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https://github.com/koreader/koreader
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a025863f54
* TileCache: Preserve BlitBuffer's inversion & rotation This somehow fell through the cracks for all these years ;). (We can't simply save the config field directly, because bb.fromstring always generates an allocated bb, which may not be the case of the source bb). * Bump base https://github.com/koreader/koreader-base/pull/1440
79 lines
2.1 KiB
Lua
79 lines
2.1 KiB
Lua
local Blitbuffer = require("ffi/blitbuffer")
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local CacheItem = require("cacheitem")
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local Persist = require("persist")
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local logger = require("logger")
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local TileCacheItem = CacheItem:new{}
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function TileCacheItem:onFree()
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logger.dbg("TileCacheItem: free blitbuffer", self.bb)
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self.bb:free()
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end
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--- @note: Perhaps one day we'll be able to teach bitser or string.buffer about custom structs with pointers to buffers,
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--- so we won't have to do the BB tostring/fromstring dance anymore...
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function TileCacheItem:totable()
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local t = {
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size = self.size,
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pageno = self.pageno,
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excerpt = self.excerpt,
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created_ts = self.created_ts,
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persistent = self.persistent,
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bb = {
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w = self.bb.w,
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h = self.bb.h,
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stride = tonumber(self.bb.stride),
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fmt = self.bb:getType(),
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rotation = self.bb:getRotation(),
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inverse = self.bb:getInverse(),
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data = Blitbuffer.tostring(self.bb),
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},
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}
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return t
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end
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function TileCacheItem:dump(filename)
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logger.dbg("Dumping tile cache to", filename, self.excerpt)
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local cache_file = Persist:new{
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path = filename,
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codec = "zstd",
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}
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local ok, size = cache_file:save(self:totable())
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if ok then
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return size
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else
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logger.warn("Failed to dump tile cache")
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return nil
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end
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end
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function TileCacheItem:fromtable(t)
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self.size = t.size
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self.pageno = t.pageno
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self.excerpt = t.excerpt
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self.created_ts = t.created_ts
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self.persistent = t.persistent
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self.bb = Blitbuffer.fromstring(t.bb.w, t.bb.h, t.bb.fmt, t.bb.data, t.bb.stride, t.bb.rotation, t.bb.inverse)
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end
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function TileCacheItem:load(filename)
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local cache_file = Persist:new{
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path = filename,
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codec = "zstd",
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}
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local t = cache_file:load(filename)
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if t then
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self:fromtable(t)
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logger.dbg("Loaded tile cache from", filename, self)
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else
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logger.warn("Failed to load tile cache from", filename)
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end
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end
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return TileCacheItem
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