cmdtree

A trie command launcher for X11
git clone git://jb55.com/cmdtree
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drw.c (8864B)

      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 
     12 Drw *
     13 drw_create(Display *dpy, int screen, Window root, unsigned int w, unsigned int h)
     14 {
     15 	Drw *drw = ecalloc(1, sizeof(Drw));
     16 
     17 	drw->dpy = dpy;
     18 	drw->screen = screen;
     19 	drw->root = root;
     20 	drw->w = w;
     21 	drw->h = h;
     22 	drw->drawable = XCreatePixmap(dpy, root, w, h, DefaultDepth(dpy, screen));
     23 	drw->gc = XCreateGC(dpy, root, 0, NULL);
     24 	XSetLineAttributes(dpy, drw->gc, 1, LineSolid, CapButt, JoinMiter);
     25 
     26 	return drw;
     27 }
     28 
     29 void
     30 drw_resize(Drw *drw, unsigned int w, unsigned int h)
     31 {
     32 	if (!drw)
     33 		return;
     34 
     35 	drw->w = w;
     36 	drw->h = h;
     37 	if (drw->drawable)
     38 		XFreePixmap(drw->dpy, drw->drawable);
     39 	drw->drawable = XCreatePixmap(drw->dpy, drw->root, w, h,
     40 				      DefaultDepth(drw->dpy, drw->screen));
     41 }
     42 
     43 void
     44 drw_free(Drw *drw)
     45 {
     46 	XFreePixmap(drw->dpy, drw->drawable);
     47 	XFreeGC(drw->dpy, drw->gc);
     48 	free(drw);
     49 }
     50 
     51 /* This function is an implementation detail. Library users should use
     52  * drw_fontset_create instead.
     53  */
     54 static Fnt *
     55 xfont_create(Drw *drw, const char *fontname, FcPattern *fontpattern)
     56 {
     57 	Fnt *font;
     58 	XftFont *xfont = NULL;
     59 	FcPattern *pattern = NULL;
     60 
     61 	if (fontname) {
     62 		/* Using the pattern found at font->xfont->pattern does not yield the
     63 		 * same substitution results as using the pattern returned by
     64 		 * FcNameParse; using the latter results in the desired fallback
     65 		 * behaviour whereas the former just results in missing-character
     66 		 * rectangles being drawn, at least with some fonts. */
     67 		if (!(xfont = XftFontOpenName(drw->dpy, drw->screen, fontname))) {
     68 			fprintf(stderr, "error, cannot load font from name: '%s'\n", fontname);
     69 			return NULL;
     70 		}
     71 		if (!(pattern = FcNameParse((FcChar8 *) fontname))) {
     72 			fprintf(stderr, "error, cannot parse font name to pattern: '%s'\n", fontname);
     73 			XftFontClose(drw->dpy, xfont);
     74 			return NULL;
     75 		}
     76 	} else if (fontpattern) {
     77 		if (!(xfont = XftFontOpenPattern(drw->dpy, fontpattern))) {
     78 			fprintf(stderr, "error, cannot load font from pattern.\n");
     79 			return NULL;
     80 		}
     81 	} else {
     82 		die("no font specified.");
     83 	}
     84 
     85 	font = ecalloc(1, sizeof(Fnt));
     86 	font->xfont = xfont;
     87 	font->pattern = pattern;
     88 	font->h = xfont->ascent + xfont->descent;
     89 	font->dpy = drw->dpy;
     90 
     91 	return font;
     92 }
     93 
     94 static void
     95 xfont_free(Fnt *font)
     96 {
     97 	if (!font)
     98 		return;
     99 	if (font->pattern)
    100 		FcPatternDestroy(font->pattern);
    101 	XftFontClose(font->dpy, font->xfont);
    102 	free(font);
    103 }
    104 
    105 Fnt*
    106 drw_fontset_create(Drw* drw, const char *fonts[], size_t fontcount)
    107 {
    108 	Fnt *cur, *ret = NULL;
    109 	size_t i;
    110 
    111 	if (!drw || !fonts)
    112 		return NULL;
    113 
    114 	for (i = 1; i <= fontcount; i++) {
    115 		if ((cur = xfont_create(drw, fonts[fontcount - i], NULL))) {
    116 			cur->next = ret;
    117 			ret = cur;
    118 		}
    119 	}
    120 	return (drw->fonts = ret);
    121 }
    122 
    123 void
    124 drw_fontset_free(Fnt *font)
    125 {
    126 	if (font) {
    127 		drw_fontset_free(font->next);
    128 		xfont_free(font);
    129 	}
    130 }
    131 
    132 void
    133 drw_clr_create(Drw *drw, Clr *dest, const char *clrname)
    134 {
    135 	if (!drw || !dest || !clrname)
    136 		return;
    137 
    138 	if (!XftColorAllocName(drw->dpy, DefaultVisual(drw->dpy, drw->screen),
    139 	                       DefaultColormap(drw->dpy, drw->screen),
    140 	                       clrname, dest))
    141 		die("error, cannot allocate color '%s'", clrname);
    142 }
    143 
    144 /* Wrapper to create color schemes. The caller has to call free(3) on the
    145  * returned color scheme when done using it. */
    146 void
    147 drw_scm_create(Drw *drw, struct scheme *schemes, size_t clrcount)
    148 {
    149 	size_t i;
    150 
    151 	/* need at least two colors for a scheme */
    152 	if (!drw || !schemes)
    153 		return;
    154 
    155 	for (i = 0; i < clrcount; i++) {
    156 		drw_clr_create(drw, &schemes[i].bind_clr, schemes[i].bind);
    157 		drw_clr_create(drw, &schemes[i].bg_clr,   schemes[i].bg);
    158 		drw_clr_create(drw, &schemes[i].name_clr, schemes[i].name);
    159 		drw_clr_create(drw, &schemes[i].arrow_clr, schemes[i].arrow);
    160 	}
    161 
    162 	return;
    163 }
    164 
    165 void
    166 drw_setfontset(Drw *drw, Fnt *set)
    167 {
    168 	if (drw)
    169 		drw->fonts = set;
    170 }
    171 
    172 void
    173 drw_setscheme(Drw *drw, Clr *fg, Clr *bg)
    174 {
    175 	drw->scheme[ColBg] = bg;
    176 	drw->scheme[ColFg] = fg;
    177 }
    178 
    179 void
    180 drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int filled, int invert)
    181 {
    182 	if (!drw)
    183 		return;
    184 	XSetForeground(drw->dpy, drw->gc,
    185 		       invert ? drw->scheme[ColBg]->pixel
    186 		              : drw->scheme[ColFg]->pixel);
    187 	if (filled)
    188 		XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
    189 	else
    190 		XDrawRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w - 1,
    191 			       h - 1);
    192 }
    193 
    194 int
    195 drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h,
    196 	 unsigned int lpad, const char *text, int invert) {
    197 	char buf[1024];
    198 	int ty;
    199 	unsigned int ew;
    200 	XftDraw *d = NULL;
    201 	Fnt *usedfont, *curfont, *nextfont;
    202 	size_t i, len;
    203 	int utf8strlen, utf8charlen, render = x || y || w || h;
    204 	long utf8codepoint = 0;
    205 	const char *utf8str;
    206 	FcCharSet *fccharset;
    207 	FcPattern *fcpattern;
    208 	FcPattern *match;
    209 	XftResult result;
    210 	int charexists = 0;
    211 
    212 	if (!drw || (render && !drw->scheme[0]) || !text || !drw->fonts)
    213 		return 0;
    214 
    215 	if (!render) {
    216 		w = ~w;
    217 	} else {
    218 		XSetForeground(drw->dpy, drw->gc, drw->scheme[invert ? ColFg : ColBg]->pixel);
    219 		XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
    220 		d = XftDrawCreate(drw->dpy, drw->drawable,
    221 		                  DefaultVisual(drw->dpy, drw->screen),
    222 		                  DefaultColormap(drw->dpy, drw->screen));
    223 		x += lpad;
    224 		w -= lpad;
    225 	}
    226 
    227 	usedfont = drw->fonts;
    228 	while (1) {
    229 		utf8strlen = 0;
    230 		utf8str = text;
    231 		nextfont = NULL;
    232 		while (*text) {
    233 			utf8charlen = utf8decode(text, &utf8codepoint, UTF_SIZ);
    234 			for (curfont = drw->fonts; curfont; curfont = curfont->next) {
    235 				charexists = charexists || XftCharExists(drw->dpy, curfont->xfont, utf8codepoint);
    236 				if (charexists) {
    237 					if (curfont == usedfont) {
    238 						utf8strlen += utf8charlen;
    239 						text += utf8charlen;
    240 					} else {
    241 						nextfont = curfont;
    242 					}
    243 					break;
    244 				}
    245 			}
    246 
    247 			if (!charexists || nextfont)
    248 				break;
    249 			else
    250 				charexists = 0;
    251 		}
    252 
    253 		if (utf8strlen) {
    254 			drw_font_getexts(usedfont, utf8str, utf8strlen, &ew, NULL);
    255 			/* shorten text if necessary */
    256 			for (len = MIN(utf8strlen, sizeof(buf) - 1); len && ew > w; len--)
    257 				drw_font_getexts(usedfont, utf8str, len, &ew, NULL);
    258 
    259 			if (len) {
    260 				memcpy(buf, utf8str, len);
    261 				buf[len] = '\0';
    262 				if (len < utf8strlen)
    263 					for (i = len; i && i > len - 3; buf[--i] = '.')
    264 						; /* NOP */
    265 
    266 				if (render) {
    267 					Clr *c = drw->scheme[invert ? ColBg : ColFg];
    268 					ty = y + (h - usedfont->h) / 2 + usedfont->xfont->ascent;
    269 					XftDrawStringUtf8(d, c, usedfont->xfont,
    270 							  x, ty, (XftChar8 *)buf,
    271 							  len);
    272 				}
    273 				x += ew;
    274 				w -= ew;
    275 			}
    276 		}
    277 
    278 		if (!*text) {
    279 			break;
    280 		} else if (nextfont) {
    281 			charexists = 0;
    282 			usedfont = nextfont;
    283 		} else {
    284 			/* Regardless of whether or not a fallback font is found, the
    285 			 * character must be drawn. */
    286 			charexists = 1;
    287 
    288 			fccharset = FcCharSetCreate();
    289 			FcCharSetAddChar(fccharset, utf8codepoint);
    290 
    291 			if (!drw->fonts->pattern) {
    292 				/* Refer to the comment in xfont_create for more information. */
    293 				die("the first font in the cache must be loaded from a font string.");
    294 			}
    295 
    296 			fcpattern = FcPatternDuplicate(drw->fonts->pattern);
    297 			FcPatternAddCharSet(fcpattern, FC_CHARSET, fccharset);
    298 			FcPatternAddBool(fcpattern, FC_SCALABLE, FcTrue);
    299 
    300 			FcConfigSubstitute(NULL, fcpattern, FcMatchPattern);
    301 			FcDefaultSubstitute(fcpattern);
    302 			match = XftFontMatch(drw->dpy, drw->screen, fcpattern, &result);
    303 
    304 			FcCharSetDestroy(fccharset);
    305 			FcPatternDestroy(fcpattern);
    306 
    307 			if (match) {
    308 				usedfont = xfont_create(drw, NULL, match);
    309 				if (usedfont && XftCharExists(drw->dpy, usedfont->xfont, utf8codepoint)) {
    310 					for (curfont = drw->fonts; curfont->next; curfont = curfont->next)
    311 						; /* NOP */
    312 					curfont->next = usedfont;
    313 				} else {
    314 					xfont_free(usedfont);
    315 					usedfont = drw->fonts;
    316 				}
    317 			}
    318 		}
    319 	}
    320 	if (d)
    321 		XftDrawDestroy(d);
    322 
    323 	return x + (render ? w : 0);
    324 }
    325 
    326 
    327 void
    328 drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int h)
    329 {
    330 	if (!drw)
    331 		return;
    332 
    333 	XCopyArea(drw->dpy, drw->drawable, win, drw->gc, x, y, w, h, x, y);
    334 	XSync(drw->dpy, False);
    335 }
    336 
    337 unsigned int
    338 drw_fontset_getwidth(Drw *drw, const char *text)
    339 {
    340 	if (!drw || !drw->fonts || !text)
    341 		return 0;
    342 	return drw_text(drw, 0, 0, 0, 0, 0, text, 0);
    343 }
    344 
    345 void
    346 drw_font_getexts(Fnt *font, const char *text, unsigned int len, unsigned int *w,
    347 		 unsigned int *h)
    348 {
    349 	XGlyphInfo ext;
    350 
    351 	if (!font || !text)
    352 		return;
    353 
    354 	XftTextExtentsUtf8(font->dpy, font->xfont, (XftChar8 *)text, len, &ext);
    355 	if (w)
    356 		*w = ext.xOff;
    357 	if (h)
    358 		*h = font->h;
    359 }
    360 
    361 Cur *
    362 drw_cur_create(Drw *drw, int shape)
    363 {
    364 	Cur *cur;
    365 
    366 	if (!drw || !(cur = ecalloc(1, sizeof(Cur))))
    367 		return NULL;
    368 
    369 	cur->cursor = XCreateFontCursor(drw->dpy, shape);
    370 
    371 	return cur;
    372 }
    373 
    374 void
    375 drw_cur_free(Drw *drw, Cur *cursor)
    376 {
    377 	if (!cursor)
    378 		return;
    379 
    380 	XFreeCursor(drw->dpy, cursor->cursor);
    381 	free(cursor);
    382 }