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- #include <stdlib.h>
- #include <stdio.h>
- #include <math.h>
- #include <X11/Xft/Xft.h>
- #include <X11/cursorfont.h>
- #include <hb.h>
- #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 }
- hb_font_t *hbfindfont(XftFont *match);
- typedef struct {
- XftFont *match;
- hb_font_t *font;
- } HbFontMatch;
- static int hbfontslen = 0;
- static HbFontMatch *hbfontcache = NULL;
- /*
- * Poplulate the array 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[] = { };
- 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(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;
- hb_font_t *font = hbfindfont(xfont);
- if (font == NULL)
- return;
- hb_buffer_t *buffer = hb_buffer_create();
- hb_buffer_set_direction(buffer, HB_DIRECTION_LTR);
- /* Fill buffer with codepoints. */
- 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);
- }
- /* Shape the segment. */
- 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, &glyph_count);
- hb_glyph_position_t *pos = hb_buffer_get_glyph_positions(buffer, &glyph_count);
- /** 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));
- }
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