mpv/libass/ass_cache.c

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// -*- c-basic-offset: 8; indent-tabs-mode: t -*-
// vim:ts=8:sw=8:noet:ai:
/*
Copyright (C) 2006 Evgeniy Stepanov <eugeni.stepanov@gmail.com>
This program 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.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#include <ft2build.h>
#include FT_FREETYPE_H
#include FT_GLYPH_H
#include <assert.h>
#include "mputils.h"
#include "ass_fontconfig.h"
#include "ass_font.h"
#include "ass_bitmap.h"
#include "ass_cache.h"
#define MAX_FONT_CACHE_SIZE 100
static ass_font_t** font_cache;
static int font_cache_size;
static int font_compare(ass_font_desc_t* a, ass_font_desc_t* b) {
if (strcmp(a->family, b->family) != 0)
return 0;
if (a->bold != b->bold)
return 0;
if (a->italic != b->italic)
return 0;
return 1;
}
/**
* \brief Get a face struct from cache.
* \param desc required face description
* \return font struct
*/
ass_font_t* ass_font_cache_find(ass_font_desc_t* desc)
{
int i;
for (i=0; i<font_cache_size; ++i)
if (font_compare(desc, &(font_cache[i]->desc)))
return font_cache[i];
return 0;
}
/**
* \brief Add a face struct to cache.
* \param font font struct
*/
void ass_font_cache_add(ass_font_t* font)
{
if (font_cache_size == MAX_FONT_CACHE_SIZE) {
mp_msg(MSGT_ASS, MSGL_FATAL, MSGTR_LIBASS_TooManyFonts);
// FIXME: possible memory leak
return;
}
font_cache[font_cache_size] = font;
font_cache_size++;
}
void ass_font_cache_init(void)
{
font_cache = calloc(MAX_FONT_CACHE_SIZE, sizeof(ass_font_t*));
font_cache_size = 0;
}
void ass_font_cache_done(void)
{
int i;
for (i = 0; i < font_cache_size; ++i) {
ass_font_t* item = font_cache[i];
ass_font_free(item);
}
free(font_cache);
font_cache_size = 0;
}
//---------------------------------
// glyph cache
#define GLYPH_HASH_SIZE (0xFFFF + 13)
typedef struct glyph_hash_item_s {
glyph_hash_key_t key;
glyph_hash_val_t val;
struct glyph_hash_item_s* next;
} glyph_hash_item_t;
typedef glyph_hash_item_t* glyph_hash_item_p;
static glyph_hash_item_p* glyph_hash_root;
static int glyph_hash_size;
static int glyph_compare(glyph_hash_key_t* a, glyph_hash_key_t* b) {
if (memcmp(a, b, sizeof(glyph_hash_key_t)) == 0)
return 1;
else
return 0;
}
static unsigned glyph_hash(glyph_hash_key_t* key) {
unsigned val = 0;
unsigned i;
for (i = 0; i < sizeof(key->face); ++i)
val += *(unsigned char *)(&(key->face) + i);
val <<= 21;
if (key->bitmap) val &= 0x80000000;
if (key->be) val &= 0x40000000;
val += key->index;
val += key->size << 8;
val += key->outline << 3;
val += key->advance.x << 10;
val += key->advance.y << 16;
val += key->bold << 1;
val += key->italic << 20;
return val;
}
/**
* \brief Add a glyph to glyph cache.
* \param key hash key
* \param val hash val: 2 bitmap glyphs + some additional info
*/
void cache_add_glyph(glyph_hash_key_t* key, glyph_hash_val_t* val)
{
unsigned hash = glyph_hash(key);
glyph_hash_item_t** next = glyph_hash_root + (hash % GLYPH_HASH_SIZE);
while (*next) {
if (glyph_compare(key, &((*next)->key)))
return;
next = &((*next)->next);
assert(next);
}
(*next) = malloc(sizeof(glyph_hash_item_t));
// (*next)->desc = glyph_key_copy(key, &((*next)->key));
memcpy(&((*next)->key), key, sizeof(glyph_hash_key_t));
memcpy(&((*next)->val), val, sizeof(glyph_hash_val_t));
(*next)->next = 0;
glyph_hash_size ++;
/* if (glyph_hash_size && (glyph_hash_size % 25 == 0)) {
printf("\nGlyph cache: %d entries, %d bytes\n", glyph_hash_size, glyph_hash_size * sizeof(glyph_hash_item_t));
} */
}
/**
* \brief Get a glyph from glyph cache.
* \param key hash key
* \return requested hash val or 0 if not found
*/
glyph_hash_val_t* cache_find_glyph(glyph_hash_key_t* key)
{
unsigned hash = glyph_hash(key);
glyph_hash_item_t* item = glyph_hash_root[hash % GLYPH_HASH_SIZE];
while (item) {
if (glyph_compare(key, &(item->key))) {
return &(item->val);
}
item = item->next;
}
return 0;
}
void ass_glyph_cache_init(void)
{
glyph_hash_root = calloc(GLYPH_HASH_SIZE, sizeof(glyph_hash_item_p));
glyph_hash_size = 0;
}
void ass_glyph_cache_done(void)
{
int i;
for (i = 0; i < GLYPH_HASH_SIZE; ++i) {
glyph_hash_item_t* item = glyph_hash_root[i];
while (item) {
glyph_hash_item_t* next = item->next;
if (item->val.bm) ass_free_bitmap(item->val.bm);
if (item->val.bm_o) ass_free_bitmap(item->val.bm_o);
if (item->val.bm_s) ass_free_bitmap(item->val.bm_s);
free(item);
item = next;
}
}
free(glyph_hash_root);
glyph_hash_size = 0;
}
void ass_glyph_cache_reset(void)
{
ass_glyph_cache_done();
ass_glyph_cache_init();
}