drw.c (11614B)
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 13 static int 14 utf8decode(const char *s_in, long *u, int *err) 15 { 16 static const unsigned char lens[] = { 17 /* 0XXXX */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 18 /* 10XXX */ 0, 0, 0, 0, 0, 0, 0, 0, /* invalid */ 19 /* 110XX */ 2, 2, 2, 2, 20 /* 1110X */ 3, 3, 21 /* 11110 */ 4, 22 /* 11111 */ 0, /* invalid */ 23 }; 24 static const unsigned char leading_mask[] = { 0x7F, 0x1F, 0x0F, 0x07 }; 25 static const unsigned int overlong[] = { 0x0, 0x80, 0x0800, 0x10000 }; 26 27 const unsigned char *s = (const unsigned char *)s_in; 28 int len = lens[*s >> 3]; 29 *u = UTF_INVALID; 30 *err = 1; 31 if (len == 0) 32 return 1; 33 34 long cp = s[0] & leading_mask[len - 1]; 35 for (int i = 1; i < len; ++i) { 36 if (s[i] == '\0' || (s[i] & 0xC0) != 0x80) 37 return i; 38 cp = (cp << 6) | (s[i] & 0x3F); 39 } 40 /* out of range, surrogate, overlong encoding */ 41 if (cp > 0x10FFFF || (cp >> 11) == 0x1B || cp < overlong[len - 1]) 42 return len; 43 44 *err = 0; 45 *u = cp; 46 return len; 47 } 48 49 Drw * 50 drw_create(Display *dpy, int screen, Window root, unsigned int w, unsigned int h) 51 { 52 Drw *drw = ecalloc(1, sizeof(Drw)); 53 54 drw->dpy = dpy; 55 drw->screen = screen; 56 drw->root = root; 57 drw->w = w; 58 drw->h = h; 59 drw->drawable = XCreatePixmap(dpy, root, w, h, DefaultDepth(dpy, screen)); 60 drw->gc = XCreateGC(dpy, root, 0, NULL); 61 XSetLineAttributes(dpy, drw->gc, 1, LineSolid, CapButt, JoinMiter); 62 63 return drw; 64 } 65 66 void 67 drw_resize(Drw *drw, unsigned int w, unsigned int h) 68 { 69 if (!drw) 70 return; 71 72 drw->w = w; 73 drw->h = h; 74 if (drw->drawable) 75 XFreePixmap(drw->dpy, drw->drawable); 76 drw->drawable = XCreatePixmap(drw->dpy, drw->root, w, h, DefaultDepth(drw->dpy, drw->screen)); 77 } 78 79 void 80 drw_free(Drw *drw) 81 { 82 XFreePixmap(drw->dpy, drw->drawable); 83 XFreeGC(drw->dpy, drw->gc); 84 drw_fontset_free(drw->fonts); 85 free(drw); 86 } 87 88 /* This function is an implementation detail. Library users should use 89 * drw_fontset_create instead. 90 */ 91 static Fnt * 92 xfont_create(Drw *drw, const char *fontname, FcPattern *fontpattern) 93 { 94 Fnt *font; 95 XftFont *xfont = NULL; 96 FcPattern *pattern = NULL; 97 98 if (fontname) { 99 /* Using the pattern found at font->xfont->pattern does not yield the 100 * same substitution results as using the pattern returned by 101 * FcNameParse; using the latter results in the desired fallback 102 * behaviour whereas the former just results in missing-character 103 * rectangles being drawn, at least with some fonts. */ 104 if (!(xfont = XftFontOpenName(drw->dpy, drw->screen, fontname))) { 105 fprintf(stderr, "error, cannot load font from name: '%s'\n", fontname); 106 return NULL; 107 } 108 if (!(pattern = FcNameParse((FcChar8 *) fontname))) { 109 fprintf(stderr, "error, cannot parse font name to pattern: '%s'\n", fontname); 110 XftFontClose(drw->dpy, xfont); 111 return NULL; 112 } 113 } else if (fontpattern) { 114 if (!(xfont = XftFontOpenPattern(drw->dpy, fontpattern))) { 115 fprintf(stderr, "error, cannot load font from pattern.\n"); 116 return NULL; 117 } 118 } else { 119 die("no font specified."); 120 } 121 122 font = ecalloc(1, sizeof(Fnt)); 123 font->xfont = xfont; 124 font->pattern = pattern; 125 font->h = xfont->ascent + xfont->descent; 126 font->dpy = drw->dpy; 127 128 return font; 129 } 130 131 static void 132 xfont_free(Fnt *font) 133 { 134 if (!font) 135 return; 136 if (font->pattern) 137 FcPatternDestroy(font->pattern); 138 XftFontClose(font->dpy, font->xfont); 139 free(font); 140 } 141 142 Fnt* 143 drw_fontset_create(Drw* drw, const char *fonts[], size_t fontcount) 144 { 145 Fnt *cur, *ret = NULL; 146 size_t i; 147 148 if (!drw || !fonts) 149 return NULL; 150 151 for (i = 1; i <= fontcount; i++) { 152 if ((cur = xfont_create(drw, fonts[fontcount - i], NULL))) { 153 cur->next = ret; 154 ret = cur; 155 } 156 } 157 return (drw->fonts = ret); 158 } 159 160 void 161 drw_fontset_free(Fnt *font) 162 { 163 if (font) { 164 drw_fontset_free(font->next); 165 xfont_free(font); 166 } 167 } 168 169 void 170 drw_clr_create(Drw *drw, Clr *dest, const char *clrname) 171 { 172 if (!drw || !dest || !clrname) 173 return; 174 175 if (!XftColorAllocName(drw->dpy, DefaultVisual(drw->dpy, drw->screen), 176 DefaultColormap(drw->dpy, drw->screen), 177 clrname, dest)) 178 die("error, cannot allocate color '%s'", clrname); 179 180 dest->pixel |= 0xff << 24; 181 } 182 183 /* Create color schemes. */ 184 Clr * 185 drw_scm_create(Drw *drw, const char *clrnames[], size_t clrcount) 186 { 187 size_t i; 188 Clr *ret; 189 190 /* need at least two colors for a scheme */ 191 if (!drw || !clrnames || clrcount < 2 || !(ret = ecalloc(clrcount, sizeof(Clr)))) 192 return NULL; 193 194 for (i = 0; i < clrcount; i++) 195 drw_clr_create(drw, &ret[i], clrnames[i]); 196 return ret; 197 } 198 199 void 200 drw_clr_free(Drw *drw, Clr *c) 201 { 202 if (!drw || !c) 203 return; 204 205 /* c is typedef XftColor Clr */ 206 XftColorFree(drw->dpy, DefaultVisual(drw->dpy, drw->screen), 207 DefaultColormap(drw->dpy, drw->screen), c); 208 } 209 210 void 211 drw_scm_free(Drw *drw, Clr *scm, size_t clrcount) 212 { 213 size_t i; 214 215 if (!drw || !scm) 216 return; 217 218 for (i = 0; i < clrcount; i++) 219 drw_clr_free(drw, &scm[i]); 220 free(scm); 221 } 222 223 void 224 drw_setfontset(Drw *drw, Fnt *set) 225 { 226 if (drw) 227 drw->fonts = set; 228 } 229 230 void 231 drw_setscheme(Drw *drw, Clr *scm) 232 { 233 if (drw) 234 drw->scheme = scm; 235 } 236 237 void 238 drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int filled, int invert) 239 { 240 if (!drw || !drw->scheme) 241 return; 242 XSetForeground(drw->dpy, drw->gc, invert ? drw->scheme[ColBg].pixel : drw->scheme[ColFg].pixel); 243 if (filled) 244 XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h); 245 else 246 XDrawRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w - 1, h - 1); 247 } 248 249 int 250 drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lpad, const char *text, int invert) 251 { 252 int ty, ellipsis_x = 0; 253 unsigned int tmpw, ew, ellipsis_w = 0, ellipsis_len, hash, h0, h1; 254 XftDraw *d = NULL; 255 Fnt *usedfont, *curfont, *nextfont; 256 int utf8strlen, utf8charlen, utf8err, render = x || y || w || h; 257 long utf8codepoint = 0; 258 const char *utf8str; 259 FcCharSet *fccharset; 260 FcPattern *fcpattern; 261 FcPattern *match; 262 XftResult result; 263 int charexists = 0, overflow = 0; 264 /* keep track of a couple codepoints for which we have no match. */ 265 static unsigned int nomatches[128], ellipsis_width, invalid_width; 266 static const char invalid[] = "�"; 267 268 if (!drw || (render && (!drw->scheme || !w)) || !text || !drw->fonts) 269 return 0; 270 271 if (!render) { 272 w = invert ? invert : ~invert; 273 } else { 274 XSetForeground(drw->dpy, drw->gc, drw->scheme[invert ? ColFg : ColBg].pixel); 275 XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h); 276 if (w < lpad) 277 return x + w; 278 d = XftDrawCreate(drw->dpy, drw->drawable, 279 DefaultVisual(drw->dpy, drw->screen), 280 DefaultColormap(drw->dpy, drw->screen)); 281 x += lpad; 282 w -= lpad; 283 } 284 285 usedfont = drw->fonts; 286 if (!ellipsis_width && render) 287 ellipsis_width = drw_fontset_getwidth(drw, "..."); 288 if (!invalid_width && render) 289 invalid_width = drw_fontset_getwidth(drw, invalid); 290 while (1) { 291 ew = ellipsis_len = utf8err = utf8charlen = utf8strlen = 0; 292 utf8str = text; 293 nextfont = NULL; 294 while (*text) { 295 utf8charlen = utf8decode(text, &utf8codepoint, &utf8err); 296 for (curfont = drw->fonts; curfont; curfont = curfont->next) { 297 charexists = charexists || XftCharExists(drw->dpy, curfont->xfont, utf8codepoint); 298 if (charexists) { 299 drw_font_getexts(curfont, text, utf8charlen, &tmpw, NULL); 300 if (ew + ellipsis_width <= w) { 301 /* keep track where the ellipsis still fits */ 302 ellipsis_x = x + ew; 303 ellipsis_w = w - ew; 304 ellipsis_len = utf8strlen; 305 } 306 307 if (ew + tmpw > w) { 308 overflow = 1; 309 /* called from drw_fontset_getwidth_clamp(): 310 * it wants the width AFTER the overflow 311 */ 312 if (!render) 313 x += tmpw; 314 else 315 utf8strlen = ellipsis_len; 316 } else if (curfont == usedfont) { 317 text += utf8charlen; 318 utf8strlen += utf8err ? 0 : utf8charlen; 319 ew += utf8err ? 0 : tmpw; 320 } else { 321 nextfont = curfont; 322 } 323 break; 324 } 325 } 326 327 if (overflow || !charexists || nextfont || utf8err) 328 break; 329 else 330 charexists = 0; 331 } 332 333 if (utf8strlen) { 334 if (render) { 335 ty = y + (h - usedfont->h) / 2 + usedfont->xfont->ascent; 336 XftDrawStringUtf8(d, &drw->scheme[invert ? ColBg : ColFg], 337 usedfont->xfont, x, ty, (XftChar8 *)utf8str, utf8strlen); 338 } 339 x += ew; 340 w -= ew; 341 } 342 if (utf8err && (!render || invalid_width < w)) { 343 if (render) 344 drw_text(drw, x, y, w, h, 0, invalid, invert); 345 x += invalid_width; 346 w -= invalid_width; 347 } 348 if (render && overflow) 349 drw_text(drw, ellipsis_x, y, ellipsis_w, h, 0, "...", invert); 350 351 if (!*text || overflow) { 352 break; 353 } else if (nextfont) { 354 charexists = 0; 355 usedfont = nextfont; 356 } else { 357 /* Regardless of whether or not a fallback font is found, the 358 * character must be drawn. */ 359 charexists = 1; 360 361 hash = (unsigned int)utf8codepoint; 362 hash = ((hash >> 16) ^ hash) * 0x21F0AAAD; 363 hash = ((hash >> 15) ^ hash) * 0xD35A2D97; 364 h0 = ((hash >> 15) ^ hash) % LENGTH(nomatches); 365 h1 = (hash >> 17) % LENGTH(nomatches); 366 /* avoid expensive XftFontMatch call when we know we won't find a match */ 367 if (nomatches[h0] == utf8codepoint || nomatches[h1] == utf8codepoint) 368 goto no_match; 369 370 fccharset = FcCharSetCreate(); 371 FcCharSetAddChar(fccharset, utf8codepoint); 372 373 if (!drw->fonts->pattern) { 374 /* Refer to the comment in xfont_create for more information. */ 375 die("the first font in the cache must be loaded from a font string."); 376 } 377 378 fcpattern = FcPatternDuplicate(drw->fonts->pattern); 379 FcPatternAddCharSet(fcpattern, FC_CHARSET, fccharset); 380 FcPatternAddBool(fcpattern, FC_SCALABLE, FcTrue); 381 382 FcConfigSubstitute(NULL, fcpattern, FcMatchPattern); 383 FcDefaultSubstitute(fcpattern); 384 match = XftFontMatch(drw->dpy, drw->screen, fcpattern, &result); 385 386 FcCharSetDestroy(fccharset); 387 FcPatternDestroy(fcpattern); 388 389 if (match) { 390 usedfont = xfont_create(drw, NULL, match); 391 if (usedfont && XftCharExists(drw->dpy, usedfont->xfont, utf8codepoint)) { 392 for (curfont = drw->fonts; curfont->next; curfont = curfont->next) 393 ; /* NOP */ 394 curfont->next = usedfont; 395 } else { 396 xfont_free(usedfont); 397 nomatches[nomatches[h0] ? h1 : h0] = utf8codepoint; 398 no_match: 399 usedfont = drw->fonts; 400 } 401 } 402 } 403 } 404 if (d) 405 XftDrawDestroy(d); 406 407 return x + (render ? w : 0); 408 } 409 410 void 411 drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int h) 412 { 413 if (!drw) 414 return; 415 416 XCopyArea(drw->dpy, drw->drawable, win, drw->gc, x, y, w, h, x, y); 417 XSync(drw->dpy, False); 418 } 419 420 unsigned int 421 drw_fontset_getwidth(Drw *drw, const char *text) 422 { 423 if (!drw || !drw->fonts || !text) 424 return 0; 425 return drw_text(drw, 0, 0, 0, 0, 0, text, 0); 426 } 427 428 unsigned int 429 drw_fontset_getwidth_clamp(Drw *drw, const char *text, unsigned int n) 430 { 431 unsigned int tmp = 0; 432 if (drw && drw->fonts && text && n) 433 tmp = drw_text(drw, 0, 0, 0, 0, 0, text, n); 434 return MIN(n, tmp); 435 } 436 437 void 438 drw_font_getexts(Fnt *font, const char *text, unsigned int len, unsigned int *w, unsigned int *h) 439 { 440 XGlyphInfo ext; 441 442 if (!font || !text) 443 return; 444 445 XftTextExtentsUtf8(font->dpy, font->xfont, (XftChar8 *)text, len, &ext); 446 if (w) 447 *w = ext.xOff; 448 if (h) 449 *h = font->h; 450 } 451 452 Cur * 453 drw_cur_create(Drw *drw, int shape) 454 { 455 Cur *cur; 456 457 if (!drw || !(cur = ecalloc(1, sizeof(Cur)))) 458 return NULL; 459 460 cur->cursor = XCreateFontCursor(drw->dpy, shape); 461 462 return cur; 463 } 464 465 void 466 drw_cur_free(Drw *drw, Cur *cursor) 467 { 468 if (!cursor) 469 return; 470 471 XFreeCursor(drw->dpy, cursor->cursor); 472 free(cursor); 473 }