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52 lines
1.4 KiB
Lua
52 lines
1.4 KiB
Lua
--[[
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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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