commit dcfbb91428b0a99730e4c0e3111535efd55be40c
parent 6aec9907d5a198997f0a241b326f889449c248ae
Author: Matthew Carlson <matt@mcarlson.xyz>
Date: Mon, 12 Jul 2021 04:48:36 +0000
ligatures
Diffstat:
| M | Makefile | | | 6 | ++++-- |
| M | config.mk | | | 6 | ++++-- |
| A | hb.c | | | 140 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | hb.h | | | 6 | ++++++ |
| M | st.c | | | 3 | ++- |
| M | st.h | | | 7 | +++++-- |
| M | win.h | | | 2 | +- |
| M | x.c | | | 16 | +++++++++++++--- |
8 files changed, 175 insertions(+), 11 deletions(-)
diff --git a/Makefile b/Makefile
@@ -4,7 +4,7 @@
include config.mk
-SRC = st.c x.c
+SRC = st.c x.c boxdraw.c hb.c
OBJ = $(SRC:.c=.o)
all: options st
@@ -22,7 +22,9 @@ 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
+boxdraw.o: config.h st.h boxdraw_data.h
$(OBJ): config.h config.mk
diff --git a/config.mk b/config.mk
@@ -15,10 +15,12 @@ PKG_CONFIG = pkg-config
# includes and libs
INCS = -I$(X11INC) \
`$(PKG_CONFIG) --cflags fontconfig` \
- `$(PKG_CONFIG) --cflags freetype2`
+ `$(PKG_CONFIG) --cflags freetype2` \
+ `$(PKG_CONFIG) --cflags harfbuzz`
LIBS = -L$(X11LIB) -lm -lrt -lX11 -lutil -lXft \
`$(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
@@ -0,0 +1,140 @@
+#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 (glyphs[i].mode & ATTR_BOXDRAW) {
+ specidx++;
+ 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
@@ -0,0 +1,6 @@
+#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
@@ -2591,7 +2591,8 @@ draw(void)
drawregion(0, 0, term.col, term.row);
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();
diff --git a/st.h b/st.h
@@ -11,8 +11,9 @@
#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 || \
- (a).bg != (b).bg)
+#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)
#define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
@@ -33,6 +34,8 @@ enum glyph_attribute {
ATTR_WRAP = 1 << 8,
ATTR_WIDE = 1 << 9,
ATTR_WDUMMY = 1 << 10,
+ ATTR_BOXDRAW = 1 << 11,
+ ATTR_LIGA = 1 << 12,
ATTR_BOLD_FAINT = ATTR_BOLD | ATTR_FAINT,
};
diff --git 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
@@ -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 {
@@ -1033,6 +1034,9 @@ 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);
@@ -1232,7 +1236,7 @@ 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. */
@@ -1339,6 +1343,9 @@ xmakeglyphfontspecs(XftGlyphFontSpec *specs, const Glyph *glyphs, int len, int x
numspecs++;
}
+ /* Harfbuzz transformation for ligatures. */
+ hbtransform(specs, glyphs, len, x, y);
+
return numspecs;
}
@@ -1488,14 +1495,17 @@ 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;
