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 free(drw);
99}
100
101/* This function is an implementation detail. Library users should use
102 * drw_fontset_create instead.
103 */
104static Fnt *
105xfont_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 /* Do not allow using color fonts. This is a workaround for a BadLength
136 * error from Xft with color glyphs. Modelled on the Xterm workaround. See
137 * https://bugzilla.redhat.com/show_bug.cgi?id=1498269
138 * https://lists.suckless.org/dev/1701/30932.html
139 * https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=916349
140 * and lots more all over the internet.
141 */
142 FcBool iscol;
143 if(FcPatternGetBool(xfont->pattern, FC_COLOR, 0, &iscol) == FcResultMatch && iscol) {
144 XftFontClose(drw->dpy, xfont);
145 return NULL;
146 }
147
148 font = ecalloc(1, sizeof(Fnt));
149 font->xfont = xfont;
150 font->pattern = pattern;
151 font->h = xfont->ascent + xfont->descent;
152 font->dpy = drw->dpy;
153
154 return font;
155}
156
157static void
158xfont_free(Fnt *font)
159{
160 if (!font)
161 return;
162 if (font->pattern)
163 FcPatternDestroy(font->pattern);
164 XftFontClose(font->dpy, font->xfont);
165 free(font);
166}
167
168Fnt*
169drw_fontset_create(Drw* drw, const char *fonts[], size_t fontcount)
170{
171 Fnt *cur, *ret = NULL;
172 size_t i;
173
174 if (!drw || !fonts)
175 return NULL;
176
177 for (i = 1; i <= fontcount; i++) {
178 if ((cur = xfont_create(drw, fonts[fontcount - i], NULL))) {
179 cur->next = ret;
180 ret = cur;
181 }
182 }
183 return (drw->fonts = ret);
184}
185
186void
187drw_fontset_free(Fnt *font)
188{
189 if (font) {
190 drw_fontset_free(font->next);
191 xfont_free(font);
192 }
193}
194
195void
196drw_clr_create(Drw *drw, Clr *dest, const char *clrname)
197{
198 if (!drw || !dest || !clrname)
199 return;
200
201 if (!XftColorAllocName(drw->dpy, DefaultVisual(drw->dpy, drw->screen),
202 DefaultColormap(drw->dpy, drw->screen),
203 clrname, dest))
204 die("error, cannot allocate color '%s'", clrname);
205}
206
207/* Wrapper to create color schemes. The caller has to call free(3) on the
208 * returned color scheme when done using it. */
209Clr *
210drw_scm_create(Drw *drw, const char *clrnames[], size_t clrcount)
211{
212 size_t i;
213 Clr *ret;
214
215 /* need at least two colors for a scheme */
216 if (!drw || !clrnames || clrcount < 2 || !(ret = ecalloc(clrcount, sizeof(XftColor))))
217 return NULL;
218
219 for (i = 0; i < clrcount; i++)
220 drw_clr_create(drw, &ret[i], clrnames[i]);
221 return ret;
222}
223
224void
225drw_setfontset(Drw *drw, Fnt *set)
226{
227 if (drw)
228 drw->fonts = set;
229}
230
231void
232drw_setscheme(Drw *drw, Clr *scm)
233{
234 if (drw)
235 drw->scheme = scm;
236}
237
238void
239drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int filled, int invert)
240{
241 if (!drw || !drw->scheme)
242 return;
243 XSetForeground(drw->dpy, drw->gc, invert ? drw->scheme[ColBg].pixel : drw->scheme[ColFg].pixel);
244 if (filled)
245 XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
246 else
247 XDrawRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w - 1, h - 1);
248}
249
250int
251drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lpad, const char *text, int invert)
252{
253 char buf[1024];
254 int ty;
255 unsigned int ew;
256 XftDraw *d = NULL;
257 Fnt *usedfont, *curfont, *nextfont;
258 size_t i, len;
259 int utf8strlen, utf8charlen, render = x || y || w || h;
260 long utf8codepoint = 0;
261 const char *utf8str;
262 FcCharSet *fccharset;
263 FcPattern *fcpattern;
264 FcPattern *match;
265 XftResult result;
266 int charexists = 0;
267
268 if (!drw || (render && !drw->scheme) || !text || !drw->fonts)
269 return 0;
270
271 if (!render) {
272 w = ~w;
273 } else {
274 XSetForeground(drw->dpy, drw->gc, drw->scheme[invert ? ColFg : ColBg].pixel);
275 XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
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 while (1) {
285 utf8strlen = 0;
286 utf8str = text;
287 nextfont = NULL;
288 while (*text) {
289 utf8charlen = utf8decode(text, &utf8codepoint, UTF_SIZ);
290 for (curfont = drw->fonts; curfont; curfont = curfont->next) {
291 charexists = charexists || XftCharExists(drw->dpy, curfont->xfont, utf8codepoint);
292 if (charexists) {
293 if (curfont == usedfont) {
294 utf8strlen += utf8charlen;
295 text += utf8charlen;
296 } else {
297 nextfont = curfont;
298 }
299 break;
300 }
301 }
302
303 if (!charexists || nextfont)
304 break;
305 else
306 charexists = 0;
307 }
308
309 if (utf8strlen) {
310 drw_font_getexts(usedfont, utf8str, utf8strlen, &ew, NULL);
311 /* shorten text if necessary */
312 for (len = MIN(utf8strlen, sizeof(buf) - 1); len && ew > w; len--)
313 drw_font_getexts(usedfont, utf8str, len, &ew, NULL);
314
315 if (len) {
316 memcpy(buf, utf8str, len);
317 buf[len] = '\0';
318 if (len < utf8strlen)
319 for (i = len; i && i > len - 3; buf[--i] = '.')
320 ; /* NOP */
321
322 if (render) {
323 ty = y + (h - usedfont->h) / 2 + usedfont->xfont->ascent;
324 XftDrawStringUtf8(d, &drw->scheme[invert ? ColBg : ColFg],
325 usedfont->xfont, x, ty, (XftChar8 *)buf, len);
326 }
327 x += ew;
328 w -= ew;
329 }
330 }
331
332 if (!*text) {
333 break;
334 } else if (nextfont) {
335 charexists = 0;
336 usedfont = nextfont;
337 } else {
338 /* Regardless of whether or not a fallback font is found, the
339 * character must be drawn. */
340 charexists = 1;
341
342 fccharset = FcCharSetCreate();
343 FcCharSetAddChar(fccharset, utf8codepoint);
344
345 if (!drw->fonts->pattern) {
346 /* Refer to the comment in xfont_create for more information. */
347 die("the first font in the cache must be loaded from a font string.");
348 }
349
350 fcpattern = FcPatternDuplicate(drw->fonts->pattern);
351 FcPatternAddCharSet(fcpattern, FC_CHARSET, fccharset);
352 FcPatternAddBool(fcpattern, FC_SCALABLE, FcTrue);
353 FcPatternAddBool(fcpattern, FC_COLOR, FcFalse);
354
355 FcConfigSubstitute(NULL, fcpattern, FcMatchPattern);
356 FcDefaultSubstitute(fcpattern);
357 match = XftFontMatch(drw->dpy, drw->screen, fcpattern, &result);
358
359 FcCharSetDestroy(fccharset);
360 FcPatternDestroy(fcpattern);
361
362 if (match) {
363 usedfont = xfont_create(drw, NULL, match);
364 if (usedfont && XftCharExists(drw->dpy, usedfont->xfont, utf8codepoint)) {
365 for (curfont = drw->fonts; curfont->next; curfont = curfont->next)
366 ; /* NOP */
367 curfont->next = usedfont;
368 } else {
369 xfont_free(usedfont);
370 usedfont = drw->fonts;
371 }
372 }
373 }
374 }
375 if (d)
376 XftDrawDestroy(d);
377
378 return x + (render ? w : 0);
379}
380
381void
382drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int h)
383{
384 if (!drw)
385 return;
386
387 XCopyArea(drw->dpy, drw->drawable, win, drw->gc, x, y, w, h, x, y);
388 XSync(drw->dpy, False);
389}
390
391unsigned int
392drw_fontset_getwidth(Drw *drw, const char *text)
393{
394 if (!drw || !drw->fonts || !text)
395 return 0;
396 return drw_text(drw, 0, 0, 0, 0, 0, text, 0);
397}
398
399void
400drw_font_getexts(Fnt *font, const char *text, unsigned int len, unsigned int *w, unsigned int *h)
401{
402 XGlyphInfo ext;
403
404 if (!font || !text)
405 return;
406
407 XftTextExtentsUtf8(font->dpy, font->xfont, (XftChar8 *)text, len, &ext);
408 if (w)
409 *w = ext.xOff;
410 if (h)
411 *h = font->h;
412}
413
414Cur *
415drw_cur_create(Drw *drw, int shape)
416{
417 Cur *cur;
418
419 if (!drw || !(cur = ecalloc(1, sizeof(Cur))))
420 return NULL;
421
422 cur->cursor = XCreateFontCursor(drw->dpy, shape);
423
424 return cur;
425}
426
427void
428drw_cur_free(Drw *drw, Cur *cursor)
429{
430 if (!cursor)
431 return;
432
433 XFreeCursor(drw->dpy, cursor->cursor);
434 free(cursor);
435}