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0 /* See LICENSE file for copyright and license details. */
1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <string.h>
4 #include <X11/Xlib.h>
5 #include <X11/Xft/Xft.h>
6
7 #include "drw.h"
8 #include "util.h"
9
10 #define UTF_INVALID 0xFFFD
11 #define UTF_SIZ 4
12
13 static const unsigned char utfbyte[UTF_SIZ + 1] = {0x80, 0, 0xC0, 0xE0, 0xF0};
14 static const unsigned char utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
15 static const long utfmin[UTF_SIZ + 1] = { 0, 0, 0x80, 0x800, 0x10000};
16 static const long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
17
18 static long
19 utf8decodebyte(const char c, size_t *i)
20 {
21 for (*i = 0; *i < (UTF_SIZ + 1); ++(*i))
22 if (((unsigned char)c & utfmask[*i]) == utfbyte[*i])
23 return (unsigned char)c & ~utfmask[*i];
24 return 0;
25 }
26
27 static size_t
28 utf8validate(long *u, size_t i)
29 {
30 if (!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
31 *u = UTF_INVALID;
32 for (i = 1; *u > utfmax[i]; ++i)
33 ;
34 return i;
35 }
36
37 static size_t
38 utf8decode(const char *c, long *u, size_t clen)
39 {
40 size_t i, j, len, type;
41 long udecoded;
42
43 *u = UTF_INVALID;
44 if (!clen)
45 return 0;
46 udecoded = utf8decodebyte(c[0], &len);
47 if (!BETWEEN(len, 1, UTF_SIZ))
48 return 1;
49 for (i = 1, j = 1; i < clen && j < len; ++i, ++j) {
50 udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
51 if (type)
52 return j;
53 }
54 if (j < len)
55 return 0;
56 *u = udecoded;
57 utf8validate(u, len);
58
59 return len;
60 }
61
62 Drw *
63 drw_create(Display *dpy, int screen, Window root, unsigned int w, unsigned int h)
64 {
65 Drw *drw = ecalloc(1, sizeof(Drw));
66
67 drw->dpy = dpy;
68 drw->screen = screen;
69 drw->root = root;
70 drw->w = w;
71 drw->h = h;
72 drw->drawable = XCreatePixmap(dpy, root, w, h, DefaultDepth(dpy, screen));
73 drw->gc = XCreateGC(dpy, root, 0, NULL);
74 XSetLineAttributes(dpy, drw->gc, 1, LineSolid, CapButt, JoinMiter);
75
76 return drw;
77 }
78
79 void
80 drw_resize(Drw *drw, unsigned int w, unsigned int h)
81 {
82 if (!drw)
83 return;
84
85 drw->w = w;
86 drw->h = h;
87 if (drw->drawable)
88 XFreePixmap(drw->dpy, drw->drawable);
89 drw->drawable = XCreatePixmap(drw->dpy, drw->root, w, h, DefaultDepth(drw->dpy, drw->screen));
90 }
91
92 void
93 drw_free(Drw *drw)
94 {
95 XFreePixmap(drw->dpy, drw->drawable);
96 XFreeGC(drw->dpy, drw->gc);
97 drw_fontset_free(drw->fonts);
98 free(drw);
99 }
100
101 /* This function is an implementation detail. Library users should use
102 * drw_fontset_create instead.
103 */
104 static Fnt *
105 xfont_create(Drw *drw, const char *fontname, FcPattern *fontpattern)
106 {
107 Fnt *font;
108 XftFont *xfont = NULL;
109 FcPattern *pattern = NULL;
110
111 if (fontname) {
112 /* Using the pattern found at font->xfont->pattern does not yield the
113 * same substitution results as using the pattern returned by
114 * FcNameParse; using the latter results in the desired fallback
115 * behaviour whereas the former just results in missing-character
116 * rectangles being drawn, at least with some fonts. */
117 if (!(xfont = XftFontOpenName(drw->dpy, drw->screen, fontname))) {
118 fprintf(stderr, "error, cannot load font from name: '%s'\n", fontname);
119 return NULL;
120 }
121 if (!(pattern = FcNameParse((FcChar8 *) fontname))) {
122 fprintf(stderr, "error, cannot parse font name to pattern: '%s'\n", fontname);
123 XftFontClose(drw->dpy, xfont);
124 return NULL;
125 }
126 } else if (fontpattern) {
127 if (!(xfont = XftFontOpenPattern(drw->dpy, fontpattern))) {
128 fprintf(stderr, "error, cannot load font from pattern.\n");
129 return NULL;
130 }
131 } else {
132 die("no font specified.");
133 }
134
135 font = ecalloc(1, sizeof(Fnt));
136 font->xfont = xfont;
137 font->pattern = pattern;
138 font->h = xfont->ascent + xfont->descent;
139 font->dpy = drw->dpy;
140
141 return font;
142 }
143
144 static void
145 xfont_free(Fnt *font)
146 {
147 if (!font)
148 return;
149 if (font->pattern)
150 FcPatternDestroy(font->pattern);
151 XftFontClose(font->dpy, font->xfont);
152 free(font);
153 }
154
155 Fnt*
156 drw_fontset_create(Drw* drw, const char *fonts[], size_t fontcount)
157 {
158 Fnt *cur, *ret = NULL;
159 size_t i;
160
161 if (!drw || !fonts)
162 return NULL;
163
164 for (i = 1; i <= fontcount; i++) {
165 if ((cur = xfont_create(drw, fonts[fontcount - i], NULL))) {
166 cur->next = ret;
167 ret = cur;
168 }
169 }
170 return (drw->fonts = ret);
171 }
172
173 void
174 drw_fontset_free(Fnt *font)
175 {
176 if (font) {
177 drw_fontset_free(font->next);
178 xfont_free(font);
179 }
180 }
181
182 void
183 drw_clr_create(Drw *drw, Clr *dest, const char *clrname)
184 {
185 if (!drw || !dest || !clrname)
186 return;
187
188 if (!XftColorAllocName(drw->dpy, DefaultVisual(drw->dpy, drw->screen),
189 DefaultColormap(drw->dpy, drw->screen),
190 clrname, dest))
191 die("error, cannot allocate color '%s'", clrname);
192 }
193
194 /* Wrapper to create color schemes. The caller has to call free(3) on the
195 * returned color scheme when done using it. */
196 Clr *
197 drw_scm_create(Drw *drw, const char *clrnames[], size_t clrcount)
198 {
199 size_t i;
200 Clr *ret;
201
202 /* need at least two colors for a scheme */
203 if (!drw || !clrnames || clrcount < 2 || !(ret = ecalloc(clrcount, sizeof(XftColor))))
204 return NULL;
205
206 for (i = 0; i < clrcount; i++)
207 drw_clr_create(drw, &ret[i], clrnames[i]);
208 return ret;
209 }
210
211 void
212 drw_setfontset(Drw *drw, Fnt *set)
213 {
214 if (drw)
215 drw->fonts = set;
216 }
217
218 void
219 drw_setscheme(Drw *drw, Clr *scm)
220 {
221 if (drw)
222 drw->scheme = scm;
223 }
224
225 void
226 drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int filled, int invert)
227 {
228 if (!drw || !drw->scheme)
229 return;
230 XSetForeground(drw->dpy, drw->gc, invert ? drw->scheme[ColBg].pixel : drw->scheme[ColFg].pixel);
231 if (filled)
232 XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
233 else
234 XDrawRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w - 1, h - 1);
235 }
236
237 int
238 drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lpad, const char *text, int invert)
239 {
240 int i, ty, ellipsis_x = 0;
241 unsigned int tmpw, ew, ellipsis_w = 0, ellipsis_len;
242 XftDraw *d = NULL;
243 Fnt *usedfont, *curfont, *nextfont;
244 int utf8strlen, utf8charlen, render = x || y || w || h;
245 long utf8codepoint = 0;
246 const char *utf8str;
247 FcCharSet *fccharset;
248 FcPattern *fcpattern;
249 FcPattern *match;
250 XftResult result;
251 int charexists = 0, overflow = 0;
252 /* keep track of a couple codepoints for which we have no match. */
253 enum { nomatches_len = 64 };
254 static struct { long codepoint[nomatches_len]; unsigned int idx; } nomatches;
255 static unsigned int ellipsis_width = 0;
256
257 if (!drw || (render && (!drw->scheme || !w)) || !text || !drw->fonts)
258 return 0;
259
260 if (!render) {
261 w = invert ? invert : ~invert;
262 } else {
263 XSetForeground(drw->dpy, drw->gc, drw->scheme[invert ? ColFg : ColBg].pixel);
264 XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
265 d = XftDrawCreate(drw->dpy, drw->drawable,
266 DefaultVisual(drw->dpy, drw->screen),
267 DefaultColormap(drw->dpy, drw->screen));
268 x += lpad;
269 w -= lpad;
270 }
271
272 usedfont = drw->fonts;
273 if (!ellipsis_width && render)
274 ellipsis_width = drw_fontset_getwidth(drw, "...");
275 while (1) {
276 ew = ellipsis_len = utf8strlen = 0;
277 utf8str = text;
278 nextfont = NULL;
279 while (*text) {
280 utf8charlen = utf8decode(text, &utf8codepoint, UTF_SIZ);
281 for (curfont = drw->fonts; curfont; curfont = curfont->next) {
282 charexists = charexists || XftCharExists(drw->dpy, curfont->xfont, utf8codepoint);
283 if (charexists) {
284 drw_font_getexts(curfont, text, utf8charlen, &tmpw, NULL);
285 if (ew + ellipsis_width <= w) {
286 /* keep track where the ellipsis still fits */
287 ellipsis_x = x + ew;
288 ellipsis_w = w - ew;
289 ellipsis_len = utf8strlen;
290 }
291
292 if (ew + tmpw > w) {
293 overflow = 1;
294 /* called from drw_fontset_getwidth_clamp():
295 * it wants the width AFTER the overflow
296 */
297 if (!render)
298 x += tmpw;
299 else
300 utf8strlen = ellipsis_len;
301 } else if (curfont == usedfont) {
302 utf8strlen += utf8charlen;
303 text += utf8charlen;
304 ew += tmpw;
305 } else {
306 nextfont = curfont;
307 }
308 break;
309 }
310 }
311
312 if (overflow || !charexists || nextfont)
313 break;
314 else
315 charexists = 0;
316 }
317
318 if (utf8strlen) {
319 if (render) {
320 ty = y + (h - usedfont->h) / 2 + usedfont->xfont->ascent;
321 XftDrawStringUtf8(d, &drw->scheme[invert ? ColBg : ColFg],
322 usedfont->xfont, x, ty, (XftChar8 *)utf8str, utf8strlen);
323 }
324 x += ew;
325 w -= ew;
326 }
327 if (render && overflow)
328 drw_text(drw, ellipsis_x, y, ellipsis_w, h, 0, "...", invert);
329
330 if (!*text || overflow) {
331 break;
332 } else if (nextfont) {
333 charexists = 0;
334 usedfont = nextfont;
335 } else {
336 /* Regardless of whether or not a fallback font is found, the
337 * character must be drawn. */
338 charexists = 1;
339
340 for (i = 0; i < nomatches_len; ++i) {
341 /* avoid calling XftFontMatch if we know we won't find a match */
342 if (utf8codepoint == nomatches.codepoint[i])
343 goto no_match;
344 }
345
346 fccharset = FcCharSetCreate();
347 FcCharSetAddChar(fccharset, utf8codepoint);
348
349 if (!drw->fonts->pattern) {
350 /* Refer to the comment in xfont_create for more information. */
351 die("the first font in the cache must be loaded from a font string.");
352 }
353
354 fcpattern = FcPatternDuplicate(drw->fonts->pattern);
355 FcPatternAddCharSet(fcpattern, FC_CHARSET, fccharset);
356 FcPatternAddBool(fcpattern, FC_SCALABLE, FcTrue);
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 nomatches.codepoint[++nomatches.idx % nomatches_len] = utf8codepoint;
374 no_match:
375 usedfont = drw->fonts;
376 }
377 }
378 }
379 }
380 if (d)
381 XftDrawDestroy(d);
382
383 return x + (render ? w : 0);
384 }
385
386 void
387 drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int h)
388 {
389 if (!drw)
390 return;
391
392 XCopyArea(drw->dpy, drw->drawable, win, drw->gc, x, y, w, h, x, y);
393 XSync(drw->dpy, False);
394 }
395
396 unsigned int
397 drw_fontset_getwidth(Drw *drw, const char *text)
398 {
399 if (!drw || !drw->fonts || !text)
400 return 0;
401 return drw_text(drw, 0, 0, 0, 0, 0, text, 0);
402 }
403
404 unsigned int
405 drw_fontset_getwidth_clamp(Drw *drw, const char *text, unsigned int n)
406 {
407 unsigned int tmp = 0;
408 if (drw && drw->fonts && text && n)
409 tmp = drw_text(drw, 0, 0, 0, 0, 0, text, n);
410 return MIN(n, tmp);
411 }
412
413 void
414 drw_font_getexts(Fnt *font, const char *text, unsigned int len, unsigned int *w, unsigned int *h)
415 {
416 XGlyphInfo ext;
417
418 if (!font || !text)
419 return;
420
421 XftTextExtentsUtf8(font->dpy, font->xfont, (XftChar8 *)text, len, &ext);
422 if (w)
423 *w = ext.xOff;
424 if (h)
425 *h = font->h;
426 }
427
428 Cur *
429 drw_cur_create(Drw *drw, int shape)
430 {
431 Cur *cur;
432
433 if (!drw || !(cur = ecalloc(1, sizeof(Cur))))
434 return NULL;
435
436 cur->cursor = XCreateFontCursor(drw->dpy, shape);
437
438 return cur;
439 }
440
441 void
442 drw_cur_free(Drw *drw, Cur *cursor)
443 {
444 if (!cursor)
445 return;
446
447 XFreeCursor(drw->dpy, cursor->cursor);
448 free(cursor);
449 }
450