dmenu

dynamic menu
git clone git://git.suckless.org/dmenu
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drw.c (11041B)


      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 }