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         if (!(drw = calloc(1, sizeof(Drw))))
  69                 return NULL;
  70         drw->dpy = dpy;
  71         drw->screen = screen;
  72         drw->root = root;
  73         drw->w = w;
  74         drw->h = h;
  75         drw->drawable = XCreatePixmap(dpy, root, w, h, DefaultDepth(dpy, screen));
  76         drw->gc = XCreateGC(dpy, root, 0, NULL);
  77         drw->fontcount = 0;
  78         XSetLineAttributes(dpy, drw->gc, 1, LineSolid, CapButt, JoinMiter);
  79
  80         return drw;
  81 }
  82
  83 void
  84 drw_resize(Drw *drw, unsigned int w, unsigned int h)
  85 {
  86         if (!drw)
  87                 return;
  88         drw->w = w;
  89         drw->h = h;
  90         if (drw->drawable)
  91                 XFreePixmap(drw->dpy, drw->drawable);
  92         drw->drawable = XCreatePixmap(drw->dpy, drw->root, w, h, DefaultDepth(drw->dpy, drw->screen));
  93 }
  94
  95 void
  96 drw_free(Drw *drw)
  97 {
  98         size_t i;
  99
 100         for (i = 0; i < drw->fontcount; i++)
 101                 drw_font_free(drw->fonts[i]);
 102         XFreePixmap(drw->dpy, drw->drawable);
 103         XFreeGC(drw->dpy, drw->gc);
 104         free(drw);
 105 }
 106
 107 /* This function is an implementation detail. Library users should use
 108  * drw_font_create instead.
 109  */
 110 static Fnt *
 111 drw_font_xcreate(Drw *drw, const char *fontname, FcPattern *fontpattern)
 112 {
 113         Fnt *font;
 114
 115         if (!(fontname || fontpattern))
 116                 die("No font specified.\n");
 117
 118         if (!(font = calloc(1, sizeof(Fnt))))
 119                 return NULL;
 120
 121         if (fontname) {
 122                 /* Using the pattern found at font->xfont->pattern does not yield same
 123                  * the same substitution results as using the pattern returned by
 124                  * FcNameParse; using the latter results in the desired fallback
 125                  * behaviour whereas the former just results in
 126                  * missing-character-rectangles being drawn, at least with some fonts.
 127                  */
 128                 if (!(font->xfont = XftFontOpenName(drw->dpy, drw->screen, fontname)) ||
 129                     !(font->pattern = FcNameParse((FcChar8 *) fontname))) {
 130                         if (font->xfont) {
 131                                 XftFontClose(drw->dpy, font->xfont);
 132                                 font->xfont = NULL;
 133                         }
 134                         fprintf(stderr, "error, cannot load font: '%s'\n", fontname);
 135                 }
 136         } else if (fontpattern) {
 137                 if (!(font->xfont = XftFontOpenPattern(drw->dpy, fontpattern)))
 138                         fprintf(stderr, "error, cannot load font pattern.\n");
 139                 else
 140                         font->pattern = NULL;
 141         }
 142
 143         if (!font->xfont) {
 144                 free(font);
 145                 return NULL;
 146         }
 147
 148         font->ascent = font->xfont->ascent;
 149         font->descent = font->xfont->descent;
 150         font->h = font->ascent + font->descent;
 151         font->dpy = drw->dpy;
 152
 153         return font;
 154 }
 155
 156 Fnt*
 157 drw_font_create(Drw *drw, const char *fontname)
 158 {
 159         return drw_font_xcreate(drw, fontname, NULL);
 160 }
 161
 162 void
 163 drw_load_fonts(Drw* drw, const char *fonts[], size_t fontcount)
 164 {
 165         size_t i;
 166         Fnt *font;
 167
 168         for (i = 0; i < fontcount; i++) {
 169                 if (drw->fontcount >= DRW_FONT_CACHE_SIZE) {
 170                         die("Font cache exhausted.\n");
 171                 } else if ((font = drw_font_xcreate(drw, fonts[i], NULL))) {
 172                         drw->fonts[drw->fontcount++] = font;
 173                 }
 174         }
 175 }
 176
 177 void
 178 drw_font_free(Fnt *font)
 179 {
 180         if (!font)
 181                 return;
 182         if (font->pattern)
 183                 FcPatternDestroy(font->pattern);
 184         XftFontClose(font->dpy, font->xfont);
 185         free(font);
 186 }
 187
 188 Clr *
 189 drw_clr_create(Drw *drw, const char *clrname)
 190 {
 191         Clr *clr;
 192         Colormap cmap;
 193         Visual *vis;
 194
 195         if (!drw)
 196                 return NULL;
 197         if (!(clr = calloc(1, sizeof(Clr))))
 198                 return NULL;
 199         cmap = DefaultColormap(drw->dpy, drw->screen);
 200         vis = DefaultVisual(drw->dpy, drw->screen);
 201         if (!XftColorAllocName(drw->dpy, vis, cmap, clrname, &clr->rgb))
 202                 die("error, cannot allocate color '%s'\n", clrname);
 203         clr->pix = clr->rgb.pixel;
 204
 205         return clr;
 206 }
 207
 208 void
 209 drw_clr_free(Clr *clr)
 210 {
 211         free(clr);
 212 }
 213
 214 void
 215 drw_setscheme(Drw *drw, ClrScheme *scheme)
 216 {
 217         if (!drw)
 218                 return;
 219         drw->scheme = scheme;
 220 }
 221
 222 void
 223 drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int filled, int empty, int invert)
 224 {
 225         if (!drw || !drw->scheme)
 226                 return;
 227         XSetForeground(drw->dpy, drw->gc, invert ? drw->scheme->bg->pix : drw->scheme->fg->pix);
 228         if (filled)
 229                 XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w + 1, h + 1);
 230         else if (empty)
 231                 XDrawRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
 232 }
 233
 234 int
 235 drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, const char *text, int invert)
 236 {
 237         char buf[1024];
 238         int tx, ty, th;
 239         Extnts tex;
 240         Colormap cmap;
 241         Visual *vis;
 242         XftDraw *d;
 243         Fnt *curfont, *nextfont;
 244         size_t i, len;
 245         int utf8strlen, utf8charlen, render;
 246         long utf8codepoint = 0;
 247         const char *utf8str;
 248         FcCharSet *fccharset;
 249         FcPattern *fcpattern;
 250         FcPattern *match;
 251         XftResult result;
 252         int charexists = 0;
 253
 254         if (!(render = x || y || w || h))
 255                 w = ~w;
 256
 257         if (!drw || !drw->scheme) {
 258                 return 0;
 259         } else if (render) {
 260                 XSetForeground(drw->dpy, drw->gc, invert ? drw->scheme->fg->pix : drw->scheme->bg->pix);
 261                 XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
 262         }
 263
 264         if (!text || !drw->fontcount) {
 265                 return 0;
 266         } else if (render) {
 267                 cmap = DefaultColormap(drw->dpy, drw->screen);
 268                 vis = DefaultVisual(drw->dpy, drw->screen);
 269                 d = XftDrawCreate(drw->dpy, drw->drawable, vis, cmap);
 270         }
 271
 272         curfont = drw->fonts[0];
 273         while (1) {
 274                 utf8strlen = 0;
 275                 utf8str = text;
 276                 nextfont = NULL;
 277                 while (*text) {
 278                         utf8charlen = utf8decode(text, &utf8codepoint, UTF_SIZ);
 279                         for (i = 0; i < drw->fontcount; i++) {
 280                                 charexists = charexists || XftCharExists(drw->dpy, drw->fonts[i]->xfont, utf8codepoint);
 281                                 if (charexists) {
 282                                         if (drw->fonts[i] == curfont) {
 283                                                 utf8strlen += utf8charlen;
 284                                                 text += utf8charlen;
 285                                         } else {
 286                                                 nextfont = drw->fonts[i];
 287                                         }
 288                                         break;
 289                                 }
 290                         }
 291
 292                         if (!charexists || (nextfont && nextfont != curfont))
 293                                 break;
 294                         else
 295                                 charexists = 0;
 296                 }
 297
 298                 if (utf8strlen) {
 299                         drw_font_getexts(curfont, utf8str, utf8strlen, &tex);
 300                         /* shorten text if necessary */
 301                         for (len = MIN(utf8strlen, (sizeof buf) - 1); len && (tex.w > w - drw->fonts[0]->h || w < drw->fonts[0]->h); len--)
 302                                 drw_font_getexts(curfont, utf8str, len, &tex);
 303
 304                         if (len) {
 305                                 memcpy(buf, utf8str, len);
 306                                 buf[len] = '\0';
 307                                 if (len < utf8strlen)
 308                                         for (i = len; i && i > len - 3; buf[--i] = '.');
 309
 310                                 if (render) {
 311                                         th = curfont->ascent + curfont->descent;
 312                                         ty = y + (h / 2) - (th / 2) + curfont->ascent;
 313                                         tx = x + (h / 2);
 314                                         XftDrawStringUtf8(d, invert ? &drw->scheme->bg->rgb : &drw->scheme->fg->rgb, curfont->xfont, tx, ty, (XftChar8 *)buf, len);
 315                                 }
 316                                 x += tex.w;
 317                                 w -= tex.w;
 318                         }
 319                 }
 320
 321                 if (!*text) {
 322                         break;
 323                 } else if (nextfont) {
 324                         charexists = 0;
 325                         curfont = nextfont;
 326                 } else {
 327                         /* Regardless of whether or not a fallback font is found, the
 328                          * character must be drawn.
 329                          */
 330                         charexists = 1;
 331
 332                         if (drw->fontcount >= DRW_FONT_CACHE_SIZE)
 333                                 continue;
 334
 335                         fccharset = FcCharSetCreate();
 336                         FcCharSetAddChar(fccharset, utf8codepoint);
 337
 338                         if (!drw->fonts[0]->pattern) {
 339                                 /* Refer to the comment in drw_font_xcreate for more
 340                                  * information. */
 341                                 die("The first font in the cache must be loaded from a font string.\n");
 342                         }
 343
 344                         fcpattern = FcPatternDuplicate(drw->fonts[0]->pattern);
 345                         FcPatternAddCharSet(fcpattern, FC_CHARSET, fccharset);
 346                         FcPatternAddBool(fcpattern, FC_SCALABLE, FcTrue);
 347
 348                         FcConfigSubstitute(NULL, fcpattern, FcMatchPattern);
 349                         FcDefaultSubstitute(fcpattern);
 350                         match = XftFontMatch(drw->dpy, drw->screen, fcpattern, &result);
 351
 352                         FcCharSetDestroy(fccharset);
 353                         FcPatternDestroy(fcpattern);
 354
 355                         if (match) {
 356                                 curfont = drw_font_xcreate(drw, NULL, match);
 357                                 if (curfont && XftCharExists(drw->dpy, curfont->xfont, utf8codepoint)) {
 358                                         drw->fonts[drw->fontcount++] = curfont;
 359                                 } else {
 360                                         if (curfont)
 361                                                 drw_font_free(curfont);
 362                                         curfont = drw->fonts[0];
 363                                 }
 364                         }
 365                 }
 366         }
 367         if (render)
 368                 XftDrawDestroy(d);
 369
 370         return x;
 371 }
 372
 373 void
 374 drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int h)
 375 {
 376         if (!drw)
 377                 return;
 378         XCopyArea(drw->dpy, drw->drawable, win, drw->gc, x, y, w, h, x, y);
 379         XSync(drw->dpy, False);
 380 }
 381
 382 void
 383 drw_font_getexts(Fnt *font, const char *text, unsigned int len, Extnts *tex)
 384 {
 385         XGlyphInfo ext;
 386
 387         if (!font || !text)
 388                 return;
 389         XftTextExtentsUtf8(font->dpy, font->xfont, (XftChar8 *)text, len, &ext);
 390         tex->h = font->h;
 391         tex->w = ext.xOff;
 392 }
 393
 394 unsigned int
 395 drw_font_getexts_width(Fnt *font, const char *text, unsigned int len)
 396 {
 397         Extnts tex;
 398
 399         if (!font)
 400                 return -1;
 401         drw_font_getexts(font, text, len, &tex);
 402         return tex.w;
 403 }
 404
 405 Cur *
 406 drw_cur_create(Drw *drw, int shape)
 407 {
 408         Cur *cur;
 409
 410         if (!drw)
 411                 return NULL;
 412         if (!(cur = calloc(1, sizeof(Cur))))
 413                 return NULL;
 414         cur->cursor = XCreateFontCursor(drw->dpy, shape);
 415
 416         return cur;
 417 }
 418
 419 void
 420 drw_cur_free(Drw *drw, Cur *cursor)
 421 {
 422         if (!drw || !cursor)
 423                 return;
 424         XFreeCursor(drw->dpy, cursor->cursor);
 425         free(cursor);
 426 }