup.
bool inhibit_alternate_screen;
// By default, we hide the cursor if possible. This flag inhibits use of
// the civis capability, retaining the cursor.
bool retain_cursor;
// Notcurses typically prints version info in notcurses_init() and performance
// info in notcurses_stop(). This inhibits that output.
bool suppress_banner;
// We typically install a signal handler for SIG{INT, SEGV, ABRT, QUIT} that
// restores the screen, and then calls the old signal handler. Set to inhibit
// registration of these signal handlers.
bool no_quit_sighandlers;
// We typically install a signal handler for SIGWINCH that generates a resize
// event in the notcurses_getc() queue. Set to inhibit this handler.
bool no_winch_sighandler;
// If non-NULL, notcurses_render() will write each rendered frame to this
// FILE* in addition to outfp. This is used primarily for debugging.
FILE* renderfp;
// Progressively higher log levels result in more logging to stderr. By
// default, nothing is printed to stderr once fullscreen service begins.
ncloglevel_e loglevel;
} notcurses_options;
// Initialize a notcurses context on the connected terminal at 'fp'. 'fp' must
// be a tty. You'll usually want stdout. Returns NULL on error, including any
// failure initializing terminfo.
API struct notcurses* notcurses_init(const notcurses_options* opts, FILE* fp);
// Initialize a direct-mode notcurses context on the connected terminal at 'fp'.
// 'fp' must be a tty. You'll usually want stdout. Direct mode supportes a
// limited subset of notcurses routines which directly affect 'fp', and neither
// supports nor requires notcurses_render(). This can be used to add color and
// styling to text in the standard output paradigm. Returns NULL on error,
// including any failure initializing terminfo.
API struct ncdirect* notcurses_directmode(const char* termtype, FILE* fp);
// Destroy a notcurses context.
API int notcurses_stop(struct notcurses* nc);
// Make the physical screen match the virtual screen. Changes made to the
// virtual screen (i.e. most other calls) will not be visible until after a
// successful call to notcurses_render().
API int notcurses_render(struct notcurses* nc);
// Return the topmost ncplane, of which there is always at least one.
API struct ncplane* notcurses_top(struct notcurses* n);
// All input is currently taken from stdin, though this will likely change. We
// attempt to read a single UTF8-encoded Unicode codepoint, *not* an entire
// Extended Grapheme Cluster. It is also possible that we will read a special
// keypress, i.e. anything that doesn't correspond to a Unicode codepoint (e.g.
// arrow keys, function keys, screen resize events, etc.). These are mapped
// into Unicode's Supplementary Private Use Area-B, starting at U+100000.
//
// notcurses_getc() and notcurses_getc_nblock() are both nonblocking.
// notcurses_getc_blocking() blocks until a codepoint or special key is read,
// or until interrupted by a signal.
//
// In the case of a valid read, a 32-bit Unicode codepoint is returned. 0 is
// returned to indicate that no input was available, but only by
// notcurses_getc(). Otherwise (including on EOF) (char32_t)-1 is returned.
#define suppuabize(w) ((w) + 0x100000)
// Special composed key defintions. These values are added to 0x100000.
#define NCKEY_INVALID suppuabize(0)
#define NCKEY_RESIZE suppuabize(1) // generated interally in response to SIGWINCH
#define NCKEY_UP suppuabize(2)
#define NCKEY_RIGHT suppuabize(3)
#define NCKEY_DOWN suppuabize(4)
#define NCKEY_LEFT suppuabize(5)
#define NCKEY_INS suppuabize(6)
#define NCKEY_DEL suppuabize(7)
#define NCKEY_BACKSPACE suppuabize(8) // backspace (sometimes)
#define NCKEY_PGDOWN suppuabize(9)
#define NCKEY_PGUP suppuabize(10)
#define NCKEY_HOME suppuabize(11)
#define NCKEY_END suppuabize(12)
#define NCKEY_F00 suppuabize(20)
#define NCKEY_F01 suppuabize(21)
#define NCKEY_F02 suppuabize(22)
#define NCKEY_F03 suppuabize(23)
#define NCKEY_F04 suppuabize(24)
#define NCKEY_F05 suppuabize(25)
#define NCKEY_F06 suppuabize(26)
#define NCKEY_F07 suppuabize(27)
#define NCKEY_F08 suppuabize(28)
#define NCKEY_F09 suppuabize(29)
#define NCKEY_F10 suppuabize(30)
#define NCKEY_F11 suppuabize(31)
#define NCKEY_F12 suppuabize(32)
#define NCKEY_F13 suppuabize(33)
#define NCKEY_F14 suppuabize(34)
#define NCKEY_F15 suppuabize(35)
#define NCKEY_F16 suppuabize(36)
#define NCKEY_F17 suppuabize(37)
#define NCKEY_F18 suppuabize(38)
#define NCKEY_F19 suppuabize(39)
#define NCKEY_F20 suppuabize(40)
#define NCKEY_F21 suppuabize(41)
#define NCKEY_F22 suppuabize(42)
#define NCKEY_F23 suppuabize(43)
#define NCKEY_F24 suppuabize(44)
#define NCKEY_F25 suppuabize(45)
#define NCKEY_F26 suppuabize(46)
#define NCKEY_F27 suppuabize(47)
#define NCKEY_F28 suppuabize(48)
#define NCKEY_F29 suppuabize(49)
#define NCKEY_F30 suppuabize(50)
#define NCKEY_F31 suppuabize(51)
#define NCKEY_F32 suppuabize(52)
#define NCKEY_F33 suppuabize(53)
#define NCKEY_F34 suppuabize(54)
#define NCKEY_F35 suppuabize(55)
#define NCKEY_F36 suppuabize(56)
#define NCKEY_F37 suppuabize(57)
#define NCKEY_F38 suppuabize(58)
#define NCKEY_F39 suppuabize(59)
#define NCKEY_F40 suppuabize(60)
#define NCKEY_F41 suppuabize(61)
#define NCKEY_F42 suppuabize(62)
#define NCKEY_F43 suppuabize(63)
#define NCKEY_F44 suppuabize(64)
#define NCKEY_F45 suppuabize(65)
#define NCKEY_F46 suppuabize(66)
#define NCKEY_F47 suppuabize(67)
#define NCKEY_F48 suppuabize(68)
#define NCKEY_F49 suppuabize(69)
#define NCKEY_F50 suppuabize(70)
#define NCKEY_F51 suppuabize(71)
#define NCKEY_F52 suppuabize(72)
#define NCKEY_F53 suppuabize(73)
#define NCKEY_F54 suppuabize(74)
#define NCKEY_F55 suppuabize(75)
#define NCKEY_F56 suppuabize(76)
#define NCKEY_F57 suppuabize(77)
#define NCKEY_F58 suppuabize(78)
#define NCKEY_F59 suppuabize(79)
#define NCKEY_F60 suppuabize(80)
// ... leave room for up to 100 function keys, egads
#define NCKEY_ENTER suppuabize(121)
#define NCKEY_CLS suppuabize(122) // "clear-screen or erase"
#define NCKEY_DLEFT suppuabize(123) // down + left on keypad
#define NCKEY_DRIGHT suppuabize(124)
#define NCKEY_ULEFT suppuabize(125) // up + left on keypad
#define NCKEY_URIGHT suppuabize(126)
#define NCKEY_CENTER suppuabize(127) // the most truly neutral of keypresses
#define NCKEY_BEGIN suppuabize(128)
#define NCKEY_CANCEL suppuabize(129)
#define NCKEY_CLOSE suppuabize(130)
#define NCKEY_COMMAND suppuabize(131)
#define NCKEY_COPY suppuabize(132)
#define NCKEY_EXIT suppuabize(133)
#define NCKEY_PRINT suppuabize(134)
#define NCKEY_REFRESH suppuabize(135)
// Mouse events. We try to encode some details into the char32_t (i.e. which
// button was pressed), but some is embedded in the ncinput event. The release
// event is generic across buttons; callers must maintain state, if they care.
#define NCKEY_BUTTON1 suppuabize(201)
#define NCKEY_BUTTON2 suppuabize(202)
#define NCKEY_BUTTON3 suppuabize(203)
#define NCKEY_BUTTON4 suppuabize(204)
#define NCKEY_BUTTON5 suppuabize(205)
#define NCKEY_BUTTON6 suppuabize(206)
#define NCKEY_BUTTON7 suppuabize(207)
#define NCKEY_BUTTON8 suppuabize(208)
#define NCKEY_BUTTON9 suppuabize(209)
#define NCKEY_BUTTON10 suppuabize(210)
#define NCKEY_BUTTON11 suppuabize(211)
#define NCKEY_RELEASE suppuabize(212)
// Is this char32_t a Supplementary Private Use Area-B codepoint?
static inline bool
nckey_supppuab_p(char32_t w){
return w >= 0x100000 && w <= 0x10fffd;
}
// Is the event a synthesized mouse event?
static inline bool
nckey_mouse_p(char32_t r){
return r >= NCKEY_BUTTON1 && r <= NCKEY_RELEASE;
}
// An input event. Cell coordinates are currently defined only for mouse events.
typedef struct ncinput {
char32_t id; // identifier. Unicode codepoint or synthesized NCKEY event
int y; // y cell coordinate of event, -1 for undefined
int x; // x cell coordinate of event, -1 for undefined
bool alt; // was alt held?
bool shift; // was shift held?
bool ctrl; // was ctrl held?
} ncinput;
// See ppoll(2) for more detail. Provide a NULL 'ts' to block at length, a 'ts'
// of 0 for non-blocking operation, and otherwise a timespec to bound blocking.
// Signals in sigmask (less several we handle internally) will be atomically
// masked and unmasked per ppoll(2). It should generally contain all signals.
// Returns a single Unicode code point, or (char32_t)-1 on error. 'sigmask' may
// be NULL. Returns 0 on a timeout. If an event is processed, the return value
// is the 'id' field from that event. 'ni' may be NULL.
API char32_t notcurses_getc(struct notcurses* n, const struct timespec* ts,
sigset_t* sigmask, ncinput* ni);
// 'ni' may be NULL if the caller is uninterested in event details. If no event
// is ready, returns 0.
static inline char32_t
notcurses_getc_nblock(struct notcurses* n, ncinput* ni){
sigset_t sigmask;
sigfillset(&sigmask);
struct timespec ts = { .tv_sec = 0, .tv_nsec = 0 };
return notcurses_getc(n, &ts, &sigmask, ni);
}
// 'ni' may be NULL if the caller is uninterested in event details. Blocks
// until an event is processed or a signal is received.
static inline char32_t
notcurses_getc_blocking(struct notcurses* n, ncinput* ni){
sigset_t sigmask;
sigemptyset(&sigmask);
return notcurses_getc(n, NULL, &sigmask, ni);
}
// Enable the mouse in "button-event tracking" mode with focus detection and
// UTF8-style extended coordinates. On failure, -1 is returned. On success, 0
// is returned, and mouse events will be published to notcurses_getc().
API int notcurses_mouse_enable(struct notcurses* n);
// Disable mouse events. Any events in the input queue can still be delivered.
API int notcurses_mouse_disable(struct notcurses* n);
// Refresh our idea of the terminal's dimensions, reshaping the standard plane
// if necessary. Without a call to this function following a terminal resize
// (as signaled via SIGWINCH), notcurses_render() might not function properly.
// References to ncplanes (and the egcpools underlying cells) remain valid
// following a resize operation, but the cursor might have changed position.
API int notcurses_resize(struct notcurses* n, int* RESTRICT y, int* RESTRICT x);
// Refresh the physical screen to match what was last rendered (i.e., without
// reflecting any changes since the last call to notcurses_render()). This is
// primarily useful if the screen is externally corrupted.
API int notcurses_refresh(struct notcurses* n);
// Get a reference to the standard plane (one matching our current idea of the
// terminal size) for this terminal. The standard plane always exists, and its
// origin is always at the uppermost, leftmost cell of the screen.
API struct ncplane* notcurses_stdplane(struct notcurses* nc);
API const struct ncplane* notcurses_stdplane_const(const struct notcurses* nc);
// Retrieve the contents of the specified cell as last rendered. The EGC is
// returned, or NULL on error. This EGC must be free()d by the caller. The cell
// 'c' is not bound to a plane, and thus its gcluster value must not be used--
// use the return value only.
API char* notcurses_at_yx(struct notcurses* nc, int yoff, int xoff, cell* c);
// Alignment within the ncplane. Left/right-justified, or centered.
typedef enum {
NCALIGN_LEFT,
NCALIGN_CENTER,
NCALIGN_RIGHT,
} ncalign_e;
// Create a new ncplane at the specified offset (relative to the standard plane)
// and the specified size. The number of rows and columns must both be positive.
// This plane is initially at the top of the z-buffer, as if ncplane_move_top()
// had been called on it. The void* 'opaque' can be retrieved (and reset) later.
API struct ncplane* ncplane_new(struct notcurses* nc, int rows, int cols,
int yoff, int xoff, void* opaque);
API struct ncplane* ncplane_aligned(struct ncplane* n, int rows, int cols,
int yoff, ncalign_e align, void* opaque);
// Duplicate an existing ncplane. The new plane will have the same geometry,
// will duplicate all content, and will start with the same rendering state.
// The new plane will be immediately above the old one on the z axis.
API struct ncplane* ncplane_dup(struct ncplane* n, void* opaque);
// Returns a 16-bit bitmask of supported curses-style attributes
// (CELL_STYLE_UNDERLINE, CELL_STYLE_BOLD, etc.) The attribute is only
// indicated as supported if the terminal can support it together with color.
// For more information, see the "ncv" capability in terminfo(5).
API unsigned notcurses_supported_styles(const struct notcurses* nc);
// Returns the number of simultaneous colors claimed to be supported, or 1 if
// there is no color support. Note that several terminal emulators advertise
// more colors than they actually support, downsampling internally.
API int notcurses_palette_size(const struct notcurses* nc);
// Capabilities
// Can we fade? Fading requires either the "rgb" or "ccc" terminfo capability.
API bool notcurses_canfade(const struct notcurses* nc);
// Can we set the "hardware" palette? Requires the "ccc" terminfo capability.
API bool notcurses_canchangecolor(const struct notcurses* nc);
// Can we load images/videos? This requires being built against FFmpeg.
API bool notcurses_canopen(const struct notcurses* nc);
typedef struct ncstats {
uint64_t renders; // number of successful notcurses_render() runs
uint64_t failed_renders; // number of aborted renders, should be 0
uint64_t render_bytes; // bytes emitted to ttyfp
int64_t render_max_bytes; // max bytes emitted for a frame
int64_t render_min_bytes; // min bytes emitted for a frame
uint64_t render_ns; // nanoseconds spent in notcurses_render()
int64_t render_max_ns; // max ns spent in notcurses_render()
int64_t render_min_ns; // min ns spent in successful notcurses_render()
uint64_t cellelisions; // cells we elided entirely thanks to damage maps
uint64_t cellemissions; // cells we emitted due to inferred damage
uint64_t fbbytes; // total bytes devoted to all active framebuffers
uint64_t fgelisions; // RGB fg elision count
uint64_t fgemissions; // RGB fg emissions
uint64_t bgelisions; // RGB bg elision count
uint64_t bgemissions; // RGB bg emissions
uint64_t defaultelisions; // default color was emitted
uint64_t defaultemissions; // default color was elided
} ncstats;
// Acquire an atomic snapshot of the notcurses object's stats.
API void notcurses_stats(struct notcurses* nc, ncstats* stats);
// Reset all cumulative stats (immediate ones, such as fbbytes, are not reset).
API void notcurses_reset_stats(struct notcurses* nc, ncstats* stats);
// Return the dimensions of this ncplane.
API void ncplane_dim_yx(struct ncplane* n, int* RESTRICT rows, int* RESTRICT cols);
static inline int
ncplane_dim_y(struct ncplane* n){
int dimy;
ncplane_dim_yx(n, &dimy, NULL);
return dimy;
}
static inline int
ncplane_dim_x(struct ncplane* n){
int dimx;
ncplane_dim_yx(n, NULL, &dimx);
return dimx;
}
// Return our current idea of the terminal dimensions in rows and cols.
static inline void
notcurses_term_dim_yx(struct notcurses* n, int* RESTRICT rows, int* RESTRICT cols){
ncplane_dim_yx(notcurses_stdplane(n), rows, cols);
}
// Resize the specified ncplane. The four parameters 'keepy', 'keepx',
// 'keepleny', and 'keeplenx' define a subset of the ncplane to keep,
// unchanged. This may be a section of size 0, though none of these four
// parameters may be negative. 'keepx' and 'keepy' are relative to the ncplane.
// They must specify a coordinate within the ncplane's totality. 'yoff' and
// 'xoff' are relative to 'keepy' and 'keepx', and place the upper-left corner
// of the resized ncplane. Finally, 'ylen' and 'xlen' are the dimensions of the
// ncplane after resizing. 'ylen' must be greater than or equal to 'keepleny',
// and 'xlen' must be greater than or equal to 'keeplenx'. It is an error to
// attempt to resize the standard plane. If either of 'keepleny' or 'keeplenx'
// is non-zero, both must be non-zero.
//
// Essentially, the kept material does not move. It serves to anchor the
// resized plane. If there is no kept material, the plane can move freely.
API int ncplane_resize(struct ncplane* n, int keepy, int keepx, int keepleny,
int keeplenx, int yoff, int xoff, int ylen, int xlen);
// Resize the plane, retaining what data we can (everything, unless we're
// shrinking in some dimension). Keep the origin where it is.
static inline int
ncplane_resize_simple(struct ncplane* n, int ylen, int xlen){
int oldy, oldx;
ncplane_dim_yx(n, &oldy, &oldx); // current dimensions of 'n'
int keepleny = oldy > ylen ? ylen : oldy;
int keeplenx = oldx > xlen ? xlen : oldx;
return ncplane_resize(n, 0, 0, keepleny, keeplenx, 0, 0, ylen, xlen);
}
// Destroy the specified ncplane. None of its contents will be visible after
// the next call to notcurses_render(). It is an error to attempt to destroy
// the standard plane.
API int ncplane_destroy(struct ncplane* ncp);
// Set the ncplane's base cell to this cell. If defined, it will be rendered
// anywhere that the ncplane's gcluster is 0. Erasing the ncplane does not
// reset the base cell; this function must instead be called with a zero c.
API int ncplane_set_base(struct ncplane* ncp, const cell* c);
// Extract the ncplane's base cell into 'c'. The reference is invalidated if
// 'ncp' is destroyed.
API int ncplane_base(struct ncplane* ncp, cell* c);
// Move this plane relative to the standard plane. It is an error to attempt to
// move the standard plane.
API int ncplane_move_yx(struct ncplane* n, int y, int x);
// Get the origin of this plane relative to the standard plane.
API void ncplane_yx(const struct ncplane* n, int* RESTRICT y, int* RESTRICT x);
// Splice ncplane 'n' out of the z-buffer, and reinsert it at the top or bottom.
API int ncplane_move_top(struct ncplane* n);
API int ncplane_move_bottom(struct ncplane* n);
// Splice ncplane 'n' out of the z-buffer, and reinsert it above 'above'.
API int ncplane_move_above_unsafe(struct ncplane* RESTRICT n,
struct ncplane* RESTRICT above);
static inline int
ncplane_move_above(struct ncplane* n, struct ncplane* above){
if(n == above){
return -1;
}
return ncplane_move_above_unsafe(n, above);
}
// Splice ncplane 'n' out of the z-buffer, and reinsert it below 'below'.
API int ncplane_move_below_unsafe(struct ncplane* RESTRICT n,
struct ncplane* RESTRICT below);
static inline int
ncplane_move_below(struct ncplane* n, struct ncplane* below){
if(n == below){
return -1;
}
return ncplane_move_below_unsafe(n, below);
}
// Return the plane above this one, or NULL if this is at the top.
API struct ncplane* ncplane_below(struct ncplane* n);
// Retrieve the cell at the cursor location on the specified plane, returning
// it in 'c'. This copy is safe to use until the ncplane is destroyed/erased.
API int ncplane_at_cursor(struct ncplane* n, cell* c);
// Retrieve the cell at the specified location on the specified plane, returning
// it in 'c'. This copy is safe to use until the ncplane is destroyed/erased.
// Returns the length of the EGC in bytes.
API int ncplane_at_yx(struct ncplane* n, int y, int x, cell* c);
// Manipulate the opaque user pointer associated with this plane.
// ncplane_set_userptr() returns the previous userptr after replacing
// it with 'opaque'. the others simply return the userptr.
API void* ncplane_set_userptr(struct ncplane* n, void* opaque);
API void* ncplane_userptr(struct ncplane* n);
API const void* ncplane_userptr_const(const struct ncplane* n);
// Return the column at which 'c' cols ought start in order to be aligned
// according to 'align' within ncplane 'n'. Returns INT_MAX on invalid 'align'.
// Undefined behavior on negative 'c'.
static inline int
ncplane_align(struct ncplane* n, ncalign_e align, int c){
if(align == NCALIGN_LEFT){
return 0;
}
int cols = ncplane_dim_x(n);
if(align == NCALIGN_CENTER){
return (cols - c) / 2;
}else if(align == NCALIGN_RIGHT){
return cols - c;
}
return INT_MAX;
}
// Move the cursor to the specified position (the cursor needn't be visible).
// Returns -1 on error, including negative parameters, or ones exceeding the
// plane's dimensions.
API int ncplane_cursor_move_yx(struct ncplane* n, int y, int x);
// Get the current position of the cursor within n. y and/or x may be NULL.
API void ncplane_cursor_yx(struct ncplane* n, int* RESTRICT y, int* RESTRICT x);
// Replace the cell at the specified coordinates with the provided cell 'c',
// and advance the cursor by the width of the cell (but not past the end of the
// plane). On success, returns the number of columns the cursor was advanced.
// On failure, -1 is returned.
API int ncplane_putc_yx(struct ncplane* n, int y, int x, const cell* c);
// Call ncplane_putc_yx() for the current cursor location.
static inline int
ncplane_putc(struct ncplane* n, const cell* c){
return ncplane_putc_yx(n, -1, -1, c);
}
// Replace the cell at the specified coordinates with the provided 7-bit char
// 'c'. Advance the cursor by 1. On success, returns 1. On failure, returns -1.
// This works whether the underlying char is signed or unsigned.
API int ncplane_putsimple_yx(struct ncplane* n, int y, int x, char c);
// Call ncplane_putsimple_yx() at the current cursor location.
static inline int
ncplane_putsimple(struct ncplane* n, char c){
return ncplane_putsimple_yx(n, -1, -1, c);
}
// Replace the cell at the specified coordinates with the provided EGC, and
// advance the cursor by the width of the cluster (but not past the end of the
// plane). On success, returns the number of columns the cursor was advanced.
// On failure, -1 is returned. The number of bytes converted from gclust is
// written to 'sbytes' if non-NULL.
API int ncplane_putegc_yx(struct ncplane* n, int y, int x, const char* gclust, int* sbytes);
// Call ncplane_putegc() at the current cursor location.
static inline int
ncplane_putegc(struct ncplane* n, const char* gclust, int* sbytes){
return ncplane_putegc_yx(n, -1, -1, gclust, sbytes);
}
#define WCHAR_MAX_UTF8BYTES 6
// ncplane_putegc(), but following a conversion from wchar_t to UTF-8 multibyte.
static inline int
ncplane_putwegc(struct ncplane* n, const wchar_t* gclust, int* sbytes){
// maximum of six UTF8-encoded bytes per wchar_t
const size_t mbytes = (wcslen(gclust) * WCHAR_MAX_UTF8BYTES) + 1;
char* mbstr = (char*)malloc(mbytes); // need cast for c++ callers
if(mbstr == NULL){
return -1;
}
size_t s = wcstombs(mbstr, gclust, mbytes);
if(s == (size_t)-1){
free(mbstr);
return -1;
}
int ret = ncplane_putegc(n, mbstr, sbytes);
free(mbstr);
return ret;
}
// Call ncplane_putwegc() after successfully moving to y, x.
static inline int
ncplane_putwegc_yx(struct ncplane* n, int y, int x, const wchar_t* gclust,
int* sbytes){
if(ncplane_cursor_move_yx(n, y, x)){
return -1;
}
return ncplane_putwegc(n, gclust, sbytes);
}
// Write a series of EGCs to the current location, using the current style.
// They will be interpreted as a series of columns (according to the definition
// of ncplane_putc()). Advances the cursor by some positive number of cells
// (though not beyond the end of the plane); this number is returned on success.
// On error, a non-positive number is returned, indicating the number of cells
// which were written before the error.
API int ncplane_putstr_yx(struct ncplane* n, int y, int x, const char* gclustarr);
static inline int
ncplane_putstr(struct ncplane* n, const char* gclustarr){
return ncplane_putstr_yx(n, -1, -1, gclustarr);
}
API int ncplane_putstr_aligned(struct ncplane* n, int y, ncalign_e align,
const char* s);
// ncplane_putstr(), but following a conversion from wchar_t to UTF-8 multibyte.
static inline int
ncplane_putwstr_yx(struct ncplane* n, int y, int x, const wchar_t* gclustarr){
// maximum of six UTF8-encoded bytes per wchar_t
const size_t mbytes = (wcslen(gclustarr) * WCHAR_MAX_UTF8BYTES) + 1;
char* mbstr = (char*)malloc(mbytes); // need cast for c++ callers
if(mbstr == NULL){
return -1;
}
size_t s = wcstombs(mbstr, gclustarr, mbytes);
if(s == (size_t)-1){
free(mbstr);
return -1;
}
int ret = ncplane_putstr_yx(n, y, x, mbstr);
free(mbstr);
return ret;
}
static inline int
ncplane_putwstr_aligned(struct ncplane* n, int y, ncalign_e align,
const wchar_t* gclustarr){
int width = wcswidth(gclustarr, INT_MAX);
int xpos = ncplane_align(n, align, width);
return ncplane_putwstr_yx(n, y, xpos, gclustarr);
}
static inline int
ncplane_putwstr(struct ncplane* n, const wchar_t* gclustarr){
return ncplane_putwstr_yx(n, -1, -1, gclustarr);
}
// Replace the cell at the specified coordinates with the provided wide char
// 'w'. Advance the cursor by the character's width as reported by wcwidth().
// On success, returns 1. On failure, returns -1.
static inline int
ncplane_putwc_yx(struct ncplane* n, int y, int x, wchar_t w){
wchar_t warr[2] = { w, L'\0' };
return ncplane_putwstr_yx(n, y, x, warr);
}
// Call ncplane_putwc() at the current cursor position.
static inline int
ncplane_putwc(struct ncplane* n, wchar_t w){
return ncplane_putwc_yx(n, -1, -1, w);
}
// The ncplane equivalents of printf(3) and vprintf(3).
API int ncplane_vprintf_aligned(struct ncplane* n, int y, ncalign_e align,
const char* format, va_list ap);
API int ncplane_vprintf_yx(struct ncplane* n, int y, int x,
const char* format, va_list ap);
static inline int
ncplane_vprintf(struct ncplane* n, const char* format, va_list ap){
return ncplane_vprintf_yx(n, -1, -1, format, ap);
}
static inline int
ncplane_printf(struct ncplane* n, const char* format, ...)
__attribute__ ((format (printf, 2, 3)));
static inline int
ncplane_printf(struct ncplane* n, const char* format, ...){
va_list va;
va_start(va, format);
int ret = ncplane_vprintf(n, format, va);
va_end(va);
return ret;
}
static inline int
ncplane_printf_yx(struct ncplane* n, int y, int x, const char* format, ...)
__attribute__ ((format (printf, 4, 5)));
static inline int
ncplane_printf_yx(struct ncplane* n, int y, int x, const char* format, ...){
va_list va;
va_start(va, format);
int ret = ncplane_vprintf_yx(n, y, x, format, va);
va_end(va);
return ret;
}
static inline int
ncplane_printf_aligned(struct ncplane* n, int y, ncalign_e align,
const char* format, ...)
__attribute__ ((format (printf, 4, 5)));
static inline int
ncplane_printf_aligned(struct ncplane* n, int y, ncalign_e align, const char* format, ...){
va_list va;
va_start(va, format);
int ret = ncplane_vprintf_aligned(n, y, align, format, va);
va_end(va);
return ret;
}
// Draw horizontal or vertical lines using the specified cell, starting at the
// current cursor position. The cursor will end at the cell following the last
// cell output (even, perhaps counter-intuitively, when drawing vertical
// lines), just as if ncplane_putc() was called at that spot. Return the
// number of cells drawn on success. On error, return the negative number of
// cells drawn.
API int ncplane_hline_interp(struct ncplane* n, const cell* c, int len,
uint64_t c1, uint64_t c2);
static inline int
ncplane_hline(struct ncplane* n, const cell* c, int len){
return ncplane_hline_interp(n, c, len, c->channels, c->channels);
}
API int ncplane_vline_interp(struct ncplane* n, const cell* c, int len,
uint64_t c1, uint64_t c2);
static inline int
ncplane_vline(struct ncplane* n, const cell* c, int len){
return ncplane_vline_interp(n, c, len, c->channels, c->channels);
}
// Draw a box with its upper-left corner at the current cursor position, and its
// lower-right corner at 'ystop'x'xstop'. The 6 cells provided are used to draw the
// upper-left, ur, ll, and lr corners, then the horizontal and vertical lines.
// 'ctlword' is defined in the least significant byte, where bits [7, 4] are a
// gradient mask, and [3, 0] are a border mask:
// * 7, 3: top
// * 6, 2: right
// * 5, 1: bottom
// * 4, 0: left
// If the gradient bit is not set, the styling from the hl/vl cells is used for
// the horizontal and vertical lines, respectively. If the gradient bit is set,
// the color is linearly interpolated between the two relevant corner cells.
//
// By default, vertexes are drawn whether their connecting edges are drawn or
// not. The value of the bits corresponding to NCBOXCORNER_MASK control this,
// and are interpreted as the number of connecting edges necessary to draw a
// given corner. At 0 (the default), corners are always drawn. At 3, corners
// are never drawn (as at most 2 edges can touch a box's corner).
#define NCBOXMASK_TOP 0x0001
#define NCBOXMASK_RIGHT 0x0002
#define NCBOXMASK_BOTTOM 0x0004
#define NCBOXMASK_LEFT 0x0008
#define NCBOXGRAD_TOP 0x0010
#define NCBOXGRAD_RIGHT 0x0020
#define NCBOXGRAD_BOTTOM 0x0040
#define NCBOXGRAD_LEFT 0x0080
#define NCBOXCORNER_MASK 0x0300
#define NCBOXCORNER_SHIFT 8u
API int ncplane_box(struct ncplane* n, const cell* ul, const cell* ur,
const cell* ll, const cell* lr, const cell* hline,
const cell* vline, int ystop, int xstop,
unsigned ctlword);
// Draw a box with its upper-left corner at the current cursor position, having
// dimensions 'ylen'x'xlen'. See ncplane_box() for more information. The
// minimum box size is 2x2, and it cannot be drawn off-screen.
static inline int
ncplane_box_sized(struct ncplane* n, const cell* ul, const cell* ur,
const cell* ll, const cell* lr, const cell* hline,
const cell* vline, int ylen, int xlen, unsigned ctlword){
int y, x;
ncplane_cursor_yx(n, &y, &x);
return ncplane_box(n, ul, ur, ll, lr, hline, vline, y + ylen - 1,
x + xlen - 1, ctlword);
}
// Erase every cell in the ncplane, resetting all attributes to normal, all
// colors to the default color, and all cells to undrawn. All cells associated
// with this ncplane is invalidated, and must not be used after the call,
// excluding the base cell.
API void ncplane_erase(struct ncplane* n);
#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
// These lowest-level functions manipulate a 64-bit channel encoding directly.
// Users will typically manipulate ncplane and cell channels through those APIs,
// rather than calling these directly.
// Extract the 8-bit red component from a 32-bit channel.
static inline unsigned
channel_r(unsigned channel){
return (channel & 0xff0000u) >> 16u;
}
// Extract the 8-bit green component from a 32-bit channel.
static inline unsigned
channel_g(unsigned channel){
return (channel & 0x00ff00u) >> 8u;
}
// Extract the 8-bit blue component from a 32-bit channel.
static inline unsigned
channel_b(unsigned channel){
return (channel & 0x0000ffu);
}
// Extract the three 8-bit R/G/B components from a 32-bit channel.
static inline unsigned
channel_rgb(unsigned channel, unsigned* RESTRICT r, unsigned* RESTRICT g,
unsigned* RESTRICT b){
*r = channel_r(channel);
*g = channel_g(channel);
*b = channel_b(channel);
return channel;
}
// Set the three 8-bit components of a 32-bit channel, and mark it as not using
// the default color. Retain the other bits unchanged.
static inline int
channel_set_rgb(unsigned* channel, int r, int g, int b){
if(r >= 256 || g >= 256 || b >= 256){
return -1;
}
if(r < 0 || g < 0 || b < 0){
return -1;
}
unsigned c = (r << 16u) | (g << 8u) | b;
*channel = (*channel & ~CELL_BG_MASK) | CELL_BGDEFAULT_MASK | c;
return 0;
}
// Set the three 8-bit components of a 32-bit channel, and mark it as not using
// the default color. Retain the other bits unchanged. r, g, and b will be
// clipped to the range [0..255].
static inline void
channel_set_rgb_clipped(unsigned* channel, int r, int g, int b){
if(r >= 256){
r = 255;
}
if(g >= 256){
g = 255;
}
if(b >= 256){
b = 255;
}
if(r <= -1){
r = 0;
}
if(g <= -1){
g = 0;
}
if(b <= -1){
b = 0;
}
unsigned c = (r << 16u) | (g << 8u) | b;
*channel = (*channel & ~CELL_BG_MASK) | CELL_BGDEFAULT_MASK | c;
}
// Same, but provide an assembled, packed 24 bits of rgb.
static inline int
channel_set(unsigned* channel, unsigned rgb){
if(rgb > 0xffffffu){
return -1;
}
*channel = (*channel & ~CELL_BG_MASK) | CELL_BGDEFAULT_MASK | rgb;
return 0;
}
// Extract the 2-bit alpha component from a 32-bit channel.
static inline unsigned
channel_alpha(unsigned channel){
return (channel & CELL_ALPHA_MASK) >> CELL_ALPHA_SHIFT;
}
// Set the 2-bit alpha component of the 32-bit channel.
static inline int
channel_set_alpha(unsigned* channel, int alpha){
if(alpha < CELL_ALPHA_OPAQUE || alpha > CELL_ALPHA_HIGHCONTRAST){
return -1;
}
*channel = (alpha << CELL_ALPHA_SHIFT) | (*channel & ~CELL_ALPHA_MASK);
return 0;
}
// Is this channel using the "default color" rather than RGB/palette-indexed?
static inline bool
channel_default_p(unsigned channel){
return !(channel & CELL_BGDEFAULT_MASK);
}
// Is this channel using palette-indexed color rather than RGB?
static inline bool
channel_palindex_p(unsigned channel){
return !channel_default_p(channel) && (channel & CELL_BG_PALETTE);
}
// Mark the channel as using its default color, which also marks it opaque.
static inline unsigned
channel_set_default(unsigned* channel){
return *channel &= ~(CELL_BGDEFAULT_MASK | CELL_ALPHA_HIGHCONTRAST);
}
// Extract the 32-bit background channel from a channel pair.
static inline unsigned
channels_bchannel(uint64_t channels){
return channels & 0xfffffffflu;
}
// Extract the 32-bit foreground channel from a channel pair.
static inline unsigned
channels_fchannel(uint64_t channels){
return channels_bchannel(channels >> 32u);
}
// Set the 32-bit background channel of a channel pair.
static inline uint64_t
channels_set_bchannel(uint64_t* channels, uint32_t channel){
return *channels = (*channels & 0xffffffff00000000llu) | channel;
}
// Set the 32-bit foreground channel of a channel pair.
static inline uint64_t
channels_set_fchannel(uint64_t* channels, uint32_t channel){
return *channels = (*channels & 0xfffffffflu) | ((uint64_t)channel << 32u);
}
// Extract 24 bits of foreground RGB from 'channels', shifted to LSBs.
static inline unsigned
channels_fg(uint64_t channels){
return channels_fchannel(channels) & CELL_BG_MASK;
}
// Extract 24 bits of background RGB from 'channels', shifted to LSBs.
static inline unsigned
channels_bg(uint64_t channels){
return channels_bchannel(channels) & CELL_BG_MASK;
}
// Extract 2 bits of foreground alpha from 'channels', shifted to LSBs.
static inline unsigned
channels_fg_alpha(uint64_t channels){
return channel_alpha(channels_fchannel(channels));
}
// Extract 2 bits of background alpha from 'channels', shifted to LSBs.
static inline unsigned
channels_bg_alpha(uint64_t channels){
return channel_alpha(channels_bchannel(channels));
}
// Extract 24 bits of foreground RGB from 'channels', split into subchannels.
static inline unsigned
channels_fg_rgb(uint64_t channels, unsigned* r, unsigned* g, unsigned* b){
return channel_rgb(channels_fchannel(channels), r, g, b);
}
// Extract 24 bits of background RGB from 'channels', split into subchannels.
static inline unsigned
channels_bg_rgb(uint64_t channels, unsigned* r, unsigned* g, unsigned* b){
return channel_rgb(channels_bchannel(channels), r, g, b);
}
// Set the r, g, and b channels for the foreground component of this 64-bit
// 'channels' variable, and mark it as not using the default color.
static inline int
channels_set_fg_rgb(uint64_t* channels, int r, int g, int b){
unsigned channel = channels_fchannel(*channels);
if(channel_set_rgb(&channel, r, g, b) < 0){
return -1;
}
*channels = ((uint64_t)channel << 32llu) | (*channels & 0xffffffffllu);
return 0;
}
// Same, but clips to [0..255].
static inline void
channels_set_fg_rgb_clipped(uint64_t* channels, int r, int g, int b){
unsigned channel = channels_fchannel(*channels);
channel_set_rgb_clipped(&channel, r, g, b);
*channels = ((uint64_t)channel << 32llu) | (*channels & 0xffffffffllu);
}
// Set the r, g, and b channels for the background component of this 64-bit
// 'channels' variable, and mark it as not using the default color.
static inline int
channels_set_bg_rgb(uint64_t* channels, int r, int g, int b){
unsigned channel = channels_bchannel(*channels);
if(channel_set_rgb(&channel, r, g, b) < 0){
return -1;
}
*channels = (*channels & 0xffffffff00000000llu) | channel;
return 0;
}
// Same, but clips to [0..255].
static inline void
channels_set_bg_rgb_clipped(uint64_t* channels, int r, int g, int b){
unsigned channel = channels_bchannel(*channels);
channel_set_rgb_clipped(&channel, r, g, b);
*channels = (*channels & 0xffffffff00000000llu) | channel;
}
// Same, but set an assembled 32 bit channel at once.
static inline int
channels_set_fg(uint64_t* channels, unsigned rgb){
unsigned channel = channels_fchannel(*channels);
if(channel_set(&channel, rgb) < 0){
return -1;
}
*channels = ((uint64_t)channel << 32llu) | (*channels & 0xffffffffllu);
return 0;
}
static inline int
channels_set_bg(uint64_t* channels, unsigned rgb){
unsigned channel = channels_bchannel(*channels);
if(channel_set(&channel, rgb) < 0){
return -1;
}
*channels = (*channels & 0xffffffff00000000llu) | channel;
return 0;
}
// Set the 2-bit alpha component of the foreground channel.
static inline int
channels_set_fg_alpha(uint64_t* channels, int alpha){
unsigned channel = channels_fchannel(*channels);
if(channel_set_alpha(&channel, alpha) < 0){
return -1;
}
*channels = ((uint64_t)channel << 32llu) | (*channels & 0xffffffffllu);
return 0;
}
// Set the 2-bit alpha component of the background channel.
static inline int
channels_set_bg_alpha(uint64_t* channels, int alpha){
if(alpha == CELL_ALPHA_HIGHCONTRAST){ // forbidden for background alpha
return -1;
}
unsigned channel = channels_bchannel(*channels);
if(channel_set_alpha(&channel, alpha) < 0){
return -1;
}
*channels = (*channels & 0xffffffff00000000llu) | channel;
return 0;
}
// Is the foreground using the "default foreground color"?
static inline bool
channels_fg_default_p(uint64_t channels){
return channel_default_p(channels_fchannel(channels));
}
// Is the foreground using indexed palette color?
static inline bool
channels_fg_palindex_p(uint64_t channels){
return channel_palindex_p(channels_fchannel(channels));
}
// Is the background using the "default background color"? The "default
// background color" must generally be used to take advantage of
// terminal-effected transparency.
static inline bool
channels_bg_default_p(uint64_t channels){
return channel_default_p(channels_bchannel(channels));
}
// Is the background using indexed palette color?
static inline bool
channels_bg_palindex_p(uint64_t channels){
return channel_palindex_p(channels_bchannel(channels));
}
// Mark the foreground channel as using its default color.
static inline uint64_t
channels_set_fg_default(uint64_t* channels){
unsigned channel = channels_fchannel(*channels);
channel_set_default(&channel);
*channels = ((uint64_t)channel << 32llu) | (*channels & 0xffffffffllu);
return *channels;
}
// Mark the foreground channel as using its default color.
static inline uint64_t
channels_set_bg_default(uint64_t* channels){
unsigned channel = channels_bchannel(*channels);
channel_set_default(&channel);
*channels = (*channels & 0xffffffff00000000llu) | channel;
return *channels;
}
// Returns the result of blending two channels. 'blends' indicates how heavily
// 'c1' ought be weighed. If 'blends' is 0, 'c1' will be entirely replaced by
// 'c2'. If 'c1' is otherwise the default color, 'c1' will not be touched,
// since we can't blend default colors. Likewise, if 'c2' is a default color,
// it will not be used (unless 'blends' is 0).
//
// Palette-indexed colors do not blend, and since we need the attrword to store
// them, we just don't fuck wit' 'em here. Do not pass me palette-indexed
// channels! I will eat them.
static inline unsigned
channels_blend(unsigned c1, unsigned c2, unsigned blends){
unsigned rsum, gsum, bsum;
if(blends == 0){
// don't just return c2, or you set wide status and all kinds of crap
if(channel_default_p(c2)){
channel_set_default(&c1);
}else{
channel_rgb(c2, &rsum, &gsum, &bsum);
channel_set_rgb(&c1, rsum, gsum, bsum);
}
channel_set_alpha(&c1, channel_alpha(c2));
}else if(!channel_default_p(c2) && !channel_default_p(c1)){
rsum = (channel_r(c1) * blends + channel_r(c2)) / (blends + 1);
gsum = (channel_g(c1) * blends + channel_g(c2)) / (blends + 1);
bsum = (channel_b(c1) * blends + channel_b(c2)) / (blends + 1);
channel_set_rgb(&c1, rsum, gsum, bsum);
channel_set_alpha(&c1, channel_alpha(c2));
}
return c1;
}
// Extract the 32-bit background channel from a cell.
static inline unsigned
cell_bchannel(const cell* cl){
return channels_bchannel(cl->channels);
}
// Extract the 32-bit foreground channel from a cell.
static inline unsigned
cell_fchannel(const cell* cl){
return channels_fchannel(cl->channels);
}
// Set the 32-bit background channel of a cell.
static inline uint64_t
cell_set_bchannel(cell* cl, uint32_t channel){
return channels_set_bchannel(&cl->channels, channel);
}
// Set the 32-bit foreground channel of a cell.
static inline uint64_t
cell_set_fchannel(cell* cl, uint32_t channel){
return channels_set_fchannel(&cl->channels, channel);
}
// do not pass palette-indexed channels!
static inline uint64_t
cell_blend_fchannel(cell* cl, unsigned channel, unsigned blends){
return cell_set_fchannel(cl, channels_blend(cell_fchannel(cl), channel, blends));
}
static inline uint64_t
cell_blend_bchannel(cell* cl, unsigned channel, unsigned blends){
return cell_set_bchannel(cl, channels_blend(cell_bchannel(cl), channel, blends));
}
// Extract 24 bits of foreground RGB from 'cell', shifted to LSBs.
static inline unsigned
cell_fg(const cell* cl){
return channels_fg(cl->channels);
}
// Extract 24 bits of background RGB from 'cell', shifted to LSBs.
static inline unsigned
cell_bg(const cell* cl){
return channels_bg(cl->channels);
}
// Extract 2 bits of foreground alpha from 'cell', shifted to LSBs.
static inline unsigned
cell_fg_alpha(const cell* cl){
return channels_fg_alpha(cl->channels);
}
// Extract 2 bits of background alpha from 'cell', shifted to LSBs.
static inline unsigned
cell_bg_alpha(const cell* cl){
return channels_bg_alpha(cl->channels);
}
// Extract 24 bits of foreground RGB from 'cell', split into subcell.
static inline unsigned
cell_fg_rgb(const cell* cl, unsigned* r, unsigned* g, unsigned* b){
return channels_fg_rgb(cl->channels, r, g, b);
}
// Extract 24 bits of background RGB from 'cell', split into subcell.
static inline unsigned
cell_bg_rgb(const cell* cl, unsigned* r, unsigned* g, unsigned* b){
return channels_bg_rgb(cl->channels, r, g, b);
}
// Set the r, g, and b cell for the foreground component of this 64-bit
// 'cell' variable, and mark it as not using the default color.
static inline int
cell_set_fg_rgb(cell* cl, int r, int g, int b){
return channels_set_fg_rgb(&cl->channels, r, g, b);
}
// Same, but clipped to [0..255].
static inline void
cell_set_fg_rgb_clipped(cell* cl, int r, int g, int b){
channels_set_fg_rgb_clipped(&cl->channels, r, g, b);
}
// Same, but with an assembled 32-bit channel.
static inline int
cell_set_fg(cell* c, uint32_t channel){
return channels_set_fg(&c->channels, channel);
}
// Set the cell's foreground palette index, set the foreground palette index
// bit, set it foreground-opaque, and clear the foreground default color bit.
static inline int
cell_set_fg_palindex(cell* cl, int idx){
if(idx < 0 || idx >= NCPALETTESIZE){
return -1;
}
cl->channels |= CELL_FGDEFAULT_MASK;
cl->channels |= CELL_FG_PALETTE;
cl->channels &= ~(CELL_ALPHA_MASK << 32u);
cl->attrword &= 0xffff00ff;
cl->attrword |= (idx << 8u);
return 0;
}
static inline unsigned
cell_fg_palindex(const cell* cl){
return (cl->attrword & 0x0000ff00) >> 8u;
}
// Set the r, g, and b cell for the background component of this 64-bit
// 'cell' variable, and mark it as not using the default color.
static inline int
cell_set_bg_rgb(cell* cl, int r, int g, int b){
return channels_set_bg_rgb(&cl->channels, r, g, b);
}
// Same, but clipped to [0..255].
static inline void
cell_set_bg_rgb_clipped(cell* cl, int r, int g, int b){
channels_set_bg_rgb_clipped(&cl->channels, r, g, b);
}
// Same, but with an assembled 32-bit channel.
static inline int
cell_set_bg(cell* c, uint32_t channel){
return channels_set_bg(&c->channels, channel);
}
// Set the cell's background palette index, set the background palette index
// bit, set it background-opaque, and clear the background default color bit.
static inline int
cell_set_bg_palindex(cell* cl, int idx){
if(idx < 0 || idx >= NCPALETTESIZE){
return -1;
}
cl->channels |= CELL_BGDEFAULT_MASK;
cl->channels |= CELL_BG_PALETTE;
cl->channels &= ~CELL_ALPHA_MASK;
cl->attrword &= 0xffffff00;
cl->attrword |= idx;
return 0;
}
static inline unsigned
cell_bg_palindex(const cell* cl){
return cl->attrword & 0x000000ff;
}
// Is the foreground using the "default foreground color"?
static inline bool
cell_fg_default_p(const cell* cl){
return channels_fg_default_p(cl->channels);
}
static inline bool
cell_fg_palindex_p(const cell* cl){
return channels_fg_palindex_p(cl->channels);
}
// Is the background using the "default background color"? The "default
// background color" must generally be used to take advantage of
// terminal-effected transparency.
static inline bool
cell_bg_default_p(const cell* cl){
return channels_bg_default_p(cl->channels);
}
static inline bool
cell_bg_palindex_p(const cell* cl){
return channels_bg_palindex_p(cl->channels);
}
// Get the current channels or attribute word for ncplane 'n'.
API uint64_t ncplane_channels(const struct ncplane* n);
API uint32_t ncplane_attr(const struct ncplane* n);
// Extract the 32-bit working background channel from an ncplane.
static inline unsigned
ncplane_bchannel(const struct ncplane* nc){
return channels_bchannel(ncplane_channels(nc));
}
// Extract the 32-bit working foreground channel from an ncplane.
static inline unsigned
ncplane_fchannel(const struct ncplane* nc){
return channels_fchannel(ncplane_channels(nc));
}
// Extract 24 bits of working foreground RGB from an ncplane, shifted to LSBs.
static inline unsigned
ncplane_fg(const struct ncplane* nc){
return channels_fg(ncplane_channels(nc));
}
// Extract 24 bits of working background RGB from an ncplane, shifted to LSBs.
static inline unsigned
ncplane_bg(const struct ncplane* nc){
return channels_bg(ncplane_channels(nc));
}
// Extract 2 bits of foreground alpha from 'struct ncplane', shifted to LSBs.
static inline unsigned
ncplane_fg_alpha(const struct ncplane* nc){
return channels_fg_alpha(ncplane_channels(nc));
}
// Extract 2 bits of background alpha from 'struct ncplane', shifted to LSBs.
static inline unsigned
ncplane_bg_alpha(const struct ncplane* nc){
return channels_bg_alpha(ncplane_channels(nc));
}
// Extract 24 bits of foreground RGB from 'n', split into subcomponents.
static inline unsigned
ncplane_fg_rgb(const struct ncplane* n, unsigned* r, unsigned* g, unsigned* b){
return channels_fg_rgb(ncplane_channels(n), r, g, b);
}
// Extract 24 bits of background RGB from 'n', split into subcomponents.
static inline unsigned
ncplane_bg_rgb(const struct ncplane* n, unsigned* r, unsigned* g, unsigned* b){
return channels_bg_rgb(ncplane_channels(n), r, g, b);
}
// Set the current fore/background color using RGB specifications. If the
// terminal does not support directly-specified 3x8b cells (24-bit "Direct
// Color", indicated by the "RGB" terminfo capability), the provided values
// will be interpreted in some lossy fashion. None of r, g, or b may exceed 255.
// "HP-like" terminals require setting foreground and background at the same
// time using "color pairs"; notcurses will manage color pairs transparently.
API int ncplane_set_fg_rgb(struct ncplane* n, int r, int g, int b);
API int ncplane_set_bg_rgb(struct ncplane* n, int r, int g, int b);
// Same, but clipped to [0..255].
API void ncplane_set_bg_rgb_clipped(struct ncplane* n, int r, int g, int b);
API void ncplane_set_fg_rgb_clipped(struct ncplane* n, int r, int g, int b);
// Same, but with rgb assembled into a channel (i.e. lower 24 bits).
API int ncplane_set_fg(struct ncplane* n, unsigned channel);
API int ncplane_set_bg(struct ncplane* n, unsigned channel);
// Use the default color for the foreground/background.
API void ncplane_set_fg_default(struct ncplane* n);
API void ncplane_set_bg_default(struct ncplane* n);
// Set the ncplane's foreground palette index, set the foreground palette index
// bit, set it foreground-opaque, and clear the foreground default color bit.
API int ncplane_set_fg_palindex(struct ncplane* n, int idx);
API int ncplane_set_bg_palindex(struct ncplane* n, int idx);
// Set the alpha parameters for ncplane 'n'.
API int ncplane_set_fg_alpha(struct ncplane* n, int alpha);
API int ncplane_set_bg_alpha(struct ncplane* n, int alpha);
// Set the specified style bits for the ncplane 'n', whether they're actively
// supported or not.
API void ncplane_styles_set(struct ncplane* n, unsigned stylebits);
// Add the specified styles to the ncplane's existing spec.
API void ncplane_styles_on(struct ncplane* n, unsigned stylebits);
// Remove the specified styles from the ncplane's existing spec.
API void ncplane_styles_off(struct ncplane* n, unsigned stylebits);
// Return the current styling for this ncplane.
API unsigned ncplane_styles(struct ncplane* n);
// Called for each delta performed in a fade on ncp. If anything but 0 is returned,
// the fading operation ceases immediately, and that value is propagated out. If provided
// and not NULL, the faders will not themselves call notcurses_render().
typedef int (*fadecb)(struct notcurses* nc, struct ncplane* ncp, void* curry);
// Fade the ncplane out over the provided time, calling the specified function
// when done. Requires a terminal which supports direct color, or at least
// palette modification (if the terminal uses a palette, our ability to fade
// planes is limited, and affected by the complexity of the rest of the screen).
// It is not safe to resize or destroy the plane during the fadeout FIXME.
API int ncplane_fadeout(struct ncplane* n, const struct timespec* ts, fadecb fader, void* curry);
// Fade the ncplane in over the specified time. Load the ncplane with the
// target cells without rendering, then call this function. When it's done, the
// ncplane will have reached the target levels, starting from zeroes.
API int ncplane_fadein(struct ncplane* n, const struct timespec* ts, fadecb fader, void* curry);
// Pulse the plane in and out until the callback returns non-zero, relying on
// the callback 'fader' to initiate rendering. 'ts' defines the half-period
// (i.e. the transition from black to full brightness, or back again). Proper
// use involves preparing (but not rendering) an ncplane, then calling
// ncplane_pulse(), which will fade in from black to the specified colors.
API int ncplane_pulse(struct ncplane* n, const struct timespec* ts, fadecb fader, void* curry);
// Working with cells
#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), }
static inline void
cell_init(cell* c){
memset(c, 0, sizeof(*c));
}
// Breaks the UTF-8 string in 'gcluster' down, setting up the cell 'c'. Returns
// the number of bytes copied out of 'gcluster', or -1 on failure. The styling
// of the cell is left untouched, but any resources are released.
API int cell_load(struct ncplane* n, cell* c, const char* gcluster);
// cell_load(), plus blast the styling with 'attr' and 'channels'.
static inline int
cell_prime(struct ncplane* n, cell* c, const char* gcluster,
uint32_t attr, uint64_t channels){
c->attrword = attr;
c->channels = channels;
int ret = cell_load(n, c, gcluster);
return ret;
}
// Duplicate 'c' into 'targ'. Not intended for external use; exposed for the
// benefit of unit tests.
API int cell_duplicate(struct ncplane* n, cell* targ, const cell* c);
// Release resources held by the cell 'c'.
API void cell_release(struct ncplane* n, cell* c);
#define CELL_STYLE_MASK 0xffff0000ul
#define CELL_STYLE_STANDOUT 0x00800000ul
#define CELL_STYLE_UNDERLINE 0x00400000ul
#define CELL_STYLE_REVERSE 0x00200000ul
#define CELL_STYLE_BLINK 0x00100000ul
#define CELL_STYLE_DIM 0x00080000ul
#define CELL_STYLE_BOLD 0x00040000ul
#define CELL_STYLE_INVIS 0x00020000ul
#define CELL_STYLE_PROTECT 0x00010000ul
#define CELL_STYLE_ITALIC 0x01000000ul
// Set the specified style bits for the cell 'c', whether they're actively
// supported or not.
static inline void
cell_styles_set(cell* c, unsigned stylebits){
c->attrword = (c->attrword & ~CELL_STYLE_MASK) | ((stylebits & CELL_STYLE_MASK));
}
// Extract the style bits from the cell's attrword.
static inline unsigned
cell_styles(const cell* c){
return c->attrword & CELL_STYLE_MASK;
}
// Add the specified styles (in the LSBs) to the cell's existing spec, whether
// they're actively supported or not.
static inline void
cell_styles_on(cell* c, unsigned stylebits){
c->attrword |= (stylebits & CELL_STYLE_MASK);
}
// Remove the specified styles (in the LSBs) from the cell's existing spec.
static inline void
cell_styles_off(cell* c, unsigned stylebits){
c->attrword &= ~(stylebits & CELL_STYLE_MASK);
}
// Use the default color for the foreground.
static inline void
cell_set_fg_default(cell* c){
channels_set_fg_default(&c->channels);
}
// Use the default color for the background.
static inline void
cell_set_bg_default(cell* c){
channels_set_bg_default(&c->channels);
}
static inline int
cell_set_fg_alpha(cell* c, int alpha){
return channels_set_fg_alpha(&c->channels, alpha);
}
static inline int
cell_set_bg_alpha(cell* c, int alpha){
return channels_set_bg_alpha(&c->channels, alpha);
}
// Does the cell contain an East Asian Wide codepoint?
static inline bool
cell_double_wide_p(const cell* c){
return (c->channels & CELL_WIDEASIAN_MASK);
}
// Is this the right half of a wide character?
static inline bool
cell_wide_right_p(const cell* c){
return cell_double_wide_p(c) && c->gcluster == 0;
}
// Is this the left half of a wide character?
static inline bool
cell_wide_left_p(const cell* c){
return cell_double_wide_p(c) && c->gcluster;
}
// Is the cell simple (a lone ASCII character, encoded as such)?
static inline bool
cell_simple_p(const cell* c){
return c->gcluster < 0x80;
}
// return a pointer to the NUL-terminated EGC referenced by 'c'. this pointer
// is invalidated by any further operation on the plane 'n', so...watch out!
API const char* cell_extended_gcluster(const struct ncplane* n, const cell* c);
// True if the cell does not generate foreground pixels (i.e., the cell is
// entirely whitespace or special characters).
// FIXME do this at cell prep time and set a bit in the channels
static inline bool
cell_noforeground_p(const cell* c){
return cell_simple_p(c) && isspace(c->gcluster);
}
static inline int
cell_load_simple(struct ncplane* n, cell* c, char ch){
cell_release(n, c);
c->channels &= ~CELL_WIDEASIAN_MASK;
c->gcluster = ch;
if(cell_simple_p(c)){
return 1;
}
return -1;
}
// get the offset into the egcpool for this cell's EGC. returns meaningless and
// unsafe results if called on a simple cell.
static inline uint32_t
cell_egc_idx(const cell* c){
return c->gcluster - 0x80;
}
// load up six cells with the EGCs necessary to draw a box. returns 0 on
// success, -1 on error. on error, any cells this function might
// have loaded before the error are cell_release()d. There must be at least
// six EGCs in gcluster.
static inline int
cells_load_box(struct ncplane* n, uint32_t attrs, uint64_t channels,
cell* ul, cell* ur, cell* ll, cell* lr,
cell* hl, cell* vl, const char* gclusters){
int ulen;
if((ulen = cell_prime(n, ul, gclusters, attrs, channels)) > 0){
if((ulen = cell_prime(n, ur, gclusters += ulen, attrs, channels)) > 0){
if((ulen = cell_prime(n, ll, gclusters += ulen, attrs, channels)) > 0){
if((ulen = cell_prime(n, lr, gclusters += ulen, attrs, channels)) > 0){
if((ulen = cell_prime(n, hl, gclusters += ulen, attrs, channels)) > 0){
if((ulen = cell_prime(n, vl, gclusters += ulen, attrs, channels)) > 0){
return 0;
}
cell_release(n, hl);
}
cell_release(n, lr);
}
cell_release(n, ll);
}
cell_release(n, ur);
}
cell_release(n, ul);
}
return -1;
}
static inline int
cells_rounded_box(struct ncplane* n, uint32_t attr, uint64_t channels,
cell* ul, cell* ur, cell* ll, cell* lr, cell* hl, cell* vl){
return cells_load_box(n, attr, channels, ul, ur, ll, lr, hl, vl, "╭╮╰╯─│");
}
static inline int
ncplane_rounded_box(struct ncplane* n, uint32_t attr, uint64_t channels,
int ystop, int xstop, unsigned ctlword){
int ret = 0;
cell ul = CELL_TRIVIAL_INITIALIZER, ur = CELL_TRIVIAL_INITIALIZER;
cell ll = CELL_TRIVIAL_INITIALIZER, lr = CELL_TRIVIAL_INITIALIZER;
cell hl = CELL_TRIVIAL_INITIALIZER, vl = CELL_TRIVIAL_INITIALIZER;
if((ret = cells_rounded_box(n, attr, channels, &ul, &ur, &ll, &lr, &hl, &vl)) == 0){
ret = ncplane_box(n, &ul, &ur, &ll, &lr, &hl, &vl, ystop, xstop, ctlword);
}
cell_release(n, &ul); cell_release(n, &ur);
cell_release(n, &ll); cell_release(n, &lr);
cell_release(n, &hl); cell_release(n, &vl);
return ret;
}
static inline int
ncplane_rounded_box_sized(struct ncplane* n, uint32_t attr, uint64_t channels,
int ylen, int xlen, unsigned ctlword){
int y, x;
ncplane_cursor_yx(n, &y, &x);
return ncplane_rounded_box(n, attr, channels, y + ylen - 1,
x + xlen - 1, ctlword);
}
static inline int
cells_double_box(struct ncplane* n, uint32_t attr, uint64_t channels,
cell* ul, cell* ur, cell* ll, cell* lr, cell* hl, cell* vl){
return cells_load_box(n, attr, channels, ul, ur, ll, lr, hl, vl, "╔╗╚╝═║");
}
static inline int
ncplane_double_box(struct ncplane* n, uint32_t attr, uint64_t channels,
int ystop, int xstop, unsigned ctlword){
int ret = 0;
cell ul = CELL_TRIVIAL_INITIALIZER, ur = CELL_TRIVIAL_INITIALIZER;
cell ll = CELL_TRIVIAL_INITIALIZER, lr = CELL_TRIVIAL_INITIALIZER;
cell hl = CELL_TRIVIAL_INITIALIZER, vl = CELL_TRIVIAL_INITIALIZER;
if((ret = cells_double_box(n, attr, channels, &ul, &ur, &ll, &lr, &hl, &vl)) == 0){
ret = ncplane_box(n, &ul, &ur, &ll, &lr, &hl, &vl, ystop, xstop, ctlword);
}
cell_release(n, &ul); cell_release(n, &ur);
cell_release(n, &ll); cell_release(n, &lr);
cell_release(n, &hl); cell_release(n, &vl);
return ret;
}
static inline int
ncplane_double_box_sized(struct ncplane* n, uint32_t attr, uint64_t channels,
int ylen, int xlen, unsigned ctlword){
int y, x;
ncplane_cursor_yx(n, &y, &x);
return ncplane_double_box(n, attr, channels, y + ylen - 1,
x + xlen - 1, ctlword);
}
// multimedia functionality
struct AVFrame;
// Open a visual (image or video), associating it with the specified ncplane.
// Returns NULL on any error, writing the AVError to 'averr'.
// FIXME this ought also take an ncscale_e!
API struct ncvisual* ncplane_visual_open(struct ncplane* nc, const char* file,
int* averr);
// How to scale the visual in ncvisual_open_plane(). NCSCALE_NONE will open a
// plane tailored to the visual's exact needs, which is probably larger than the
// visible screen (but might be smaller). NCSCALE_SCALE scales a visual larger
// than the visible screen down, maintaining aspect ratio. NCSCALE_STRETCH
// stretches and scales the image in an attempt to fill the visible screen.
typedef enum {
NCSCALE_NONE,
NCSCALE_SCALE,
NCSCALE_STRETCH,
} ncscale_e;
// Open a visual, extract a codec and parameters, and create a new plane
// suitable for its display at 'y','x'. If there is sufficient room to display
// the visual in its native size, or if NCSCALE_NONE is passed for 'style', the
// new plane will be exactly that large. Otherwise, the plane will be as large
// as possble (given the visible screen), either maintaining aspect ratio
// (NCSCALE_SCALE) or abandoning it (NCSCALE_STRETCH).
API struct ncvisual* ncvisual_open_plane(struct notcurses* nc, const char* file,
int* averr, int y, int x,
ncscale_e style);
// Destroy an ncvisual. Rendered elements will not be disrupted, but the visual
// can be neither decoded nor rendered any further.
API void ncvisual_destroy(struct ncvisual* ncv);
// extract the next frame from an ncvisual. returns NULL on end of file,
// writing AVERROR_EOF to 'averr'. returns NULL on a decoding or allocation
// error, placing the AVError in 'averr'. this frame is invalidated by a
// subsequent call to ncvisual_decode(), and should not be freed by the caller.
API struct AVFrame* ncvisual_decode(struct ncvisual* nc, int* averr);
// Render the decoded frame to the associated ncplane. The frame will be scaled
// to the size of the ncplane per the ncscale_e style. A subregion of the
// frame can be specified using 'begx', 'begy', 'lenx', and 'leny'. To render
// the rectangle formed by begy x begx and the lower-right corner, zero can be
// supplied to 'leny' and 'lenx'. Zero for all four values will thus render the
// entire visual. Negative values for any of the four parameters are an error.
// It is an error to specify any region beyond the boundaries of the frame.
API int ncvisual_render(const struct ncvisual* ncv, int begy, int begx,
int leny, int lenx);
// Called for each frame rendered from 'ncv'. If anything but 0 is returned,
// the streaming operation ceases immediately, and that value is propagated out.
typedef int (*streamcb)(struct notcurses* nc, struct ncvisual* ncv, void*);
// Shut up and display my frames! Provide as an argument to ncvisual_stream().
static inline int
ncvisual_simple_streamer(struct notcurses* nc, struct ncvisual* ncv __attribute__ ((unused)),
void* curry __attribute__ ((unused))){
return notcurses_render(nc);
}
// Stream the entirety of the media, according to its own timing. Blocking,
// obviously. streamer may be NULL; it is otherwise called for each frame, and
// its return value handled as outlined for stream cb. Pretty raw; beware.
// If streamer() returns non-zero, the stream is aborted, and that value is
// returned. By convention, return a positive number to indicate intentional
// abort from within streamer(). 'timescale' allows the frame duration time to
// be scaled. For a visual naturally running at 30FPS, a 'timescale' of 0.1
// will result in 300FPS, and a 'timescale' of 10 will result in 3FPS. It is an
// error to supply 'timescale' less than or equal to 0.
API int ncvisual_stream(struct notcurses* nc, struct ncvisual* ncv,
int* averr, float timescale, streamcb streamer,
void* curry);
// Return the plane to which this ncvisual is bound.
API struct ncplane* ncvisual_plane(struct ncvisual* ncv);
// A panelreel is an notcurses region devoted to displaying zero or more
// line-oriented, contained panels between which the user may navigate. If at
// least one panel exists, there is an active panel. As much of the active
// panel as is possible is always displayed. If there is space left over, other
// panels are included in the display. Panels can come and go at any time, and
// can grow or shrink at any time.
//
// This structure is amenable to line- and page-based navigation via keystrokes,
// scrolling gestures, trackballs, scrollwheels, touchpads, and verbal commands.
typedef struct panelreel_options {
// require this many rows and columns (including borders). otherwise, a
// message will be displayed stating that a larger terminal is necessary, and
// input will be queued. if 0, no minimum will be enforced. may not be
// negative. note that panelreel_create() does not return error if given a
// WINDOW smaller than these minima; it instead patiently waits for the
// screen to get bigger.
int min_supported_cols;
int min_supported_rows;
// use no more than this many rows and columns (including borders). may not be
// less than the corresponding minimum. 0 means no maximum.
int max_supported_cols;
int max_supported_rows;
// desired offsets within the surrounding WINDOW (top right bottom left) upon
// creation / resize. a panelreel_move() operation updates these.
int toff, roff, boff, loff;
// is scrolling infinite (can one move down or up forever, or is an end
// reached?). if true, 'circular' specifies how to handle the special case of
// an incompletely-filled reel.
bool infinitescroll;
// is navigation circular (does moving down from the last panel move to the
// first, and vice versa)? only meaningful when infinitescroll is true. if
// infinitescroll is false, this must be false.
bool circular;
// notcurses can draw a border around the panelreel, and also around the
// component tablets. inhibit borders by setting all valid bits in the masks.
// partially inhibit borders by setting individual bits in the masks. the
// appropriate attr and pair values will be used to style the borders.
// focused and non-focused tablets can have different styles. you can instead
// draw your own borders, or forgo borders entirely.
unsigned bordermask; // bitfield; 1s will not be drawn (see bordermaskbits)
uint64_t borderchan; // attributes used for panelreel border
unsigned tabletmask; // bitfield; same as bordermask but for tablet borders
uint64_t tabletchan; // tablet border styling channel
uint64_t focusedchan;// focused tablet border styling channel
uint64_t bgchannel; // background colors
} panelreel_options;
struct tablet;
struct panelreel;
// Create a panelreel according to the provided specifications. Returns NULL on
// failure. w must be a valid WINDOW*, to which offsets are relative. Note that
// there might not be enough room for the specified offsets, in which case the
// panelreel will be clipped on the bottom and right. A minimum number of rows
// and columns can be enforced via popts. efd, if non-negative, is an eventfd
// that ought be written to whenever panelreel_touch() updates a tablet (this
// is useful in the case of nonblocking input).
API struct panelreel* panelreel_create(struct ncplane* nc,
const panelreel_options* popts,
int efd);
// Returns the ncplane on which this panelreel lives.
API struct ncplane* panelreel_plane(struct panelreel* pr);
// Tablet draw callback, provided a tablet (from which the ncplane and userptr
// may be extracted), the first column that may be used, the first row that may
// be used, the first column that may not be used, the first row that may not
// be used, and a bool indicating whether output ought be clipped at the top
// (true) or bottom (false). Rows and columns are zero-indexed, and both are
// relative to the tablet's plane.
//
// Regarding clipping: it is possible that the tablet is only partially
// displayed on the screen. If so, it is either partially present on the top of
// the screen, or partially present at the bottom. In the former case, the top
// is clipped (cliptop will be true), and output ought start from the end. In
// the latter case, cliptop is false, and output ought start from the beginning.
//
// Returns the number of lines of output, which ought be less than or equal to
// maxy - begy, and non-negative (negative values might be used in the future).
typedef int (*tabletcb)(struct tablet* t, int begx, int begy, int maxx,
int maxy, bool cliptop);
// Add a new tablet to the provided panelreel, having the callback object
// opaque. Neither, either, or both of after and before may be specified. If
// neither is specified, the new tablet can be added anywhere on the reel. If
// one or the other is specified, the tablet will be added before or after the
// specified tablet. If both are specifid, the tablet will be added to the
// resulting location, assuming it is valid (after->next == before->prev); if
// it is not valid, or there is any other error, NULL will be returned.
API struct tablet* panelreel_add(struct panelreel* pr, struct tablet* after,
struct tablet* before, tabletcb cb,
void* opaque);
// Return the number of tablets.
API int panelreel_tabletcount(const struct panelreel* pr);
// Indicate that the specified tablet has been updated in a way that would
// change its display. This will trigger some non-negative number of callbacks
// (though not in the caller's context).
API int panelreel_touch(struct panelreel* pr, struct tablet* t);
// Delete the tablet specified by t from the panelreel specified by pr. Returns
// -1 if the tablet cannot be found.
API int panelreel_del(struct panelreel* pr, struct tablet* t);
// Delete the active tablet. Returns -1 if there are no tablets.
API int panelreel_del_focused(struct panelreel* pr);
// Move to the specified location within the containing WINDOW.
API int panelreel_move(struct panelreel* pr, int x, int y);
// Redraw the panelreel in its entirety, for instance after
// clearing the screen due to external corruption, or a SIGWINCH.
API int panelreel_redraw(struct panelreel* pr);
// Return the focused tablet, if any tablets are present. This is not a copy;
// be careful to use it only for the duration of a critical section.
API struct tablet* panelreel_focused(struct panelreel* pr);
// Change focus to the next tablet, if one exists
API struct tablet* panelreel_next(struct panelreel* pr);
// Change focus to the previous tablet, if one exists
API struct tablet* panelreel_prev(struct panelreel* pr);
// Destroy a panelreel allocated with panelreel_create(). Does not destroy the
// underlying WINDOW. Returns non-zero on failure.
API int panelreel_destroy(struct panelreel* pr);
API void* tablet_userptr(struct tablet* t);
API const void* tablet_userptr_const(const struct tablet* t);
// Access the ncplane associated with this tablet, if one exists.
API struct ncplane* tablet_ncplane(struct tablet* t);
API const struct ncplane* tablet_ncplane_const(const struct tablet* t);
#define PREFIXSTRLEN 7 // Does not include a '\0' (xxx.xxU)
#define IPREFIXSTRLEN 8 // Does not include a '\0' (xxxx.xxU)
#define BPREFIXSTRLEN 9 // Does not include a '\0' (xxxx.xxUi), i == prefix
// A bit of the nasties here to stringize our preprocessor tokens just now
// #defined, making them usable as printf(3) specifiers.
#define STRHACK1(x) #x
#define STRHACK2(x) STRHACK1(x)
#define PREFIXFMT "%" STRHACK2(PREFIXSTRLEN) "s"
#define IPREFIXFMT "%" STRHACK2(IPREFIXSTRLEN) "s"
#define BPREFIXFMT "%" STRHACK2(BPREFIXSTRLEN) "s"
// Takes an arbitrarily large number, and prints it into a fixed-size buffer by
// adding the necessary SI suffix. Usually, pass a |[B]PREFIXSTRLEN+1|-sized
// buffer to generate up to [B]PREFIXSTRLEN characters. The characteristic can
// occupy up through |mult-1| characters (3 for 1000, 4 for 1024). The mantissa
// can occupy either zero or two characters.
//
// Floating-point is never used, because an IEEE758 double can only losslessly
// represent integers through 2^53-1.
//
// 2^64-1 is 18446744073709551615, 18.45E(xa). KMGTPEZY thus suffice to handle
// a 89-bit uintmax_t. Beyond Z(etta) and Y(otta) lie lands unspecified by SI.
//
// val: value to print
// decimal: scaling. '1' if none has taken place.
// buf: buffer in which string will be generated
// omitdec: inhibit printing of all-0 decimal portions
// mult: base of suffix system (almost always 1000 or 1024)
// uprefix: character to print following suffix ('i' for kibibytes basically).
// only printed if suffix is actually printed (input >= mult).
API const char* enmetric(uintmax_t val, unsigned decimal, char* buf,
int omitdec, unsigned mult, int uprefix);
// Mega, kilo, gigafoo. Use PREFIXSTRLEN + 1.
static inline const char*
qprefix(uintmax_t val, unsigned decimal, char* buf, int omitdec){
return enmetric(val, decimal, buf, omitdec, 1000, '\0');
}
// Mibi, kebi, gibibytes. Use BPREFIXSTRLEN + 1.
static inline const char*
bprefix(uintmax_t val, unsigned decimal, char* buf, int omitdec){
return enmetric(val, decimal, buf, omitdec, 1024, 'i');
}
API void notcurses_cursor_enable(struct notcurses* nc);
API void notcurses_cursor_disable(struct notcurses* nc);
// Palette API. Some terminals only support 256 colors, but allow the full
// palette to be specified with arbitrary RGB colors. In all cases, it's more
// performant to use indexed colors, since it's much less data to write to the
// terminal. If you can limit yourself to 256 colors, that' probably best.
typedef struct palette256 {
// We store the RGB values as a regular ol' channel
uint32_t chans[NCPALETTESIZE];
} palette256;
// Create a new palette store. It will be initialized with notcurses's best
// knowledge of the currently configured palette.
API palette256* palette256_new(struct notcurses* nc);
// Attempt to configure the terminal with the provided palette 'p'. Does not
// transfer ownership of 'p'; palette256_free() can still be called.
API int palette256_use(struct notcurses* nc, const palette256* p);
// Manipulate entries in the palette store 'p'. These are *not* locked.
static inline int
palette256_set_rgb(palette256* p, int idx, int r, int g, int b){
if(idx < 0 || (size_t)idx > sizeof(p->chans) / sizeof(*p->chans)){
return -1;
}
return channel_set_rgb(&p->chans[idx], r, g, b);
}
static inline int
palette256_set(palette256* p, int idx, unsigned rgb){
if(idx < 0 || (size_t)idx > sizeof(p->chans) / sizeof(*p->chans)){
return -1;
}
return channel_set(&p->chans[idx], rgb);
}
static inline int
palette256_get_rgb(const palette256* p, int idx, unsigned* RESTRICT r, unsigned* RESTRICT g, unsigned* RESTRICT b){
if(idx < 0 || (size_t)idx > sizeof(p->chans) / sizeof(*p->chans)){
return -1;
}
return channel_rgb(p->chans[idx], r, g, b);
}
// Free the palette store 'p'.
API void palette256_free(palette256* p);
// Convert the plane's content to greyscale.
API void ncplane_greyscale(struct ncplane* n);
// Direct mode. This API can be used to colorize and stylize output generated
// outside of notcurses, without ever calling notcurses_render(). These should
// not be intermixed with standard notcurses rendering.
API int ncdirect_bg_rgb8(struct ncdirect* nc, unsigned r, unsigned g, unsigned b);
API int ncdirect_fg_rgb8(struct ncdirect* nc, unsigned r, unsigned g, unsigned b);
API int ncdirect_stop(struct ncdirect* nc);
#undef API
#ifdef __cplusplus
} // extern "C"
#endif
#endif
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