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local/src/dmenu/drw.c
1 /* See LICENSE file for copyright and license details. */
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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 = 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->drawable = XCreatePixmap(dpy, root, w, h, DefaultDepth(dpy, screen));
74 drw->gc = XCreateGC(dpy, root, 0, NULL);
75 XSetLineAttributes(dpy, drw->gc, 1, LineSolid, CapButt, JoinMiter);
76
77 return drw;
78 }
79
80 void
81 drw_resize(Drw *drw, unsigned int w, unsigned int h)
82 {
83 if (!drw)
84 return;
85
86 drw->w = w;
87 drw->h = h;
88 if (drw->drawable)
89 XFreePixmap(drw->dpy, drw->drawable);
90 drw->drawable = XCreatePixmap(drw->dpy, drw->root, w, h, DefaultDepth(drw->dpy, drw->screen));
91 }
92
93 void
94 drw_free(Drw *drw)
95 {
96 XFreePixmap(drw->dpy, drw->drawable);
97 XFreeGC(drw->dpy, drw->gc);
98 drw_fontset_free(drw->fonts);
99 free(drw);
100 }
101
102 /* This function is an implementation detail. Library users should use
103 * drw_fontset_create instead.
104 */
105 static Fnt *
106 xfont_create(Drw *drw, const char *fontname, FcPattern *fontpattern)
107 {
108 Fnt *font;
109 XftFont *xfont = NULL;
110 FcPattern *pattern = NULL;
111
112 if (fontname) {
113 /* Using the pattern found at font->xfont->pattern does not yield the
114 * same substitution results as using the pattern returned by
115 * FcNameParse; using the latter results in the desired fallback
116 * behaviour whereas the former just results in missing-character
117 * rectangles being drawn, at least with some fonts. */
118 if (!(xfont = XftFontOpenName(drw->dpy, drw->screen, fontname))) {
119 fprintf(stderr, "error, cannot load font from name: '%s'\n", fontname);
120 return NULL;
121 }
122 if (!(pattern = FcNameParse((FcChar8 *) fontname))) {
123 fprintf(stderr, "error, cannot parse font name to pattern: '%s'\n", fontname);
124 XftFontClose(drw->dpy, xfont);
125 return NULL;
126 }
127 } else if (fontpattern) {
128 if (!(xfont = XftFontOpenPattern(drw->dpy, fontpattern))) {
129 fprintf(stderr, "error, cannot load font from pattern.\n");
130 return NULL;
131 }
132 } else {
133 die("no font specified.");
134 }
135
136 /* Do not allow using color fonts. This is a workaround for a BadLength
137 * error from Xft with color glyphs. Modelled on the Xterm workaround. See
138 * https://bugzilla.redhat.com/show_bug.cgi?id=1498269
139 * https://lists.suckless.org/dev/1701/30932.html
140 * https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=916349
141 * and lots more all over the internet.
142 */
143
144 FcBool iscol;
145 if(FcPatternGetBool(xfont->pattern, FC_COLOR, 0, &iscol) == FcResultMatch && iscol) {
146 XftFontClose(drw->dpy, xfont);
147 return NULL;
148 }
149
150
151 font = ecalloc(1, sizeof(Fnt));
152 font->xfont = xfont;
153 font->pattern = pattern;
154 font->h = xfont->ascent + xfont->descent;
155 font->dpy = drw->dpy;
156
157 return font;
158 }
159
160 static void
161 xfont_free(Fnt *font)
162 {
163 if (!font)
164 return;
165 if (font->pattern)
166 FcPatternDestroy(font->pattern);
167 XftFontClose(font->dpy, font->xfont);
168 free(font);
169 }
170
171 Fnt*
172 drw_fontset_create(Drw* drw, const char *fonts[], size_t fontcount)
173 {
174 Fnt *cur, *ret = NULL;
175 size_t i;
176
177 if (!drw || !fonts)
178 return NULL;
179
180 for (i = 1; i <= fontcount; i++) {
181 if ((cur = xfont_create(drw, fonts[fontcount - i], NULL))) {
182 cur->next = ret;
183 ret = cur;
184 }
185 }
186 return (drw->fonts = ret);
187 }
188
189 void
190 drw_fontset_free(Fnt *font)
191 {
192 if (font) {
193 drw_fontset_free(font->next);
194 xfont_free(font);
195 }
196 }
197
198 void
199 drw_clr_create(Drw *drw, Clr *dest, const char *clrname)
200 {
201 if (!drw || !dest || !clrname)
202 return;
203
204 if (!XftColorAllocName(drw->dpy, DefaultVisual(drw->dpy, drw->screen),
205 DefaultColormap(drw->dpy, drw->screen),
206 clrname, dest))
207 die("error, cannot allocate color '%s'", clrname);
208 }
209
210 /* Wrapper to create color schemes. The caller has to call free(3) on the
211 * returned color scheme when done using it. */
212 Clr *
213 drw_scm_create(Drw *drw, const char *clrnames[], size_t clrcount)
214 {
215 size_t i;
216 Clr *ret;
217
218 /* need at least two colors for a scheme */
219 if (!drw || !clrnames || clrcount < 2 || !(ret = ecalloc(clrcount, sizeof(XftColor))))
220 return NULL;
221
222 for (i = 0; i < clrcount; i++)
223 drw_clr_create(drw, &ret[i], clrnames[i]);
224 return ret;
225 }
226
227 void
228 drw_setfontset(Drw *drw, Fnt *set)
229 {
230 if (drw)
231 drw->fonts = set;
232 }
233
234 void
235 drw_setscheme(Drw *drw, Clr *scm)
236 {
237 if (drw)
238 drw->scheme = scm;
239 }
240
241 void
242 drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int filled, int invert)
243 {
244 if (!drw || !drw->scheme)
245 return;
246 XSetForeground(drw->dpy, drw->gc, invert ? drw->scheme[ColBg].pixel : drw->scheme[ColFg].pixel);
247 if (filled)
248 XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
249 else
250 XDrawRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w - 1, h - 1);
251 }
252
253 int
254 drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lpad, const char *text, int invert)
255 {
256 char buf[1024];
257 int ty;
258 unsigned int ew;
259 XftDraw *d = NULL;
260 Fnt *usedfont, *curfont, *nextfont;
261 size_t i, len;
262 int utf8strlen, utf8charlen, render = x || y || w || h;
263 long utf8codepoint = 0;
264 const char *utf8str;
265 FcCharSet *fccharset;
266 FcPattern *fcpattern;
267 FcPattern *match;
268 XftResult result;
269 int charexists = 0;
270
271 if (!drw || (render && !drw->scheme) || !text || !drw->fonts)
272 return 0;
273
274 if (!render) {
275 w = ~w;
276 } else {
277 XSetForeground(drw->dpy, drw->gc, drw->scheme[invert ? ColFg : ColBg].pixel);
278 XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
279 d = XftDrawCreate(drw->dpy, drw->drawable,
280 DefaultVisual(drw->dpy, drw->screen),
281 DefaultColormap(drw->dpy, drw->screen));
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 }
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