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Aegisub/aegisub/libass/ass_cache.c

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/*
* Copyright (C) 2006 Evgeniy Stepanov <eugeni.stepanov@gmail.com>
*
* This file is part of libass.
*
* libass is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* libass is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with libass; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include <inttypes.h>
#include <ft2build.h>
#include FT_FREETYPE_H
#include FT_GLYPH_H
#include <assert.h>
#include "ass_utils.h"
#include "ass.h"
#include "ass_fontconfig.h"
#include "ass_font.h"
#include "ass_bitmap.h"
#include "ass_cache.h"
static unsigned hashmap_hash(void *buf, size_t len)
{
return fnv_32a_buf(buf, len, FNV1_32A_INIT);
}
static int hashmap_key_compare(void *a, void *b, size_t size)
{
return memcmp(a, b, size) == 0;
}
static void hashmap_item_dtor(void *key, size_t key_size, void *value,
size_t value_size)
{
free(key);
free(value);
}
Hashmap *hashmap_init(ASS_Library *library, size_t key_size,
size_t value_size, int nbuckets,
HashmapItemDtor item_dtor,
HashmapKeyCompare key_compare,
HashmapHash hash)
{
Hashmap *map = calloc(1, sizeof(Hashmap));
map->library = library;
map->nbuckets = nbuckets;
map->key_size = key_size;
map->value_size = value_size;
map->root = calloc(nbuckets, sizeof(hashmap_item_p));
map->item_dtor = item_dtor ? item_dtor : hashmap_item_dtor;
map->key_compare = key_compare ? key_compare : hashmap_key_compare;
map->hash = hash ? hash : hashmap_hash;
return map;
}
void hashmap_done(Hashmap *map)
{
int i;
// print stats
if (map->count > 0 || map->hit_count + map->miss_count > 0)
ass_msg(map->library, MSGL_V,
"cache statistics: \n total accesses: %d\n hits: %d\n "
"misses: %d\n object count: %d",
map->hit_count + map->miss_count, map->hit_count,
map->miss_count, map->count);
for (i = 0; i < map->nbuckets; ++i) {
HashmapItem *item = map->root[i];
while (item) {
HashmapItem *next = item->next;
map->item_dtor(item->key, map->key_size, item->value,
map->value_size);
free(item);
item = next;
}
}
free(map->root);
free(map);
}
// does nothing if key already exists
void *hashmap_insert(Hashmap *map, void *key, void *value)
{
unsigned hash = map->hash(key, map->key_size);
HashmapItem **next = map->root + (hash % map->nbuckets);
while (*next) {
if (map->key_compare(key, (*next)->key, map->key_size))
return (*next)->value;
next = &((*next)->next);
assert(next);
}
(*next) = malloc(sizeof(HashmapItem));
(*next)->key = malloc(map->key_size);
(*next)->value = malloc(map->value_size);
memcpy((*next)->key, key, map->key_size);
memcpy((*next)->value, value, map->value_size);
(*next)->next = 0;
map->count++;
return (*next)->value;
}
void *hashmap_find(Hashmap *map, void *key)
{
unsigned hash = map->hash(key, map->key_size);
HashmapItem *item = map->root[hash % map->nbuckets];
while (item) {
if (map->key_compare(key, item->key, map->key_size)) {
map->hit_count++;
return item->value;
}
item = item->next;
}
map->miss_count++;
return 0;
}
//---------------------------------
// font cache
static unsigned font_desc_hash(void *buf, size_t len)
{
ASS_FontDesc *desc = buf;
unsigned hval;
hval = fnv_32a_str(desc->family, FNV1_32A_INIT);
hval = fnv_32a_buf(&desc->bold, sizeof(desc->bold), hval);
hval = fnv_32a_buf(&desc->italic, sizeof(desc->italic), hval);
return hval;
}
static int font_compare(void *key1, void *key2, size_t key_size)
{
ASS_FontDesc *a = key1;
ASS_FontDesc *b = key2;
if (strcmp(a->family, b->family) != 0)
return 0;
if (a->bold != b->bold)
return 0;
if (a->italic != b->italic)
return 0;
if (a->treat_family_as_pattern != b->treat_family_as_pattern)
return 0;
return 1;
}
static void font_hash_dtor(void *key, size_t key_size, void *value,
size_t value_size)
{
ass_font_free(value);
free(key);
}
ASS_Font *ass_font_cache_find(Hashmap *font_cache,
ASS_FontDesc *desc)
{
return hashmap_find(font_cache, desc);
}
/**
* \brief Add a face struct to cache.
* \param font font struct
*/
void *ass_font_cache_add(Hashmap *font_cache, ASS_Font *font)
{
return hashmap_insert(font_cache, &(font->desc), font);
}
Hashmap *ass_font_cache_init(ASS_Library *library)
{
Hashmap *font_cache;
font_cache = hashmap_init(library, sizeof(ASS_FontDesc),
sizeof(ASS_Font),
1000,
font_hash_dtor, font_compare, font_desc_hash);
return font_cache;
}
void ass_font_cache_done(Hashmap *font_cache)
{
hashmap_done(font_cache);
}
// Create hash/compare functions for bitmap and glyph
#define CREATE_HASH_FUNCTIONS
#include "ass_cache_template.h"
#define CREATE_COMPARISON_FUNCTIONS
#include "ass_cache_template.h"
//---------------------------------
// bitmap cache
static void bitmap_hash_dtor(void *key, size_t key_size, void *value,
size_t value_size)
{
BitmapHashValue *v = value;
if (v->bm)
ass_free_bitmap(v->bm);
if (v->bm_o)
ass_free_bitmap(v->bm_o);
if (v->bm_s)
ass_free_bitmap(v->bm_s);
free(key);
free(value);
}
void *cache_add_bitmap(Hashmap *bitmap_cache, BitmapHashKey *key,
BitmapHashValue *val)
{
// Note: this is only an approximation
if (val->bm_o)
bitmap_cache->cache_size += val->bm_o->w * val->bm_o->h * 3;
else if (val->bm)
bitmap_cache->cache_size += val->bm->w * val->bm->h * 3;
return hashmap_insert(bitmap_cache, key, val);
}
/**
* \brief Get a bitmap from bitmap cache.
* \param key hash key
* \return requested hash val or 0 if not found
*/
BitmapHashValue *cache_find_bitmap(Hashmap *bitmap_cache,
BitmapHashKey *key)
{
return hashmap_find(bitmap_cache, key);
}
Hashmap *ass_bitmap_cache_init(ASS_Library *library)
{
Hashmap *bitmap_cache;
bitmap_cache = hashmap_init(library,
sizeof(BitmapHashKey),
sizeof(BitmapHashValue),
0xFFFF + 13,
bitmap_hash_dtor, bitmap_compare,
bitmap_hash);
return bitmap_cache;
}
void ass_bitmap_cache_done(Hashmap *bitmap_cache)
{
hashmap_done(bitmap_cache);
}
Hashmap *ass_bitmap_cache_reset(Hashmap *bitmap_cache)
{
ASS_Library *lib = bitmap_cache->library;
ass_bitmap_cache_done(bitmap_cache);
return ass_bitmap_cache_init(lib);
}
//---------------------------------
// glyph cache
static void glyph_hash_dtor(void *key, size_t key_size, void *value,
size_t value_size)
{
GlyphHashValue *v = value;
if (v->glyph)
FT_Done_Glyph(v->glyph);
if (v->outline_glyph)
FT_Done_Glyph(v->outline_glyph);
free(key);
free(value);
}
void *cache_add_glyph(Hashmap *glyph_cache, GlyphHashKey *key,
GlyphHashValue *val)
{
return hashmap_insert(glyph_cache, key, val);
}
/**
* \brief Get a glyph from glyph cache.
* \param key hash key
* \return requested hash val or 0 if not found
*/
GlyphHashValue *cache_find_glyph(Hashmap *glyph_cache,
GlyphHashKey *key)
{
return hashmap_find(glyph_cache, key);
}
Hashmap *ass_glyph_cache_init(ASS_Library *library)
{
Hashmap *glyph_cache;
glyph_cache = hashmap_init(library, sizeof(GlyphHashKey),
sizeof(GlyphHashValue),
0xFFFF + 13,
glyph_hash_dtor, glyph_compare, glyph_hash);
return glyph_cache;
}
void ass_glyph_cache_done(Hashmap *glyph_cache)
{
hashmap_done(glyph_cache);
}
Hashmap *ass_glyph_cache_reset(Hashmap *glyph_cache)
{
ASS_Library *lib = glyph_cache->library;
ass_glyph_cache_done(glyph_cache);
return ass_glyph_cache_init(lib);
}
//---------------------------------
// composite cache
static void composite_hash_dtor(void *key, size_t key_size, void *value,
size_t value_size)
{
CompositeHashValue *v = value;
free(v->a);
free(v->b);
free(key);
free(value);
}
void *cache_add_composite(Hashmap *composite_cache,
CompositeHashKey *key,
CompositeHashValue *val)
{
return hashmap_insert(composite_cache, key, val);
}
/**
* \brief Get a composite bitmap from composite cache.
* \param key hash key
* \return requested hash val or 0 if not found
*/
CompositeHashValue *cache_find_composite(Hashmap *composite_cache,
CompositeHashKey *key)
{
return hashmap_find(composite_cache, key);
}
Hashmap *ass_composite_cache_init(ASS_Library *library)
{
Hashmap *composite_cache;
composite_cache = hashmap_init(library, sizeof(CompositeHashKey),
sizeof(CompositeHashValue),
0xFFFF + 13,
composite_hash_dtor, composite_compare,
composite_hash);
return composite_cache;
}
void ass_composite_cache_done(Hashmap *composite_cache)
{
hashmap_done(composite_cache);
}
Hashmap *ass_composite_cache_reset(Hashmap *composite_cache)
{
ASS_Library *lib = composite_cache->library;
ass_composite_cache_done(composite_cache);
return ass_composite_cache_init(lib);
}
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