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118 lines
2.9 KiB
Lua
118 lines
2.9 KiB
Lua
local Widget = require("ui/widget/widget")
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local CacheItem = require("cacheitem")
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local Image = require("ffi/mupdfimg")
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local Geom = require("ui/geometry")
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local Cache = require("cache")
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local DEBUG = require("dbg")
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local ImageCache = Cache:new{
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max_memsize = 2*1024*1024, -- 2M of image cache
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current_memsize = 0,
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cache = {},
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-- this will hold the LRU order of the cache
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cache_order = {}
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}
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local ImageCacheItem = CacheItem:new{}
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function ImageCacheItem:onFree()
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if self.bb.free then
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DEBUG("free image blitbuffer", self.bb)
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self.bb:free()
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end
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end
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--[[
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ImageWidget shows an image from a file
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--]]
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local ImageWidget = Widget:new{
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file = nil,
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image = nil,
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invert = nil,
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dim = nil,
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hide = nil,
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-- if width or height is given, image will rescale to the given size
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width = nil,
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height = nil,
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_bb = nil
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}
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function ImageWidget:_loadimage()
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self._bb = self.image
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end
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function ImageWidget:_loadfile()
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local itype = string.lower(string.match(self.file, ".+%.([^.]+)") or "")
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if itype == "png" or itype == "jpg" or itype == "jpeg"
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or itype == "tiff" then
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local hash = "image|"..self.file.."|"..(self.width or "").."|"..(self.height or "")
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local cache = ImageCache:check(hash)
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if cache then
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-- hit cache
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self._bb = cache.bb
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else
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-- cache this image
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DEBUG("cache", hash)
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local cache = ImageCacheItem:new{
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bb = Image:fromFile(self.file, self.width, self.height),
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}
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cache.size = cache.bb.pitch * cache.bb.h
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ImageCache:insert(hash, cache)
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self._bb = cache.bb
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end
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else
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error("Image file type not supported.")
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end
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end
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function ImageWidget:_render()
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if self.image then
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self:_loadimage()
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elseif self.file then
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self:_loadfile()
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else
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error("cannot render image")
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end
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local w, h = self._bb:getWidth(), self._bb:getHeight()
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if (self.width and self.width ~= w) or (self.height and self.height ~= h) then
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self._bb = self._bb:scale(self.width or w, self.height or h)
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end
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end
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function ImageWidget:getSize()
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self:_render()
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return Geom:new{ w = self._bb:getWidth(), h = self._bb:getHeight() }
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end
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function ImageWidget:rotate(degree)
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self:_render()
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self._bb:rotate(degree)
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end
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function ImageWidget:paintTo(bb, x, y)
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if self.hide then return end
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-- self:_reader is called in getSize method
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local size = self:getSize()
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self.dimen = Geom:new{
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x = x, y = y,
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w = size.w,
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h = size.h
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}
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bb:blitFrom(self._bb, x, y, 0, 0, size.w, size.h)
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if self.invert then
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bb:invertRect(x, y, size.w, size.h)
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end
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if self.dim then
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bb:dimRect(x, y, size.w, size.h)
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end
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end
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function ImageWidget:free()
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if self.image then
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self.image:free()
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self.image = nil
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end
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end
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return ImageWidget
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