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https://github.com/koreader/koreader.git
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d96666f4b1
in order to use the tile cache for variable zoomed tiles, we need more flexibility. thus, now cache tiles are hashed (well, in fact it's a concatenation) of their metadata. also, we close pages right after opening them - there was no re-use before and now we have opening and closing at one place. this should also make it easier for the garbage collector.
52 lines
1.4 KiB
Lua
Executable File
52 lines
1.4 KiB
Lua
Executable File
--[[
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a cache for rendered tiles
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]]--
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cache_max_memsize = 1024*1024*5 -- 5MB tile cache
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cache_current_memsize = 0
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cache = {}
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cache_max_age = 20
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function cacheclaim(size)
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if(size > cache_max_memsize) then
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error("too much memory claimed")
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return false
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end
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repeat
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for k, v in pairs(cache) do
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if v.age > 0 then
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print("aging slot="..k)
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v.age = v.age - 1
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else
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cache_current_memsize = cache_current_memsize - v.size
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cache[k] = nil
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break -- out of for loop
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end
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end
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until cache_current_memsize + size <= cache_max_memsize
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cache_current_memsize = cache_current_memsize + size
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print("cleaned cache to fit new tile (size="..size..")")
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return true
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end
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function draworcache(no, zoom, offset_x, offset_y, width, height, gamma)
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local hash = cachehash(no, zoom, offset_x, offset_y, width, height, gamma)
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if cache[hash] == nil then
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cacheclaim(width * height / 2);
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cache[hash] = {
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age = cache_max_age,
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size = width * height / 2,
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bb = blitbuffer.new(width, height)
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}
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print("drawing page="..no.." to slot="..hash)
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local page = doc:openPage(no)
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local dc = setzoom(page, hash)
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page:draw(dc, cache[hash].bb, 0, 0)
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page:close()
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end
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return hash
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end
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function cachehash(no, zoom, offset_x, offset_y, width, height, gamma)
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return no..'_'..zoom..'_'..offset_x..','..offset_y..'-'..width..'x'..height..'_'..gamma;
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end
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function clearcache()
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cache = {}
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end
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