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 #include <X11/Xresource.h>
  18
  19 char *argv0;
  20 #include "arg.h"
  21 #include "st.h"
  22 #include "win.h"
  23
  24 /* types used in config.h */
  25 typedef struct {
  26         uint mod;
  27         KeySym keysym;
  28         void (*func)(const Arg *);
  29         const Arg arg;
  30 } Shortcut;
  31
  32 typedef struct {
  33         uint mod;
  34         uint button;
  35         void (*func)(const Arg *);
  36         const Arg arg;
  37         uint  release;
  38         int  altscrn;  /* 0: don't care, -1: not alt screen, 1: alt screen */
  39 } MouseShortcut;
  40
  41 typedef struct {
  42         KeySym k;
  43         uint mask;
  44         char *s;
  45         /* three-valued logic variables: 0 indifferent, 1 on, -1 off */
  46         signed char appkey;    /* application keypad */
  47         signed char appcursor; /* application cursor */
  48 } Key;
  49
  50 /* Xresources preferences */
  51 enum resource_type {
  52         STRING = 0,
  53         INTEGER = 1,
  54         FLOAT = 2
  55 };
  56
  57 typedef struct {
  58         char *name;
  59         enum resource_type type;
  60         void *dst;
  61 } ResourcePref;
  62
  63 /* X modifiers */
  64 #define XK_ANY_MOD    UINT_MAX
  65 #define XK_NO_MOD     0
  66 #define XK_SWITCH_MOD (1<<13|1<<14)
  67
  68 /* function definitions used in config.h */
  69 static void clipcopy(const Arg *);
  70 static void clippaste(const Arg *);
  71 static void numlock(const Arg *);
  72 static void selpaste(const Arg *);
  73 static void zoom(const Arg *);
  74 static void zoomabs(const Arg *);
  75 static void zoomreset(const Arg *);
  76 static void ttysend(const Arg *);
  77
  78 /* config.h for applying patches and the configuration. */
  79 #include "config.h"
  80
  81 /* XEMBED messages */
  82 #define XEMBED_FOCUS_IN  4
  83 #define XEMBED_FOCUS_OUT 5
  84
  85 /* macros */
  86 #define IS_SET(flag)            ((win.mode & (flag)) != 0)
  87 #define TRUERED(x)              (((x) & 0xff0000) >> 8)
  88 #define TRUEGREEN(x)            (((x) & 0xff00))
  89 #define TRUEBLUE(x)             (((x) & 0xff) << 8)
  90
  91 typedef XftDraw *Draw;
  92 typedef XftColor Color;
  93 typedef XftGlyphFontSpec GlyphFontSpec;
  94
  95 /* Purely graphic info */
  96 typedef struct {
  97         int tw, th; /* tty width and height */
  98         int w, h; /* window width and height */
  99         int hborderpx, vborderpx;
 100         int ch; /* char height */
 101         int cw; /* char width  */
 102         int mode; /* window state/mode flags */
 103         int cursor; /* cursor style */
 104 } TermWindow;
 105
 106 typedef struct {
 107         Display *dpy;
 108         Colormap cmap;
 109         Window win;
 110         Drawable buf;
 111         GlyphFontSpec *specbuf; /* font spec buffer used for rendering */
 112         Atom xembed, wmdeletewin, netwmname, netwmiconname, netwmpid;
 113         struct {
 114                 XIM xim;
 115                 XIC xic;
 116                 XPoint spot;
 117                 XVaNestedList spotlist;
 118         } ime;
 119         Draw draw;
 120         Visual *vis;
 121         XSetWindowAttributes attrs;
 122         int scr;
 123         int isfixed; /* is fixed geometry? */
 124         int depth; /* bit depth */
 125         int l, t; /* left and top offset */
 126         int gm; /* geometry mask */
 127 } XWindow;
 128
 129 typedef struct {
 130         Atom xtarget;
 131         char *primary, *clipboard;
 132         struct timespec tclick1;
 133         struct timespec tclick2;
 134 } XSelection;
 135
 136 /* Font structure */
 137 #define Font Font_
 138 typedef struct {
 139         int height;
 140         int width;
 141         int ascent;
 142         int descent;
 143         int badslant;
 144         int badweight;
 145         short lbearing;
 146         short rbearing;
 147         XftFont *match;
 148         FcFontSet *set;
 149         FcPattern *pattern;
 150 } Font;
 151
 152 /* Drawing Context */
 153 typedef struct {
 154         Color *col;
 155         size_t collen;
 156         Font font, bfont, ifont, ibfont;
 157         GC gc;
 158 } DC;
 159
 160 static inline ushort sixd_to_16bit(int);
 161 static int xmakeglyphfontspecs(XftGlyphFontSpec *, const Glyph *, int, int, int);
 162 static void xdrawglyphfontspecs(const XftGlyphFontSpec *, Glyph, int, int, int);
 163 static void xdrawglyph(Glyph, int, int);
 164 static void xclear(int, int, int, int);
 165 static int xgeommasktogravity(int);
 166 static int ximopen(Display *);
 167 static void ximinstantiate(Display *, XPointer, XPointer);
 168 static void ximdestroy(XIM, XPointer, XPointer);
 169 static int xicdestroy(XIC, XPointer, XPointer);
 170 static void xinit(int, int);
 171 static void cresize(int, int);
 172 static void xresize(int, int);
 173 static void xhints(void);
 174 static int xloadcolor(int, const char *, Color *);
 175 static int xloadfont(Font *, FcPattern *);
 176 static void xloadfonts(const char *, double);
 177 static void xunloadfont(Font *);
 178 static void xunloadfonts(void);
 179 static void xsetenv(void);
 180 static void xseturgency(int);
 181 static int evcol(XEvent *);
 182 static int evrow(XEvent *);
 183
 184 static void expose(XEvent *);
 185 static void visibility(XEvent *);
 186 static void unmap(XEvent *);
 187 static void kpress(XEvent *);
 188 static void cmessage(XEvent *);
 189 static void resize(XEvent *);
 190 static void focus(XEvent *);
 191 static uint buttonmask(uint);
 192 static int mouseaction(XEvent *, uint);
 193 static void brelease(XEvent *);
 194 static void bpress(XEvent *);
 195 static void bmotion(XEvent *);
 196 static void propnotify(XEvent *);
 197 static void selnotify(XEvent *);
 198 static void selclear_(XEvent *);
 199 static void selrequest(XEvent *);
 200 static void setsel(char *, Time);
 201 static void mousesel(XEvent *, int);
 202 static void mousereport(XEvent *);
 203 static char *kmap(KeySym, uint);
 204 static int match(uint, uint);
 205
 206 static void run(void);
 207 static void usage(void);
 208
 209 static void (*handler[LASTEvent])(XEvent *) = {
 210         [KeyPress] = kpress,
 211         [ClientMessage] = cmessage,
 212         [ConfigureNotify] = resize,
 213         [VisibilityNotify] = visibility,
 214         [UnmapNotify] = unmap,
 215         [Expose] = expose,
 216         [FocusIn] = focus,
 217         [FocusOut] = focus,
 218         [MotionNotify] = bmotion,
 219         [ButtonPress] = bpress,
 220         [ButtonRelease] = brelease,
 221 /*
 222  * Uncomment if you want the selection to disappear when you select something
 223  * different in another window.
 224  */
 225 /*      [SelectionClear] = selclear_, */
 226         [SelectionNotify] = selnotify,
 227 /*
 228  * PropertyNotify is only turned on when there is some INCR transfer happening
 229  * for the selection retrieval.
 230  */
 231         [PropertyNotify] = propnotify,
 232         [SelectionRequest] = selrequest,
 233 };
 234
 235 /* Globals */
 236 static DC dc;
 237 static XWindow xw;
 238 static XSelection xsel;
 239 static TermWindow win;
 240
 241 /* Font Ring Cache */
 242 enum {
 243         FRC_NORMAL,
 244         FRC_ITALIC,
 245         FRC_BOLD,
 246         FRC_ITALICBOLD
 247 };
 248
 249 typedef struct {
 250         XftFont *font;
 251         int flags;
 252         Rune unicodep;
 253 } Fontcache;
 254
 255 /* Fontcache is an array now. A new font will be appended to the array. */
 256 static Fontcache *frc = NULL;
 257 static int frclen = 0;
 258 static int frccap = 0;
 259 static char *usedfont = NULL;
 260 static double usedfontsize = 0;
 261 static double defaultfontsize = 0;
 262
 263 static char *opt_alpha = NULL;
 264 static char *opt_class = NULL;
 265 static char **opt_cmd  = NULL;
 266 static char *opt_embed = NULL;
 267 static char *opt_font  = NULL;
 268 static char *opt_io    = NULL;
 269 static char *opt_line  = NULL;
 270 static char *opt_name  = NULL;
 271 static char *opt_title = NULL;
 272
 273 static uint buttons; /* bit field of pressed buttons */
 274
 275 void
 276 clipcopy(const Arg *dummy)
 277 {
 278         Atom clipboard;
 279
 280         free(xsel.clipboard);
 281         xsel.clipboard = NULL;
 282
 283         if (xsel.primary != NULL) {
 284                 xsel.clipboard = xstrdup(xsel.primary);
 285                 clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
 286                 XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
 287         }
 288 }
 289
 290 void
 291 clippaste(const Arg *dummy)
 292 {
 293         Atom clipboard;
 294
 295         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
 296         XConvertSelection(xw.dpy, clipboard, xsel.xtarget, clipboard,
 297                         xw.win, CurrentTime);
 298 }
 299
 300 void
 301 selpaste(const Arg *dummy)
 302 {
 303         XConvertSelection(xw.dpy, XA_PRIMARY, xsel.xtarget, XA_PRIMARY,
 304                         xw.win, CurrentTime);
 305 }
 306
 307 void
 308 numlock(const Arg *dummy)
 309 {
 310         win.mode ^= MODE_NUMLOCK;
 311 }
 312
 313 void
 314 zoom(const Arg *arg)
 315 {
 316         Arg larg;
 317
 318         larg.f = usedfontsize + arg->f;
 319         zoomabs(&larg);
 320 }
 321
 322 void
 323 zoomabs(const Arg *arg)
 324 {
 325         xunloadfonts();
 326         xloadfonts(usedfont, arg->f);
 327         cresize(0, 0);
 328         redraw();
 329         xhints();
 330 }
 331
 332 void
 333 zoomreset(const Arg *arg)
 334 {
 335         Arg larg;
 336
 337         if (defaultfontsize > 0) {
 338                 larg.f = defaultfontsize;
 339                 zoomabs(&larg);
 340         }
 341 }
 342
 343 void
 344 ttysend(const Arg *arg)
 345 {
 346         ttywrite(arg->s, strlen(arg->s), 1);
 347 }
 348
 349 int
 350 evcol(XEvent *e)
 351 {
 352         int x = e->xbutton.x - win.hborderpx;
 353         LIMIT(x, 0, win.tw - 1);
 354         return x / win.cw;
 355 }
 356
 357 int
 358 evrow(XEvent *e)
 359 {
 360         int y = e->xbutton.y - win.vborderpx;
 361         LIMIT(y, 0, win.th - 1);
 362         return y / win.ch;
 363 }
 364
 365 void
 366 mousesel(XEvent *e, int done)
 367 {
 368         int type, seltype = SEL_REGULAR;
 369         uint state = e->xbutton.state & ~(Button1Mask | forcemousemod);
 370
 371         for (type = 1; type < LEN(selmasks); ++type) {
 372                 if (match(selmasks[type], state)) {
 373                         seltype = type;
 374                         break;
 375                 }
 376         }
 377         selextend(evcol(e), evrow(e), seltype, done);
 378         if (done)
 379                 setsel(getsel(), e->xbutton.time);
 380 }
 381
 382 void
 383 mousereport(XEvent *e)
 384 {
 385         int len, btn, code;
 386         int x = evcol(e), y = evrow(e);
 387         int state = e->xbutton.state;
 388         char buf[40];
 389         static int ox, oy;
 390
 391         if (e->type == MotionNotify) {
 392                 if (x == ox && y == oy)
 393                         return;
 394                 if (!IS_SET(MODE_MOUSEMOTION) && !IS_SET(MODE_MOUSEMANY))
 395                         return;
 396                 /* MODE_MOUSEMOTION: no reporting if no button is pressed */
 397                 if (IS_SET(MODE_MOUSEMOTION) && buttons == 0)
 398                         return;
 399                 /* Set btn to lowest-numbered pressed button, or 12 if no
 400                  * buttons are pressed. */
 401                 for (btn = 1; btn <= 11 && !(buttons & (1<<(btn-1))); btn++)
 402                         ;
 403                 code = 32;
 404         } else {
 405                 btn = e->xbutton.button;
 406                 /* Only buttons 1 through 11 can be encoded */
 407                 if (btn < 1 || btn > 11)
 408                         return;
 409                 if (e->type == ButtonRelease) {
 410                         /* MODE_MOUSEX10: no button release reporting */
 411                         if (IS_SET(MODE_MOUSEX10))
 412                                 return;
 413                         /* Don't send release events for the scroll wheel */
 414                         if (btn == 4 || btn == 5)
 415                                 return;
 416                 }
 417                 code = 0;
 418         }
 419
 420         ox = x;
 421         oy = y;
 422
 423         /* Encode btn into code. If no button is pressed for a motion event in
 424          * MODE_MOUSEMANY, then encode it as a release. */
 425         if ((!IS_SET(MODE_MOUSESGR) && e->type == ButtonRelease) || btn == 12)
 426                 code += 3;
 427         else if (btn >= 8)
 428                 code += 128 + btn - 8;
 429         else if (btn >= 4)
 430                 code += 64 + btn - 4;
 431         else
 432                 code += btn - 1;
 433
 434         if (!IS_SET(MODE_MOUSEX10)) {
 435                 code += ((state & ShiftMask  ) ?  4 : 0)
 436                       + ((state & Mod1Mask   ) ?  8 : 0) /* meta key: alt */
 437                       + ((state & ControlMask) ? 16 : 0);
 438         }
 439
 440         if (IS_SET(MODE_MOUSESGR)) {
 441                 len = snprintf(buf, sizeof(buf), "\033[<%d;%d;%d%c",
 442                                 code, x+1, y+1,
 443                                 e->type == ButtonRelease ? 'm' : 'M');
 444         } else if (x < 223 && y < 223) {
 445                 len = snprintf(buf, sizeof(buf), "\033[M%c%c%c",
 446                                 32+code, 32+x+1, 32+y+1);
 447         } else {
 448                 return;
 449         }
 450
 451         ttywrite(buf, len, 0);
 452 }
 453
 454 uint
 455 buttonmask(uint button)
 456 {
 457         return button == Button1 ? Button1Mask
 458              : button == Button2 ? Button2Mask
 459              : button == Button3 ? Button3Mask
 460              : button == Button4 ? Button4Mask
 461              : button == Button5 ? Button5Mask
 462              : 0;
 463 }
 464
 465 int
 466 mouseaction(XEvent *e, uint release)
 467 {
 468         MouseShortcut *ms;
 469
 470         /* ignore Button<N>mask for Button<N> - it's set on release */
 471         uint state = e->xbutton.state & ~buttonmask(e->xbutton.button);
 472
 473         for (ms = mshortcuts; ms < mshortcuts + LEN(mshortcuts); ms++) {
 474                 if (ms->release == release &&
 475                     ms->button == e->xbutton.button &&
 476                     (!ms->altscrn || (ms->altscrn == (tisaltscr() ? 1 : -1))) &&
 477                     (match(ms->mod, state) ||  /* exact or forced */
 478                      match(ms->mod, state & ~forcemousemod))) {
 479                         ms->func(&(ms->arg));
 480                         return 1;
 481                 }
 482         }
 483
 484         return 0;
 485 }
 486
 487 void
 488 bpress(XEvent *e)
 489 {
 490         int btn = e->xbutton.button;
 491         struct timespec now;
 492         int snap;
 493
 494         if (1 <= btn && btn <= 11)
 495                 buttons |= 1 << (btn-1);
 496
 497         if (IS_SET(MODE_MOUSE) && !(e->xbutton.state & forcemousemod)) {
 498                 mousereport(e);
 499                 return;
 500         }
 501
 502         if (mouseaction(e, 0))
 503                 return;
 504
 505         if (btn == Button1) {
 506                 /*
 507                  * If the user clicks below predefined timeouts specific
 508                  * snapping behaviour is exposed.
 509                  */
 510                 clock_gettime(CLOCK_MONOTONIC, &now);
 511                 if (TIMEDIFF(now, xsel.tclick2) <= tripleclicktimeout) {
 512                         snap = SNAP_LINE;
 513                 } else if (TIMEDIFF(now, xsel.tclick1) <= doubleclicktimeout) {
 514                         snap = SNAP_WORD;
 515                 } else {
 516                         snap = 0;
 517                 }
 518                 xsel.tclick2 = xsel.tclick1;
 519                 xsel.tclick1 = now;
 520
 521                 selstart(evcol(e), evrow(e), snap);
 522         }
 523 }
 524
 525 void
 526 propnotify(XEvent *e)
 527 {
 528         XPropertyEvent *xpev;
 529         Atom clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
 530
 531         xpev = &e->xproperty;
 532         if (xpev->state == PropertyNewValue &&
 533                         (xpev->atom == XA_PRIMARY ||
 534                          xpev->atom == clipboard)) {
 535                 selnotify(e);
 536         }
 537 }
 538
 539 void
 540 selnotify(XEvent *e)
 541 {
 542         ulong nitems, ofs, rem;
 543         int format;
 544         uchar *data, *last, *repl;
 545         Atom type, incratom, property = None;
 546
 547         incratom = XInternAtom(xw.dpy, "INCR", 0);
 548
 549         ofs = 0;
 550         if (e->type == SelectionNotify)
 551                 property = e->xselection.property;
 552         else if (e->type == PropertyNotify)
 553                 property = e->xproperty.atom;
 554
 555         if (property == None)
 556                 return;
 557
 558         do {
 559                 if (XGetWindowProperty(xw.dpy, xw.win, property, ofs,
 560                                         BUFSIZ/4, False, AnyPropertyType,
 561                                         &type, &format, &nitems, &rem,
 562                                         &data)) {
 563                         fprintf(stderr, "Clipboard allocation failed\n");
 564                         return;
 565                 }
 566
 567                 if (e->type == PropertyNotify && nitems == 0 && rem == 0) {
 568                         /*
 569                          * If there is some PropertyNotify with no data, then
 570                          * this is the signal of the selection owner that all
 571                          * data has been transferred. We won't need to receive
 572                          * PropertyNotify events anymore.
 573                          */
 574                         MODBIT(xw.attrs.event_mask, 0, PropertyChangeMask);
 575                         XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask,
 576                                         &xw.attrs);
 577                 }
 578
 579                 if (type == incratom) {
 580                         /*
 581                          * Activate the PropertyNotify events so we receive
 582                          * when the selection owner does send us the next
 583                          * chunk of data.
 584                          */
 585                         MODBIT(xw.attrs.event_mask, 1, PropertyChangeMask);
 586                         XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask,
 587                                         &xw.attrs);
 588
 589                         /*
 590                          * Deleting the property is the transfer start signal.
 591                          */
 592                         XDeleteProperty(xw.dpy, xw.win, (int)property);
 593                         continue;
 594                 }
 595
 596                 /*
 597                  * As seen in getsel:
 598                  * Line endings are inconsistent in the terminal and GUI world
 599                  * copy and pasting. When receiving some selection data,
 600                  * replace all '\n' with '\r'.
 601                  * FIXME: Fix the computer world.
 602                  */
 603                 repl = data;
 604                 last = data + nitems * format / 8;
 605                 while ((repl = memchr(repl, '\n', last - repl))) {
 606                         *repl++ = '\r';
 607                 }
 608
 609                 if (IS_SET(MODE_BRCKTPASTE) && ofs == 0)
 610                         ttywrite("\033[200~", 6, 0);
 611                 ttywrite((char *)data, nitems * format / 8, 1);
 612                 if (IS_SET(MODE_BRCKTPASTE) && rem == 0)
 613                         ttywrite("\033[201~", 6, 0);
 614                 XFree(data);
 615                 /* number of 32-bit chunks returned */
 616                 ofs += nitems * format / 32;
 617         } while (rem > 0);
 618
 619         /*
 620          * Deleting the property again tells the selection owner to send the
 621          * next data chunk in the property.
 622          */
 623         XDeleteProperty(xw.dpy, xw.win, (int)property);
 624 }
 625
 626 void
 627 xclipcopy(void)
 628 {
 629         clipcopy(NULL);
 630 }
 631
 632 void
 633 selclear_(XEvent *e)
 634 {
 635         selclear();
 636 }
 637
 638 void
 639 selrequest(XEvent *e)
 640 {
 641         XSelectionRequestEvent *xsre;
 642         XSelectionEvent xev;
 643         Atom xa_targets, string, clipboard;
 644         char *seltext;
 645
 646         xsre = (XSelectionRequestEvent *) e;
 647         xev.type = SelectionNotify;
 648         xev.requestor = xsre->requestor;
 649         xev.selection = xsre->selection;
 650         xev.target = xsre->target;
 651         xev.time = xsre->time;
 652         if (xsre->property == None)
 653                 xsre->property = xsre->target;
 654
 655         /* reject */
 656         xev.property = None;
 657
 658         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
 659         if (xsre->target == xa_targets) {
 660                 /* respond with the supported type */
 661                 string = xsel.xtarget;
 662                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
 663                                 XA_ATOM, 32, PropModeReplace,
 664                                 (uchar *) &string, 1);
 665                 xev.property = xsre->property;
 666         } else if (xsre->target == xsel.xtarget || xsre->target == XA_STRING) {
 667                 /*
 668                  * xith XA_STRING non ascii characters may be incorrect in the
 669                  * requestor. It is not our problem, use utf8.
 670                  */
 671                 clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
 672                 if (xsre->selection == XA_PRIMARY) {
 673                         seltext = xsel.primary;
 674                 } else if (xsre->selection == clipboard) {
 675                         seltext = xsel.clipboard;
 676                 } else {
 677                         fprintf(stderr,
 678                                 "Unhandled clipboard selection 0x%lx\n",
 679                                 xsre->selection);
 680                         return;
 681                 }
 682                 if (seltext != NULL) {
 683                         XChangeProperty(xsre->display, xsre->requestor,
 684                                         xsre->property, xsre->target,
 685                                         8, PropModeReplace,
 686                                         (uchar *)seltext, strlen(seltext));
 687                         xev.property = xsre->property;
 688                 }
 689         }
 690
 691         /* all done, send a notification to the listener */
 692         if (!XSendEvent(xsre->display, xsre->requestor, 1, 0, (XEvent *) &xev))
 693                 fprintf(stderr, "Error sending SelectionNotify event\n");
 694 }
 695
 696 void
 697 setsel(char *str, Time t)
 698 {
 699         if (!str)
 700                 return;
 701
 702         free(xsel.primary);
 703         xsel.primary = str;
 704
 705         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, t);
 706         if (XGetSelectionOwner(xw.dpy, XA_PRIMARY) != xw.win)
 707                 selclear();
 708 }
 709
 710 void
 711 xsetsel(char *str)
 712 {
 713         setsel(str, CurrentTime);
 714 }
 715
 716 void
 717 brelease(XEvent *e)
 718 {
 719         int btn = e->xbutton.button;
 720
 721         if (1 <= btn && btn <= 11)
 722                 buttons &= ~(1 << (btn-1));
 723
 724         if (IS_SET(MODE_MOUSE) && !(e->xbutton.state & forcemousemod)) {
 725                 mousereport(e);
 726                 return;
 727         }
 728
 729         if (mouseaction(e, 1))
 730                 return;
 731         if (btn == Button1)
 732                 mousesel(e, 1);
 733 }
 734
 735 void
 736 bmotion(XEvent *e)
 737 {
 738         if (IS_SET(MODE_MOUSE) && !(e->xbutton.state & forcemousemod)) {
 739                 mousereport(e);
 740                 return;
 741         }
 742
 743         mousesel(e, 0);
 744 }
 745
 746 void
 747 cresize(int width, int height)
 748 {
 749         int col, row;
 750
 751         if (width != 0)
 752                 win.w = width;
 753         if (height != 0)
 754                 win.h = height;
 755
 756         col = (win.w - 2 * borderpx) / win.cw;
 757         row = (win.h - 2 * borderpx) / win.ch;
 758         col = MAX(1, col);
 759         row = MAX(1, row);
 760
 761         win.hborderpx = (win.w - col * win.cw) / 2;
 762         win.vborderpx = (win.h - row * win.ch) / 2;
 763
 764         tresize(col, row);
 765         xresize(col, row);
 766         ttyresize(win.tw, win.th);
 767 }
 768
 769 void
 770 xresize(int col, int row)
 771 {
 772         win.tw = col * win.cw;
 773         win.th = row * win.ch;
 774
 775         XFreePixmap(xw.dpy, xw.buf);
 776         xw.buf = XCreatePixmap(xw.dpy, xw.win, win.w, win.h,
 777                         xw.depth);
 778         XftDrawChange(xw.draw, xw.buf);
 779         xclear(0, 0, win.w, win.h);
 780
 781         /* resize to new width */
 782         xw.specbuf = xrealloc(xw.specbuf, col * sizeof(GlyphFontSpec));
 783 }
 784
 785 ushort
 786 sixd_to_16bit(int x)
 787 {
 788         return x == 0 ? 0 : 0x3737 + 0x2828 * x;
 789 }
 790
 791 int
 792 xloadcolor(int i, const char *name, Color *ncolor)
 793 {
 794         XRenderColor color = { .alpha = 0xffff };
 795
 796         if (!name) {
 797                 if (BETWEEN(i, 16, 255)) { /* 256 color */
 798                         if (i < 6*6*6+16) { /* same colors as xterm */
 799                                 color.red   = sixd_to_16bit( ((i-16)/36)%6 );
 800                                 color.green = sixd_to_16bit( ((i-16)/6) %6 );
 801                                 color.blue  = sixd_to_16bit( ((i-16)/1) %6 );
 802                         } else { /* greyscale */
 803                                 color.red = 0x0808 + 0x0a0a * (i - (6*6*6+16));
 804                                 color.green = color.blue = color.red;
 805                         }
 806                         return XftColorAllocValue(xw.dpy, xw.vis,
 807                                                   xw.cmap, &color, ncolor);
 808                 } else
 809                         name = colorname[i];
 810         }
 811
 812         return XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, ncolor);
 813 }
 814
 815 void
 816 xloadcols(void)
 817 {
 818         int i;
 819         static int loaded;
 820         Color *cp;
 821
 822         if (loaded) {
 823                 for (cp = dc.col; cp < &dc.col[dc.collen]; ++cp)
 824                         XftColorFree(xw.dpy, xw.vis, xw.cmap, cp);
 825         } else {
 826                 dc.collen = MAX(LEN(colorname), 256);
 827                 dc.col = xmalloc(dc.collen * sizeof(Color));
 828         }
 829
 830         for (i = 0; i < dc.collen; i++)
 831                 if (!xloadcolor(i, NULL, &dc.col[i])) {
 832                         if (colorname[i])
 833                                 die("could not allocate color '%s'\n", colorname[i]);
 834                         else
 835                                 die("could not allocate color %d\n", i);
 836                 }
 837
 838         /* set alpha value of bg color */
 839         if (opt_alpha)
 840                 alpha = strtof(opt_alpha, NULL);
 841         dc.col[defaultbg].color.alpha = (unsigned short)(0xffff * alpha);
 842         dc.col[defaultbg].pixel &= 0x00FFFFFF;
 843         dc.col[defaultbg].pixel |= (unsigned char)(0xff * alpha) << 24;
 844         loaded = 1;
 845 }
 846
 847 int
 848 xgetcolor(int x, unsigned char *r, unsigned char *g, unsigned char *b)
 849 {
 850         if (!BETWEEN(x, 0, dc.collen))
 851                 return 1;
 852
 853         *r = dc.col[x].color.red >> 8;
 854         *g = dc.col[x].color.green >> 8;
 855         *b = dc.col[x].color.blue >> 8;
 856
 857         return 0;
 858 }
 859
 860 int
 861 xsetcolorname(int x, const char *name)
 862 {
 863         Color ncolor;
 864
 865         if (!BETWEEN(x, 0, dc.collen))
 866                 return 1;
 867
 868         if (!xloadcolor(x, name, &ncolor))
 869                 return 1;
 870
 871         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
 872         dc.col[x] = ncolor;
 873
 874         return 0;
 875 }
 876
 877 /*
 878  * Absolute coordinates.
 879  */
 880 void
 881 xclear(int x1, int y1, int x2, int y2)
 882 {
 883         XftDrawRect(xw.draw,
 884                         &dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
 885                         x1, y1, x2-x1, y2-y1);
 886 }
 887
 888 void
 889 xhints(void)
 890 {
 891         XClassHint class = {opt_name ? opt_name : "st",
 892                             opt_class ? opt_class : "St"};
 893         XWMHints wm = {.flags = InputHint, .input = 1};
 894         XSizeHints *sizeh;
 895
 896         sizeh = XAllocSizeHints();
 897
 898         sizeh->flags = PSize | PResizeInc | PBaseSize | PMinSize;
 899         sizeh->height = win.h;
 900         sizeh->width = win.w;
 901         sizeh->height_inc = 1;
 902         sizeh->width_inc = 1;
 903         sizeh->base_height = 2 * borderpx;
 904         sizeh->base_width = 2 * borderpx;
 905         sizeh->min_height = win.ch + 2 * borderpx;
 906         sizeh->min_width = win.cw + 2 * borderpx;
 907         if (xw.isfixed) {
 908                 sizeh->flags |= PMaxSize;
 909                 sizeh->min_width = sizeh->max_width = win.w;
 910                 sizeh->min_height = sizeh->max_height = win.h;
 911         }
 912         if (xw.gm & (XValue|YValue)) {
 913                 sizeh->flags |= USPosition | PWinGravity;
 914                 sizeh->x = xw.l;
 915                 sizeh->y = xw.t;
 916                 sizeh->win_gravity = xgeommasktogravity(xw.gm);
 917         }
 918
 919         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm,
 920                         &class);
 921         XFree(sizeh);
 922 }
 923
 924 int
 925 xgeommasktogravity(int mask)
 926 {
 927         switch (mask & (XNegative|YNegative)) {
 928         case 0:
 929                 return NorthWestGravity;
 930         case XNegative:
 931                 return NorthEastGravity;
 932         case YNegative:
 933                 return SouthWestGravity;
 934         }
 935
 936         return SouthEastGravity;
 937 }
 938
 939 int
 940 xloadfont(Font *f, FcPattern *pattern)
 941 {
 942         FcPattern *configured;
 943         FcPattern *match;
 944         FcResult result;
 945         XGlyphInfo extents;
 946         int wantattr, haveattr;
 947
 948         /*
 949          * Manually configure instead of calling XftMatchFont
 950          * so that we can use the configured pattern for
 951          * "missing glyph" lookups.
 952          */
 953         configured = FcPatternDuplicate(pattern);
 954         if (!configured)
 955                 return 1;
 956
 957         FcConfigSubstitute(NULL, configured, FcMatchPattern);
 958         XftDefaultSubstitute(xw.dpy, xw.scr, configured);
 959
 960         match = FcFontMatch(NULL, configured, &result);
 961         if (!match) {
 962                 FcPatternDestroy(configured);
 963                 return 1;
 964         }
 965
 966         if (!(f->match = XftFontOpenPattern(xw.dpy, match))) {
 967                 FcPatternDestroy(configured);
 968                 FcPatternDestroy(match);
 969                 return 1;
 970         }
 971
 972         if ((XftPatternGetInteger(pattern, "slant", 0, &wantattr) ==
 973             XftResultMatch)) {
 974                 /*
 975                  * Check if xft was unable to find a font with the appropriate
 976                  * slant but gave us one anyway. Try to mitigate.
 977                  */
 978                 if ((XftPatternGetInteger(f->match->pattern, "slant", 0,
 979                     &haveattr) != XftResultMatch) || haveattr < wantattr) {
 980                         f->badslant = 1;
 981                         fputs("font slant does not match\n", stderr);
 982                 }
 983         }
 984
 985         if ((XftPatternGetInteger(pattern, "weight", 0, &wantattr) ==
 986             XftResultMatch)) {
 987                 if ((XftPatternGetInteger(f->match->pattern, "weight", 0,
 988                     &haveattr) != XftResultMatch) || haveattr != wantattr) {
 989                         f->badweight = 1;
 990                         fputs("font weight does not match\n", stderr);
 991                 }
 992         }
 993
 994         XftTextExtentsUtf8(xw.dpy, f->match,
 995                 (const FcChar8 *) ascii_printable,
 996                 strlen(ascii_printable), &extents);
 997
 998         f->set = NULL;
 999         f->pattern = configured;
1000
1001         f->ascent = f->match->ascent;
1002         f->descent = f->match->descent;
1003         f->lbearing = 0;
1004         f->rbearing = f->match->max_advance_width;
1005
1006         f->height = f->ascent + f->descent;
1007         f->width = DIVCEIL(extents.xOff, strlen(ascii_printable));
1008
1009         return 0;
1010 }
1011
1012 void
1013 xloadfonts(const char *fontstr, double fontsize)
1014 {
1015         FcPattern *pattern;
1016         double fontval;
1017
1018         if (fontstr[0] == '-')
1019                 pattern = XftXlfdParse(fontstr, False, False);
1020         else
1021                 pattern = FcNameParse((const FcChar8 *)fontstr);
1022
1023         if (!pattern)
1024                 die("can't open font %s\n", fontstr);
1025
1026         if (fontsize > 1) {
1027                 FcPatternDel(pattern, FC_PIXEL_SIZE);
1028                 FcPatternDel(pattern, FC_SIZE);
1029                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
1030                 usedfontsize = fontsize;
1031         } else {
1032                 if (FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval) ==
1033                                 FcResultMatch) {
1034                         usedfontsize = fontval;
1035                 } else if (FcPatternGetDouble(pattern, FC_SIZE, 0, &fontval) ==
1036                                 FcResultMatch) {
1037                         usedfontsize = -1;
1038                 } else {
1039                         /*
1040                          * Default font size is 12, if none given. This is to
1041                          * have a known usedfontsize value.
1042                          */
1043                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
1044                         usedfontsize = 12;
1045                 }
1046                 defaultfontsize = usedfontsize;
1047         }
1048
1049         if (xloadfont(&dc.font, pattern))
1050                 die("can't open font %s\n", fontstr);
1051
1052         if (usedfontsize < 0) {
1053                 FcPatternGetDouble(dc.font.match->pattern,
1054                                    FC_PIXEL_SIZE, 0, &fontval);
1055                 usedfontsize = fontval;
1056                 if (fontsize == 0)
1057                         defaultfontsize = fontval;
1058         }
1059
1060         /* Setting character width and height. */
1061         win.cw = ceilf(dc.font.width * cwscale);
1062         win.ch = ceilf(dc.font.height * chscale);
1063
1064         FcPatternDel(pattern, FC_SLANT);
1065         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
1066         if (xloadfont(&dc.ifont, pattern))
1067                 die("can't open font %s\n", fontstr);
1068
1069         FcPatternDel(pattern, FC_WEIGHT);
1070         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
1071         if (xloadfont(&dc.ibfont, pattern))
1072                 die("can't open font %s\n", fontstr);
1073
1074         FcPatternDel(pattern, FC_SLANT);
1075         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
1076         if (xloadfont(&dc.bfont, pattern))
1077                 die("can't open font %s\n", fontstr);
1078
1079         FcPatternDestroy(pattern);
1080 }
1081
1082 void
1083 xunloadfont(Font *f)
1084 {
1085         XftFontClose(xw.dpy, f->match);
1086         FcPatternDestroy(f->pattern);
1087         if (f->set)
1088                 FcFontSetDestroy(f->set);
1089 }
1090
1091 void
1092 xunloadfonts(void)
1093 {
1094         /* Free the loaded fonts in the font cache.  */
1095         while (frclen > 0)
1096                 XftFontClose(xw.dpy, frc[--frclen].font);
1097
1098         xunloadfont(&dc.font);
1099         xunloadfont(&dc.bfont);
1100         xunloadfont(&dc.ifont);
1101         xunloadfont(&dc.ibfont);
1102 }
1103
1104 int
1105 ximopen(Display *dpy)
1106 {
1107         XIMCallback imdestroy = { .client_data = NULL, .callback = ximdestroy };
1108         XICCallback icdestroy = { .client_data = NULL, .callback = xicdestroy };
1109
1110         xw.ime.xim = XOpenIM(xw.dpy, NULL, NULL, NULL);
1111         if (xw.ime.xim == NULL)
1112                 return 0;
1113
1114         if (XSetIMValues(xw.ime.xim, XNDestroyCallback, &imdestroy, NULL))
1115                 fprintf(stderr, "XSetIMValues: "
1116                                 "Could not set XNDestroyCallback.\n");
1117
1118         xw.ime.spotlist = XVaCreateNestedList(0, XNSpotLocation, &xw.ime.spot,
1119                                               NULL);
1120
1121         if (xw.ime.xic == NULL) {
1122                 xw.ime.xic = XCreateIC(xw.ime.xim, XNInputStyle,
1123                                        XIMPreeditNothing | XIMStatusNothing,
1124                                        XNClientWindow, xw.win,
1125                                        XNDestroyCallback, &icdestroy,
1126                                        NULL);
1127         }
1128         if (xw.ime.xic == NULL)
1129                 fprintf(stderr, "XCreateIC: Could not create input context.\n");
1130
1131         return 1;
1132 }
1133
1134 void
1135 ximinstantiate(Display *dpy, XPointer client, XPointer call)
1136 {
1137         if (ximopen(dpy))
1138                 XUnregisterIMInstantiateCallback(xw.dpy, NULL, NULL, NULL,
1139                                                  ximinstantiate, NULL);
1140 }
1141
1142 void
1143 ximdestroy(XIM xim, XPointer client, XPointer call)
1144 {
1145         xw.ime.xim = NULL;
1146         XRegisterIMInstantiateCallback(xw.dpy, NULL, NULL, NULL,
1147                                        ximinstantiate, NULL);
1148         XFree(xw.ime.spotlist);
1149 }
1150
1151 int
1152 xicdestroy(XIC xim, XPointer client, XPointer call)
1153 {
1154         xw.ime.xic = NULL;
1155         return 1;
1156 }
1157
1158 void
1159 xinit(int cols, int rows)
1160 {
1161         XGCValues gcvalues;
1162         Cursor cursor;
1163         Window parent;
1164         pid_t thispid = getpid();
1165         XColor xmousefg, xmousebg;
1166         XWindowAttributes attr;
1167         XVisualInfo vis;
1168
1169         xw.scr = XDefaultScreen(xw.dpy);
1170
1171         if (!(opt_embed && (parent = strtol(opt_embed, NULL, 0)))) {
1172                 parent = XRootWindow(xw.dpy, xw.scr);
1173                 xw.depth = 32;
1174         } else {
1175                 XGetWindowAttributes(xw.dpy, parent, &attr);
1176                 xw.depth = attr.depth;
1177         }
1178
1179         XMatchVisualInfo(xw.dpy, xw.scr, xw.depth, TrueColor, &vis);
1180         xw.vis = vis.visual;
1181
1182         /* font */
1183         if (!FcInit())
1184                 die("could not init fontconfig.\n");
1185
1186         usedfont = (opt_font == NULL)? font : opt_font;
1187         xloadfonts(usedfont, 0);
1188
1189         /* colors */
1190         xw.cmap = XCreateColormap(xw.dpy, parent, xw.vis, None);
1191         xloadcols();
1192
1193         /* adjust fixed window geometry */
1194         win.w = 2 * win.hborderpx + 2 * borderpx + cols * win.cw;
1195         win.h = 2 * win.vborderpx + 2 * borderpx + rows * win.ch;
1196         if (xw.gm & XNegative)
1197                 xw.l += DisplayWidth(xw.dpy, xw.scr) - win.w - 2;
1198         if (xw.gm & YNegative)
1199                 xw.t += DisplayHeight(xw.dpy, xw.scr) - win.h - 2;
1200
1201         /* Events */
1202         xw.attrs.background_pixel = dc.col[defaultbg].pixel;
1203         xw.attrs.border_pixel = dc.col[defaultbg].pixel;
1204         xw.attrs.bit_gravity = NorthWestGravity;
1205         xw.attrs.event_mask = FocusChangeMask | KeyPressMask | KeyReleaseMask
1206                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
1207                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
1208         xw.attrs.colormap = xw.cmap;
1209
1210         xw.win = XCreateWindow(xw.dpy, parent, xw.l, xw.t,
1211                         win.w, win.h, 0, xw.depth, InputOutput,
1212                         xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity
1213                         | CWEventMask | CWColormap, &xw.attrs);
1214
1215         memset(&gcvalues, 0, sizeof(gcvalues));
1216         gcvalues.graphics_exposures = False;
1217         xw.buf = XCreatePixmap(xw.dpy, xw.win, win.w, win.h, xw.depth);
1218         dc.gc = XCreateGC(xw.dpy, xw.buf, GCGraphicsExposures, &gcvalues);
1219         XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
1220         XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, win.w, win.h);
1221
1222         /* font spec buffer */
1223         xw.specbuf = xmalloc(cols * sizeof(GlyphFontSpec));
1224
1225         /* Xft rendering context */
1226         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
1227
1228         /* input methods */
1229         if (!ximopen(xw.dpy)) {
1230                 XRegisterIMInstantiateCallback(xw.dpy, NULL, NULL, NULL,
1231                                                ximinstantiate, NULL);
1232         }
1233
1234         /* white cursor, black outline */
1235         cursor = XCreateFontCursor(xw.dpy, mouseshape);
1236         XDefineCursor(xw.dpy, xw.win, cursor);
1237
1238         if (XParseColor(xw.dpy, xw.cmap, colorname[mousefg], &xmousefg) == 0) {
1239                 xmousefg.red   = 0xffff;
1240                 xmousefg.green = 0xffff;
1241                 xmousefg.blue  = 0xffff;
1242         }
1243
1244         if (XParseColor(xw.dpy, xw.cmap, colorname[mousebg], &xmousebg) == 0) {
1245                 xmousebg.red   = 0x0000;
1246                 xmousebg.green = 0x0000;
1247                 xmousebg.blue  = 0x0000;
1248         }
1249
1250         XRecolorCursor(xw.dpy, cursor, &xmousefg, &xmousebg);
1251
1252         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
1253         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
1254         xw.netwmname = XInternAtom(xw.dpy, "_NET_WM_NAME", False);
1255         xw.netwmiconname = XInternAtom(xw.dpy, "_NET_WM_ICON_NAME", False);
1256         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
1257
1258         xw.netwmpid = XInternAtom(xw.dpy, "_NET_WM_PID", False);
1259         XChangeProperty(xw.dpy, xw.win, xw.netwmpid, XA_CARDINAL, 32,
1260                         PropModeReplace, (uchar *)&thispid, 1);
1261
1262         win.mode = MODE_NUMLOCK;
1263         resettitle();
1264         xhints();
1265         XMapWindow(xw.dpy, xw.win);
1266         XSync(xw.dpy, False);
1267
1268         clock_gettime(CLOCK_MONOTONIC, &xsel.tclick1);
1269         clock_gettime(CLOCK_MONOTONIC, &xsel.tclick2);
1270         xsel.primary = NULL;
1271         xsel.clipboard = NULL;
1272         xsel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
1273         if (xsel.xtarget == None)
1274                 xsel.xtarget = XA_STRING;
1275 }
1276
1277 int
1278 xmakeglyphfontspecs(XftGlyphFontSpec *specs, const Glyph *glyphs, int len, int x, int y)
1279 {
1280         float winx = win.hborderpx + x * win.cw, winy = win.vborderpx + y * win.ch, xp, yp;
1281         ushort mode, prevmode = USHRT_MAX;
1282         Font *font = &dc.font;
1283         int frcflags = FRC_NORMAL;
1284         float runewidth = win.cw;
1285         Rune rune;
1286         FT_UInt glyphidx;
1287         FcResult fcres;
1288         FcPattern *fcpattern, *fontpattern;
1289         FcFontSet *fcsets[] = { NULL };
1290         FcCharSet *fccharset;
1291         int i, f, numspecs = 0;
1292
1293         for (i = 0, xp = winx, yp = winy + font->ascent; i < len; ++i) {
1294                 /* Fetch rune and mode for current glyph. */
1295                 rune = glyphs[i].u;
1296                 mode = glyphs[i].mode;
1297
1298                 /* Skip dummy wide-character spacing. */
1299                 if (mode == ATTR_WDUMMY)
1300                         continue;
1301
1302                 /* Determine font for glyph if different from previous glyph. */
1303                 if (prevmode != mode) {
1304                         prevmode = mode;
1305                         font = &dc.font;
1306                         frcflags = FRC_NORMAL;
1307                         runewidth = win.cw * ((mode & ATTR_WIDE) ? 2.0f : 1.0f);
1308                         if ((mode & ATTR_ITALIC) && (mode & ATTR_BOLD)) {
1309                                 font = &dc.ibfont;
1310                                 frcflags = FRC_ITALICBOLD;
1311                         } else if (mode & ATTR_ITALIC) {
1312                                 font = &dc.ifont;
1313                                 frcflags = FRC_ITALIC;
1314                         } else if (mode & ATTR_BOLD) {
1315                                 font = &dc.bfont;
1316                                 frcflags = FRC_BOLD;
1317                         }
1318                         yp = winy + font->ascent;
1319                 }
1320
1321                 /* Lookup character index with default font. */
1322                 glyphidx = XftCharIndex(xw.dpy, font->match, rune);
1323                 if (glyphidx) {
1324                         specs[numspecs].font = font->match;
1325                         specs[numspecs].glyph = glyphidx;
1326                         specs[numspecs].x = (short)xp;
1327                         specs[numspecs].y = (short)yp;
1328                         xp += runewidth;
1329                         numspecs++;
1330                         continue;
1331                 }
1332
1333                 /* Fallback on font cache, search the font cache for match. */
1334                 for (f = 0; f < frclen; f++) {
1335                         glyphidx = XftCharIndex(xw.dpy, frc[f].font, rune);
1336                         /* Everything correct. */
1337                         if (glyphidx && frc[f].flags == frcflags)
1338                                 break;
1339                         /* We got a default font for a not found glyph. */
1340                         if (!glyphidx && frc[f].flags == frcflags
1341                                         && frc[f].unicodep == rune) {
1342                                 break;
1343                         }
1344                 }
1345
1346                 /* Nothing was found. Use fontconfig to find matching font. */
1347                 if (f >= frclen) {
1348                         if (!font->set)
1349                                 font->set = FcFontSort(0, font->pattern,
1350                                                        1, 0, &fcres);
1351                         fcsets[0] = font->set;
1352
1353                         /*
1354                          * Nothing was found in the cache. Now use
1355                          * some dozen of Fontconfig calls to get the
1356                          * font for one single character.
1357                          *
1358                          * Xft and fontconfig are design failures.
1359                          */
1360                         fcpattern = FcPatternDuplicate(font->pattern);
1361                         fccharset = FcCharSetCreate();
1362
1363                         FcCharSetAddChar(fccharset, rune);
1364                         FcPatternAddCharSet(fcpattern, FC_CHARSET,
1365                                         fccharset);
1366                         FcPatternAddBool(fcpattern, FC_SCALABLE, 1);
1367
1368                         FcConfigSubstitute(0, fcpattern,
1369                                         FcMatchPattern);
1370                         FcDefaultSubstitute(fcpattern);
1371
1372                         fontpattern = FcFontSetMatch(0, fcsets, 1,
1373                                         fcpattern, &fcres);
1374
1375                         /* Allocate memory for the new cache entry. */
1376                         if (frclen >= frccap) {
1377                                 frccap += 16;
1378                                 frc = xrealloc(frc, frccap * sizeof(Fontcache));
1379                         }
1380
1381                         frc[frclen].font = XftFontOpenPattern(xw.dpy,
1382                                         fontpattern);
1383                         if (!frc[frclen].font)
1384                                 die("XftFontOpenPattern failed seeking fallback font: %s\n",
1385                                         strerror(errno));
1386                         frc[frclen].flags = frcflags;
1387                         frc[frclen].unicodep = rune;
1388
1389                         glyphidx = XftCharIndex(xw.dpy, frc[frclen].font, rune);
1390
1391                         f = frclen;
1392                         frclen++;
1393
1394                         FcPatternDestroy(fcpattern);
1395                         FcCharSetDestroy(fccharset);
1396                 }
1397
1398                 specs[numspecs].font = frc[f].font;
1399                 specs[numspecs].glyph = glyphidx;
1400                 specs[numspecs].x = (short)xp;
1401                 specs[numspecs].y = (short)yp;
1402                 xp += runewidth;
1403                 numspecs++;
1404         }
1405
1406         return numspecs;
1407 }
1408
1409 void
1410 xdrawglyphfontspecs(const XftGlyphFontSpec *specs, Glyph base, int len, int x, int y)
1411 {
1412         int charlen = len * ((base.mode & ATTR_WIDE) ? 2 : 1);
1413         int winx = win.hborderpx + x * win.cw, winy = win.vborderpx + y * win.ch,
1414             width = charlen * win.cw;
1415         Color *fg, *bg, *temp, revfg, revbg, truefg, truebg;
1416         XRenderColor colfg, colbg;
1417         XRectangle r;
1418
1419         /* Fallback on color display for attributes not supported by the font */
1420         if (base.mode & ATTR_ITALIC && base.mode & ATTR_BOLD) {
1421                 if (dc.ibfont.badslant || dc.ibfont.badweight)
1422                         base.fg = defaultattr;
1423         } else if ((base.mode & ATTR_ITALIC && dc.ifont.badslant) ||
1424             (base.mode & ATTR_BOLD && dc.bfont.badweight)) {
1425                 base.fg = defaultattr;
1426         }
1427
1428         if (IS_TRUECOL(base.fg)) {
1429                 colfg.alpha = 0xffff;
1430                 colfg.red = TRUERED(base.fg);
1431                 colfg.green = TRUEGREEN(base.fg);
1432                 colfg.blue = TRUEBLUE(base.fg);
1433                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &truefg);
1434                 fg = &truefg;
1435         } else {
1436                 fg = &dc.col[base.fg];
1437         }
1438
1439         if (IS_TRUECOL(base.bg)) {
1440                 colbg.alpha = 0xffff;
1441                 colbg.green = TRUEGREEN(base.bg);
1442                 colbg.red = TRUERED(base.bg);
1443                 colbg.blue = TRUEBLUE(base.bg);
1444                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &truebg);
1445                 bg = &truebg;
1446         } else {
1447                 bg = &dc.col[base.bg];
1448         }
1449
1450         /* Change basic system colors [0-7] to bright system colors [8-15] */
1451         if ((base.mode & ATTR_BOLD_FAINT) == ATTR_BOLD && BETWEEN(base.fg, 0, 7))
1452                 fg = &dc.col[base.fg + 8];
1453
1454         if (IS_SET(MODE_REVERSE)) {
1455                 if (fg == &dc.col[defaultfg]) {
1456                         fg = &dc.col[defaultbg];
1457                 } else {
1458                         colfg.red = ~fg->color.red;
1459                         colfg.green = ~fg->color.green;
1460                         colfg.blue = ~fg->color.blue;
1461                         colfg.alpha = fg->color.alpha;
1462                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg,
1463                                         &revfg);
1464                         fg = &revfg;
1465                 }
1466
1467                 if (bg == &dc.col[defaultbg]) {
1468                         bg = &dc.col[defaultfg];
1469                 } else {
1470                         colbg.red = ~bg->color.red;
1471                         colbg.green = ~bg->color.green;
1472                         colbg.blue = ~bg->color.blue;
1473                         colbg.alpha = bg->color.alpha;
1474                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg,
1475                                         &revbg);
1476                         bg = &revbg;
1477                 }
1478         }
1479
1480         if ((base.mode & ATTR_BOLD_FAINT) == ATTR_FAINT) {
1481                 colfg.red = fg->color.red / 2;
1482                 colfg.green = fg->color.green / 2;
1483                 colfg.blue = fg->color.blue / 2;
1484                 colfg.alpha = fg->color.alpha;
1485                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &revfg);
1486                 fg = &revfg;
1487         }
1488
1489         if (base.mode & ATTR_REVERSE) {
1490                 temp = fg;
1491                 fg = bg;
1492                 bg = temp;
1493         }
1494
1495         if (base.mode & ATTR_BLINK && win.mode & MODE_BLINK)
1496                 fg = bg;
1497
1498         if (base.mode & ATTR_INVISIBLE)
1499                 fg = bg;
1500
1501         /* Intelligent cleaning up of the borders. */
1502         if (x == 0) {
1503                 xclear(0, (y == 0)? 0 : winy, win.vborderpx,
1504                         winy + win.ch +
1505                         ((winy + win.ch >= win.vborderpx + win.th)? win.h : 0));
1506         }
1507         if (winx + width >= win.hborderpx + win.tw) {
1508                 xclear(winx + width, (y == 0)? 0 : winy, win.w,
1509                         ((winy + win.ch >= win.vborderpx + win.th)? win.h : (winy + win.ch)));
1510         }
1511         if (y == 0)
1512                 xclear(winx, 0, winx + width, win.vborderpx);
1513         if (winy + win.ch >= win.vborderpx + win.th)
1514                 xclear(winx, winy + win.ch, winx + width, win.h);
1515
1516         /* Clean up the region we want to draw to. */
1517         XftDrawRect(xw.draw, bg, winx, winy, width, win.ch);
1518
1519         /* Set the clip region because Xft is sometimes dirty. */
1520         r.x = 0;
1521         r.y = 0;
1522         r.height = win.ch;
1523         r.width = width;
1524         XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
1525
1526         /* Render the glyphs. */
1527         XftDrawGlyphFontSpec(xw.draw, fg, specs, len);
1528
1529         /* Render underline and strikethrough. */
1530         if (base.mode & ATTR_UNDERLINE) {
1531                 XftDrawRect(xw.draw, fg, winx, winy + dc.font.ascent * chscale + 1,
1532                                 width, 1);
1533         }
1534
1535         if (base.mode & ATTR_STRUCK) {
1536                 XftDrawRect(xw.draw, fg, winx, winy + 2 * dc.font.ascent * chscale / 3,
1537                                 width, 1);
1538         }
1539
1540         /* Reset clip to none. */
1541         XftDrawSetClip(xw.draw, 0);
1542 }
1543
1544 void
1545 xdrawglyph(Glyph g, int x, int y)
1546 {
1547         int numspecs;
1548         XftGlyphFontSpec spec;
1549
1550         numspecs = xmakeglyphfontspecs(&spec, &g, 1, x, y);
1551         xdrawglyphfontspecs(&spec, g, numspecs, x, y);
1552 }
1553
1554 void
1555 xdrawcursor(int cx, int cy, Glyph g, int ox, int oy, Glyph og)
1556 {
1557         Color drawcol;
1558
1559         /* remove the old cursor */
1560         if (selected(ox, oy))
1561                 og.mode ^= ATTR_REVERSE;
1562         xdrawglyph(og, ox, oy);
1563
1564         if (IS_SET(MODE_HIDE))
1565                 return;
1566
1567         /*
1568          * Select the right color for the right mode.
1569          */
1570         g.mode &= ATTR_BOLD|ATTR_ITALIC|ATTR_UNDERLINE|ATTR_STRUCK|ATTR_WIDE;
1571
1572         if (IS_SET(MODE_REVERSE)) {
1573                 g.mode |= ATTR_REVERSE;
1574                 g.bg = defaultfg;
1575                 if (selected(cx, cy)) {
1576                         drawcol = dc.col[defaultcs];
1577                         g.fg = defaultrcs;
1578                 } else {
1579                         drawcol = dc.col[defaultrcs];
1580                         g.fg = defaultcs;
1581                 }
1582         } else {
1583                 if (selected(cx, cy)) {
1584                         g.fg = defaultfg;
1585                         g.bg = defaultrcs;
1586                 } else {
1587                         g.fg = defaultbg;
1588                         g.bg = defaultcs;
1589                 }
1590                 drawcol = dc.col[g.bg];
1591         }
1592
1593         /* draw the new one */
1594         if (IS_SET(MODE_FOCUSED)) {
1595                 switch (win.cursor) {
1596                 case 7: /* st extension */
1597                         g.u = 0x2603; /* snowman (U+2603) */
1598                         /* FALLTHROUGH */
1599                 case 0: /* Blinking Block */
1600                 case 1: /* Blinking Block (Default) */
1601                 case 2: /* Steady Block */
1602                         xdrawglyph(g, cx, cy);
1603                         break;
1604                 case 3: /* Blinking Underline */
1605                 case 4: /* Steady Underline */
1606                         XftDrawRect(xw.draw, &drawcol,
1607                                         win.hborderpx + cx * win.cw,
1608                                         win.vborderpx + (cy + 1) * win.ch - \
1609                                                 cursorthickness,
1610                                         win.cw, cursorthickness);
1611                         break;
1612                 case 5: /* Blinking bar */
1613                 case 6: /* Steady bar */
1614                         XftDrawRect(xw.draw, &drawcol,
1615                                         win.hborderpx + cx * win.cw,
1616                                         win.vborderpx + cy * win.ch,
1617                                         cursorthickness, win.ch);
1618                         break;
1619                 }
1620         } else {
1621                 XftDrawRect(xw.draw, &drawcol,
1622                                 win.hborderpx + cx * win.cw,
1623                                 win.vborderpx + cy * win.ch,
1624                                 win.cw - 1, 1);
1625                 XftDrawRect(xw.draw, &drawcol,
1626                                 win.hborderpx + cx * win.cw,
1627                                 win.vborderpx + cy * win.ch,
1628                                 1, win.ch - 1);
1629                 XftDrawRect(xw.draw, &drawcol,
1630                                 win.hborderpx + (cx + 1) * win.cw - 1,
1631                                 win.vborderpx + cy * win.ch,
1632                                 1, win.ch - 1);
1633                 XftDrawRect(xw.draw, &drawcol,
1634                                 win.hborderpx + cx * win.cw,
1635                                 win.vborderpx + (cy + 1) * win.ch - 1,
1636                                 win.cw, 1);
1637         }
1638 }
1639
1640 void
1641 xsetenv(void)
1642 {
1643         char buf[sizeof(long) * 8 + 1];
1644
1645         snprintf(buf, sizeof(buf), "%lu", xw.win);
1646         setenv("WINDOWID", buf, 1);
1647 }
1648
1649 void
1650 xseticontitle(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         XSetWMIconName(xw.dpy, xw.win, &prop);
1659         XSetTextProperty(xw.dpy, xw.win, &prop, xw.netwmiconname);
1660         XFree(prop.value);
1661 }
1662
1663 void
1664 xsettitle(char *p)
1665 {
1666         XTextProperty prop;
1667         DEFAULT(p, opt_title);
1668
1669         if (Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
1670                                         &prop) != Success)
1671                 return;
1672         XSetWMName(xw.dpy, xw.win, &prop);
1673         XSetTextProperty(xw.dpy, xw.win, &prop, xw.netwmname);
1674         XFree(prop.value);
1675 }
1676
1677 int
1678 xstartdraw(void)
1679 {
1680         return IS_SET(MODE_VISIBLE);
1681 }
1682
1683 void
1684 xdrawline(Line line, int x1, int y1, int x2)
1685 {
1686         int i, x, ox, numspecs;
1687         Glyph base, new;
1688         XftGlyphFontSpec *specs = xw.specbuf;
1689
1690         numspecs = xmakeglyphfontspecs(specs, &line[x1], x2 - x1, x1, y1);
1691         i = ox = 0;
1692         for (x = x1; x < x2 && i < numspecs; x++) {
1693                 new = line[x];
1694                 if (new.mode == ATTR_WDUMMY)
1695                         continue;
1696                 if (selected(x, y1))
1697                         new.mode ^= ATTR_REVERSE;
1698                 if (i > 0 && ATTRCMP(base, new)) {
1699                         xdrawglyphfontspecs(specs, base, i, ox, y1);
1700                         specs += i;
1701                         numspecs -= i;
1702                         i = 0;
1703                 }
1704                 if (i == 0) {
1705                         ox = x;
1706                         base = new;
1707                 }
1708                 i++;
1709         }
1710         if (i > 0)
1711                 xdrawglyphfontspecs(specs, base, i, ox, y1);
1712 }
1713
1714 void
1715 xfinishdraw(void)
1716 {
1717         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, win.w,
1718                         win.h, 0, 0);
1719         XSetForeground(xw.dpy, dc.gc,
1720                         dc.col[IS_SET(MODE_REVERSE)?
1721                                 defaultfg : defaultbg].pixel);
1722 }
1723
1724 void
1725 xximspot(int x, int y)
1726 {
1727         if (xw.ime.xic == NULL)
1728                 return;
1729
1730         xw.ime.spot.x = borderpx + x * win.cw;
1731         xw.ime.spot.y = borderpx + (y + 1) * win.ch;
1732
1733         XSetICValues(xw.ime.xic, XNPreeditAttributes, xw.ime.spotlist, NULL);
1734 }
1735
1736 void
1737 expose(XEvent *ev)
1738 {
1739         redraw();
1740 }
1741
1742 void
1743 visibility(XEvent *ev)
1744 {
1745         XVisibilityEvent *e = &ev->xvisibility;
1746
1747         MODBIT(win.mode, e->state != VisibilityFullyObscured, MODE_VISIBLE);
1748 }
1749
1750 void
1751 unmap(XEvent *ev)
1752 {
1753         win.mode &= ~MODE_VISIBLE;
1754 }
1755
1756 void
1757 xsetpointermotion(int set)
1758 {
1759         MODBIT(xw.attrs.event_mask, set, PointerMotionMask);
1760         XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask, &xw.attrs);
1761 }
1762
1763 void
1764 xsetmode(int set, unsigned int flags)
1765 {
1766         int mode = win.mode;
1767         MODBIT(win.mode, set, flags);
1768         if ((win.mode & MODE_REVERSE) != (mode & MODE_REVERSE))
1769                 redraw();
1770 }
1771
1772 int
1773 xsetcursor(int cursor)
1774 {
1775         if (!BETWEEN(cursor, 0, 7)) /* 7: st extension */
1776                 return 1;
1777         win.cursor = cursor;
1778         return 0;
1779 }
1780
1781 void
1782 xseturgency(int add)
1783 {
1784         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
1785
1786         MODBIT(h->flags, add, XUrgencyHint);
1787         XSetWMHints(xw.dpy, xw.win, h);
1788         XFree(h);
1789 }
1790
1791 void
1792 xbell(void)
1793 {
1794         if (!(IS_SET(MODE_FOCUSED)))
1795                 xseturgency(1);
1796         if (bellvolume)
1797                 XkbBell(xw.dpy, xw.win, bellvolume, (Atom)NULL);
1798 }
1799
1800 void
1801 focus(XEvent *ev)
1802 {
1803         XFocusChangeEvent *e = &ev->xfocus;
1804
1805         if (e->mode == NotifyGrab)
1806                 return;
1807
1808         if (ev->type == FocusIn) {
1809                 if (xw.ime.xic)
1810                         XSetICFocus(xw.ime.xic);
1811                 win.mode |= MODE_FOCUSED;
1812                 xseturgency(0);
1813                 if (IS_SET(MODE_FOCUS))
1814                         ttywrite("\033[I", 3, 0);
1815         } else {
1816                 if (xw.ime.xic)
1817                         XUnsetICFocus(xw.ime.xic);
1818                 win.mode &= ~MODE_FOCUSED;
1819                 if (IS_SET(MODE_FOCUS))
1820                         ttywrite("\033[O", 3, 0);
1821         }
1822 }
1823
1824 int
1825 match(uint mask, uint state)
1826 {
1827         return mask == XK_ANY_MOD || mask == (state & ~ignoremod);
1828 }
1829
1830 char*
1831 kmap(KeySym k, uint state)
1832 {
1833         Key *kp;
1834         int i;
1835
1836         /* Check for mapped keys out of X11 function keys. */
1837         for (i = 0; i < LEN(mappedkeys); i++) {
1838                 if (mappedkeys[i] == k)
1839                         break;
1840         }
1841         if (i == LEN(mappedkeys)) {
1842                 if ((k & 0xFFFF) < 0xFD00)
1843                         return NULL;
1844         }
1845
1846         for (kp = key; kp < key + LEN(key); kp++) {
1847                 if (kp->k != k)
1848                         continue;
1849
1850                 if (!match(kp->mask, state))
1851                         continue;
1852
1853                 if (IS_SET(MODE_APPKEYPAD) ? kp->appkey < 0 : kp->appkey > 0)
1854                         continue;
1855                 if (IS_SET(MODE_NUMLOCK) && kp->appkey == 2)
1856                         continue;
1857
1858                 if (IS_SET(MODE_APPCURSOR) ? kp->appcursor < 0 : kp->appcursor > 0)
1859                         continue;
1860
1861                 return kp->s;
1862         }
1863
1864         return NULL;
1865 }
1866
1867 void
1868 kpress(XEvent *ev)
1869 {
1870         XKeyEvent *e = &ev->xkey;
1871         KeySym ksym;
1872         char buf[64], *customkey;
1873         int len;
1874         Rune c;
1875         Status status;
1876         Shortcut *bp;
1877
1878         if (IS_SET(MODE_KBDLOCK))
1879                 return;
1880
1881         if (xw.ime.xic)
1882                 len = XmbLookupString(xw.ime.xic, e, buf, sizeof buf, &ksym, &status);
1883         else
1884                 len = XLookupString(e, buf, sizeof buf, &ksym, NULL);
1885         /* 1. shortcuts */
1886         for (bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
1887                 if (ksym == bp->keysym && match(bp->mod, e->state)) {
1888                         bp->func(&(bp->arg));
1889                         return;
1890                 }
1891         }
1892
1893         /* 2. custom keys from config.h */
1894         if ((customkey = kmap(ksym, e->state))) {
1895                 ttywrite(customkey, strlen(customkey), 1);
1896                 return;
1897         }
1898
1899         /* 3. composed string from input method */
1900         if (len == 0)
1901                 return;
1902         if (len == 1 && e->state & Mod1Mask) {
1903                 if (IS_SET(MODE_8BIT)) {
1904                         if (*buf < 0177) {
1905                                 c = *buf | 0x80;
1906                                 len = utf8encode(c, buf);
1907                         }
1908                 } else {
1909                         buf[1] = buf[0];
1910                         buf[0] = '\033';
1911                         len = 2;
1912                 }
1913         }
1914         ttywrite(buf, len, 1);
1915 }
1916
1917 void
1918 cmessage(XEvent *e)
1919 {
1920         /*
1921          * See xembed specs
1922          *  http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
1923          */
1924         if (e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
1925                 if (e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
1926                         win.mode |= MODE_FOCUSED;
1927                         xseturgency(0);
1928                 } else if (e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
1929                         win.mode &= ~MODE_FOCUSED;
1930                 }
1931         } else if (e->xclient.data.l[0] == xw.wmdeletewin) {
1932                 ttyhangup();
1933                 exit(0);
1934         }
1935 }
1936
1937 void
1938 resize(XEvent *e)
1939 {
1940         if (e->xconfigure.width == win.w && e->xconfigure.height == win.h)
1941                 return;
1942
1943         cresize(e->xconfigure.width, e->xconfigure.height);
1944 }
1945
1946 void
1947 run(void)
1948 {
1949         XEvent ev;
1950         int w = win.w, h = win.h;
1951         fd_set rfd;
1952         int xfd = XConnectionNumber(xw.dpy), ttyfd, xev, drawing;
1953         struct timespec seltv, *tv, now, lastblink, trigger;
1954         double timeout;
1955
1956         /* Waiting for window mapping */
1957         do {
1958                 XNextEvent(xw.dpy, &ev);
1959                 /*
1960                  * This XFilterEvent call is required because of XOpenIM. It
1961                  * does filter out the key event and some client message for
1962                  * the input method too.
1963                  */
1964                 if (XFilterEvent(&ev, None))
1965                         continue;
1966                 if (ev.type == ConfigureNotify) {
1967                         w = ev.xconfigure.width;
1968                         h = ev.xconfigure.height;
1969                 }
1970         } while (ev.type != MapNotify);
1971
1972         ttyfd = ttynew(opt_line, shell, opt_io, opt_cmd);
1973         cresize(w, h);
1974
1975         for (timeout = -1, drawing = 0, lastblink = (struct timespec){0};;) {
1976                 FD_ZERO(&rfd);
1977                 FD_SET(ttyfd, &rfd);
1978                 FD_SET(xfd, &rfd);
1979
1980                 if (XPending(xw.dpy))
1981                         timeout = 0;  /* existing events might not set xfd */
1982
1983                 seltv.tv_sec = timeout / 1E3;
1984                 seltv.tv_nsec = 1E6 * (timeout - 1E3 * seltv.tv_sec);
1985                 tv = timeout >= 0 ? &seltv : NULL;
1986
1987                 if (pselect(MAX(xfd, ttyfd)+1, &rfd, NULL, NULL, tv, NULL) < 0) {
1988                         if (errno == EINTR)
1989                                 continue;
1990                         die("select failed: %s\n", strerror(errno));
1991                 }
1992                 clock_gettime(CLOCK_MONOTONIC, &now);
1993
1994                 if (FD_ISSET(ttyfd, &rfd))
1995                         ttyread();
1996
1997                 xev = 0;
1998                 while (XPending(xw.dpy)) {
1999                         xev = 1;
2000                         XNextEvent(xw.dpy, &ev);
2001                         if (XFilterEvent(&ev, None))
2002                                 continue;
2003                         if (handler[ev.type])
2004                                 (handler[ev.type])(&ev);
2005                 }
2006
2007                 /*
2008                  * To reduce flicker and tearing, when new content or event
2009                  * triggers drawing, we first wait a bit to ensure we got
2010                  * everything, and if nothing new arrives - we draw.
2011                  * We start with trying to wait minlatency ms. If more content
2012                  * arrives sooner, we retry with shorter and shorter periods,
2013                  * and eventually draw even without idle after maxlatency ms.
2014                  * Typically this results in low latency while interacting,
2015                  * maximum latency intervals during `cat huge.txt`, and perfect
2016                  * sync with periodic updates from animations/key-repeats/etc.
2017                  */
2018                 if (FD_ISSET(ttyfd, &rfd) || xev) {
2019                         if (!drawing) {
2020                                 trigger = now;
2021                                 drawing = 1;
2022                         }
2023                         timeout = (maxlatency - TIMEDIFF(now, trigger)) \
2024                                   / maxlatency * minlatency;
2025                         if (timeout > 0)
2026                                 continue;  /* we have time, try to find idle */
2027                 }
2028
2029                 /* idle detected or maxlatency exhausted -> draw */
2030                 timeout = -1;
2031                 if (blinktimeout && tattrset(ATTR_BLINK)) {
2032                         timeout = blinktimeout - TIMEDIFF(now, lastblink);
2033                         if (timeout <= 0) {
2034                                 if (-timeout > blinktimeout) /* start visible */
2035                                         win.mode |= MODE_BLINK;
2036                                 win.mode ^= MODE_BLINK;
2037                                 tsetdirtattr(ATTR_BLINK);
2038                                 lastblink = now;
2039                                 timeout = blinktimeout;
2040                         }
2041                 }
2042
2043                 draw();
2044                 XFlush(xw.dpy);
2045                 drawing = 0;
2046         }
2047 }
2048
2049 int
2050 resource_load(XrmDatabase db, char *name, enum resource_type rtype, void *dst)
2051 {
2052         char **sdst = dst;
2053         int *idst = dst;
2054         float *fdst = dst;
2055
2056         char fullname[256];
2057         char fullclass[256];
2058         char *type;
2059         XrmValue ret;
2060
2061         snprintf(fullname, sizeof(fullname), "%s.%s",
2062                         opt_name ? opt_name : "st", name);
2063         snprintf(fullclass, sizeof(fullclass), "%s.%s",
2064                         opt_class ? opt_class : "St", name);
2065         fullname[sizeof(fullname) - 1] = fullclass[sizeof(fullclass) - 1] = '\0';
2066
2067         XrmGetResource(db, fullname, fullclass, &type, &ret);
2068         if (ret.addr == NULL || strncmp("String", type, 64))
2069                 return 1;
2070
2071         switch (rtype) {
2072         case STRING:
2073                 *sdst = ret.addr;
2074                 break;
2075         case INTEGER:
2076                 *idst = strtoul(ret.addr, NULL, 10);
2077                 break;
2078         case FLOAT:
2079                 *fdst = strtof(ret.addr, NULL);
2080                 break;
2081         }
2082         return 0;
2083 }
2084
2085 void
2086 config_init(void)
2087 {
2088         char *resm;
2089         XrmDatabase db;
2090         ResourcePref *p;
2091
2092         XrmInitialize();
2093         resm = XResourceManagerString(xw.dpy);
2094         if (!resm)
2095                 return;
2096
2097         db = XrmGetStringDatabase(resm);
2098         for (p = resources; p < resources + LEN(resources); p++)
2099                 resource_load(db, p->name, p->type, p->dst);
2100 }
2101
2102 void
2103 usage(void)
2104 {
2105         die("usage: %s [-aiv] [-c class] [-f font] [-g geometry]"
2106             " [-n name] [-o file]\n"
2107             "          [-T title] [-t title] [-w windowid]"
2108             " [[-e] command [args ...]]\n"
2109             "       %s [-aiv] [-c class] [-f font] [-g geometry]"
2110             " [-n name] [-o file]\n"
2111             "          [-T title] [-t title] [-w windowid] -l line"
2112             " [stty_args ...]\n", argv0, argv0);
2113 }
2114
2115 int
2116 main(int argc, char *argv[])
2117 {
2118         xw.l = xw.t = 0;
2119         xw.isfixed = False;
2120         xsetcursor(cursorshape);
2121
2122         ARGBEGIN {
2123         case 'a':
2124                 allowaltscreen = 0;
2125                 break;
2126         case 'A':
2127                 opt_alpha = EARGF(usage());
2128                 break;
2129         case 'c':
2130                 opt_class = EARGF(usage());
2131                 break;
2132         case 'e':
2133                 if (argc > 0)
2134                         --argc, ++argv;
2135                 goto run;
2136         case 'f':
2137                 opt_font = EARGF(usage());
2138                 break;
2139         case 'g':
2140                 xw.gm = XParseGeometry(EARGF(usage()),
2141                                 &xw.l, &xw.t, &cols, &rows);
2142                 break;
2143         case 'i':
2144                 xw.isfixed = 1;
2145                 break;
2146         case 'o':
2147                 opt_io = EARGF(usage());
2148                 break;
2149         case 'l':
2150                 opt_line = EARGF(usage());
2151                 break;
2152         case 'n':
2153                 opt_name = EARGF(usage());
2154                 break;
2155         case 't':
2156         case 'T':
2157                 opt_title = EARGF(usage());
2158                 break;
2159         case 'w':
2160                 opt_embed = EARGF(usage());
2161                 break;
2162         case 'v':
2163                 die("%s " VERSION "\n", argv0);
2164                 break;
2165         default:
2166                 usage();
2167         } ARGEND;
2168
2169 run:
2170         if (argc > 0) /* eat all remaining arguments */
2171                 opt_cmd = argv;
2172
2173         if (!opt_title)
2174                 opt_title = (opt_line || !opt_cmd) ? "st" : opt_cmd[0];
2175
2176         setlocale(LC_CTYPE, "");
2177         XSetLocaleModifiers("");
2178
2179         if(!(xw.dpy = XOpenDisplay(NULL)))
2180                 die("Can't open display\n");
2181
2182         config_init();
2183         cols = MAX(cols, 1);
2184         rows = MAX(rows, 1);
2185         tnew(cols, rows);
2186         xinit(cols, rows);
2187         xsetenv();
2188         selinit();
2189         run();
2190
2191         return 0;
2192 }