drw.c - libsl - shared code master of various suckless projects
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drw.c (11585B)
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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
13 static int
14 utf8decode(const char *s_in, long *u, int *err)
15 {
16 static const unsigned char lens[] = {
17 /* 0XXXX */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
18 /* 10XXX */ 0, 0, 0, 0, 0, 0, 0, 0, /* invalid */
19 /* 110XX */ 2, 2, 2, 2,
20 /* 1110X */ 3, 3,
21 /* 11110 */ 4,
22 /* 11111 */ 0, /* invalid */
23 };
24 static const unsigned char leading_mask[] = { 0x7F, 0x1F, 0x0F, 0x07 };
25 static const unsigned int overlong[] = { 0x0, 0x80, 0x0800, 0x10000 };
26
27 const unsigned char *s = (const unsigned char *)s_in;
28 int len = lens[*s >> 3];
29 *u = UTF_INVALID;
30 *err = 1;
31 if (len == 0)
32 return 1;
33
34 long cp = s[0] & leading_mask[len - 1];
35 for (int i = 1; i < len; ++i) {
36 if (s[i] == '\0' || (s[i] & 0xC0) != 0x80)
37 return i;
38 cp = (cp << 6) | (s[i] & 0x3F);
39 }
40 /* out of range, surrogate, overlong encoding */
41 if (cp > 0x10FFFF || (cp >> 11) == 0x1B || cp < overlong[len - 1])
42 return len;
43
44 *err = 0;
45 *u = cp;
46 return len;
47 }
48
49 Drw *
50 drw_create(Display *dpy, int screen, Window root, unsigned int w, unsigned int h)
51 {
52 Drw *drw = ecalloc(1, sizeof(Drw));
53
54 drw->dpy = dpy;
55 drw->screen = screen;
56 drw->root = root;
57 drw->w = w;
58 drw->h = h;
59 drw->drawable = XCreatePixmap(dpy, root, w, h, DefaultDepth(dpy, screen));
60 drw->gc = XCreateGC(dpy, root, 0, NULL);
61 XSetLineAttributes(dpy, drw->gc, 1, LineSolid, CapButt, JoinMiter);
62
63 return drw;
64 }
65
66 void
67 drw_resize(Drw *drw, unsigned int w, unsigned int h)
68 {
69 if (!drw)
70 return;
71
72 drw->w = w;
73 drw->h = h;
74 if (drw->drawable)
75 XFreePixmap(drw->dpy, drw->drawable);
76 drw->drawable = XCreatePixmap(drw->dpy, drw->root, w, h, DefaultDepth(drw->dpy, drw->screen));
77 }
78
79 void
80 drw_free(Drw *drw)
81 {
82 XFreePixmap(drw->dpy, drw->drawable);
83 XFreeGC(drw->dpy, drw->gc);
84 drw_fontset_free(drw->fonts);
85 free(drw);
86 }
87
88 /* This function is an implementation detail. Library users should use
89 * drw_fontset_create instead.
90 */
91 static Fnt *
92 xfont_create(Drw *drw, const char *fontname, FcPattern *fontpattern)
93 {
94 Fnt *font;
95 XftFont *xfont = NULL;
96 FcPattern *pattern = NULL;
97
98 if (fontname) {
99 /* Using the pattern found at font->xfont->pattern does not yield the
100 * same substitution results as using the pattern returned by
101 * FcNameParse; using the latter results in the desired fallback
102 * behaviour whereas the former just results in missing-character
103 * rectangles being drawn, at least with some fonts. */
104 if (!(xfont = XftFontOpenName(drw->dpy, drw->screen, fontname))) {
105 fprintf(stderr, "error, cannot load font from name: '%s'\n", fontname);
106 return NULL;
107 }
108 if (!(pattern = FcNameParse((FcChar8 *) fontname))) {
109 fprintf(stderr, "error, cannot parse font name to pattern: '%s'\n", fontname);
110 XftFontClose(drw->dpy, xfont);
111 return NULL;
112 }
113 } else if (fontpattern) {
114 if (!(xfont = XftFontOpenPattern(drw->dpy, fontpattern))) {
115 fprintf(stderr, "error, cannot load font from pattern.\n");
116 return NULL;
117 }
118 } else {
119 die("no font specified.");
120 }
121
122 font = ecalloc(1, sizeof(Fnt));
123 font->xfont = xfont;
124 font->pattern = pattern;
125 font->h = xfont->ascent + xfont->descent;
126 font->dpy = drw->dpy;
127
128 return font;
129 }
130
131 static void
132 xfont_free(Fnt *font)
133 {
134 if (!font)
135 return;
136 if (font->pattern)
137 FcPatternDestroy(font->pattern);
138 XftFontClose(font->dpy, font->xfont);
139 free(font);
140 }
141
142 Fnt*
143 drw_fontset_create(Drw* drw, const char *fonts[], size_t fontcount)
144 {
145 Fnt *cur, *ret = NULL;
146 size_t i;
147
148 if (!drw || !fonts)
149 return NULL;
150
151 for (i = 1; i <= fontcount; i++) {
152 if ((cur = xfont_create(drw, fonts[fontcount - i], NULL))) {
153 cur->next = ret;
154 ret = cur;
155 }
156 }
157 return (drw->fonts = ret);
158 }
159
160 void
161 drw_fontset_free(Fnt *font)
162 {
163 if (font) {
164 drw_fontset_free(font->next);
165 xfont_free(font);
166 }
167 }
168
169 void
170 drw_clr_create(Drw *drw, Clr *dest, const char *clrname)
171 {
172 if (!drw || !dest || !clrname)
173 return;
174
175 if (!XftColorAllocName(drw->dpy, DefaultVisual(drw->dpy, drw->screen),
176 DefaultColormap(drw->dpy, drw->screen),
177 clrname, dest))
178 die("error, cannot allocate color '%s'", clrname);
179 }
180
181 /* Create color schemes. */
182 Clr *
183 drw_scm_create(Drw *drw, const char *clrnames[], size_t clrcount)
184 {
185 size_t i;
186 Clr *ret;
187
188 /* need at least two colors for a scheme */
189 if (!drw || !clrnames || clrcount < 2 || !(ret = ecalloc(clrcount, sizeof(Clr))))
190 return NULL;
191
192 for (i = 0; i < clrcount; i++)
193 drw_clr_create(drw, &ret[i], clrnames[i]);
194 return ret;
195 }
196
197 void
198 drw_clr_free(Drw *drw, Clr *c)
199 {
200 if (!drw || !c)
201 return;
202
203 /* c is typedef XftColor Clr */
204 XftColorFree(drw->dpy, DefaultVisual(drw->dpy, drw->screen),
205 DefaultColormap(drw->dpy, drw->screen), c);
206 }
207
208 void
209 drw_scm_free(Drw *drw, Clr *scm, size_t clrcount)
210 {
211 size_t i;
212
213 if (!drw || !scm)
214 return;
215
216 for (i = 0; i < clrcount; i++)
217 drw_clr_free(drw, &scm[i]);
218 free(scm);
219 }
220
221 void
222 drw_setfontset(Drw *drw, Fnt *set)
223 {
224 if (drw)
225 drw->fonts = set;
226 }
227
228 void
229 drw_setscheme(Drw *drw, Clr *scm)
230 {
231 if (drw)
232 drw->scheme = scm;
233 }
234
235 void
236 drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int filled, int invert)
237 {
238 if (!drw || !drw->scheme)
239 return;
240 XSetForeground(drw->dpy, drw->gc, invert ? drw->scheme[ColBg].pixel : drw->scheme[ColFg].pixel);
241 if (filled)
242 XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
243 else
244 XDrawRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w - 1, h - 1);
245 }
246
247 int
248 drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lpad, const char *text, int invert)
249 {
250 int ty, ellipsis_x = 0;
251 unsigned int tmpw, ew, ellipsis_w = 0, ellipsis_len, hash, h0, h1;
252 XftDraw *d = NULL;
253 Fnt *usedfont, *curfont, *nextfont;
254 int utf8strlen, utf8charlen, utf8err, render = x || y || w || h;
255 long utf8codepoint = 0;
256 const char *utf8str;
257 FcCharSet *fccharset;
258 FcPattern *fcpattern;
259 FcPattern *match;
260 XftResult result;
261 int charexists = 0, overflow = 0;
262 /* keep track of a couple codepoints for which we have no match. */
263 static unsigned int nomatches[128], ellipsis_width, invalid_width;
264 static const char invalid[] = "�";
265
266 if (!drw || (render && (!drw->scheme || !w)) || !text || !drw->fonts)
267 return 0;
268
269 if (!render) {
270 w = invert ? invert : ~invert;
271 } else {
272 XSetForeground(drw->dpy, drw->gc, drw->scheme[invert ? ColFg : ColBg].pixel);
273 XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
274 if (w < lpad)
275 return x + w;
276 d = XftDrawCreate(drw->dpy, drw->drawable,
277 DefaultVisual(drw->dpy, drw->screen),
278 DefaultColormap(drw->dpy, drw->screen));
279 x += lpad;
280 w -= lpad;
281 }
282
283 usedfont = drw->fonts;
284 if (!ellipsis_width && render)
285 ellipsis_width = drw_fontset_getwidth(drw, "...");
286 if (!invalid_width && render)
287 invalid_width = drw_fontset_getwidth(drw, invalid);
288 while (1) {
289 ew = ellipsis_len = utf8err = utf8charlen = utf8strlen = 0;
290 utf8str = text;
291 nextfont = NULL;
292 while (*text) {
293 utf8charlen = utf8decode(text, &utf8codepoint, &utf8err);
294 for (curfont = drw->fonts; curfont; curfont = curfont->next) {
295 charexists = charexists || XftCharExists(drw->dpy, curfont->xfont, utf8codepoint);
296 if (charexists) {
297 drw_font_getexts(curfont, text, utf8charlen, &tmpw, NULL);
298 if (ew + ellipsis_width <= w) {
299 /* keep track where the ellipsis still fits */
300 ellipsis_x = x + ew;
301 ellipsis_w = w - ew;
302 ellipsis_len = utf8strlen;
303 }
304
305 if (ew + tmpw > w) {
306 overflow = 1;
307 /* called from drw_fontset_getwidth_clamp():
308 * it wants the width AFTER the overflow
309 */
310 if (!render)
311 x += tmpw;
312 else
313 utf8strlen = ellipsis_len;
314 } else if (curfont == usedfont) {
315 text += utf8charlen;
316 utf8strlen += utf8err ? 0 : utf8charlen;
317 ew += utf8err ? 0 : tmpw;
318 } else {
319 nextfont = curfont;
320 }
321 break;
322 }
323 }
324
325 if (overflow || !charexists || nextfont || utf8err)
326 break;
327 else
328 charexists = 0;
329 }
330
331 if (utf8strlen) {
332 if (render) {
333 ty = y + (h - usedfont->h) / 2 + usedfont->xfont->ascent;
334 XftDrawStringUtf8(d, &drw->scheme[invert ? ColBg : ColFg],
335 usedfont->xfont, x, ty, (XftChar8 *)utf8str, utf8strlen);
336 }
337 x += ew;
338 w -= ew;
339 }
340 if (utf8err && (!render || invalid_width < w)) {
341 if (render)
342 drw_text(drw, x, y, w, h, 0, invalid, invert);
343 x += invalid_width;
344 w -= invalid_width;
345 }
346 if (render && overflow)
347 drw_text(drw, ellipsis_x, y, ellipsis_w, h, 0, "...", invert);
348
349 if (!*text || overflow) {
350 break;
351 } else if (nextfont) {
352 charexists = 0;
353 usedfont = nextfont;
354 } else {
355 /* Regardless of whether or not a fallback font is found, the
356 * character must be drawn. */
357 charexists = 1;
358
359 hash = (unsigned int)utf8codepoint;
360 hash = ((hash >> 16) ^ hash) * 0x21F0AAAD;
361 hash = ((hash >> 15) ^ hash) * 0xD35A2D97;
362 h0 = ((hash >> 15) ^ hash) % LENGTH(nomatches);
363 h1 = (hash >> 17) % LENGTH(nomatches);
364 /* avoid expensive XftFontMatch call when we know we won't find a match */
365 if (nomatches[h0] == utf8codepoint || nomatches[h1] == utf8codepoint)
366 goto no_match;
367
368 fccharset = FcCharSetCreate();
369 FcCharSetAddChar(fccharset, utf8codepoint);
370
371 if (!drw->fonts->pattern) {
372 /* Refer to the comment in xfont_create for more information. */
373 die("the first font in the cache must be loaded from a font string.");
374 }
375
376 fcpattern = FcPatternDuplicate(drw->fonts->pattern);
377 FcPatternAddCharSet(fcpattern, FC_CHARSET, fccharset);
378 FcPatternAddBool(fcpattern, FC_SCALABLE, FcTrue);
379
380 FcConfigSubstitute(NULL, fcpattern, FcMatchPattern);
381 FcDefaultSubstitute(fcpattern);
382 match = XftFontMatch(drw->dpy, drw->screen, fcpattern, &result);
383
384 FcCharSetDestroy(fccharset);
385 FcPatternDestroy(fcpattern);
386
387 if (match) {
388 usedfont = xfont_create(drw, NULL, match);
389 if (usedfont && XftCharExists(drw->dpy, usedfont->xfont, utf8codepoint)) {
390 for (curfont = drw->fonts; curfont->next; curfont = curfont->next)
391 ; /* NOP */
392 curfont->next = usedfont;
393 } else {
394 xfont_free(usedfont);
395 nomatches[nomatches[h0] ? h1 : h0] = utf8codepoint;
396 no_match:
397 usedfont = drw->fonts;
398 }
399 }
400 }
401 }
402 if (d)
403 XftDrawDestroy(d);
404
405 return x + (render ? w : 0);
406 }
407
408 void
409 drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int h)
410 {
411 if (!drw)
412 return;
413
414 XCopyArea(drw->dpy, drw->drawable, win, drw->gc, x, y, w, h, x, y);
415 XSync(drw->dpy, False);
416 }
417
418 unsigned int
419 drw_fontset_getwidth(Drw *drw, const char *text)
420 {
421 if (!drw || !drw->fonts || !text)
422 return 0;
423 return drw_text(drw, 0, 0, 0, 0, 0, text, 0);
424 }
425
426 unsigned int
427 drw_fontset_getwidth_clamp(Drw *drw, const char *text, unsigned int n)
428 {
429 unsigned int tmp = 0;
430 if (drw && drw->fonts && text && n)
431 tmp = drw_text(drw, 0, 0, 0, 0, 0, text, n);
432 return MIN(n, tmp);
433 }
434
435 void
436 drw_font_getexts(Fnt *font, const char *text, unsigned int len, unsigned int *w, unsigned int *h)
437 {
438 XGlyphInfo ext;
439
440 if (!font || !text)
441 return;
442
443 XftTextExtentsUtf8(font->dpy, font->xfont, (XftChar8 *)text, len, &ext);
444 if (w)
445 *w = ext.xOff;
446 if (h)
447 *h = font->h;
448 }
449
450 Cur *
451 drw_cur_create(Drw *drw, int shape)
452 {
453 Cur *cur;
454
455 if (!drw || !(cur = ecalloc(1, sizeof(Cur))))
456 return NULL;
457
458 cur->cursor = XCreateFontCursor(drw->dpy, shape);
459
460 return cur;
461 }
462
463 void
464 drw_cur_free(Drw *drw, Cur *cursor)
465 {
466 if (!cursor)
467 return;
468
469 XFreeCursor(drw->dpy, cursor->cursor);
470 free(cursor);
471 }