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ligatures: upgrading patch

This commit is contained in:
Bakkeby 2022-12-19 10:09:06 +01:00
parent e6a2fb489c
commit bd370228a4
3 changed files with 192 additions and 82 deletions
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88
hb.c
View File

@ -8,10 +8,10 @@
#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 }
void hbtransformsegment(XftFont *xfont, const Glyph *string, hb_codepoint_t *codepoints, int start, int length);
hb_font_t *hbfindfont(XftFont *match);
typedef struct {
@ -66,72 +66,23 @@ hbfindfont(XftFont *match)
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((unsigned int)len, sizeof(hb_codepoint_t));
void hbtransform(HbTransformData *data, XftFont *xfont, const Glyph *glyphs, int start, int length) {
Rune rune;
ushort mode = USHRT_MAX;
unsigned int glyph_count;
int i, end = start + length;
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 BOXDRAW_PATCH
if (glyphs[i].mode & ATTR_BOXDRAW) {
specidx++;
continue;
}
#endif
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;
for (i = start; i < end; i++) {
rune = glyphs[i].u;
mode = glyphs[i].mode;
if (mode & ATTR_WDUMMY)
rune = 0x0020;
hb_buffer_add_codepoints(buffer, &rune, 1, 0, 1);
@ -141,14 +92,17 @@ hbtransformsegment(XftFont *xfont, const Glyph *string, hb_codepoint_t *codepoin
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, NULL);
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);
/* 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);
/** 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));
}

10
hb.h
View File

@ -2,5 +2,13 @@
#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(XftGlyphFontSpec *, const Glyph *, size_t, int, int);
void hbtransform(HbTransformData *, XftFont *, const Glyph *, int, int);
void hbcleanup(HbTransformData *);

176
x.c
View File

@ -80,6 +80,9 @@ static void xdrawglyphfontspecs(const XftGlyphFontSpec *, Glyph, int, int, int,
#else
static void xdrawglyphfontspecs(const XftGlyphFontSpec *, Glyph, int, int, int);
#endif // WIDE_GLYPHS_PATCH
#if LIGATURES_PATCH
static void xresetfontsettings(ushort mode, Font **font, int *frcflags);
#endif // LIGATURES_PATCH
static void xdrawglyph(Glyph, int, int);
static void xclear(int, int, int, int);
static int xgeommasktogravity(int);
@ -1605,6 +1608,24 @@ xinit(int cols, int rows)
#endif // BOXDRAW_PATCH
}
#if LIGATURES_PATCH
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;
}
}
#endif // LIGATURES_PATCH
int
xmakeglyphfontspecs(XftGlyphFontSpec *specs, const Glyph *glyphs, int len, int x, int y)
{
@ -1624,6 +1645,14 @@ xmakeglyphfontspecs(XftGlyphFontSpec *specs, const Glyph *glyphs, int len, int x
FcFontSet *fcsets[] = { NULL };
FcCharSet *fccharset;
int i, f, numspecs = 0;
#if LIGATURES_PATCH
int length = 0, start = 0;
HbTransformData shaped = { 0 };
/* Initial values. */
mode = prevmode = glyphs[0].mode;
xresetfontsettings(mode, &font, &frcflags);
#endif // LIGATURES_PATCH
#if VERTCENTER_PATCH
for (i = 0, xp = winx, yp = winy + font->ascent + win.cyo; i < len; ++i)
@ -1637,17 +1666,143 @@ xmakeglyphfontspecs(XftGlyphFontSpec *specs, const Glyph *glyphs, int len, int x
historyOverlay(x+i, y, &g);
rune = g.u;
mode = g.mode;
#elif LIGATURES_PATCH
mode = glyphs[i].mode;
#else
rune = glyphs[i].u;
mode = glyphs[i].mode;
#endif // VIM_BROWSE_PATCH
#endif // VIM_BROWSE_PATCH | LIGATURES_PATCH
/* Skip dummy wide-character spacing. */
#if LIGATURES_PATCH
if (mode & ATTR_WDUMMY)
#else
continue;
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);
}
/* Shape the segment. */
hbtransform(&shaped, font->match, glyphs, start, length);
for (int code_idx = 0; code_idx < shaped.count; code_idx++) {
rune = glyphs[start + code_idx].u;
runewidth = win.cw * ((glyphs[start + code_idx].mode & ATTR_WIDE) ? 2.0f : 1.0f);
if (glyphs[start + code_idx].mode & ATTR_WDUMMY)
continue;
#if BOXDRAW_PATCH
if (glyphs[start + code_idx].mode & ATTR_BOXDRAW) {
/* minor shoehorning: boxdraw uses only this ushort */
specs[numspecs].font = font->match;
specs[numspecs].glyph = boxdrawindex(&glyphs[start + code_idx]);
specs[numspecs].x = xp;
specs[numspecs].y = yp;
xp += runewidth;
numspecs++;
} else
#endif // BOXDRAW_PATCH
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 = xp + (short)shaped.positions[code_idx].x_offset;
specs[numspecs].y = yp + (short)shaped.positions[code_idx].y_offset;
xp += runewidth;
numspecs++;
} else {
/* If it's not found, try to fetch it through the font cache. */
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;
xp += runewidth;
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;
}
}
#else // !LIGATURES_PATCH
if (mode == ATTR_WDUMMY)
#endif // LIGATURES_PATCH
continue;
/* Determine font for glyph if different from previous glyph. */
@ -1711,8 +1866,7 @@ xmakeglyphfontspecs(XftGlyphFontSpec *specs, const Glyph *glyphs, int len, int x
/* Nothing was found. Use fontconfig to find matching font. */
if (f >= frclen) {
if (!font->set)
font->set = FcFontSort(0, font->pattern,
1, 0, &fcres);
font->set = FcFontSort(0, font->pattern, 1, 0, &fcres);
fcsets[0] = font->set;
/*
@ -1726,8 +1880,7 @@ xmakeglyphfontspecs(XftGlyphFontSpec *specs, const Glyph *glyphs, int len, int x
fccharset = FcCharSetCreate();
FcCharSetAddChar(fccharset, rune);
FcPatternAddCharSet(fcpattern, FC_CHARSET,
fccharset);
FcPatternAddCharSet(fcpattern, FC_CHARSET, fccharset);
FcPatternAddBool(fcpattern, FC_SCALABLE, 1);
#if !USE_XFTFONTMATCH_PATCH
@ -1743,8 +1896,7 @@ xmakeglyphfontspecs(XftGlyphFontSpec *specs, const Glyph *glyphs, int len, int x
frc = xrealloc(frc, frccap * sizeof(Fontcache));
}
frc[frclen].font = XftFontOpenPattern(xw.dpy,
fontpattern);
frc[frclen].font = XftFontOpenPattern(xw.dpy, fontpattern);
if (!frc[frclen].font)
die("XftFontOpenPattern failed seeking fallback font: %s\n",
strerror(errno));
@ -1766,12 +1918,8 @@ xmakeglyphfontspecs(XftGlyphFontSpec *specs, const Glyph *glyphs, int len, int x
specs[numspecs].y = (short)yp;
xp += runewidth;
numspecs++;
}
#if LIGATURES_PATCH
/* Harfbuzz transformation for ligatures. */
hbtransform(specs, glyphs, len, x, y);
#endif // LIGATURES_PATCH
}
return numspecs;
}