50 lines
1.6 KiB
C
50 lines
1.6 KiB
C
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/* HFGlyphTrie is used to represent a trie of glyphs that allows multiple concurrent readers, along with one writer. */
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#import <ApplicationServices/ApplicationServices.h>
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/* BranchFactor is in bits */
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#define kHFGlyphTrieBranchFactor 4
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#define kHFGlyphTrieBranchCount (1 << kHFGlyphTrieBranchFactor)
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typedef uint16_t HFGlyphFontIndex;
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#define kHFGlyphFontIndexInvalid ((HFGlyphFontIndex)(-1))
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#define kHFGlyphInvalid kCGFontIndexInvalid
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struct HFGlyph_t {
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HFGlyphFontIndex fontIndex;
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CGGlyph glyph;
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};
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static inline BOOL HFGlyphEqualsGlyph(struct HFGlyph_t a, struct HFGlyph_t b) __attribute__((unused));
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static inline BOOL HFGlyphEqualsGlyph(struct HFGlyph_t a, struct HFGlyph_t b) {
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return a.glyph == b.glyph && a.fontIndex == b.fontIndex;
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}
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struct HFGlyphTrieBranch_t {
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__strong void *children[kHFGlyphTrieBranchCount];
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};
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struct HFGlyphTrieLeaf_t {
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struct HFGlyph_t glyphs[kHFGlyphTrieBranchCount];
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};
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struct HFGlyphTrie_t {
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uint8_t branchingDepth;
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struct HFGlyphTrieBranch_t root;
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};
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/* Initializes a trie witha given key size */
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__private_extern__ void HFGlyphTrieInitialize(struct HFGlyphTrie_t *trie, uint8_t keySize);
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/* Inserts a glyph into the trie */
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__private_extern__ void HFGlyphTrieInsert(struct HFGlyphTrie_t *trie, NSUInteger key, struct HFGlyph_t value);
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/* Attempts to fetch a glyph. If the glyph is not present, returns an HFGlyph_t set to all bits 0. */
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__private_extern__ struct HFGlyph_t HFGlyphTrieGet(const struct HFGlyphTrie_t *trie, NSUInteger key);
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/* Frees all storage associated with a glyph tree. This is not necessary to call under GC. */
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__private_extern__ void HFGlyphTreeFree(struct HFGlyphTrie_t * trie);
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