diff --git a/frontend/apps/filemanager/filemanager.lua b/frontend/apps/filemanager/filemanager.lua
index e87e0f241..21554c366 100644
--- a/frontend/apps/filemanager/filemanager.lua
+++ b/frontend/apps/filemanager/filemanager.lua
@@ -8,6 +8,7 @@ local FileChooser = require("ui/widget/filechooser")
 local VerticalSpan = require("ui/widget/verticalspan")
 local VerticalGroup = require("ui/widget/verticalgroup")
 local ButtonDialog = require("ui/widget/buttondialog")
+local lfs = require("libs/libkoreader-lfs")
 local UIManager = require("ui/uimanager")
 local Font = require("ui/font")
 local Screen = require("ui/screen")
diff --git a/frontend/apps/filemanager/filemanagerhistory.lua b/frontend/apps/filemanager/filemanagerhistory.lua
index a9dae76e8..0e3c031f6 100644
--- a/frontend/apps/filemanager/filemanagerhistory.lua
+++ b/frontend/apps/filemanager/filemanagerhistory.lua
@@ -1,10 +1,11 @@
 local InputContainer = require("ui/widget/container/inputcontainer")
 local CenterContainer = require("ui/widget/container/centercontainer")
-local Menu = require("ui/widget/menu")
 local ButtonDialog = require("ui/widget/buttondialog")
-local Screen = require("ui/screen")
+local lfs = require("libs/libkoreader-lfs")
 local UIManager = require("ui/uimanager")
 local DocSettings = require("docsettings")
+local Menu = require("ui/widget/menu")
+local Screen = require("ui/screen")
 local DEBUG = require("dbg")
 local _ = require("gettext")
 
diff --git a/frontend/apps/filemanager/filemanagersearch.lua b/frontend/apps/filemanager/filemanagersearch.lua
index 9a9de5860..820f471bb 100644
--- a/frontend/apps/filemanager/filemanagersearch.lua
+++ b/frontend/apps/filemanager/filemanagersearch.lua
@@ -1,11 +1,12 @@
-local InfoMessage = require("ui/widget/infomessage")
-local UIManager = require("ui/uimanager")
-local _ = require("gettext")
+local CenterContainer = require("ui/widget/container/centercontainer")
 local InputContainer = require("ui/widget/container/inputcontainer")
 local InputDialog = require("ui/widget/inputdialog")
-local CenterContainer = require("ui/widget/container/centercontainer")
-local Screen = require("ui/screen")
+local InfoMessage = require("ui/widget/infomessage")
+local lfs = require("libs/libkoreader-lfs")
+local UIManager = require("ui/uimanager")
 local Menu = require("ui/widget/menu")
+local Screen = require("ui/screen")
+local _ = require("gettext")
 
 local Search = InputContainer:new{
     calibrefile = nil,
@@ -72,7 +73,7 @@ function Search:init()
     self.results = {}
 
     -- check if we find the calibre file
-    if LIBRARY_PATH == nil then 
+    if LIBRARY_PATH == nil then
           self.calibrefile = findcalibre("/mnt")
           if not self.calibrefile then
               error = "LIBRARY_PATH in DEFAULTS.LUA is not set!"
@@ -100,7 +101,7 @@ function Search:init()
             self.calibrefile = findcalibre("/mnt")
         end
     end
-    
+
     if self.calibrefile ~= nil then
         LIBRARY_PATH = string.gsub(self.calibrefile,"/[^/]*$","")
         if string.sub(LIBRARY_PATH,string.len(LIBRARY_PATH)) ~= "/" then
@@ -197,7 +198,7 @@ function Search:find()
     else
         upsearch = string.upper(self.search_value)
     end
-    
+
     self.data[i] = {"-","-","-","-","-","-","-","-"}
     while line do
         if line == "  }, " or line == "  }" then
diff --git a/frontend/apps/reader/modules/readertypeset.lua b/frontend/apps/reader/modules/readertypeset.lua
index e5649526a..4d172eaf3 100644
--- a/frontend/apps/reader/modules/readertypeset.lua
+++ b/frontend/apps/reader/modules/readertypeset.lua
@@ -1,11 +1,11 @@
 local InputContainer = require("ui/widget/container/inputcontainer")
 local ConfirmBox = require("ui/widget/confirmbox")
+local lfs = require("libs/libkoreader-lfs")
 local UIManager = require("ui/uimanager")
 local Screen = require("ui/screen")
 local Event = require("ui/event")
 local DEBUG = require("dbg")
 local _ = require("gettext")
--- lfs
 
 local ReaderTypeset = InputContainer:new{
     css_menu_title = _("Set render style"),
diff --git a/frontend/apps/reader/pluginloader.lua b/frontend/apps/reader/pluginloader.lua
index ef26ce20d..788964f9e 100644
--- a/frontend/apps/reader/pluginloader.lua
+++ b/frontend/apps/reader/pluginloader.lua
@@ -1,5 +1,5 @@
+local lfs = require("libs/libkoreader-lfs")
 local DEBUG = require("dbg")
--- lfs
 
 local PluginLoader = {
     plugin_path = "plugins"
diff --git a/frontend/cache.lua b/frontend/cache.lua
index 3d4627f97..60f1bc826 100644
--- a/frontend/cache.lua
+++ b/frontend/cache.lua
@@ -2,6 +2,7 @@
 A global LRU cache
 ]]--
 require("MD5")
+local lfs = require("libs/libkoreader-lfs")
 local DEBUG = require("dbg")
 
 local function calcFreeMem()
diff --git a/frontend/docsettings.lua b/frontend/docsettings.lua
index e094712d0..1c3e7f204 100644
--- a/frontend/docsettings.lua
+++ b/frontend/docsettings.lua
@@ -1,5 +1,5 @@
+local lfs = require("libs/libkoreader-lfs")
 local DocSettings = {}
--- lfs
 
 function DocSettings:getHistoryPath(fullpath)
     local i = #fullpath - 1
diff --git a/frontend/document/credocument.lua b/frontend/document/credocument.lua
index 9020859bb..b840041d7 100644
--- a/frontend/document/credocument.lua
+++ b/frontend/document/credocument.lua
@@ -1,14 +1,13 @@
-local Geom = require("ui/geometry")
-local Blitbuffer = require("ffi/blitbuffer")
 local CreOptions = require("ui/data/creoptions")
 local Document = require("document/document")
+local Configurable = require("configurable")
+local Blitbuffer = require("ffi/blitbuffer")
+local lfs = require("libs/libkoreader-lfs")
 local Geom = require("ui/geometry")
-local Font = require("ui/font")
 local Device = require("ui/device")
 local Screen = require("ui/screen")
+local Font = require("ui/font")
 local DEBUG = require("dbg")
-local Configurable = require("configurable")
--- TBD: DrawContext
 
 local CreDocument = Document:new{
     -- this is defined in kpvcrlib/crengine/crengine/include/lvdocview.h
diff --git a/frontend/ui/device.lua b/frontend/ui/device.lua
index 1d83717ed..b4ee97d52 100644
--- a/frontend/ui/device.lua
+++ b/frontend/ui/device.lua
@@ -1,12 +1,12 @@
 local AndroidPowerd = require("ui/device/androidpowerd")
 local KindlePowerD = require("ui/device/kindlepowerd")
+local isAndroid, android = pcall(require, "android")
 local KoboPowerD = require("ui/device/kobopowerd")
 local BasePowerD = require("ui/device/basepowerd")
+local lfs = require("libs/libkoreader-lfs")
 local Screen = require("ui/device/screen")
 local util = require("ffi/util")
 local ffi = require("ffi")
-local isAndroid, android = pcall(require, "android")
--- lfs
 
 local Device = {
     screen_saver_mode = false,
diff --git a/frontend/ui/device/screen.lua b/frontend/ui/device/screen.lua
index dcbfca859..e3a0c36d5 100644
--- a/frontend/ui/device/screen.lua
+++ b/frontend/ui/device/screen.lua
@@ -1,12 +1,10 @@
 local Blitbuffer = require("ffi/blitbuffer")
+local einkfb = require("ffi/framebuffer")
 local Geom = require("ui/geometry")
 local util = require("ffi/util")
 local DEBUG = require("dbg")
 local _ = require("gettext")
 
--- Blitbuffer
--- einkfb
-
 --[[
 Codes for rotation modes:
 
diff --git a/frontend/ui/font.lua b/frontend/ui/font.lua
index b714c7d3b..e218fd1f4 100644
--- a/frontend/ui/font.lua
+++ b/frontend/ui/font.lua
@@ -1,3 +1,5 @@
+local lfs = require("libs/libkoreader-lfs")
+local Freetype = require("ffi/freetype")
 local Screen = require("ui/screen")
 local DEBUG = require("dbg")
 
@@ -62,7 +64,7 @@ function Font:getFace(font, size)
             realname = font
         end
         realname = self.fontdir.."/"..realname
-        ok, face = pcall(freetype.newFace, realname, size)
+        ok, face = pcall(Freetype.newFace, realname, size)
         if not ok then
             DEBUG("#! Font "..font.." ("..realname..") not supported: "..face)
             return nil
diff --git a/frontend/ui/input.lua b/frontend/ui/input.lua
index 0dc7108e7..d558e43bd 100644
--- a/frontend/ui/input.lua
+++ b/frontend/ui/input.lua
@@ -3,11 +3,12 @@ local GestureDetector = require("ui/gesturedetector")
 local Event = require("ui/event")
 local TimeVal = require("ui/timeval")
 local Screen = require("ui/screen")
+local input = require("ffi/input")
+local util = require("ffi/util")
 local Math = require("optmath")
 local DEBUG = require("dbg")
-local _ = require("gettext")
 local ffi = require("ffi")
-local util = require("ffi/util")
+local _ = require("gettext")
 
 -- constants from <linux/input.h>
 local EV_SYN = 0
diff --git a/frontend/ui/widget/filechooser.lua b/frontend/ui/widget/filechooser.lua
index 4c305cc39..2df87d59e 100644
--- a/frontend/ui/widget/filechooser.lua
+++ b/frontend/ui/widget/filechooser.lua
@@ -1,9 +1,9 @@
+local lfs = require("libs/libkoreader-lfs")
 local Menu = require("ui/widget/menu")
 local Screen = require("ui/screen")
 local UIManager = require("ui/uimanager")
 local DEBUG = require("dbg")
 local util = require("ffi/util")
--- lfs
 local ffi = require("ffi")
 ffi.cdef[[
 int strcoll (char *str1, char *str2);
diff --git a/frontend/ui/widget/imagewidget.lua b/frontend/ui/widget/imagewidget.lua
index 5f42aa28d..37e302229 100644
--- a/frontend/ui/widget/imagewidget.lua
+++ b/frontend/ui/widget/imagewidget.lua
@@ -1,6 +1,6 @@
 local Widget = require("ui/widget/widget")
+local Image = require("ffi/mupdfimg")
 local Geom = require("ui/geometry")
--- Image
 
 --[[
 ImageWidget shows an image from a file
@@ -10,6 +10,9 @@ local ImageWidget = Widget:new{
     invert = nil,
     dim = nil,
     hide = nil,
+    -- if width or height is given, image will rescale to the given size
+    width = nil,
+    height = nil,
     _bb = nil
 }
 
@@ -20,6 +23,10 @@ function ImageWidget:_render()
     elseif itype == "png" then
         self._bb = Image:fromPNG(self.file)
     end
+    local w, h = self._bb:getWidth(), self._bb:getHeight()
+    if (self.width and self.width ~= w) or (self.height and self.height ~= h) then
+        self._bb = self._bb:scale(self.width or w, self.height or h)
+    end
 end
 
 function ImageWidget:getSize()
@@ -29,12 +36,19 @@ function ImageWidget:getSize()
     return Geom:new{ w = self._bb:getWidth(), h = self._bb:getHeight() }
 end
 
+function ImageWidget:rotate(degree)
+    if not self._bb then
+        self:_render()
+    end
+    self._bb:rotate(degree)
+end
+
 function ImageWidget:paintTo(bb, x, y)
     local size = self:getSize()
     self.dimen = Geom:new{
         x = x, y = y,
         w = size.w,
-        h = size.h 
+        h = size.h
     }
     if self.hide then return end
     bb:blitFrom(self._bb, x, y, 0, 0, size.w, size.h)
diff --git a/reader.lua b/reader.lua
index a1f239359..19c58ecfa 100755
--- a/reader.lua
+++ b/reader.lua
@@ -1,11 +1,5 @@
 #!./koreader-base
 
-require "libs/libkoreader-lfs"
-einkfb = require("ffi/framebuffer")
-input = require("ffi/input")
-freetype = require("ffi/freetype")
-Image = require("ffi/mupdfimg")
-
 require "defaults"
 pcall(dofile, "defaults.persistent.lua")
 package.path = "?.lua;common/?.lua;frontend/?.lua"
@@ -27,14 +21,15 @@ end
 local DocumentRegistry = require("document/documentregistry")
 local FileManager = require("apps/filemanager/filemanager")
 local InfoMessage = require("ui/widget/infomessage")
+local ReaderUI = require("apps/reader/readerui")
+local lfs = require("libs/libkoreader-lfs")
 local UIManager = require("ui/uimanager")
 local Menu = require("ui/widget/menu")
 local Device = require("ui/device")
 local Screen = require("ui/screen")
+local input = require("ffi/input")
 local DEBUG = require("dbg")
 
-local ReaderUI = require("apps/reader/readerui")
-
 local Profiler = nil
 
 function exitReader()
diff --git a/wtest.lua b/wtest.lua
index 816bc0c1c..b76153fce 100755
--- a/wtest.lua
+++ b/wtest.lua
@@ -1,11 +1,5 @@
 #!./koreader-base
 
-require "libs/libkoreader-lfs"
-einkfb = require("ffi/framebuffer")
-input = require("ffi/input")
-freetype = require("ffi/freetype")
-Image = require("ffi/mupdfimg")
-
 require "defaults"
 print(package.path)
 package.path = "?.lua;common/?.lua;frontend/?.lua"
@@ -64,7 +58,7 @@ end
 
 function TestVisible:paintTo(bb)
     --Draw three lines at the borders to assess what the maximum visible coordinates are
-    
+
     v_line = math.floor(bb:getWidth() / 50)
     h_line = math.floor(bb:getHeight() / 50)
     -- Paint white background for higher contrast
@@ -78,40 +72,40 @@ function TestVisible:paintTo(bb)
         x_num = i*50
         RenderText:renderUtf8Text(bb, x_num, 40, Font:getFace("ffont", 12), x_num, true)
     end
-    
+
     -- Handtunable minimal and maximal visible coordinates
     local x_min = 0 + 4
     local x_max = bb:getWidth() - 4
     local y_min = 0 + 3
     local y_max = bb:getHeight() - 3 - 12
-    
+
     -- Render extremes on screen
     RenderText:renderUtf8Text(bb, 150, 100, Font:getFace("ffont", 22), "x_min = "..x_min, true)
     RenderText:renderUtf8Text(bb, 500, 100, Font:getFace("ffont", 22), "x_max = "..x_max, true)
     RenderText:renderUtf8Text(bb, 100, 150, Font:getFace("ffont", 22), "y_min = "..y_min, true)
     RenderText:renderUtf8Text(bb, 100, 300, Font:getFace("ffont", 22), "y_max = "..y_max, true)
     RenderText:renderUtf8Text(bb, 100, 500, Font:getFace("ffont", 26), "Visible screen size :  "..(x_max-x_min).."x"..(y_max-y_min), true)
-    
+
     -- Three parallel lines at the top
     bb:paintRect(x_min,y_min, x_max, 1 , 10)
     bb:paintRect(x_min,y_min + 3, x_max, 1 , 10)
     bb:paintRect(x_min,y_min + 6, x_max, 1 , 10)
-    
+
     -- Three parallel lines at the bottom
     bb:paintRect(x_min,y_max, x_max, 1 , 10)
     bb:paintRect(x_min,y_max - 3, x_max, 1 , 10)
     bb:paintRect(x_min,y_max - 6, x_max, 1 , 10)
-    
+
     -- Three parallel lines at the left
     bb:paintRect(x_min,y_min, 1, y_max , 10)
     bb:paintRect(x_min + 3,y_min, 1, y_max, 10)
     bb:paintRect(x_min + 6,y_min, 1, y_max, 10)
-    
+
     -- Three parallel lines at the right
     bb:paintRect(x_max,y_min, 1, y_max , 10)
     bb:paintRect(x_max - 3,y_min, 1, y_max, 10)
     bb:paintRect(x_max - 6,y_min, 1, y_max, 10)
-   
+
     --Two lines spaces 600 pixels
     bb:paintRect(100,600, 1, 250 , 10)
     bb:paintRect(700,600, 1, 250 , 10)