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drw.c (10495B)

      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, Visual *visual, unsigned int depth, Colormap cmap)
     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->visual = visual;
     74 	drw->depth = depth;
     75 	drw->cmap = cmap;
     76 	drw->drawable = XCreatePixmap(dpy, root, w, h, depth);
     77 	drw->gc = XCreateGC(dpy, drw->drawable, 0, NULL);
     78 	XSetLineAttributes(dpy, drw->gc, 1, LineSolid, CapButt, JoinMiter);
     79 
     80 	return drw;
     81 }
     82 
     83 void
     84 drw_resize(Drw *drw, unsigned int w, unsigned int h)
     85 {
     86 	if (!drw)
     87 		return;
     88 
     89 	drw->w = w;
     90 	drw->h = h;
     91 	if (drw->drawable)
     92 		XFreePixmap(drw->dpy, drw->drawable);
     93 	drw->drawable = XCreatePixmap(drw->dpy, drw->root, w, h, drw->depth);
     94 }
     95 
     96 void
     97 drw_free(Drw *drw)
     98 {
     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_fontset_create instead.
    106  */
    107 static Fnt *
    108 xfont_create(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 the
    116 		 * 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 missing-character
    119 		 * rectangles being drawn, at least with some fonts. */
    120 		if (!(xfont = XftFontOpenName(drw->dpy, drw->screen, fontname))) {
    121 			fprintf(stderr, "error, cannot load font from name: '%s'\n", fontname);
    122 			return NULL;
    123 		}
    124 		if (!(pattern = FcNameParse((FcChar8 *) fontname))) {
    125 			fprintf(stderr, "error, cannot parse font name to pattern: '%s'\n", fontname);
    126 			XftFontClose(drw->dpy, xfont);
    127 			return NULL;
    128 		}
    129 	} else if (fontpattern) {
    130 		if (!(xfont = XftFontOpenPattern(drw->dpy, fontpattern))) {
    131 			fprintf(stderr, "error, cannot load font from pattern.\n");
    132 			return NULL;
    133 		}
    134 	} else {
    135 		die("no font specified.");
    136 	}
    137 
    138 	/* Do not allow using color fonts. This is a workaround for a BadLength
    139 	 * error from Xft with color glyphs. Modelled on the Xterm workaround. See
    140 	 * https://bugzilla.redhat.com/show_bug.cgi?id=1498269
    141 	 * https://lists.suckless.org/dev/1701/30932.html
    142 	 * https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=916349
    143 	 * and lots more all over the internet.
    144 	 */
    145 	FcBool iscol;
    146 	if(FcPatternGetBool(xfont->pattern, FC_COLOR, 0, &iscol) == FcResultMatch && iscol) {
    147 		XftFontClose(drw->dpy, xfont);
    148 		return NULL;
    149 	}
    150 
    151 	font = ecalloc(1, sizeof(Fnt));
    152 	font->xfont = xfont;
    153 	font->pattern = pattern;
    154 	font->h = xfont->ascent + xfont->descent;
    155 	font->dpy = drw->dpy;
    156 
    157 	return font;
    158 }
    159 
    160 static void
    161 xfont_free(Fnt *font)
    162 {
    163 	if (!font)
    164 		return;
    165 	if (font->pattern)
    166 		FcPatternDestroy(font->pattern);
    167 	XftFontClose(font->dpy, font->xfont);
    168 	free(font);
    169 }
    170 
    171 Fnt*
    172 drw_fontset_create(Drw* drw, const char *fonts[], size_t fontcount)
    173 {
    174 	Fnt *cur, *ret = NULL;
    175 	size_t i;
    176 
    177 	if (!drw || !fonts)
    178 		return NULL;
    179 
    180 	for (i = 1; i <= fontcount; i++) {
    181 		if ((cur = xfont_create(drw, fonts[fontcount - i], NULL))) {
    182 			cur->next = ret;
    183 			ret = cur;
    184 		}
    185 	}
    186 	return (drw->fonts = ret);
    187 }
    188 
    189 void
    190 drw_fontset_free(Fnt *font)
    191 {
    192 	if (font) {
    193 		drw_fontset_free(font->next);
    194 		xfont_free(font);
    195 	}
    196 }
    197 
    198 void
    199 drw_clr_create(Drw *drw, Clr *dest, const char *clrname, const unsigned int alpha)
    200 {
    201 	if (!drw || !dest || !clrname)
    202 		return;
    203 
    204 	if (!XftColorAllocName(drw->dpy, drw->visual, drw->cmap,
    205 	                       clrname, dest))
    206 		die("error, cannot allocate color '%s'", clrname);
    207 
    208     dest->pixel = (dest->pixel & 0x00ffffffU) | (alpha << 24);
    209 
    210 }
    211 
    212 /* Wrapper to create color schemes. The caller has to call free(3) on the
    213  * returned color scheme when done using it. */
    214 Clr *
    215 drw_scm_create(Drw *drw, char *clrnames[], const unsigned int alphas[], size_t clrcount)
    216 {
    217 	size_t i;
    218 	Clr *ret;
    219 
    220 	/* need at least two colors for a scheme */
    221 	if (!drw || !clrnames || clrcount < 2 || !(ret = ecalloc(clrcount, sizeof(XftColor))))
    222 		return NULL;
    223 
    224 	for (i = 0; i < clrcount; i++)
    225 		drw_clr_create(drw, &ret[i], clrnames[i], alphas[i]);
    226 	return ret;
    227 }
    228 
    229 void
    230 drw_setfontset(Drw *drw, Fnt *set)
    231 {
    232 	if (drw)
    233 		drw->fonts = set;
    234 }
    235 
    236 void
    237 drw_setscheme(Drw *drw, Clr *scm)
    238 {
    239 	if (drw)
    240 		drw->scheme = scm;
    241 }
    242 
    243 void
    244 drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int filled, int invert)
    245 {
    246 	if (!drw || !drw->scheme)
    247 		return;
    248 	XSetForeground(drw->dpy, drw->gc, invert ? drw->scheme[ColBg].pixel : drw->scheme[ColFg].pixel);
    249 	if (filled)
    250 		XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
    251 	else
    252 		XDrawRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w - 1, h - 1);
    253 }
    254 
    255 int
    256 drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lpad, const char *text, int invert)
    257 {
    258 	char buf[1024];
    259 	int ty;
    260 	unsigned int ew;
    261 	XftDraw *d = NULL;
    262 	Fnt *usedfont, *curfont, *nextfont;
    263 	size_t i, len;
    264 	int utf8strlen, utf8charlen, render = x || y || w || h;
    265 	long utf8codepoint = 0;
    266 	const char *utf8str;
    267 	FcCharSet *fccharset;
    268 	FcPattern *fcpattern;
    269 	FcPattern *match;
    270 	XftResult result;
    271 	int charexists = 0;
    272 
    273 	if (!drw || (render && !drw->scheme) || !text || !drw->fonts)
    274 		return 0;
    275 
    276 	if (!render) {
    277 		w = ~w;
    278 	} else {
    279 		XSetForeground(drw->dpy, drw->gc, drw->scheme[invert ? ColFg : ColBg].pixel);
    280 		XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
    281 		d = XftDrawCreate(drw->dpy, drw->drawable, drw->visual, drw->cmap);
    282 		x += lpad;
    283 		w -= lpad;
    284 	}
    285 
    286 	usedfont = drw->fonts;
    287 	while (1) {
    288 		utf8strlen = 0;
    289 		utf8str = text;
    290 		nextfont = NULL;
    291 		while (*text) {
    292 			utf8charlen = utf8decode(text, &utf8codepoint, UTF_SIZ);
    293 			for (curfont = drw->fonts; curfont; curfont = curfont->next) {
    294 				charexists = charexists || XftCharExists(drw->dpy, curfont->xfont, utf8codepoint);
    295 				if (charexists) {
    296 					if (curfont == usedfont) {
    297 						utf8strlen += utf8charlen;
    298 						text += utf8charlen;
    299 					} else {
    300 						nextfont = curfont;
    301 					}
    302 					break;
    303 				}
    304 			}
    305 
    306 			if (!charexists || nextfont)
    307 				break;
    308 			else
    309 				charexists = 0;
    310 		}
    311 
    312 		if (utf8strlen) {
    313 			drw_font_getexts(usedfont, utf8str, utf8strlen, &ew, NULL);
    314 			/* shorten text if necessary */
    315 			for (len = MIN(utf8strlen, sizeof(buf) - 1); len && ew > w; len--)
    316 				drw_font_getexts(usedfont, utf8str, len, &ew, NULL);
    317 
    318 			if (len) {
    319 				memcpy(buf, utf8str, len);
    320 				buf[len] = '\0';
    321 				if (len < utf8strlen)
    322 					for (i = len; i && i > len - 3; buf[--i] = '.')
    323 						; /* NOP */
    324 
    325 				if (render) {
    326 					ty = y + (h - usedfont->h) / 2 + usedfont->xfont->ascent;
    327 					XftDrawStringUtf8(d, &drw->scheme[invert ? ColBg : ColFg],
    328 					                  usedfont->xfont, x, ty, (XftChar8 *)buf, len);
    329 				}
    330 				x += ew;
    331 				w -= ew;
    332 			}
    333 		}
    334 
    335 		if (!*text) {
    336 			break;
    337 		} else if (nextfont) {
    338 			charexists = 0;
    339 			usedfont = nextfont;
    340 		} else {
    341 			/* Regardless of whether or not a fallback font is found, the
    342 			 * character must be drawn. */
    343 			charexists = 1;
    344 
    345 			fccharset = FcCharSetCreate();
    346 			FcCharSetAddChar(fccharset, utf8codepoint);
    347 
    348 			if (!drw->fonts->pattern) {
    349 				/* Refer to the comment in xfont_create for more information. */
    350 				die("the first font in the cache must be loaded from a font string.");
    351 			}
    352 
    353 			fcpattern = FcPatternDuplicate(drw->fonts->pattern);
    354 			FcPatternAddCharSet(fcpattern, FC_CHARSET, fccharset);
    355 			FcPatternAddBool(fcpattern, FC_SCALABLE, FcTrue);
    356 			FcPatternAddBool(fcpattern, FC_COLOR, FcFalse);
    357 
    358 			FcConfigSubstitute(NULL, fcpattern, FcMatchPattern);
    359 			FcDefaultSubstitute(fcpattern);
    360 			match = XftFontMatch(drw->dpy, drw->screen, fcpattern, &result);
    361 
    362 			FcCharSetDestroy(fccharset);
    363 			FcPatternDestroy(fcpattern);
    364 
    365 			if (match) {
    366 				usedfont = xfont_create(drw, NULL, match);
    367 				if (usedfont && XftCharExists(drw->dpy, usedfont->xfont, utf8codepoint)) {
    368 					for (curfont = drw->fonts; curfont->next; curfont = curfont->next)
    369 						; /* NOP */
    370 					curfont->next = usedfont;
    371 				} else {
    372 					xfont_free(usedfont);
    373 					usedfont = drw->fonts;
    374 				}
    375 			}
    376 		}
    377 	}
    378 	if (d)
    379 		XftDrawDestroy(d);
    380 
    381 	return x + (render ? w : 0);
    382 }
    383 
    384 void
    385 drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int h)
    386 {
    387 	if (!drw)
    388 		return;
    389 
    390 	XCopyArea(drw->dpy, drw->drawable, win, drw->gc, x, y, w, h, x, y);
    391 	XSync(drw->dpy, False);
    392 }
    393 
    394 unsigned int
    395 drw_fontset_getwidth(Drw *drw, const char *text)
    396 {
    397 	if (!drw || !drw->fonts || !text)
    398 		return 0;
    399 	return drw_text(drw, 0, 0, 0, 0, 0, text, 0);
    400 }
    401 
    402 void
    403 drw_font_getexts(Fnt *font, const char *text, unsigned int len, unsigned int *w, unsigned int *h)
    404 {
    405 	XGlyphInfo ext;
    406 
    407 	if (!font || !text)
    408 		return;
    409 
    410 	XftTextExtentsUtf8(font->dpy, font->xfont, (XftChar8 *)text, len, &ext);
    411 	if (w)
    412 		*w = ext.xOff;
    413 	if (h)
    414 		*h = font->h;
    415 }
    416 
    417 Cur *
    418 drw_cur_create(Drw *drw, int shape)
    419 {
    420 	Cur *cur;
    421 
    422 	if (!drw || !(cur = ecalloc(1, sizeof(Cur))))
    423 		return NULL;
    424 
    425 	cur->cursor = XCreateFontCursor(drw->dpy, shape);
    426 
    427 	return cur;
    428 }
    429 
    430 void
    431 drw_cur_free(Drw *drw, Cur *cursor)
    432 {
    433 	if (!cursor)
    434 		return;
    435 
    436 	XFreeCursor(drw->dpy, cursor->cursor);
    437 	free(cursor);
    438 }