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add standalone glyph cache

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I found it will be especially helpful to cache glyph separately
so that glyph caches won't be washed out by a single page cache.
This commit is contained in:
chrox
2013-03-24 18:37:33 +08:00
parent 039eea17ae
commit 01f045e7f9
2 changed files with 19 additions and 4 deletions
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14
frontend/ui/rendertext.lua
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@@ -4,11 +4,19 @@ require "cache"
TODO: all these functions should probably be methods on Face objects
]]--
GlyphCache = Cache:new{
max_memsize = 512*1024,
current_memsize = 0,
cache = {},
-- this will hold the LRU order of the cache
cache_order = {}
}
function getGlyph(face, charcode, bgcolor, fgcolor)
if bgcolor == nil then bgcolor = 0.0 end
if fgcolor == nil then fgcolor = 1.0 end
local hash = "glyph|"..face.hash.."|"..charcode.."|"..bgcolor.."|"..fgcolor
local glyph = Cache:check(hash)
local glyph = GlyphCache:check(hash)
if glyph then
-- cache hit
return glyph[1]
@@ -20,8 +28,8 @@ function getGlyph(face, charcode, bgcolor, fgcolor)
end
glyph = CacheItem:new{rendered_glyph}
glyph.size = glyph[1].bb:getWidth() * glyph[1].bb:getHeight() / 2 + 32
Cache:insert(hash, glyph)
return glyph[1]
GlyphCache:insert(hash, glyph)
return rendered_glyph
end
function getSubTextByWidth(text, face, width, kerning)