drw.c

   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;
  67
  68         drw = ecalloc(1, sizeof(Drw));
  69         drw->dpy = dpy;
  70         drw->screen = screen;
  71         drw->root = root;
  72         drw->w = w;
  73         drw->h = h;
  74         drw->drawable = XCreatePixmap(dpy, root, w, h, DefaultDepth(dpy, screen));
  75         drw->gc = XCreateGC(dpy, root, 0, NULL);
  76         drw->fontcount = 0;
  77         XSetLineAttributes(dpy, drw->gc, 1, LineSolid, CapButt, JoinMiter);
  78
  79         return drw;
  80 }
  81
  82 void
  83 drw_resize(Drw *drw, unsigned int w, unsigned int h)
  84 {
  85         if (!drw)
  86                 return;
  87         drw->w = w;
  88         drw->h = h;
  89         if (drw->drawable)
  90                 XFreePixmap(drw->dpy, drw->drawable);
  91         drw->drawable = XCreatePixmap(drw->dpy, drw->root, w, h, DefaultDepth(drw->dpy, drw->screen));
  92 }
  93
  94 void
  95 drw_free(Drw *drw)
  96 {
  97         size_t i;
  98
  99         for (i = 0; i < drw->fontcount; i++)
 100                 drw_font_free(drw->fonts[i]);
 101         XFreePixmap(drw->dpy, drw->drawable);
 102         XFreeGC(drw->dpy, drw->gc);
 103         free(drw);
 104 }
 105
 106 /* This function is an implementation detail. Library users should use
 107  * drw_font_create instead.
 108  */
 109 static Fnt *
 110 drw_font_xcreate(Drw *drw, const char *fontname, FcPattern *fontpattern)
 111 {
 112         Fnt *font;
 113
 114         if (!(fontname || fontpattern))
 115                 die("No font specified.\n");
 116
 117         if (!(font = calloc(1, sizeof(Fnt))))
 118                 return NULL;
 119
 120         if (fontname) {
 121                 /* Using the pattern found at font->xfont->pattern does not yield same
 122                  * the same substitution results as using the pattern returned by
 123                  * FcNameParse; using the latter results in the desired fallback
 124                  * behaviour whereas the former just results in
 125                  * missing-character-rectangles being drawn, at least with some fonts.
 126                  */
 127                 if (!(font->xfont = XftFontOpenName(drw->dpy, drw->screen, fontname)) ||
 128                     !(font->pattern = FcNameParse((FcChar8 *) fontname))) {
 129                         if (font->xfont) {
 130                                 XftFontClose(drw->dpy, font->xfont);
 131                                 font->xfont = NULL;
 132                         }
 133                         fprintf(stderr, "error, cannot load font: '%s'\n", fontname);
 134                 }
 135         } else if (fontpattern) {
 136                 if (!(font->xfont = XftFontOpenPattern(drw->dpy, fontpattern)))
 137                         fprintf(stderr, "error, cannot load font pattern.\n");
 138                 else
 139                         font->pattern = NULL;
 140         }
 141
 142         if (!font->xfont) {
 143                 free(font);
 144                 return NULL;
 145         }
 146
 147         font->ascent = font->xfont->ascent;
 148         font->descent = font->xfont->descent;
 149         font->h = font->ascent + font->descent;
 150         font->dpy = drw->dpy;
 151
 152         return font;
 153 }
 154
 155 Fnt*
 156 drw_font_create(Drw *drw, const char *fontname)
 157 {
 158         return drw_font_xcreate(drw, fontname, NULL);
 159 }
 160
 161 void
 162 drw_load_fonts(Drw* drw, const char *fonts[], size_t fontcount)
 163 {
 164         size_t i;
 165         Fnt *font;
 166
 167         for (i = 0; i < fontcount; i++) {
 168                 if (drw->fontcount >= DRW_FONT_CACHE_SIZE) {
 169                         die("Font cache exhausted.\n");
 170                 } else if ((font = drw_font_xcreate(drw, fonts[i], NULL))) {
 171                         drw->fonts[drw->fontcount++] = font;
 172                 }
 173         }
 174 }
 175
 176 void
 177 drw_font_free(Fnt *font)
 178 {
 179         if (!font)
 180                 return;
 181         if (font->pattern)
 182                 FcPatternDestroy(font->pattern);
 183         XftFontClose(font->dpy, font->xfont);
 184         free(font);
 185 }
 186
 187 Clr *
 188 drw_clr_create(Drw *drw, const char *clrname)
 189 {
 190         Clr *clr;
 191         if (!drw)
 192                 return NULL;
 193
 194         clr = ecalloc(1, sizeof(Clr));
 195         if (!XftColorAllocName(drw->dpy, DefaultVisual(drw->dpy, drw->screen),
 196                                DefaultColormap(drw->dpy, drw->screen),
 197                                clrname, &clr->rgb))
 198                 die("error, cannot allocate color '%s'\n", clrname);
 199         clr->pix = clr->rgb.pixel;
 200
 201         return clr;
 202 }
 203
 204 void
 205 drw_clr_free(Clr *clr)
 206 {
 207         free(clr);
 208 }
 209
 210 void
 211 drw_setscheme(Drw *drw, ClrScheme *scheme)
 212 {
 213         if (!drw)
 214                 return;
 215         drw->scheme = scheme;
 216 }
 217
 218 void
 219 drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int filled, int empty, int invert)
 220 {
 221         if (!drw || !drw->scheme)
 222                 return;
 223         XSetForeground(drw->dpy, drw->gc, invert ? drw->scheme->bg->pix : drw->scheme->fg->pix);
 224         if (filled)
 225                 XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w + 1, h + 1);
 226         else if (empty)
 227                 XDrawRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
 228 }
 229
 230 int
 231 drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, const char *text, int invert)
 232 {
 233         char buf[1024];
 234         int tx, ty, th;
 235         Extnts tex;
 236         Colormap cmap;
 237         Visual *vis;
 238         XftDraw *d;
 239         Fnt *curfont, *nextfont;
 240         size_t i, len;
 241         int utf8strlen, utf8charlen, render;
 242         long utf8codepoint = 0;
 243         const char *utf8str;
 244         FcCharSet *fccharset;
 245         FcPattern *fcpattern;
 246         FcPattern *match;
 247         XftResult result;
 248         int charexists = 0;
 249
 250         if (!(render = x || y || w || h))
 251                 w = ~w;
 252
 253         if (!drw || !drw->scheme) {
 254                 return 0;
 255         } else if (render) {
 256                 XSetForeground(drw->dpy, drw->gc, invert ? drw->scheme->fg->pix : drw->scheme->bg->pix);
 257                 XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
 258         }
 259
 260         if (!text || !drw->fontcount) {
 261                 return 0;
 262         } else if (render) {
 263                 cmap = DefaultColormap(drw->dpy, drw->screen);
 264                 vis = DefaultVisual(drw->dpy, drw->screen);
 265                 d = XftDrawCreate(drw->dpy, drw->drawable, vis, cmap);
 266         }
 267
 268         curfont = drw->fonts[0];
 269         while (1) {
 270                 utf8strlen = 0;
 271                 utf8str = text;
 272                 nextfont = NULL;
 273                 while (*text) {
 274                         utf8charlen = utf8decode(text, &utf8codepoint, UTF_SIZ);
 275                         for (i = 0; i < drw->fontcount; i++) {
 276                                 charexists = charexists || XftCharExists(drw->dpy, drw->fonts[i]->xfont, utf8codepoint);
 277                                 if (charexists) {
 278                                         if (drw->fonts[i] == curfont) {
 279                                                 utf8strlen += utf8charlen;
 280                                                 text += utf8charlen;
 281                                         } else {
 282                                                 nextfont = drw->fonts[i];
 283                                         }
 284                                         break;
 285                                 }
 286                         }
 287
 288                         if (!charexists || (nextfont && nextfont != curfont))
 289                                 break;
 290                         else
 291                                 charexists = 0;
 292                 }
 293
 294                 if (utf8strlen) {
 295                         drw_font_getexts(curfont, utf8str, utf8strlen, &tex);
 296                         /* shorten text if necessary */
 297                         for (len = MIN(utf8strlen, (sizeof buf) - 1); len && (tex.w > w - drw->fonts[0]->h || w < drw->fonts[0]->h); len--)
 298                                 drw_font_getexts(curfont, utf8str, len, &tex);
 299
 300                         if (len) {
 301                                 memcpy(buf, utf8str, len);
 302                                 buf[len] = '\0';
 303                                 if (len < utf8strlen)
 304                                         for (i = len; i && i > len - 3; buf[--i] = '.');
 305
 306                                 if (render) {
 307                                         th = curfont->ascent + curfont->descent;
 308                                         ty = y + (h / 2) - (th / 2) + curfont->ascent;
 309                                         tx = x + (h / 2);
 310                                         XftDrawStringUtf8(d, invert ? &drw->scheme->bg->rgb : &drw->scheme->fg->rgb, curfont->xfont, tx, ty, (XftChar8 *)buf, len);
 311                                 }
 312                                 x += tex.w;
 313                                 w -= tex.w;
 314                         }
 315                 }
 316
 317                 if (!*text) {
 318                         break;
 319                 } else if (nextfont) {
 320                         charexists = 0;
 321                         curfont = nextfont;
 322                 } else {
 323                         /* Regardless of whether or not a fallback font is found, the
 324                          * character must be drawn.
 325                          */
 326                         charexists = 1;
 327
 328                         if (drw->fontcount >= DRW_FONT_CACHE_SIZE)
 329                                 continue;
 330
 331                         fccharset = FcCharSetCreate();
 332                         FcCharSetAddChar(fccharset, utf8codepoint);
 333
 334                         if (!drw->fonts[0]->pattern) {
 335                                 /* Refer to the comment in drw_font_xcreate for more
 336                                  * information. */
 337                                 die("The first font in the cache must be loaded from a font string.\n");
 338                         }
 339
 340                         fcpattern = FcPatternDuplicate(drw->fonts[0]->pattern);
 341                         FcPatternAddCharSet(fcpattern, FC_CHARSET, fccharset);
 342                         FcPatternAddBool(fcpattern, FC_SCALABLE, FcTrue);
 343
 344                         FcConfigSubstitute(NULL, fcpattern, FcMatchPattern);
 345                         FcDefaultSubstitute(fcpattern);
 346                         match = XftFontMatch(drw->dpy, drw->screen, fcpattern, &result);
 347
 348                         FcCharSetDestroy(fccharset);
 349                         FcPatternDestroy(fcpattern);
 350
 351                         if (match) {
 352                                 curfont = drw_font_xcreate(drw, NULL, match);
 353                                 if (curfont && XftCharExists(drw->dpy, curfont->xfont, utf8codepoint)) {
 354                                         drw->fonts[drw->fontcount++] = curfont;
 355                                 } else {
 356                                         if (curfont)
 357                                                 drw_font_free(curfont);
 358                                         curfont = drw->fonts[0];
 359                                 }
 360                         }
 361                 }
 362         }
 363         if (render)
 364                 XftDrawDestroy(d);
 365
 366         return x;
 367 }
 368
 369 void
 370 drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int h)
 371 {
 372         if (!drw)
 373                 return;
 374         XCopyArea(drw->dpy, drw->drawable, win, drw->gc, x, y, w, h, x, y);
 375         XSync(drw->dpy, False);
 376 }
 377
 378 void
 379 drw_font_getexts(Fnt *font, const char *text, unsigned int len, Extnts *tex)
 380 {
 381         XGlyphInfo ext;
 382
 383         if (!font || !text)
 384                 return;
 385         XftTextExtentsUtf8(font->dpy, font->xfont, (XftChar8 *)text, len, &ext);
 386         tex->h = font->h;
 387         tex->w = ext.xOff;
 388 }
 389
 390 unsigned int
 391 drw_font_getexts_width(Fnt *font, const char *text, unsigned int len)
 392 {
 393         Extnts tex;
 394
 395         if (!font)
 396                 return -1;
 397         drw_font_getexts(font, text, len, &tex);
 398         return tex.w;
 399 }
 400
 401 Cur *
 402 drw_cur_create(Drw *drw, int shape)
 403 {
 404         Cur *cur;
 405
 406         if (!drw)
 407                 return NULL;
 408         cur = ecalloc(1, sizeof(Cur));
 409         cur->cursor = XCreateFontCursor(drw->dpy, shape);
 410
 411         return cur;
 412 }
 413
 414 void
 415 drw_cur_free(Drw *drw, Cur *cursor)
 416 {
 417         if (!drw || !cursor)
 418                 return;
 419         XFreeCursor(drw->dpy, cursor->cursor);
 420         free(cursor);
 421 }