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