92 lines
2.4 KiB
C
92 lines
2.4 KiB
C
/*
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* glyph-cache.c
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* Copyright (C) 2021 Kovid Goyal <kovid at kovidgoyal.net>
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*
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* Distributed under terms of the GPL3 license.
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*/
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#include "glyph-cache.h"
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#include "kitty-uthash.h"
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typedef struct SpritePosItem {
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SpritePositionHead
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UT_hash_handle hh;
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glyph_index key[];
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} SpritePosItem;
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static glyph_index *scratch = NULL;
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static unsigned scratch_sz = 0;
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void
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free_glyph_cache_global_resources(void) {
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free(scratch);
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scratch = NULL; scratch_sz = 0;
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}
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static inline unsigned
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key_size_for_glyph_count(unsigned count) { return count + 2; }
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SpritePosition*
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find_or_create_sprite_position(SpritePosition **head_, glyph_index *glyphs, glyph_index count, glyph_index ligature_index, bool *created) {
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SpritePosItem **head = (SpritePosItem**)head_, *p;
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const unsigned key_sz = key_size_for_glyph_count(count);
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if (key_sz > scratch_sz) {
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scratch = realloc(scratch, sizeof(glyph_index) * (key_sz + 16));
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if (!scratch) return NULL;
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scratch_sz = key_sz + 16;
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}
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const unsigned key_sz_bytes = key_sz * sizeof(glyph_index);
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scratch[0] = count; scratch[1] = ligature_index;
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memcpy(scratch + 2, glyphs, count * sizeof(glyph_index));
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HASH_FIND(hh, *head, scratch, key_sz_bytes, p);
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if (p) { *created = false; return (SpritePosition*)p; }
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p = calloc(1, sizeof(SpritePosItem) + key_sz_bytes);
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if (!p) return NULL;
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memcpy(p->key, scratch, key_sz_bytes);
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HASH_ADD(hh, *head, key, key_sz_bytes, p);
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*created = true;
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return (SpritePosition*)p;
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}
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void
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free_sprite_position_hash_table(SpritePosition **head_) {
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SpritePosItem **head = (SpritePosItem**)head_, *s, *tmp;
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HASH_ITER(hh, *head, s, tmp) {
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HASH_DEL(*head, s);
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free(s);
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}
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}
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typedef struct GlyphPropertiesItem {
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GlyphPropertiesHead
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UT_hash_handle hh;
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unsigned key;
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} GlyphPropertiesItem;
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GlyphProperties*
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find_or_create_glyph_properties(GlyphProperties **head_, unsigned glyph) {
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GlyphPropertiesItem **head = (GlyphPropertiesItem**)head_, *p;
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HASH_FIND_INT(*head, &glyph, p);
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if (p) return (GlyphProperties*)p;
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p = calloc(1, sizeof(GlyphPropertiesItem));
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if (!p) return NULL;
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p->key = glyph;
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HASH_ADD_INT(*head, key, p);
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return (GlyphProperties*)p;
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}
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void
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free_glyph_properties_hash_table(GlyphProperties **head_) {
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GlyphPropertiesItem **head = (GlyphPropertiesItem**)head_, *s, *tmp;
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HASH_ITER(hh, *head, s, tmp) {
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HASH_DEL(*head, s);
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free(s);
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}
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}
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