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drw.c 11.3 K raw

/* See LICENSE file for copyright and license details. */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <X11/Xlib.h>
#include <X11/Xft/Xft.h>

#include "drw.h"
#include "util.h"

#define UTF_INVALID 0xFFFD

static int
utf8decode(const char *s_in, long *u, int *err)
{
	static const unsigned char lens[] = {
		/* 0XXXX */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
		/* 10XXX */ 0, 0, 0, 0, 0, 0, 0, 0,  /* invalid */
		/* 110XX */ 2, 2, 2, 2,
		/* 1110X */ 3, 3,
		/* 11110 */ 4,
		/* 11111 */ 0,  /* invalid */
	};
	static const unsigned char leading_mask[] = { 0x7F, 0x1F, 0x0F, 0x07 };
	static const unsigned int overlong[] = { 0x0, 0x80, 0x0800, 0x10000 };

	const unsigned char *s = (const unsigned char *)s_in;
	int len = lens[*s >> 3];
	*u = UTF_INVALID;
	*err = 1;
	if (len == 0)
		return 1;

	long cp = s[0] & leading_mask[len - 1];
	for (int i = 1; i < len; ++i) {
		if (s[i] == '\0' || (s[i] & 0xC0) != 0x80)
			return i;
		cp = (cp << 6) | (s[i] & 0x3F);
	}
	/* out of range, surrogate, overlong encoding */
	if (cp > 0x10FFFF || (cp >> 11) == 0x1B || cp < overlong[len - 1])
		return len;

	*err = 0;
	*u = cp;
	return len;
}

Drw *
drw_create(Display *dpy, int screen, Window root, unsigned int w, unsigned int h)
{
	Drw *drw = ecalloc(1, sizeof(Drw));

	drw->dpy = dpy;
	drw->screen = screen;
	drw->root = root;
	drw->w = w;
	drw->h = h;
	drw->drawable = XCreatePixmap(dpy, root, w, h, DefaultDepth(dpy, screen));
	drw->gc = XCreateGC(dpy, root, 0, NULL);
	XSetLineAttributes(dpy, drw->gc, 1, LineSolid, CapButt, JoinMiter);

	return drw;
}

void
drw_resize(Drw *drw, unsigned int w, unsigned int h)
{
	if (!drw)
		return;

	drw->w = w;
	drw->h = h;
	if (drw->drawable)
		XFreePixmap(drw->dpy, drw->drawable);
	drw->drawable = XCreatePixmap(drw->dpy, drw->root, w, h, DefaultDepth(drw->dpy, drw->screen));
}

void
drw_free(Drw *drw)
{
	XFreePixmap(drw->dpy, drw->drawable);
	XFreeGC(drw->dpy, drw->gc);
	drw_fontset_free(drw->fonts);
	free(drw);
}

/* This function is an implementation detail. Library users should use
 * drw_fontset_create instead.
 */
static Fnt *
xfont_create(Drw *drw, const char *fontname, FcPattern *fontpattern)
{
	Fnt *font;
	XftFont *xfont = NULL;
	FcPattern *pattern = NULL;

	if (fontname) {
		/* Using the pattern found at font->xfont->pattern does not yield the
		 * same substitution results as using the pattern returned by
		 * FcNameParse; using the latter results in the desired fallback
		 * behaviour whereas the former just results in missing-character
		 * rectangles being drawn, at least with some fonts. */
		if (!(xfont = XftFontOpenName(drw->dpy, drw->screen, fontname))) {
			fprintf(stderr, "error, cannot load font from name: '%s'\n", fontname);
			return NULL;
		}
		if (!(pattern = FcNameParse((FcChar8 *) fontname))) {
			fprintf(stderr, "error, cannot parse font name to pattern: '%s'\n", fontname);
			XftFontClose(drw->dpy, xfont);
			return NULL;
		}
	} else if (fontpattern) {
		if (!(xfont = XftFontOpenPattern(drw->dpy, fontpattern))) {
			fprintf(stderr, "error, cannot load font from pattern.\n");
			return NULL;
		}
	} else {
		die("no font specified.");
	}

	font = ecalloc(1, sizeof(Fnt));
	font->xfont = xfont;
	font->pattern = pattern;
	font->h = xfont->ascent + xfont->descent;
	font->dpy = drw->dpy;

	return font;
}

static void
xfont_free(Fnt *font)
{
	if (!font)
		return;
	if (font->pattern)
		FcPatternDestroy(font->pattern);
	XftFontClose(font->dpy, font->xfont);
	free(font);
}

Fnt*
drw_fontset_create(Drw* drw, const char *fonts[], size_t fontcount)
{
	Fnt *cur, *ret = NULL;
	size_t i;

	if (!drw || !fonts)
		return NULL;

	for (i = 1; i <= fontcount; i++) {
		if ((cur = xfont_create(drw, fonts[fontcount - i], NULL))) {
			cur->next = ret;
			ret = cur;
		}
	}
	return (drw->fonts = ret);
}

void
drw_fontset_free(Fnt *font)
{
	if (font) {
		drw_fontset_free(font->next);
		xfont_free(font);
	}
}

void
drw_clr_create(Drw *drw, Clr *dest, const char *clrname)
{
	if (!drw || !dest || !clrname)
		return;

	if (!XftColorAllocName(drw->dpy, DefaultVisual(drw->dpy, drw->screen),
	                       DefaultColormap(drw->dpy, drw->screen),
	                       clrname, dest))
		die("error, cannot allocate color '%s'", clrname);
}

/* Create color schemes. */
Clr *
drw_scm_create(Drw *drw, const char *clrnames[], size_t clrcount)
{
	size_t i;
	Clr *ret;

	/* need at least two colors for a scheme */
	if (!drw || !clrnames || clrcount < 2 || !(ret = ecalloc(clrcount, sizeof(Clr))))
		return NULL;

	for (i = 0; i < clrcount; i++)
		drw_clr_create(drw, &ret[i], clrnames[i]);
	return ret;
}

void
drw_clr_free(Drw *drw, Clr *c)
{
	if (!drw || !c)
		return;

	/* c is typedef XftColor Clr */
	XftColorFree(drw->dpy, DefaultVisual(drw->dpy, drw->screen),
	             DefaultColormap(drw->dpy, drw->screen), c);
}

void
drw_scm_free(Drw *drw, Clr *scm, size_t clrcount)
{
	size_t i;

	if (!drw || !scm)
		return;

	for (i = 0; i < clrcount; i++)
		drw_clr_free(drw, &scm[i]);
	free(scm);
}

void
drw_setfontset(Drw *drw, Fnt *set)
{
	if (drw)
		drw->fonts = set;
}

void
drw_setscheme(Drw *drw, Clr *scm)
{
	if (drw)
		drw->scheme = scm;
}

void
drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int filled, int invert)
{
	if (!drw || !drw->scheme)
		return;
	XSetForeground(drw->dpy, drw->gc, invert ? drw->scheme[ColBg].pixel : drw->scheme[ColFg].pixel);
	if (filled)
		XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
	else
		XDrawRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w - 1, h - 1);
}

int
drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lpad, const char *text, int invert)
{
	int ty, ellipsis_x = 0;
	unsigned int tmpw, ew, ellipsis_w = 0, ellipsis_len, hash, h0, h1;
	XftDraw *d = NULL;
	Fnt *usedfont, *curfont, *nextfont;
	int utf8strlen, utf8charlen, utf8err, render = x || y || w || h;
	long utf8codepoint = 0;
	const char *utf8str;
	FcCharSet *fccharset;
	FcPattern *fcpattern;
	FcPattern *match;
	XftResult result;
	int charexists = 0, overflow = 0;
	/* keep track of a couple codepoints for which we have no match. */
	static unsigned int nomatches[128], ellipsis_width, invalid_width;
	static const char invalid[] = "�";

	if (!drw || (render && (!drw->scheme || !w)) || !text || !drw->fonts)
		return 0;

	if (!render) {
		w = invert ? invert : ~invert;
	} else {
		XSetForeground(drw->dpy, drw->gc, drw->scheme[invert ? ColFg : ColBg].pixel);
		XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
		if (w < lpad)
			return x + w;
		d = XftDrawCreate(drw->dpy, drw->drawable,
		                  DefaultVisual(drw->dpy, drw->screen),
		                  DefaultColormap(drw->dpy, drw->screen));
		x += lpad;
		w -= lpad;
	}

	usedfont = drw->fonts;
	if (!ellipsis_width && render)
		ellipsis_width = drw_fontset_getwidth(drw, "...");
	if (!invalid_width && render)
		invalid_width = drw_fontset_getwidth(drw, invalid);
	while (1) {
		ew = ellipsis_len = utf8err = utf8charlen = utf8strlen = 0;
		utf8str = text;
		nextfont = NULL;
		while (*text) {
			utf8charlen = utf8decode(text, &utf8codepoint, &utf8err);
			for (curfont = drw->fonts; curfont; curfont = curfont->next) {
				charexists = charexists || XftCharExists(drw->dpy, curfont->xfont, utf8codepoint);
				if (charexists) {
					drw_font_getexts(curfont, text, utf8charlen, &tmpw, NULL);
					if (ew + ellipsis_width <= w) {
						/* keep track where the ellipsis still fits */
						ellipsis_x = x + ew;
						ellipsis_w = w - ew;
						ellipsis_len = utf8strlen;
					}

					if (ew + tmpw > w) {
						overflow = 1;
						/* called from drw_fontset_getwidth_clamp():
						 * it wants the width AFTER the overflow
						 */
						if (!render)
							x += tmpw;
						else
							utf8strlen = ellipsis_len;
					} else if (curfont == usedfont) {
						text += utf8charlen;
						utf8strlen += utf8err ? 0 : utf8charlen;
						ew += utf8err ? 0 : tmpw;
					} else {
						nextfont = curfont;
					}
					break;
				}
			}

			if (overflow || !charexists || nextfont || utf8err)
				break;
			else
				charexists = 0;
		}

		if (utf8strlen) {
			if (render) {
				ty = y + (h - usedfont->h) / 2 + usedfont->xfont->ascent;
				XftDrawStringUtf8(d, &drw->scheme[invert ? ColBg : ColFg],
				                  usedfont->xfont, x, ty, (XftChar8 *)utf8str, utf8strlen);
			}
			x += ew;
			w -= ew;
		}
		if (utf8err && (!render || invalid_width < w)) {
			if (render)
				drw_text(drw, x, y, w, h, 0, invalid, invert);
			x += invalid_width;
			w -= invalid_width;
		}
		if (render && overflow)
			drw_text(drw, ellipsis_x, y, ellipsis_w, h, 0, "...", invert);

		if (!*text || overflow) {
			break;
		} else if (nextfont) {
			charexists = 0;
			usedfont = nextfont;
		} else {
			/* Regardless of whether or not a fallback font is found, the
			 * character must be drawn. */
			charexists = 1;

			hash = (unsigned int)utf8codepoint;
			hash = ((hash >> 16) ^ hash) * 0x21F0AAAD;
			hash = ((hash >> 15) ^ hash) * 0xD35A2D97;
			h0 = ((hash >> 15) ^ hash) % LENGTH(nomatches);
			h1 = (hash >> 17) % LENGTH(nomatches);
			/* avoid expensive XftFontMatch call when we know we won't find a match */
			if (nomatches[h0] == utf8codepoint || nomatches[h1] == utf8codepoint)
				goto no_match;

			fccharset = FcCharSetCreate();
			FcCharSetAddChar(fccharset, utf8codepoint);

			if (!drw->fonts->pattern) {
				/* Refer to the comment in xfont_create for more information. */
				die("the first font in the cache must be loaded from a font string.");
			}

			fcpattern = FcPatternDuplicate(drw->fonts->pattern);
			FcPatternAddCharSet(fcpattern, FC_CHARSET, fccharset);
			FcPatternAddBool(fcpattern, FC_SCALABLE, FcTrue);

			FcConfigSubstitute(NULL, fcpattern, FcMatchPattern);
			FcDefaultSubstitute(fcpattern);
			match = XftFontMatch(drw->dpy, drw->screen, fcpattern, &result);

			FcCharSetDestroy(fccharset);
			FcPatternDestroy(fcpattern);

			if (match) {
				usedfont = xfont_create(drw, NULL, match);
				if (usedfont && XftCharExists(drw->dpy, usedfont->xfont, utf8codepoint)) {
					for (curfont = drw->fonts; curfont->next; curfont = curfont->next)
						; /* NOP */
					curfont->next = usedfont;
				} else {
					xfont_free(usedfont);
					nomatches[nomatches[h0] ? h1 : h0] = utf8codepoint;
no_match:
					usedfont = drw->fonts;
				}
			}
		}
	}
	if (d)
		XftDrawDestroy(d);

	return x + (render ? w : 0);
}

void
drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int h)
{
	if (!drw)
		return;

	XCopyArea(drw->dpy, drw->drawable, win, drw->gc, x, y, w, h, x, y);
	XSync(drw->dpy, False);
}

unsigned int
drw_fontset_getwidth(Drw *drw, const char *text)
{
	if (!drw || !drw->fonts || !text)
		return 0;
	return drw_text(drw, 0, 0, 0, 0, 0, text, 0);
}

unsigned int
drw_fontset_getwidth_clamp(Drw *drw, const char *text, unsigned int n)
{
	unsigned int tmp = 0;
	if (drw && drw->fonts && text && n)
		tmp = drw_text(drw, 0, 0, 0, 0, 0, text, n);
	return MIN(n, tmp);
}

void
drw_font_getexts(Fnt *font, const char *text, unsigned int len, unsigned int *w, unsigned int *h)
{
	XGlyphInfo ext;

	if (!font || !text)
		return;

	XftTextExtentsUtf8(font->dpy, font->xfont, (XftChar8 *)text, len, &ext);
	if (w)
		*w = ext.xOff;
	if (h)
		*h = font->h;
}

Cur *
drw_cur_create(Drw *drw, int shape)
{
	Cur *cur;

	if (!drw || !(cur = ecalloc(1, sizeof(Cur))))
		return NULL;

	cur->cursor = XCreateFontCursor(drw->dpy, shape);

	return cur;
}

void
drw_cur_free(Drw *drw, Cur *cursor)
{
	if (!cursor)
		return;

	XFreeCursor(drw->dpy, cursor->cursor);
	free(cursor);
}

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
13	static int
14	utf8decode(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
49	Drw *
50	drw_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
66	void
67	drw_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
79	void
80	drw_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	*/
91	static Fnt *
92	xfont_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
131	static void
132	xfont_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
142	Fnt*
143	drw_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
160	void
161	drw_fontset_free(Fnt *font)
162	{
163	if (font) {
164	drw_fontset_free(font->next);
165	xfont_free(font);
166	}
167	}
168
169	void
170	drw_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	/* Create color schemes. */
182	Clr *
183	drw_scm_create(Drw drw, const char clrnames[], size_t clrcount)
184	{
185	size_t i;
186	Clr *ret;
187
188	/* need at least two colors for a scheme */
189	if (!drw \|\| !clrnames \|\| clrcount < 2 \|\| !(ret = ecalloc(clrcount, sizeof(Clr))))
190	return NULL;
191
192	for (i = 0; i < clrcount; i++)
193	drw_clr_create(drw, &ret[i], clrnames[i]);
194	return ret;
195	}
196
197	void
198	drw_clr_free(Drw drw, Clr c)
199	{
200	if (!drw \|\| !c)
201	return;
202
203	/* c is typedef XftColor Clr */
204	XftColorFree(drw->dpy, DefaultVisual(drw->dpy, drw->screen),
205	DefaultColormap(drw->dpy, drw->screen), c);
206	}
207
208	void
209	drw_scm_free(Drw drw, Clr scm, size_t clrcount)
210	{
211	size_t i;
212
213	if (!drw \|\| !scm)
214	return;
215
216	for (i = 0; i < clrcount; i++)
217	drw_clr_free(drw, &scm[i]);
218	free(scm);
219	}
220
221	void
222	drw_setfontset(Drw drw, Fnt set)
223	{
224	if (drw)
225	drw->fonts = set;
226	}
227
228	void
229	drw_setscheme(Drw drw, Clr scm)
230	{
231	if (drw)
232	drw->scheme = scm;
233	}
234
235	void
236	drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int filled, int invert)
237	{
238	if (!drw \|\| !drw->scheme)
239	return;
240	XSetForeground(drw->dpy, drw->gc, invert ? drw->scheme[ColBg].pixel : drw->scheme[ColFg].pixel);
241	if (filled)
242	XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
243	else
244	XDrawRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w - 1, h - 1);
245	}
246
247	int
248	drw_text(Drw drw, int x, int y, unsigned int w, unsigned int h, unsigned int lpad, const char text, int invert)
249	{
250	int ty, ellipsis_x = 0;
251	unsigned int tmpw, ew, ellipsis_w = 0, ellipsis_len, hash, h0, h1;
252	XftDraw *d = NULL;
253	Fnt usedfont, curfont, *nextfont;
254	int utf8strlen, utf8charlen, utf8err, render = x \|\| y \|\| w \|\| h;
255	long utf8codepoint = 0;
256	const char *utf8str;
257	FcCharSet *fccharset;
258	FcPattern *fcpattern;
259	FcPattern *match;
260	XftResult result;
261	int charexists = 0, overflow = 0;
262	/* keep track of a couple codepoints for which we have no match. */
263	static unsigned int nomatches[128], ellipsis_width, invalid_width;
264	static const char invalid[] = "�";
265
266	if (!drw \|\| (render && (!drw->scheme \|\| !w)) \|\| !text \|\| !drw->fonts)
267	return 0;
268
269	if (!render) {
270	w = invert ? invert : ~invert;
271	} else {
272	XSetForeground(drw->dpy, drw->gc, drw->scheme[invert ? ColFg : ColBg].pixel);
273	XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
274	if (w < lpad)
275	return x + w;
276	d = XftDrawCreate(drw->dpy, drw->drawable,
277	DefaultVisual(drw->dpy, drw->screen),
278	DefaultColormap(drw->dpy, drw->screen));
279	x += lpad;
280	w -= lpad;
281	}
282
283	usedfont = drw->fonts;
284	if (!ellipsis_width && render)
285	ellipsis_width = drw_fontset_getwidth(drw, "...");
286	if (!invalid_width && render)
287	invalid_width = drw_fontset_getwidth(drw, invalid);
288	while (1) {
289	ew = ellipsis_len = utf8err = utf8charlen = utf8strlen = 0;
290	utf8str = text;
291	nextfont = NULL;
292	while (*text) {
293	utf8charlen = utf8decode(text, &utf8codepoint, &utf8err);
294	for (curfont = drw->fonts; curfont; curfont = curfont->next) {
295	charexists = charexists \|\| XftCharExists(drw->dpy, curfont->xfont, utf8codepoint);
296	if (charexists) {
297	drw_font_getexts(curfont, text, utf8charlen, &tmpw, NULL);
298	if (ew + ellipsis_width <= w) {
299	/* keep track where the ellipsis still fits */
300	ellipsis_x = x + ew;
301	ellipsis_w = w - ew;
302	ellipsis_len = utf8strlen;
303	}
304
305	if (ew + tmpw > w) {
306	overflow = 1;
307	/* called from drw_fontset_getwidth_clamp():
308	* it wants the width AFTER the overflow
309	*/
310	if (!render)
311	x += tmpw;
312	else
313	utf8strlen = ellipsis_len;
314	} else if (curfont == usedfont) {
315	text += utf8charlen;
316	utf8strlen += utf8err ? 0 : utf8charlen;
317	ew += utf8err ? 0 : tmpw;
318	} else {
319	nextfont = curfont;
320	}
321	break;
322	}
323	}
324
325	if (overflow \|\| !charexists \|\| nextfont \|\| utf8err)
326	break;
327	else
328	charexists = 0;
329	}
330
331	if (utf8strlen) {
332	if (render) {
333	ty = y + (h - usedfont->h) / 2 + usedfont->xfont->ascent;
334	XftDrawStringUtf8(d, &drw->scheme[invert ? ColBg : ColFg],
335	usedfont->xfont, x, ty, (XftChar8 *)utf8str, utf8strlen);
336	}
337	x += ew;
338	w -= ew;
339	}
340	if (utf8err && (!render \|\| invalid_width < w)) {
341	if (render)
342	drw_text(drw, x, y, w, h, 0, invalid, invert);
343	x += invalid_width;
344	w -= invalid_width;
345	}
346	if (render && overflow)
347	drw_text(drw, ellipsis_x, y, ellipsis_w, h, 0, "...", invert);
348
349	if (!*text \|\| overflow) {
350	break;
351	} else if (nextfont) {
352	charexists = 0;
353	usedfont = nextfont;
354	} else {
355	/* Regardless of whether or not a fallback font is found, the
356	* character must be drawn. */
357	charexists = 1;
358
359	hash = (unsigned int)utf8codepoint;
360	hash = ((hash >> 16) ^ hash) * 0x21F0AAAD;
361	hash = ((hash >> 15) ^ hash) * 0xD35A2D97;
362	h0 = ((hash >> 15) ^ hash) % LENGTH(nomatches);
363	h1 = (hash >> 17) % LENGTH(nomatches);
364	/* avoid expensive XftFontMatch call when we know we won't find a match */
365	if (nomatches[h0] == utf8codepoint \|\| nomatches[h1] == utf8codepoint)
366	goto no_match;
367
368	fccharset = FcCharSetCreate();
369	FcCharSetAddChar(fccharset, utf8codepoint);
370
371	if (!drw->fonts->pattern) {
372	/* Refer to the comment in xfont_create for more information. */
373	die("the first font in the cache must be loaded from a font string.");
374	}
375
376	fcpattern = FcPatternDuplicate(drw->fonts->pattern);
377	FcPatternAddCharSet(fcpattern, FC_CHARSET, fccharset);
378	FcPatternAddBool(fcpattern, FC_SCALABLE, FcTrue);
379
380	FcConfigSubstitute(NULL, fcpattern, FcMatchPattern);
381	FcDefaultSubstitute(fcpattern);
382	match = XftFontMatch(drw->dpy, drw->screen, fcpattern, &result);
383
384	FcCharSetDestroy(fccharset);
385	FcPatternDestroy(fcpattern);
386
387	if (match) {
388	usedfont = xfont_create(drw, NULL, match);
389	if (usedfont && XftCharExists(drw->dpy, usedfont->xfont, utf8codepoint)) {
390	for (curfont = drw->fonts; curfont->next; curfont = curfont->next)
391	; /* NOP */
392	curfont->next = usedfont;
393	} else {
394	xfont_free(usedfont);
395	nomatches[nomatches[h0] ? h1 : h0] = utf8codepoint;
396	no_match:
397	usedfont = drw->fonts;
398	}
399	}
400	}
401	}
402	if (d)
403	XftDrawDestroy(d);
404
405	return x + (render ? w : 0);
406	}
407
408	void
409	drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int h)
410	{
411	if (!drw)
412	return;
413
414	XCopyArea(drw->dpy, drw->drawable, win, drw->gc, x, y, w, h, x, y);
415	XSync(drw->dpy, False);
416	}
417
418	unsigned int
419	drw_fontset_getwidth(Drw drw, const char text)
420	{
421	if (!drw \|\| !drw->fonts \|\| !text)
422	return 0;
423	return drw_text(drw, 0, 0, 0, 0, 0, text, 0);
424	}
425
426	unsigned int
427	drw_fontset_getwidth_clamp(Drw drw, const char text, unsigned int n)
428	{
429	unsigned int tmp = 0;
430	if (drw && drw->fonts && text && n)
431	tmp = drw_text(drw, 0, 0, 0, 0, 0, text, n);
432	return MIN(n, tmp);
433	}
434
435	void
436	drw_font_getexts(Fnt font, const char text, unsigned int len, unsigned int w, unsigned int h)
437	{
438	XGlyphInfo ext;
439
440	if (!font \|\| !text)
441	return;
442
443	XftTextExtentsUtf8(font->dpy, font->xfont, (XftChar8 *)text, len, &ext);
444	if (w)
445	*w = ext.xOff;
446	if (h)
447	*h = font->h;
448	}
449
450	Cur *
451	drw_cur_create(Drw *drw, int shape)
452	{
453	Cur *cur;
454
455	if (!drw \|\| !(cur = ecalloc(1, sizeof(Cur))))
456	return NULL;
457
458	cur->cursor = XCreateFontCursor(drw->dpy, shape);
459
460	return cur;
461	}
462
463	void
464	drw_cur_free(Drw drw, Cur cursor)
465	{
466	if (!cursor)
467	return;
468
469	XFreeCursor(drw->dpy, cursor->cursor);
470	free(cursor);
471	}