Added ligature-alpha-scrollback (w/o alpha) v0.9 patch

Makefile

@@ -4,7 +4,7 @@
 
 include config.mk
 
-SRC = st.c x.c
+SRC = st.c x.c hb.c
 OBJ = $(SRC:.c=.o)
 
 all: options st
@@ -22,7 +22,8 @@ config.h:
 	$(CC) $(STCFLAGS) -c $<
 
 st.o: config.h st.h win.h
-x.o: arg.h config.h st.h win.h
+x.o: arg.h config.h st.h win.h hb.h
+hb.o: st.h
 
 $(OBJ): config.h config.mk
 

config.def.h

@@ -56,12 +56,6 @@ int allowwindowops = 0;
 static double minlatency = 8;
 static double maxlatency = 33;
 
-/*
- * Synchronized-Update timeout in ms
- * https://gitlab.com/gnachman/iterm2/-/wikis/synchronized-updates-spec
- */
-static uint su_timeout = 200;
-
 /*
  * blinking timeout (set to 0 to disable blinking) for the terminal blinking
  * attribute.
@@ -99,30 +93,35 @@ char *termname = "st-256color";
  */
 unsigned int tabspaces = 8;
 
-/* bg opacity */
-float alpha = 0.8;
-
 /* Terminal colors (16 first used in escape sequence) */
 static const char *colorname[] = {
 	/* 8 normal colors */
-	[0] = "#282828", /* hard contrast: #1d2021 / soft contrast: #32302f */
-	[1] = "#cc241d", /* red     */
-	[2] = "#98971a", /* green   */
-	[3] = "#d79921", /* yellow  */
-	[4] = "#458588", /* blue    */
-	[5] = "#b16286", /* magenta */
-	[6] = "#689d6a", /* cyan    */
-	[7] = "#a89984", /* white   */
+	"black",
+	"red3",
+	"green3",
+	"yellow3",
+	"blue2",
+	"magenta3",
+	"cyan3",
+	"gray90",
 
 	/* 8 bright colors */
-	[8]  = "#928374", /* black   */
-	[9]  = "#fb4934", /* red     */
-	[10] = "#b8bb26", /* green   */
-	[11] = "#fabd2f", /* yellow  */
-	[12] = "#83a598", /* blue    */
-	[13] = "#d3869b", /* magenta */
-	[14] = "#8ec07c", /* cyan    */
-	[15] = "#ebdbb2", /* white   */
+	"gray50",
+	"red",
+	"green",
+	"yellow",
+	"#5c5cff",
+	"magenta",
+	"cyan",
+	"white",
+
+	[255] = 0,
+
+	/* more colors can be added after 255 to use with DefaultXX */
+	"#cccccc",
+	"#555555",
+	"gray90", /* default foreground colour */
+	"black", /* default background colour */
 };
 
 
@@ -130,9 +129,9 @@ static const char *colorname[] = {
  * Default colors (colorname index)
  * foreground, background, cursor, reverse cursor
  */
-unsigned int defaultfg = 15;
-unsigned int defaultbg = 0;
-unsigned int defaultcs = 15;
+unsigned int defaultfg = 258;
+unsigned int defaultbg = 259;
+unsigned int defaultcs = 256;
 static unsigned int defaultrcs = 257;
 
 /*
@@ -202,6 +201,8 @@ static Shortcut shortcuts[] = {
 	{ TERMMOD,              XK_Y,           selpaste,       {.i =  0} },
 	{ ShiftMask,            XK_Insert,      selpaste,       {.i =  0} },
 	{ TERMMOD,              XK_Num_Lock,    numlock,        {.i =  0} },
+	{ ShiftMask,            XK_Page_Up,     kscrollup,      {.i = -1} },
+	{ ShiftMask,            XK_Page_Down,   kscrolldown,    {.i = -1} },
 };
 
 /*

config.mk

@@ -15,10 +15,12 @@ PKG_CONFIG = pkg-config
 # includes and libs
 INCS = -I$(X11INC) \
        `$(PKG_CONFIG) --cflags fontconfig` \
-       `$(PKG_CONFIG) --cflags freetype2`
-LIBS = -L$(X11LIB) -lm -lrt -lX11 -lutil -lXft -lXrender\
+       `$(PKG_CONFIG) --cflags freetype2` \
+       `$(PKG_CONFIG) --cflags harfbuzz`
+LIBS = -L$(X11LIB) -lm -lrt -lX11 -lutil -lXft \
        `$(PKG_CONFIG) --libs fontconfig` \
-       `$(PKG_CONFIG) --libs freetype2`
+       `$(PKG_CONFIG) --libs freetype2` \
+       `$(PKG_CONFIG) --cflags harfbuzz`
 
 # flags
 STCPPFLAGS = -DVERSION=\"$(VERSION)\" -D_XOPEN_SOURCE=600

hb.c

@@ -0,0 +1,124 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <math.h>
+#include <X11/Xft/Xft.h>
+#include <X11/cursorfont.h>
+#include <hb.h>
+#include <hb-ft.h>
+
+#include "st.h"
+#include "hb.h"
+
+#define FEATURE(c1,c2,c3,c4) { .tag = HB_TAG(c1,c2,c3,c4), .value = 1, .start = HB_FEATURE_GLOBAL_START, .end = HB_FEATURE_GLOBAL_END }
+#define BUFFER_STEP 256
+
+hb_font_t *hbfindfont(XftFont *match);
+
+typedef struct {
+	XftFont *match;
+	hb_font_t *font;
+} HbFontMatch;
+
+typedef struct {
+	size_t capacity;
+	HbFontMatch *fonts;
+} HbFontCache;
+
+static HbFontCache hbfontcache = { 0, NULL };
+
+typedef struct {
+	size_t capacity;
+	Rune *runes;
+} RuneBuffer;
+
+static RuneBuffer hbrunebuffer = { 0, NULL };
+
+/*
+ * Poplulate the array with a list of font features, wrapped in FEATURE macro,
+ * e. g.
+ * FEATURE('c', 'a', 'l', 't'), FEATURE('d', 'l', 'i', 'g')
+ */
+hb_feature_t features[] = { };
+
+void
+hbunloadfonts()
+{
+	for (int i = 0; i < hbfontcache.capacity; i++) {
+		hb_font_destroy(hbfontcache.fonts[i].font);
+		XftUnlockFace(hbfontcache.fonts[i].match);
+	}
+
+	if (hbfontcache.fonts != NULL) {
+		free(hbfontcache.fonts);
+		hbfontcache.fonts = NULL;
+	}
+	hbfontcache.capacity = 0;
+}
+
+hb_font_t *
+hbfindfont(XftFont *match)
+{
+	for (int i = 0; i < hbfontcache.capacity; i++) {
+		if (hbfontcache.fonts[i].match == match)
+			return hbfontcache.fonts[i].font;
+	}
+
+	/* Font not found in cache, caching it now. */
+	hbfontcache.fonts = realloc(hbfontcache.fonts, sizeof(HbFontMatch) * (hbfontcache.capacity + 1));
+	FT_Face face = XftLockFace(match);
+	hb_font_t *font = hb_ft_font_create(face, NULL);
+	if (font == NULL)
+		die("Failed to load Harfbuzz font.");
+
+	hbfontcache.fonts[hbfontcache.capacity].match = match;
+	hbfontcache.fonts[hbfontcache.capacity].font = font;
+	hbfontcache.capacity += 1;
+
+	return font;
+}
+
+void hbtransform(HbTransformData *data, XftFont *xfont, const Glyph *glyphs, int start, int length) {
+	ushort mode = USHRT_MAX;
+	unsigned int glyph_count;
+	int rune_idx, glyph_idx, end = start + length;
+
+	hb_font_t *font = hbfindfont(xfont);
+	if (font == NULL)
+		return;
+
+	hb_buffer_t *buffer = hb_buffer_create();
+	hb_buffer_set_direction(buffer, HB_DIRECTION_LTR);
+
+	/* Resize the buffer if required length is larger. */
+	if (hbrunebuffer.capacity < length) {
+		hbrunebuffer.capacity = (length / BUFFER_STEP + 1) * BUFFER_STEP;
+		hbrunebuffer.runes = realloc(hbrunebuffer.runes, hbrunebuffer.capacity * sizeof(Rune));
+	}
+
+	/* Fill buffer with codepoints. */
+	for (rune_idx = 0, glyph_idx = start; glyph_idx < end; glyph_idx++, rune_idx++) {
+		hbrunebuffer.runes[rune_idx] = glyphs[glyph_idx].u;
+		mode = glyphs[glyph_idx].mode;
+		if (mode & ATTR_WDUMMY)
+			hbrunebuffer.runes[rune_idx] = 0x0020;
+	}
+	hb_buffer_add_codepoints(buffer, hbrunebuffer.runes, length, 0, length);
+
+	/* Shape the segment. */
+	hb_shape(font, buffer, features, sizeof(features)/sizeof(hb_feature_t));
+
+	/* Get new glyph info. */
+	hb_glyph_info_t *info = hb_buffer_get_glyph_infos(buffer, &glyph_count);
+	hb_glyph_position_t *pos = hb_buffer_get_glyph_positions(buffer, &glyph_count);
+
+	/* Fill the output. */
+	data->buffer = buffer;
+	data->glyphs = info;
+	data->positions = pos;
+	data->count = glyph_count;
+}
+
+void hbcleanup(HbTransformData *data) {
+	hb_buffer_destroy(data->buffer);
+	memset(data, 0, sizeof(HbTransformData));
+}

hb.h

@@ -0,0 +1,14 @@
+#include <X11/Xft/Xft.h>
+#include <hb.h>
+#include <hb-ft.h>
+
+typedef struct {
+  hb_buffer_t *buffer;
+  hb_glyph_info_t *glyphs;
+  hb_glyph_position_t *positions;
+  unsigned int count;
+} HbTransformData;
+
+void hbunloadfonts();
+void hbtransform(HbTransformData *, XftFont *, const Glyph *, int, int);
+void hbcleanup(HbTransformData *);

st.h

@@ -11,7 +11,8 @@
 #define DIVCEIL(n, d)		(((n) + ((d) - 1)) / (d))
 #define DEFAULT(a, b)		(a) = (a) ? (a) : (b)
 #define LIMIT(x, a, b)		(x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
-#define ATTRCMP(a, b)		((a).mode != (b).mode || (a).fg != (b).fg || \
+#define ATTRCMP(a, b)		(((a).mode & (~ATTR_WRAP)) != ((b).mode & (~ATTR_WRAP)) || \
+				(a).fg != (b).fg || \
 				(a).bg != (b).bg)
 #define TIMEDIFF(t1, t2)	((t1.tv_sec-t2.tv_sec)*1000 + \
 				(t1.tv_nsec-t2.tv_nsec)/1E6)
@@ -22,17 +23,19 @@
 
 enum glyph_attribute {
 	ATTR_NULL       = 0,
-	ATTR_BOLD       = 1 << 0,
-	ATTR_FAINT      = 1 << 1,
-	ATTR_ITALIC     = 1 << 2,
-	ATTR_UNDERLINE  = 1 << 3,
-	ATTR_BLINK      = 1 << 4,
-	ATTR_REVERSE    = 1 << 5,
-	ATTR_INVISIBLE  = 1 << 6,
-	ATTR_STRUCK     = 1 << 7,
-	ATTR_WRAP       = 1 << 8,
-	ATTR_WIDE       = 1 << 9,
-	ATTR_WDUMMY     = 1 << 10,
+	ATTR_SET        = 1 << 0,
+	ATTR_BOLD       = 1 << 1,
+	ATTR_FAINT      = 1 << 2,
+	ATTR_ITALIC     = 1 << 3,
+	ATTR_UNDERLINE  = 1 << 4,
+	ATTR_BLINK      = 1 << 5,
+	ATTR_REVERSE    = 1 << 6,
+	ATTR_INVISIBLE  = 1 << 7,
+	ATTR_STRUCK     = 1 << 8,
+	ATTR_WRAP       = 1 << 9,
+	ATTR_WIDE       = 1 << 10,
+	ATTR_WDUMMY     = 1 << 11,
+	ATTR_SELECTED   = 1 << 12,
 	ATTR_BOLD_FAINT = ATTR_BOLD | ATTR_FAINT,
 };
 
@@ -81,6 +84,8 @@ void die(const char *, ...);
 void redraw(void);
 void draw(void);
 
+void kscrolldown(const Arg *);
+void kscrollup(const Arg *);
 void printscreen(const Arg *);
 void printsel(const Arg *);
 void sendbreak(const Arg *);
@@ -88,6 +93,7 @@ void toggleprinter(const Arg *);
 
 int tattrset(int);
 void tnew(int, int);
+int tisaltscreen(void);
 void tresize(int, int);
 void tsetdirtattr(int);
 void ttyhangup(void);
@@ -124,4 +130,3 @@ extern unsigned int tabspaces;
 extern unsigned int defaultfg;
 extern unsigned int defaultbg;
 extern unsigned int defaultcs;
-extern float alpha;

st.info

@@ -191,7 +191,6 @@ st-mono| simpleterm monocolor,
 	Ms=\E]52;%p1%s;%p2%s\007,
 	Se=\E[2 q,
 	Ss=\E[%p1%d q,
-	Sync=\EP=%p1%ds\E\\,
 
 st| simpleterm,
 	use=st-mono,

win.h

@@ -25,7 +25,7 @@ enum win_mode {
 
 void xbell(void);
 void xclipcopy(void);
-void xdrawcursor(int, int, Glyph, int, int, Glyph);
+void xdrawcursor(int, int, Glyph, int, int, Glyph, Line, int);
 void xdrawline(Line, int, int, int);
 void xfinishdraw(void);
 void xloadcols(void);

x.c

@@ -19,6 +19,7 @@ char *argv0;
 #include "arg.h"
 #include "st.h"
 #include "win.h"
+#include "hb.h"
 
 /* types used in config.h */
 typedef struct {
@@ -81,7 +82,6 @@ typedef XftGlyphFontSpec GlyphFontSpec;
 typedef struct {
 	int tw, th; /* tty width and height */
 	int w, h; /* window width and height */
-	int hborderpx, vborderpx;
 	int ch; /* char height */
 	int cw; /* char width  */
 	int mode; /* window state/mode flags */
@@ -106,7 +106,6 @@ typedef struct {
 	XSetWindowAttributes attrs;
 	int scr;
 	int isfixed; /* is fixed geometry? */
-	int depth; /* bit depth */
 	int l, t; /* left and top offset */
 	int gm; /* geometry mask */
 } XWindow;
@@ -143,6 +142,7 @@ typedef struct {
 } DC;
 
 static inline ushort sixd_to_16bit(int);
+static void xresetfontsettings(ushort mode, Font **font, int *frcflags);
 static int xmakeglyphfontspecs(XftGlyphFontSpec *, const Glyph *, int, int, int);
 static void xdrawglyphfontspecs(const XftGlyphFontSpec *, Glyph, int, int, int);
 static void xdrawglyph(Glyph, int, int);
@@ -245,7 +245,6 @@ static char *usedfont = NULL;
 static double usedfontsize = 0;
 static double defaultfontsize = 0;
 
-static char *opt_alpha = NULL;
 static char *opt_class = NULL;
 static char **opt_cmd  = NULL;
 static char *opt_embed = NULL;
@@ -334,7 +333,7 @@ ttysend(const Arg *arg)
 int
 evcol(XEvent *e)
 {
-	int x = e->xbutton.x - win.hborderpx;
+	int x = e->xbutton.x - borderpx;
 	LIMIT(x, 0, win.tw - 1);
 	return x / win.cw;
 }
@@ -342,7 +341,7 @@ evcol(XEvent *e)
 int
 evrow(XEvent *e)
 {
-	int y = e->xbutton.y - win.vborderpx;
+	int y = e->xbutton.y - borderpx;
 	LIMIT(y, 0, win.th - 1);
 	return y / win.ch;
 }
@@ -689,8 +688,6 @@ setsel(char *str, Time t)
 	XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, t);
 	if (XGetSelectionOwner(xw.dpy, XA_PRIMARY) != xw.win)
 		selclear();
-
-	xclipcopy();
 }
 
 void
@@ -714,9 +711,7 @@ brelease(XEvent *e)
 
 	if (mouseaction(e, 1))
 		return;
-	if (btn == Button3)
-		selpaste(NULL);
-	else if (btn == Button1)
+	if (btn == Button1)
 		mousesel(e, 1);
 }
 
@@ -746,9 +741,6 @@ cresize(int width, int height)
 	col = MAX(1, col);
 	row = MAX(1, row);
 
-	win.hborderpx = (win.w - col * win.cw) / 2;
-	win.vborderpx = (win.h - row * win.ch) / 2;
-
 	tresize(col, row);
 	xresize(col, row);
 	ttyresize(win.tw, win.th);
@@ -762,12 +754,12 @@ xresize(int col, int row)
 
 	XFreePixmap(xw.dpy, xw.buf);
 	xw.buf = XCreatePixmap(xw.dpy, xw.win, win.w, win.h,
-			xw.depth);
+			DefaultDepth(xw.dpy, xw.scr));
 	XftDrawChange(xw.draw, xw.buf);
 	xclear(0, 0, win.w, win.h);
 
 	/* resize to new width */
-	xw.specbuf = xrealloc(xw.specbuf, col * sizeof(GlyphFontSpec));
+	xw.specbuf = xrealloc(xw.specbuf, col * sizeof(GlyphFontSpec) * 4);
 }
 
 ushort
@@ -822,13 +814,6 @@ xloadcols(void)
 			else
 				die("could not allocate color %d\n", i);
 		}
-
-	/* set alpha value of bg color */
-	if (opt_alpha)
-		alpha = strtof(opt_alpha, NULL);
-	dc.col[defaultbg].color.alpha = (unsigned short)(0xffff * alpha);
-	dc.col[defaultbg].pixel &= 0x00FFFFFF;
-	dc.col[defaultbg].pixel |= (unsigned char)(0xff * alpha) << 24;
 	loaded = 1;
 }
 
@@ -886,8 +871,8 @@ xhints(void)
 	sizeh->flags = PSize | PResizeInc | PBaseSize | PMinSize;
 	sizeh->height = win.h;
 	sizeh->width = win.w;
-	sizeh->height_inc = 1;
-	sizeh->width_inc = 1;
+	sizeh->height_inc = win.ch;
+	sizeh->width_inc = win.cw;
 	sizeh->base_height = 2 * borderpx;
 	sizeh->base_width = 2 * borderpx;
 	sizeh->min_height = win.ch + 2 * borderpx;
@@ -1079,6 +1064,9 @@ xunloadfont(Font *f)
 void
 xunloadfonts(void)
 {
+	/* Clear Harfbuzz font cache. */
+	hbunloadfonts();
+
 	/* Free the loaded fonts in the font cache.  */
 	while (frclen > 0)
 		XftFontClose(xw.dpy, frc[--frclen].font);
@@ -1151,23 +1139,11 @@ xinit(int cols, int rows)
 	Window parent;
 	pid_t thispid = getpid();
 	XColor xmousefg, xmousebg;
-	XWindowAttributes attr;
-	XVisualInfo vis;
 
 	if (!(xw.dpy = XOpenDisplay(NULL)))
 		die("can't open display\n");
 	xw.scr = XDefaultScreen(xw.dpy);
-
-	if (!(opt_embed && (parent = strtol(opt_embed, NULL, 0)))) {
-		parent = XRootWindow(xw.dpy, xw.scr);
-		xw.depth = 32;
-	} else {
-		XGetWindowAttributes(xw.dpy, parent, &attr);
-		xw.depth = attr.depth;
-	}
-
-	XMatchVisualInfo(xw.dpy, xw.scr, xw.depth, TrueColor, &vis);
-	xw.vis = vis.visual;
+	xw.vis = XDefaultVisual(xw.dpy, xw.scr);
 
 	/* font */
 	if (!FcInit())
@@ -1177,12 +1153,12 @@ xinit(int cols, int rows)
 	xloadfonts(usedfont, 0);
 
 	/* colors */
-	xw.cmap = XCreateColormap(xw.dpy, parent, xw.vis, None);
+	xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
 	xloadcols();
 
 	/* adjust fixed window geometry */
-	win.w = 2 * win.hborderpx + 2 * borderpx + cols * win.cw;
-	win.h = 2 * win.vborderpx + 2 * borderpx + rows * win.ch;
+	win.w = 2 * borderpx + cols * win.cw;
+	win.h = 2 * borderpx + rows * win.ch;
 	if (xw.gm & XNegative)
 		xw.l += DisplayWidth(xw.dpy, xw.scr) - win.w - 2;
 	if (xw.gm & YNegative)
@@ -1197,20 +1173,24 @@ xinit(int cols, int rows)
 		| ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
 	xw.attrs.colormap = xw.cmap;
 
+	if (!(opt_embed && (parent = strtol(opt_embed, NULL, 0))))
+		parent = XRootWindow(xw.dpy, xw.scr);
 	xw.win = XCreateWindow(xw.dpy, parent, xw.l, xw.t,
-			win.w, win.h, 0, xw.depth, InputOutput,
+			win.w, win.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
 			xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity
 			| CWEventMask | CWColormap, &xw.attrs);
 
 	memset(&gcvalues, 0, sizeof(gcvalues));
 	gcvalues.graphics_exposures = False;
-	xw.buf = XCreatePixmap(xw.dpy, xw.win, win.w, win.h, xw.depth);
-	dc.gc = XCreateGC(xw.dpy, xw.buf, GCGraphicsExposures, &gcvalues);
+	dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
+			&gcvalues);
+	xw.buf = XCreatePixmap(xw.dpy, xw.win, win.w, win.h,
+			DefaultDepth(xw.dpy, xw.scr));
 	XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
 	XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, win.w, win.h);
 
 	/* font spec buffer */
-	xw.specbuf = xmalloc(cols * sizeof(GlyphFontSpec));
+	xw.specbuf = xmalloc(cols * sizeof(GlyphFontSpec) * 4);
 
 	/* Xft rendering context */
 	xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
@@ -1264,10 +1244,26 @@ xinit(int cols, int rows)
 		xsel.xtarget = XA_STRING;
 }
 
+void
+xresetfontsettings(ushort mode, Font **font, int *frcflags)
+{
+	*font = &dc.font;
+	if ((mode & ATTR_ITALIC) && (mode & ATTR_BOLD)) {
+		*font = &dc.ibfont;
+		*frcflags = FRC_ITALICBOLD;
+	} else if (mode & ATTR_ITALIC) {
+		*font = &dc.ifont;
+		*frcflags = FRC_ITALIC;
+	} else if (mode & ATTR_BOLD) {
+		*font = &dc.bfont;
+		*frcflags = FRC_BOLD;
+	}
+}
+
 int
 xmakeglyphfontspecs(XftGlyphFontSpec *specs, const Glyph *glyphs, int len, int x, int y)
 {
-	float winx = win.hborderpx + x * win.cw, winy = win.vborderpx + y * win.ch, xp, yp;
+	float winx = borderpx + x * win.cw, winy = borderpx + y * win.ch, xp, yp;
 	ushort mode, prevmode = USHRT_MAX;
 	Font *font = &dc.font;
 	int frcflags = FRC_NORMAL;
@@ -1278,119 +1274,148 @@ xmakeglyphfontspecs(XftGlyphFontSpec *specs, const Glyph *glyphs, int len, int x
 	FcPattern *fcpattern, *fontpattern;
 	FcFontSet *fcsets[] = { NULL };
 	FcCharSet *fccharset;
-	int i, f, numspecs = 0;
+	int i, f, length = 0, start = 0, numspecs = 0;
+  float cluster_xp = xp, cluster_yp = yp;
+	HbTransformData shaped = { 0 };
+
+	/* Initial values. */
+	mode = prevmode = glyphs[0].mode;
+	xresetfontsettings(mode, &font, &frcflags);
 
 	for (i = 0, xp = winx, yp = winy + font->ascent; i < len; ++i) {
-		/* Fetch rune and mode for current glyph. */
-		rune = glyphs[i].u;
 		mode = glyphs[i].mode;
 
 		/* Skip dummy wide-character spacing. */
-		if (mode == ATTR_WDUMMY)
+		if (mode & ATTR_WDUMMY && i < (len - 1))
 			continue;
 
-		/* Determine font for glyph if different from previous glyph. */
-		if (prevmode != mode) {
-			prevmode = mode;
-			font = &dc.font;
-			frcflags = FRC_NORMAL;
-			runewidth = win.cw * ((mode & ATTR_WIDE) ? 2.0f : 1.0f);
-			if ((mode & ATTR_ITALIC) && (mode & ATTR_BOLD)) {
-				font = &dc.ibfont;
-				frcflags = FRC_ITALICBOLD;
-			} else if (mode & ATTR_ITALIC) {
-				font = &dc.ifont;
-				frcflags = FRC_ITALIC;
-			} else if (mode & ATTR_BOLD) {
-				font = &dc.bfont;
-				frcflags = FRC_BOLD;
-			}
-			yp = winy + font->ascent;
-		}
-
-		/* Lookup character index with default font. */
-		glyphidx = XftCharIndex(xw.dpy, font->match, rune);
-		if (glyphidx) {
-			specs[numspecs].font = font->match;
-			specs[numspecs].glyph = glyphidx;
-			specs[numspecs].x = (short)xp;
-			specs[numspecs].y = (short)yp;
-			xp += runewidth;
-			numspecs++;
-			continue;
-		}
-
-		/* Fallback on font cache, search the font cache for match. */
-		for (f = 0; f < frclen; f++) {
-			glyphidx = XftCharIndex(xw.dpy, frc[f].font, rune);
-			/* Everything correct. */
-			if (glyphidx && frc[f].flags == frcflags)
-				break;
-			/* We got a default font for a not found glyph. */
-			if (!glyphidx && frc[f].flags == frcflags
-					&& frc[f].unicodep == rune) {
-				break;
-			}
-		}
-
-		/* Nothing was found. Use fontconfig to find matching font. */
-		if (f >= frclen) {
-			if (!font->set)
-				font->set = FcFontSort(0, font->pattern,
-				                       1, 0, &fcres);
-			fcsets[0] = font->set;
-
-			/*
-			 * Nothing was found in the cache. Now use
-			 * some dozen of Fontconfig calls to get the
-			 * font for one single character.
-			 *
-			 * Xft and fontconfig are design failures.
-			 */
-			fcpattern = FcPatternDuplicate(font->pattern);
-			fccharset = FcCharSetCreate();
-
-			FcCharSetAddChar(fccharset, rune);
-			FcPatternAddCharSet(fcpattern, FC_CHARSET,
-					fccharset);
-			FcPatternAddBool(fcpattern, FC_SCALABLE, 1);
-
-			FcConfigSubstitute(0, fcpattern,
-					FcMatchPattern);
-			FcDefaultSubstitute(fcpattern);
-
-			fontpattern = FcFontSetMatch(0, fcsets, 1,
-					fcpattern, &fcres);
-
-			/* Allocate memory for the new cache entry. */
-			if (frclen >= frccap) {
-				frccap += 16;
-				frc = xrealloc(frc, frccap * sizeof(Fontcache));
+		if (
+			prevmode != mode
+			|| ATTRCMP(glyphs[start], glyphs[i])
+			|| selected(x + i, y) != selected(x + start, y)
+			|| i == (len - 1)
+		) {
+			/* Handle 1-character wide segments and end of line */
+			length = i - start;
+			if (i == start) {
+				length = 1;
+			} else if (i == (len - 1)) {
+				length = (i - start + 1);
 			}
 
-			frc[frclen].font = XftFontOpenPattern(xw.dpy,
-					fontpattern);
-			if (!frc[frclen].font)
-				die("XftFontOpenPattern failed seeking fallback font: %s\n",
-					strerror(errno));
-			frc[frclen].flags = frcflags;
-			frc[frclen].unicodep = rune;
+			/* Shape the segment. */
+			hbtransform(&shaped, font->match, glyphs, start, length);
+			runewidth = win.cw * ((glyphs[start].mode & ATTR_WIDE) ? 2.0f : 1.0f);
+			cluster_xp = xp; cluster_yp = yp;
+			for (int code_idx = 0; code_idx < shaped.count; code_idx++) {
+				int idx = shaped.glyphs[code_idx].cluster;
 
-			glyphidx = XftCharIndex(xw.dpy, frc[frclen].font, rune);
+				if (glyphs[start + idx].mode & ATTR_WDUMMY)
+					continue;
 
-			f = frclen;
-			frclen++;
+				/* Advance the drawing cursor if we've moved to a new cluster */
+				if (code_idx > 0 && idx != shaped.glyphs[code_idx - 1].cluster) {
+					xp += runewidth;
+					cluster_xp = xp;
+					cluster_yp = yp;
+					runewidth = win.cw * ((glyphs[start + idx].mode & ATTR_WIDE) ? 2.0f : 1.0f);
+				}
 
-			FcPatternDestroy(fcpattern);
-			FcCharSetDestroy(fccharset);
+				if (shaped.glyphs[code_idx].codepoint != 0) {
+					/* If symbol is found, put it into the specs. */
+					specs[numspecs].font = font->match;
+					specs[numspecs].glyph = shaped.glyphs[code_idx].codepoint;
+					specs[numspecs].x = cluster_xp + (short)(shaped.positions[code_idx].x_offset / 64.);
+					specs[numspecs].y = cluster_yp - (short)(shaped.positions[code_idx].y_offset / 64.);
+					cluster_xp += shaped.positions[code_idx].x_advance / 64.;
+					cluster_yp += shaped.positions[code_idx].y_advance / 64.;
+					numspecs++;
+				} else {
+					/* If it's not found, try to fetch it through the font cache. */
+					rune = glyphs[start + idx].u;
+					for (f = 0; f < frclen; f++) {
+						glyphidx = XftCharIndex(xw.dpy, frc[f].font, rune);
+						/* Everything correct. */
+						if (glyphidx && frc[f].flags == frcflags)
+							break;
+						/* We got a default font for a not found glyph. */
+						if (!glyphidx && frc[f].flags == frcflags
+								&& frc[f].unicodep == rune) {
+							break;
+						}
+					}
+
+					/* Nothing was found. Use fontconfig to find matching font. */
+					if (f >= frclen) {
+						if (!font->set)
+							font->set = FcFontSort(0, font->pattern,
+																		 1, 0, &fcres);
+						fcsets[0] = font->set;
+
+						/*
+						 * Nothing was found in the cache. Now use
+						 * some dozen of Fontconfig calls to get the
+						 * font for one single character.
+						 *
+						 * Xft and fontconfig are design failures.
+						 */
+						fcpattern = FcPatternDuplicate(font->pattern);
+						fccharset = FcCharSetCreate();
+
+						FcCharSetAddChar(fccharset, rune);
+						FcPatternAddCharSet(fcpattern, FC_CHARSET,
+								fccharset);
+						FcPatternAddBool(fcpattern, FC_SCALABLE, 1);
+
+						FcConfigSubstitute(0, fcpattern,
+								FcMatchPattern);
+						FcDefaultSubstitute(fcpattern);
+
+						fontpattern = FcFontSetMatch(0, fcsets, 1,
+								fcpattern, &fcres);
+
+						/* Allocate memory for the new cache entry. */
+						if (frclen >= frccap) {
+							frccap += 16;
+							frc = xrealloc(frc, frccap * sizeof(Fontcache));
+						}
+
+						frc[frclen].font = XftFontOpenPattern(xw.dpy,
+								fontpattern);
+						if (!frc[frclen].font)
+							die("XftFontOpenPattern failed seeking fallback font: %s\n",
+								strerror(errno));
+						frc[frclen].flags = frcflags;
+						frc[frclen].unicodep = rune;
+
+						glyphidx = XftCharIndex(xw.dpy, frc[frclen].font, rune);
+
+						f = frclen;
+						frclen++;
+
+						FcPatternDestroy(fcpattern);
+						FcCharSetDestroy(fccharset);
+					}
+
+					specs[numspecs].font = frc[f].font;
+					specs[numspecs].glyph = glyphidx;
+					specs[numspecs].x = (short)xp;
+					specs[numspecs].y = (short)yp;
+					numspecs++;
+				}
+			}
+
+			/* Cleanup and get ready for next segment. */
+			hbcleanup(&shaped);
+			start = i;
+
+			/* Determine font for glyph if different from previous glyph. */
+			if (prevmode != mode) {
+				prevmode = mode;
+				xresetfontsettings(mode, &font, &frcflags);
+				yp = winy + font->ascent;
+			}
 		}
-
-		specs[numspecs].font = frc[f].font;
-		specs[numspecs].glyph = glyphidx;
-		specs[numspecs].x = (short)xp;
-		specs[numspecs].y = (short)yp;
-		xp += runewidth;
-		numspecs++;
 	}
 
 	return numspecs;
@@ -1400,7 +1425,7 @@ void
 xdrawglyphfontspecs(const XftGlyphFontSpec *specs, Glyph base, int len, int x, int y)
 {
 	int charlen = len * ((base.mode & ATTR_WIDE) ? 2 : 1);
-	int winx = win.hborderpx + x * win.cw, winy = win.vborderpx + y * win.ch,
+	int winx = borderpx + x * win.cw, winy = borderpx + y * win.ch,
 	    width = charlen * win.cw;
 	Color *fg, *bg, *temp, revfg, revbg, truefg, truebg;
 	XRenderColor colfg, colbg;
@@ -1437,6 +1462,10 @@ xdrawglyphfontspecs(const XftGlyphFontSpec *specs, Glyph base, int len, int x, i
 		bg = &dc.col[base.bg];
 	}
 
+	/* Change basic system colors [0-7] to bright system colors [8-15] */
+	if ((base.mode & ATTR_BOLD_FAINT) == ATTR_BOLD && BETWEEN(base.fg, 0, 7))
+		fg = &dc.col[base.fg + 8];
+
 	if (IS_SET(MODE_REVERSE)) {
 		if (fg == &dc.col[defaultfg]) {
 			fg = &dc.col[defaultbg];
@@ -1486,17 +1515,17 @@ xdrawglyphfontspecs(const XftGlyphFontSpec *specs, Glyph base, int len, int x, i
 
 	/* Intelligent cleaning up of the borders. */
 	if (x == 0) {
-		xclear(0, (y == 0)? 0 : winy, win.hborderpx,
+		xclear(0, (y == 0)? 0 : winy, borderpx,
 			winy + win.ch +
-			((winy + win.ch >= win.vborderpx + win.th)? win.h : 0));
+			((winy + win.ch >= borderpx + win.th)? win.h : 0));
 	}
-	if (winx + width >= win.hborderpx + win.tw) {
+	if (winx + width >= borderpx + win.tw) {
 		xclear(winx + width, (y == 0)? 0 : winy, win.w,
-			((winy + win.ch >= win.vborderpx + win.th)? win.h : (winy + win.ch)));
+			((winy + win.ch >= borderpx + win.th)? win.h : (winy + win.ch)));
 	}
 	if (y == 0)
-		xclear(winx, 0, winx + width, win.vborderpx);
-	if (winy + win.ch >= win.vborderpx + win.th)
+		xclear(winx, 0, winx + width, borderpx);
+	if (winy + win.ch >= borderpx + win.th)
 		xclear(winx, winy + win.ch, winx + width, win.h);
 
 	/* Clean up the region we want to draw to. */
@@ -1538,15 +1567,17 @@ xdrawglyph(Glyph g, int x, int y)
 }
 
 void
-xdrawcursor(int cx, int cy, Glyph g, int ox, int oy, Glyph og)
+xdrawcursor(int cx, int cy, Glyph g, int ox, int oy, Glyph og, Line line, int len)
 {
 	Color drawcol;
-	XRenderColor colbg;
 
 	/* remove the old cursor */
 	if (selected(ox, oy))
 		og.mode ^= ATTR_REVERSE;
-	xdrawglyph(og, ox, oy);
+
+	/* Redraw the line where cursor was previously.
+	 * It will restore the ligatures broken by the cursor. */
+	xdrawline(line, 0, oy, len);
 
 	if (IS_SET(MODE_HIDE))
 		return;
@@ -1570,21 +1601,11 @@ xdrawcursor(int cx, int cy, Glyph g, int ox, int oy, Glyph og)
 		if (selected(cx, cy)) {
 			g.fg = defaultfg;
 			g.bg = defaultrcs;
-		} else if (!(og.mode & ATTR_REVERSE)) {
-			unsigned long col = g.bg;
-			g.bg = g.fg;
-			g.fg = col;
-		}
-
-		if (IS_TRUECOL(g.bg)) {
-			colbg.alpha = 0xffff;
-			colbg.red = TRUERED(g.bg);
-			colbg.green = TRUEGREEN(g.bg);
-			colbg.blue = TRUEBLUE(g.bg);
-			XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &drawcol);
 		} else {
-			drawcol = dc.col[g.bg];
+			g.fg = defaultbg;
+			g.bg = defaultcs;
 		}
+		drawcol = dc.col[g.bg];
 	}
 
 	/* draw the new one */
@@ -1601,35 +1622,35 @@ xdrawcursor(int cx, int cy, Glyph g, int ox, int oy, Glyph og)
 		case 3: /* Blinking Underline */
 		case 4: /* Steady Underline */
 			XftDrawRect(xw.draw, &drawcol,
-					win.hborderpx + cx * win.cw,
-					win.vborderpx + (cy + 1) * win.ch - \
+					borderpx + cx * win.cw,
+					borderpx + (cy + 1) * win.ch - \
 						cursorthickness,
 					win.cw, cursorthickness);
 			break;
 		case 5: /* Blinking bar */
 		case 6: /* Steady bar */
 			XftDrawRect(xw.draw, &drawcol,
-					win.hborderpx + cx * win.cw,
-					win.vborderpx + cy * win.ch,
+					borderpx + cx * win.cw,
+					borderpx + cy * win.ch,
 					cursorthickness, win.ch);
 			break;
 		}
 	} else {
 		XftDrawRect(xw.draw, &drawcol,
-				win.hborderpx + cx * win.cw,
-				win.vborderpx + cy * win.ch,
+				borderpx + cx * win.cw,
+				borderpx + cy * win.ch,
 				win.cw - 1, 1);
 		XftDrawRect(xw.draw, &drawcol,
-				win.hborderpx + cx * win.cw,
-				win.vborderpx + cy * win.ch,
+				borderpx + cx * win.cw,
+				borderpx + cy * win.ch,
 				1, win.ch - 1);
 		XftDrawRect(xw.draw, &drawcol,
-				win.hborderpx + (cx + 1) * win.cw - 1,
-				win.vborderpx + cy * win.ch,
+				borderpx + (cx + 1) * win.cw - 1,
+				borderpx + cy * win.ch,
 				1, win.ch - 1);
 		XftDrawRect(xw.draw, &drawcol,
-				win.hborderpx + cx * win.cw,
-				win.vborderpx + (cy + 1) * win.ch - 1,
+				borderpx + cx * win.cw,
+				borderpx + (cy + 1) * win.ch - 1,
 				win.cw, 1);
 	}
 }
@@ -1684,18 +1705,16 @@ xdrawline(Line line, int x1, int y1, int x2)
 	Glyph base, new;
 	XftGlyphFontSpec *specs = xw.specbuf;
 
-	numspecs = xmakeglyphfontspecs(specs, &line[x1], x2 - x1, x1, y1);
 	i = ox = 0;
-	for (x = x1; x < x2 && i < numspecs; x++) {
+	for (x = x1; x < x2; x++) {
 		new = line[x];
 		if (new.mode == ATTR_WDUMMY)
 			continue;
 		if (selected(x, y1))
 			new.mode ^= ATTR_REVERSE;
-		if (i > 0 && ATTRCMP(base, new)) {
-			xdrawglyphfontspecs(specs, base, i, ox, y1);
-			specs += i;
-			numspecs -= i;
+		if ((i > 0) && ATTRCMP(base, new)) {
+			numspecs = xmakeglyphfontspecs(specs, &line[ox], x - ox, ox, y1);
+			xdrawglyphfontspecs(specs, base, numspecs, ox, y1);
 			i = 0;
 		}
 		if (i == 0) {
@@ -1704,8 +1723,10 @@ xdrawline(Line line, int x1, int y1, int x2)
 		}
 		i++;
 	}
-	if (i > 0)
-		xdrawglyphfontspecs(specs, base, i, ox, y1);
+	if (i > 0) {
+		numspecs = xmakeglyphfontspecs(specs, &line[ox], x2 - ox, ox, y1);
+		xdrawglyphfontspecs(specs, base, numspecs, ox, y1);
+	}
 }
 
 void
@@ -1943,9 +1964,6 @@ resize(XEvent *e)
 	cresize(e->xconfigure.width, e->xconfigure.height);
 }
 
-int tinsync(uint);
-int ttyread_pending();
-
 void
 run(void)
 {
@@ -1980,7 +1998,7 @@ run(void)
 		FD_SET(ttyfd, &rfd);
 		FD_SET(xfd, &rfd);
 
-		if (XPending(xw.dpy) || ttyread_pending())
+		if (XPending(xw.dpy))
 			timeout = 0;  /* existing events might not set xfd */
 
 		seltv.tv_sec = timeout / 1E3;
@@ -1994,8 +2012,7 @@ run(void)
 		}
 		clock_gettime(CLOCK_MONOTONIC, &now);
 
-		int ttyin = FD_ISSET(ttyfd, &rfd) || ttyread_pending();
-		if (ttyin)
+		if (FD_ISSET(ttyfd, &rfd))
 			ttyread();
 
 		xev = 0;
@@ -2019,7 +2036,7 @@ run(void)
 		 * maximum latency intervals during `cat huge.txt`, and perfect
 		 * sync with periodic updates from animations/key-repeats/etc.
 		 */
-		if (ttyin || xev) {
+		if (FD_ISSET(ttyfd, &rfd) || xev) {
 			if (!drawing) {
 				trigger = now;
 				drawing = 1;
@@ -2030,18 +2047,6 @@ run(void)
 				continue;  /* we have time, try to find idle */
 		}
 
-		if (tinsync(su_timeout)) {
-			/*
-			 * on synchronized-update draw-suspension: don't reset
-			 * drawing so that we draw ASAP once we can (just after
-			 * ESU). it won't be too soon because we already can
-			 * draw now but we skip. we set timeout > 0 to draw on
-			 * SU-timeout even without new content.
-			 */
-			timeout = minlatency;
-			continue;
-		}
-
 		/* idle detected or maxlatency exhausted -> draw */
 		timeout = -1;
 		if (blinktimeout && tattrset(ATTR_BLINK)) {
@@ -2086,9 +2091,6 @@ main(int argc, char *argv[])
 	case 'a':
 		allowaltscreen = 0;
 		break;
-	case 'A':
-		opt_alpha = EARGF(usage());
-		break;
 	case 'c':
 		opt_class = EARGF(usage());
 		break;