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font: cache loaded fonts globally

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Each font instance has a ref-counter. Whenever we want to instantiate
a font that has already been loaded, we instead return the
already-loaded instance, and bump the ref counter.

When the last font instance is destroyed, it is also removed from the
cache.
This commit is contained in:
Daniel Eklöf 2019-11-01 20:40:42 +01:00
parent 3032ac33da
commit 43462b24f3
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GPG key ID: 5BBD4992C116573F
1 changed files with 52 additions and 0 deletions
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52
font.c
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@ -22,6 +22,13 @@ static mtx_t ft_lock;
static const size_t cache_size = 512;
struct font_cache_entry {
uint64_t hash;
struct font *font;
};
static tll(struct font_cache_entry) font_cache = tll_init();
static void __attribute__((constructor))
init(void)
{
@ -33,6 +40,9 @@ init(void)
static void __attribute__((destructor))
fini(void)
{
while (tll_length(font_cache) > 0)
font_destroy(tll_front(font_cache).font);
mtx_destroy(&ft_lock);
FT_Done_FreeType(ft_lib);
FcFini();
@ -275,12 +285,46 @@ from_name(const char *name, bool is_fallback)
return font;
}
static uint64_t
sdbm_hash(const char *s)
{
uint64_t hash = 0;
for (; *s != '\0'; s++) {
int c = *s;
hash = c + (hash << 6) + (hash << 16) - hash;
}
return hash;
}
static uint64_t
font_hash(font_list_t names, const char *attributes)
{
uint64_t hash = 0;
tll_foreach(names, it)
hash ^= sdbm_hash(it->item);
if (attributes != NULL)
hash ^= sdbm_hash(attributes);
return hash;
}
struct font *
font_from_name(font_list_t names, const char *attributes)
{
if (tll_length(names) == 0)
return false;
uint64_t hash = font_hash(names, attributes);
tll_foreach(font_cache, it) {
if (it->item.hash == hash) {
it->item.font->ref_counter++;
return it->item.font;
}
}
struct font *font = NULL;
bool have_attrs = attributes != NULL && strlen(attributes) > 0;
@ -312,6 +356,7 @@ font_from_name(font_list_t names, const char *attributes)
font->fallbacks, ((struct font_fallback){.pattern = strdup(name)}));
}
tll_push_back(font_cache, ((struct font_cache_entry){.hash = hash, .font = font}));
return font;
}
@ -605,6 +650,13 @@ font_destroy(struct font *font)
if (--font->ref_counter > 0)
return;
tll_foreach(font_cache, it) {
if (it->item.font == font) {
tll_remove(font_cache, it);
break;
}
}
free(font->name);
tll_foreach(font->fallbacks, it) {