drw.c - dwm - my customized version of dwm (hiltjo branch) (HTM) git clone git://git.codemadness.org/dwm (DIR) Log (DIR) Files (DIR) Refs (DIR) README (DIR) LICENSE --- drw.c (11609B) --- 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 } 207 208 /* Wrapper to create color schemes. The caller has to call free(3) on the 209 * returned color scheme when done using it. */ 210 Clr * 211 drw_scm_create(Drw *drw, const char *clrnames[], size_t clrcount) 212 { 213 size_t i; 214 Clr *ret; 215 216 /* need at least two colors for a scheme */ 217 if (!drw || !clrnames || clrcount < 2 || !(ret = ecalloc(clrcount, sizeof(XftColor)))) 218 return NULL; 219 220 for (i = 0; i < clrcount; i++) 221 drw_clr_create(drw, &ret[i], clrnames[i]); 222 return ret; 223 } 224 225 void 226 drw_setfontset(Drw *drw, Fnt *set) 227 { 228 if (drw) 229 drw->fonts = set; 230 } 231 232 void 233 drw_setscheme(Drw *drw, Clr *scm) 234 { 235 if (drw) 236 drw->scheme = scm; 237 } 238 239 void 240 drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int filled, int invert) 241 { 242 if (!drw || !drw->scheme) 243 return; 244 XSetForeground(drw->dpy, drw->gc, invert ? drw->scheme[ColBg].pixel : drw->scheme[ColFg].pixel); 245 if (filled) 246 XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h); 247 else 248 XDrawRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w - 1, h - 1); 249 } 250 251 int 252 drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lpad, const char *text, int invert) 253 { 254 int i, ty, ellipsis_x = 0; 255 unsigned int tmpw, ew, ellipsis_w = 0, ellipsis_len; 256 XftDraw *d = NULL; 257 Fnt *usedfont, *curfont, *nextfont; 258 int utf8strlen, utf8charlen, render = x || y || w || h; 259 long utf8codepoint = 0; 260 const char *utf8str; 261 FcCharSet *fccharset; 262 FcPattern *fcpattern; 263 FcPattern *match; 264 XftResult result; 265 int charexists = 0, overflow = 0; 266 /* keep track of a couple codepoints for which we have no match. */ 267 enum { nomatches_len = 64 }; 268 static struct { long codepoint[nomatches_len]; unsigned int idx; } nomatches; 269 static unsigned int ellipsis_width = 0; 270 271 if (!drw || (render && (!drw->scheme || !w)) || !text || !drw->fonts) 272 return 0; 273 274 if (!render) { 275 w = invert ? invert : ~invert; 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 if (!ellipsis_width && render) 288 ellipsis_width = drw_fontset_getwidth(drw, "..."); 289 while (1) { 290 ew = ellipsis_len = utf8strlen = 0; 291 utf8str = text; 292 nextfont = NULL; 293 while (*text) { 294 utf8charlen = utf8decode(text, &utf8codepoint, UTF_SIZ); 295 for (curfont = drw->fonts; curfont; curfont = curfont->next) { 296 charexists = charexists || XftCharExists(drw->dpy, curfont->xfont, utf8codepoint); 297 if (charexists) { 298 drw_font_getexts(curfont, text, utf8charlen, &tmpw, NULL); 299 if (ew + ellipsis_width <= w) { 300 /* keep track where the ellipsis still fits */ 301 ellipsis_x = x + ew; 302 ellipsis_w = w - ew; 303 ellipsis_len = utf8strlen; 304 } 305 306 if (ew + tmpw > w) { 307 overflow = 1; 308 /* called from drw_fontset_getwidth_clamp(): 309 * it wants the width AFTER the overflow 310 */ 311 if (!render) 312 x += tmpw; 313 else 314 utf8strlen = ellipsis_len; 315 } else if (curfont == usedfont) { 316 utf8strlen += utf8charlen; 317 text += utf8charlen; 318 ew += tmpw; 319 } else { 320 nextfont = curfont; 321 } 322 break; 323 } 324 } 325 326 if (overflow || !charexists || nextfont) 327 break; 328 else 329 charexists = 0; 330 } 331 332 if (utf8strlen) { 333 if (render) { 334 ty = y + (h - usedfont->h) / 2 + usedfont->xfont->ascent; 335 XftDrawStringUtf8(d, &drw->scheme[invert ? ColBg : ColFg], 336 usedfont->xfont, x, ty, (XftChar8 *)utf8str, utf8strlen); 337 } 338 x += ew; 339 w -= ew; 340 } 341 if (render && overflow) 342 drw_text(drw, ellipsis_x, y, ellipsis_w, h, 0, "...", invert); 343 344 if (!*text || overflow) { 345 break; 346 } else if (nextfont) { 347 charexists = 0; 348 usedfont = nextfont; 349 } else { 350 /* Regardless of whether or not a fallback font is found, the 351 * character must be drawn. */ 352 charexists = 1; 353 354 for (i = 0; i < nomatches_len; ++i) { 355 /* avoid calling XftFontMatch if we know we won't find a match */ 356 if (utf8codepoint == nomatches.codepoint[i]) 357 goto no_match; 358 } 359 360 fccharset = FcCharSetCreate(); 361 FcCharSetAddChar(fccharset, utf8codepoint); 362 363 if (!drw->fonts->pattern) { 364 /* Refer to the comment in xfont_create for more information. */ 365 die("the first font in the cache must be loaded from a font string."); 366 } 367 368 fcpattern = FcPatternDuplicate(drw->fonts->pattern); 369 FcPatternAddCharSet(fcpattern, FC_CHARSET, fccharset); 370 FcPatternAddBool(fcpattern, FC_SCALABLE, FcTrue); 371 FcPatternAddBool(fcpattern, FC_COLOR, FcFalse); 372 373 FcConfigSubstitute(NULL, fcpattern, FcMatchPattern); 374 FcDefaultSubstitute(fcpattern); 375 match = XftFontMatch(drw->dpy, drw->screen, fcpattern, &result); 376 377 FcCharSetDestroy(fccharset); 378 FcPatternDestroy(fcpattern); 379 380 if (match) { 381 usedfont = xfont_create(drw, NULL, match); 382 if (usedfont && XftCharExists(drw->dpy, usedfont->xfont, utf8codepoint)) { 383 for (curfont = drw->fonts; curfont->next; curfont = curfont->next) 384 ; /* NOP */ 385 curfont->next = usedfont; 386 } else { 387 xfont_free(usedfont); 388 nomatches.codepoint[++nomatches.idx % nomatches_len] = utf8codepoint; 389 no_match: 390 usedfont = drw->fonts; 391 } 392 } 393 } 394 } 395 if (d) 396 XftDrawDestroy(d); 397 398 return x + (render ? w : 0); 399 } 400 401 void 402 drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int h) 403 { 404 if (!drw) 405 return; 406 407 XCopyArea(drw->dpy, drw->drawable, win, drw->gc, x, y, w, h, x, y); 408 XSync(drw->dpy, False); 409 } 410 411 unsigned int 412 drw_fontset_getwidth(Drw *drw, const char *text) 413 { 414 if (!drw || !drw->fonts || !text) 415 return 0; 416 return drw_text(drw, 0, 0, 0, 0, 0, text, 0); 417 } 418 419 unsigned int 420 drw_fontset_getwidth_clamp(Drw *drw, const char *text, unsigned int n) 421 { 422 unsigned int tmp = 0; 423 if (drw && drw->fonts && text && n) 424 tmp = drw_text(drw, 0, 0, 0, 0, 0, text, n); 425 return MIN(n, tmp); 426 } 427 428 void 429 drw_font_getexts(Fnt *font, const char *text, unsigned int len, unsigned int *w, unsigned int *h) 430 { 431 XGlyphInfo ext; 432 433 if (!font || !text) 434 return; 435 436 XftTextExtentsUtf8(font->dpy, font->xfont, (XftChar8 *)text, len, &ext); 437 if (w) 438 *w = ext.xOff; 439 if (h) 440 *h = font->h; 441 } 442 443 Cur * 444 drw_cur_create(Drw *drw, int shape) 445 { 446 Cur *cur; 447 448 if (!drw || !(cur = ecalloc(1, sizeof(Cur)))) 449 return NULL; 450 451 cur->cursor = XCreateFontCursor(drw->dpy, shape); 452 453 return cur; 454 } 455 456 void 457 drw_cur_free(Drw *drw, Cur *cursor) 458 { 459 if (!cursor) 460 return; 461 462 XFreeCursor(drw->dpy, cursor->cursor); 463 free(cursor); 464 }