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#include "config.h"
#include <ft2build.h>
#include FT_FREETYPE_H
#include <assert.h>
#include "mp_msg.h"
#include "ass_fontconfig.h"
#include "ass_cache.h"
typedef struct face_cache_item_s {
face_desc_t desc;
char* path;
int index;
FT_Face face;
} face_cache_item_t;
#define MAX_FACE_CACHE_SIZE 100
static face_cache_item_t* face_cache;
static int face_cache_size;
extern int no_more_font_messages;
static int font_compare(face_desc_t* a, face_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 object, either from cache or created through FreeType+FontConfig.
* \param library FreeType library object
* \param fontconfig_priv fontconfig private data
* \param desc required face description
* \param face out: the face object
*/
int ass_new_face(FT_Library library, void* fontconfig_priv, face_desc_t* desc, /*out*/ FT_Face* face)
{
FT_Error error;
int i;
char* path;
int index;
face_cache_item_t* item;
for (i=0; i<face_cache_size; ++i)
if (font_compare(desc, &(face_cache[i].desc))) {
*face = face_cache[i].face;
return 0;
}
if (face_cache_size == MAX_FACE_CACHE_SIZE) {
mp_msg(MSGT_GLOBAL, MSGL_FATAL, "Too many fonts\n");
return 1;
}
path = fontconfig_select(fontconfig_priv, desc->family, desc->bold, desc->italic, &index);
error = FT_New_Face(library, path, index, face);
if (error) {
if (!no_more_font_messages)
mp_msg(MSGT_GLOBAL, MSGL_WARN, "Error opening font: %s, %d\n", path, index);
no_more_font_messages = 1;
return 1;
}
item = face_cache + face_cache_size;
item->path = strdup(path);
item->index = index;
item->face = *face;
memcpy(&(item->desc), desc, sizeof(face_desc_t));
face_cache_size++;
return 0;
}
void ass_face_cache_init(void)
{
face_cache = calloc(MAX_FACE_CACHE_SIZE, sizeof(face_cache_item_t));
face_cache_size = 0;
}
void ass_face_cache_done(void)
{
int i;
for (i = 0; i < face_cache_size; ++i) {
face_cache_item_t* item = face_cache + i;
if (item->face) FT_Done_Face(item->face);
if (item->path) free(item->path);
// FIXME: free desc ?
}
free(face_cache);
face_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;
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.glyph) FT_Done_Glyph(item->val.glyph);
if (item->val.outline_glyph) FT_Done_Glyph(item->val.outline_glyph);
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();
}
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