drw.c - dwm - my customized version of dwm (hiltjo branch)
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drw.c (11609B)
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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 = 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 FcBool iscol;
144 if(FcPatternGetBool(xfont->pattern, FC_COLOR, 0, &iscol) == FcResultMatch && iscol) {
145 XftFontClose(drw->dpy, xfont);
146 return NULL;
147 }
148
149 font = ecalloc(1, sizeof(Fnt));
150 font->xfont = xfont;
151 font->pattern = pattern;
152 font->h = xfont->ascent + xfont->descent;
153 font->dpy = drw->dpy;
154
155 return font;
156 }
157
158 static void
159 xfont_free(Fnt *font)
160 {
161 if (!font)
162 return;
163 if (font->pattern)
164 FcPatternDestroy(font->pattern);
165 XftFontClose(font->dpy, font->xfont);
166 free(font);
167 }
168
169 Fnt*
170 drw_fontset_create(Drw* drw, const char *fonts[], size_t fontcount)
171 {
172 Fnt *cur, *ret = NULL;
173 size_t i;
174
175 if (!drw || !fonts)
176 return NULL;
177
178 for (i = 1; i <= fontcount; i++) {
179 if ((cur = xfont_create(drw, fonts[fontcount - i], NULL))) {
180 cur->next = ret;
181 ret = cur;
182 }
183 }
184 return (drw->fonts = ret);
185 }
186
187 void
188 drw_fontset_free(Fnt *font)
189 {
190 if (font) {
191 drw_fontset_free(font->next);
192 xfont_free(font);
193 }
194 }
195
196 void
197 drw_clr_create(Drw *drw, Clr *dest, const char *clrname)
198 {
199 if (!drw || !dest || !clrname)
200 return;
201
202 if (!XftColorAllocName(drw->dpy, DefaultVisual(drw->dpy, drw->screen),
203 DefaultColormap(drw->dpy, drw->screen),
204 clrname, dest))
205 die("error, cannot allocate color '%s'", clrname);
206 }
207
208 /* Wrapper to create color schemes. The caller has to call free(3) on the
209 * returned color scheme when done using it. */
210 Clr *
211 drw_scm_create(Drw *drw, const char *clrnames[], size_t clrcount)
212 {
213 size_t i;
214 Clr *ret;
215
216 /* need at least two colors for a scheme */
217 if (!drw || !clrnames || clrcount < 2 || !(ret = ecalloc(clrcount, sizeof(XftColor))))
218 return NULL;
219
220 for (i = 0; i < clrcount; i++)
221 drw_clr_create(drw, &ret[i], clrnames[i]);
222 return ret;
223 }
224
225 void
226 drw_setfontset(Drw *drw, Fnt *set)
227 {
228 if (drw)
229 drw->fonts = set;
230 }
231
232 void
233 drw_setscheme(Drw *drw, Clr *scm)
234 {
235 if (drw)
236 drw->scheme = scm;
237 }
238
239 void
240 drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int filled, int invert)
241 {
242 if (!drw || !drw->scheme)
243 return;
244 XSetForeground(drw->dpy, drw->gc, invert ? drw->scheme[ColBg].pixel : drw->scheme[ColFg].pixel);
245 if (filled)
246 XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
247 else
248 XDrawRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w - 1, h - 1);
249 }
250
251 int
252 drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lpad, const char *text, int invert)
253 {
254 int i, ty, ellipsis_x = 0;
255 unsigned int tmpw, ew, ellipsis_w = 0, ellipsis_len;
256 XftDraw *d = NULL;
257 Fnt *usedfont, *curfont, *nextfont;
258 int utf8strlen, utf8charlen, render = x || y || w || h;
259 long utf8codepoint = 0;
260 const char *utf8str;
261 FcCharSet *fccharset;
262 FcPattern *fcpattern;
263 FcPattern *match;
264 XftResult result;
265 int charexists = 0, overflow = 0;
266 /* keep track of a couple codepoints for which we have no match. */
267 enum { nomatches_len = 64 };
268 static struct { long codepoint[nomatches_len]; unsigned int idx; } nomatches;
269 static unsigned int ellipsis_width = 0;
270
271 if (!drw || (render && (!drw->scheme || !w)) || !text || !drw->fonts)
272 return 0;
273
274 if (!render) {
275 w = invert ? invert : ~invert;
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 if (!ellipsis_width && render)
288 ellipsis_width = drw_fontset_getwidth(drw, "...");
289 while (1) {
290 ew = ellipsis_len = utf8strlen = 0;
291 utf8str = text;
292 nextfont = NULL;
293 while (*text) {
294 utf8charlen = utf8decode(text, &utf8codepoint, UTF_SIZ);
295 for (curfont = drw->fonts; curfont; curfont = curfont->next) {
296 charexists = charexists || XftCharExists(drw->dpy, curfont->xfont, utf8codepoint);
297 if (charexists) {
298 drw_font_getexts(curfont, text, utf8charlen, &tmpw, NULL);
299 if (ew + ellipsis_width <= w) {
300 /* keep track where the ellipsis still fits */
301 ellipsis_x = x + ew;
302 ellipsis_w = w - ew;
303 ellipsis_len = utf8strlen;
304 }
305
306 if (ew + tmpw > w) {
307 overflow = 1;
308 /* called from drw_fontset_getwidth_clamp():
309 * it wants the width AFTER the overflow
310 */
311 if (!render)
312 x += tmpw;
313 else
314 utf8strlen = ellipsis_len;
315 } else if (curfont == usedfont) {
316 utf8strlen += utf8charlen;
317 text += utf8charlen;
318 ew += tmpw;
319 } else {
320 nextfont = curfont;
321 }
322 break;
323 }
324 }
325
326 if (overflow || !charexists || nextfont)
327 break;
328 else
329 charexists = 0;
330 }
331
332 if (utf8strlen) {
333 if (render) {
334 ty = y + (h - usedfont->h) / 2 + usedfont->xfont->ascent;
335 XftDrawStringUtf8(d, &drw->scheme[invert ? ColBg : ColFg],
336 usedfont->xfont, x, ty, (XftChar8 *)utf8str, utf8strlen);
337 }
338 x += ew;
339 w -= ew;
340 }
341 if (render && overflow)
342 drw_text(drw, ellipsis_x, y, ellipsis_w, h, 0, "...", invert);
343
344 if (!*text || overflow) {
345 break;
346 } else if (nextfont) {
347 charexists = 0;
348 usedfont = nextfont;
349 } else {
350 /* Regardless of whether or not a fallback font is found, the
351 * character must be drawn. */
352 charexists = 1;
353
354 for (i = 0; i < nomatches_len; ++i) {
355 /* avoid calling XftFontMatch if we know we won't find a match */
356 if (utf8codepoint == nomatches.codepoint[i])
357 goto no_match;
358 }
359
360 fccharset = FcCharSetCreate();
361 FcCharSetAddChar(fccharset, utf8codepoint);
362
363 if (!drw->fonts->pattern) {
364 /* Refer to the comment in xfont_create for more information. */
365 die("the first font in the cache must be loaded from a font string.");
366 }
367
368 fcpattern = FcPatternDuplicate(drw->fonts->pattern);
369 FcPatternAddCharSet(fcpattern, FC_CHARSET, fccharset);
370 FcPatternAddBool(fcpattern, FC_SCALABLE, FcTrue);
371 FcPatternAddBool(fcpattern, FC_COLOR, FcFalse);
372
373 FcConfigSubstitute(NULL, fcpattern, FcMatchPattern);
374 FcDefaultSubstitute(fcpattern);
375 match = XftFontMatch(drw->dpy, drw->screen, fcpattern, &result);
376
377 FcCharSetDestroy(fccharset);
378 FcPatternDestroy(fcpattern);
379
380 if (match) {
381 usedfont = xfont_create(drw, NULL, match);
382 if (usedfont && XftCharExists(drw->dpy, usedfont->xfont, utf8codepoint)) {
383 for (curfont = drw->fonts; curfont->next; curfont = curfont->next)
384 ; /* NOP */
385 curfont->next = usedfont;
386 } else {
387 xfont_free(usedfont);
388 nomatches.codepoint[++nomatches.idx % nomatches_len] = utf8codepoint;
389 no_match:
390 usedfont = drw->fonts;
391 }
392 }
393 }
394 }
395 if (d)
396 XftDrawDestroy(d);
397
398 return x + (render ? w : 0);
399 }
400
401 void
402 drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int h)
403 {
404 if (!drw)
405 return;
406
407 XCopyArea(drw->dpy, drw->drawable, win, drw->gc, x, y, w, h, x, y);
408 XSync(drw->dpy, False);
409 }
410
411 unsigned int
412 drw_fontset_getwidth(Drw *drw, const char *text)
413 {
414 if (!drw || !drw->fonts || !text)
415 return 0;
416 return drw_text(drw, 0, 0, 0, 0, 0, text, 0);
417 }
418
419 unsigned int
420 drw_fontset_getwidth_clamp(Drw *drw, const char *text, unsigned int n)
421 {
422 unsigned int tmp = 0;
423 if (drw && drw->fonts && text && n)
424 tmp = drw_text(drw, 0, 0, 0, 0, 0, text, n);
425 return MIN(n, tmp);
426 }
427
428 void
429 drw_font_getexts(Fnt *font, const char *text, unsigned int len, unsigned int *w, unsigned int *h)
430 {
431 XGlyphInfo ext;
432
433 if (!font || !text)
434 return;
435
436 XftTextExtentsUtf8(font->dpy, font->xfont, (XftChar8 *)text, len, &ext);
437 if (w)
438 *w = ext.xOff;
439 if (h)
440 *h = font->h;
441 }
442
443 Cur *
444 drw_cur_create(Drw *drw, int shape)
445 {
446 Cur *cur;
447
448 if (!drw || !(cur = ecalloc(1, sizeof(Cur))))
449 return NULL;
450
451 cur->cursor = XCreateFontCursor(drw->dpy, shape);
452
453 return cur;
454 }
455
456 void
457 drw_cur_free(Drw *drw, Cur *cursor)
458 {
459 if (!cursor)
460 return;
461
462 XFreeCursor(drw->dpy, cursor->cursor);
463 free(cursor);
464 }