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drw.c (11041B) - raw

---

 /* See LICENSE file for copyright and license details. */
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <X11/Xlib.h>
 #include <X11/Xft/Xft.h>
 
 #include "drw.h"
 #include "util.h"
 
 #define UTF_INVALID 0xFFFD
 #define UTF_SIZ     4
 
 static const unsigned char utfbyte[UTF_SIZ + 1] = {0x80,    0, 0xC0, 0xE0, 0xF0};
 static const unsigned char utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
 static const long utfmin[UTF_SIZ + 1] = {       0,    0,  0x80,  0x800,  0x10000};
 static const long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
 
 static long
 utf8decodebyte(const char c, size_t *i)
 {
 	for (*i = 0; *i < (UTF_SIZ + 1); ++(*i))
 		if (((unsigned char)c & utfmask[*i]) == utfbyte[*i])
 			return (unsigned char)c & ~utfmask[*i];
 	return 0;
 }
 
 static size_t
 utf8validate(long *u, size_t i)
 {
 	if (!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
 		*u = UTF_INVALID;
 	for (i = 1; *u > utfmax[i]; ++i)
 		;
 	return i;
 }
 
 static size_t
 utf8decode(const char *c, long *u, size_t clen)
 {
 	size_t i, j, len, type;
 	long udecoded;
 
 	*u = UTF_INVALID;
 	if (!clen)
 		return 0;
 	udecoded = utf8decodebyte(c[0], &len);
 	if (!BETWEEN(len, 1, UTF_SIZ))
 		return 1;
 	for (i = 1, j = 1; i < clen && j < len; ++i, ++j) {
 		udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
 		if (type)
 			return j;
 	}
 	if (j < len)
 		return 0;
 	*u = udecoded;
 	utf8validate(u, len);
 
 	return len;
 }
 
 Drw *
 drw_create(Display *dpy, int screen, Window root, unsigned int w, unsigned int h)
 {
 	Drw *drw = ecalloc(1, sizeof(Drw));
 
 	drw->dpy = dpy;
 	drw->screen = screen;
 	drw->root = root;
 	drw->w = w;
 	drw->h = h;
 	drw->drawable = XCreatePixmap(dpy, root, w, h, DefaultDepth(dpy, screen));
 	drw->gc = XCreateGC(dpy, root, 0, NULL);
 	XSetLineAttributes(dpy, drw->gc, 1, LineSolid, CapButt, JoinMiter);
 
 	return drw;
 }
 
 void
 drw_resize(Drw *drw, unsigned int w, unsigned int h)
 {
 	if (!drw)
 		return;
 
 	drw->w = w;
 	drw->h = h;
 	if (drw->drawable)
 		XFreePixmap(drw->dpy, drw->drawable);
 	drw->drawable = XCreatePixmap(drw->dpy, drw->root, w, h, DefaultDepth(drw->dpy, drw->screen));
 }
 
 void
 drw_free(Drw *drw)
 {
 	XFreePixmap(drw->dpy, drw->drawable);
 	XFreeGC(drw->dpy, drw->gc);
 	drw_fontset_free(drw->fonts);
 	free(drw);
 }
 
 /* This function is an implementation detail. Library users should use
  * drw_fontset_create instead.
  */
 static Fnt *
 xfont_create(Drw *drw, const char *fontname, FcPattern *fontpattern)
 {
 	Fnt *font;
 	XftFont *xfont = NULL;
 	FcPattern *pattern = NULL;
 
 	if (fontname) {
 		/* Using the pattern found at font->xfont->pattern does not yield the
 		 * same substitution results as using the pattern returned by
 		 * FcNameParse; using the latter results in the desired fallback
 		 * behaviour whereas the former just results in missing-character
 		 * rectangles being drawn, at least with some fonts. */
 		if (!(xfont = XftFontOpenName(drw->dpy, drw->screen, fontname))) {
 			fprintf(stderr, "error, cannot load font from name: '%s'\n", fontname);
 			return NULL;
 		}
 		if (!(pattern = FcNameParse((FcChar8 *) fontname))) {
 			fprintf(stderr, "error, cannot parse font name to pattern: '%s'\n", fontname);
 			XftFontClose(drw->dpy, xfont);
 			return NULL;
 		}
 	} else if (fontpattern) {
 		if (!(xfont = XftFontOpenPattern(drw->dpy, fontpattern))) {
 			fprintf(stderr, "error, cannot load font from pattern.\n");
 			return NULL;
 		}
 	} else {
 		die("no font specified.");
 	}
 
 	font = ecalloc(1, sizeof(Fnt));
 	font->xfont = xfont;
 	font->pattern = pattern;
 	font->h = xfont->ascent + xfont->descent;
 	font->dpy = drw->dpy;
 
 	return font;
 }
 
 static void
 xfont_free(Fnt *font)
 {
 	if (!font)
 		return;
 	if (font->pattern)
 		FcPatternDestroy(font->pattern);
 	XftFontClose(font->dpy, font->xfont);
 	free(font);
 }
 
 Fnt*
 drw_fontset_create(Drw* drw, const char *fonts[], size_t fontcount)
 {
 	Fnt *cur, *ret = NULL;
 	size_t i;
 
 	if (!drw || !fonts)
 		return NULL;
 
 	for (i = 1; i <= fontcount; i++) {
 		if ((cur = xfont_create(drw, fonts[fontcount - i], NULL))) {
 			cur->next = ret;
 			ret = cur;
 		}
 	}
 	return (drw->fonts = ret);
 }
 
 void
 drw_fontset_free(Fnt *font)
 {
 	if (font) {
 		drw_fontset_free(font->next);
 		xfont_free(font);
 	}
 }
 
 void
 drw_clr_create(Drw *drw, Clr *dest, const char *clrname)
 {
 	if (!drw || !dest || !clrname)
 		return;
 
 	if (!XftColorAllocName(drw->dpy, DefaultVisual(drw->dpy, drw->screen),
 	                       DefaultColormap(drw->dpy, drw->screen),
 	                       clrname, dest))
 		die("error, cannot allocate color '%s'", clrname);
 }
 
 /* Wrapper to create color schemes. The caller has to call free(3) on the
  * returned color scheme when done using it. */
 Clr *
 drw_scm_create(Drw *drw, const char *clrnames[], size_t clrcount)
 {
 	size_t i;
 	Clr *ret;
 
 	/* need at least two colors for a scheme */
 	if (!drw || !clrnames || clrcount < 2 || !(ret = ecalloc(clrcount, sizeof(XftColor))))
 		return NULL;
 
 	for (i = 0; i < clrcount; i++)
 		drw_clr_create(drw, &ret[i], clrnames[i]);
 	return ret;
 }
 
 void
 drw_setfontset(Drw *drw, Fnt *set)
 {
 	if (drw)
 		drw->fonts = set;
 }
 
 void
 drw_setscheme(Drw *drw, Clr *scm)
 {
 	if (drw)
 		drw->scheme = scm;
 }
 
 void
 drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int filled, int invert)
 {
 	if (!drw || !drw->scheme)
 		return;
 	XSetForeground(drw->dpy, drw->gc, invert ? drw->scheme[ColBg].pixel : drw->scheme[ColFg].pixel);
 	if (filled)
 		XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
 	else
 		XDrawRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w - 1, h - 1);
 }
 
 int
 drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lpad, const char *text, int invert)
 {
 	int i, ty, ellipsis_x = 0;
 	unsigned int tmpw, ew, ellipsis_w = 0, ellipsis_len;
 	XftDraw *d = NULL;
 	Fnt *usedfont, *curfont, *nextfont;
 	int utf8strlen, utf8charlen, render = x || y || w || h;
 	long utf8codepoint = 0;
 	const char *utf8str;
 	FcCharSet *fccharset;
 	FcPattern *fcpattern;
 	FcPattern *match;
 	XftResult result;
 	int charexists = 0, overflow = 0;
 	/* keep track of a couple codepoints for which we have no match. */
 	enum { nomatches_len = 64 };
 	static struct { long codepoint[nomatches_len]; unsigned int idx; } nomatches;
 	static unsigned int ellipsis_width = 0;
 
 	if (!drw || (render && (!drw->scheme || !w)) || !text || !drw->fonts)
 		return 0;
 
 	if (!render) {
 		w = invert ? invert : ~invert;
 	} else {
 		XSetForeground(drw->dpy, drw->gc, drw->scheme[invert ? ColFg : ColBg].pixel);
 		XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
 		d = XftDrawCreate(drw->dpy, drw->drawable,
 		                  DefaultVisual(drw->dpy, drw->screen),
 		                  DefaultColormap(drw->dpy, drw->screen));
 		x += lpad;
 		w -= lpad;
 	}
 
 	usedfont = drw->fonts;
 	if (!ellipsis_width && render)
 		ellipsis_width = drw_fontset_getwidth(drw, "...");
 	while (1) {
 		ew = ellipsis_len = utf8strlen = 0;
 		utf8str = text;
 		nextfont = NULL;
 		while (*text) {
 			utf8charlen = utf8decode(text, &utf8codepoint, UTF_SIZ);
 			for (curfont = drw->fonts; curfont; curfont = curfont->next) {
 				charexists = charexists || XftCharExists(drw->dpy, curfont->xfont, utf8codepoint);
 				if (charexists) {
 					drw_font_getexts(curfont, text, utf8charlen, &tmpw, NULL);
 					if (ew + ellipsis_width <= w) {
 						/* keep track where the ellipsis still fits */
 						ellipsis_x = x + ew;
 						ellipsis_w = w - ew;
 						ellipsis_len = utf8strlen;
 					}
 
 					if (ew + tmpw > w) {
 						overflow = 1;
 						/* called from drw_fontset_getwidth_clamp():
 						 * it wants the width AFTER the overflow
 						 */
 						if (!render)
 							x += tmpw;
 						else
 							utf8strlen = ellipsis_len;
 					} else if (curfont == usedfont) {
 						utf8strlen += utf8charlen;
 						text += utf8charlen;
 						ew += tmpw;
 					} else {
 						nextfont = curfont;
 					}
 					break;
 				}
 			}
 
 			if (overflow || !charexists || nextfont)
 				break;
 			else
 				charexists = 0;
 		}
 
 		if (utf8strlen) {
 			if (render) {
 				ty = y + (h - usedfont->h) / 2 + usedfont->xfont->ascent;
 				XftDrawStringUtf8(d, &drw->scheme[invert ? ColBg : ColFg],
 				                  usedfont->xfont, x, ty, (XftChar8 *)utf8str, utf8strlen);
 			}
 			x += ew;
 			w -= ew;
 		}
 		if (render && overflow)
 			drw_text(drw, ellipsis_x, y, ellipsis_w, h, 0, "...", invert);
 
 		if (!*text || overflow) {
 			break;
 		} else if (nextfont) {
 			charexists = 0;
 			usedfont = nextfont;
 		} else {
 			/* Regardless of whether or not a fallback font is found, the
 			 * character must be drawn. */
 			charexists = 1;
 
 			for (i = 0; i < nomatches_len; ++i) {
 				/* avoid calling XftFontMatch if we know we won't find a match */
 				if (utf8codepoint == nomatches.codepoint[i])
 					goto no_match;
 			}
 
 			fccharset = FcCharSetCreate();
 			FcCharSetAddChar(fccharset, utf8codepoint);
 
 			if (!drw->fonts->pattern) {
 				/* Refer to the comment in xfont_create for more information. */
 				die("the first font in the cache must be loaded from a font string.");
 			}
 
 			fcpattern = FcPatternDuplicate(drw->fonts->pattern);
 			FcPatternAddCharSet(fcpattern, FC_CHARSET, fccharset);
 			FcPatternAddBool(fcpattern, FC_SCALABLE, FcTrue);
 
 			FcConfigSubstitute(NULL, fcpattern, FcMatchPattern);
 			FcDefaultSubstitute(fcpattern);
 			match = XftFontMatch(drw->dpy, drw->screen, fcpattern, &result);
 
 			FcCharSetDestroy(fccharset);
 			FcPatternDestroy(fcpattern);
 
 			if (match) {
 				usedfont = xfont_create(drw, NULL, match);
 				if (usedfont && XftCharExists(drw->dpy, usedfont->xfont, utf8codepoint)) {
 					for (curfont = drw->fonts; curfont->next; curfont = curfont->next)
 						; /* NOP */
 					curfont->next = usedfont;
 				} else {
 					xfont_free(usedfont);
 					nomatches.codepoint[++nomatches.idx % nomatches_len] = utf8codepoint;
 no_match:
 					usedfont = drw->fonts;
 				}
 			}
 		}
 	}
 	if (d)
 		XftDrawDestroy(d);
 
 	return x + (render ? w : 0);
 }
 
 void
 drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int h)
 {
 	if (!drw)
 		return;
 
 	XCopyArea(drw->dpy, drw->drawable, win, drw->gc, x, y, w, h, x, y);
 	XSync(drw->dpy, False);
 }
 
 unsigned int
 drw_fontset_getwidth(Drw *drw, const char *text)
 {
 	if (!drw || !drw->fonts || !text)
 		return 0;
 	return drw_text(drw, 0, 0, 0, 0, 0, text, 0);
 }
 
 unsigned int
 drw_fontset_getwidth_clamp(Drw *drw, const char *text, unsigned int n)
 {
 	unsigned int tmp = 0;
 	if (drw && drw->fonts && text && n)
 		tmp = drw_text(drw, 0, 0, 0, 0, 0, text, n);
 	return MIN(n, tmp);
 }
 
 void
 drw_font_getexts(Fnt *font, const char *text, unsigned int len, unsigned int *w, unsigned int *h)
 {
 	XGlyphInfo ext;
 
 	if (!font || !text)
 		return;
 
 	XftTextExtentsUtf8(font->dpy, font->xfont, (XftChar8 *)text, len, &ext);
 	if (w)
 		*w = ext.xOff;
 	if (h)
 		*h = font->h;
 }
 
 Cur *
 drw_cur_create(Drw *drw, int shape)
 {
 	Cur *cur;
 
 	if (!drw || !(cur = ecalloc(1, sizeof(Cur))))
 		return NULL;
 
 	cur->cursor = XCreateFontCursor(drw->dpy, shape);
 
 	return cur;
 }
 
 void
 drw_cur_free(Drw *drw, Cur *cursor)
 {
 	if (!cursor)
 		return;
 
 	XFreeCursor(drw->dpy, cursor->cursor);
 	free(cursor);
 }