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	drw.c - dwm - dynamic window manager
	git clone git://git.suckless.org/dwm
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	drw.c (11286B)
	---
	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,…
	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, …
	25 static const unsigned int overlong[] = { 0x0, 0x80, 0x0800, 0x10…
	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, unsign…
	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,…
	60 drw->gc = XCreateGC(dpy, root, 0, NULL);
	61 XSetLineAttributes(dpy, drw->gc, 1, LineSolid, CapButt, JoinMite…
	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, Default…
	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 …
	100 * same substitution results as using the pattern return…
	101 * FcNameParse; using the latter results in the desired …
	102 * behaviour whereas the former just results in missing-…
	103 * rectangles being drawn, at least with some fonts. */
	104 if (!(xfont = XftFontOpenName(drw->dpy, drw->screen, fon…
	105 fprintf(stderr, "error, cannot load font from na…
	106 return NULL;
	107 }
	108 if (!(pattern = FcNameParse((FcChar8 *) fontname))) {
	109 fprintf(stderr, "error, cannot parse font name t…
	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 pa…
	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->sc…
	176 DefaultColormap(drw->dpy, drw->screen),
	177 clrname, dest))
	178 die("error, cannot allocate color '%s'", clrname);
	179 }
	180
	181 /* Wrapper to create color schemes. The caller has to call free(3) on the
	182 * returned color scheme when done using it. */
	183 Clr *
	184 drw_scm_create(Drw drw, const char clrnames[], size_t clrcount)
	185 {
	186 size_t i;
	187 Clr *ret;
	188
	189 /* need at least two colors for a scheme */
	190 if (!drw \|\| !clrnames \|\| clrcount < 2 \|\| !(ret = ecalloc(clrcoun…
	191 return NULL;
	192
	193 for (i = 0; i < clrcount; i++)
	194 drw_clr_create(drw, &ret[i], clrnames[i]);
	195 return ret;
	196 }
	197
	198 void
	199 drw_setfontset(Drw drw, Fnt set)
	200 {
	201 if (drw)
	202 drw->fonts = set;
	203 }
	204
	205 void
	206 drw_setscheme(Drw drw, Clr scm)
	207 {
	208 if (drw)
	209 drw->scheme = scm;
	210 }
	211
	212 void
	213 drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int fil…
	214 {
	215 if (!drw \|\| !drw->scheme)
	216 return;
	217 XSetForeground(drw->dpy, drw->gc, invert ? drw->scheme[ColBg].pi…
	218 if (filled)
	219 XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w…
	220 else
	221 XDrawRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w…
	222 }
	223
	224 int
	225 drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigne…
	226 {
	227 int ty, ellipsis_x = 0;
	228 unsigned int tmpw, ew, ellipsis_w = 0, ellipsis_len, hash, h0, h…
	229 XftDraw *d = NULL;
	230 Fnt usedfont, curfont, *nextfont;
	231 int utf8strlen, utf8charlen, utf8err, render = x \|\| y \|\| w \|\| h;
	232 long utf8codepoint = 0;
	233 const char *utf8str;
	234 FcCharSet *fccharset;
	235 FcPattern *fcpattern;
	236 FcPattern *match;
	237 XftResult result;
	238 int charexists = 0, overflow = 0;
	239 /* keep track of a couple codepoints for which we have no match.…
	240 static unsigned int nomatches[128], ellipsis_width, invalid_widt…
	241 static const char invalid[] = "�";
	242
	243 if (!drw \|\| (render && (!drw->scheme \|\| !w)) \|\| !text \|\| !drw->f…
	244 return 0;
	245
	246 if (!render) {
	247 w = invert ? invert : ~invert;
	248 } else {
	249 XSetForeground(drw->dpy, drw->gc, drw->scheme[invert ? C…
	250 XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w…
	251 if (w < lpad)
	252 return x + w;
	253 d = XftDrawCreate(drw->dpy, drw->drawable,
	254 DefaultVisual(drw->dpy, drw->screen),
	255 DefaultColormap(drw->dpy, drw->screen)…
	256 x += lpad;
	257 w -= lpad;
	258 }
	259
	260 usedfont = drw->fonts;
	261 if (!ellipsis_width && render)
	262 ellipsis_width = drw_fontset_getwidth(drw, "...");
	263 if (!invalid_width && render)
	264 invalid_width = drw_fontset_getwidth(drw, invalid);
	265 while (1) {
	266 ew = ellipsis_len = utf8err = utf8charlen = utf8strlen =…
	267 utf8str = text;
	268 nextfont = NULL;
	269 while (*text) {
	270 utf8charlen = utf8decode(text, &utf8codepoint, &…
	271 for (curfont = drw->fonts; curfont; curfont = cu…
	272 charexists = charexists \|\| XftCharExists…
	273 if (charexists) {
	274 drw_font_getexts(curfont, text, …
	275 if (ew + ellipsis_width <= w) {
	276 /* keep track where the …
	277 ellipsis_x = x + ew;
	278 ellipsis_w = w - ew;
	279 ellipsis_len = utf8strle…
	280 }
	281
	282 if (ew + tmpw > w) {
	283 overflow = 1;
	284 /* called from drw_fonts…
	285 * it wants the width AF…
	286 */
	287 if (!render)
	288 x += tmpw;
	289 else
	290 utf8strlen = ell…
	291 } else if (curfont == usedfont) {
	292 text += utf8charlen;
	293 utf8strlen += utf8err ? …
	294 ew += utf8err ? 0 : tmpw;
	295 } else {
	296 nextfont = curfont;
	297 }
	298 break;
	299 }
	300 }
	301
	302 if (overflow \|\| !charexists \|\| nextfont \|\| utf8e…
	303 break;
	304 else
	305 charexists = 0;
	306 }
	307
	308 if (utf8strlen) {
	309 if (render) {
	310 ty = y + (h - usedfont->h) / 2 + usedfon…
	311 XftDrawStringUtf8(d, &drw->scheme[invert…
	312 usedfont->xfont, x, ty…
	313 }
	314 x += ew;
	315 w -= ew;
	316 }
	317 if (utf8err && (!render \|\| invalid_width < w)) {
	318 if (render)
	319 drw_text(drw, x, y, w, h, 0, invalid, in…
	320 x += invalid_width;
	321 w -= invalid_width;
	322 }
	323 if (render && overflow)
	324 drw_text(drw, ellipsis_x, y, ellipsis_w, h, 0, "…
	325
	326 if (!*text \|\| overflow) {
	327 break;
	328 } else if (nextfont) {
	329 charexists = 0;
	330 usedfont = nextfont;
	331 } else {
	332 /* Regardless of whether or not a fallback font …
	333 * character must be drawn. */
	334 charexists = 1;
	335
	336 hash = (unsigned int)utf8codepoint;
	337 hash = ((hash >> 16) ^ hash) * 0x21F0AAAD;
	338 hash = ((hash >> 15) ^ hash) * 0xD35A2D97;
	339 h0 = ((hash >> 15) ^ hash) % LENGTH(nomatches);
	340 h1 = (hash >> 17) % LENGTH(nomatches);
	341 /* avoid expensive XftFontMatch call when we kno…
	342 if (nomatches[h0] == utf8codepoint \|\| nomatches[…
	343 goto no_match;
	344
	345 fccharset = FcCharSetCreate();
	346 FcCharSetAddChar(fccharset, utf8codepoint);
	347
	348 if (!drw->fonts->pattern) {
	349 /* Refer to the comment in xfont_create …
	350 die("the first font in the cache must be…
	351 }
	352
	353 fcpattern = FcPatternDuplicate(drw->fonts->patte…
	354 FcPatternAddCharSet(fcpattern, FC_CHARSET, fccha…
	355 FcPatternAddBool(fcpattern, FC_SCALABLE, FcTrue);
	356
	357 FcConfigSubstitute(NULL, fcpattern, FcMatchPatte…
	358 FcDefaultSubstitute(fcpattern);
	359 match = XftFontMatch(drw->dpy, drw->screen, fcpa…
	360
	361 FcCharSetDestroy(fccharset);
	362 FcPatternDestroy(fcpattern);
	363
	364 if (match) {
	365 usedfont = xfont_create(drw, NULL, match…
	366 if (usedfont && XftCharExists(drw->dpy, …
	367 for (curfont = drw->fonts; curfo…
	368 ; /* NOP */
	369 curfont->next = usedfont;
	370 } else {
	371 xfont_free(usedfont);
	372 nomatches[nomatches[h0] ? h1 : h…
	373 no_match:
	374 usedfont = drw->fonts;
	375 }
	376 }
	377 }
	378 }
	379 if (d)
	380 XftDrawDestroy(d);
	381
	382 return x + (render ? w : 0);
	383 }
	384
	385 void
	386 drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int…
	387 {
	388 if (!drw)
	389 return;
	390
	391 XCopyArea(drw->dpy, drw->drawable, win, drw->gc, x, y, w, h, x, …
	392 XSync(drw->dpy, False);
	393 }
	394
	395 unsigned int
	396 drw_fontset_getwidth(Drw drw, const char text)
	397 {
	398 if (!drw \|\| !drw->fonts \|\| !text)
	399 return 0;
	400 return drw_text(drw, 0, 0, 0, 0, 0, text, 0);
	401 }
	402
	403 unsigned int
	404 drw_fontset_getwidth_clamp(Drw drw, const char text, unsigned int n)
	405 {
	406 unsigned int tmp = 0;
	407 if (drw && drw->fonts && text && n)
	408 tmp = drw_text(drw, 0, 0, 0, 0, 0, text, n);
	409 return MIN(n, tmp);
	410 }
	411
	412 void
	413 drw_font_getexts(Fnt font, const char text, unsigned int len, unsigned…
	414 {
	415 XGlyphInfo ext;
	416
	417 if (!font \|\| !text)
	418 return;
	419
	420 XftTextExtentsUtf8(font->dpy, font->xfont, (XftChar8 *)text, len…
	421 if (w)
	422 *w = ext.xOff;
	423 if (h)
	424 *h = font->h;
	425 }
	426
	427 Cur *
	428 drw_cur_create(Drw *drw, int shape)
	429 {
	430 Cur *cur;
	431
	432 if (!drw \|\| !(cur = ecalloc(1, sizeof(Cur))))
	433 return NULL;
	434
	435 cur->cursor = XCreateFontCursor(drw->dpy, shape);
	436
	437 return cur;
	438 }
	439
	440 void
	441 drw_cur_free(Drw drw, Cur cursor)
	442 {
	443 if (!cursor)
	444 return;
	445
	446 XFreeCursor(drw->dpy, cursor->cursor);
	447 free(cursor);
	448 }