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Add support for stylistic sets

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Other OTF tags may also work
This commit is contained in:
wundrweapon 2020-07-12 18:54:32 -04:00
parent e187610a23
commit 35a662dbdc
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GPG key ID: BA156835EAB42DC5
4 changed files with 35 additions and 10 deletions
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10
config.h
View file

@ -9,6 +9,16 @@ static char *font = "mono:pixelsize=14:antialias=true:autohint=true";
static char *font2[] = { "JoyPixels:pixelsize=10:antialias=true:autohint=true" };
static int borderpx = 2;
/*
* Extra font features; generally used for stylistic sets
* Ensure numuserfeats is equal to the length of the userfeats array
* Note: value will always be set to 1; should be fine for stylistic sets
*
* Example array for numuserfeats = 3: {"ss02", "ss08", "onum"}
*/
static int numuserfeats = 0;
static char *userfeats[] = {};
/*
* What program is execed by st depends of these precedence rules:
* 1: program passed with -e

30
hb.c
View file

@ -1,13 +1,14 @@
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <errno.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);
void hbtransformsegment(XftFont *xfont, const Glyph *string, hb_codepoint_t *codepoints, int start, int length, char **userfeats, int numuserfeats);
hb_font_t *hbfindfont(XftFont *match);
typedef struct {
@ -56,7 +57,7 @@ hbfindfont(XftFont *match)
}
void
hbtransform(XftGlyphFontSpec *specs, const Glyph *glyphs, size_t len, int x, int y)
hbtransform(XftGlyphFontSpec *specs, const Glyph *glyphs, size_t len, int x, int y, char **userfeats, int numuserfeats)
{
int start = 0, length = 1, gstart = 0;
hb_codepoint_t *codepoints = calloc(len, sizeof(hb_codepoint_t));
@ -68,7 +69,7 @@ hbtransform(XftGlyphFontSpec *specs, const Glyph *glyphs, size_t len, int x, int
}
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);
hbtransformsegment(specs[start].font, glyphs, codepoints, gstart, length, userfeats, numuserfeats);
/* Reset the sequence. */
length = 1;
@ -82,7 +83,7 @@ hbtransform(XftGlyphFontSpec *specs, const Glyph *glyphs, size_t len, int x, int
}
/* EOL. */
hbtransformsegment(specs[start].font, glyphs, codepoints, gstart, length);
hbtransformsegment(specs[start].font, glyphs, codepoints, gstart, length, userfeats, numuserfeats);
/* Apply the transformation to glyph specs. */
for (int i = 0, specidx = 0; i < len; i++) {
@ -103,7 +104,7 @@ hbtransform(XftGlyphFontSpec *specs, const Glyph *glyphs, size_t len, int x, int
}
void
hbtransformsegment(XftFont *xfont, const Glyph *string, hb_codepoint_t *codepoints, int start, int length)
hbtransformsegment(XftFont *xfont, const Glyph *string, hb_codepoint_t *codepoints, int start, int length, char **userfeats, int numuserfeats)
{
hb_font_t *font = hbfindfont(xfont);
if (font == NULL)
@ -123,8 +124,23 @@ hbtransformsegment(XftFont *xfont, const Glyph *string, hb_codepoint_t *codepoin
hb_buffer_add_codepoints(buffer, &rune, 1, 0, 1);
}
/* Shape the segment. */
hb_shape(font, buffer, NULL, 0);
/* Prep user features for OpenType tags. */
hb_feature_t *ufeats = calloc(numuserfeats, sizeof(hb_feature_t));
if (errno == ENOMEM)
ufeats = NULL;
if (ufeats) {
for (int i = 0; i < numuserfeats; i++) {
ufeats[i].tag = HB_TAG(userfeats[i][0], userfeats[i][1], userfeats[i][2], userfeats[i][3]);
ufeats[i].value = 1;
ufeats[i].start = HB_FEATURE_GLOBAL_START;
ufeats[i].end = HB_FEATURE_GLOBAL_END;
}
}
/* Shape the segment and free the calloc'd feature array. */
hb_shape(font, buffer, ufeats, ufeats ? numuserfeats : 0);
free(ufeats);
/* Get new glyph info. */
hb_glyph_info_t *info = hb_buffer_get_glyph_infos(buffer, NULL);

3
hb.h
View file

@ -3,5 +3,4 @@
#include <hb-ft.h>
void hbunloadfonts();
void hbtransform(XftGlyphFontSpec *, const Glyph *, size_t, int, int);
void hbtransform(XftGlyphFontSpec *, const Glyph *, size_t, int, int, char **, int);

2
x.c
View file

@ -1448,7 +1448,7 @@ xmakeglyphfontspecs(XftGlyphFontSpec *specs, const Glyph *glyphs, int len, int x
}
/* Harfbuzz transformation for ligatures. */
hbtransform(specs, glyphs, len, x, y);
hbtransform(specs, glyphs, len, x, y, userfeats, numuserfeats);
return numspecs;
}