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fonts: Do not unload completely on USB.

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The font engine can now perform cache lookups even if the font file is
closed, if the font was disabled with the new font_disable_all() function.
It is highly probable that the lookup succeeds but in the cache-miss case
a blank, full-width glyph will be returned.

Change-Id: I3c97e747d2a0ba30c7b495c6118c9f029d265b56
This commit is contained in:
Thomas Martitz 2014-01-15 13:37:40 +01:00
parent 84c7d6133b
commit c23ce62829
4 changed files with 123 additions and 13 deletions
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3
firmware/font_cache.c
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@ -125,6 +125,7 @@ static int search(struct font_cache* fcache,
struct font_cache_entry* font_cache_get(
struct font_cache* fcache,
unsigned short char_code,
bool cache_only,
void (*callback) (struct font_cache_entry* p, void *callback_data),
void *callback_data)
{
@ -166,6 +167,8 @@ struct font_cache_entry* font_cache_get(
}
/* not found */
if (cache_only)
return NULL;
/* find index to replace */
short lru_handle_to_replace = fcache->_lru._head;