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, Visual *visual, unsigned int depth, Colormap cmap)
  65 {
  66         Drw *drw = ecalloc(1, sizeof(Drw));
  67
  68         drw->dpy = dpy;
  69         drw->screen = screen;
  70         drw->root = root;
  71         drw->w = w;
  72         drw->h = h;
  73         drw->visual = visual;
  74         drw->depth = depth;
  75         drw->cmap = cmap;
  76         drw->drawable = XCreatePixmap(dpy, root, w, h, depth);
  77         drw->gc = XCreateGC(dpy, drw->drawable, 0, NULL);
  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
  89         drw->w = w;
  90         drw->h = h;
  91         if (drw->drawable)
  92                 XFreePixmap(drw->dpy, drw->drawable);
  93         drw->drawable = XCreatePixmap(drw->dpy, drw->root, w, h, drw->depth);
  94 }
  95
  96 void
  97 drw_free(Drw *drw)
  98 {
  99         XFreePixmap(drw->dpy, drw->drawable);
 100         XFreeGC(drw->dpy, drw->gc);
 101         drw_fontset_free(drw->fonts);
 102         free(drw);
 103 }
 104
 105 /* This function is an implementation detail. Library users should use
 106  * drw_fontset_create instead.
 107  */
 108 static Fnt *
 109 xfont_create(Drw *drw, const char *fontname, FcPattern *fontpattern)
 110 {
 111         Fnt *font;
 112         XftFont *xfont = NULL;
 113         FcPattern *pattern = NULL;
 114
 115         if (fontname) {
 116                 /* Using the pattern found at font->xfont->pattern does not yield the
 117                  * same substitution results as using the pattern returned by
 118                  * FcNameParse; using the latter results in the desired fallback
 119                  * behaviour whereas the former just results in missing-character
 120                  * rectangles being drawn, at least with some fonts. */
 121                 if (!(xfont = XftFontOpenName(drw->dpy, drw->screen, fontname))) {
 122                         fprintf(stderr, "error, cannot load font from name: '%s'\n", fontname);
 123                         return NULL;
 124                 }
 125                 if (!(pattern = FcNameParse((FcChar8 *) fontname))) {
 126                         fprintf(stderr, "error, cannot parse font name to pattern: '%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 from pattern.\n");
 133                         return NULL;
 134                 }
 135         } else {
 136                 die("no font specified.");
 137         }
 138
 139         /* Do not allow using color fonts. This is a workaround for a BadLength
 140          * error from Xft with color glyphs. Modelled on the Xterm workaround. See
 141          * https://bugzilla.redhat.com/show_bug.cgi?id=1498269
 142          * https://lists.suckless.org/dev/1701/30932.html
 143          * https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=916349
 144          * and lots more all over the internet.
 145          */
 146         FcBool iscol;
 147         if(FcPatternGetBool(xfont->pattern, FC_COLOR, 0, &iscol) == FcResultMatch && iscol) {
 148                 XftFontClose(drw->dpy, xfont);
 149                 return NULL;
 150         }
 151
 152         font = ecalloc(1, sizeof(Fnt));
 153         font->xfont = xfont;
 154         font->pattern = pattern;
 155         font->h = xfont->ascent + xfont->descent;
 156         font->dpy = drw->dpy;
 157
 158         return font;
 159 }
 160
 161 static void
 162 xfont_free(Fnt *font)
 163 {
 164         if (!font)
 165                 return;
 166         if (font->pattern)
 167                 FcPatternDestroy(font->pattern);
 168         XftFontClose(font->dpy, font->xfont);
 169         free(font);
 170 }
 171
 172 Fnt*
 173 drw_fontset_create(Drw* drw, const char *fonts[], size_t fontcount)
 174 {
 175         Fnt *cur, *ret = NULL;
 176         size_t i;
 177
 178         if (!drw || !fonts)
 179                 return NULL;
 180
 181         for (i = 1; i <= fontcount; i++) {
 182                 if ((cur = xfont_create(drw, fonts[fontcount - i], NULL))) {
 183                         cur->next = ret;
 184                         ret = cur;
 185                 }
 186         }
 187         return (drw->fonts = ret);
 188 }
 189
 190 void
 191 drw_fontset_free(Fnt *font)
 192 {
 193         if (font) {
 194                 drw_fontset_free(font->next);
 195                 xfont_free(font);
 196         }
 197 }
 198
 199 void
 200 drw_clr_create(Drw *drw, Clr *dest, const char *clrname, unsigned int alpha)
 201 {
 202         if (!drw || !dest || !clrname)
 203                 return;
 204
 205         if (!XftColorAllocName(drw->dpy, drw->visual, drw->cmap,
 206                                clrname, dest))
 207                 die("error, cannot allocate color '%s'", clrname);
 208
 209         dest->pixel = (dest->pixel & 0x00ffffffU) | (alpha << 24);
 210 }
 211
 212 /* Wrapper to create color schemes. The caller has to call free(3) on the
 213  * returned color scheme when done using it. */
 214 Clr *
 215 drw_scm_create(Drw *drw, const char *clrnames[], const unsigned int alphas[], size_t clrcount)
 216 {
 217         size_t i;
 218         Clr *ret;
 219
 220         /* need at least two colors for a scheme */
 221         if (!drw || !clrnames || clrcount < 2 || !(ret = ecalloc(clrcount, sizeof(XftColor))))
 222                 return NULL;
 223
 224         for (i = 0; i < clrcount; i++)
 225                 drw_clr_create(drw, &ret[i], clrnames[i], alphas[i]);
 226         return ret;
 227 }
 228
 229 void
 230 drw_setfontset(Drw *drw, Fnt *set)
 231 {
 232         if (drw)
 233                 drw->fonts = set;
 234 }
 235
 236 void
 237 drw_setscheme(Drw *drw, Clr *scm)
 238 {
 239         if (drw)
 240                 drw->scheme = scm;
 241 }
 242
 243 void
 244 drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int filled, int invert)
 245 {
 246         if (!drw || !drw->scheme)
 247                 return;
 248         XSetForeground(drw->dpy, drw->gc, invert ? drw->scheme[ColBg].pixel : drw->scheme[ColFg].pixel);
 249         if (filled)
 250                 XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
 251         else
 252                 XDrawRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w - 1, h - 1);
 253 }
 254
 255 int
 256 drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lpad, const char *text, int invert)
 257 {
 258         char buf[1024];
 259         int ty;
 260         unsigned int ew;
 261         XftDraw *d = NULL;
 262         Fnt *usedfont, *curfont, *nextfont;
 263         size_t i, len;
 264         int utf8strlen, utf8charlen, render = x || y || w || h;
 265         long utf8codepoint = 0;
 266         const char *utf8str;
 267         FcCharSet *fccharset;
 268         FcPattern *fcpattern;
 269         FcPattern *match;
 270         XftResult result;
 271         int charexists = 0;
 272
 273         if (!drw || (render && !drw->scheme) || !text || !drw->fonts)
 274                 return 0;
 275
 276         if (!render) {
 277                 w = ~w;
 278         } else {
 279                 XSetForeground(drw->dpy, drw->gc, drw->scheme[invert ? ColFg : ColBg].pixel);
 280                 XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
 281                 d = XftDrawCreate(drw->dpy, drw->drawable, drw->visual, drw->cmap);
 282                 x += lpad;
 283                 w -= lpad;
 284         }
 285
 286         usedfont = drw->fonts;
 287         while (1) {
 288                 utf8strlen = 0;
 289                 utf8str = text;
 290                 nextfont = NULL;
 291                 while (*text) {
 292                         utf8charlen = utf8decode(text, &utf8codepoint, UTF_SIZ);
 293                         for (curfont = drw->fonts; curfont; curfont = curfont->next) {
 294                                 charexists = charexists || XftCharExists(drw->dpy, curfont->xfont, utf8codepoint);
 295                                 if (charexists) {
 296                                         if (curfont == usedfont) {
 297                                                 utf8strlen += utf8charlen;
 298                                                 text += utf8charlen;
 299                                         } else {
 300                                                 nextfont = curfont;
 301                                         }
 302                                         break;
 303                                 }
 304                         }
 305
 306                         if (!charexists || nextfont)
 307                                 break;
 308                         else
 309                                 charexists = 0;
 310                 }
 311
 312                 if (utf8strlen) {
 313                         drw_font_getexts(usedfont, utf8str, utf8strlen, &ew, NULL);
 314                         /* shorten text if necessary */
 315                         for (len = MIN(utf8strlen, sizeof(buf) - 1); len && ew > w; len--)
 316                                 drw_font_getexts(usedfont, utf8str, len, &ew, NULL);
 317
 318                         if (len) {
 319                                 memcpy(buf, utf8str, len);
 320                                 buf[len] = '\0';
 321                                 if (len < utf8strlen)
 322                                         for (i = len; i && i > len - 3; buf[--i] = '.')
 323                                                 ; /* NOP */
 324
 325                                 if (render) {
 326                                         ty = y + (h - usedfont->h) / 2 + usedfont->xfont->ascent;
 327                                         XftDrawStringUtf8(d, &drw->scheme[invert ? ColBg : ColFg],
 328                                                           usedfont->xfont, x, ty, (XftChar8 *)buf, len);
 329                                 }
 330                                 x += ew;
 331                                 w -= ew;
 332                         }
 333                 }
 334
 335                 if (!*text) {
 336                         break;
 337                 } else if (nextfont) {
 338                         charexists = 0;
 339                         usedfont = nextfont;
 340                 } else {
 341                         /* Regardless of whether or not a fallback font is found, the
 342                          * character must be drawn. */
 343                         charexists = 1;
 344
 345                         fccharset = FcCharSetCreate();
 346                         FcCharSetAddChar(fccharset, utf8codepoint);
 347
 348                         if (!drw->fonts->pattern) {
 349                                 /* Refer to the comment in xfont_create for more information. */
 350                                 die("the first font in the cache must be loaded from a font string.");
 351                         }
 352
 353                         fcpattern = FcPatternDuplicate(drw->fonts->pattern);
 354                         FcPatternAddCharSet(fcpattern, FC_CHARSET, fccharset);
 355                         FcPatternAddBool(fcpattern, FC_SCALABLE, FcTrue);
 356                         FcPatternAddBool(fcpattern, FC_COLOR, FcFalse);
 357
 358                         FcConfigSubstitute(NULL, fcpattern, FcMatchPattern);
 359                         FcDefaultSubstitute(fcpattern);
 360                         match = XftFontMatch(drw->dpy, drw->screen, fcpattern, &result);
 361
 362                         FcCharSetDestroy(fccharset);
 363                         FcPatternDestroy(fcpattern);
 364
 365                         if (match) {
 366                                 usedfont = xfont_create(drw, NULL, match);
 367                                 if (usedfont && XftCharExists(drw->dpy, usedfont->xfont, utf8codepoint)) {
 368                                         for (curfont = drw->fonts; curfont->next; curfont = curfont->next)
 369                                                 ; /* NOP */
 370                                         curfont->next = usedfont;
 371                                 } else {
 372                                         xfont_free(usedfont);
 373                                         usedfont = drw->fonts;
 374                                 }
 375                         }
 376                 }
 377         }
 378         if (d)
 379                 XftDrawDestroy(d);
 380
 381         return x + (render ? w : 0);
 382 }
 383
 384 void
 385 drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int h)
 386 {
 387         if (!drw)
 388                 return;
 389
 390         XCopyArea(drw->dpy, drw->drawable, win, drw->gc, x, y, w, h, x, y);
 391         XSync(drw->dpy, False);
 392 }
 393
 394 unsigned int
 395 drw_fontset_getwidth(Drw *drw, const char *text)
 396 {
 397         if (!drw || !drw->fonts || !text)
 398                 return 0;
 399         return drw_text(drw, 0, 0, 0, 0, 0, text, 0);
 400 }
 401
 402 void
 403 drw_font_getexts(Fnt *font, const char *text, unsigned int len, unsigned int *w, unsigned int *h)
 404 {
 405         XGlyphInfo ext;
 406
 407         if (!font || !text)
 408                 return;
 409
 410         XftTextExtentsUtf8(font->dpy, font->xfont, (XftChar8 *)text, len, &ext);
 411         if (w)
 412                 *w = ext.xOff;
 413         if (h)
 414                 *h = font->h;
 415 }
 416
 417 Cur *
 418 drw_cur_create(Drw *drw, int shape)
 419 {
 420         Cur *cur;
 421
 422         if (!drw || !(cur = ecalloc(1, sizeof(Cur))))
 423                 return NULL;
 424
 425         cur->cursor = XCreateFontCursor(drw->dpy, shape);
 426
 427         return cur;
 428 }
 429
 430 void
 431 drw_cur_free(Drw *drw, Cur *cursor)
 432 {
 433         if (!cursor)
 434                 return;
 435
 436         XFreeCursor(drw->dpy, cursor->cursor);
 437         free(cursor);
 438 }