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	drw.c - svkbd - simple virtual keyboard
	git clone git://git.suckless.org/svkbd
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	drw.c (10278B)
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	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, 0xE…
	15 static const unsigned char utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF…
	16 static const long utfmin[UTF_SIZ + 1] = { 0, 0, 0x80, 0x800, …
	17 static const long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, …
	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, 0x…
	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, unsign…
	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,…
	74 drw->gc = XCreateGC(dpy, root, 0, NULL);
	75 XSetLineAttributes(dpy, drw->gc, 1, LineSolid, CapButt, JoinMite…
	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, Default…
	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 …
	114 * same substitution results as using the pattern return…
	115 * FcNameParse; using the latter results in the desired …
	116 * behaviour whereas the former just results in missing-…
	117 * rectangles being drawn, at least with some fonts. */
	118 if (!(xfont = XftFontOpenName(drw->dpy, drw->screen, fon…
	119 fprintf(stderr, "error, cannot load font from na…
	120 return NULL;
	121 }
	122 if (!(pattern = FcNameParse((FcChar8 *) fontname))) {
	123 fprintf(stderr, "error, cannot parse font name t…
	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 pa…
	130 return NULL;
	131 }
	132 } else {
	133 die("no font specified.");
	134 }
	135
	136 /* Do not allow using color fonts. This is a workaround for a Ba…
	137 * error from Xft with color glyphs. Modelled on the Xterm worka…
	138 * https://bugzilla.redhat.com/show_bug.cgi?id=1498269
	139 * https://lists.suckless.org/dev/1701/30932.html
	140 * https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=916349
	141 * and lots more all over the internet.
	142 */
	143 FcBool iscol;
	144 if(FcPatternGetBool(xfont->pattern, FC_COLOR, 0, &iscol) == FcRe…
	145 XftFontClose(drw->dpy, xfont);
	146 return NULL;
	147 }
	148
	149 font = ecalloc(1, sizeof(Fnt));
	150 font->xfont = xfont;
	151 font->pattern = pattern;
	152 font->h = xfont->ascent + xfont->descent;
	153 font->dpy = drw->dpy;
	154
	155 return font;
	156 }
	157
	158 static void
	159 xfont_free(Fnt *font)
	160 {
	161 if (!font)
	162 return;
	163 if (font->pattern)
	164 FcPatternDestroy(font->pattern);
	165 XftFontClose(font->dpy, font->xfont);
	166 free(font);
	167 }
	168
	169 Fnt*
	170 drw_fontset_create(Drw* drw, const char *fonts[], size_t fontcount)
	171 {
	172 Fnt cur, ret = NULL;
	173 size_t i;
	174
	175 if (!drw \|\| !fonts)
	176 return NULL;
	177
	178 for (i = 1; i <= fontcount; i++) {
	179 if ((cur = xfont_create(drw, fonts[fontcount - i], NULL)…
	180 cur->next = ret;
	181 ret = cur;
	182 }
	183 }
	184 return (drw->fonts = ret);
	185 }
	186
	187 void
	188 drw_fontset_free(Fnt *font)
	189 {
	190 if (font) {
	191 drw_fontset_free(font->next);
	192 xfont_free(font);
	193 }
	194 }
	195
	196 void
	197 drw_clr_create(Drw drw, Clr dest, const char *clrname)
	198 {
	199 if (!drw \|\| !dest \|\| !clrname)
	200 return;
	201
	202 if (!XftColorAllocName(drw->dpy, DefaultVisual(drw->dpy, drw->sc…
	203 DefaultColormap(drw->dpy, drw->screen),
	204 clrname, dest))
	205 die("error, cannot allocate color '%s'", clrname);
	206 }
	207
	208 /* Wrapper to create color schemes. The caller has to call free(3) on the
	209 * returned color scheme when done using it. */
	210 Clr *
	211 drw_scm_create(Drw drw, const char clrnames[], size_t clrcount)
	212 {
	213 size_t i;
	214 Clr *ret;
	215
	216 /* need at least two colors for a scheme */
	217 if (!drw \|\| !clrnames \|\| clrcount < 2 \|\| !(ret = ecalloc(clrcoun…
	218 die("error, cannot create color scheme (drw=%d) (clrcoun…
	219
	220 for (i = 0; i < clrcount; i++)
	221 drw_clr_create(drw, &ret[i], clrnames[i]);
	222 return ret;
	223 }
	224
	225 void
	226 drw_setfontset(Drw drw, Fnt set)
	227 {
	228 if (drw)
	229 drw->fonts = set;
	230 }
	231
	232 void
	233 drw_setscheme(Drw drw, Clr scm)
	234 {
	235 if (drw)
	236 drw->scheme = scm;
	237 }
	238
	239 void
	240 drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int fil…
	241 {
	242 if (!drw \|\| !drw->scheme)
	243 return;
	244 XSetForeground(drw->dpy, drw->gc, invert ? drw->scheme[ColBg].pi…
	245 if (filled)
	246 XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w…
	247 else
	248 XDrawRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w…
	249 }
	250
	251 int
	252 drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigne…
	253 {
	254 char buf[1024];
	255 int ty;
	256 unsigned int ew;
	257 XftDraw *d = NULL;
	258 Fnt usedfont, curfont, *nextfont;
	259 size_t i, len;
	260 int utf8strlen, utf8charlen, render = x \|\| y \|\| w \|\| h;
	261 long utf8codepoint = 0;
	262 const char *utf8str;
	263 FcCharSet *fccharset;
	264 FcPattern *fcpattern;
	265 FcPattern *match;
	266 XftResult result;
	267 int charexists = 0;
	268
	269 if (!drw \|\| (render && !drw->scheme) \|\| !text \|\| !drw->fonts)
	270 return 0;
	271
	272 if (!render) {
	273 w = ~w;
	274 } else {
	275 XSetForeground(drw->dpy, drw->gc, drw->scheme[invert ? C…
	276 XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w…
	277 d = XftDrawCreate(drw->dpy, drw->drawable,
	278 DefaultVisual(drw->dpy, drw->screen),
	279 DefaultColormap(drw->dpy, drw->screen)…
	280 x += lpad;
	281 w -= lpad;
	282 }
	283
	284 usedfont = drw->fonts;
	285 while (1) {
	286 utf8strlen = 0;
	287 utf8str = text;
	288 nextfont = NULL;
	289 while (*text) {
	290 utf8charlen = utf8decode(text, &utf8codepoint, U…
	291 for (curfont = drw->fonts; curfont; curfont = cu…
	292 charexists = charexists \|\| XftCharExists…
	293 if (charexists) {
	294 if (curfont == usedfont) {
	295 utf8strlen += utf8charle…
	296 text += utf8charlen;
	297 } else {
	298 nextfont = curfont;
	299 }
	300 break;
	301 }
	302 }
	303
	304 if (!charexists \|\| nextfont)
	305 break;
	306 else
	307 charexists = 0;
	308 }
	309
	310 if (utf8strlen) {
	311 drw_font_getexts(usedfont, utf8str, utf8strlen, …
	312 /* shorten text if necessary */
	313 for (len = MIN(utf8strlen, sizeof(buf) - 1); len…
	314 drw_font_getexts(usedfont, utf8str, len,…
	315
	316 if (len) {
	317 memcpy(buf, utf8str, len);
	318 buf[len] = '\0';
	319 if (len < utf8strlen)
	320 for (i = len; i && i > len - 3; …
	321 ; /* NOP */
	322
	323 if (render) {
	324 ty = y + (h - usedfont->h) / 2 +…
	325 XftDrawStringUtf8(d, &drw->schem…
	326 usedfont->xfon…
	327 }
	328 x += ew;
	329 w -= ew;
	330 }
	331 }
	332
	333 if (!*text) {
	334 break;
	335 } else if (nextfont) {
	336 charexists = 0;
	337 usedfont = nextfont;
	338 } else {
	339 /* Regardless of whether or not a fallback font …
	340 * character must be drawn. */
	341 charexists = 1;
	342
	343 fccharset = FcCharSetCreate();
	344 FcCharSetAddChar(fccharset, utf8codepoint);
	345
	346 if (!drw->fonts->pattern) {
	347 /* Refer to the comment in xfont_create …
	348 die("the first font in the cache must be…
	349 }
	350
	351 fcpattern = FcPatternDuplicate(drw->fonts->patte…
	352 FcPatternAddCharSet(fcpattern, FC_CHARSET, fccha…
	353 FcPatternAddBool(fcpattern, FC_SCALABLE, FcTrue);
	354 FcPatternAddBool(fcpattern, FC_COLOR, FcFalse);
	355
	356 FcConfigSubstitute(NULL, fcpattern, FcMatchPatte…
	357 FcDefaultSubstitute(fcpattern);
	358 match = XftFontMatch(drw->dpy, drw->screen, fcpa…
	359
	360 FcCharSetDestroy(fccharset);
	361 FcPatternDestroy(fcpattern);
	362
	363 if (match) {
	364 usedfont = xfont_create(drw, NULL, match…
	365 if (usedfont && XftCharExists(drw->dpy, …
	366 for (curfont = drw->fonts; curfo…
	367 ; /* NOP */
	368 curfont->next = usedfont;
	369 } else {
	370 xfont_free(usedfont);
	371 usedfont = drw->fonts;
	372 }
	373 }
	374 }
	375 }
	376 if (d)
	377 XftDrawDestroy(d);
	378
	379 return x + (render ? w : 0);
	380 }
	381
	382 void
	383 drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int…
	384 {
	385 if (!drw)
	386 return;
	387
	388 XCopyArea(drw->dpy, drw->drawable, win, drw->gc, x, y, w, h, x, …
	389 }
	390
	391 void
	392 drw_sync(Drw *drw)
	393 {
	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 void
	406 drw_font_getexts(Fnt font, const char text, unsigned int len, unsigned…
	407 {
	408 XGlyphInfo ext;
	409
	410 if (!font \|\| !text)
	411 return;
	412
	413 XftTextExtentsUtf8(font->dpy, font->xfont, (XftChar8 *)text, len…
	414 if (w)
	415 *w = ext.xOff;
	416 if (h)
	417 *h = font->h;
	418 }