drw.c - svkbd - simple virtual keyboard | |
git clone git://git.suckless.org/svkbd | |
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drw.c (10278B) | |
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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, 0xE… | |
15 static const unsigned char utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF… | |
16 static const long utfmin[UTF_SIZ + 1] = { 0, 0, 0x80, 0x800, … | |
17 static const long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, … | |
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, 0x… | |
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, unsign… | |
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,… | |
74 drw->gc = XCreateGC(dpy, root, 0, NULL); | |
75 XSetLineAttributes(dpy, drw->gc, 1, LineSolid, CapButt, JoinMite… | |
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, Default… | |
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 … | |
114 * same substitution results as using the pattern return… | |
115 * FcNameParse; using the latter results in the desired … | |
116 * behaviour whereas the former just results in missing-… | |
117 * rectangles being drawn, at least with some fonts. */ | |
118 if (!(xfont = XftFontOpenName(drw->dpy, drw->screen, fon… | |
119 fprintf(stderr, "error, cannot load font from na… | |
120 return NULL; | |
121 } | |
122 if (!(pattern = FcNameParse((FcChar8 *) fontname))) { | |
123 fprintf(stderr, "error, cannot parse font name t… | |
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 pa… | |
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 Ba… | |
137 * error from Xft with color glyphs. Modelled on the Xterm worka… | |
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) == FcRe… | |
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 | |
158 static void | |
159 xfont_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 | |
169 Fnt* | |
170 drw_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 | |
187 void | |
188 drw_fontset_free(Fnt *font) | |
189 { | |
190 if (font) { | |
191 drw_fontset_free(font->next); | |
192 xfont_free(font); | |
193 } | |
194 } | |
195 | |
196 void | |
197 drw_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->sc… | |
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. */ | |
210 Clr * | |
211 drw_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(clrcoun… | |
218 die("error, cannot create color scheme (drw=%d) (clrcoun… | |
219 | |
220 for (i = 0; i < clrcount; i++) | |
221 drw_clr_create(drw, &ret[i], clrnames[i]); | |
222 return ret; | |
223 } | |
224 | |
225 void | |
226 drw_setfontset(Drw *drw, Fnt *set) | |
227 { | |
228 if (drw) | |
229 drw->fonts = set; | |
230 } | |
231 | |
232 void | |
233 drw_setscheme(Drw *drw, Clr *scm) | |
234 { | |
235 if (drw) | |
236 drw->scheme = scm; | |
237 } | |
238 | |
239 void | |
240 drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int fil… | |
241 { | |
242 if (!drw || !drw->scheme) | |
243 return; | |
244 XSetForeground(drw->dpy, drw->gc, invert ? drw->scheme[ColBg].pi… | |
245 if (filled) | |
246 XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w… | |
247 else | |
248 XDrawRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w… | |
249 } | |
250 | |
251 int | |
252 drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigne… | |
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 ? C… | |
276 XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w… | |
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, U… | |
291 for (curfont = drw->fonts; curfont; curfont = cu… | |
292 charexists = charexists || XftCharExists… | |
293 if (charexists) { | |
294 if (curfont == usedfont) { | |
295 utf8strlen += utf8charle… | |
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, … | |
312 /* shorten text if necessary */ | |
313 for (len = MIN(utf8strlen, sizeof(buf) - 1); len… | |
314 drw_font_getexts(usedfont, utf8str, len,… | |
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; … | |
321 ; /* NOP */ | |
322 | |
323 if (render) { | |
324 ty = y + (h - usedfont->h) / 2 +… | |
325 XftDrawStringUtf8(d, &drw->schem… | |
326 usedfont->xfon… | |
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 … | |
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 … | |
348 die("the first font in the cache must be… | |
349 } | |
350 | |
351 fcpattern = FcPatternDuplicate(drw->fonts->patte… | |
352 FcPatternAddCharSet(fcpattern, FC_CHARSET, fccha… | |
353 FcPatternAddBool(fcpattern, FC_SCALABLE, FcTrue); | |
354 FcPatternAddBool(fcpattern, FC_COLOR, FcFalse); | |
355 | |
356 FcConfigSubstitute(NULL, fcpattern, FcMatchPatte… | |
357 FcDefaultSubstitute(fcpattern); | |
358 match = XftFontMatch(drw->dpy, drw->screen, fcpa… | |
359 | |
360 FcCharSetDestroy(fccharset); | |
361 FcPatternDestroy(fcpattern); | |
362 | |
363 if (match) { | |
364 usedfont = xfont_create(drw, NULL, match… | |
365 if (usedfont && XftCharExists(drw->dpy, … | |
366 for (curfont = drw->fonts; curfo… | |
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 | |
382 void | |
383 drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int… | |
384 { | |
385 if (!drw) | |
386 return; | |
387 | |
388 XCopyArea(drw->dpy, drw->drawable, win, drw->gc, x, y, w, h, x, … | |
389 } | |
390 | |
391 void | |
392 drw_sync(Drw *drw) | |
393 { | |
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 void | |
406 drw_font_getexts(Fnt *font, const char *text, unsigned int len, unsigned… | |
407 { | |
408 XGlyphInfo ext; | |
409 | |
410 if (!font || !text) | |
411 return; | |
412 | |
413 XftTextExtentsUtf8(font->dpy, font->xfont, (XftChar8 *)text, len… | |
414 if (w) | |
415 *w = ext.xOff; | |
416 if (h) | |
417 *h = font->h; | |
418 } |