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#include "term.h"
#include <X11/Xft/Xft.h>
#include <harfbuzz/hb-ft.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 }
hb_font_t *hbfindfont(XftFont *match);
void hbtransformsegment(XftFont *xfont, const Letter *glyph, rune *codepoints, int start, int end);
typedef struct
{
XftFont *match;
hb_font_t *font;
} HbFontMatch;
static int hbfontslen = 0;
static HbFontMatch *hbfontcache = nil;
/*
* Replace 0 with a list of font features, wrapped in FEATURE macro, e.g.
* FEATURE('c', 'a', 'l', 't'), FEATURE('d', 'l', 'i', 'g')
*/
hb_feature_t features[] = { 0 };
void
hbunloadfonts()
{
int i;
for(i = 0; i < hbfontslen; i++) {
hb_font_destroy(hbfontcache[i].font);
XftUnlockFace(hbfontcache[i].match);
}
if(hbfontcache != nil) {
free(hbfontcache);
hbfontcache = nil;
}
hbfontslen = 0;
}
hb_font_t *
hbfindfont(XftFont *match)
{
int i;
for (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)
fatal("failed to load Harfbuzz font.");
hbfontcache[hbfontslen].match = match;
hbfontcache[hbfontslen].font = font;
hbfontslen += 1;
return font;
}
void
hbtransform(XftGlyphFontSpec *specs, const Letter *glyphs, size_t len, int x, int y)
{
int idx, specidx, start = 0, length = 1, gstart = 0;
rune *runes = calloc((unsigned int)len, sizeof(hb_codepoint_t));
for(idx = 1, specidx = 1; idx < len; idx++) {
if(glyphs[idx].mode & Gwdummy) {
length += 1;
continue;
}
if(specs[specidx].font != specs[start].font
|| GLYPHCMP(glyphs[gstart], glyphs[idx])
|| selected(x + idx, y) != selected(x + gstart, y)
) {
hbtransformsegment(specs[start].font, glyphs, runes, gstart, length);
/* reset the sequence. */
length = 1;
start = specidx;
gstart = idx;
} else {
length += 1;
}
specidx++;
}
/* eol */
hbtransformsegment(specs[start].font, glyphs, runes, gstart, length);
/* apply the transformation to glyph specs. */
for(idx = 0, specidx = 0; idx < len; idx++) {
if(glyphs[idx].mode & Gwdummy)
continue;
if(runes[idx] != specs[specidx].glyph)
((Letter *)glyphs)[idx].mode |= Gliga;
specs[specidx++].glyph = runes[idx];
}
free(runes);
}
void
hbtransformsegment(XftFont *xfont, const Letter *glyph, rune *codepoints, int start, int len)
{
hb_font_t *font = hbfindfont(xfont);
if(!font)
return;
int i;
rune r;
ushort mode = USHRT_MAX;
hb_buffer_t *buffer = hb_buffer_create();
hb_buffer_set_direction(buffer, HB_DIRECTION_LTR);
/* Fill buffer with codepoints. */
for(i=start; i < (start+len); i++) {
r = glyph[i].u;
mode = glyph[i].mode;
if(mode & Gwdummy)
r = 0x0020;
hb_buffer_add_codepoints(buffer, &r, 1, 0, 1);
}
/* Shape the segment. */
hb_shape(font, buffer, features, sizeof(features));
/* Get new glyph info. */
hb_glyph_info_t *info = hb_buffer_get_glyph_infos(buffer, NULL);
/* Write new codepoints. */
for(i = 0; i < len; i++) {
r = info[i].codepoint;
codepoints[start+i] = r;
}
/* Cleanup. */
hb_buffer_destroy(buffer);
}
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