drw.c (view raw)
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
14static const unsigned char utfbyte[UTF_SIZ + 1] = {0x80, 0, 0xC0, 0xE0, 0xF0};
15static const unsigned char utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
16static const long utfmin[UTF_SIZ + 1] = { 0, 0, 0x80, 0x800, 0x10000};
17static const long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
18
19static long
20utf8decodebyte(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
28static size_t
29utf8validate(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
38static size_t
39utf8decode(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
63Drw *
64drw_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
80void
81drw_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
93void
94drw_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 */
105static Fnt *
106xfont_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
158static void
159xfont_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
169Fnt*
170drw_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
187void
188drw_fontset_free(Fnt *font)
189{
190 if (font) {
191 drw_fontset_free(font->next);
192 xfont_free(font);
193 }
194}
195
196void
197drw_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. */
210Clr *
211drw_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
225void
226drw_setfontset(Drw *drw, Fnt *set)
227{
228 if (drw)
229 drw->fonts = set;
230}
231
232void
233drw_setscheme(Drw *drw, Clr *scm)
234{
235 if (drw)
236 drw->scheme = scm;
237}
238
239void
240drw_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
251int
252drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lpad, const char *text, int invert)
253{
254 char buf[1024];
255 int ty;
256 unsigned int ew;
257 XftDraw *d = NULL;
258 Fnt *usedfont, *curfont, *nextfont;
259 size_t i, len;
260 int utf8strlen, utf8charlen, render = x || y || w || h;
261 long utf8codepoint = 0;
262 const char *utf8str;
263 FcCharSet *fccharset;
264 FcPattern *fcpattern;
265 FcPattern *match;
266 XftResult result;
267 int charexists = 0;
268
269 if (!drw || (render && !drw->scheme) || !text || !drw->fonts)
270 return 0;
271
272 if (!render) {
273 w = ~w;
274 } else {
275 XSetForeground(drw->dpy, drw->gc, drw->scheme[invert ? ColFg : ColBg].pixel);
276 XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
277 d = XftDrawCreate(drw->dpy, drw->drawable,
278 DefaultVisual(drw->dpy, drw->screen),
279 DefaultColormap(drw->dpy, drw->screen));
280 x += lpad;
281 w -= lpad;
282 }
283
284 usedfont = drw->fonts;
285 while (1) {
286 utf8strlen = 0;
287 utf8str = text;
288 nextfont = NULL;
289 while (*text) {
290 utf8charlen = utf8decode(text, &utf8codepoint, UTF_SIZ);
291 for (curfont = drw->fonts; curfont; curfont = curfont->next) {
292 charexists = charexists || XftCharExists(drw->dpy, curfont->xfont, utf8codepoint);
293 if (charexists) {
294 if (curfont == usedfont) {
295 utf8strlen += utf8charlen;
296 text += utf8charlen;
297 } else {
298 nextfont = curfont;
299 }
300 break;
301 }
302 }
303
304 if (!charexists || nextfont)
305 break;
306 else
307 charexists = 0;
308 }
309
310 if (utf8strlen) {
311 drw_font_getexts(usedfont, utf8str, utf8strlen, &ew, NULL);
312 /* shorten text if necessary */
313 for (len = MIN(utf8strlen, sizeof(buf) - 1); len && ew > w; len--)
314 drw_font_getexts(usedfont, utf8str, len, &ew, NULL);
315
316 if (len) {
317 memcpy(buf, utf8str, len);
318 buf[len] = '\0';
319 if (len < utf8strlen)
320 for (i = len; i && i > len - 3; buf[--i] = '.')
321 ; /* NOP */
322
323 if (render) {
324 ty = y + (h - usedfont->h) / 2 + usedfont->xfont->ascent;
325 XftDrawStringUtf8(d, &drw->scheme[invert ? ColBg : ColFg],
326 usedfont->xfont, x, ty, (XftChar8 *)buf, len);
327 }
328 x += ew;
329 w -= ew;
330 }
331 }
332
333 if (!*text) {
334 break;
335 } else if (nextfont) {
336 charexists = 0;
337 usedfont = nextfont;
338 } else {
339 /* Regardless of whether or not a fallback font is found, the
340 * character must be drawn. */
341 charexists = 1;
342
343 fccharset = FcCharSetCreate();
344 FcCharSetAddChar(fccharset, utf8codepoint);
345
346 if (!drw->fonts->pattern) {
347 /* Refer to the comment in xfont_create for more information. */
348 die("the first font in the cache must be loaded from a font string.");
349 }
350
351 fcpattern = FcPatternDuplicate(drw->fonts->pattern);
352 FcPatternAddCharSet(fcpattern, FC_CHARSET, fccharset);
353 FcPatternAddBool(fcpattern, FC_SCALABLE, FcTrue);
354 FcPatternAddBool(fcpattern, FC_COLOR, FcFalse);
355
356 FcConfigSubstitute(NULL, fcpattern, FcMatchPattern);
357 FcDefaultSubstitute(fcpattern);
358 match = XftFontMatch(drw->dpy, drw->screen, fcpattern, &result);
359
360 FcCharSetDestroy(fccharset);
361 FcPatternDestroy(fcpattern);
362
363 if (match) {
364 usedfont = xfont_create(drw, NULL, match);
365 if (usedfont && XftCharExists(drw->dpy, usedfont->xfont, utf8codepoint)) {
366 for (curfont = drw->fonts; curfont->next; curfont = curfont->next)
367 ; /* NOP */
368 curfont->next = usedfont;
369 } else {
370 xfont_free(usedfont);
371 usedfont = drw->fonts;
372 }
373 }
374 }
375 }
376 if (d)
377 XftDrawDestroy(d);
378
379 return x + (render ? w : 0);
380}
381
382void
383drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int h)
384{
385 if (!drw)
386 return;
387
388 XCopyArea(drw->dpy, drw->drawable, win, drw->gc, x, y, w, h, x, y);
389 XSync(drw->dpy, False);
390}
391
392unsigned int
393drw_fontset_getwidth(Drw *drw, const char *text)
394{
395 if (!drw || !drw->fonts || !text)
396 return 0;
397 return drw_text(drw, 0, 0, 0, 0, 0, text, 0);
398}
399
400void
401drw_font_getexts(Fnt *font, const char *text, unsigned int len, unsigned int *w, unsigned int *h)
402{
403 XGlyphInfo ext;
404
405 if (!font || !text)
406 return;
407
408 XftTextExtentsUtf8(font->dpy, font->xfont, (XftChar8 *)text, len, &ext);
409 if (w)
410 *w = ext.xOff;
411 if (h)
412 *h = font->h;
413}
414
415Cur *
416drw_cur_create(Drw *drw, int shape)
417{
418 Cur *cur;
419
420 if (!drw || !(cur = ecalloc(1, sizeof(Cur))))
421 return NULL;
422
423 cur->cursor = XCreateFontCursor(drw->dpy, shape);
424
425 return cur;
426}
427
428void
429drw_cur_free(Drw *drw, Cur *cursor)
430{
431 if (!cursor)
432 return;
433
434 XFreeCursor(drw->dpy, cursor->cursor);
435 free(cursor);
436}