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         for(*i = 0; *i < (UTF_SIZ + 1); ++(*i))
  22                 if(((unsigned char)c & utfmask[*i]) == utfbyte[*i])
  23                         return (unsigned char)c & ~utfmask[*i];
  24         return 0;
  25 }
  26
  27 static size_t
  28 utf8validate(long *u, size_t i) {
  29         if(!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
  30                 *u = UTF_INVALID;
  31         for(i = 1; *u > utfmax[i]; ++i)
  32                 ;
  33         return i;
  34 }
  35
  36 static size_t
  37 utf8decode(const char *c, long *u, size_t clen) {
  38         size_t i, j, len, type;
  39         long udecoded;
  40
  41         *u = UTF_INVALID;
  42         if(!clen)
  43                 return 0;
  44         udecoded = utf8decodebyte(c[0], &len);
  45         if(!BETWEEN(len, 1, UTF_SIZ))
  46                 return 1;
  47         for(i = 1, j = 1; i < clen && j < len; ++i, ++j) {
  48                 udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
  49                 if(type != 0)
  50                         return j;
  51         }
  52         if(j < len)
  53                 return 0;
  54         *u = udecoded;
  55         utf8validate(u, len);
  56         return len;
  57 }
  58
  59 Drw *
  60 drw_create(Display *dpy, int screen, Window root, unsigned int w, unsigned int h) {
  61         Drw *drw = (Drw *)calloc(1, sizeof(Drw));
  62         if(!drw)
  63                 return NULL;
  64         drw->dpy = dpy;
  65         drw->screen = screen;
  66         drw->root = root;
  67         drw->w = w;
  68         drw->h = h;
  69         drw->drawable = XCreatePixmap(dpy, root, w, h, DefaultDepth(dpy, screen));
  70         drw->gc = XCreateGC(dpy, root, 0, NULL);
  71         drw->fontcount = 0;
  72         XSetLineAttributes(dpy, drw->gc, 1, LineSolid, CapButt, JoinMiter);
  73         return drw;
  74 }
  75
  76 void
  77 drw_resize(Drw *drw, unsigned int w, unsigned int h) {
  78         if(!drw)
  79                 return;
  80         drw->w = w;
  81         drw->h = h;
  82         if(drw->drawable != 0)
  83                 XFreePixmap(drw->dpy, drw->drawable);
  84         drw->drawable = XCreatePixmap(drw->dpy, drw->root, w, h, DefaultDepth(drw->dpy, drw->screen));
  85 }
  86
  87 void
  88 drw_free(Drw *drw) {
  89         size_t i;
  90
  91         for (i = 0; i < drw->fontcount; i++) {
  92                 drw_font_free(drw->fonts[i]);
  93         }
  94         XFreePixmap(drw->dpy, drw->drawable);
  95         XFreeGC(drw->dpy, drw->gc);
  96         free(drw);
  97 }
  98
  99 /* This function is an implementation detail. Library users should use
 100  * drw_font_create instead.
 101  */
 102 static Fnt *
 103 drw_font_xcreate(Drw *drw, const char *fontname, FcPattern *fontpattern) {
 104         Fnt *font;
 105
 106         if (!(fontname || fontpattern))
 107                 die("No font specified.\n");
 108
 109         if (!(font = (Fnt *)calloc(1, sizeof(Fnt))))
 110                 return NULL;
 111
 112         if (fontname) {
 113                 /* Using the pattern found at font->xfont->pattern does not yield same
 114                  * the 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
 117                  * missing-character-rectangles being drawn, at least with some fonts.
 118                  */
 119                 if (!(font->xfont = XftFontOpenName(drw->dpy, drw->screen, fontname)) ||
 120                     !(font->pattern = FcNameParse((FcChar8 *) fontname))) {
 121                         if (font->xfont) {
 122                                 XftFontClose(drw->dpy, font->xfont);
 123                                 font->xfont = NULL;
 124                         }
 125                         fprintf(stderr, "error, cannot load font: '%s'\n", fontname);
 126                 }
 127         } else if (fontpattern) {
 128                 if (!(font->xfont = XftFontOpenPattern(drw->dpy, fontpattern))) {
 129                         fprintf(stderr, "error, cannot load font pattern.\n");
 130                 } else {
 131                         font->pattern = NULL;
 132                 }
 133         }
 134
 135         if (!font->xfont) {
 136                 free(font);
 137                 return NULL;
 138         }
 139
 140         font->ascent = font->xfont->ascent;
 141         font->descent = font->xfont->descent;
 142         font->h = font->ascent + font->descent;
 143         font->dpy = drw->dpy;
 144         return font;
 145 }
 146
 147 Fnt*
 148 drw_font_create(Drw *drw, const char *fontname) {
 149         return drw_font_xcreate(drw, fontname, NULL);
 150 }
 151
 152 void
 153 drw_load_fonts(Drw* drw, const char *fonts[], size_t fontcount) {
 154         size_t i;
 155         Fnt *font;
 156
 157         for (i = 0; i < fontcount; i++) {
 158                 if (drw->fontcount >= DRW_FONT_CACHE_SIZE) {
 159                         die("Font cache exhausted.\n");
 160                 } else if ((font = drw_font_xcreate(drw, fonts[i], NULL))) {
 161                         drw->fonts[drw->fontcount++] = font;
 162                 }
 163         }
 164 }
 165
 166 void
 167 drw_font_free(Fnt *font) {
 168         if(!font)
 169                 return;
 170         if(font->pattern)
 171                 FcPatternDestroy(font->pattern);
 172         XftFontClose(font->dpy, font->xfont);
 173         free(font);
 174 }
 175
 176 Clr *
 177 drw_clr_create(Drw *drw, const char *clrname) {
 178         Clr *clr;
 179         Colormap cmap;
 180         Visual *vis;
 181
 182         if(!drw)
 183                 return NULL;
 184         clr = (Clr *)calloc(1, sizeof(Clr));
 185         if(!clr)
 186                 return NULL;
 187         cmap = DefaultColormap(drw->dpy, drw->screen);
 188         vis = DefaultVisual(drw->dpy, drw->screen);
 189         if(!XftColorAllocName(drw->dpy, vis, cmap, clrname, &clr->rgb))
 190                 die("error, cannot allocate color '%s'\n", clrname);
 191         clr->pix = clr->rgb.pixel;
 192         return clr;
 193 }
 194
 195 void
 196 drw_clr_free(Clr *clr) {
 197         free(clr);
 198 }
 199
 200 void
 201 drw_setscheme(Drw *drw, ClrScheme *scheme) {
 202         if(!drw)
 203                 return;
 204         drw->scheme = scheme;
 205 }
 206
 207 void
 208 drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int filled, int empty, int invert) {
 209         if(!drw || !drw->scheme)
 210                 return;
 211         XSetForeground(drw->dpy, drw->gc, invert ? drw->scheme->bg->pix : drw->scheme->fg->pix);
 212         if(filled)
 213                 XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w + 1, h + 1);
 214         else if(empty)
 215                 XDrawRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
 216 }
 217
 218 int
 219 drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, const char *text, int invert) {
 220         char buf[1024];
 221         int tx, ty, th;
 222         Extnts tex;
 223         Colormap cmap;
 224         Visual *vis;
 225         XftDraw *d;
 226         Fnt *curfont, *nextfont;
 227         size_t i, len;
 228         int utf8strlen, utf8charlen, render;
 229         long utf8codepoint = 0;
 230         const char *utf8str;
 231         FcCharSet *fccharset;
 232         FcPattern *fcpattern;
 233         FcPattern *match;
 234         XftResult result;
 235         int charexists = 0;
 236
 237         if (!(render = x || y || w || h)) {
 238                 w = ~w;
 239         }
 240
 241         if (!drw || !drw->scheme) {
 242                 return 0;
 243         } else if (render) {
 244                 XSetForeground(drw->dpy, drw->gc, invert ? drw->scheme->fg->pix : drw->scheme->bg->pix);
 245                 XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
 246         }
 247
 248         if (!text || !drw->fontcount) {
 249                 return 0;
 250         } else if (render) {
 251                 cmap = DefaultColormap(drw->dpy, drw->screen);
 252                 vis = DefaultVisual(drw->dpy, drw->screen);
 253                 d = XftDrawCreate(drw->dpy, drw->drawable, vis, cmap);
 254         }
 255
 256         curfont = drw->fonts[0];
 257         while (1) {
 258                 utf8strlen = 0;
 259                 utf8str = text;
 260                 nextfont = NULL;
 261                 while (*text) {
 262                         utf8charlen = utf8decode(text, &utf8codepoint, UTF_SIZ);
 263                         for (i = 0; i < drw->fontcount; i++) {
 264                                 charexists = charexists || XftCharExists(drw->dpy, drw->fonts[i]->xfont, utf8codepoint);
 265                                 if (charexists) {
 266                                         if (drw->fonts[i] == curfont) {
 267                                                 utf8strlen += utf8charlen;
 268                                                 text += utf8charlen;
 269                                         } else {
 270                                                 nextfont = drw->fonts[i];
 271                                         }
 272                                         break;
 273                                 }
 274                         }
 275
 276                         if (!charexists || (nextfont && nextfont != curfont)) {
 277                                 break;
 278                         } else {
 279                                 charexists = 0;
 280                         }
 281                 }
 282
 283                 if (utf8strlen) {
 284                         drw_font_getexts(curfont, utf8str, utf8strlen, &tex);
 285                         /* shorten text if necessary */
 286                         for(len = MIN(utf8strlen, (sizeof buf) - 1); len && (tex.w > w - drw->fonts[0]->h || w < drw->fonts[0]->h); len--)
 287                                 drw_font_getexts(curfont, utf8str, len, &tex);
 288
 289                         if (len) {
 290                                 memcpy(buf, utf8str, len);
 291                                 buf[len] = '\0';
 292                                 if(len < utf8strlen)
 293                                         for(i = len; i && i > len - 3; buf[--i] = '.');
 294
 295                                 if (render) {
 296                                         th = curfont->ascent + curfont->descent;
 297                                         ty = y + (h / 2) - (th / 2) + curfont->ascent;
 298                                         tx = x + (h / 2);
 299                                         XftDrawStringUtf8(d, invert ? &drw->scheme->bg->rgb : &drw->scheme->fg->rgb, curfont->xfont, tx, ty, (XftChar8 *)buf, len);
 300                                 }
 301
 302                                 x += tex.w;
 303                                 w -= tex.w;
 304                         }
 305                 }
 306
 307                 if (!*text) {
 308                         break;
 309                 } else if (nextfont) {
 310                         charexists = 0;
 311                         curfont = nextfont;
 312                 } else {
 313                         /* Regardless of whether or not a fallback font is found, the
 314                          * character must be drawn.
 315                          */
 316                         charexists = 1;
 317
 318                         if (drw->fontcount >= DRW_FONT_CACHE_SIZE) {
 319                                 continue;
 320                         }
 321
 322                         fccharset = FcCharSetCreate();
 323                         FcCharSetAddChar(fccharset, utf8codepoint);
 324
 325                         if (!drw->fonts[0]->pattern) {
 326                                 /* Refer to the comment in drw_font_xcreate for more
 327                                  * information.
 328                                  */
 329                                 die("The first font in the cache must be loaded from a font string.\n");
 330                         }
 331
 332                         fcpattern = FcPatternDuplicate(drw->fonts[0]->pattern);
 333                         FcPatternAddCharSet(fcpattern, FC_CHARSET, fccharset);
 334                         FcPatternAddBool(fcpattern, FC_SCALABLE, FcTrue);
 335
 336                         FcConfigSubstitute(NULL, fcpattern, FcMatchPattern);
 337                         FcDefaultSubstitute(fcpattern);
 338                         match = XftFontMatch(drw->dpy, drw->screen, fcpattern, &result);
 339
 340                         FcCharSetDestroy(fccharset);
 341                         FcPatternDestroy(fcpattern);
 342
 343                         if (match) {
 344                                 curfont = drw_font_xcreate(drw, NULL, match);
 345                                 if (curfont && XftCharExists(drw->dpy, curfont->xfont, utf8codepoint)) {
 346                                         drw->fonts[drw->fontcount++] = curfont;
 347                                 } else {
 348                                         if (curfont) {
 349                                                 drw_font_free(curfont);
 350                                         }
 351                                         curfont = drw->fonts[0];
 352                                 }
 353                         }
 354                 }
 355         }
 356
 357         if (render) {
 358                 XftDrawDestroy(d);
 359         }
 360
 361         return x;
 362 }
 363
 364 void
 365 drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int h) {
 366         if(!drw)
 367                 return;
 368         XCopyArea(drw->dpy, drw->drawable, win, drw->gc, x, y, w, h, x, y);
 369         XSync(drw->dpy, False);
 370 }
 371
 372
 373 void
 374 drw_font_getexts(Fnt *font, const char *text, unsigned int len, Extnts *tex) {
 375         XGlyphInfo ext;
 376
 377         if(!font || !text)
 378                 return;
 379         XftTextExtentsUtf8(font->dpy, font->xfont, (XftChar8 *)text, len, &ext);
 380         tex->h = font->h;
 381         tex->w = ext.xOff;
 382 }
 383
 384 unsigned int
 385 drw_font_getexts_width(Fnt *font, const char *text, unsigned int len) {
 386         Extnts tex;
 387
 388         if(!font)
 389                 return -1;
 390         drw_font_getexts(font, text, len, &tex);
 391         return tex.w;
 392 }
 393
 394 Cur *
 395 drw_cur_create(Drw *drw, int shape) {
 396         Cur *cur;
 397
 398         if(!drw)
 399                 return NULL;
 400         cur = (Cur *)calloc(1, sizeof(Cur));
 401         if (!cur)
 402                 return NULL;
 403         cur->cursor = XCreateFontCursor(drw->dpy, shape);
 404         return cur;
 405 }
 406
 407 void
 408 drw_cur_free(Drw *drw, Cur *cursor) {
 409         if(!drw || !cursor)
 410                 return;
 411         XFreeCursor(drw->dpy, cursor->cursor);
 412         free(cursor);
 413 }