dwm

The dwm window manager with some custom modifications

git clone https://git.8pit.net/dwm.git

  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, 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
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}
194
195/* Wrapper to create color schemes. The caller has to call free(3) on the
196 * returned color scheme when done using it. */
197Clr *
198drw_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
212void
213drw_setfontset(Drw *drw, Fnt *set)
214{
215	if (drw)
216		drw->fonts = set;
217}
218
219void
220drw_setscheme(Drw *drw, Clr *scm)
221{
222	if (drw)
223		drw->scheme = scm;
224}
225
226void
227drw_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
238int
239drw_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;
375no_match:
376					usedfont = drw->fonts;
377				}
378			}
379		}
380	}
381	if (d)
382		XftDrawDestroy(d);
383
384	return x + (render ? w : 0);
385}
386
387void
388drw_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
397unsigned int
398drw_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
405unsigned int
406drw_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
414void
415drw_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
429Cur *
430drw_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
442void
443drw_cur_free(Drw *drw, Cur *cursor)
444{
445	if (!cursor)
446		return;
447
448	XFreeCursor(drw->dpy, cursor->cursor);
449	free(cursor);
450}