Merge branch 'hide_vacant_tags'
[dwm.git] / drw.c
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, 0xE0, 0xF0};
15 static const unsigned char utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
16 static const long utfmin[UTF_SIZ + 1] = { 0, 0, 0x80, 0x800, 0x10000};
17 static const long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
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, 0xDFFF))
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, 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
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, DefaultDepth(drw->dpy, drw->screen));
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 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 font = ecalloc(1, sizeof(Fnt));
137 font->xfont = xfont;
138 font->pattern = pattern;
139 font->h = xfont->ascent + xfont->descent;
140 font->dpy = drw->dpy;
141
142 return font;
143 }
144
145 static void
146 xfont_free(Fnt *font)
147 {
148 if (!font)
149 return;
150 if (font->pattern)
151 FcPatternDestroy(font->pattern);
152 XftFontClose(font->dpy, font->xfont);
153 free(font);
154 }
155
156 Fnt*
157 drw_fontset_create(Drw* drw, const char *fonts[], size_t fontcount)
158 {
159 Fnt *cur, *ret = NULL;
160 size_t i;
161
162 if (!drw || !fonts)
163 return NULL;
164
165 for (i = 1; i <= fontcount; i++) {
166 if ((cur = xfont_create(drw, fonts[fontcount - i], NULL))) {
167 cur->next = ret;
168 ret = cur;
169 }
170 }
171 return (drw->fonts = ret);
172 }
173
174 void
175 drw_fontset_free(Fnt *font)
176 {
177 if (font) {
178 drw_fontset_free(font->next);
179 xfont_free(font);
180 }
181 }
182
183 void
184 drw_clr_create(Drw *drw, Clr *dest, const char *clrname)
185 {
186 if (!drw || !dest || !clrname)
187 return;
188
189 if (!XftColorAllocName(drw->dpy, DefaultVisual(drw->dpy, drw->screen),
190 DefaultColormap(drw->dpy, drw->screen),
191 clrname, dest))
192 die("error, cannot allocate color '%s'", clrname);
193 }
194
195 /* Wrapper to create color schemes. The caller has to call free(3) on the
196 * returned color scheme when done using it. */
197 Clr *
198 drw_scm_create(Drw *drw, const char *clrnames[], size_t clrcount)
199 {
200 size_t i;
201 Clr *ret;
202
203 /* need at least two colors for a scheme */
204 if (!drw || !clrnames || clrcount < 2 || !(ret = ecalloc(clrcount, sizeof(XftColor))))
205 return NULL;
206
207 for (i = 0; i < clrcount; i++)
208 drw_clr_create(drw, &ret[i], clrnames[i]);
209 return ret;
210 }
211
212 void
213 drw_setfontset(Drw *drw, Fnt *set)
214 {
215 if (drw)
216 drw->fonts = set;
217 }
218
219 void
220 drw_setscheme(Drw *drw, Clr *scm)
221 {
222 if (drw)
223 drw->scheme = scm;
224 }
225
226 void
227 drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int filled, int invert)
228 {
229 if (!drw || !drw->scheme)
230 return;
231 XSetForeground(drw->dpy, drw->gc, invert ? drw->scheme[ColBg].pixel : drw->scheme[ColFg].pixel);
232 if (filled)
233 XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
234 else
235 XDrawRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w - 1, h - 1);
236 }
237
238 int
239 drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lpad, const char *text, int invert)
240 {
241 char buf[1024];
242 int ty;
243 unsigned int ew;
244 XftDraw *d = NULL;
245 Fnt *usedfont, *curfont, *nextfont;
246 size_t i, len;
247 int utf8strlen, utf8charlen, render = x || y || w || h;
248 long utf8codepoint = 0;
249 const char *utf8str;
250 FcCharSet *fccharset;
251 FcPattern *fcpattern;
252 FcPattern *match;
253 XftResult result;
254 int charexists = 0;
255
256 if (!drw || (render && !drw->scheme) || !text || !drw->fonts)
257 return 0;
258
259 if (!render) {
260 w = ~w;
261 } else {
262 XSetForeground(drw->dpy, drw->gc, drw->scheme[invert ? ColFg : ColBg].pixel);
263 XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
264 d = XftDrawCreate(drw->dpy, drw->drawable,
265 DefaultVisual(drw->dpy, drw->screen),
266 DefaultColormap(drw->dpy, drw->screen));
267 x += lpad;
268 w -= lpad;
269 }
270
271 usedfont = drw->fonts;
272 while (1) {
273 utf8strlen = 0;
274 utf8str = text;
275 nextfont = NULL;
276 while (*text) {
277 utf8charlen = utf8decode(text, &utf8codepoint, UTF_SIZ);
278 for (curfont = drw->fonts; curfont; curfont = curfont->next) {
279 charexists = charexists || XftCharExists(drw->dpy, curfont->xfont, utf8codepoint);
280 if (charexists) {
281 if (curfont == usedfont) {
282 utf8strlen += utf8charlen;
283 text += utf8charlen;
284 } else {
285 nextfont = curfont;
286 }
287 break;
288 }
289 }
290
291 if (!charexists || nextfont)
292 break;
293 else
294 charexists = 0;
295 }
296
297 if (utf8strlen) {
298 drw_font_getexts(usedfont, utf8str, utf8strlen, &ew, NULL);
299 /* shorten text if necessary */
300 for (len = MIN(utf8strlen, sizeof(buf) - 1); len && ew > w; len--)
301 drw_font_getexts(usedfont, utf8str, len, &ew, NULL);
302
303 if (len) {
304 memcpy(buf, utf8str, len);
305 buf[len] = '\0';
306 if (len < utf8strlen)
307 for (i = len; i && i > len - 3; buf[--i] = '.')
308 ; /* NOP */
309
310 if (render) {
311 ty = y + (h - usedfont->h) / 2 + usedfont->xfont->ascent;
312 XftDrawStringUtf8(d, &drw->scheme[invert ? ColBg : ColFg],
313 usedfont->xfont, x, ty, (XftChar8 *)buf, len);
314 }
315 x += ew;
316 w -= ew;
317 }
318 }
319
320 if (!*text) {
321 break;
322 } else if (nextfont) {
323 charexists = 0;
324 usedfont = nextfont;
325 } else {
326 /* Regardless of whether or not a fallback font is found, the
327 * character must be drawn. */
328 charexists = 1;
329
330 fccharset = FcCharSetCreate();
331 FcCharSetAddChar(fccharset, utf8codepoint);
332
333 if (!drw->fonts->pattern) {
334 /* Refer to the comment in xfont_create for more information. */
335 die("the first font in the cache must be loaded from a font string.");
336 }
337
338 fcpattern = FcPatternDuplicate(drw->fonts->pattern);
339 FcPatternAddCharSet(fcpattern, FC_CHARSET, fccharset);
340 FcPatternAddBool(fcpattern, FC_SCALABLE, FcTrue);
341 FcPatternAddBool(fcpattern, FC_COLOR, FcFalse);
342
343 FcConfigSubstitute(NULL, fcpattern, FcMatchPattern);
344 FcDefaultSubstitute(fcpattern);
345 match = XftFontMatch(drw->dpy, drw->screen, fcpattern, &result);
346
347 FcCharSetDestroy(fccharset);
348 FcPatternDestroy(fcpattern);
349
350 if (match) {
351 usedfont = xfont_create(drw, NULL, match);
352 if (usedfont && XftCharExists(drw->dpy, usedfont->xfont, utf8codepoint)) {
353 for (curfont = drw->fonts; curfont->next; curfont = curfont->next)
354 ; /* NOP */
355 curfont->next = usedfont;
356 } else {
357 xfont_free(usedfont);
358 usedfont = drw->fonts;
359 }
360 }
361 }
362 }
363 if (d)
364 XftDrawDestroy(d);
365
366 return x + (render ? w : 0);
367 }
368
369 void
370 drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int h)
371 {
372 if (!drw)
373 return;
374
375 XCopyArea(drw->dpy, drw->drawable, win, drw->gc, x, y, w, h, x, y);
376 XSync(drw->dpy, False);
377 }
378
379 unsigned int
380 drw_fontset_getwidth(Drw *drw, const char *text)
381 {
382 if (!drw || !drw->fonts || !text)
383 return 0;
384 return drw_text(drw, 0, 0, 0, 0, 0, text, 0);
385 }
386
387 void
388 drw_font_getexts(Fnt *font, const char *text, unsigned int len, unsigned int *w, unsigned int *h)
389 {
390 XGlyphInfo ext;
391
392 if (!font || !text)
393 return;
394
395 XftTextExtentsUtf8(font->dpy, font->xfont, (XftChar8 *)text, len, &ext);
396 if (w)
397 *w = ext.xOff;
398 if (h)
399 *h = font->h;
400 }
401
402 Cur *
403 drw_cur_create(Drw *drw, int shape)
404 {
405 Cur *cur;
406
407 if (!drw || !(cur = ecalloc(1, sizeof(Cur))))
408 return NULL;
409
410 cur->cursor = XCreateFontCursor(drw->dpy, shape);
411
412 return cur;
413 }
414
415 void
416 drw_cur_free(Drw *drw, Cur *cursor)
417 {
418 if (!cursor)
419 return;
420
421 XFreeCursor(drw->dpy, cursor->cursor);
422 free(cursor);
423 }