dmenu

Dmenu fork with xft fonts.
git clone git://r-36.net/dmenu
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drw.c (9507B)

      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;
     67 
     68 	drw = ecalloc(1, sizeof(Drw));
     69 	drw->dpy = dpy;
     70 	drw->screen = screen;
     71 	drw->root = root;
     72 	drw->w = w;
     73 	drw->h = h;
     74 	drw->drawable = XCreatePixmap(dpy, root, w, h, DefaultDepth(dpy, screen));
     75 	drw->gc = XCreateGC(dpy, root, 0, NULL);
     76 	drw->fontcount = 0;
     77 	XSetLineAttributes(dpy, drw->gc, 1, LineSolid, CapButt, JoinMiter);
     78 
     79 	return drw;
     80 }
     81 
     82 void
     83 drw_resize(Drw *drw, unsigned int w, unsigned int h)
     84 {
     85 	drw->w = w;
     86 	drw->h = h;
     87 	if (drw->drawable)
     88 		XFreePixmap(drw->dpy, drw->drawable);
     89 	drw->drawable = XCreatePixmap(drw->dpy, drw->root, w, h, DefaultDepth(drw->dpy, drw->screen));
     90 }
     91 
     92 void
     93 drw_free(Drw *drw)
     94 {
     95 	size_t i;
     96 
     97 	for (i = 0; i < drw->fontcount; i++)
     98 		drw_font_free(drw->fonts[i]);
     99 	XFreePixmap(drw->dpy, drw->drawable);
    100 	XFreeGC(drw->dpy, drw->gc);
    101 	free(drw);
    102 }
    103 
    104 /* This function is an implementation detail. Library users should use
    105  * drw_font_create instead.
    106  */
    107 static Fnt *
    108 drw_font_xcreate(Drw *drw, const char *fontname, FcPattern *fontpattern)
    109 {
    110 	Fnt *font;
    111 	XftFont *xfont = NULL;
    112 	FcPattern *pattern = NULL;
    113 
    114 	if (fontname) {
    115 		/* Using the pattern found at font->xfont->pattern does not yield same
    116 		 * the same substitution results as using the pattern returned by
    117 		 * FcNameParse; using the latter results in the desired fallback
    118 		 * behaviour whereas the former just results in
    119 		 * missing-character-rectangles being drawn, at least with some fonts.
    120 		 */
    121 		if (!(xfont = XftFontOpenName(drw->dpy, drw->screen, fontname))) {
    122 			fprintf(stderr, "error, cannot load font: '%s'\n", fontname);
    123 			return NULL;
    124 		}
    125 		if (!(pattern = FcNameParse((FcChar8 *) fontname))) {
    126 			fprintf(stderr, "error, cannot load font: '%s'\n", fontname);
    127 			XftFontClose(drw->dpy, xfont);
    128 			return NULL;
    129 		}
    130 	} else if (fontpattern) {
    131 		if (!(xfont = XftFontOpenPattern(drw->dpy, fontpattern))) {
    132 			fprintf(stderr, "error, cannot load font pattern.\n");
    133 			return NULL;
    134 		}
    135 	} else {
    136 		die("no font specified.\n");
    137 	}
    138 
    139 	font = ecalloc(1, sizeof(Fnt));
    140 	font->xfont = xfont;
    141 	font->pattern = pattern;
    142 	font->ascent = xfont->ascent;
    143 	font->descent = xfont->descent;
    144 	font->h = font->ascent + font->descent;
    145 	font->dpy = drw->dpy;
    146 
    147 	return font;
    148 }
    149 
    150 Fnt*
    151 drw_font_create(Drw *drw, const char *fontname)
    152 {
    153 	return drw_font_xcreate(drw, fontname, NULL);
    154 }
    155 
    156 void
    157 drw_load_fonts(Drw* drw, const char *fonts[], size_t fontcount)
    158 {
    159 	size_t i;
    160 	Fnt *font;
    161 
    162 	for (i = 0; i < fontcount; i++) {
    163 		if (drw->fontcount >= DRW_FONT_CACHE_SIZE) {
    164 			die("Font cache exhausted.\n");
    165 		} else if ((font = drw_font_xcreate(drw, fonts[i], NULL))) {
    166 			drw->fonts[drw->fontcount++] = font;
    167 		}
    168 	}
    169 }
    170 
    171 void
    172 drw_font_free(Fnt *font)
    173 {
    174 	if (!font)
    175 		return;
    176 	if (font->pattern)
    177 		FcPatternDestroy(font->pattern);
    178 	XftFontClose(font->dpy, font->xfont);
    179 	free(font);
    180 }
    181 
    182 Clr *
    183 drw_clr_create(Drw *drw, const char *clrname)
    184 {
    185 	Clr *clr;
    186 
    187 	clr = ecalloc(1, sizeof(Clr));
    188 	if (!XftColorAllocName(drw->dpy, DefaultVisual(drw->dpy, drw->screen),
    189 	                       DefaultColormap(drw->dpy, drw->screen),
    190 	                       clrname, &clr->rgb))
    191 		die("error, cannot allocate color '%s'\n", clrname);
    192 	clr->pix = clr->rgb.pixel;
    193 
    194 	return clr;
    195 }
    196 
    197 void
    198 drw_clr_free(Clr *clr)
    199 {
    200 	free(clr);
    201 }
    202 
    203 void
    204 drw_setscheme(Drw *drw, ClrScheme *scheme)
    205 {
    206 	drw->scheme = scheme;
    207 }
    208 
    209 void
    210 drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int filled, int empty, int invert)
    211 {
    212 	if (!drw->scheme)
    213 		return;
    214 	XSetForeground(drw->dpy, drw->gc, invert ? drw->scheme->bg->pix : drw->scheme->fg->pix);
    215 	if (filled)
    216 		XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w + 1, h + 1);
    217 	else if (empty)
    218 		XDrawRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
    219 }
    220 
    221 int
    222 drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, const char *text, int invert)
    223 {
    224 	char buf[1024];
    225 	int tx, ty, th;
    226 	Extnts tex;
    227 	XftDraw *d = NULL;
    228 	Fnt *curfont, *nextfont;
    229 	size_t i, len;
    230 	int utf8strlen, utf8charlen, render;
    231 	long utf8codepoint = 0;
    232 	const char *utf8str;
    233 	FcCharSet *fccharset;
    234 	FcPattern *fcpattern;
    235 	FcPattern *match;
    236 	XftResult result;
    237 	int charexists = 0;
    238 
    239 	if (!drw->scheme || !drw->fontcount)
    240 		return 0;
    241 
    242 	if (!(render = x || y || w || h)) {
    243 		w = ~w;
    244 	} else {
    245 		XSetForeground(drw->dpy, drw->gc, invert ?
    246 		               drw->scheme->fg->pix : drw->scheme->bg->pix);
    247 		XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
    248 		d = XftDrawCreate(drw->dpy, drw->drawable,
    249 		                  DefaultVisual(drw->dpy, drw->screen),
    250 		                  DefaultColormap(drw->dpy, drw->screen));
    251 	}
    252 
    253 	curfont = drw->fonts[0];
    254 	while (1) {
    255 		utf8strlen = 0;
    256 		utf8str = text;
    257 		nextfont = NULL;
    258 		while (*text) {
    259 			utf8charlen = utf8decode(text, &utf8codepoint, UTF_SIZ);
    260 			for (i = 0; i < drw->fontcount; i++) {
    261 				charexists = charexists || XftCharExists(drw->dpy, drw->fonts[i]->xfont, utf8codepoint);
    262 				if (charexists) {
    263 					if (drw->fonts[i] == curfont) {
    264 						utf8strlen += utf8charlen;
    265 						text += utf8charlen;
    266 					} else {
    267 						nextfont = drw->fonts[i];
    268 					}
    269 					break;
    270 				}
    271 			}
    272 
    273 			if (!charexists || (nextfont && nextfont != curfont))
    274 				break;
    275 			else
    276 				charexists = 0;
    277 		}
    278 
    279 		if (utf8strlen) {
    280 			drw_font_getexts(curfont, utf8str, utf8strlen, &tex);
    281 			/* shorten text if necessary */
    282 			for (len = MIN(utf8strlen, (sizeof buf) - 1); len && (tex.w > w - drw->fonts[0]->h || w < drw->fonts[0]->h); len--)
    283 				drw_font_getexts(curfont, utf8str, len, &tex);
    284 
    285 			if (len) {
    286 				memcpy(buf, utf8str, len);
    287 				buf[len] = '\0';
    288 				if (len < utf8strlen)
    289 					for (i = len; i && i > len - 3; buf[--i] = '.');
    290 
    291 				if (render) {
    292 					th = curfont->ascent + curfont->descent;
    293 					ty = y + (h / 2) - (th / 2) + curfont->ascent;
    294 					tx = x + (h / 2);
    295 					XftDrawStringUtf8(d, invert ? &drw->scheme->bg->rgb : &drw->scheme->fg->rgb, curfont->xfont, tx, ty, (XftChar8 *)buf, len);
    296 				}
    297 				x += tex.w;
    298 				w -= tex.w;
    299 			}
    300 		}
    301 
    302 		if (!*text) {
    303 			break;
    304 		} else if (nextfont) {
    305 			charexists = 0;
    306 			curfont = nextfont;
    307 		} else {
    308 			/* Regardless of whether or not a fallback font is found, the
    309 			 * character must be drawn.
    310 			 */
    311 			charexists = 1;
    312 
    313 			if (drw->fontcount >= DRW_FONT_CACHE_SIZE)
    314 				continue;
    315 
    316 			fccharset = FcCharSetCreate();
    317 			FcCharSetAddChar(fccharset, utf8codepoint);
    318 
    319 			if (!drw->fonts[0]->pattern) {
    320 				/* Refer to the comment in drw_font_xcreate for more
    321 				 * information. */
    322 				die("the first font in the cache must be loaded from a font string.\n");
    323 			}
    324 
    325 			fcpattern = FcPatternDuplicate(drw->fonts[0]->pattern);
    326 			FcPatternAddCharSet(fcpattern, FC_CHARSET, fccharset);
    327 			FcPatternAddBool(fcpattern, FC_SCALABLE, FcTrue);
    328 
    329 			FcConfigSubstitute(NULL, fcpattern, FcMatchPattern);
    330 			FcDefaultSubstitute(fcpattern);
    331 			match = XftFontMatch(drw->dpy, drw->screen, fcpattern, &result);
    332 
    333 			FcCharSetDestroy(fccharset);
    334 			FcPatternDestroy(fcpattern);
    335 
    336 			if (match) {
    337 				curfont = drw_font_xcreate(drw, NULL, match);
    338 				if (curfont && XftCharExists(drw->dpy, curfont->xfont, utf8codepoint)) {
    339 					drw->fonts[drw->fontcount++] = curfont;
    340 				} else {
    341 					drw_font_free(curfont);
    342 					curfont = drw->fonts[0];
    343 				}
    344 			}
    345 		}
    346 	}
    347 	if (d)
    348 		XftDrawDestroy(d);
    349 
    350 	return x;
    351 }
    352 
    353 void
    354 drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int h)
    355 {
    356 	XCopyArea(drw->dpy, drw->drawable, win, drw->gc, x, y, w, h, x, y);
    357 	XSync(drw->dpy, False);
    358 }
    359 
    360 void
    361 drw_font_getexts(Fnt *font, const char *text, unsigned int len, Extnts *tex)
    362 {
    363 	XGlyphInfo ext;
    364 
    365 	XftTextExtentsUtf8(font->dpy, font->xfont, (XftChar8 *)text, len, &ext);
    366 	tex->h = font->h;
    367 	tex->w = ext.xOff;
    368 }
    369 
    370 unsigned int
    371 drw_font_getexts_width(Fnt *font, const char *text, unsigned int len)
    372 {
    373 	Extnts tex;
    374 
    375 	drw_font_getexts(font, text, len, &tex);
    376 
    377 	return tex.w;
    378 }
    379 
    380 Cur *
    381 drw_cur_create(Drw *drw, int shape)
    382 {
    383 	Cur *cur;
    384 
    385 	cur = ecalloc(1, sizeof(Cur));
    386 	cur->cursor = XCreateFontCursor(drw->dpy, shape);
    387 
    388 	return cur;
    389 }
    390 
    391 void
    392 drw_cur_free(Drw *drw, Cur *cursor)
    393 {
    394 	if (!cursor)
    395 		return;
    396 	XFreeCursor(drw->dpy, cursor->cursor);
    397 	free(cursor);
    398 }