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local Blitbuffer = require("ffi/blitbuffer")
local CacheItem = require("cacheitem")
local Persist = require("persist")
local logger = require("logger")
local TileCacheItem = CacheItem:new{}
function TileCacheItem:onFree()
if self.bb.free then
logger.dbg("free blitbuffer", self.bb)
self.bb:free()
end
end
--- @note: Perhaps one day we'll be able to teach bitser or string.buffer about custom structs with pointers to buffers,
--- so we won't have to do the BB tostring/fromstring dance anymore...
function TileCacheItem:totable()
local t = {
size = self.size,
pageno = self.pageno,
excerpt = self.excerpt,
persistent = self.persistent,
bb = {
w = self.bb.w,
h = self.bb.h,
stride = tonumber(self.bb.stride),
fmt = self.bb:getType(),
data = Blitbuffer.tostring(self.bb),
},
}
return t
end
function TileCacheItem:dump(filename)
logger.dbg("Dumping tile cache to", filename, self.excerpt)
local cache_file = Persist:new{
path = filename,
codec = "zstd",
}
local ok, size = cache_file:save(self:totable())
if ok then
return size
else
logger.warn("Failed to dump tile cache")
return nil
end
end
function TileCacheItem:fromtable(t)
self.size = t.size
self.pageno = t.pageno
self.excerpt = t.excerpt
self.persistent = t.persistent
self.bb = Blitbuffer.fromstring(t.bb.w, t.bb.h, t.bb.fmt, t.bb.data, t.bb.stride)
end
function TileCacheItem:load(filename)
local cache_file = Persist:new{
path = filename,
codec = "zstd",
}
local t = cache_file:load(filename)
if t then
self:fromtable(t)
logger.dbg("Loaded tile cache from", filename, self)
else
logger.warn("Failed to load tile cache from", filename)
end
end
return TileCacheItem