reactivate FFI blitbuffer module

This should fix #274 and #288.

frontend/ui/image.lua

@@ -1,25 +0,0 @@
-Image = {}
-
-function Image._getFileData(filename)
-	local f = io.open(filename)
-	local data = f:read("*a")
-	f:close()
-	return data
-end
-
-function Image.fromPNG(filename)
-	local img = mupdfimg.new()
-	img:loadPNGData(Image._getFileData(filename))
-	local bb = img:toBlitBuffer()
-	img:free()
-	return bb
-end
-
-function Image.fromJPEG(filename)
-	local img = mupdfimg.new()
-	img:loadJPEGData(Image._getFileData(filename))
-	local bb = img:toBlitBuffer()
-	img:free()
-	return bb
-end
-

frontend/ui/widget/base.lua

@@ -1,7 +1,6 @@
 require "ui/screen"
 require "ui/rendertext"
 require "ui/graphics"
-require "ui/image"
 require "ui/event"
 require "ui/gesturedetector"
 require "ui/font"

frontend/ui/widget/image.lua

@@ -1,5 +1,5 @@
 require "ui/widget/base"
-require "ui/image"
+--require "ui/image"
 
 
 --[[
@@ -16,9 +16,9 @@ ImageWidget = Widget:new{
 function ImageWidget:_render()
 	local itype = string.lower(string.match(self.file, ".+%.([^.]+)") or "")
 	if itype == "jpeg" or itype == "jpg" then
-		self._bb = Image.fromJPEG(self.file)
+		self._bb = Image:fromJPEG(self.file)
 	elseif itype == "png" then
-		self._bb = Image.fromPNG(self.file)
+		self._bb = Image:fromPNG(self.file)
 	end
 end