drw.c - dwm - dynamic window manager
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drw.c (11041B)
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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 font = ecalloc(1, sizeof(Fnt));
137 font->xfont = xfont;
138 font->pattern = pattern;
139 font->h = xfont->ascent + xfont->descent;
140 font->dpy = drw->dpy;
141
142 return font;
143 }
144
145 static void
146 xfont_free(Fnt *font)
147 {
148 if (!font)
149 return;
150 if (font->pattern)
151 FcPatternDestroy(font->pattern);
152 XftFontClose(font->dpy, font->xfont);
153 free(font);
154 }
155
156 Fnt*
157 drw_fontset_create(Drw* drw, const char *fonts[], size_t fontcount)
158 {
159 Fnt *cur, *ret = NULL;
160 size_t i;
161
162 if (!drw || !fonts)
163 return NULL;
164
165 for (i = 1; i <= fontcount; i++) {
166 if ((cur = xfont_create(drw, fonts[fontcount - i], NULL))) {
167 cur->next = ret;
168 ret = cur;
169 }
170 }
171 return (drw->fonts = ret);
172 }
173
174 void
175 drw_fontset_free(Fnt *font)
176 {
177 if (font) {
178 drw_fontset_free(font->next);
179 xfont_free(font);
180 }
181 }
182
183 void
184 drw_clr_create(Drw *drw, Clr *dest, const char *clrname)
185 {
186 if (!drw || !dest || !clrname)
187 return;
188
189 if (!XftColorAllocName(drw->dpy, DefaultVisual(drw->dpy, drw->screen),
190 DefaultColormap(drw->dpy, drw->screen),
191 clrname, dest))
192 die("error, cannot allocate color '%s'", clrname);
193 }
194
195 /* Wrapper to create color schemes. The caller has to call free(3) on the
196 * returned color scheme when done using it. */
197 Clr *
198 drw_scm_create(Drw *drw, const char *clrnames[], size_t clrcount)
199 {
200 size_t i;
201 Clr *ret;
202
203 /* need at least two colors for a scheme */
204 if (!drw || !clrnames || clrcount < 2 || !(ret = ecalloc(clrcount, sizeof(XftColor))))
205 return NULL;
206
207 for (i = 0; i < clrcount; i++)
208 drw_clr_create(drw, &ret[i], clrnames[i]);
209 return ret;
210 }
211
212 void
213 drw_setfontset(Drw *drw, Fnt *set)
214 {
215 if (drw)
216 drw->fonts = set;
217 }
218
219 void
220 drw_setscheme(Drw *drw, Clr *scm)
221 {
222 if (drw)
223 drw->scheme = scm;
224 }
225
226 void
227 drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int filled, int invert)
228 {
229 if (!drw || !drw->scheme)
230 return;
231 XSetForeground(drw->dpy, drw->gc, invert ? drw->scheme[ColBg].pixel : drw->scheme[ColFg].pixel);
232 if (filled)
233 XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
234 else
235 XDrawRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w - 1, h - 1);
236 }
237
238 int
239 drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lpad, const char *text, int invert)
240 {
241 int i, ty, ellipsis_x = 0;
242 unsigned int tmpw, ew, ellipsis_w = 0, ellipsis_len;
243 XftDraw *d = NULL;
244 Fnt *usedfont, *curfont, *nextfont;
245 int utf8strlen, utf8charlen, render = x || y || w || h;
246 long utf8codepoint = 0;
247 const char *utf8str;
248 FcCharSet *fccharset;
249 FcPattern *fcpattern;
250 FcPattern *match;
251 XftResult result;
252 int charexists = 0, overflow = 0;
253 /* keep track of a couple codepoints for which we have no match. */
254 enum { nomatches_len = 64 };
255 static struct { long codepoint[nomatches_len]; unsigned int idx; } nomatches;
256 static unsigned int ellipsis_width = 0;
257
258 if (!drw || (render && (!drw->scheme || !w)) || !text || !drw->fonts)
259 return 0;
260
261 if (!render) {
262 w = invert ? invert : ~invert;
263 } else {
264 XSetForeground(drw->dpy, drw->gc, drw->scheme[invert ? ColFg : ColBg].pixel);
265 XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
266 d = XftDrawCreate(drw->dpy, drw->drawable,
267 DefaultVisual(drw->dpy, drw->screen),
268 DefaultColormap(drw->dpy, drw->screen));
269 x += lpad;
270 w -= lpad;
271 }
272
273 usedfont = drw->fonts;
274 if (!ellipsis_width && render)
275 ellipsis_width = drw_fontset_getwidth(drw, "...");
276 while (1) {
277 ew = ellipsis_len = utf8strlen = 0;
278 utf8str = text;
279 nextfont = NULL;
280 while (*text) {
281 utf8charlen = utf8decode(text, &utf8codepoint, UTF_SIZ);
282 for (curfont = drw->fonts; curfont; curfont = curfont->next) {
283 charexists = charexists || XftCharExists(drw->dpy, curfont->xfont, utf8codepoint);
284 if (charexists) {
285 drw_font_getexts(curfont, text, utf8charlen, &tmpw, NULL);
286 if (ew + ellipsis_width <= w) {
287 /* keep track where the ellipsis still fits */
288 ellipsis_x = x + ew;
289 ellipsis_w = w - ew;
290 ellipsis_len = utf8strlen;
291 }
292
293 if (ew + tmpw > w) {
294 overflow = 1;
295 /* called from drw_fontset_getwidth_clamp():
296 * it wants the width AFTER the overflow
297 */
298 if (!render)
299 x += tmpw;
300 else
301 utf8strlen = ellipsis_len;
302 } else if (curfont == usedfont) {
303 utf8strlen += utf8charlen;
304 text += utf8charlen;
305 ew += tmpw;
306 } else {
307 nextfont = curfont;
308 }
309 break;
310 }
311 }
312
313 if (overflow || !charexists || nextfont)
314 break;
315 else
316 charexists = 0;
317 }
318
319 if (utf8strlen) {
320 if (render) {
321 ty = y + (h - usedfont->h) / 2 + usedfont->xfont->ascent;
322 XftDrawStringUtf8(d, &drw->scheme[invert ? ColBg : ColFg],
323 usedfont->xfont, x, ty, (XftChar8 *)utf8str, utf8strlen);
324 }
325 x += ew;
326 w -= ew;
327 }
328 if (render && overflow)
329 drw_text(drw, ellipsis_x, y, ellipsis_w, h, 0, "...", invert);
330
331 if (!*text || overflow) {
332 break;
333 } else if (nextfont) {
334 charexists = 0;
335 usedfont = nextfont;
336 } else {
337 /* Regardless of whether or not a fallback font is found, the
338 * character must be drawn. */
339 charexists = 1;
340
341 for (i = 0; i < nomatches_len; ++i) {
342 /* avoid calling XftFontMatch if we know we won't find a match */
343 if (utf8codepoint == nomatches.codepoint[i])
344 goto no_match;
345 }
346
347 fccharset = FcCharSetCreate();
348 FcCharSetAddChar(fccharset, utf8codepoint);
349
350 if (!drw->fonts->pattern) {
351 /* Refer to the comment in xfont_create for more information. */
352 die("the first font in the cache must be loaded from a font string.");
353 }
354
355 fcpattern = FcPatternDuplicate(drw->fonts->pattern);
356 FcPatternAddCharSet(fcpattern, FC_CHARSET, fccharset);
357 FcPatternAddBool(fcpattern, FC_SCALABLE, FcTrue);
358
359 FcConfigSubstitute(NULL, fcpattern, FcMatchPattern);
360 FcDefaultSubstitute(fcpattern);
361 match = XftFontMatch(drw->dpy, drw->screen, fcpattern, &result);
362
363 FcCharSetDestroy(fccharset);
364 FcPatternDestroy(fcpattern);
365
366 if (match) {
367 usedfont = xfont_create(drw, NULL, match);
368 if (usedfont && XftCharExists(drw->dpy, usedfont->xfont, utf8codepoint)) {
369 for (curfont = drw->fonts; curfont->next; curfont = curfont->next)
370 ; /* NOP */
371 curfont->next = usedfont;
372 } else {
373 xfont_free(usedfont);
374 nomatches.codepoint[++nomatches.idx % nomatches_len] = utf8codepoint;
375 no_match:
376 usedfont = drw->fonts;
377 }
378 }
379 }
380 }
381 if (d)
382 XftDrawDestroy(d);
383
384 return x + (render ? w : 0);
385 }
386
387 void
388 drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int h)
389 {
390 if (!drw)
391 return;
392
393 XCopyArea(drw->dpy, drw->drawable, win, drw->gc, x, y, w, h, x, y);
394 XSync(drw->dpy, False);
395 }
396
397 unsigned int
398 drw_fontset_getwidth(Drw *drw, const char *text)
399 {
400 if (!drw || !drw->fonts || !text)
401 return 0;
402 return drw_text(drw, 0, 0, 0, 0, 0, text, 0);
403 }
404
405 unsigned int
406 drw_fontset_getwidth_clamp(Drw *drw, const char *text, unsigned int n)
407 {
408 unsigned int tmp = 0;
409 if (drw && drw->fonts && text && n)
410 tmp = drw_text(drw, 0, 0, 0, 0, 0, text, n);
411 return MIN(n, tmp);
412 }
413
414 void
415 drw_font_getexts(Fnt *font, const char *text, unsigned int len, unsigned int *w, unsigned int *h)
416 {
417 XGlyphInfo ext;
418
419 if (!font || !text)
420 return;
421
422 XftTextExtentsUtf8(font->dpy, font->xfont, (XftChar8 *)text, len, &ext);
423 if (w)
424 *w = ext.xOff;
425 if (h)
426 *h = font->h;
427 }
428
429 Cur *
430 drw_cur_create(Drw *drw, int shape)
431 {
432 Cur *cur;
433
434 if (!drw || !(cur = ecalloc(1, sizeof(Cur))))
435 return NULL;
436
437 cur->cursor = XCreateFontCursor(drw->dpy, shape);
438
439 return cur;
440 }
441
442 void
443 drw_cur_free(Drw *drw, Cur *cursor)
444 {
445 if (!cursor)
446 return;
447
448 XFreeCursor(drw->dpy, cursor->cursor);
449 free(cursor);
450 }