st-flexipatch

My st-flexipatch configuration
git clone git://git.ethandl.dev/st-flexipatch
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hb.c (3453B)

      1 #include <stdlib.h>
      2 #include <stdio.h>
      3 #include <math.h>
      4 #include <time.h>
      5 #include <X11/Xft/Xft.h>
      6 #include <X11/cursorfont.h>
      7 #include <hb.h>
      8 #include <hb-ft.h>
      9 
     10 #include "st.h"
     11 #include "hb.h"
     12 
     13 #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 }
     14 #define BUFFER_STEP 256
     15 
     16 hb_font_t *hbfindfont(XftFont *match);
     17 
     18 typedef struct {
     19 	XftFont *match;
     20 	hb_font_t *font;
     21 } HbFontMatch;
     22 
     23 typedef struct {
     24 	size_t capacity;
     25 	HbFontMatch *fonts;
     26 } HbFontCache;
     27 
     28 static HbFontCache hbfontcache = { 0, NULL };
     29 
     30 typedef struct {
     31 	size_t capacity;
     32 	Rune *runes;
     33 } RuneBuffer;
     34 
     35 static RuneBuffer hbrunebuffer = { 0, NULL };
     36 static hb_buffer_t *hbbuffer;
     37 
     38 /*
     39  * Poplulate the array with a list of font features, wrapped in FEATURE macro,
     40  * e. g.
     41  * FEATURE('c', 'a', 'l', 't'), FEATURE('d', 'l', 'i', 'g')
     42  */
     43 hb_feature_t features[] = { };
     44 
     45 void
     46 hbcreatebuffer(void)
     47 {
     48 	hbbuffer = hb_buffer_create();
     49 }
     50 
     51 void
     52 hbdestroybuffer(void)
     53 {
     54 	hb_buffer_destroy(hbbuffer);
     55 }
     56 
     57 void
     58 hbunloadfonts(void)
     59 {
     60 	for (int i = 0; i < hbfontcache.capacity; i++) {
     61 		hb_font_destroy(hbfontcache.fonts[i].font);
     62 		XftUnlockFace(hbfontcache.fonts[i].match);
     63 	}
     64 
     65 	if (hbfontcache.fonts != NULL) {
     66 		free(hbfontcache.fonts);
     67 		hbfontcache.fonts = NULL;
     68 	}
     69 	hbfontcache.capacity = 0;
     70 }
     71 
     72 hb_font_t *
     73 hbfindfont(XftFont *match)
     74 {
     75 	for (int i = 0; i < hbfontcache.capacity; i++) {
     76 		if (hbfontcache.fonts[i].match == match)
     77 			return hbfontcache.fonts[i].font;
     78 	}
     79 
     80 	/* Font not found in cache, caching it now. */
     81 	hbfontcache.fonts = realloc(hbfontcache.fonts, sizeof(HbFontMatch) * (hbfontcache.capacity + 1));
     82 	FT_Face face = XftLockFace(match);
     83 	hb_font_t *font = hb_ft_font_create(face, NULL);
     84 	if (font == NULL)
     85 		die("Failed to load Harfbuzz font.");
     86 
     87 	hbfontcache.fonts[hbfontcache.capacity].match = match;
     88 	hbfontcache.fonts[hbfontcache.capacity].font = font;
     89 	hbfontcache.capacity += 1;
     90 
     91 	return font;
     92 }
     93 
     94 void
     95 hbtransform(HbTransformData *data, XftFont *xfont, const Glyph *glyphs, int start, int length)
     96 {
     97 	uint32_t mode;
     98 	unsigned int glyph_count;
     99 	int rune_idx, glyph_idx, end = start + length;
    100 	hb_buffer_t *buffer = hbbuffer;
    101 
    102 	hb_font_t *font = hbfindfont(xfont);
    103 	if (font == NULL) {
    104 		data->count = 0;
    105 		return;
    106 	}
    107 
    108 	hb_buffer_reset(buffer);
    109 	hb_buffer_set_direction(buffer, HB_DIRECTION_LTR);
    110 	hb_buffer_set_cluster_level(buffer, HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS);
    111 
    112 	/* Resize the buffer if required length is larger. */
    113 	if (hbrunebuffer.capacity < length) {
    114 		hbrunebuffer.capacity = (length / BUFFER_STEP + 1) * BUFFER_STEP;
    115 		hbrunebuffer.runes = realloc(hbrunebuffer.runes, hbrunebuffer.capacity * sizeof(Rune));
    116 	}
    117 
    118 	/* Fill buffer with codepoints. */
    119 	for (rune_idx = 0, glyph_idx = start; glyph_idx < end; glyph_idx++, rune_idx++) {
    120 		hbrunebuffer.runes[rune_idx] = glyphs[glyph_idx].u;
    121 		mode = glyphs[glyph_idx].mode;
    122 		if (mode & ATTR_WDUMMY)
    123 			hbrunebuffer.runes[rune_idx] = 0x0020;
    124 	}
    125 	hb_buffer_add_codepoints(buffer, hbrunebuffer.runes, length, 0, length);
    126 
    127 	/* Shape the segment. */
    128 	hb_shape(font, buffer, features, sizeof(features)/sizeof(hb_feature_t));
    129 
    130 	/* Get new glyph info. */
    131 	hb_glyph_info_t *info = hb_buffer_get_glyph_infos(buffer, &glyph_count);
    132 	hb_glyph_position_t *pos = hb_buffer_get_glyph_positions(buffer, &glyph_count);
    133 
    134 	/* Fill the output. */
    135 	data->buffer = buffer;
    136 	data->glyphs = info;
    137 	data->positions = pos;
    138 	data->count = glyph_count;
    139 }