drw.c (11286B) download
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
13static int
14utf8decode(const char *s_in, long *u, int *err)
15{
16 static const unsigned char lens[] = {
17 /* 0XXXX */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
18 /* 10XXX */ 0, 0, 0, 0, 0, 0, 0, 0, /* invalid */
19 /* 110XX */ 2, 2, 2, 2,
20 /* 1110X */ 3, 3,
21 /* 11110 */ 4,
22 /* 11111 */ 0, /* invalid */
23 };
24 static const unsigned char leading_mask[] = { 0x7F, 0x1F, 0x0F, 0x07 };
25 static const unsigned int overlong[] = { 0x0, 0x80, 0x0800, 0x10000 };
26
27 const unsigned char *s = (const unsigned char *)s_in;
28 int len = lens[*s >> 3];
29 *u = UTF_INVALID;
30 *err = 1;
31 if (len == 0)
32 return 1;
33
34 long cp = s[0] & leading_mask[len - 1];
35 for (int i = 1; i < len; ++i) {
36 if (s[i] == '\0' || (s[i] & 0xC0) != 0x80)
37 return i;
38 cp = (cp << 6) | (s[i] & 0x3F);
39 }
40 /* out of range, surrogate, overlong encoding */
41 if (cp > 0x10FFFF || (cp >> 11) == 0x1B || cp < overlong[len - 1])
42 return len;
43
44 *err = 0;
45 *u = cp;
46 return len;
47}
48
49Drw *
50drw_create(Display *dpy, int screen, Window root, unsigned int w, unsigned int h)
51{
52 Drw *drw = ecalloc(1, sizeof(Drw));
53
54 drw->dpy = dpy;
55 drw->screen = screen;
56 drw->root = root;
57 drw->w = w;
58 drw->h = h;
59 drw->drawable = XCreatePixmap(dpy, root, w, h, DefaultDepth(dpy, screen));
60 drw->gc = XCreateGC(dpy, root, 0, NULL);
61 XSetLineAttributes(dpy, drw->gc, 1, LineSolid, CapButt, JoinMiter);
62
63 return drw;
64}
65
66void
67drw_resize(Drw *drw, unsigned int w, unsigned int h)
68{
69 if (!drw)
70 return;
71
72 drw->w = w;
73 drw->h = h;
74 if (drw->drawable)
75 XFreePixmap(drw->dpy, drw->drawable);
76 drw->drawable = XCreatePixmap(drw->dpy, drw->root, w, h, DefaultDepth(drw->dpy, drw->screen));
77}
78
79void
80drw_free(Drw *drw)
81{
82 XFreePixmap(drw->dpy, drw->drawable);
83 XFreeGC(drw->dpy, drw->gc);
84 drw_fontset_free(drw->fonts);
85 free(drw);
86}
87
88/* This function is an implementation detail. Library users should use
89 * drw_fontset_create instead.
90 */
91static Fnt *
92xfont_create(Drw *drw, const char *fontname, FcPattern *fontpattern)
93{
94 Fnt *font;
95 XftFont *xfont = NULL;
96 FcPattern *pattern = NULL;
97
98 if (fontname) {
99 /* Using the pattern found at font->xfont->pattern does not yield the
100 * same substitution results as using the pattern returned by
101 * FcNameParse; using the latter results in the desired fallback
102 * behaviour whereas the former just results in missing-character
103 * rectangles being drawn, at least with some fonts. */
104 if (!(xfont = XftFontOpenName(drw->dpy, drw->screen, fontname))) {
105 fprintf(stderr, "error, cannot load font from name: '%s'\n", fontname);
106 return NULL;
107 }
108 if (!(pattern = FcNameParse((FcChar8 *) fontname))) {
109 fprintf(stderr, "error, cannot parse font name to pattern: '%s'\n", fontname);
110 XftFontClose(drw->dpy, xfont);
111 return NULL;
112 }
113 } else if (fontpattern) {
114 if (!(xfont = XftFontOpenPattern(drw->dpy, fontpattern))) {
115 fprintf(stderr, "error, cannot load font from pattern.\n");
116 return NULL;
117 }
118 } else {
119 die("no font specified.");
120 }
121
122 font = ecalloc(1, sizeof(Fnt));
123 font->xfont = xfont;
124 font->pattern = pattern;
125 font->h = xfont->ascent + xfont->descent;
126 font->dpy = drw->dpy;
127
128 return font;
129}
130
131static void
132xfont_free(Fnt *font)
133{
134 if (!font)
135 return;
136 if (font->pattern)
137 FcPatternDestroy(font->pattern);
138 XftFontClose(font->dpy, font->xfont);
139 free(font);
140}
141
142Fnt*
143drw_fontset_create(Drw* drw, const char *fonts[], size_t fontcount)
144{
145 Fnt *cur, *ret = NULL;
146 size_t i;
147
148 if (!drw || !fonts)
149 return NULL;
150
151 for (i = 1; i <= fontcount; i++) {
152 if ((cur = xfont_create(drw, fonts[fontcount - i], NULL))) {
153 cur->next = ret;
154 ret = cur;
155 }
156 }
157 return (drw->fonts = ret);
158}
159
160void
161drw_fontset_free(Fnt *font)
162{
163 if (font) {
164 drw_fontset_free(font->next);
165 xfont_free(font);
166 }
167}
168
169void
170drw_clr_create(Drw *drw, Clr *dest, const char *clrname)
171{
172 if (!drw || !dest || !clrname)
173 return;
174
175 if (!XftColorAllocName(drw->dpy, DefaultVisual(drw->dpy, drw->screen),
176 DefaultColormap(drw->dpy, drw->screen),
177 clrname, dest))
178 die("error, cannot allocate color '%s'", clrname);
179}
180
181/* Wrapper to create color schemes. The caller has to call free(3) on the
182 * returned color scheme when done using it. */
183Clr *
184drw_scm_create(Drw *drw, const char *clrnames[], size_t clrcount)
185{
186 size_t i;
187 Clr *ret;
188
189 /* need at least two colors for a scheme */
190 if (!drw || !clrnames || clrcount < 2 || !(ret = ecalloc(clrcount, sizeof(XftColor))))
191 return NULL;
192
193 for (i = 0; i < clrcount; i++)
194 drw_clr_create(drw, &ret[i], clrnames[i]);
195 return ret;
196}
197
198void
199drw_setfontset(Drw *drw, Fnt *set)
200{
201 if (drw)
202 drw->fonts = set;
203}
204
205void
206drw_setscheme(Drw *drw, Clr *scm)
207{
208 if (drw)
209 drw->scheme = scm;
210}
211
212void
213drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int filled, int invert)
214{
215 if (!drw || !drw->scheme)
216 return;
217 XSetForeground(drw->dpy, drw->gc, invert ? drw->scheme[ColBg].pixel : drw->scheme[ColFg].pixel);
218 if (filled)
219 XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
220 else
221 XDrawRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w - 1, h - 1);
222}
223
224int
225drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lpad, const char *text, int invert)
226{
227 int ty, ellipsis_x = 0;
228 unsigned int tmpw, ew, ellipsis_w = 0, ellipsis_len, hash, h0, h1;
229 XftDraw *d = NULL;
230 Fnt *usedfont, *curfont, *nextfont;
231 int utf8strlen, utf8charlen, utf8err, render = x || y || w || h;
232 long utf8codepoint = 0;
233 const char *utf8str;
234 FcCharSet *fccharset;
235 FcPattern *fcpattern;
236 FcPattern *match;
237 XftResult result;
238 int charexists = 0, overflow = 0;
239 /* keep track of a couple codepoints for which we have no match. */
240 static unsigned int nomatches[128], ellipsis_width, invalid_width;
241 static const char invalid[] = "�";
242
243 if (!drw || (render && (!drw->scheme || !w)) || !text || !drw->fonts)
244 return 0;
245
246 if (!render) {
247 w = invert ? invert : ~invert;
248 } else {
249 XSetForeground(drw->dpy, drw->gc, drw->scheme[invert ? ColFg : ColBg].pixel);
250 XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
251 if (w < lpad)
252 return x + w;
253 d = XftDrawCreate(drw->dpy, drw->drawable,
254 DefaultVisual(drw->dpy, drw->screen),
255 DefaultColormap(drw->dpy, drw->screen));
256 x += lpad;
257 w -= lpad;
258 }
259
260 usedfont = drw->fonts;
261 if (!ellipsis_width && render)
262 ellipsis_width = drw_fontset_getwidth(drw, "...");
263 if (!invalid_width && render)
264 invalid_width = drw_fontset_getwidth(drw, invalid);
265 while (1) {
266 ew = ellipsis_len = utf8err = utf8charlen = utf8strlen = 0;
267 utf8str = text;
268 nextfont = NULL;
269 while (*text) {
270 utf8charlen = utf8decode(text, &utf8codepoint, &utf8err);
271 for (curfont = drw->fonts; curfont; curfont = curfont->next) {
272 charexists = charexists || XftCharExists(drw->dpy, curfont->xfont, utf8codepoint);
273 if (charexists) {
274 drw_font_getexts(curfont, text, utf8charlen, &tmpw, NULL);
275 if (ew + ellipsis_width <= w) {
276 /* keep track where the ellipsis still fits */
277 ellipsis_x = x + ew;
278 ellipsis_w = w - ew;
279 ellipsis_len = utf8strlen;
280 }
281
282 if (ew + tmpw > w) {
283 overflow = 1;
284 /* called from drw_fontset_getwidth_clamp():
285 * it wants the width AFTER the overflow
286 */
287 if (!render)
288 x += tmpw;
289 else
290 utf8strlen = ellipsis_len;
291 } else if (curfont == usedfont) {
292 text += utf8charlen;
293 utf8strlen += utf8err ? 0 : utf8charlen;
294 ew += utf8err ? 0 : tmpw;
295 } else {
296 nextfont = curfont;
297 }
298 break;
299 }
300 }
301
302 if (overflow || !charexists || nextfont || utf8err)
303 break;
304 else
305 charexists = 0;
306 }
307
308 if (utf8strlen) {
309 if (render) {
310 ty = y + (h - usedfont->h) / 2 + usedfont->xfont->ascent;
311 XftDrawStringUtf8(d, &drw->scheme[invert ? ColBg : ColFg],
312 usedfont->xfont, x, ty, (XftChar8 *)utf8str, utf8strlen);
313 }
314 x += ew;
315 w -= ew;
316 }
317 if (utf8err && (!render || invalid_width < w)) {
318 if (render)
319 drw_text(drw, x, y, w, h, 0, invalid, invert);
320 x += invalid_width;
321 w -= invalid_width;
322 }
323 if (render && overflow)
324 drw_text(drw, ellipsis_x, y, ellipsis_w, h, 0, "...", invert);
325
326 if (!*text || overflow) {
327 break;
328 } else if (nextfont) {
329 charexists = 0;
330 usedfont = nextfont;
331 } else {
332 /* Regardless of whether or not a fallback font is found, the
333 * character must be drawn. */
334 charexists = 1;
335
336 hash = (unsigned int)utf8codepoint;
337 hash = ((hash >> 16) ^ hash) * 0x21F0AAAD;
338 hash = ((hash >> 15) ^ hash) * 0xD35A2D97;
339 h0 = ((hash >> 15) ^ hash) % LENGTH(nomatches);
340 h1 = (hash >> 17) % LENGTH(nomatches);
341 /* avoid expensive XftFontMatch call when we know we won't find a match */
342 if (nomatches[h0] == utf8codepoint || nomatches[h1] == utf8codepoint)
343 goto no_match;
344
345 fccharset = FcCharSetCreate();
346 FcCharSetAddChar(fccharset, utf8codepoint);
347
348 if (!drw->fonts->pattern) {
349 /* Refer to the comment in xfont_create for more information. */
350 die("the first font in the cache must be loaded from a font string.");
351 }
352
353 fcpattern = FcPatternDuplicate(drw->fonts->pattern);
354 FcPatternAddCharSet(fcpattern, FC_CHARSET, fccharset);
355 FcPatternAddBool(fcpattern, FC_SCALABLE, FcTrue);
356
357 FcConfigSubstitute(NULL, fcpattern, FcMatchPattern);
358 FcDefaultSubstitute(fcpattern);
359 match = XftFontMatch(drw->dpy, drw->screen, fcpattern, &result);
360
361 FcCharSetDestroy(fccharset);
362 FcPatternDestroy(fcpattern);
363
364 if (match) {
365 usedfont = xfont_create(drw, NULL, match);
366 if (usedfont && XftCharExists(drw->dpy, usedfont->xfont, utf8codepoint)) {
367 for (curfont = drw->fonts; curfont->next; curfont = curfont->next)
368 ; /* NOP */
369 curfont->next = usedfont;
370 } else {
371 xfont_free(usedfont);
372 nomatches[nomatches[h0] ? h1 : h0] = utf8codepoint;
373no_match:
374 usedfont = drw->fonts;
375 }
376 }
377 }
378 }
379 if (d)
380 XftDrawDestroy(d);
381
382 return x + (render ? w : 0);
383}
384
385void
386drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int h)
387{
388 if (!drw)
389 return;
390
391 XCopyArea(drw->dpy, drw->drawable, win, drw->gc, x, y, w, h, x, y);
392 XSync(drw->dpy, False);
393}
394
395unsigned int
396drw_fontset_getwidth(Drw *drw, const char *text)
397{
398 if (!drw || !drw->fonts || !text)
399 return 0;
400 return drw_text(drw, 0, 0, 0, 0, 0, text, 0);
401}
402
403unsigned int
404drw_fontset_getwidth_clamp(Drw *drw, const char *text, unsigned int n)
405{
406 unsigned int tmp = 0;
407 if (drw && drw->fonts && text && n)
408 tmp = drw_text(drw, 0, 0, 0, 0, 0, text, n);
409 return MIN(n, tmp);
410}
411
412void
413drw_font_getexts(Fnt *font, const char *text, unsigned int len, unsigned int *w, unsigned int *h)
414{
415 XGlyphInfo ext;
416
417 if (!font || !text)
418 return;
419
420 XftTextExtentsUtf8(font->dpy, font->xfont, (XftChar8 *)text, len, &ext);
421 if (w)
422 *w = ext.xOff;
423 if (h)
424 *h = font->h;
425}
426
427Cur *
428drw_cur_create(Drw *drw, int shape)
429{
430 Cur *cur;
431
432 if (!drw || !(cur = ecalloc(1, sizeof(Cur))))
433 return NULL;
434
435 cur->cursor = XCreateFontCursor(drw->dpy, shape);
436
437 return cur;
438}
439
440void
441drw_cur_free(Drw *drw, Cur *cursor)
442{
443 if (!cursor)
444 return;
445
446 XFreeCursor(drw->dpy, cursor->cursor);
447 free(cursor);
448}