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140 lines
3.4 KiB
C
140 lines
3.4 KiB
C
#include <stdlib.h>
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#include <stdio.h>
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#include <math.h>
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#include <time.h>
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#include <X11/Xft/Xft.h>
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#include <X11/cursorfont.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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#include "hb.h"
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#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 }
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#define BUFFER_STEP 256
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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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typedef struct {
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size_t capacity;
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HbFontMatch *fonts;
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} HbFontCache;
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static HbFontCache hbfontcache = { 0, NULL };
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typedef struct {
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size_t capacity;
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Rune *runes;
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} RuneBuffer;
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static RuneBuffer hbrunebuffer = { 0, NULL };
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static hb_buffer_t *hbbuffer;
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/*
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* Poplulate the array with a list of font features, wrapped in FEATURE macro,
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* e. g.
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* FEATURE('c', 'a', 'l', 't'), FEATURE('d', 'l', 'i', 'g')
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*/
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hb_feature_t features[] = { };
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void
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hbcreatebuffer(void)
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{
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hbbuffer = hb_buffer_create();
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}
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void
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hbdestroybuffer(void)
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{
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hb_buffer_destroy(hbbuffer);
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}
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void
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hbunloadfonts(void)
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{
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for (int i = 0; i < hbfontcache.capacity; i++) {
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hb_font_destroy(hbfontcache.fonts[i].font);
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XftUnlockFace(hbfontcache.fonts[i].match);
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}
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if (hbfontcache.fonts != NULL) {
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free(hbfontcache.fonts);
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hbfontcache.fonts = NULL;
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}
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hbfontcache.capacity = 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 < hbfontcache.capacity; i++) {
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if (hbfontcache.fonts[i].match == match)
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return hbfontcache.fonts[i].font;
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}
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/* Font not found in cache, caching it now. */
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hbfontcache.fonts = realloc(hbfontcache.fonts, sizeof(HbFontMatch) * (hbfontcache.capacity + 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.fonts[hbfontcache.capacity].match = match;
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hbfontcache.fonts[hbfontcache.capacity].font = font;
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hbfontcache.capacity += 1;
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return font;
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}
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void
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hbtransform(HbTransformData *data, XftFont *xfont, const Glyph *glyphs, int start, int length)
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{
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uint32_t mode;
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unsigned int glyph_count;
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int rune_idx, glyph_idx, end = start + length;
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hb_buffer_t *buffer = hbbuffer;
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hb_font_t *font = hbfindfont(xfont);
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if (font == NULL) {
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data->count = 0;
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return;
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}
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hb_buffer_reset(buffer);
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hb_buffer_set_direction(buffer, HB_DIRECTION_LTR);
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hb_buffer_set_cluster_level(buffer, HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS);
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/* Resize the buffer if required length is larger. */
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if (hbrunebuffer.capacity < length) {
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hbrunebuffer.capacity = (length / BUFFER_STEP + 1) * BUFFER_STEP;
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hbrunebuffer.runes = realloc(hbrunebuffer.runes, hbrunebuffer.capacity * sizeof(Rune));
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}
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/* Fill buffer with codepoints. */
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for (rune_idx = 0, glyph_idx = start; glyph_idx < end; glyph_idx++, rune_idx++) {
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hbrunebuffer.runes[rune_idx] = glyphs[glyph_idx].u;
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mode = glyphs[glyph_idx].mode;
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if (mode & ATTR_WDUMMY)
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hbrunebuffer.runes[rune_idx] = 0x0020;
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}
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hb_buffer_add_codepoints(buffer, hbrunebuffer.runes, length, 0, length);
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/* Shape the segment. */
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hb_shape(font, buffer, features, sizeof(features)/sizeof(hb_feature_t));
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/* Get new glyph info. */
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hb_glyph_info_t *info = hb_buffer_get_glyph_infos(buffer, &glyph_count);
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hb_glyph_position_t *pos = hb_buffer_get_glyph_positions(buffer, &glyph_count);
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/* Fill the output. */
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data->buffer = buffer;
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data->glyphs = info;
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data->positions = pos;
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data->count = glyph_count;
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}
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