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;
  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->visual = visual;
  75         drw->depth = depth;
  76         drw->cmap = cmap;
  77         drw->drawable = XCreatePixmap(dpy, root, w, h, depth);
  78         drw->gc = XCreateGC(dpy, drw->drawable, 0, NULL);
  79         drw->fontcount = 0;
  80         XSetLineAttributes(dpy, drw->gc, 1, LineSolid, CapButt, JoinMiter);
  81
  82         return drw;
  83 }
  84
  85 void
  86 drw_resize(Drw *drw, unsigned int w, unsigned int h)
  87 {
  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, drw->depth);
  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         XftFont *xfont = NULL;
 115         FcPattern *pattern = NULL;
 116
 117         if (fontname) {
 118                 /* Using the pattern found at font->xfont->pattern does not yield same
 119                  * the same substitution results as using the pattern returned by
 120                  * FcNameParse; using the latter results in the desired fallback
 121                  * behaviour whereas the former just results in
 122                  * missing-character-rectangles being drawn, at least with some fonts.
 123                  */
 124                 if (!(xfont = XftFontOpenName(drw->dpy, drw->screen, fontname))) {
 125                         fprintf(stderr, "error, cannot load font: '%s'\n", fontname);
 126                         return NULL;
 127                 }
 128                 if (!(pattern = FcNameParse((FcChar8 *) fontname))) {
 129                         fprintf(stderr, "error, cannot load font: '%s'\n", fontname);
 130                         XftFontClose(drw->dpy, xfont);
 131                         return NULL;
 132                 }
 133         } else if (fontpattern) {
 134                 if (!(xfont = XftFontOpenPattern(drw->dpy, fontpattern))) {
 135                         fprintf(stderr, "error, cannot load font pattern.\n");
 136                         return NULL;
 137                 }
 138         } else {
 139                 die("no font specified.\n");
 140         }
 141
 142         font = ecalloc(1, sizeof(Fnt));
 143         font->xfont = xfont;
 144         font->pattern = pattern;
 145         font->ascent = xfont->ascent;
 146         font->descent = 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, unsigned int alpha)
 187 {
 188         Clr *clr;
 189
 190         clr = ecalloc(1, sizeof(Clr));
 191         if (!XftColorAllocName(drw->dpy, drw->visual, drw->cmap,
 192                                clrname, &clr->rgb))
 193                 die("error, cannot allocate color '%s'\n", clrname);
 194         clr->pix = (clr->rgb.pixel & 0x00ffffffU) | (alpha << 24);
 195
 196         return clr;
 197 }
 198
 199 void
 200 drw_clr_free(Clr *clr)
 201 {
 202         free(clr);
 203 }
 204
 205 void
 206 drw_setscheme(Drw *drw, ClrScheme *scheme)
 207 {
 208         drw->scheme = scheme;
 209 }
 210
 211 void
 212 drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int filled, int empty, int invert)
 213 {
 214         if (!drw->scheme)
 215                 return;
 216         XSetForeground(drw->dpy, drw->gc, invert ? drw->scheme->bg->pix : drw->scheme->fg->pix);
 217         if (filled)
 218                 XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w + 1, h + 1);
 219         else if (empty)
 220                 XDrawRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
 221 }
 222
 223 int
 224 drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, const char *text, int invert)
 225 {
 226         char buf[1024];
 227         int tx, ty, th;
 228         Extnts tex;
 229         XftDraw *d = NULL;
 230         Fnt *curfont, *nextfont;
 231         size_t i, len;
 232         int utf8strlen, utf8charlen, render;
 233         long utf8codepoint = 0;
 234         const char *utf8str;
 235         FcCharSet *fccharset;
 236         FcPattern *fcpattern;
 237         FcPattern *match;
 238         XftResult result;
 239         int charexists = 0;
 240
 241         if (!drw->scheme || !drw->fontcount)
 242                 return 0;
 243
 244         if (!(render = x || y || w || h)) {
 245                 w = ~w;
 246         } else {
 247                 XSetForeground(drw->dpy, drw->gc, invert ?
 248                                drw->scheme->fg->pix : drw->scheme->bg->pix);
 249                 XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
 250                 d = XftDrawCreate(drw->dpy, drw->drawable, drw->visual, drw->cmap);
 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 }