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