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st-ligatures-alpha-scrollback-20200428-28ad288.diff (7908B)

---

 diff --git a/Makefile b/Makefile
 index 470ac86..38240da 100644
 --- a/Makefile
 +++ b/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
  
 diff --git a/config.mk b/config.mk
 index 1d2f0e2..fd92921 100644
 --- a/config.mk
 +++ b/config.mk
 @@ -15,10 +15,12 @@ PKG_CONFIG = pkg-config
  # includes and libs
  INCS = -I$(X11INC) \
         `$(PKG_CONFIG) --cflags fontconfig` \
 -       `$(PKG_CONFIG) --cflags freetype2`
 +       `$(PKG_CONFIG) --cflags freetype2` \
 +       `$(PKG_CONFIG) --cflags harfbuzz`
  LIBS = -L$(X11LIB) -lm -lrt -lX11 -lutil -lXft -lXrender\
         `$(PKG_CONFIG) --libs fontconfig` \
 -       `$(PKG_CONFIG) --libs freetype2`
 +       `$(PKG_CONFIG) --libs freetype2` \
 +       `$(PKG_CONFIG) --libs harfbuzz`
  
  # flags
  STCPPFLAGS = -DVERSION=\"$(VERSION)\" -D_XOPEN_SOURCE=600
 diff --git a/hb.c b/hb.c
 new file mode 100644
 index 0000000..bd3fb71
 --- /dev/null
 +++ b/hb.c
 @@ -0,0 +1,136 @@
 +#include <stdlib.h>
 +#include <stdio.h>
 +#include <math.h>
 +#include <X11/Xft/Xft.h>
 +#include <hb.h>
 +#include <hb-ft.h>
 +
 +#include "st.h"
 +
 +void hbtransformsegment(XftFont *xfont, const Glyph *string, hb_codepoint_t *codepoints, int start, int length);
 +hb_font_t *hbfindfont(XftFont *match);
 +
 +typedef struct {
 +	XftFont *match;
 +	hb_font_t *font;
 +} HbFontMatch;
 +
 +static int hbfontslen = 0;
 +static HbFontMatch *hbfontcache = NULL;
 +
 +void
 +hbunloadfonts()
 +{
 +	for (int i = 0; i < hbfontslen; i++) {
 +		hb_font_destroy(hbfontcache[i].font);
 +		XftUnlockFace(hbfontcache[i].match);
 +	}
 +
 +	if (hbfontcache != NULL) {
 +		free(hbfontcache);
 +		hbfontcache = NULL;
 +	}
 +	hbfontslen = 0;
 +}
 +
 +hb_font_t *
 +hbfindfont(XftFont *match)
 +{
 +	for (int i = 0; i < hbfontslen; i++) {
 +		if (hbfontcache[i].match == match)
 +			return hbfontcache[i].font;
 +	}
 +
 +	/* Font not found in cache, caching it now. */
 +	hbfontcache = realloc(hbfontcache, sizeof(HbFontMatch) * (hbfontslen + 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[hbfontslen].match = match;
 +	hbfontcache[hbfontslen].font = font;
 +	hbfontslen += 1;
 +
 +	return font;
 +}
 +
 +void
 +hbtransform(XftGlyphFontSpec *specs, const Glyph *glyphs, size_t len, int x, int y)
 +{
 +	int start = 0, length = 1, gstart = 0;
 +	hb_codepoint_t *codepoints = calloc(len, sizeof(hb_codepoint_t));
 +
 +	for (int idx = 1, specidx = 1; idx < len; idx++) {
 +		if (glyphs[idx].mode & ATTR_WDUMMY) {
 +			length += 1;
 +			continue;
 +		}
 +
 +		if (specs[specidx].font != specs[start].font || ATTRCMP(glyphs[gstart], glyphs[idx]) || selected(x + idx, y) != selected(x + gstart, y)) {
 +			hbtransformsegment(specs[start].font, glyphs, codepoints, gstart, length);
 +
 +			/* Reset the sequence. */
 +			length = 1;
 +			start = specidx;
 +			gstart = idx;
 +		} else {
 +			length += 1;
 +		}
 +
 +		specidx++;
 +	}
 +
 +	/* EOL. */
 +	hbtransformsegment(specs[start].font, glyphs, codepoints, gstart, length);
 +
 +	/* Apply the transformation to glyph specs. */
 +	for (int i = 0, specidx = 0; i < len; i++) {
 +		if (glyphs[i].mode & ATTR_WDUMMY)
 +			continue;
 +
 +		if (codepoints[i] != specs[specidx].glyph)
 +			((Glyph *)glyphs)[i].mode |= ATTR_LIGA;
 +
 +		specs[specidx++].glyph = codepoints[i];
 +	}
 +
 +	free(codepoints);
 +}
 +
 +void
 +hbtransformsegment(XftFont *xfont, const Glyph *string, hb_codepoint_t *codepoints, int start, int length)
 +{
 +	hb_font_t *font = hbfindfont(xfont);
 +	if (font == NULL)
 +		return;
 +
 +	Rune rune;
 +	ushort mode = USHRT_MAX;
 +	hb_buffer_t *buffer = hb_buffer_create();
 +	hb_buffer_set_direction(buffer, HB_DIRECTION_LTR);
 +
 +	/* Fill buffer with codepoints. */
 +	for (int i = start; i < (start+length); i++) {
 +		rune = string[i].u;
 +		mode = string[i].mode;
 +		if (mode & ATTR_WDUMMY)
 +			rune = 0x0020;
 +		hb_buffer_add_codepoints(buffer, &rune, 1, 0, 1);
 +	}
 +
 +	/* Shape the segment. */
 +	hb_shape(font, buffer, NULL, 0);
 +
 +	/* Get new glyph info. */
 +	hb_glyph_info_t *info = hb_buffer_get_glyph_infos(buffer, NULL);
 +
 +	/* Write new codepoints. */
 +	for (int i = 0; i < length; i++) {
 +		hb_codepoint_t gid = info[i].codepoint;
 +		codepoints[start+i] = gid;
 +	}
 +
 +	/* Cleanup. */
 +	hb_buffer_destroy(buffer);
 +}
 diff --git a/hb.h b/hb.h
 new file mode 100644
 index 0000000..a209238
 --- /dev/null
 +++ b/hb.h
 @@ -0,0 +1,7 @@
 +#include <X11/Xft/Xft.h>
 +#include <hb.h>
 +#include <hb-ft.h>
 +
 +void hbunloadfonts();
 +void hbtransform(XftGlyphFontSpec *, const Glyph *, size_t, int, int);
 +
 diff --git a/st.c b/st.c
 index f8b6f67..a6c3ee7 100644
 --- a/st.c
 +++ b/st.c
 @@ -2656,7 +2656,8 @@ draw(void)
  	drawregion(0, 0, term.col, term.row);
 	if (term.scr == 0)
 		xdrawcursor(cx, term.c.y, term.line[term.c.y][cx],
 -				term.ocx, term.ocy, term.line[term.ocy][term.ocx]);
 +				term.ocx, term.ocy, term.line[term.ocy][term.ocx],
 +				term.line[term.ocy], term.col);
  	term.ocx = cx, term.ocy = term.c.y;
  	xfinishdraw();
  	xximspot(term.ocx, term.ocy);
 diff --git a/st.h b/st.h
 index c67ebc3..073ae82 100644
 --- a/st.h
 +++ b/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) & (~ATTR_LIGA)) != ((b).mode & (~ATTR_WRAP) & (~ATTR_LIGA)) || \
 +				(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)
 @@ -33,6 +34,7 @@ enum glyph_attribute {
  	ATTR_WRAP       = 1 << 8,
  	ATTR_WIDE       = 1 << 9,
  	ATTR_WDUMMY     = 1 << 10,
 +	ATTR_LIGA       = 1 << 11,
  	ATTR_BOLD_FAINT = ATTR_BOLD | ATTR_FAINT,
  };
  
 diff --git a/win.h b/win.h
 index a6ef1b9..bc0d180 100644
 --- a/win.h
 +++ b/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);
 diff --git a/x.c b/x.c
 index 139f7ff..eaf764f 100644
 --- a/x.c
 +++ b/x.c
 @@ -19,6 +19,7 @@ static char *argv0;
  #include "arg.h"
  #include "st.h"
  #include "win.h"
 +#include "hb.h"
  
  /* types used in config.h */
  typedef struct {
 @@ -1040,6 +1041,9 @@ 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);
 @@ -1246,7 +1250,7 @@ xmakeglyphfontspecs(XftGlyphFontSpec *specs, const Glyph *glyphs, int len, int x
  		mode = glyphs[i].mode;
  
  		/* Skip dummy wide-character spacing. */
 -		if (mode == ATTR_WDUMMY)
 +		if (mode & ATTR_WDUMMY)
  			continue;
  
  		/* Determine font for glyph if different from previous glyph. */
 @@ -1353,6 +1357,9 @@ xmakeglyphfontspecs(XftGlyphFontSpec *specs, const Glyph *glyphs, int len, int x
  		numspecs++;
  	}
  
 +	/* Harfbuzz transformation for ligatures. */
 +	hbtransform(specs, glyphs, len, x, y);
 +
  	return numspecs;
  }
  
 @@ -1502,14 +1509,17 @@ 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;
  
  	/* 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;