From 08d3749a636f9cd51f70ba1eed043be8e6c2eca9 Mon Sep 17 00:00:00 2001
From: Nicholas Noll <nbnoll@eml.cc>
Date: Tue, 5 Oct 2021 16:57:55 -0700
Subject: feat(term): added ligature support. some combining character help

---
 sys/cmd/term/x.c | 36 ++++++++++++++++++++++--------------
 1 file changed, 22 insertions(+), 14 deletions(-)

(limited to 'sys/cmd/term/x.c')

diff --git a/sys/cmd/term/x.c b/sys/cmd/term/x.c
index 308478f..3079f38 100644
--- a/sys/cmd/term/x.c
+++ b/sys/cmd/term/x.c
@@ -11,6 +11,10 @@
 #include <X11/Xft/Xft.h>
 #include <X11/XKBlib.h>
 
+/* harfbuzz additions */
+void hbunloadfonts();
+void hbtransform(XftGlyphFontSpec *, const Letter*, size_t, int, int);
+
 /* types used in config.h */
 typedef struct Shortcut      Shortcut;
 typedef struct MouseShortcut MouseShortcut;
@@ -1021,6 +1025,8 @@ xunloadfont(Font *f)
 void
 xunloadfonts(void)
 {
+    hbunloadfonts();
+
 	/* Free the loaded fonts in the font cache.  */
 	while (frclen > 0)
 		XftFontClose(xw.dpy, frc[--frclen].font);
@@ -1223,17 +1229,17 @@ xmakeglyphfontspecs(XftGlyphFontSpec *specs, Letter *glyphs, int len, int x, int
 	FcCharSet *fccharset;
 	int i, f, numspecs = 0;
 
-	for (i = 0, xp = winx, yp = winy + font->ascent; i < len; ++i) {
+	for(i = 0, xp = winx, yp = winy + font->ascent; i < len; ++i) {
 		/* Fetch rune and mode for current glyph. */
 		r = glyphs[i].u;
 		mode = glyphs[i].mode;
 
 		/* Skip dummy wide-character spacing. */
-		if (mode == Gwdummy)
+		if(mode & Gwdummy)
 			continue;
 
 		/* Determine font for glyph if different from previous glyph. */
-		if (prevmode != mode) {
+		if(prevmode != mode) {
 			prevmode = mode;
 			font = &dc.font;
 			frcflags = FRC_NORMAL;
@@ -1251,9 +1257,9 @@ xmakeglyphfontspecs(XftGlyphFontSpec *specs, Letter *glyphs, int len, int x, int
 			yp = winy + font->ascent;
 		}
 
-		/* Lookup character index with default font. */
+		/* lookup character index with default font. */
 		glyphidx = XftCharIndex(xw.dpy, font->match, r);
-		if (glyphidx) {
+		if(glyphidx) {
 			specs[numspecs].font  = font->match;
 			specs[numspecs].glyph = glyphidx;
 			specs[numspecs].x     = (short)xp;
@@ -1264,7 +1270,7 @@ xmakeglyphfontspecs(XftGlyphFontSpec *specs, Letter *glyphs, int len, int x, int
 		}
 
 		/* Fallback on font cache, search the font cache for match. */
-		for (f = 0; f < frclen; f++) {
+		for(f = 0; f < frclen; f++) {
 			glyphidx = XftCharIndex(xw.dpy, frc[f].font, r);
 			/* Everything correct. */
 			if (glyphidx && frc[f].flags == frcflags)
@@ -1277,7 +1283,7 @@ xmakeglyphfontspecs(XftGlyphFontSpec *specs, Letter *glyphs, int len, int x, int
 		}
 
 		/* Nothing was found. Use fontconfig to find matching font. */
-		if (f >= frclen) {
+		if(f >= frclen) {
 			if (!font->set)
 				font->set = FcFontSort(0, font->pattern,
 				                       1, 0, &fcres);
@@ -1336,6 +1342,8 @@ xmakeglyphfontspecs(XftGlyphFontSpec *specs, Letter *glyphs, int len, int x, int
 		numspecs++;
 	}
 
+    hbtransform(specs, glyphs, len, x, y);
+
 	return numspecs;
 }
 
@@ -1474,16 +1482,16 @@ xdrawglyph(Letter g, int x, int y)
 }
 
 void
-xdrawcursor(int cx, int cy, Letter g, int ox, int oy, Letter og)
+xdrawcursor(int cx, int cy, Letter g, int ox, int oy, Letter og, Letter *line, int len)
 {
 	Color drawcol;
 
 	/* remove the old cursor */
-	if (selected(ox, oy))
+	if(selected(ox, oy))
 		og.mode ^= Greverse;
-	xdrawglyph(og, ox, oy);
+	xdrawline(line, 0, oy, len);
 
-	if (IS_SET(Whide))
+	if(IS_SET(Whide))
 		return;
 
 	/*
@@ -1491,7 +1499,7 @@ xdrawcursor(int cx, int cy, Letter g, int ox, int oy, Letter og)
 	 */
 	g.mode &= Gbold|Gitalic|Gunline|Gstruck|Gwide;
 
-	if (IS_SET(Wreverse)) {
+	if(IS_SET(Wreverse)) {
 		g.mode |= Greverse;
 		g.bg    = defaultfg;
 		if (selected(cx, cy)) {
@@ -1502,7 +1510,7 @@ xdrawcursor(int cx, int cy, Letter g, int ox, int oy, Letter og)
 			g.fg = defaultcs;
 		}
 	} else {
-		if (selected(cx, cy)) {
+		if(selected(cx, cy)) {
 			g.fg = defaultfg;
 			g.bg = defaultrcs;
 		} else {
@@ -1520,7 +1528,7 @@ xdrawcursor(int cx, int cy, Letter g, int ox, int oy, Letter og)
 	}
 
 drawnew:
-	if (IS_SET(Wfocused)) {
+	if(IS_SET(Wfocused)) {
 		switch (win.cursor) {
 		case 7: /* st extension */
 			g.u = 0x2603; /* snowman (U+2603) */
-- 
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