| 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 | font = ecalloc(1, sizeof(Fnt)); |
| 137 | font->xfont = xfont; |
| 138 | font->pattern = pattern; |
| 139 | font->h = xfont->ascent + xfont->descent; |
| 140 | font->dpy = drw->dpy; |
| 141 | |
| 142 | return font; |
| 143 | } |
| 144 | |
| 145 | static void |
| 146 | xfont_free(Fnt *font) |
| 147 | { |
| 148 | if (!font) |
| 149 | return; |
| 150 | if (font->pattern) |
| 151 | FcPatternDestroy(font->pattern); |
| 152 | XftFontClose(font->dpy, font->xfont); |
| 153 | free(font); |
| 154 | } |
| 155 | |
| 156 | Fnt* |
| 157 | drw_fontset_create(Drw* drw, const char *fonts[], size_t fontcount) |
| 158 | { |
| 159 | Fnt *cur, *ret = NULL; |
| 160 | size_t i; |
| 161 | |
| 162 | if (!drw || !fonts) |
| 163 | return NULL; |
| 164 | |
| 165 | for (i = 1; i <= fontcount; i++) { |
| 166 | if ((cur = xfont_create(drw, fonts[fontcount - i], NULL))) { |
| 167 | cur->next = ret; |
| 168 | ret = cur; |
| 169 | } |
| 170 | } |
| 171 | return (drw->fonts = ret); |
| 172 | } |
| 173 | |
| 174 | void |
| 175 | drw_fontset_free(Fnt *font) |
| 176 | { |
| 177 | if (font) { |
| 178 | drw_fontset_free(font->next); |
| 179 | xfont_free(font); |
| 180 | } |
| 181 | } |
| 182 | |
| 183 | void |
| 184 | drw_clr_create(Drw *drw, Clr *dest, const char *clrname) |
| 185 | { |
| 186 | if (!drw || !dest || !clrname) |
| 187 | return; |
| 188 | |
| 189 | if (!XftColorAllocName(drw->dpy, DefaultVisual(drw->dpy, drw->screen), |
| 190 | DefaultColormap(drw->dpy, drw->screen), |
| 191 | clrname, dest)) |
| 192 | die("error, cannot allocate color '%s'", clrname); |
| 193 | } |
| 194 | |
| 195 | /* Wrapper to create color schemes. The caller has to call free(3) on the |
| 196 | * returned color scheme when done using it. */ |
| 197 | Clr * |
| 198 | drw_scm_create(Drw *drw, const char *clrnames[], size_t clrcount) |
| 199 | { |
| 200 | size_t i; |
| 201 | Clr *ret; |
| 202 | |
| 203 | /* need at least two colors for a scheme */ |
| 204 | if (!drw || !clrnames || clrcount < 2 || !(ret = ecalloc(clrcount, sizeof(XftColor)))) |
| 205 | return NULL; |
| 206 | |
| 207 | for (i = 0; i < clrcount; i++) |
| 208 | drw_clr_create(drw, &ret[i], clrnames[i]); |
| 209 | return ret; |
| 210 | } |
| 211 | |
| 212 | void |
| 213 | drw_setfontset(Drw *drw, Fnt *set) |
| 214 | { |
| 215 | if (drw) |
| 216 | drw->fonts = set; |
| 217 | } |
| 218 | |
| 219 | void |
| 220 | drw_setscheme(Drw *drw, Clr *scm) |
| 221 | { |
| 222 | if (drw) |
| 223 | drw->scheme = scm; |
| 224 | } |
| 225 | |
| 226 | void |
| 227 | drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int filled, int invert) |
| 228 | { |
| 229 | if (!drw || !drw->scheme) |
| 230 | return; |
| 231 | XSetForeground(drw->dpy, drw->gc, invert ? drw->scheme[ColBg].pixel : drw->scheme[ColFg].pixel); |
| 232 | if (filled) |
| 233 | XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h); |
| 234 | else |
| 235 | XDrawRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w - 1, h - 1); |
| 236 | } |
| 237 | |
| 238 | int |
| 239 | drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lpad, const char *text, int invert) |
| 240 | { |
| 241 | int i, ty, ellipsis_x = 0; |
| 242 | unsigned int tmpw, ew, ellipsis_w = 0, ellipsis_len; |
| 243 | XftDraw *d = NULL; |
| 244 | Fnt *usedfont, *curfont, *nextfont; |
| 245 | int utf8strlen, utf8charlen, render = x || y || w || h; |
| 246 | long utf8codepoint = 0; |
| 247 | const char *utf8str; |
| 248 | FcCharSet *fccharset; |
| 249 | FcPattern *fcpattern; |
| 250 | FcPattern *match; |
| 251 | XftResult result; |
| 252 | int charexists = 0, overflow = 0; |
| 253 | /* keep track of a couple codepoints for which we have no match. */ |
| 254 | enum { nomatches_len = 64 }; |
| 255 | static struct { long codepoint[nomatches_len]; unsigned int idx; } nomatches; |
| 256 | static unsigned int ellipsis_width = 0; |
| 257 | |
| 258 | if (!drw || (render && (!drw->scheme || !w)) || !text || !drw->fonts) |
| 259 | return 0; |
| 260 | |
| 261 | if (!render) { |
| 262 | w = invert ? invert : ~invert; |
| 263 | } else { |
| 264 | XSetForeground(drw->dpy, drw->gc, drw->scheme[invert ? ColFg : ColBg].pixel); |
| 265 | XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h); |
| 266 | d = XftDrawCreate(drw->dpy, drw->drawable, |
| 267 | DefaultVisual(drw->dpy, drw->screen), |
| 268 | DefaultColormap(drw->dpy, drw->screen)); |
| 269 | x += lpad; |
| 270 | w -= lpad; |
| 271 | } |
| 272 | |
| 273 | usedfont = drw->fonts; |
| 274 | if (!ellipsis_width && render) |
| 275 | ellipsis_width = drw_fontset_getwidth(drw, "..."); |
| 276 | while (1) { |
| 277 | ew = ellipsis_len = utf8strlen = 0; |
| 278 | utf8str = text; |
| 279 | nextfont = NULL; |
| 280 | while (*text) { |
| 281 | utf8charlen = utf8decode(text, &utf8codepoint, UTF_SIZ); |
| 282 | for (curfont = drw->fonts; curfont; curfont = curfont->next) { |
| 283 | charexists = charexists || XftCharExists(drw->dpy, curfont->xfont, utf8codepoint); |
| 284 | if (charexists) { |
| 285 | drw_font_getexts(curfont, text, utf8charlen, &tmpw, NULL); |
| 286 | if (ew + ellipsis_width <= w) { |
| 287 | /* keep track where the ellipsis still fits */ |
| 288 | ellipsis_x = x + ew; |
| 289 | ellipsis_w = w - ew; |
| 290 | ellipsis_len = utf8strlen; |
| 291 | } |
| 292 | |
| 293 | if (ew + tmpw > w) { |
| 294 | overflow = 1; |
| 295 | /* called from drw_fontset_getwidth_clamp(): |
| 296 | * it wants the width AFTER the overflow |
| 297 | */ |
| 298 | if (!render) |
| 299 | x += tmpw; |
| 300 | else |
| 301 | utf8strlen = ellipsis_len; |
| 302 | } else if (curfont == usedfont) { |
| 303 | utf8strlen += utf8charlen; |
| 304 | text += utf8charlen; |
| 305 | ew += tmpw; |
| 306 | } else { |
| 307 | nextfont = curfont; |
| 308 | } |
| 309 | break; |
| 310 | } |
| 311 | } |
| 312 | |
| 313 | if (overflow || !charexists || nextfont) |
| 314 | break; |
| 315 | else |
| 316 | charexists = 0; |
| 317 | } |
| 318 | |
| 319 | if (utf8strlen) { |
| 320 | if (render) { |
| 321 | ty = y + (h - usedfont->h) / 2 + usedfont->xfont->ascent; |
| 322 | XftDrawStringUtf8(d, &drw->scheme[invert ? ColBg : ColFg], |
| 323 | usedfont->xfont, x, ty, (XftChar8 *)utf8str, utf8strlen); |
| 324 | } |
| 325 | x += ew; |
| 326 | w -= ew; |
| 327 | } |
| 328 | if (render && overflow) |
| 329 | drw_text(drw, ellipsis_x, y, ellipsis_w, h, 0, "...", invert); |
| 330 | |
| 331 | if (!*text || overflow) { |
| 332 | break; |
| 333 | } else if (nextfont) { |
| 334 | charexists = 0; |
| 335 | usedfont = nextfont; |
| 336 | } else { |
| 337 | /* Regardless of whether or not a fallback font is found, the |
| 338 | * character must be drawn. */ |
| 339 | charexists = 1; |
| 340 | |
| 341 | for (i = 0; i < nomatches_len; ++i) { |
| 342 | /* avoid calling XftFontMatch if we know we won't find a match */ |
| 343 | if (utf8codepoint == nomatches.codepoint[i]) |
| 344 | goto no_match; |
| 345 | } |
| 346 | |
| 347 | fccharset = FcCharSetCreate(); |
| 348 | FcCharSetAddChar(fccharset, utf8codepoint); |
| 349 | |
| 350 | if (!drw->fonts->pattern) { |
| 351 | /* Refer to the comment in xfont_create for more information. */ |
| 352 | die("the first font in the cache must be loaded from a font string."); |
| 353 | } |
| 354 | |
| 355 | fcpattern = FcPatternDuplicate(drw->fonts->pattern); |
| 356 | FcPatternAddCharSet(fcpattern, FC_CHARSET, fccharset); |
| 357 | FcPatternAddBool(fcpattern, FC_SCALABLE, FcTrue); |
| 358 | |
| 359 | FcConfigSubstitute(NULL, fcpattern, FcMatchPattern); |
| 360 | FcDefaultSubstitute(fcpattern); |
| 361 | match = XftFontMatch(drw->dpy, drw->screen, fcpattern, &result); |
| 362 | |
| 363 | FcCharSetDestroy(fccharset); |
| 364 | FcPatternDestroy(fcpattern); |
| 365 | |
| 366 | if (match) { |
| 367 | usedfont = xfont_create(drw, NULL, match); |
| 368 | if (usedfont && XftCharExists(drw->dpy, usedfont->xfont, utf8codepoint)) { |
| 369 | for (curfont = drw->fonts; curfont->next; curfont = curfont->next) |
| 370 | ; /* NOP */ |
| 371 | curfont->next = usedfont; |
| 372 | } else { |
| 373 | xfont_free(usedfont); |
| 374 | nomatches.codepoint[++nomatches.idx % nomatches_len] = utf8codepoint; |
| 375 | no_match: |
| 376 | usedfont = drw->fonts; |
| 377 | } |
| 378 | } |
| 379 | } |
| 380 | } |
| 381 | if (d) |
| 382 | XftDrawDestroy(d); |
| 383 | |
| 384 | return x + (render ? w : 0); |
| 385 | } |
| 386 | |
| 387 | void |
| 388 | drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int h) |
| 389 | { |
| 390 | if (!drw) |
| 391 | return; |
| 392 | |
| 393 | XCopyArea(drw->dpy, drw->drawable, win, drw->gc, x, y, w, h, x, y); |
| 394 | XSync(drw->dpy, False); |
| 395 | } |
| 396 | |
| 397 | unsigned int |
| 398 | drw_fontset_getwidth(Drw *drw, const char *text) |
| 399 | { |
| 400 | if (!drw || !drw->fonts || !text) |
| 401 | return 0; |
| 402 | return drw_text(drw, 0, 0, 0, 0, 0, text, 0); |
| 403 | } |
| 404 | |
| 405 | unsigned int |
| 406 | drw_fontset_getwidth_clamp(Drw *drw, const char *text, unsigned int n) |
| 407 | { |
| 408 | unsigned int tmp = 0; |
| 409 | if (drw && drw->fonts && text && n) |
| 410 | tmp = drw_text(drw, 0, 0, 0, 0, 0, text, n); |
| 411 | return MIN(n, tmp); |
| 412 | } |
| 413 | |
| 414 | void |
| 415 | drw_font_getexts(Fnt *font, const char *text, unsigned int len, unsigned int *w, unsigned int *h) |
| 416 | { |
| 417 | XGlyphInfo ext; |
| 418 | |
| 419 | if (!font || !text) |
| 420 | return; |
| 421 | |
| 422 | XftTextExtentsUtf8(font->dpy, font->xfont, (XftChar8 *)text, len, &ext); |
| 423 | if (w) |
| 424 | *w = ext.xOff; |
| 425 | if (h) |
| 426 | *h = font->h; |
| 427 | } |
| 428 | |
| 429 | Cur * |
| 430 | drw_cur_create(Drw *drw, int shape) |
| 431 | { |
| 432 | Cur *cur; |
| 433 | |
| 434 | if (!drw || !(cur = ecalloc(1, sizeof(Cur)))) |
| 435 | return NULL; |
| 436 | |
| 437 | cur->cursor = XCreateFontCursor(drw->dpy, shape); |
| 438 | |
| 439 | return cur; |
| 440 | } |
| 441 | |
| 442 | void |
| 443 | drw_cur_free(Drw *drw, Cur *cursor) |
| 444 | { |
| 445 | if (!cursor) |
| 446 | return; |
| 447 | |
| 448 | XFreeCursor(drw->dpy, cursor->cursor); |
| 449 | free(cursor); |
| 450 | } |