x.c

   1 /* See LICENSE for license details. */
   2 #include <errno.h>
   3 #include <math.h>
   4 #include <limits.h>
   5 #include <locale.h>
   6 #include <signal.h>
   7 #include <sys/select.h>
   8 #include <time.h>
   9 #include <unistd.h>
  10 #include <libgen.h>
  11 #include <X11/Xatom.h>
  12 #include <X11/Xlib.h>
  13 #include <X11/cursorfont.h>
  14 #include <X11/keysym.h>
  15 #include <X11/Xft/Xft.h>
  16 #include <X11/XKBlib.h>
  17
  18 char *argv0;
  19 #include "arg.h"
  20 #include "st.h"
  21 #include "win.h"
  22
  23 /* types used in config.h */
  24 typedef struct {
  25         uint mod;
  26         KeySym keysym;
  27         void (*func)(const Arg *);
  28         const Arg arg;
  29 } Shortcut;
  30
  31 typedef struct {
  32         uint mod;
  33         uint button;
  34         void (*func)(const Arg *);
  35         const Arg arg;
  36         uint  release;
  37 } MouseShortcut;
  38
  39 typedef struct {
  40         KeySym k;
  41         uint mask;
  42         char *s;
  43         /* three-valued logic variables: 0 indifferent, 1 on, -1 off */
  44         signed char appkey;    /* application keypad */
  45         signed char appcursor; /* application cursor */
  46 } Key;
  47
  48 /* X modifiers */
  49 #define XK_ANY_MOD    UINT_MAX
  50 #define XK_NO_MOD     0
  51 #define XK_SWITCH_MOD (1<<13|1<<14)
  52
  53 /* function definitions used in config.h */
  54 static void clipcopy(const Arg *);
  55 static void clippaste(const Arg *);
  56 static void numlock(const Arg *);
  57 static void selpaste(const Arg *);
  58 static void zoom(const Arg *);
  59 static void zoomabs(const Arg *);
  60 static void zoomreset(const Arg *);
  61 static void ttysend(const Arg *);
  62
  63 /* config.h for applying patches and the configuration. */
  64 #include "config.h"
  65
  66 /* XEMBED messages */
  67 #define XEMBED_FOCUS_IN  4
  68 #define XEMBED_FOCUS_OUT 5
  69
  70 /* macros */
  71 #define IS_SET(flag)            ((win.mode & (flag)) != 0)
  72 #define TRUERED(x)              (((x) & 0xff0000) >> 8)
  73 #define TRUEGREEN(x)            (((x) & 0xff00))
  74 #define TRUEBLUE(x)             (((x) & 0xff) << 8)
  75
  76 typedef XftDraw *Draw;
  77 typedef XftColor Color;
  78 typedef XftGlyphFontSpec GlyphFontSpec;
  79
  80 /* Purely graphic info */
  81 typedef struct {
  82         int tw, th; /* tty width and height */
  83         int w, h; /* window width and height */
  84         int hborderpx, vborderpx;
  85         int ch; /* char height */
  86         int cw; /* char width  */
  87         int mode; /* window state/mode flags */
  88         int cursor; /* cursor style */
  89 } TermWindow;
  90
  91 typedef struct {
  92         Display *dpy;
  93         Colormap cmap;
  94         Window win;
  95         Drawable buf;
  96         GlyphFontSpec *specbuf; /* font spec buffer used for rendering */
  97         Atom xembed, wmdeletewin, netwmname, netwmiconname, netwmpid;
  98         struct {
  99                 XIM xim;
 100                 XIC xic;
 101                 XPoint spot;
 102                 XVaNestedList spotlist;
 103         } ime;
 104         Draw draw;
 105         Visual *vis;
 106         XSetWindowAttributes attrs;
 107         int scr;
 108         int isfixed; /* is fixed geometry? */
 109         int depth; /* bit depth */
 110         int l, t; /* left and top offset */
 111         int gm; /* geometry mask */
 112 } XWindow;
 113
 114 typedef struct {
 115         Atom xtarget;
 116         char *primary, *clipboard;
 117         struct timespec tclick1;
 118         struct timespec tclick2;
 119 } XSelection;
 120
 121 /* Font structure */
 122 #define Font Font_
 123 typedef struct {
 124         int height;
 125         int width;
 126         int ascent;
 127         int descent;
 128         int badslant;
 129         int badweight;
 130         short lbearing;
 131         short rbearing;
 132         XftFont *match;
 133         FcFontSet *set;
 134         FcPattern *pattern;
 135 } Font;
 136
 137 /* Drawing Context */
 138 typedef struct {
 139         Color *col;
 140         size_t collen;
 141         Font font, bfont, ifont, ibfont;
 142         GC gc;
 143 } DC;
 144
 145 static inline ushort sixd_to_16bit(int);
 146 static int xmakeglyphfontspecs(XftGlyphFontSpec *, const Glyph *, int, int, int);
 147 static void xdrawglyphfontspecs(const XftGlyphFontSpec *, Glyph, int, int, int);
 148 static void xdrawglyph(Glyph, int, int);
 149 static void xclear(int, int, int, int);
 150 static int xgeommasktogravity(int);
 151 static int ximopen(Display *);
 152 static void ximinstantiate(Display *, XPointer, XPointer);
 153 static void ximdestroy(XIM, XPointer, XPointer);
 154 static int xicdestroy(XIC, XPointer, XPointer);
 155 static void xinit(int, int);
 156 static void cresize(int, int);
 157 static void xresize(int, int);
 158 static void xhints(void);
 159 static int xloadcolor(int, const char *, Color *);
 160 static int xloadfont(Font *, FcPattern *);
 161 static void xloadfonts(const char *, double);
 162 static void xunloadfont(Font *);
 163 static void xunloadfonts(void);
 164 static void xsetenv(void);
 165 static void xseturgency(int);
 166 static int evcol(XEvent *);
 167 static int evrow(XEvent *);
 168
 169 static void expose(XEvent *);
 170 static void visibility(XEvent *);
 171 static void unmap(XEvent *);
 172 static void kpress(XEvent *);
 173 static void cmessage(XEvent *);
 174 static void resize(XEvent *);
 175 static void focus(XEvent *);
 176 static uint buttonmask(uint);
 177 static int mouseaction(XEvent *, uint);
 178 static void brelease(XEvent *);
 179 static void bpress(XEvent *);
 180 static void bmotion(XEvent *);
 181 static void propnotify(XEvent *);
 182 static void selnotify(XEvent *);
 183 static void selclear_(XEvent *);
 184 static void selrequest(XEvent *);
 185 static void setsel(char *, Time);
 186 static void mousesel(XEvent *, int);
 187 static void mousereport(XEvent *);
 188 static char *kmap(KeySym, uint);
 189 static int match(uint, uint);
 190
 191 static void run(void);
 192 static void usage(void);
 193
 194 static void (*handler[LASTEvent])(XEvent *) = {
 195         [KeyPress] = kpress,
 196         [ClientMessage] = cmessage,
 197         [ConfigureNotify] = resize,
 198         [VisibilityNotify] = visibility,
 199         [UnmapNotify] = unmap,
 200         [Expose] = expose,
 201         [FocusIn] = focus,
 202         [FocusOut] = focus,
 203         [MotionNotify] = bmotion,
 204         [ButtonPress] = bpress,
 205         [ButtonRelease] = brelease,
 206 /*
 207  * Uncomment if you want the selection to disappear when you select something
 208  * different in another window.
 209  */
 210 /*      [SelectionClear] = selclear_, */
 211         [SelectionNotify] = selnotify,
 212 /*
 213  * PropertyNotify is only turned on when there is some INCR transfer happening
 214  * for the selection retrieval.
 215  */
 216         [PropertyNotify] = propnotify,
 217         [SelectionRequest] = selrequest,
 218 };
 219
 220 /* Globals */
 221 static DC dc;
 222 static XWindow xw;
 223 static XSelection xsel;
 224 static TermWindow win;
 225
 226 /* Font Ring Cache */
 227 enum {
 228         FRC_NORMAL,
 229         FRC_ITALIC,
 230         FRC_BOLD,
 231         FRC_ITALICBOLD
 232 };
 233
 234 typedef struct {
 235         XftFont *font;
 236         int flags;
 237         Rune unicodep;
 238 } Fontcache;
 239
 240 /* Fontcache is an array now. A new font will be appended to the array. */
 241 static Fontcache *frc = NULL;
 242 static int frclen = 0;
 243 static int frccap = 0;
 244 static char *usedfont = NULL;
 245 static double usedfontsize = 0;
 246 static double defaultfontsize = 0;
 247
 248 static char *opt_alpha = NULL;
 249 static char *opt_class = NULL;
 250 static char **opt_cmd  = NULL;
 251 static char *opt_embed = NULL;
 252 static char *opt_font  = NULL;
 253 static char *opt_io    = NULL;
 254 static char *opt_line  = NULL;
 255 static char *opt_name  = NULL;
 256 static char *opt_title = NULL;
 257
 258 static uint buttons; /* bit field of pressed buttons */
 259
 260 void
 261 clipcopy(const Arg *dummy)
 262 {
 263         Atom clipboard;
 264
 265         free(xsel.clipboard);
 266         xsel.clipboard = NULL;
 267
 268         if (xsel.primary != NULL) {
 269                 xsel.clipboard = xstrdup(xsel.primary);
 270                 clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
 271                 XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
 272         }
 273 }
 274
 275 void
 276 clippaste(const Arg *dummy)
 277 {
 278         Atom clipboard;
 279
 280         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
 281         XConvertSelection(xw.dpy, clipboard, xsel.xtarget, clipboard,
 282                         xw.win, CurrentTime);
 283 }
 284
 285 void
 286 selpaste(const Arg *dummy)
 287 {
 288         XConvertSelection(xw.dpy, XA_PRIMARY, xsel.xtarget, XA_PRIMARY,
 289                         xw.win, CurrentTime);
 290 }
 291
 292 void
 293 numlock(const Arg *dummy)
 294 {
 295         win.mode ^= MODE_NUMLOCK;
 296 }
 297
 298 void
 299 zoom(const Arg *arg)
 300 {
 301         Arg larg;
 302
 303         larg.f = usedfontsize + arg->f;
 304         zoomabs(&larg);
 305 }
 306
 307 void
 308 zoomabs(const Arg *arg)
 309 {
 310         xunloadfonts();
 311         xloadfonts(usedfont, arg->f);
 312         cresize(0, 0);
 313         redraw();
 314         xhints();
 315 }
 316
 317 void
 318 zoomreset(const Arg *arg)
 319 {
 320         Arg larg;
 321
 322         if (defaultfontsize > 0) {
 323                 larg.f = defaultfontsize;
 324                 zoomabs(&larg);
 325         }
 326 }
 327
 328 void
 329 ttysend(const Arg *arg)
 330 {
 331         ttywrite(arg->s, strlen(arg->s), 1);
 332 }
 333
 334 int
 335 evcol(XEvent *e)
 336 {
 337         int x = e->xbutton.x - win.hborderpx;
 338         LIMIT(x, 0, win.tw - 1);
 339         return x / win.cw;
 340 }
 341
 342 int
 343 evrow(XEvent *e)
 344 {
 345         int y = e->xbutton.y - win.vborderpx;
 346         LIMIT(y, 0, win.th - 1);
 347         return y / win.ch;
 348 }
 349
 350 void
 351 mousesel(XEvent *e, int done)
 352 {
 353         int type, seltype = SEL_REGULAR;
 354         uint state = e->xbutton.state & ~(Button1Mask | forcemousemod);
 355
 356         for (type = 1; type < LEN(selmasks); ++type) {
 357                 if (match(selmasks[type], state)) {
 358                         seltype = type;
 359                         break;
 360                 }
 361         }
 362         selextend(evcol(e), evrow(e), seltype, done);
 363         if (done)
 364                 setsel(getsel(), e->xbutton.time);
 365 }
 366
 367 void
 368 mousereport(XEvent *e)
 369 {
 370         int len, btn, code;
 371         int x = evcol(e), y = evrow(e);
 372         int state = e->xbutton.state;
 373         char buf[40];
 374         static int ox, oy;
 375
 376         if (e->type == MotionNotify) {
 377                 if (x == ox && y == oy)
 378                         return;
 379                 if (!IS_SET(MODE_MOUSEMOTION) && !IS_SET(MODE_MOUSEMANY))
 380                         return;
 381                 /* MODE_MOUSEMOTION: no reporting if no button is pressed */
 382                 if (IS_SET(MODE_MOUSEMOTION) && buttons == 0)
 383                         return;
 384                 /* Set btn to lowest-numbered pressed button, or 12 if no
 385                  * buttons are pressed. */
 386                 for (btn = 1; btn <= 11 && !(buttons & (1<<(btn-1))); btn++)
 387                         ;
 388                 code = 32;
 389         } else {
 390                 btn = e->xbutton.button;
 391                 /* Only buttons 1 through 11 can be encoded */
 392                 if (btn < 1 || btn > 11)
 393                         return;
 394                 if (e->type == ButtonRelease) {
 395                         /* MODE_MOUSEX10: no button release reporting */
 396                         if (IS_SET(MODE_MOUSEX10))
 397                                 return;
 398                         /* Don't send release events for the scroll wheel */
 399                         if (btn == 4 || btn == 5)
 400                                 return;
 401                 }
 402                 code = 0;
 403         }
 404
 405         ox = x;
 406         oy = y;
 407
 408         /* Encode btn into code. If no button is pressed for a motion event in
 409          * MODE_MOUSEMANY, then encode it as a release. */
 410         if ((!IS_SET(MODE_MOUSESGR) && e->type == ButtonRelease) || btn == 12)
 411                 code += 3;
 412         else if (btn >= 8)
 413                 code += 128 + btn - 8;
 414         else if (btn >= 4)
 415                 code += 64 + btn - 4;
 416         else
 417                 code += btn - 1;
 418
 419         if (!IS_SET(MODE_MOUSEX10)) {
 420                 code += ((state & ShiftMask  ) ?  4 : 0)
 421                       + ((state & Mod1Mask   ) ?  8 : 0) /* meta key: alt */
 422                       + ((state & ControlMask) ? 16 : 0);
 423         }
 424
 425         if (IS_SET(MODE_MOUSESGR)) {
 426                 len = snprintf(buf, sizeof(buf), "\033[<%d;%d;%d%c",
 427                                 code, x+1, y+1,
 428                                 e->type == ButtonRelease ? 'm' : 'M');
 429         } else if (x < 223 && y < 223) {
 430                 len = snprintf(buf, sizeof(buf), "\033[M%c%c%c",
 431                                 32+code, 32+x+1, 32+y+1);
 432         } else {
 433                 return;
 434         }
 435
 436         ttywrite(buf, len, 0);
 437 }
 438
 439 uint
 440 buttonmask(uint button)
 441 {
 442         return button == Button1 ? Button1Mask
 443              : button == Button2 ? Button2Mask
 444              : button == Button3 ? Button3Mask
 445              : button == Button4 ? Button4Mask
 446              : button == Button5 ? Button5Mask
 447              : 0;
 448 }
 449
 450 int
 451 mouseaction(XEvent *e, uint release)
 452 {
 453         MouseShortcut *ms;
 454
 455         /* ignore Button<N>mask for Button<N> - it's set on release */
 456         uint state = e->xbutton.state & ~buttonmask(e->xbutton.button);
 457
 458         for (ms = mshortcuts; ms < mshortcuts + LEN(mshortcuts); ms++) {
 459                 if (ms->release == release &&
 460                     ms->button == e->xbutton.button &&
 461                     (match(ms->mod, state) ||  /* exact or forced */
 462                      match(ms->mod, state & ~forcemousemod))) {
 463                         ms->func(&(ms->arg));
 464                         return 1;
 465                 }
 466         }
 467
 468         return 0;
 469 }
 470
 471 void
 472 bpress(XEvent *e)
 473 {
 474         int btn = e->xbutton.button;
 475         struct timespec now;
 476         int snap;
 477
 478         if (1 <= btn && btn <= 11)
 479                 buttons |= 1 << (btn-1);
 480
 481         if (IS_SET(MODE_MOUSE) && !(e->xbutton.state & forcemousemod)) {
 482                 mousereport(e);
 483                 return;
 484         }
 485
 486         if (mouseaction(e, 0))
 487                 return;
 488
 489         if (btn == Button1) {
 490                 /*
 491                  * If the user clicks below predefined timeouts specific
 492                  * snapping behaviour is exposed.
 493                  */
 494                 clock_gettime(CLOCK_MONOTONIC, &now);
 495                 if (TIMEDIFF(now, xsel.tclick2) <= tripleclicktimeout) {
 496                         snap = SNAP_LINE;
 497                 } else if (TIMEDIFF(now, xsel.tclick1) <= doubleclicktimeout) {
 498                         snap = SNAP_WORD;
 499                 } else {
 500                         snap = 0;
 501                 }
 502                 xsel.tclick2 = xsel.tclick1;
 503                 xsel.tclick1 = now;
 504
 505                 selstart(evcol(e), evrow(e), snap);
 506         }
 507 }
 508
 509 void
 510 propnotify(XEvent *e)
 511 {
 512         XPropertyEvent *xpev;
 513         Atom clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
 514
 515         xpev = &e->xproperty;
 516         if (xpev->state == PropertyNewValue &&
 517                         (xpev->atom == XA_PRIMARY ||
 518                          xpev->atom == clipboard)) {
 519                 selnotify(e);
 520         }
 521 }
 522
 523 void
 524 selnotify(XEvent *e)
 525 {
 526         ulong nitems, ofs, rem;
 527         int format;
 528         uchar *data, *last, *repl;
 529         Atom type, incratom, property = None;
 530
 531         incratom = XInternAtom(xw.dpy, "INCR", 0);
 532
 533         ofs = 0;
 534         if (e->type == SelectionNotify)
 535                 property = e->xselection.property;
 536         else if (e->type == PropertyNotify)
 537                 property = e->xproperty.atom;
 538
 539         if (property == None)
 540                 return;
 541
 542         do {
 543                 if (XGetWindowProperty(xw.dpy, xw.win, property, ofs,
 544                                         BUFSIZ/4, False, AnyPropertyType,
 545                                         &type, &format, &nitems, &rem,
 546                                         &data)) {
 547                         fprintf(stderr, "Clipboard allocation failed\n");
 548                         return;
 549                 }
 550
 551                 if (e->type == PropertyNotify && nitems == 0 && rem == 0) {
 552                         /*
 553                          * If there is some PropertyNotify with no data, then
 554                          * this is the signal of the selection owner that all
 555                          * data has been transferred. We won't need to receive
 556                          * PropertyNotify events anymore.
 557                          */
 558                         MODBIT(xw.attrs.event_mask, 0, PropertyChangeMask);
 559                         XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask,
 560                                         &xw.attrs);
 561                 }
 562
 563                 if (type == incratom) {
 564                         /*
 565                          * Activate the PropertyNotify events so we receive
 566                          * when the selection owner does send us the next
 567                          * chunk of data.
 568                          */
 569                         MODBIT(xw.attrs.event_mask, 1, PropertyChangeMask);
 570                         XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask,
 571                                         &xw.attrs);
 572
 573                         /*
 574                          * Deleting the property is the transfer start signal.
 575                          */
 576                         XDeleteProperty(xw.dpy, xw.win, (int)property);
 577                         continue;
 578                 }
 579
 580                 /*
 581                  * As seen in getsel:
 582                  * Line endings are inconsistent in the terminal and GUI world
 583                  * copy and pasting. When receiving some selection data,
 584                  * replace all '\n' with '\r'.
 585                  * FIXME: Fix the computer world.
 586                  */
 587                 repl = data;
 588                 last = data + nitems * format / 8;
 589                 while ((repl = memchr(repl, '\n', last - repl))) {
 590                         *repl++ = '\r';
 591                 }
 592
 593                 if (IS_SET(MODE_BRCKTPASTE) && ofs == 0)
 594                         ttywrite("\033[200~", 6, 0);
 595                 ttywrite((char *)data, nitems * format / 8, 1);
 596                 if (IS_SET(MODE_BRCKTPASTE) && rem == 0)
 597                         ttywrite("\033[201~", 6, 0);
 598                 XFree(data);
 599                 /* number of 32-bit chunks returned */
 600                 ofs += nitems * format / 32;
 601         } while (rem > 0);
 602
 603         /*
 604          * Deleting the property again tells the selection owner to send the
 605          * next data chunk in the property.
 606          */
 607         XDeleteProperty(xw.dpy, xw.win, (int)property);
 608 }
 609
 610 void
 611 xclipcopy(void)
 612 {
 613         clipcopy(NULL);
 614 }
 615
 616 void
 617 selclear_(XEvent *e)
 618 {
 619         selclear();
 620 }
 621
 622 void
 623 selrequest(XEvent *e)
 624 {
 625         XSelectionRequestEvent *xsre;
 626         XSelectionEvent xev;
 627         Atom xa_targets, string, clipboard;
 628         char *seltext;
 629
 630         xsre = (XSelectionRequestEvent *) e;
 631         xev.type = SelectionNotify;
 632         xev.requestor = xsre->requestor;
 633         xev.selection = xsre->selection;
 634         xev.target = xsre->target;
 635         xev.time = xsre->time;
 636         if (xsre->property == None)
 637                 xsre->property = xsre->target;
 638
 639         /* reject */
 640         xev.property = None;
 641
 642         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
 643         if (xsre->target == xa_targets) {
 644                 /* respond with the supported type */
 645                 string = xsel.xtarget;
 646                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
 647                                 XA_ATOM, 32, PropModeReplace,
 648                                 (uchar *) &string, 1);
 649                 xev.property = xsre->property;
 650         } else if (xsre->target == xsel.xtarget || xsre->target == XA_STRING) {
 651                 /*
 652                  * xith XA_STRING non ascii characters may be incorrect in the
 653                  * requestor. It is not our problem, use utf8.
 654                  */
 655                 clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
 656                 if (xsre->selection == XA_PRIMARY) {
 657                         seltext = xsel.primary;
 658                 } else if (xsre->selection == clipboard) {
 659                         seltext = xsel.clipboard;
 660                 } else {
 661                         fprintf(stderr,
 662                                 "Unhandled clipboard selection 0x%lx\n",
 663                                 xsre->selection);
 664                         return;
 665                 }
 666                 if (seltext != NULL) {
 667                         XChangeProperty(xsre->display, xsre->requestor,
 668                                         xsre->property, xsre->target,
 669                                         8, PropModeReplace,
 670                                         (uchar *)seltext, strlen(seltext));
 671                         xev.property = xsre->property;
 672                 }
 673         }
 674
 675         /* all done, send a notification to the listener */
 676         if (!XSendEvent(xsre->display, xsre->requestor, 1, 0, (XEvent *) &xev))
 677                 fprintf(stderr, "Error sending SelectionNotify event\n");
 678 }
 679
 680 void
 681 setsel(char *str, Time t)
 682 {
 683         if (!str)
 684                 return;
 685
 686         free(xsel.primary);
 687         xsel.primary = str;
 688
 689         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, t);
 690         if (XGetSelectionOwner(xw.dpy, XA_PRIMARY) != xw.win)
 691                 selclear();
 692 }
 693
 694 void
 695 xsetsel(char *str)
 696 {
 697         setsel(str, CurrentTime);
 698 }
 699
 700 void
 701 brelease(XEvent *e)
 702 {
 703         int btn = e->xbutton.button;
 704
 705         if (1 <= btn && btn <= 11)
 706                 buttons &= ~(1 << (btn-1));
 707
 708         if (IS_SET(MODE_MOUSE) && !(e->xbutton.state & forcemousemod)) {
 709                 mousereport(e);
 710                 return;
 711         }
 712
 713         if (mouseaction(e, 1))
 714                 return;
 715         if (btn == Button1)
 716                 mousesel(e, 1);
 717 }
 718
 719 void
 720 bmotion(XEvent *e)
 721 {
 722         if (IS_SET(MODE_MOUSE) && !(e->xbutton.state & forcemousemod)) {
 723                 mousereport(e);
 724                 return;
 725         }
 726
 727         mousesel(e, 0);
 728 }
 729
 730 void
 731 cresize(int width, int height)
 732 {
 733         int col, row;
 734
 735         if (width != 0)
 736                 win.w = width;
 737         if (height != 0)
 738                 win.h = height;
 739
 740         col = (win.w - 2 * borderpx) / win.cw;
 741         row = (win.h - 2 * borderpx) / win.ch;
 742         col = MAX(1, col);
 743         row = MAX(1, row);
 744
 745         win.hborderpx = (win.w - col * win.cw) / 2;
 746         win.vborderpx = (win.h - row * win.ch) / 2;
 747
 748         tresize(col, row);
 749         xresize(col, row);
 750         ttyresize(win.tw, win.th);
 751 }
 752
 753 void
 754 xresize(int col, int row)
 755 {
 756         win.tw = col * win.cw;
 757         win.th = row * win.ch;
 758
 759         XFreePixmap(xw.dpy, xw.buf);
 760         xw.buf = XCreatePixmap(xw.dpy, xw.win, win.w, win.h,
 761                         xw.depth);
 762         XftDrawChange(xw.draw, xw.buf);
 763         xclear(0, 0, win.w, win.h);
 764
 765         /* resize to new width */
 766         xw.specbuf = xrealloc(xw.specbuf, col * sizeof(GlyphFontSpec));
 767 }
 768
 769 ushort
 770 sixd_to_16bit(int x)
 771 {
 772         return x == 0 ? 0 : 0x3737 + 0x2828 * x;
 773 }
 774
 775 int
 776 xloadcolor(int i, const char *name, Color *ncolor)
 777 {
 778         XRenderColor color = { .alpha = 0xffff };
 779
 780         if (!name) {
 781                 if (BETWEEN(i, 16, 255)) { /* 256 color */
 782                         if (i < 6*6*6+16) { /* same colors as xterm */
 783                                 color.red   = sixd_to_16bit( ((i-16)/36)%6 );
 784                                 color.green = sixd_to_16bit( ((i-16)/6) %6 );
 785                                 color.blue  = sixd_to_16bit( ((i-16)/1) %6 );
 786                         } else { /* greyscale */
 787                                 color.red = 0x0808 + 0x0a0a * (i - (6*6*6+16));
 788                                 color.green = color.blue = color.red;
 789                         }
 790                         return XftColorAllocValue(xw.dpy, xw.vis,
 791                                                   xw.cmap, &color, ncolor);
 792                 } else
 793                         name = colorname[i];
 794         }
 795
 796         return XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, ncolor);
 797 }
 798
 799 void
 800 xloadcols(void)
 801 {
 802         int i;
 803         static int loaded;
 804         Color *cp;
 805
 806         if (loaded) {
 807                 for (cp = dc.col; cp < &dc.col[dc.collen]; ++cp)
 808                         XftColorFree(xw.dpy, xw.vis, xw.cmap, cp);
 809         } else {
 810                 dc.collen = MAX(LEN(colorname), 256);
 811                 dc.col = xmalloc(dc.collen * sizeof(Color));
 812         }
 813
 814         for (i = 0; i < dc.collen; i++)
 815                 if (!xloadcolor(i, NULL, &dc.col[i])) {
 816                         if (colorname[i])
 817                                 die("could not allocate color '%s'\n", colorname[i]);
 818                         else
 819                                 die("could not allocate color %d\n", i);
 820                 }
 821
 822         /* set alpha value of bg color */
 823         if (opt_alpha)
 824                 alpha = strtof(opt_alpha, NULL);
 825         dc.col[defaultbg].color.alpha = (unsigned short)(0xffff * alpha);
 826         dc.col[defaultbg].pixel &= 0x00FFFFFF;
 827         dc.col[defaultbg].pixel |= (unsigned char)(0xff * alpha) << 24;
 828         loaded = 1;
 829 }
 830
 831 int
 832 xgetcolor(int x, unsigned char *r, unsigned char *g, unsigned char *b)
 833 {
 834         if (!BETWEEN(x, 0, dc.collen))
 835                 return 1;
 836
 837         *r = dc.col[x].color.red >> 8;
 838         *g = dc.col[x].color.green >> 8;
 839         *b = dc.col[x].color.blue >> 8;
 840
 841         return 0;
 842 }
 843
 844 int
 845 xsetcolorname(int x, const char *name)
 846 {
 847         Color ncolor;
 848
 849         if (!BETWEEN(x, 0, dc.collen))
 850                 return 1;
 851
 852         if (!xloadcolor(x, name, &ncolor))
 853                 return 1;
 854
 855         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
 856         dc.col[x] = ncolor;
 857
 858         return 0;
 859 }
 860
 861 /*
 862  * Absolute coordinates.
 863  */
 864 void
 865 xclear(int x1, int y1, int x2, int y2)
 866 {
 867         XftDrawRect(xw.draw,
 868                         &dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
 869                         x1, y1, x2-x1, y2-y1);
 870 }
 871
 872 void
 873 xhints(void)
 874 {
 875         XClassHint class = {opt_name ? opt_name : termname,
 876                             opt_class ? opt_class : termname};
 877         XWMHints wm = {.flags = InputHint, .input = 1};
 878         XSizeHints *sizeh;
 879
 880         sizeh = XAllocSizeHints();
 881
 882         sizeh->flags = PSize | PResizeInc | PBaseSize | PMinSize;
 883         sizeh->height = win.h;
 884         sizeh->width = win.w;
 885         sizeh->height_inc = 1;
 886         sizeh->width_inc = 1;
 887         sizeh->base_height = 2 * borderpx;
 888         sizeh->base_width = 2 * borderpx;
 889         sizeh->min_height = win.ch + 2 * borderpx;
 890         sizeh->min_width = win.cw + 2 * borderpx;
 891         if (xw.isfixed) {
 892                 sizeh->flags |= PMaxSize;
 893                 sizeh->min_width = sizeh->max_width = win.w;
 894                 sizeh->min_height = sizeh->max_height = win.h;
 895         }
 896         if (xw.gm & (XValue|YValue)) {
 897                 sizeh->flags |= USPosition | PWinGravity;
 898                 sizeh->x = xw.l;
 899                 sizeh->y = xw.t;
 900                 sizeh->win_gravity = xgeommasktogravity(xw.gm);
 901         }
 902
 903         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm,
 904                         &class);
 905         XFree(sizeh);
 906 }
 907
 908 int
 909 xgeommasktogravity(int mask)
 910 {
 911         switch (mask & (XNegative|YNegative)) {
 912         case 0:
 913                 return NorthWestGravity;
 914         case XNegative:
 915                 return NorthEastGravity;
 916         case YNegative:
 917                 return SouthWestGravity;
 918         }
 919
 920         return SouthEastGravity;
 921 }
 922
 923 int
 924 xloadfont(Font *f, FcPattern *pattern)
 925 {
 926         FcPattern *configured;
 927         FcPattern *match;
 928         FcResult result;
 929         XGlyphInfo extents;
 930         int wantattr, haveattr;
 931
 932         /*
 933          * Manually configure instead of calling XftMatchFont
 934          * so that we can use the configured pattern for
 935          * "missing glyph" lookups.
 936          */
 937         configured = FcPatternDuplicate(pattern);
 938         if (!configured)
 939                 return 1;
 940
 941         FcConfigSubstitute(NULL, configured, FcMatchPattern);
 942         XftDefaultSubstitute(xw.dpy, xw.scr, configured);
 943
 944         match = FcFontMatch(NULL, configured, &result);
 945         if (!match) {
 946                 FcPatternDestroy(configured);
 947                 return 1;
 948         }
 949
 950         if (!(f->match = XftFontOpenPattern(xw.dpy, match))) {
 951                 FcPatternDestroy(configured);
 952                 FcPatternDestroy(match);
 953                 return 1;
 954         }
 955
 956         if ((XftPatternGetInteger(pattern, "slant", 0, &wantattr) ==
 957             XftResultMatch)) {
 958                 /*
 959                  * Check if xft was unable to find a font with the appropriate
 960                  * slant but gave us one anyway. Try to mitigate.
 961                  */
 962                 if ((XftPatternGetInteger(f->match->pattern, "slant", 0,
 963                     &haveattr) != XftResultMatch) || haveattr < wantattr) {
 964                         f->badslant = 1;
 965                         fputs("font slant does not match\n", stderr);
 966                 }
 967         }
 968
 969         if ((XftPatternGetInteger(pattern, "weight", 0, &wantattr) ==
 970             XftResultMatch)) {
 971                 if ((XftPatternGetInteger(f->match->pattern, "weight", 0,
 972                     &haveattr) != XftResultMatch) || haveattr != wantattr) {
 973                         f->badweight = 1;
 974                         fputs("font weight does not match\n", stderr);
 975                 }
 976         }
 977
 978         XftTextExtentsUtf8(xw.dpy, f->match,
 979                 (const FcChar8 *) ascii_printable,
 980                 strlen(ascii_printable), &extents);
 981
 982         f->set = NULL;
 983         f->pattern = configured;
 984
 985         f->ascent = f->match->ascent;
 986         f->descent = f->match->descent;
 987         f->lbearing = 0;
 988         f->rbearing = f->match->max_advance_width;
 989
 990         f->height = f->ascent + f->descent;
 991         f->width = DIVCEIL(extents.xOff, strlen(ascii_printable));
 992
 993         return 0;
 994 }
 995
 996 void
 997 xloadfonts(const char *fontstr, double fontsize)
 998 {
 999         FcPattern *pattern;
1000         double fontval;
1001
1002         if (fontstr[0] == '-')
1003                 pattern = XftXlfdParse(fontstr, False, False);
1004         else
1005                 pattern = FcNameParse((const FcChar8 *)fontstr);
1006
1007         if (!pattern)
1008                 die("can't open font %s\n", fontstr);
1009
1010         if (fontsize > 1) {
1011                 FcPatternDel(pattern, FC_PIXEL_SIZE);
1012                 FcPatternDel(pattern, FC_SIZE);
1013                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
1014                 usedfontsize = fontsize;
1015         } else {
1016                 if (FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval) ==
1017                                 FcResultMatch) {
1018                         usedfontsize = fontval;
1019                 } else if (FcPatternGetDouble(pattern, FC_SIZE, 0, &fontval) ==
1020                                 FcResultMatch) {
1021                         usedfontsize = -1;
1022                 } else {
1023                         /*
1024                          * Default font size is 12, if none given. This is to
1025                          * have a known usedfontsize value.
1026                          */
1027                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
1028                         usedfontsize = 12;
1029                 }
1030                 defaultfontsize = usedfontsize;
1031         }
1032
1033         if (xloadfont(&dc.font, pattern))
1034                 die("can't open font %s\n", fontstr);
1035
1036         if (usedfontsize < 0) {
1037                 FcPatternGetDouble(dc.font.match->pattern,
1038                                    FC_PIXEL_SIZE, 0, &fontval);
1039                 usedfontsize = fontval;
1040                 if (fontsize == 0)
1041                         defaultfontsize = fontval;
1042         }
1043
1044         /* Setting character width and height. */
1045         win.cw = ceilf(dc.font.width * cwscale);
1046         win.ch = ceilf(dc.font.height * chscale);
1047
1048         FcPatternDel(pattern, FC_SLANT);
1049         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
1050         if (xloadfont(&dc.ifont, pattern))
1051                 die("can't open font %s\n", fontstr);
1052
1053         FcPatternDel(pattern, FC_WEIGHT);
1054         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
1055         if (xloadfont(&dc.ibfont, pattern))
1056                 die("can't open font %s\n", fontstr);
1057
1058         FcPatternDel(pattern, FC_SLANT);
1059         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
1060         if (xloadfont(&dc.bfont, pattern))
1061                 die("can't open font %s\n", fontstr);
1062
1063         FcPatternDestroy(pattern);
1064 }
1065
1066 void
1067 xunloadfont(Font *f)
1068 {
1069         XftFontClose(xw.dpy, f->match);
1070         FcPatternDestroy(f->pattern);
1071         if (f->set)
1072                 FcFontSetDestroy(f->set);
1073 }
1074
1075 void
1076 xunloadfonts(void)
1077 {
1078         /* Free the loaded fonts in the font cache.  */
1079         while (frclen > 0)
1080                 XftFontClose(xw.dpy, frc[--frclen].font);
1081
1082         xunloadfont(&dc.font);
1083         xunloadfont(&dc.bfont);
1084         xunloadfont(&dc.ifont);
1085         xunloadfont(&dc.ibfont);
1086 }
1087
1088 int
1089 ximopen(Display *dpy)
1090 {
1091         XIMCallback imdestroy = { .client_data = NULL, .callback = ximdestroy };
1092         XICCallback icdestroy = { .client_data = NULL, .callback = xicdestroy };
1093
1094         xw.ime.xim = XOpenIM(xw.dpy, NULL, NULL, NULL);
1095         if (xw.ime.xim == NULL)
1096                 return 0;
1097
1098         if (XSetIMValues(xw.ime.xim, XNDestroyCallback, &imdestroy, NULL))
1099                 fprintf(stderr, "XSetIMValues: "
1100                                 "Could not set XNDestroyCallback.\n");
1101
1102         xw.ime.spotlist = XVaCreateNestedList(0, XNSpotLocation, &xw.ime.spot,
1103                                               NULL);
1104
1105         if (xw.ime.xic == NULL) {
1106                 xw.ime.xic = XCreateIC(xw.ime.xim, XNInputStyle,
1107                                        XIMPreeditNothing | XIMStatusNothing,
1108                                        XNClientWindow, xw.win,
1109                                        XNDestroyCallback, &icdestroy,
1110                                        NULL);
1111         }
1112         if (xw.ime.xic == NULL)
1113                 fprintf(stderr, "XCreateIC: Could not create input context.\n");
1114
1115         return 1;
1116 }
1117
1118 void
1119 ximinstantiate(Display *dpy, XPointer client, XPointer call)
1120 {
1121         if (ximopen(dpy))
1122                 XUnregisterIMInstantiateCallback(xw.dpy, NULL, NULL, NULL,
1123                                                  ximinstantiate, NULL);
1124 }
1125
1126 void
1127 ximdestroy(XIM xim, XPointer client, XPointer call)
1128 {
1129         xw.ime.xim = NULL;
1130         XRegisterIMInstantiateCallback(xw.dpy, NULL, NULL, NULL,
1131                                        ximinstantiate, NULL);
1132         XFree(xw.ime.spotlist);
1133 }
1134
1135 int
1136 xicdestroy(XIC xim, XPointer client, XPointer call)
1137 {
1138         xw.ime.xic = NULL;
1139         return 1;
1140 }
1141
1142 void
1143 xinit(int cols, int rows)
1144 {
1145         XGCValues gcvalues;
1146         Cursor cursor;
1147         Window parent;
1148         pid_t thispid = getpid();
1149         XColor xmousefg, xmousebg;
1150         XWindowAttributes attr;
1151         XVisualInfo vis;
1152
1153         if (!(xw.dpy = XOpenDisplay(NULL)))
1154                 die("can't open display\n");
1155         xw.scr = XDefaultScreen(xw.dpy);
1156
1157         if (!(opt_embed && (parent = strtol(opt_embed, NULL, 0)))) {
1158                 parent = XRootWindow(xw.dpy, xw.scr);
1159                 xw.depth = 32;
1160         } else {
1161                 XGetWindowAttributes(xw.dpy, parent, &attr);
1162                 xw.depth = attr.depth;
1163         }
1164
1165         XMatchVisualInfo(xw.dpy, xw.scr, xw.depth, TrueColor, &vis);
1166         xw.vis = vis.visual;
1167
1168         /* font */
1169         if (!FcInit())
1170                 die("could not init fontconfig.\n");
1171
1172         usedfont = (opt_font == NULL)? font : opt_font;
1173         xloadfonts(usedfont, 0);
1174
1175         /* colors */
1176         xw.cmap = XCreateColormap(xw.dpy, parent, xw.vis, None);
1177         xloadcols();
1178
1179         /* adjust fixed window geometry */
1180         win.w = 2 * win.hborderpx + 2 * borderpx + cols * win.cw;
1181         win.h = 2 * win.vborderpx + 2 * borderpx + rows * win.ch;
1182         if (xw.gm & XNegative)
1183                 xw.l += DisplayWidth(xw.dpy, xw.scr) - win.w - 2;
1184         if (xw.gm & YNegative)
1185                 xw.t += DisplayHeight(xw.dpy, xw.scr) - win.h - 2;
1186
1187         /* Events */
1188         xw.attrs.background_pixel = dc.col[defaultbg].pixel;
1189         xw.attrs.border_pixel = dc.col[defaultbg].pixel;
1190         xw.attrs.bit_gravity = NorthWestGravity;
1191         xw.attrs.event_mask = FocusChangeMask | KeyPressMask | KeyReleaseMask
1192                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
1193                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
1194         xw.attrs.colormap = xw.cmap;
1195
1196         xw.win = XCreateWindow(xw.dpy, parent, xw.l, xw.t,
1197                         win.w, win.h, 0, xw.depth, InputOutput,
1198                         xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity
1199                         | CWEventMask | CWColormap, &xw.attrs);
1200
1201         memset(&gcvalues, 0, sizeof(gcvalues));
1202         gcvalues.graphics_exposures = False;
1203         xw.buf = XCreatePixmap(xw.dpy, xw.win, win.w, win.h, xw.depth);
1204         dc.gc = XCreateGC(xw.dpy, xw.buf, GCGraphicsExposures, &gcvalues);
1205         XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
1206         XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, win.w, win.h);
1207
1208         /* font spec buffer */
1209         xw.specbuf = xmalloc(cols * sizeof(GlyphFontSpec));
1210
1211         /* Xft rendering context */
1212         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
1213
1214         /* input methods */
1215         if (!ximopen(xw.dpy)) {
1216                 XRegisterIMInstantiateCallback(xw.dpy, NULL, NULL, NULL,
1217                                                ximinstantiate, NULL);
1218         }
1219
1220         /* white cursor, black outline */
1221         cursor = XCreateFontCursor(xw.dpy, mouseshape);
1222         XDefineCursor(xw.dpy, xw.win, cursor);
1223
1224         if (XParseColor(xw.dpy, xw.cmap, colorname[mousefg], &xmousefg) == 0) {
1225                 xmousefg.red   = 0xffff;
1226                 xmousefg.green = 0xffff;
1227                 xmousefg.blue  = 0xffff;
1228         }
1229
1230         if (XParseColor(xw.dpy, xw.cmap, colorname[mousebg], &xmousebg) == 0) {
1231                 xmousebg.red   = 0x0000;
1232                 xmousebg.green = 0x0000;
1233                 xmousebg.blue  = 0x0000;
1234         }
1235
1236         XRecolorCursor(xw.dpy, cursor, &xmousefg, &xmousebg);
1237
1238         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
1239         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
1240         xw.netwmname = XInternAtom(xw.dpy, "_NET_WM_NAME", False);
1241         xw.netwmiconname = XInternAtom(xw.dpy, "_NET_WM_ICON_NAME", False);
1242         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
1243
1244         xw.netwmpid = XInternAtom(xw.dpy, "_NET_WM_PID", False);
1245         XChangeProperty(xw.dpy, xw.win, xw.netwmpid, XA_CARDINAL, 32,
1246                         PropModeReplace, (uchar *)&thispid, 1);
1247
1248         win.mode = MODE_NUMLOCK;
1249         resettitle();
1250         xhints();
1251         XMapWindow(xw.dpy, xw.win);
1252         XSync(xw.dpy, False);
1253
1254         clock_gettime(CLOCK_MONOTONIC, &xsel.tclick1);
1255         clock_gettime(CLOCK_MONOTONIC, &xsel.tclick2);
1256         xsel.primary = NULL;
1257         xsel.clipboard = NULL;
1258         xsel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
1259         if (xsel.xtarget == None)
1260                 xsel.xtarget = XA_STRING;
1261 }
1262
1263 int
1264 xmakeglyphfontspecs(XftGlyphFontSpec *specs, const Glyph *glyphs, int len, int x, int y)
1265 {
1266         float winx = win.hborderpx + x * win.cw, winy = win.vborderpx + y * win.ch, xp, yp;
1267         ushort mode, prevmode = USHRT_MAX;
1268         Font *font = &dc.font;
1269         int frcflags = FRC_NORMAL;
1270         float runewidth = win.cw;
1271         Rune rune;
1272         FT_UInt glyphidx;
1273         FcResult fcres;
1274         FcPattern *fcpattern, *fontpattern;
1275         FcFontSet *fcsets[] = { NULL };
1276         FcCharSet *fccharset;
1277         int i, f, numspecs = 0;
1278
1279         for (i = 0, xp = winx, yp = winy + font->ascent; i < len; ++i) {
1280                 /* Fetch rune and mode for current glyph. */
1281                 rune = glyphs[i].u;
1282                 mode = glyphs[i].mode;
1283
1284                 /* Skip dummy wide-character spacing. */
1285                 if (mode == ATTR_WDUMMY)
1286                         continue;
1287
1288                 /* Determine font for glyph if different from previous glyph. */
1289                 if (prevmode != mode) {
1290                         prevmode = mode;
1291                         font = &dc.font;
1292                         frcflags = FRC_NORMAL;
1293                         runewidth = win.cw * ((mode & ATTR_WIDE) ? 2.0f : 1.0f);
1294                         if ((mode & ATTR_ITALIC) && (mode & ATTR_BOLD)) {
1295                                 font = &dc.ibfont;
1296                                 frcflags = FRC_ITALICBOLD;
1297                         } else if (mode & ATTR_ITALIC) {
1298                                 font = &dc.ifont;
1299                                 frcflags = FRC_ITALIC;
1300                         } else if (mode & ATTR_BOLD) {
1301                                 font = &dc.bfont;
1302                                 frcflags = FRC_BOLD;
1303                         }
1304                         yp = winy + font->ascent;
1305                 }
1306
1307                 /* Lookup character index with default font. */
1308                 glyphidx = XftCharIndex(xw.dpy, font->match, rune);
1309                 if (glyphidx) {
1310                         specs[numspecs].font = font->match;
1311                         specs[numspecs].glyph = glyphidx;
1312                         specs[numspecs].x = (short)xp;
1313                         specs[numspecs].y = (short)yp;
1314                         xp += runewidth;
1315                         numspecs++;
1316                         continue;
1317                 }
1318
1319                 /* Fallback on font cache, search the font cache for match. */
1320                 for (f = 0; f < frclen; f++) {
1321                         glyphidx = XftCharIndex(xw.dpy, frc[f].font, rune);
1322                         /* Everything correct. */
1323                         if (glyphidx && frc[f].flags == frcflags)
1324                                 break;
1325                         /* We got a default font for a not found glyph. */
1326                         if (!glyphidx && frc[f].flags == frcflags
1327                                         && frc[f].unicodep == rune) {
1328                                 break;
1329                         }
1330                 }
1331
1332                 /* Nothing was found. Use fontconfig to find matching font. */
1333                 if (f >= frclen) {
1334                         if (!font->set)
1335                                 font->set = FcFontSort(0, font->pattern,
1336                                                        1, 0, &fcres);
1337                         fcsets[0] = font->set;
1338
1339                         /*
1340                          * Nothing was found in the cache. Now use
1341                          * some dozen of Fontconfig calls to get the
1342                          * font for one single character.
1343                          *
1344                          * Xft and fontconfig are design failures.
1345                          */
1346                         fcpattern = FcPatternDuplicate(font->pattern);
1347                         fccharset = FcCharSetCreate();
1348
1349                         FcCharSetAddChar(fccharset, rune);
1350                         FcPatternAddCharSet(fcpattern, FC_CHARSET,
1351                                         fccharset);
1352                         FcPatternAddBool(fcpattern, FC_SCALABLE, 1);
1353
1354                         FcConfigSubstitute(0, fcpattern,
1355                                         FcMatchPattern);
1356                         FcDefaultSubstitute(fcpattern);
1357
1358                         fontpattern = FcFontSetMatch(0, fcsets, 1,
1359                                         fcpattern, &fcres);
1360
1361                         /* Allocate memory for the new cache entry. */
1362                         if (frclen >= frccap) {
1363                                 frccap += 16;
1364                                 frc = xrealloc(frc, frccap * sizeof(Fontcache));
1365                         }
1366
1367                         frc[frclen].font = XftFontOpenPattern(xw.dpy,
1368                                         fontpattern);
1369                         if (!frc[frclen].font)
1370                                 die("XftFontOpenPattern failed seeking fallback font: %s\n",
1371                                         strerror(errno));
1372                         frc[frclen].flags = frcflags;
1373                         frc[frclen].unicodep = rune;
1374
1375                         glyphidx = XftCharIndex(xw.dpy, frc[frclen].font, rune);
1376
1377                         f = frclen;
1378                         frclen++;
1379
1380                         FcPatternDestroy(fcpattern);
1381                         FcCharSetDestroy(fccharset);
1382                 }
1383
1384                 specs[numspecs].font = frc[f].font;
1385                 specs[numspecs].glyph = glyphidx;
1386                 specs[numspecs].x = (short)xp;
1387                 specs[numspecs].y = (short)yp;
1388                 xp += runewidth;
1389                 numspecs++;
1390         }
1391
1392         return numspecs;
1393 }
1394
1395 void
1396 xdrawglyphfontspecs(const XftGlyphFontSpec *specs, Glyph base, int len, int x, int y)
1397 {
1398         int charlen = len * ((base.mode & ATTR_WIDE) ? 2 : 1);
1399         int winx = win.hborderpx + x * win.cw, winy = win.vborderpx + y * win.ch,
1400             width = charlen * win.cw;
1401         Color *fg, *bg, *temp, revfg, revbg, truefg, truebg;
1402         XRenderColor colfg, colbg;
1403         XRectangle r;
1404
1405         /* Fallback on color display for attributes not supported by the font */
1406         if (base.mode & ATTR_ITALIC && base.mode & ATTR_BOLD) {
1407                 if (dc.ibfont.badslant || dc.ibfont.badweight)
1408                         base.fg = defaultattr;
1409         } else if ((base.mode & ATTR_ITALIC && dc.ifont.badslant) ||
1410             (base.mode & ATTR_BOLD && dc.bfont.badweight)) {
1411                 base.fg = defaultattr;
1412         }
1413
1414         if (IS_TRUECOL(base.fg)) {
1415                 colfg.alpha = 0xffff;
1416                 colfg.red = TRUERED(base.fg);
1417                 colfg.green = TRUEGREEN(base.fg);
1418                 colfg.blue = TRUEBLUE(base.fg);
1419                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &truefg);
1420                 fg = &truefg;
1421         } else {
1422                 fg = &dc.col[base.fg];
1423         }
1424
1425         if (IS_TRUECOL(base.bg)) {
1426                 colbg.alpha = 0xffff;
1427                 colbg.green = TRUEGREEN(base.bg);
1428                 colbg.red = TRUERED(base.bg);
1429                 colbg.blue = TRUEBLUE(base.bg);
1430                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &truebg);
1431                 bg = &truebg;
1432         } else {
1433                 bg = &dc.col[base.bg];
1434         }
1435
1436         /* Change basic system colors [0-7] to bright system colors [8-15] */
1437         if ((base.mode & ATTR_BOLD_FAINT) == ATTR_BOLD && BETWEEN(base.fg, 0, 7))
1438                 fg = &dc.col[base.fg + 8];
1439
1440         if (IS_SET(MODE_REVERSE)) {
1441                 if (fg == &dc.col[defaultfg]) {
1442                         fg = &dc.col[defaultbg];
1443                 } else {
1444                         colfg.red = ~fg->color.red;
1445                         colfg.green = ~fg->color.green;
1446                         colfg.blue = ~fg->color.blue;
1447                         colfg.alpha = fg->color.alpha;
1448                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg,
1449                                         &revfg);
1450                         fg = &revfg;
1451                 }
1452
1453                 if (bg == &dc.col[defaultbg]) {
1454                         bg = &dc.col[defaultfg];
1455                 } else {
1456                         colbg.red = ~bg->color.red;
1457                         colbg.green = ~bg->color.green;
1458                         colbg.blue = ~bg->color.blue;
1459                         colbg.alpha = bg->color.alpha;
1460                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg,
1461                                         &revbg);
1462                         bg = &revbg;
1463                 }
1464         }
1465
1466         if ((base.mode & ATTR_BOLD_FAINT) == ATTR_FAINT) {
1467                 colfg.red = fg->color.red / 2;
1468                 colfg.green = fg->color.green / 2;
1469                 colfg.blue = fg->color.blue / 2;
1470                 colfg.alpha = fg->color.alpha;
1471                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &revfg);
1472                 fg = &revfg;
1473         }
1474
1475         if (base.mode & ATTR_REVERSE) {
1476                 temp = fg;
1477                 fg = bg;
1478                 bg = temp;
1479         }
1480
1481         if (base.mode & ATTR_BLINK && win.mode & MODE_BLINK)
1482                 fg = bg;
1483
1484         if (base.mode & ATTR_INVISIBLE)
1485                 fg = bg;
1486
1487         /* Intelligent cleaning up of the borders. */
1488         if (x == 0) {
1489                 xclear(0, (y == 0)? 0 : winy, win.vborderpx,
1490                         winy + win.ch +
1491                         ((winy + win.ch >= win.vborderpx + win.th)? win.h : 0));
1492         }
1493         if (winx + width >= win.hborderpx + win.tw) {
1494                 xclear(winx + width, (y == 0)? 0 : winy, win.w,
1495                         ((winy + win.ch >= win.vborderpx + win.th)? win.h : (winy + win.ch)));
1496         }
1497         if (y == 0)
1498                 xclear(winx, 0, winx + width, win.vborderpx);
1499         if (winy + win.ch >= win.vborderpx + win.th)
1500                 xclear(winx, winy + win.ch, winx + width, win.h);
1501
1502         /* Clean up the region we want to draw to. */
1503         XftDrawRect(xw.draw, bg, winx, winy, width, win.ch);
1504
1505         /* Set the clip region because Xft is sometimes dirty. */
1506         r.x = 0;
1507         r.y = 0;
1508         r.height = win.ch;
1509         r.width = width;
1510         XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
1511
1512         /* Render the glyphs. */
1513         XftDrawGlyphFontSpec(xw.draw, fg, specs, len);
1514
1515         /* Render underline and strikethrough. */
1516         if (base.mode & ATTR_UNDERLINE) {
1517                 XftDrawRect(xw.draw, fg, winx, winy + dc.font.ascent * chscale + 1,
1518                                 width, 1);
1519         }
1520
1521         if (base.mode & ATTR_STRUCK) {
1522                 XftDrawRect(xw.draw, fg, winx, winy + 2 * dc.font.ascent * chscale / 3,
1523                                 width, 1);
1524         }
1525
1526         /* Reset clip to none. */
1527         XftDrawSetClip(xw.draw, 0);
1528 }
1529
1530 void
1531 xdrawglyph(Glyph g, int x, int y)
1532 {
1533         int numspecs;
1534         XftGlyphFontSpec spec;
1535
1536         numspecs = xmakeglyphfontspecs(&spec, &g, 1, x, y);
1537         xdrawglyphfontspecs(&spec, g, numspecs, x, y);
1538 }
1539
1540 void
1541 xdrawcursor(int cx, int cy, Glyph g, int ox, int oy, Glyph og)
1542 {
1543         Color drawcol;
1544
1545         /* remove the old cursor */
1546         if (selected(ox, oy))
1547                 og.mode ^= ATTR_REVERSE;
1548         xdrawglyph(og, ox, oy);
1549
1550         if (IS_SET(MODE_HIDE))
1551                 return;
1552
1553         /*
1554          * Select the right color for the right mode.
1555          */
1556         g.mode &= ATTR_BOLD|ATTR_ITALIC|ATTR_UNDERLINE|ATTR_STRUCK|ATTR_WIDE;
1557
1558         if (IS_SET(MODE_REVERSE)) {
1559                 g.mode |= ATTR_REVERSE;
1560                 g.bg = defaultfg;
1561                 if (selected(cx, cy)) {
1562                         drawcol = dc.col[defaultcs];
1563                         g.fg = defaultrcs;
1564                 } else {
1565                         drawcol = dc.col[defaultrcs];
1566                         g.fg = defaultcs;
1567                 }
1568         } else {
1569                 if (selected(cx, cy)) {
1570                         g.fg = defaultfg;
1571                         g.bg = defaultrcs;
1572                 } else {
1573                         g.fg = defaultbg;
1574                         g.bg = defaultcs;
1575                 }
1576                 drawcol = dc.col[g.bg];
1577         }
1578
1579         /* draw the new one */
1580         if (IS_SET(MODE_FOCUSED)) {
1581                 switch (win.cursor) {
1582                 case 7: /* st extension */
1583                         g.u = 0x2603; /* snowman (U+2603) */
1584                         /* FALLTHROUGH */
1585                 case 0: /* Blinking Block */
1586                 case 1: /* Blinking Block (Default) */
1587                 case 2: /* Steady Block */
1588                         xdrawglyph(g, cx, cy);
1589                         break;
1590                 case 3: /* Blinking Underline */
1591                 case 4: /* Steady Underline */
1592                         XftDrawRect(xw.draw, &drawcol,
1593                                         win.hborderpx + cx * win.cw,
1594                                         win.vborderpx + (cy + 1) * win.ch - \
1595                                                 cursorthickness,
1596                                         win.cw, cursorthickness);
1597                         break;
1598                 case 5: /* Blinking bar */
1599                 case 6: /* Steady bar */
1600                         XftDrawRect(xw.draw, &drawcol,
1601                                         win.hborderpx + cx * win.cw,
1602                                         win.vborderpx + cy * win.ch,
1603                                         cursorthickness, win.ch);
1604                         break;
1605                 }
1606         } else {
1607                 XftDrawRect(xw.draw, &drawcol,
1608                                 win.hborderpx + cx * win.cw,
1609                                 win.vborderpx + cy * win.ch,
1610                                 win.cw - 1, 1);
1611                 XftDrawRect(xw.draw, &drawcol,
1612                                 win.hborderpx + cx * win.cw,
1613                                 win.vborderpx + cy * win.ch,
1614                                 1, win.ch - 1);
1615                 XftDrawRect(xw.draw, &drawcol,
1616                                 win.hborderpx + (cx + 1) * win.cw - 1,
1617                                 win.vborderpx + cy * win.ch,
1618                                 1, win.ch - 1);
1619                 XftDrawRect(xw.draw, &drawcol,
1620                                 win.hborderpx + cx * win.cw,
1621                                 win.vborderpx + (cy + 1) * win.ch - 1,
1622                                 win.cw, 1);
1623         }
1624 }
1625
1626 void
1627 xsetenv(void)
1628 {
1629         char buf[sizeof(long) * 8 + 1];
1630
1631         snprintf(buf, sizeof(buf), "%lu", xw.win);
1632         setenv("WINDOWID", buf, 1);
1633 }
1634
1635 void
1636 xseticontitle(char *p)
1637 {
1638         XTextProperty prop;
1639         DEFAULT(p, opt_title);
1640
1641         if (Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
1642                                         &prop) != Success)
1643                 return;
1644         XSetWMIconName(xw.dpy, xw.win, &prop);
1645         XSetTextProperty(xw.dpy, xw.win, &prop, xw.netwmiconname);
1646         XFree(prop.value);
1647 }
1648
1649 void
1650 xsettitle(char *p)
1651 {
1652         XTextProperty prop;
1653         DEFAULT(p, opt_title);
1654
1655         if (Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
1656                                         &prop) != Success)
1657                 return;
1658         XSetWMName(xw.dpy, xw.win, &prop);
1659         XSetTextProperty(xw.dpy, xw.win, &prop, xw.netwmname);
1660         XFree(prop.value);
1661 }
1662
1663 int
1664 xstartdraw(void)
1665 {
1666         return IS_SET(MODE_VISIBLE);
1667 }
1668
1669 void
1670 xdrawline(Line line, int x1, int y1, int x2)
1671 {
1672         int i, x, ox, numspecs;
1673         Glyph base, new;
1674         XftGlyphFontSpec *specs = xw.specbuf;
1675
1676         numspecs = xmakeglyphfontspecs(specs, &line[x1], x2 - x1, x1, y1);
1677         i = ox = 0;
1678         for (x = x1; x < x2 && i < numspecs; x++) {
1679                 new = line[x];
1680                 if (new.mode == ATTR_WDUMMY)
1681                         continue;
1682                 if (selected(x, y1))
1683                         new.mode ^= ATTR_REVERSE;
1684                 if (i > 0 && ATTRCMP(base, new)) {
1685                         xdrawglyphfontspecs(specs, base, i, ox, y1);
1686                         specs += i;
1687                         numspecs -= i;
1688                         i = 0;
1689                 }
1690                 if (i == 0) {
1691                         ox = x;
1692                         base = new;
1693                 }
1694                 i++;
1695         }
1696         if (i > 0)
1697                 xdrawglyphfontspecs(specs, base, i, ox, y1);
1698 }
1699
1700 void
1701 xfinishdraw(void)
1702 {
1703         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, win.w,
1704                         win.h, 0, 0);
1705         XSetForeground(xw.dpy, dc.gc,
1706                         dc.col[IS_SET(MODE_REVERSE)?
1707                                 defaultfg : defaultbg].pixel);
1708 }
1709
1710 void
1711 xximspot(int x, int y)
1712 {
1713         if (xw.ime.xic == NULL)
1714                 return;
1715
1716         xw.ime.spot.x = borderpx + x * win.cw;
1717         xw.ime.spot.y = borderpx + (y + 1) * win.ch;
1718
1719         XSetICValues(xw.ime.xic, XNPreeditAttributes, xw.ime.spotlist, NULL);
1720 }
1721
1722 void
1723 expose(XEvent *ev)
1724 {
1725         redraw();
1726 }
1727
1728 void
1729 visibility(XEvent *ev)
1730 {
1731         XVisibilityEvent *e = &ev->xvisibility;
1732
1733         MODBIT(win.mode, e->state != VisibilityFullyObscured, MODE_VISIBLE);
1734 }
1735
1736 void
1737 unmap(XEvent *ev)
1738 {
1739         win.mode &= ~MODE_VISIBLE;
1740 }
1741
1742 void
1743 xsetpointermotion(int set)
1744 {
1745         MODBIT(xw.attrs.event_mask, set, PointerMotionMask);
1746         XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask, &xw.attrs);
1747 }
1748
1749 void
1750 xsetmode(int set, unsigned int flags)
1751 {
1752         int mode = win.mode;
1753         MODBIT(win.mode, set, flags);
1754         if ((win.mode & MODE_REVERSE) != (mode & MODE_REVERSE))
1755                 redraw();
1756 }
1757
1758 int
1759 xsetcursor(int cursor)
1760 {
1761         if (!BETWEEN(cursor, 0, 7)) /* 7: st extension */
1762                 return 1;
1763         win.cursor = cursor;
1764         return 0;
1765 }
1766
1767 void
1768 xseturgency(int add)
1769 {
1770         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
1771
1772         MODBIT(h->flags, add, XUrgencyHint);
1773         XSetWMHints(xw.dpy, xw.win, h);
1774         XFree(h);
1775 }
1776
1777 void
1778 xbell(void)
1779 {
1780         if (!(IS_SET(MODE_FOCUSED)))
1781                 xseturgency(1);
1782         if (bellvolume)
1783                 XkbBell(xw.dpy, xw.win, bellvolume, (Atom)NULL);
1784 }
1785
1786 void
1787 focus(XEvent *ev)
1788 {
1789         XFocusChangeEvent *e = &ev->xfocus;
1790
1791         if (e->mode == NotifyGrab)
1792                 return;
1793
1794         if (ev->type == FocusIn) {
1795                 if (xw.ime.xic)
1796                         XSetICFocus(xw.ime.xic);
1797                 win.mode |= MODE_FOCUSED;
1798                 xseturgency(0);
1799                 if (IS_SET(MODE_FOCUS))
1800                         ttywrite("\033[I", 3, 0);
1801         } else {
1802                 if (xw.ime.xic)
1803                         XUnsetICFocus(xw.ime.xic);
1804                 win.mode &= ~MODE_FOCUSED;
1805                 if (IS_SET(MODE_FOCUS))
1806                         ttywrite("\033[O", 3, 0);
1807         }
1808 }
1809
1810 int
1811 match(uint mask, uint state)
1812 {
1813         return mask == XK_ANY_MOD || mask == (state & ~ignoremod);
1814 }
1815
1816 char*
1817 kmap(KeySym k, uint state)
1818 {
1819         Key *kp;
1820         int i;
1821
1822         /* Check for mapped keys out of X11 function keys. */
1823         for (i = 0; i < LEN(mappedkeys); i++) {
1824                 if (mappedkeys[i] == k)
1825                         break;
1826         }
1827         if (i == LEN(mappedkeys)) {
1828                 if ((k & 0xFFFF) < 0xFD00)
1829                         return NULL;
1830         }
1831
1832         for (kp = key; kp < key + LEN(key); kp++) {
1833                 if (kp->k != k)
1834                         continue;
1835
1836                 if (!match(kp->mask, state))
1837                         continue;
1838
1839                 if (IS_SET(MODE_APPKEYPAD) ? kp->appkey < 0 : kp->appkey > 0)
1840                         continue;
1841                 if (IS_SET(MODE_NUMLOCK) && kp->appkey == 2)
1842                         continue;
1843
1844                 if (IS_SET(MODE_APPCURSOR) ? kp->appcursor < 0 : kp->appcursor > 0)
1845                         continue;
1846
1847                 return kp->s;
1848         }
1849
1850         return NULL;
1851 }
1852
1853 void
1854 kpress(XEvent *ev)
1855 {
1856         XKeyEvent *e = &ev->xkey;
1857         KeySym ksym;
1858         char buf[64], *customkey;
1859         int len;
1860         Rune c;
1861         Status status;
1862         Shortcut *bp;
1863
1864         if (IS_SET(MODE_KBDLOCK))
1865                 return;
1866
1867         if (xw.ime.xic)
1868                 len = XmbLookupString(xw.ime.xic, e, buf, sizeof buf, &ksym, &status);
1869         else
1870                 len = XLookupString(e, buf, sizeof buf, &ksym, NULL);
1871         /* 1. shortcuts */
1872         for (bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
1873                 if (ksym == bp->keysym && match(bp->mod, e->state)) {
1874                         bp->func(&(bp->arg));
1875                         return;
1876                 }
1877         }
1878
1879         /* 2. custom keys from config.h */
1880         if ((customkey = kmap(ksym, e->state))) {
1881                 ttywrite(customkey, strlen(customkey), 1);
1882                 return;
1883         }
1884
1885         /* 3. composed string from input method */
1886         if (len == 0)
1887                 return;
1888         if (len == 1 && e->state & Mod1Mask) {
1889                 if (IS_SET(MODE_8BIT)) {
1890                         if (*buf < 0177) {
1891                                 c = *buf | 0x80;
1892                                 len = utf8encode(c, buf);
1893                         }
1894                 } else {
1895                         buf[1] = buf[0];
1896                         buf[0] = '\033';
1897                         len = 2;
1898                 }
1899         }
1900         ttywrite(buf, len, 1);
1901 }
1902
1903 void
1904 cmessage(XEvent *e)
1905 {
1906         /*
1907          * See xembed specs
1908          *  http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
1909          */
1910         if (e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
1911                 if (e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
1912                         win.mode |= MODE_FOCUSED;
1913                         xseturgency(0);
1914                 } else if (e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
1915                         win.mode &= ~MODE_FOCUSED;
1916                 }
1917         } else if (e->xclient.data.l[0] == xw.wmdeletewin) {
1918                 ttyhangup();
1919                 exit(0);
1920         }
1921 }
1922
1923 void
1924 resize(XEvent *e)
1925 {
1926         if (e->xconfigure.width == win.w && e->xconfigure.height == win.h)
1927                 return;
1928
1929         cresize(e->xconfigure.width, e->xconfigure.height);
1930 }
1931
1932 void
1933 run(void)
1934 {
1935         XEvent ev;
1936         int w = win.w, h = win.h;
1937         fd_set rfd;
1938         int xfd = XConnectionNumber(xw.dpy), ttyfd, xev, drawing;
1939         struct timespec seltv, *tv, now, lastblink, trigger;
1940         double timeout;
1941
1942         /* Waiting for window mapping */
1943         do {
1944                 XNextEvent(xw.dpy, &ev);
1945                 /*
1946                  * This XFilterEvent call is required because of XOpenIM. It
1947                  * does filter out the key event and some client message for
1948                  * the input method too.
1949                  */
1950                 if (XFilterEvent(&ev, None))
1951                         continue;
1952                 if (ev.type == ConfigureNotify) {
1953                         w = ev.xconfigure.width;
1954                         h = ev.xconfigure.height;
1955                 }
1956         } while (ev.type != MapNotify);
1957
1958         ttyfd = ttynew(opt_line, shell, opt_io, opt_cmd);
1959         cresize(w, h);
1960
1961         for (timeout = -1, drawing = 0, lastblink = (struct timespec){0};;) {
1962                 FD_ZERO(&rfd);
1963                 FD_SET(ttyfd, &rfd);
1964                 FD_SET(xfd, &rfd);
1965
1966                 if (XPending(xw.dpy))
1967                         timeout = 0;  /* existing events might not set xfd */
1968
1969                 seltv.tv_sec = timeout / 1E3;
1970                 seltv.tv_nsec = 1E6 * (timeout - 1E3 * seltv.tv_sec);
1971                 tv = timeout >= 0 ? &seltv : NULL;
1972
1973                 if (pselect(MAX(xfd, ttyfd)+1, &rfd, NULL, NULL, tv, NULL) < 0) {
1974                         if (errno == EINTR)
1975                                 continue;
1976                         die("select failed: %s\n", strerror(errno));
1977                 }
1978                 clock_gettime(CLOCK_MONOTONIC, &now);
1979
1980                 if (FD_ISSET(ttyfd, &rfd))
1981                         ttyread();
1982
1983                 xev = 0;
1984                 while (XPending(xw.dpy)) {
1985                         xev = 1;
1986                         XNextEvent(xw.dpy, &ev);
1987                         if (XFilterEvent(&ev, None))
1988                                 continue;
1989                         if (handler[ev.type])
1990                                 (handler[ev.type])(&ev);
1991                 }
1992
1993                 /*
1994                  * To reduce flicker and tearing, when new content or event
1995                  * triggers drawing, we first wait a bit to ensure we got
1996                  * everything, and if nothing new arrives - we draw.
1997                  * We start with trying to wait minlatency ms. If more content
1998                  * arrives sooner, we retry with shorter and shorter periods,
1999                  * and eventually draw even without idle after maxlatency ms.
2000                  * Typically this results in low latency while interacting,
2001                  * maximum latency intervals during `cat huge.txt`, and perfect
2002                  * sync with periodic updates from animations/key-repeats/etc.
2003                  */
2004                 if (FD_ISSET(ttyfd, &rfd) || xev) {
2005                         if (!drawing) {
2006                                 trigger = now;
2007                                 drawing = 1;
2008                         }
2009                         timeout = (maxlatency - TIMEDIFF(now, trigger)) \
2010                                   / maxlatency * minlatency;
2011                         if (timeout > 0)
2012                                 continue;  /* we have time, try to find idle */
2013                 }
2014
2015                 /* idle detected or maxlatency exhausted -> draw */
2016                 timeout = -1;
2017                 if (blinktimeout && tattrset(ATTR_BLINK)) {
2018                         timeout = blinktimeout - TIMEDIFF(now, lastblink);
2019                         if (timeout <= 0) {
2020                                 if (-timeout > blinktimeout) /* start visible */
2021                                         win.mode |= MODE_BLINK;
2022                                 win.mode ^= MODE_BLINK;
2023                                 tsetdirtattr(ATTR_BLINK);
2024                                 lastblink = now;
2025                                 timeout = blinktimeout;
2026                         }
2027                 }
2028
2029                 draw();
2030                 XFlush(xw.dpy);
2031                 drawing = 0;
2032         }
2033 }
2034
2035 void
2036 usage(void)
2037 {
2038         die("usage: %s [-aiv] [-c class] [-f font] [-g geometry]"
2039             " [-n name] [-o file]\n"
2040             "          [-T title] [-t title] [-w windowid]"
2041             " [[-e] command [args ...]]\n"
2042             "       %s [-aiv] [-c class] [-f font] [-g geometry]"
2043             " [-n name] [-o file]\n"
2044             "          [-T title] [-t title] [-w windowid] -l line"
2045             " [stty_args ...]\n", argv0, argv0);
2046 }
2047
2048 int
2049 main(int argc, char *argv[])
2050 {
2051         xw.l = xw.t = 0;
2052         xw.isfixed = False;
2053         xsetcursor(cursorshape);
2054
2055         ARGBEGIN {
2056         case 'a':
2057                 allowaltscreen = 0;
2058                 break;
2059         case 'A':
2060                 opt_alpha = EARGF(usage());
2061                 break;
2062         case 'c':
2063                 opt_class = EARGF(usage());
2064                 break;
2065         case 'e':
2066                 if (argc > 0)
2067                         --argc, ++argv;
2068                 goto run;
2069         case 'f':
2070                 opt_font = EARGF(usage());
2071                 break;
2072         case 'g':
2073                 xw.gm = XParseGeometry(EARGF(usage()),
2074                                 &xw.l, &xw.t, &cols, &rows);
2075                 break;
2076         case 'i':
2077                 xw.isfixed = 1;
2078                 break;
2079         case 'o':
2080                 opt_io = EARGF(usage());
2081                 break;
2082         case 'l':
2083                 opt_line = EARGF(usage());
2084                 break;
2085         case 'n':
2086                 opt_name = EARGF(usage());
2087                 break;
2088         case 't':
2089         case 'T':
2090                 opt_title = EARGF(usage());
2091                 break;
2092         case 'w':
2093                 opt_embed = EARGF(usage());
2094                 break;
2095         case 'v':
2096                 die("%s " VERSION "\n", argv0);
2097                 break;
2098         default:
2099                 usage();
2100         } ARGEND;
2101
2102 run:
2103         if (argc > 0) /* eat all remaining arguments */
2104                 opt_cmd = argv;
2105
2106         if (!opt_title)
2107                 opt_title = (opt_line || !opt_cmd) ? "st" : opt_cmd[0];
2108
2109         setlocale(LC_CTYPE, "");
2110         XSetLocaleModifiers("");
2111         cols = MAX(cols, 1);
2112         rows = MAX(rows, 1);
2113         tnew(cols, rows);
2114         xinit(cols, rows);
2115         xsetenv();
2116         selinit();
2117         run();
2118
2119         return 0;
2120 }