drw.c - dwm - my fork of dwm

drw.c (10554B)
Line numbers
   1 /* See LICENSE file for copyright and license details. */
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4 #include <string.h>
   5 #include <X11/Xlib.h>
   6 #include <X11/Xft/Xft.h>
   7 
   8 #include "drw.h"
   9 #include "util.h"
  10 
  11 #define UTF_INVALID 0xFFFD
  12 #define UTF_SIZ     4
  13 
  14 static const unsigned char utfbyte[UTF_SIZ + 1] = {0x80,    0, 0xC0, 0xE0, 0xF0};
  15 static const unsigned char utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
  16 static const long utfmin[UTF_SIZ + 1] = {       0,    0,  0x80,  0x800,  0x10000};
  17 static const long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
  18 
  19 static long
  20 utf8decodebyte(const char c, size_t *i)
  21 {
  22     for (*i = 0; *i < (UTF_SIZ + 1); ++(*i))
  23         if (((unsigned char)c & utfmask[*i]) == utfbyte[*i])
  24             return (unsigned char)c & ~utfmask[*i];
  25     return 0;
  26 }
  27 
  28 static size_t
  29 utf8validate(long *u, size_t i)
  30 {
  31     if (!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
  32         *u = UTF_INVALID;
  33     for (i = 1; *u > utfmax[i]; ++i)
  34         ;
  35     return i;
  36 }
  37 
  38 static size_t
  39 utf8decode(const char *c, long *u, size_t clen)
  40 {
  41     size_t i, j, len, type;
  42     long udecoded;
  43 
  44     *u = UTF_INVALID;
  45     if (!clen)
  46         return 0;
  47     udecoded = utf8decodebyte(c[0], &len);
  48     if (!BETWEEN(len, 1, UTF_SIZ))
  49         return 1;
  50     for (i = 1, j = 1; i < clen && j < len; ++i, ++j) {
  51         udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
  52         if (type)
  53             return j;
  54     }
  55     if (j < len)
  56         return 0;
  57     *u = udecoded;
  58     utf8validate(u, len);
  59 
  60     return len;
  61 }
  62 
  63 Drw *
  64 drw_create(Display *dpy, int screen, Window root, unsigned int w, unsigned int h)
  65 {
  66     Drw *drw = ecalloc(1, sizeof(Drw));
  67 
  68     drw->dpy = dpy;
  69     drw->screen = screen;
  70     drw->root = root;
  71     drw->w = w;
  72     drw->h = h;
  73     drw->drawable = XCreatePixmap(dpy, root, w, h, DefaultDepth(dpy, screen));
  74     drw->gc = XCreateGC(dpy, root, 0, NULL);
  75     XSetLineAttributes(dpy, drw->gc, 1, LineSolid, CapButt, JoinMiter);
  76 
  77     return drw;
  78 }
  79 
  80 void
  81 drw_resize(Drw *drw, unsigned int w, unsigned int h)
  82 {
  83     if (!drw)
  84         return;
  85 
  86     drw->w = w;
  87     drw->h = h;
  88     if (drw->drawable)
  89         XFreePixmap(drw->dpy, drw->drawable);
  90     drw->drawable = XCreatePixmap(drw->dpy, drw->root, w, h, DefaultDepth(drw->dpy, drw->screen));
  91 }
  92 
  93 void
  94 drw_free(Drw *drw)
  95 {
  96     XFreePixmap(drw->dpy, drw->drawable);
  97     XFreeGC(drw->dpy, drw->gc);
  98     drw_fontset_free(drw->fonts);
  99     free(drw);
 100 }
 101 
 102 /* This function is an implementation detail. Library users should use
 103  * drw_fontset_create instead.
 104  */
 105 static Fnt *
 106 xfont_create(Drw *drw, const char *fontname, FcPattern *fontpattern)
 107 {
 108     Fnt *font;
 109     XftFont *xfont = NULL;
 110     FcPattern *pattern = NULL;
 111 
 112     if (fontname) {
 113         /* Using the pattern found at font->xfont->pattern does not yield the
 114          * same substitution results as using the pattern returned by
 115          * FcNameParse; using the latter results in the desired fallback
 116          * behaviour whereas the former just results in missing-character
 117          * rectangles being drawn, at least with some fonts. */
 118         if (!(xfont = XftFontOpenName(drw->dpy, drw->screen, fontname))) {
 119             fprintf(stderr, "error, cannot load font from name: '%s'\n", fontname);
 120             return NULL;
 121         }
 122         if (!(pattern = FcNameParse((FcChar8 *) fontname))) {
 123             fprintf(stderr, "error, cannot parse font name to pattern: '%s'\n", fontname);
 124             XftFontClose(drw->dpy, xfont);
 125             return NULL;
 126         }
 127     } else if (fontpattern) {
 128         if (!(xfont = XftFontOpenPattern(drw->dpy, fontpattern))) {
 129             fprintf(stderr, "error, cannot load font from pattern.\n");
 130             return NULL;
 131         }
 132     } else {
 133         die("no font specified.");
 134     }
 135 
 136     /* Do not allow using color fonts. This is a workaround for a BadLength
 137      * error from Xft with color glyphs. Modelled on the Xterm workaround. See
 138      * https://bugzilla.redhat.com/show_bug.cgi?id=1498269
 139      * https://lists.suckless.org/dev/1701/30932.html
 140      * https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=916349
 141      * and lots more all over the internet.
 142      */
 143     /* FcBool iscol; */
 144     /* if(FcPatternGetBool(xfont->pattern, FC_COLOR, 0, &iscol) == FcResultMatch && iscol) { */
 145     /*     XftFontClose(drw->dpy, xfont); */
 146     /*     return NULL; */
 147     /* } */
 148 
 149     font = ecalloc(1, sizeof(Fnt));
 150     font->xfont = xfont;
 151     font->pattern = pattern;
 152     font->h = xfont->ascent + xfont->descent;
 153     font->dpy = drw->dpy;
 154 
 155     return font;
 156 }
 157 
 158 static void
 159 xfont_free(Fnt *font)
 160 {
 161     if (!font)
 162         return;
 163     if (font->pattern)
 164         FcPatternDestroy(font->pattern);
 165     XftFontClose(font->dpy, font->xfont);
 166     free(font);
 167 }
 168 
 169 Fnt*
 170 drw_fontset_create(Drw* drw, const char *fonts[], size_t fontcount)
 171 {
 172     Fnt *cur, *ret = NULL;
 173     size_t i;
 174 
 175     if (!drw || !fonts)
 176         return NULL;
 177 
 178     for (i = 1; i <= fontcount; i++) {
 179         if ((cur = xfont_create(drw, fonts[fontcount - i], NULL))) {
 180             cur->next = ret;
 181             ret = cur;
 182         }
 183     }
 184     return (drw->fonts = ret);
 185 }
 186 
 187 void
 188 drw_fontset_free(Fnt *font)
 189 {
 190     if (font) {
 191         drw_fontset_free(font->next);
 192         xfont_free(font);
 193     }
 194 }
 195 
 196 void
 197 drw_clr_create(Drw *drw, Clr *dest, const char *clrname)
 198 {
 199     if (!drw || !dest || !clrname)
 200         return;
 201 
 202     if (!XftColorAllocName(drw->dpy, DefaultVisual(drw->dpy, drw->screen),
 203                            DefaultColormap(drw->dpy, drw->screen),
 204                            clrname, dest))
 205         die("error, cannot allocate color '%s'", clrname);
 206 
 207     dest->pixel |= 0xff << 24;
 208 }
 209 
 210 /* Wrapper to create color schemes. The caller has to call free(3) on the
 211  * returned color scheme when done using it. */
 212 Clr *
 213 drw_scm_create(Drw *drw, const char *clrnames[], size_t clrcount)
 214 {
 215     size_t i;
 216     Clr *ret;
 217 
 218     /* need at least two colors for a scheme */
 219     if (!drw || !clrnames || clrcount < 2 || !(ret = ecalloc(clrcount, sizeof(XftColor))))
 220         return NULL;
 221 
 222     for (i = 0; i < clrcount; i++)
 223         drw_clr_create(drw, &ret[i], clrnames[i]);
 224     return ret;
 225 }
 226 
 227 void
 228 drw_setfontset(Drw *drw, Fnt *set)
 229 {
 230     if (drw)
 231         drw->fonts = set;
 232 }
 233 
 234 void
 235 drw_setscheme(Drw *drw, Clr *scm)
 236 {
 237     if (drw)
 238         drw->scheme = scm;
 239 }
 240 
 241 void
 242 drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int filled, int invert)
 243 {
 244     if (!drw || !drw->scheme)
 245         return;
 246     XSetForeground(drw->dpy, drw->gc, invert ? drw->scheme[ColBg].pixel : drw->scheme[ColFg].pixel);
 247     if (filled)
 248         XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
 249     else
 250         XDrawRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w - 1, h - 1);
 251 }
 252 
 253 int
 254 drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lpad, const char *text, int invert)
 255 {
 256     char buf[1024];
 257     int ty;
 258     unsigned int ew;
 259     XftDraw *d = NULL;
 260     Fnt *usedfont, *curfont, *nextfont;
 261     size_t i, len;
 262     int utf8strlen, utf8charlen, render = x || y || w || h;
 263     long utf8codepoint = 0;
 264     const char *utf8str;
 265     FcCharSet *fccharset;
 266     FcPattern *fcpattern;
 267     FcPattern *match;
 268     XftResult result;
 269     int charexists = 0;
 270 
 271     if (!drw || (render && !drw->scheme) || !text || !drw->fonts)
 272         return 0;
 273 
 274     if (!render) {
 275         w = ~w;
 276     } else {
 277         XSetForeground(drw->dpy, drw->gc, drw->scheme[invert ? ColFg : ColBg].pixel);
 278         XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
 279         d = XftDrawCreate(drw->dpy, drw->drawable,
 280                           DefaultVisual(drw->dpy, drw->screen),
 281                           DefaultColormap(drw->dpy, drw->screen));
 282         x += lpad;
 283         w -= lpad;
 284     }
 285 
 286     usedfont = drw->fonts;
 287     while (1) {
 288         utf8strlen = 0;
 289         utf8str = text;
 290         nextfont = NULL;
 291         while (*text) {
 292             utf8charlen = utf8decode(text, &utf8codepoint, UTF_SIZ);
 293             for (curfont = drw->fonts; curfont; curfont = curfont->next) {
 294                 charexists = charexists || XftCharExists(drw->dpy, curfont->xfont, utf8codepoint);
 295                 if (charexists) {
 296                     if (curfont == usedfont) {
 297                         utf8strlen += utf8charlen;
 298                         text += utf8charlen;
 299                     } else {
 300                         nextfont = curfont;
 301                     }
 302                     break;
 303                 }
 304             }
 305 
 306             if (!charexists || nextfont)
 307                 break;
 308             else
 309                 charexists = 0;
 310         }
 311 
 312         if (utf8strlen) {
 313             drw_font_getexts(usedfont, utf8str, utf8strlen, &ew, NULL);
 314             /* shorten text if necessary */
 315             for (len = MIN(utf8strlen, sizeof(buf) - 1); len && ew > w; len--)
 316                 drw_font_getexts(usedfont, utf8str, len, &ew, NULL);
 317 
 318             if (len) {
 319                 memcpy(buf, utf8str, len);
 320                 buf[len] = '\0';
 321                 if (len < utf8strlen)
 322                     for (i = len; i && i > len - 3; buf[--i] = '.')
 323                         ; /* NOP */
 324 
 325                 if (render) {
 326                     ty = y + (h - usedfont->h) / 2 + usedfont->xfont->ascent;
 327                     XftDrawStringUtf8(d, &drw->scheme[invert ? ColBg : ColFg],
 328                                       usedfont->xfont, x, ty, (XftChar8 *)buf, len);
 329                 }
 330                 x += ew;
 331                 w -= ew;
 332             }
 333         }
 334 
 335         if (!*text) {
 336             break;
 337         } else if (nextfont) {
 338             charexists = 0;
 339             usedfont = nextfont;
 340         } else {
 341             /* Regardless of whether or not a fallback font is found, the
 342              * character must be drawn. */
 343             charexists = 1;
 344 
 345             fccharset = FcCharSetCreate();
 346             FcCharSetAddChar(fccharset, utf8codepoint);
 347 
 348             if (!drw->fonts->pattern) {
 349                 /* Refer to the comment in xfont_create for more information. */
 350                 die("the first font in the cache must be loaded from a font string.");
 351             }
 352 
 353             fcpattern = FcPatternDuplicate(drw->fonts->pattern);
 354             FcPatternAddCharSet(fcpattern, FC_CHARSET, fccharset);
 355             FcPatternAddBool(fcpattern, FC_SCALABLE, FcTrue);
 356             FcPatternAddBool(fcpattern, FC_COLOR, FcFalse);
 357 
 358             FcConfigSubstitute(NULL, fcpattern, FcMatchPattern);
 359             FcDefaultSubstitute(fcpattern);
 360             match = XftFontMatch(drw->dpy, drw->screen, fcpattern, &result);
 361 
 362             FcCharSetDestroy(fccharset);
 363             FcPatternDestroy(fcpattern);
 364 
 365             if (match) {
 366                 usedfont = xfont_create(drw, NULL, match);
 367                 if (usedfont && XftCharExists(drw->dpy, usedfont->xfont, utf8codepoint)) {
 368                     for (curfont = drw->fonts; curfont->next; curfont = curfont->next)
 369                         ; /* NOP */
 370                     curfont->next = usedfont;
 371                 } else {
 372                     xfont_free(usedfont);
 373                     usedfont = drw->fonts;
 374                 }
 375             }
 376         }
 377     }
 378     if (d)
 379         XftDrawDestroy(d);
 380 
 381     return x + (render ? w : 0);
 382 }
 383 
 384 void
 385 drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int h)
 386 {
 387     if (!drw)
 388         return;
 389 
 390     XCopyArea(drw->dpy, drw->drawable, win, drw->gc, x, y, w, h, x, y);
 391     XSync(drw->dpy, False);
 392 }
 393 
 394 unsigned int
 395 drw_fontset_getwidth(Drw *drw, const char *text)
 396 {
 397     if (!drw || !drw->fonts || !text)
 398         return 0;
 399     return drw_text(drw, 0, 0, 0, 0, 0, text, 0);
 400 }
 401 
 402 void
 403 drw_font_getexts(Fnt *font, const char *text, unsigned int len, unsigned int *w, unsigned int *h)
 404 {
 405     XGlyphInfo ext;
 406 
 407     if (!font || !text)
 408         return;
 409 
 410     XftTextExtentsUtf8(font->dpy, font->xfont, (XftChar8 *)text, len, &ext);
 411     if (w)
 412         *w = ext.xOff;
 413     if (h)
 414         *h = font->h;
 415 }
 416 
 417 Cur *
 418 drw_cur_create(Drw *drw, int shape)
 419 {
 420     Cur *cur;
 421 
 422     if (!drw || !(cur = ecalloc(1, sizeof(Cur))))
 423         return NULL;
 424 
 425     cur->cursor = XCreateFontCursor(drw->dpy, shape);
 426 
 427     return cur;
 428 }
 429 
 430 void
 431 drw_cur_free(Drw *drw, Cur *cursor)
 432 {
 433     if (!cursor)
 434         return;
 435 
 436     XFreeCursor(drw->dpy, cursor->cursor);
 437     free(cursor);
 438 }