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5715edf5 AT |
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 | int i, ty, ellipsis_x = 0; | |
242 | unsigned int tmpw, ew, ellipsis_w = 0, ellipsis_len; | |
243 | XftDraw *d = NULL; | |
244 | Fnt *usedfont, *curfont, *nextfont; | |
245 | int utf8strlen, utf8charlen, render = x || y || w || h; | |
246 | long utf8codepoint = 0; | |
247 | const char *utf8str; | |
248 | FcCharSet *fccharset; | |
249 | FcPattern *fcpattern; | |
250 | FcPattern *match; | |
251 | XftResult result; | |
252 | int charexists = 0, overflow = 0; | |
253 | /* keep track of a couple codepoints for which we have no match. */ | |
254 | enum { nomatches_len = 64 }; | |
255 | static struct { long codepoint[nomatches_len]; unsigned int idx; } nomatches; | |
256 | static unsigned int ellipsis_width = 0; | |
257 | ||
258 | if (!drw || (render && (!drw->scheme || !w)) || !text || !drw->fonts) | |
259 | return 0; | |
260 | ||
261 | if (!render) { | |
262 | w = invert ? invert : ~invert; | |
263 | } else { | |
264 | XSetForeground(drw->dpy, drw->gc, drw->scheme[invert ? ColFg : ColBg].pixel); | |
265 | XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h); | |
266 | d = XftDrawCreate(drw->dpy, drw->drawable, | |
267 | DefaultVisual(drw->dpy, drw->screen), | |
268 | DefaultColormap(drw->dpy, drw->screen)); | |
269 | x += lpad; | |
270 | w -= lpad; | |
271 | } | |
272 | ||
273 | usedfont = drw->fonts; | |
274 | if (!ellipsis_width && render) | |
275 | ellipsis_width = drw_fontset_getwidth(drw, "..."); | |
276 | while (1) { | |
277 | ew = ellipsis_len = utf8strlen = 0; | |
278 | utf8str = text; | |
279 | nextfont = NULL; | |
280 | while (*text) { | |
281 | utf8charlen = utf8decode(text, &utf8codepoint, UTF_SIZ); | |
282 | for (curfont = drw->fonts; curfont; curfont = curfont->next) { | |
283 | charexists = charexists || XftCharExists(drw->dpy, curfont->xfont, utf8codepoint); | |
284 | if (charexists) { | |
285 | drw_font_getexts(curfont, text, utf8charlen, &tmpw, NULL); | |
286 | if (ew + ellipsis_width <= w) { | |
287 | /* keep track where the ellipsis still fits */ | |
288 | ellipsis_x = x + ew; | |
289 | ellipsis_w = w - ew; | |
290 | ellipsis_len = utf8strlen; | |
291 | } | |
292 | ||
293 | if (ew + tmpw > w) { | |
294 | overflow = 1; | |
295 | /* called from drw_fontset_getwidth_clamp(): | |
296 | * it wants the width AFTER the overflow | |
297 | */ | |
298 | if (!render) | |
299 | x += tmpw; | |
300 | else | |
301 | utf8strlen = ellipsis_len; | |
302 | } else if (curfont == usedfont) { | |
303 | utf8strlen += utf8charlen; | |
304 | text += utf8charlen; | |
305 | ew += tmpw; | |
306 | } else { | |
307 | nextfont = curfont; | |
308 | } | |
309 | break; | |
310 | } | |
311 | } | |
312 | ||
313 | if (overflow || !charexists || nextfont) | |
314 | break; | |
315 | else | |
316 | charexists = 0; | |
317 | } | |
318 | ||
319 | if (utf8strlen) { | |
320 | if (render) { | |
321 | ty = y + (h - usedfont->h) / 2 + usedfont->xfont->ascent; | |
322 | XftDrawStringUtf8(d, &drw->scheme[invert ? ColBg : ColFg], | |
323 | usedfont->xfont, x, ty, (XftChar8 *)utf8str, utf8strlen); | |
324 | } | |
325 | x += ew; | |
326 | w -= ew; | |
327 | } | |
328 | if (render && overflow) | |
329 | drw_text(drw, ellipsis_x, y, ellipsis_w, h, 0, "...", invert); | |
330 | ||
331 | if (!*text || overflow) { | |
332 | break; | |
333 | } else if (nextfont) { | |
334 | charexists = 0; | |
335 | usedfont = nextfont; | |
336 | } else { | |
337 | /* Regardless of whether or not a fallback font is found, the | |
338 | * character must be drawn. */ | |
339 | charexists = 1; | |
340 | ||
341 | for (i = 0; i < nomatches_len; ++i) { | |
342 | /* avoid calling XftFontMatch if we know we won't find a match */ | |
343 | if (utf8codepoint == nomatches.codepoint[i]) | |
344 | goto no_match; | |
345 | } | |
346 | ||
347 | fccharset = FcCharSetCreate(); | |
348 | FcCharSetAddChar(fccharset, utf8codepoint); | |
349 | ||
350 | if (!drw->fonts->pattern) { | |
351 | /* Refer to the comment in xfont_create for more information. */ | |
352 | die("the first font in the cache must be loaded from a font string."); | |
353 | } | |
354 | ||
355 | fcpattern = FcPatternDuplicate(drw->fonts->pattern); | |
356 | FcPatternAddCharSet(fcpattern, FC_CHARSET, fccharset); | |
357 | FcPatternAddBool(fcpattern, FC_SCALABLE, FcTrue); | |
358 | ||
359 | FcConfigSubstitute(NULL, fcpattern, FcMatchPattern); | |
360 | FcDefaultSubstitute(fcpattern); | |
361 | match = XftFontMatch(drw->dpy, drw->screen, fcpattern, &result); | |
362 | ||
363 | FcCharSetDestroy(fccharset); | |
364 | FcPatternDestroy(fcpattern); | |
365 | ||
366 | if (match) { | |
367 | usedfont = xfont_create(drw, NULL, match); | |
368 | if (usedfont && XftCharExists(drw->dpy, usedfont->xfont, utf8codepoint)) { | |
369 | for (curfont = drw->fonts; curfont->next; curfont = curfont->next) | |
370 | ; /* NOP */ | |
371 | curfont->next = usedfont; | |
372 | } else { | |
373 | xfont_free(usedfont); | |
374 | nomatches.codepoint[++nomatches.idx % nomatches_len] = utf8codepoint; | |
375 | no_match: | |
376 | usedfont = drw->fonts; | |
377 | } | |
378 | } | |
379 | } | |
380 | } | |
381 | if (d) | |
382 | XftDrawDestroy(d); | |
383 | ||
384 | return x + (render ? w : 0); | |
385 | } | |
386 | ||
387 | void | |
388 | drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int h) | |
389 | { | |
390 | if (!drw) | |
391 | return; | |
392 | ||
393 | XCopyArea(drw->dpy, drw->drawable, win, drw->gc, x, y, w, h, x, y); | |
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 | unsigned int | |
406 | drw_fontset_getwidth_clamp(Drw *drw, const char *text, unsigned int n) | |
407 | { | |
408 | unsigned int tmp = 0; | |
409 | if (drw && drw->fonts && text && n) | |
410 | tmp = drw_text(drw, 0, 0, 0, 0, 0, text, n); | |
411 | return MIN(n, tmp); | |
412 | } | |
413 | ||
414 | void | |
415 | drw_font_getexts(Fnt *font, const char *text, unsigned int len, unsigned int *w, unsigned int *h) | |
416 | { | |
417 | XGlyphInfo ext; | |
418 | ||
419 | if (!font || !text) | |
420 | return; | |
421 | ||
422 | XftTextExtentsUtf8(font->dpy, font->xfont, (XftChar8 *)text, len, &ext); | |
423 | if (w) | |
424 | *w = ext.xOff; | |
425 | if (h) | |
426 | *h = font->h; | |
427 | } | |
428 | ||
429 | Cur * | |
430 | drw_cur_create(Drw *drw, int shape) | |
431 | { | |
432 | Cur *cur; | |
433 | ||
434 | if (!drw || !(cur = ecalloc(1, sizeof(Cur)))) | |
435 | return NULL; | |
436 | ||
437 | cur->cursor = XCreateFontCursor(drw->dpy, shape); | |
438 | ||
439 | return cur; | |
440 | } | |
441 | ||
442 | void | |
443 | drw_cur_free(Drw *drw, Cur *cursor) | |
444 | { | |
445 | if (!cursor) | |
446 | return; | |
447 | ||
448 | XFreeCursor(drw->dpy, cursor->cursor); | |
449 | free(cursor); | |
450 | } |