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/*
* Copyright (C) 2006 Evgeniy Stepanov <eugeni.stepanov@gmail.com>
* Copyright (C) 2011 Grigori Goronzy <greg@chown.ath.cx>
*
* This file is part of libass.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef LIBASS_CACHE_H
#define LIBASS_CACHE_H
#include "ass.h"
#include "ass_font.h"
#include "ass_bitmap.h"
typedef struct cache Cache;
// cache values
typedef struct {
Bitmap *bm; // the actual bitmaps
Bitmap *bm_o;
Bitmap *bm_s;
} BitmapHashValue;
typedef struct {
unsigned char *a;
unsigned char *b;
} CompositeHashValue;
typedef struct {
FT_Library lib;
FT_Outline *outline;
FT_Outline *border;
FT_BBox bbox_scaled; // bbox after scaling, but before rotation
FT_Vector advance; // 26.6, advance distance to the next outline in line
int asc, desc; // ascender/descender
} OutlineHashValue;
typedef struct {
FT_Glyph_Metrics metrics;
} GlyphMetricsHashValue;
// Create definitions for bitmap, outline and composite hash keys
#define CREATE_STRUCT_DEFINITIONS
#include "ass_cache_template.h"
// Type-specific function pointers
typedef unsigned(*HashFunction)(void *key, size_t key_size);
typedef size_t(*ItemSize)(void *value, size_t value_size);
typedef unsigned(*HashCompare)(void *a, void *b, size_t key_size);
typedef void(*CacheItemDestructor)(void *key, void *value);
// cache hash keys
typedef struct outline_hash_key {
enum {
OUTLINE_GLYPH,
OUTLINE_DRAWING,
} type;
union {
GlyphHashKey glyph;
DrawingHashKey drawing;
} u;
} OutlineHashKey;
typedef struct bitmap_hash_key {
enum {
BITMAP_OUTLINE,
BITMAP_CLIP,
} type;
union {
OutlineBitmapHashKey outline;
ClipMaskHashKey clip;
} u;
} BitmapHashKey;
Cache *ass_cache_create(HashFunction hash_func, HashCompare compare_func,
CacheItemDestructor destruct_func, ItemSize size_func,
size_t key_size, size_t value_size);
void *ass_cache_put(Cache *cache, void *key, void *value);
void *ass_cache_get(Cache *cache, void *key);
int ass_cache_empty(Cache *cache, size_t max_size);
void ass_cache_stats(Cache *cache, size_t *size, unsigned *hits,
unsigned *misses, unsigned *count);
void ass_cache_done(Cache *cache);
Cache *ass_font_cache_create(void);
Cache *ass_outline_cache_create(void);
Cache *ass_glyph_metrics_cache_create(void);
Cache *ass_bitmap_cache_create(void);
Cache *ass_composite_cache_create(void);
#endif /* LIBASS_CACHE_H */
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