#ifndef NOTCURSES_NOTCURSES #define NOTCURSES_NOTCURSES #include #include #include #include #include #include #include #include #include #include #include #include #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 // Returns the number of columns occupied by a multibyte (UTF-8) string, or // -1 if a non-printable/illegal character is encountered. static inline int mbswidth(const char* mbs){ int offset = 0; // offset into mbs int cols = 0; // number of columns consumed thus far mbstate_t ps; memset(&ps, 0, sizeof(ps)); do{ wchar_t wcs; size_t r = mbrtowc(&wcs, mbs + offset, SIZE_MAX, &ps); if(r == (size_t)-1 || r == (size_t)-2){ return -1; } int w = wcwidth(wcs); if(w < 0){ return -1; } cols += w; offset += r; }while(mbs[offset]); return cols; } #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. It will be used for purposes of // rendering anywhere that the ncplane's gcluster is 0. Erasing the ncplane // does not reset the base cell; this function must be called with a zero 'c'. API int ncplane_set_base_cell(struct ncplane* ncp, const cell* c); // Set the ncplane's base cell to this cell. It will be used for purposes of // rendering anywhere that the ncplane's gcluster is 0. Erasing the ncplane // does not reset the base cell; this function must be called with an empty // 'egc'. 'egc' must be a single extended grapheme cluster. API int ncplane_set_base(struct ncplane* ncp, uint64_t channels, uint32_t attrword, const char* egc); // 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); // Return the plane to which this ncvisual is bound. API struct ncplane* ncvisual_plane(struct ncvisual* ncv); // 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); // If a subtitle ought be displayed at this time, return a heap-allocated copy // of the UTF8 text. API char* ncvisual_subtitle(const struct ncvisual* ncv); // 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(). // If you'd like subtitles to be decoded, provide a ncplane as the curry. If the // curry is NULL, subtitles will not be displayed. static inline int ncvisual_simple_streamer(struct notcurses* nc, struct ncvisual* ncv, void* curry){ if(notcurses_render(nc)){ return -1; } int ret = 0; if(curry){ // need a cast for C++ callers struct ncplane* subncp = (struct ncplane*)curry; char* subtitle = ncvisual_subtitle(ncv); if(subtitle){ if(ncplane_putstr_yx(subncp, 0, 0, subtitle) < 0){ ret = -1; } free(subtitle); } } return ret; } // 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); // Blit a flat array 'data' of BGRx 32-bit values to the ncplane 'nc', offset // from the upper left by 'placey' and 'placex'. Each row ought occupy // 'linesize' bytes (this might be greater than lenx * 4 due to padding). A // subregion of the input can be specified with 'begy'x'begx' and 'leny'x'lenx'. API int bgrx_blit(struct ncplane* nc, int placey, int placex, int linesize, const unsigned char* data, int begy, int begx, int leny, int lenx); // Blit a flat array 'data' of RGBA 32-bit values to the ncplane 'nc', offset // from the upper left by 'placey' and 'placex'. Each row ought occupy // 'linesize' bytes (this might be greater than lenx * 4 due to padding). A // subregion of the input can be specified with 'begy'x'begx' and 'leny'x'lenx'. API int rgba_blit(struct ncplane* nc, int placey, int placex, int linesize, const unsigned char* data, int begy, int begx, int leny, int lenx); // 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); // selection widget -- an ncplane with a title header and a body section. the // body section supports infinite scrolling up and down. the widget looks like: // ╭──────────────────────────╮ // │This is the primary header│ // ╭──────────────────────this is the secondary header──────╮ // │ │ // │ option1 Long text #1 │ // │ option2 Long text #2 │ // │ option3 Long text #3 │ // │ option4 Long text #4 │ // │ option5 Long text #5 │ // │ option6 Long text #6 │ // │ │ // ╰────────────────────────────────────here's the footer───╯ // // At all times, exactly one item is selected. struct selector_item { char* option; char* desc; size_t opcolumns; // filled in by library size_t desccolumns; // filled in by library }; typedef struct selector_options { char* title; // title may be NULL, inhibiting riser, saving two rows. char* secondary; // secondary may be NULL char* footer; // footer may be NULL struct selector_item* items; // initial items and descriptions unsigned itemcount; // number of initial items and descriptions // default item (selected at start), must be < itemcount unless 'itemcount' // is 0, in which case 'defidx' must also be 0 unsigned defidx; // maximum number of options to display at once, 0 to use all available space unsigned maxdisplay; // exhaustive styling options uint64_t opchannels; // option channels uint64_t descchannels; // description channels uint64_t titlechannels;// title channels uint64_t footchannels; // secondary and footer channels uint64_t boxchannels; // border channels uint64_t bgchannels; // background channels, used only in body } selector_options; struct ncselector; API struct ncselector* ncselector_create(struct ncplane* n, int y, int x, const selector_options* opts); API struct ncselector* ncselector_aligned(struct ncplane* n, int y, ncalign_e align, const selector_options* opts); API int ncselector_additem(struct ncselector* n, const struct selector_item* item); API int ncselector_delitem(struct ncselector* n, const char* item); // Return a copy of the currently-selected option. NULL if there are no items. API char* ncselector_selected(const struct ncselector* n); API struct ncplane* ncselector_plane(struct ncselector* n); // Move up or down in the list. If 'newitem' is not NULL, the newly-selected // option will be strdup()ed and assigned to '*newitem' (and must be free()d by // the caller). API void ncselector_previtem(struct ncselector* n, char** newitem); API void ncselector_nextitem(struct ncselector* n, char** newitem); // Destroy the ncselector. If 'item' is not NULL, the last selected option will // be strdup()ed and assigned to '*item' (and must be free()d by the caller). API void ncselector_destroy(struct ncselector* n, char** item); // Menus. Horizontal menu bars are supported, on the top and/or bottom rows. // If the menu bar is longer than the screen, it will be only partially // visible. Menus may be either visible or invisible by default. In the event of // a screen resize, menus will be automatically moved/resized. Elements can be // dynamically enabled or disabled at all levels (menu, section, and item), typedef struct menu_options { bool bottom; // on the bottom row, as opposed to top row bool hiding; // hide the menu when not being used struct { char* name; // utf-8 c string struct { char* desc; // utf-8 menu item, NULL for horizontal separator ncinput shortcut; // shortcut, all should be distinct }* items; int itemcount; }* sections; // array of menu sections int sectioncount; // must be positive uint64_t headerchannels; // styling for header uint64_t sectionchannels; // styling for sections } menu_options; // Create a menu with the specified options. Menus are currently bound to an // overall notcurses object (as opposed to a particular plane), and are // implemented as ncplanes kept atop other ncplanes. API struct ncmenu* ncmenu_create(struct notcurses* nc, const menu_options* opts); // Unroll the specified menu section, making the menu visible if it was // invisible, and rolling up any menu section that is already unrolled. API int ncmenu_unroll(struct ncmenu* n, int sectionidx); // Roll up any unrolled menu section, and hide the menu if using hiding. API int ncmenu_rollup(struct ncmenu* n); // Destroy a menu created with ncmenu_create(). API int ncmenu_destroy(struct ncmenu* n); #undef API #ifdef __cplusplus } // extern "C" #endif #endif