fix #1608 with touch coordinates detection

Some kobo touch devices have X Y coordinates in touch events swapped.
This patch provides a GUI to probe if the device needs to swap the XY.
The Kobo Touch users will be directed to tap on the upper right corner
of the screen and the probe will check if the X value is smaller than
the Y value in the tap event.

Makefile

@@ -38,7 +38,7 @@ UBUNTUTOUCH_SDL_DIR:=$(UBUNTUTOUCH_DIR)/ubuntu-touch-sdl
 WIN32_DIR=$(PLATFORM_DIR)/win32
 
 # files to link from main directory
-INSTALL_FILES=reader.lua frontend resources defaults.lua datastorage.lua l10n \
+INSTALL_FILES=reader.lua frontend resources defaults.lua datastorage.lua l10n utils \
 		git-rev README.md COPYING
 
 # for gettext

reader.lua

@@ -112,7 +112,7 @@ if G_reader_settings:readSetting("night_mode") then
     Screen:toggleNightMode()
 end
 
--- restore kobo frontlight settings
+-- restore kobo frontlight settings and probe kobo touch coordinates
 if Device:isKobo() then
     local powerd = Device:getPowerDevice()
     if powerd and powerd.restore_settings then
@@ -121,6 +121,9 @@ if Device:isKobo() then
         powerd:setIntensityWithoutHW(intensity)
         -- powerd:setIntensity(intensity)
     end
+    if Device:getCodeName() == "trilogy" then
+        require("utils/kobo_touch_proble")
+    end
 end
 
 if ARGV[argidx] and ARGV[argidx] ~= "" then

utils/kobo_touch_proble.lua

@@ -0,0 +1,97 @@
+-- touch probe utility
+-- usage: ./luajit util/kobo_touch_proble.lua
+
+require "defaults"
+package.path = "common/?.lua;rocks/share/lua/5.1/?.lua;frontend/?.lua;" .. package.path
+package.cpath = "common/?.so;common/?.dll;/usr/lib/lua/?.so;rocks/lib/lua/5.1/?.so;" .. package.cpath
+
+local DocSettings = require("docsettings")
+local _ = require("gettext")
+
+-- read settings and check for language override
+-- has to be done before requiring other files because
+-- they might call gettext on load
+G_reader_settings = DocSettings:open(".reader")
+local lang_locale = G_reader_settings:readSetting("language")
+if lang_locale then
+    _.changeLang(lang_locale)
+end
+local InputContainer = require("ui/widget/container/inputcontainer")
+local CenterContainer = require("ui/widget/container/centercontainer")
+local RightContainer = require("ui/widget/container/rightcontainer")
+local OverlapGroup = require("ui/widget/overlapgroup")
+local ImageWidget = require("ui/widget/imagewidget")
+local TextWidget = require("ui/widget/textwidget")
+local GestureRange = require("ui/gesturerange")
+local UIManager = require("ui/uimanager")
+local Blitbuffer = require("ffi/blitbuffer")
+local Geom = require("ui/geometry")
+local Device = require("device")
+local Screen = require("device").screen
+local Input = require("device").input
+local Font = require("ui/font")
+local DEBUG = require("dbg")
+--DEBUG:turnOn()
+
+local TouchProbe = InputContainer:new{
+}
+
+function TouchProbe:init()
+    self.ges_events = {
+        TapProbe = {
+            GestureRange:new{
+                ges = "tap",
+                range = Geom:new{
+                    x = 0, y = 0,
+                    w = Screen:getWidth(),
+                    h = Screen:getHeight(),
+                },
+            }
+        },
+    }
+    local image_widget = ImageWidget:new{
+        file = "resources/kobo-touch-probe.png",
+    }
+    self[1] = OverlapGroup:new{
+        dimen = Screen:getSize(),
+        CenterContainer:new{
+            dimen = Screen:getSize(),
+            TextWidget:new{
+                text = _("Tap the upper right corner"),
+                face = Font:getFace("cfont", 30),
+            },
+        },
+        RightContainer:new{
+            dimen = {
+                h = image_widget:getSize().h,
+                w = Screen:getSize().w,
+            },
+            image_widget,
+        },
+    }
+end
+
+function TouchProbe:onTapProbe(arg, ges)
+    --DEBUG("onTapProbe", ges)
+    local need_to_switch_xy = ges.pos.x < ges.pos.y
+    --DEBUG("Need to switch xy", need_to_switch_xy)
+    G_reader_settings:saveSetting("kobo_touch_switch_xy", need_to_switch_xy)
+    G_reader_settings:close()
+    if need_to_switch_xy then
+        Input:registerEventAdjustHook(Input.adjustTouchSwitchXY)
+    end
+    UIManager:quit()
+end
+
+-- if user has not set KOBO_TOUCH_MIRRORED yet
+if KOBO_TOUCH_MIRRORED == nil then
+    local switch_xy = G_reader_settings:readSetting("kobo_touch_switch_xy")
+    -- and has no probe before
+    if switch_xy == nil then
+        UIManager:show(TouchProbe:new{})
+        UIManager:run()
+    -- otherwise, we will use probed result
+    else
+        KOBO_TOUCH_MIRRORED = switch_xy
+    end
+end

utils/wtest.lua

@@ -3,8 +3,8 @@
 
 require "defaults"
 print(package.path)
-package.path = "?.lua;common/?.lua;frontend/?.lua"
-package.cpath = "?.so;common/?.so;/usr/lib/lua/?.so"
+package.path = "common/?.lua;rocks/share/lua/5.1/?.lua;frontend/?.lua;" .. package.path
+package.cpath = "common/?.so;common/?.dll;/usr/lib/lua/?.so;rocks/lib/lua/5.1/?.so;" .. package.cpath
 
 local DocSettings = require("docsettings")
 local _ = require("gettext")