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65 lines
1.5 KiB
Lua
65 lines
1.5 KiB
Lua
--[[
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a cache for rendered tiles
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]]--
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function init_tilecache()
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cache = {
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{ age = 0, no = 0, bb = blitbuffer.new(width, height), dc = pdf.newDC(), page = nil },
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{ age = 0, no = 0, bb = blitbuffer.new(width, height), dc = pdf.newDC(), page = nil },
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{ age = 0, no = 0, bb = blitbuffer.new(width, height), dc = pdf.newDC(), page = nil }
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}
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end
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function freecache()
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for i = 1, #cache do
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if cache[i].page ~= nil then
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print("freeing slot="..i.." oldpage="..cache[i].no)
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cache[i].page:close()
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cache[i].page = nil
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end
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end
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end
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function checkcache(no)
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for i = 1, #cache do
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if cache[i].no == no and cache[i].page ~= nil then
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print("cache hit: slot="..i.." page="..no)
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return i
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end
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end
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print("cache miss")
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return nil
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end
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function cacheslot()
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freeslot = nil
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while freeslot == nil do
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for i = 1, #cache do
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if cache[i].age > 0 then
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print("aging slot="..i)
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cache[i].age = cache[i].age - 1
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else
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if cache[i].page ~= nil then
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print("freeing slot="..i.." oldpage="..cache[i].no)
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cache[i].page:close()
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cache[i].page = nil
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end
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freeslot = i
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end
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end
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end
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print("returning free slot="..freeslot)
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return freeslot
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end
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function draworcache(no)
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local slot = checkcache(no)
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if slot == nil then
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slot = cacheslot()
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cache[slot].no = no
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cache[slot].age = #cache
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cache[slot].page = doc:openPage(no)
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setzoom(slot)
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print("drawing page="..no.." to slot="..slot)
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cache[slot].page:draw(cache[slot].dc, cache[slot].bb, 0, 0)
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end
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return slot
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end
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