137 lines
3.1 KiB
C
137 lines
3.1 KiB
C
#include <stdlib.h>
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#include <stdio.h>
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#include <math.h>
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#include <X11/Xft/Xft.h>
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#include <hb.h>
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#include <hb-ft.h>
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#include "st.h"
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void hbtransformsegment(XftFont *xfont, const Glyph *string, hb_codepoint_t *codepoints, int start, int length);
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hb_font_t *hbfindfont(XftFont *match);
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typedef struct {
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XftFont *match;
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hb_font_t *font;
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} HbFontMatch;
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static int hbfontslen = 0;
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static HbFontMatch *hbfontcache = NULL;
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void
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hbunloadfonts()
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{
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for (int i = 0; i < hbfontslen; i++) {
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hb_font_destroy(hbfontcache[i].font);
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XftUnlockFace(hbfontcache[i].match);
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}
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if (hbfontcache != NULL) {
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free(hbfontcache);
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hbfontcache = NULL;
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}
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hbfontslen = 0;
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}
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hb_font_t *
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hbfindfont(XftFont *match)
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{
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for (int i = 0; i < hbfontslen; i++) {
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if (hbfontcache[i].match == match)
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return hbfontcache[i].font;
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}
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/* Font not found in cache, caching it now. */
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hbfontcache = realloc(hbfontcache, sizeof(HbFontMatch) * (hbfontslen + 1));
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FT_Face face = XftLockFace(match);
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hb_font_t *font = hb_ft_font_create(face, NULL);
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if (font == NULL)
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die("Failed to load Harfbuzz font.");
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hbfontcache[hbfontslen].match = match;
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hbfontcache[hbfontslen].font = font;
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hbfontslen += 1;
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return font;
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}
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void
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hbtransform(XftGlyphFontSpec *specs, const Glyph *glyphs, size_t len, int x, int y)
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{
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int start = 0, length = 1, gstart = 0;
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hb_codepoint_t *codepoints = calloc(len, sizeof(hb_codepoint_t));
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for (int idx = 1, specidx = 1; idx < len; idx++) {
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if (glyphs[idx].mode & ATTR_WDUMMY) {
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length += 1;
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continue;
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}
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if (specs[specidx].font != specs[start].font || ATTRCMP(glyphs[gstart], glyphs[idx]) || selected(x + idx, y) != selected(x + gstart, y)) {
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hbtransformsegment(specs[start].font, glyphs, codepoints, gstart, length);
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/* Reset the sequence. */
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length = 1;
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start = specidx;
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gstart = idx;
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} else {
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length += 1;
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}
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specidx++;
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}
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/* EOL. */
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hbtransformsegment(specs[start].font, glyphs, codepoints, gstart, length);
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/* Apply the transformation to glyph specs. */
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for (int i = 0, specidx = 0; i < len; i++) {
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if (glyphs[i].mode & ATTR_WDUMMY)
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continue;
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if (codepoints[i] != specs[specidx].glyph)
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((Glyph *)glyphs)[i].mode |= ATTR_LIGA;
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specs[specidx++].glyph = codepoints[i];
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}
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free(codepoints);
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}
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void
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hbtransformsegment(XftFont *xfont, const Glyph *string, hb_codepoint_t *codepoints, int start, int length)
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{
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hb_font_t *font = hbfindfont(xfont);
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if (font == NULL)
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return;
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Rune rune;
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ushort mode = USHRT_MAX;
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hb_buffer_t *buffer = hb_buffer_create();
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hb_buffer_set_direction(buffer, HB_DIRECTION_LTR);
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/* Fill buffer with codepoints. */
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for (int i = start; i < (start+length); i++) {
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rune = string[i].u;
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mode = string[i].mode;
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if (mode & ATTR_WDUMMY)
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rune = 0x0020;
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hb_buffer_add_codepoints(buffer, &rune, 1, 0, 1);
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}
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/* Shape the segment. */
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hb_shape(font, buffer, NULL, 0);
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/* Get new glyph info. */
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hb_glyph_info_t *info = hb_buffer_get_glyph_infos(buffer, NULL);
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/* Write new codepoints. */
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for (int i = 0; i < length; i++) {
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hb_codepoint_t gid = info[i].codepoint;
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codepoints[start+i] = gid;
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}
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/* Cleanup. */
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hb_buffer_destroy(buffer);
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}
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