/* 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 longutf8decodebyte(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_tutf8validate(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_tutf8decode(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;} voiddrw_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));} voiddrw_free(Drw *drw){	XFreePixmap(drw->dpy, drw->drawable);	XFreeGC(drw->dpy, drw->gc);	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 voidxfont_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);} voiddrw_fontset_free(Fnt *font){	if (font) {		drw_fontset_free(font->next);		xfont_free(font);	}} voiddrw_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;} voiddrw_setfontset(Drw *drw, Fnt *set){	if (drw)		drw->fonts = set;} voiddrw_setscheme(Drw *drw, Clr *scm){	if (drw)		drw->scheme = scm;} voiddrw_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);} intdrw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lpad, const char *text, int invert){	char buf[1024];	int ty;	unsigned int ew;	XftDraw *d = NULL;	Fnt *usedfont, *curfont, *nextfont;	size_t i, len;	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; 	if (!drw || (render && !drw->scheme) || !text || !drw->fonts)		return 0; 	if (!render) {		w = ~w;	} 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;	while (1) {		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) {					if (curfont == usedfont) {						utf8strlen += utf8charlen;						text += utf8charlen;					} else {						nextfont = curfont;					}					break;				}			} 			if (!charexists || nextfont)				break;			else				charexists = 0;		} 		if (utf8strlen) {			drw_font_getexts(usedfont, utf8str, utf8strlen, &ew, NULL);			/* shorten text if necessary */			for (len = MIN(utf8strlen, sizeof(buf) - 1); len && ew > w; len--)				drw_font_getexts(usedfont, utf8str, len, &ew, NULL); 			if (len) {				memcpy(buf, utf8str, len);				buf[len] = '\0';				if (len < utf8strlen)					for (i = len; i && i > len - 3; buf[--i] = '.')						; /* NOP */ 				if (render) {					ty = y + (h - usedfont->h) / 2 + usedfont->xfont->ascent;					XftDrawStringUtf8(d, &drw->scheme[invert ? ColBg : ColFg],					                  usedfont->xfont, x, ty, (XftChar8 *)buf, len);				}				x += ew;				w -= ew;			}		} 		if (!*text) {			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; 			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);					usedfont = drw->fonts;				}			}		}	}	if (d)		XftDrawDestroy(d); 	return x + (render ? w : 0);} voiddrw_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 intdrw_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);} voiddrw_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;} voiddrw_cur_free(Drw *drw, Cur *cursor){	if (!cursor)		return; 	XFreeCursor(drw->dpy, cursor->cursor);	free(cursor);}