drw.c (view raw)
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 free(drw);
99}
100
101/* This function is an implementation detail. Library users should use
102 * drw_fontset_create instead.
103 */
104static Fnt *
105xfont_create(Drw *drw, const char *fontname, FcPattern *fontpattern)
106{
107 Fnt *font;
108 XftFont *xfont = NULL;
109 FcPattern *pattern = NULL;
110
111 if (fontname) {
112 /* Using the pattern found at font->xfont->pattern does not yield the
113 * same substitution results as using the pattern returned by
114 * FcNameParse; using the latter results in the desired fallback
115 * behaviour whereas the former just results in missing-character
116 * rectangles being drawn, at least with some fonts. */
117 if (!(xfont = XftFontOpenName(drw->dpy, drw->screen, fontname))) {
118 fprintf(stderr, "error, cannot load font from name: '%s'\n", fontname);
119 return NULL;
120 }
121 if (!(pattern = FcNameParse((FcChar8 *) fontname))) {
122 fprintf(stderr, "error, cannot parse font name to pattern: '%s'\n", fontname);
123 XftFontClose(drw->dpy, xfont);
124 return NULL;
125 }
126 } else if (fontpattern) {
127 if (!(xfont = XftFontOpenPattern(drw->dpy, fontpattern))) {
128 fprintf(stderr, "error, cannot load font from pattern.\n");
129 return NULL;
130 }
131 } else {
132 die("no font specified.");
133 }
134
135 font = ecalloc(1, sizeof(Fnt));
136 font->xfont = xfont;
137 font->pattern = pattern;
138 font->h = xfont->ascent + xfont->descent;
139 font->dpy = drw->dpy;
140
141 return font;
142}
143
144static void
145xfont_free(Fnt *font)
146{
147 if (!font)
148 return;
149 if (font->pattern)
150 FcPatternDestroy(font->pattern);
151 XftFontClose(font->dpy, font->xfont);
152 free(font);
153}
154
155Fnt*
156drw_fontset_create(Drw* drw, const char *fonts[], size_t fontcount)
157{
158 Fnt *cur, *ret = NULL;
159 size_t i;
160
161 if (!drw || !fonts)
162 return NULL;
163
164 for (i = 1; i <= fontcount; i++) {
165 if ((cur = xfont_create(drw, fonts[fontcount - i], NULL))) {
166 cur->next = ret;
167 ret = cur;
168 }
169 }
170 return (drw->fonts = ret);
171}
172
173void
174drw_fontset_free(Fnt *font)
175{
176 if (font) {
177 drw_fontset_free(font->next);
178 xfont_free(font);
179 }
180}
181
182void
183drw_clr_create(Drw *drw, XftColor *dest, const char *clrname)
184{
185 if (!drw || !dest || !clrname)
186 return;
187
188 if (!XftColorAllocName(drw->dpy, DefaultVisual(drw->dpy, drw->screen),
189 DefaultColormap(drw->dpy, drw->screen),
190 clrname, dest))
191 die("error, cannot allocate color '%s'", clrname);
192}
193
194/* Wrapper to create color schemes. The caller has to call free(3) on the
195 * returned color scheme when done using it. */
196Scm
197drw_scm_create(Drw *drw, const char *clrnames[], size_t clrcount)
198{
199 size_t i;
200 Scm ret;
201
202 /* need at least two colors for a scheme */
203 if (!drw || !clrnames || clrcount < 2 || !(ret = ecalloc(clrcount, sizeof(XftColor))))
204 return NULL;
205
206 for (i = 0; i < clrcount; i++)
207 drw_clr_create(drw, &ret[i], clrnames[i]);
208 return ret;
209}
210
211void
212drw_setfontset(Drw *drw, Fnt *set)
213{
214 if (drw)
215 drw->fonts = set;
216}
217
218void
219drw_setscheme(Drw *drw, Scm scm)
220{
221 if (drw)
222 drw->scheme = scm;
223}
224
225void
226drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int filled, int invert)
227{
228 if (!drw || !drw->scheme)
229 return;
230 XSetForeground(drw->dpy, drw->gc, invert ? drw->scheme[ColBg].pixel : drw->scheme[ColFg].pixel);
231 if (filled)
232 XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
233 else
234 XDrawRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w - 1, h - 1);
235}
236
237int
238drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lpad, const char *text, int invert)
239{
240 char buf[1024];
241 int ty;
242 unsigned int ew;
243 XftDraw *d = NULL;
244 Fnt *usedfont, *curfont, *nextfont;
245 size_t i, len;
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;
254
255 if (!drw || (render && !drw->scheme) || !text || !drw->fonts)
256 return 0;
257
258 if (!render) {
259 w = ~w;
260 } else {
261 XSetForeground(drw->dpy, drw->gc, drw->scheme[invert ? ColFg : ColBg].pixel);
262 XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
263 d = XftDrawCreate(drw->dpy, drw->drawable,
264 DefaultVisual(drw->dpy, drw->screen),
265 DefaultColormap(drw->dpy, drw->screen));
266 x += lpad;
267 w -= lpad;
268 }
269
270 usedfont = drw->fonts;
271 while (1) {
272 utf8strlen = 0;
273 utf8str = text;
274 nextfont = NULL;
275 while (*text) {
276 utf8charlen = utf8decode(text, &utf8codepoint, UTF_SIZ);
277 for (curfont = drw->fonts; curfont; curfont = curfont->next) {
278 charexists = charexists || XftCharExists(drw->dpy, curfont->xfont, utf8codepoint);
279 if (charexists) {
280 if (curfont == usedfont) {
281 utf8strlen += utf8charlen;
282 text += utf8charlen;
283 } else {
284 nextfont = curfont;
285 }
286 break;
287 }
288 }
289
290 if (!charexists || nextfont)
291 break;
292 else
293 charexists = 0;
294 }
295
296 if (utf8strlen) {
297 drw_font_getexts(usedfont, utf8str, utf8strlen, &ew, NULL);
298 /* shorten text if necessary */
299 for (len = MIN(utf8strlen, sizeof(buf) - 1); len && ew > w; len--)
300 drw_font_getexts(usedfont, utf8str, len, &ew, NULL);
301
302 if (len) {
303 memcpy(buf, utf8str, len);
304 buf[len] = '\0';
305 if (len < utf8strlen)
306 for (i = len; i && i > len - 3; buf[--i] = '.')
307 ; /* NOP */
308
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 *)buf, len);
313 }
314 x += ew;
315 w -= ew;
316 }
317 }
318
319 if (!*text) {
320 break;
321 } else if (nextfont) {
322 charexists = 0;
323 usedfont = nextfont;
324 } else {
325 /* Regardless of whether or not a fallback font is found, the
326 * character must be drawn. */
327 charexists = 1;
328
329 fccharset = FcCharSetCreate();
330 FcCharSetAddChar(fccharset, utf8codepoint);
331
332 if (!drw->fonts->pattern) {
333 /* Refer to the comment in xfont_create for more information. */
334 die("the first font in the cache must be loaded from a font string.");
335 }
336
337 fcpattern = FcPatternDuplicate(drw->fonts->pattern);
338 FcPatternAddCharSet(fcpattern, FC_CHARSET, fccharset);
339 FcPatternAddBool(fcpattern, FC_SCALABLE, FcTrue);
340
341 FcConfigSubstitute(NULL, fcpattern, FcMatchPattern);
342 FcDefaultSubstitute(fcpattern);
343 match = XftFontMatch(drw->dpy, drw->screen, fcpattern, &result);
344
345 FcCharSetDestroy(fccharset);
346 FcPatternDestroy(fcpattern);
347
348 if (match) {
349 usedfont = xfont_create(drw, NULL, match);
350 if (usedfont && XftCharExists(drw->dpy, usedfont->xfont, utf8codepoint)) {
351 for (curfont = drw->fonts; curfont->next; curfont = curfont->next)
352 ; /* NOP */
353 curfont->next = usedfont;
354 } else {
355 xfont_free(usedfont);
356 usedfont = drw->fonts;
357 }
358 }
359 }
360 }
361 if (d)
362 XftDrawDestroy(d);
363
364 return x + (render ? w : 0);
365}
366
367void
368drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int h)
369{
370 if (!drw)
371 return;
372
373 XCopyArea(drw->dpy, drw->drawable, win, drw->gc, x, y, w, h, x, y);
374 XSync(drw->dpy, False);
375}
376
377unsigned int
378drw_fontset_getwidth(Drw *drw, const char *text)
379{
380 if (!drw || !drw->fonts || !text)
381 return 0;
382 return drw_text(drw, 0, 0, 0, 0, 0, text, 0);
383}
384
385void
386drw_font_getexts(Fnt *font, const char *text, unsigned int len, unsigned int *w, unsigned int *h)
387{
388 XGlyphInfo ext;
389
390 if (!font || !text)
391 return;
392
393 XftTextExtentsUtf8(font->dpy, font->xfont, (XftChar8 *)text, len, &ext);
394 if (w)
395 *w = ext.xOff;
396 if (h)
397 *h = font->h;
398}
399
400Cur *
401drw_cur_create(Drw *drw, int shape)
402{
403 Cur *cur;
404
405 if (!drw || !(cur = ecalloc(1, sizeof(Cur))))
406 return NULL;
407
408 cur->cursor = XCreateFontCursor(drw->dpy, shape);
409
410 return cur;
411}
412
413void
414drw_cur_free(Drw *drw, Cur *cursor)
415{
416 if (!cursor)
417 return;
418
419 XFreeCursor(drw->dpy, cursor->cursor);
420 free(cursor);
421}