X-Git-Url: https://git.danieliu.xyz/?p=dwm.git;a=blobdiff_plain;f=drw.c;h=8f1059e963aba9b8af48821e68b1bf27979ff439;hp=65fd870d2dd5d6b96a9aa402aa2b287dde54db00;hb=HEAD;hpb=f2544a331845ad80655c1f79c9dc61922fe3441c

diff --git a/drw.c b/drw.c
index 65fd870..8f1059e 100644
--- a/drw.c
+++ b/drw.c
@@ -3,200 +3,434 @@
 #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 win, unsigned int w, unsigned int h) {
-	Drw *drw = (Drw *)calloc(1, sizeof(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->win = win;
+	drw->root = root;
 	drw->w = w;
 	drw->h = h;
-	drw->drwable = XCreatePixmap(dpy, win, w, h, DefaultDepth(dpy, screen));
-	drw->gc = XCreateGC(dpy, win, 0, NULL);
+	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)
+drw_resize(Drw *drw, unsigned int w, unsigned int h)
+{
+	if (!drw)
 		return;
+
 	drw->w = w;
 	drw->h = h;
-	XFreePixmap(drw->dpy, drw->drwable);
-	drw->drwable = XCreatePixmap(drw->dpy, drw->win, w, h, DefaultDepth(drw->dpy, drw->screen));
+	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->drwable);
+drw_free(Drw *drw)
+{
+	XFreePixmap(drw->dpy, drw->drawable);
 	XFreeGC(drw->dpy, drw->gc);
+	drw_fontset_free(drw->fonts);
 	free(drw);
 }
 
-Fnt *
-drw_font_create(Drw *drw, const char *fontname) {
+/* 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;
-	char *def, **missing;
-	int n;
+	XftFont *xfont = NULL;
+	FcPattern *pattern = NULL;
 
-	if(!drw)
-		return NULL;
-	font = (Fnt *)calloc(1, sizeof(Fnt));
-	font->set = XCreateFontSet(drw->dpy, fontname, &missing, &n, &def);
-	if(missing) {
-		while(n--)
-			fprintf(stderr, "drw: missing fontset: %s\n", missing[n]);
-		XFreeStringList(missing);
-	}
-	if(font->set) {
-		XFontStruct **xfonts;
-		char **font_names;
-		XExtentsOfFontSet(font->set);
-		n = XFontsOfFontSet(font->set, &xfonts, &font_names);
-		while(n--) {
-			font->ascent = MAX(font->ascent, (*xfonts)->ascent);
-			font->descent = MAX(font->descent,(*xfonts)->descent);
-			xfonts++;
+	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.");
 	}
-	else {
-		if(!(font->xfont = XLoadQueryFont(drw->dpy, fontname))
-		&& !(font->xfont = XLoadQueryFont(drw->dpy, "fixed")))
-			die("error, cannot load font: '%s'\n", fontname);
-		font->ascent = font->xfont->ascent;
-		font->descent = font->xfont->descent;
+
+	/* Do not allow using color fonts. This is a workaround for a BadLength
+	 * error from Xft with color glyphs. Modelled on the Xterm workaround. See
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=1498269
+	 * https://lists.suckless.org/dev/1701/30932.html
+	 * https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=916349
+	 * and lots more all over the internet.
+	 */
+	FcBool iscol;
+	if(FcPatternGetBool(xfont->pattern, FC_COLOR, 0, &iscol) == FcResultMatch && iscol) {
+		XftFontClose(drw->dpy, xfont);
+		return NULL;
 	}
-	font->h = font->ascent + font->descent;
+
+	font = ecalloc(1, sizeof(Fnt));
+	font->xfont = xfont;
+	font->pattern = pattern;
+	font->h = xfont->ascent + xfont->descent;
+	font->dpy = drw->dpy;
+
 	return font;
 }
 
-void
-drw_font_free(Drw *drw, Fnt *font) {
-	if(!drw || !font)
+static void
+xfont_free(Fnt *font)
+{
+	if (!font)
 		return;
-	if(font->set)
-		XFreeFontSet(drw->dpy, font->set);
-	else
-		XFreeFont(drw->dpy, font->xfont);
+	if (font->pattern)
+		FcPatternDestroy(font->pattern);
+	XftFontClose(font->dpy, font->xfont);
 	free(font);
 }
 
-Clr *
-drw_clr_create(Drw *drw, const char *clrname) {
-	Clr *clr = (Clr *)calloc(1, sizeof(Clr));
-	Colormap cmap = DefaultColormap(drw->dpy, drw->screen);
-	XColor color;
+Fnt*
+drw_fontset_create(Drw* drw, const char *fonts[], size_t fontcount)
+{
+	Fnt *cur, *ret = NULL;
+	size_t i;
+
+	if (!drw || !fonts)
+		return NULL;
 
-	if(!XAllocNamedColor(drw->dpy, cmap, clrname, &color, &color))
-		die("error, cannot allocate color '%s'\n", clrname);
-	clr->rgb = color.pixel;
-	return clr;
+	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_clr_free(Drw *drw, Clr *clr) {
-	if(!clr)
-		return;
-	free(clr);
+drw_fontset_free(Fnt *font)
+{
+	if (font) {
+		drw_fontset_free(font->next);
+		xfont_free(font);
+	}
 }
 
 void
-drw_setfont(Drw *drw, Fnt *font) {
-	if(!drw)
+drw_clr_create(Drw *drw, Clr *dest, const char *clrname)
+{
+	if (!drw || !dest || !clrname)
 		return;
-	drw->font = font;
+
+	if (!XftColorAllocName(drw->dpy, DefaultVisual(drw->dpy, drw->screen),
+	                       DefaultColormap(drw->dpy, drw->screen),
+	                       clrname, dest))
+		die("error, cannot allocate color '%s'", clrname);
 }
 
-void
-drw_setfg(Drw *drw, Clr *clr) {
-	if(!drw) 
-		return;
-	drw->fg = clr;
+/* 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, 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_setbg(Drw *drw, Clr *clr) {
-	if(!drw)
-		return;
-	drw->bg = clr;
+drw_setfontset(Drw *drw, Fnt *set)
+{
+	if (drw)
+		drw->fonts = set;
 }
 
 void
-drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, Bool filled, Bool empty, Bool invert) {
-	int dx;
-
-	if(!drw || !drw->font || !drw->fg || !drw->bg)
-		return;
-	XSetForeground(drw->dpy, drw->gc, invert ? drw->bg->rgb : drw->fg->rgb);
-	dx = (drw->font->ascent + drw->font->descent + 2) / 4;
-	if(filled)
-		XFillRectangle(drw->dpy, drw->drwable, drw->gc, x+1, y+1, dx+1, dx+1);
-	else if(empty)
-		XDrawRectangle(drw->dpy, drw->drwable, drw->gc, x+1, y+1, dx, dx);
+drw_setscheme(Drw *drw, Clr *scm)
+{
+	if (drw)
+		drw->scheme = scm;
 }
 
 void
-drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, const char *text, Bool invert) {
-	char buf[256];
-	int i, tx, ty, len, olen;
-	Extnts tex;
-
-	if(!drw || !drw->fg || !drw->bg)
-		return;
-	XSetForeground(drw->dpy, drw->gc, invert ? drw->fg->rgb : drw->bg->rgb);
-	XFillRectangle(drw->dpy, drw->drwable, drw->gc, x, y, w, h);
-	if(!text || !drw->font)
-		return;
-	olen = strlen(text);
-	drw_getexts(drw, text, olen, &tex);
-	ty = y + (h / 2) - tex.yOff;
-	tx = x + tex.xOff;
-	/* shorten text if necessary */
-	for(len = MIN(olen, sizeof buf); len && tex.w > w - tex.h; len--)
-		drw_getexts(drw, text, len, &tex);
-	if(!len)
+drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int filled, int invert)
+{
+	if (!drw || !drw->scheme)
 		return;
-	memcpy(buf, text, len);
-	if(len < olen)
-		for(i = len; i && i > len - 3; buf[--i] = '.');
-	XSetForeground(drw->dpy, drw->gc, invert ? drw->bg->rgb : drw->fg->rgb);
-	if(drw->font->set)
-		XmbDrawString(drw->dpy, drw->drwable, drw->font->set, drw->gc, tx, ty, buf, len);
+	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
-		XDrawString(drw->dpy, drw->drwable, drw->gc, tx, ty, buf, len);
+		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)
+{
+	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);
+			FcPatternAddBool(fcpattern, FC_COLOR, FcFalse);
+
+			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);
 }
 
 void
-drw_map(Drw *drw, int x, int y, unsigned int w, unsigned int h) {
-	if(!drw)
+drw_map(Drw *drw, Window win, int x, int y, unsigned int w, unsigned int h)
+{
+	if (!drw)
 		return;
-	XCopyArea(drw->dpy, drw->drwable, drw->win, drw->gc, x, y, w, h, x, y);
+
+	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);
+}
 
 void
-drw_getexts(Drw *drw, const char *text, unsigned int len, Extnts *tex) {
-	XRectangle r;
+drw_font_getexts(Fnt *font, const char *text, unsigned int len, unsigned int *w, unsigned int *h)
+{
+	XGlyphInfo ext;
 
-	if(!drw || !drw->font || !text)
+	if (!font || !text)
 		return;
-	if(drw->font->set) {
-		XmbTextExtents(drw->font->set, text, len, NULL, &r);
-		tex->xOff = r.x;
-		tex->yOff = r.y;
-		tex->w = r.width;
-		tex->h = r.height;
-	}
-	else {
-		tex->h = drw->font->ascent + drw->font->descent;
-		tex->w = XTextWidth(drw->font->xfont, text, len);
-		tex->xOff = tex->h / 2;
-		tex->yOff = (tex->h / 2) + drw->font->ascent;
-	}
+
+	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);
 }