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
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 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
145static void
146xfont_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
156Fnt*
157drw_fontset_create(Drw* drw, 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
174void
175drw_fontset_free(Fnt *font)
176{
177 if (font) {
178 drw_fontset_free(font->next);
179 xfont_free(font);
180 }
181}
182
183void
184drw_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 dest->pixel |= 0xff << 24;
194}
195
196/* Wrapper to create color schemes. The caller has to call free(3) on the
197 * returned color scheme when done using it. */
198Clr *
199drw_scm_create(Drw *drw, char *clrnames[], size_t clrcount)
200{
201 size_t i;
202 Clr *ret;
203
204 /* need at least two colors for a scheme */
205 if (!drw || !clrnames || clrcount < 2 || !(ret = ecalloc(clrcount, sizeof(XftColor))))
206 return NULL;
207
208 for (i = 0; i < clrcount; i++)
209 drw_clr_create(drw, &ret[i], clrnames[i]);
210 return ret;
211}
212
213void
214drw_setfontset(Drw *drw, Fnt *set)
215{
216 if (drw)
217 drw->fonts = set;
218}
219
220void
221drw_setscheme(Drw *drw, Clr *scm)
222{
223 if (drw)
224 drw->scheme = scm;
225}
226
227void
228drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int filled, enum color_mode mode)
229{
230 if (!drw || !drw->scheme)
231 return;
232 XSetForeground(drw->dpy, drw->gc, drw->scheme[mode].pixel);
233 if (filled)
234 XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
235 else
236 XDrawRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w - 1, h - 1);
237}
238
239int
240drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lpad, const char *text, int invert)
241{
242 int i, ty, ellipsis_x = 0;
243 unsigned int tmpw, ew, ellipsis_w = 0, ellipsis_len;
244 XftDraw *d = NULL;
245 Fnt *usedfont, *curfont, *nextfont;
246 int utf8strlen, utf8charlen, render = x || y || w || h;
247 long utf8codepoint = 0;
248 const char *utf8str;
249 FcCharSet *fccharset;
250 FcPattern *fcpattern;
251 FcPattern *match;
252 XftResult result;
253 int charexists = 0, overflow = 0;
254 /* keep track of a couple codepoints for which we have no match. */
255 enum { nomatches_len = 64 };
256 static struct { long codepoint[nomatches_len]; unsigned int idx; } nomatches;
257 static unsigned int ellipsis_width = 0;
258
259 if (!drw || (render && (!drw->scheme || !w)) || !text || !drw->fonts)
260 return 0;
261
262 if (!render) {
263 w = invert ? invert : ~invert;
264 } else {
265 XSetForeground(drw->dpy, drw->gc, drw->scheme[invert ? ColFg : ColBg].pixel);
266 XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
267 d = XftDrawCreate(drw->dpy, drw->drawable,
268 DefaultVisual(drw->dpy, drw->screen),
269 DefaultColormap(drw->dpy, drw->screen));
270 x += lpad;
271 w -= lpad;
272 }
273
274 usedfont = drw->fonts;
275 if (!ellipsis_width && render)
276 ellipsis_width = drw_fontset_getwidth(drw, "...");
277 while (1) {
278 ew = ellipsis_len = utf8strlen = 0;
279 utf8str = text;
280 nextfont = NULL;
281 while (*text) {
282 utf8charlen = utf8decode(text, &utf8codepoint, UTF_SIZ);
283 for (curfont = drw->fonts; curfont; curfont = curfont->next) {
284 charexists = charexists || XftCharExists(drw->dpy, curfont->xfont, utf8codepoint);
285 if (charexists) {
286 drw_font_getexts(curfont, text, utf8charlen, &tmpw, NULL);
287 if (ew + ellipsis_width <= w) {
288 /* keep track where the ellipsis still fits */
289 ellipsis_x = x + ew;
290 ellipsis_w = w - ew;
291 ellipsis_len = utf8strlen;
292 }
293
294 if (ew + tmpw > w) {
295 overflow = 1;
296 /* called from drw_fontset_getwidth_clamp():
297 * it wants the width AFTER the overflow
298 */
299 if (!render)
300 x += tmpw;
301 else
302 utf8strlen = ellipsis_len;
303 } else if (curfont == usedfont) {
304 utf8strlen += utf8charlen;
305 text += utf8charlen;
306 ew += tmpw;
307 } else {
308 nextfont = curfont;
309 }
310 break;
311 }
312 }
313
314 if (overflow || !charexists || nextfont)
315 break;
316 else
317 charexists = 0;
318 }
319
320 if (utf8strlen) {
321 if (render) {
322 ty = y + (h - usedfont->h) / 2 + usedfont->xfont->ascent;
323 XftDrawStringUtf8(d, &drw->scheme[invert ? ColBg : ColFg],
324 usedfont->xfont, x, ty, (XftChar8 *)utf8str, utf8strlen);
325 }
326 x += ew;
327 w -= ew;
328 }
329 if (render && overflow)
330 drw_text(drw, ellipsis_x, y, ellipsis_w, h, 0, "...", invert);
331
332 if (!*text || overflow) {
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 for (i = 0; i < nomatches_len; ++i) {
343 /* avoid calling XftFontMatch if we know we won't find a match */
344 if (utf8codepoint == nomatches.codepoint[i])
345 goto no_match;
346 }
347
348 fccharset = FcCharSetCreate();
349 FcCharSetAddChar(fccharset, utf8codepoint);
350
351 if (!drw->fonts->pattern) {
352 /* Refer to the comment in xfont_create for more information. */
353 die("the first font in the cache must be loaded from a font string.");
354 }
355
356 fcpattern = FcPatternDuplicate(drw->fonts->pattern);
357 FcPatternAddCharSet(fcpattern, FC_CHARSET, fccharset);
358 FcPatternAddBool(fcpattern, FC_SCALABLE, FcTrue);
359
360 FcConfigSubstitute(NULL, fcpattern, FcMatchPattern);
361 FcDefaultSubstitute(fcpattern);
362 match = XftFontMatch(drw->dpy, drw->screen, fcpattern, &result);
363
364 FcCharSetDestroy(fccharset);
365 FcPatternDestroy(fcpattern);
366
367 if (match) {
368 usedfont = xfont_create(drw, NULL, match);
369 if (usedfont && XftCharExists(drw->dpy, usedfont->xfont, utf8codepoint)) {
370 for (curfont = drw->fonts; curfont->next; curfont = curfont->next)
371 ; /* NOP */
372 curfont->next = usedfont;
373 } else {
374 xfont_free(usedfont);
375 nomatches.codepoint[++nomatches.idx % nomatches_len] = utf8codepoint;
376no_match:
377 usedfont = drw->fonts;
378 }
379 }
380 }
381 }
382 if (d)
383 XftDrawDestroy(d);
384
385 return x + (render ? w : 0);
386}
387
388void
389drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int h)
390{
391 if (!drw)
392 return;
393
394 XCopyArea(drw->dpy, drw->drawable, win, drw->gc, x, y, w, h, x, y);
395 XSync(drw->dpy, False);
396}
397
398unsigned int
399drw_fontset_getwidth(Drw *drw, const char *text)
400{
401 if (!drw || !drw->fonts || !text)
402 return 0;
403 return drw_text(drw, 0, 0, 0, 0, 0, text, 0);
404}
405
406unsigned int
407drw_fontset_getwidth_clamp(Drw *drw, const char *text, unsigned int n)
408{
409 unsigned int tmp = 0;
410 if (drw && drw->fonts && text && n)
411 tmp = drw_text(drw, 0, 0, 0, 0, 0, text, n);
412 return MIN(n, tmp);
413}
414
415void
416drw_font_getexts(Fnt *font, const char *text, unsigned int len, unsigned int *w, unsigned int *h)
417{
418 XGlyphInfo ext;
419
420 if (!font || !text)
421 return;
422
423 XftTextExtentsUtf8(font->dpy, font->xfont, (XftChar8 *)text, len, &ext);
424 if (w)
425 *w = ext.xOff;
426 if (h)
427 *h = font->h;
428}
429
430Cur *
431drw_cur_create(Drw *drw, int shape)
432{
433 Cur *cur;
434
435 if (!drw || !(cur = ecalloc(1, sizeof(Cur))))
436 return NULL;
437
438 cur->cursor = XCreateFontCursor(drw->dpy, shape);
439
440 return cur;
441}
442
443void
444drw_cur_free(Drw *drw, Cur *cursor)
445{
446 if (!cursor)
447 return;
448
449 XFreeCursor(drw->dpy, cursor->cursor);
450 free(cursor);
451}
