first demo of screen rotate

frontend/ui/screen.lua

@@ -40,18 +40,42 @@ Codes for rotation modes:
 
 
 Screen = {
-	cur_rotation_mode = 0,
-	-- these two variabls are used to help switching from framework to reader
+	width = 0,
+	height = 0,
+	pitch = 0,
 	native_rotation_mode = nil,
-	kpv_rotation_mode = nil,
+	cur_rotation_mode = 0,
 
+	bb = nil,
 	saved_bb = nil,
 
-	fb = einkfb.open("/dev/fb0")
+	fb = einkfb.open("/dev/fb0"),
 }
 
+function Screen:init()
+	_, self.height = self.fb:getSize()
+	-- for unknown strange reason, pitch*2 is less than screen width in KPW
+	-- so we need to calculate width by pitch here
+	self.width = self.fb:getPitch()*2
+	self.pitch = self:getPitch()
+	self.bb = Blitbuffer.new(self.width, self.height, self.pitch)
+	self.native_rotation_mode = self.fb:getOrientation()
+	self.cur_rotation_mode = self.native_rotation_mode
+end
+
+function Screen:refresh(refesh_type)
+	if self.native_rotation_mode ==  self.cur_rotation_mode then
+		self.fb.bb:blitFrom(self.bb, 0, 0, 0, 0, self.width, self.height)
+	elseif self.native_rotation_mode == 0 and self.cur_rotation_mode == 1 then
+		self.fb.bb:blitFromRotate(self.bb, 270)
+	end
+	self.fb:refresh(refesh_type)
+end
+
 -- @orien: 1 for clockwise rotate, -1 for anti-clockwise
 -- Remember to reread screen resolution after this function call
+-- WARNING: this method is deprecated!!! use setRotationMode() or
+-- setViewMode() instead.
 function Screen:screenRotate(orien)
 	if orien == "clockwise" then
 		orien = -1
@@ -70,22 +94,19 @@ function Screen:screenRotate(orien)
 end
 
 function Screen:getSize()
-	local w, h = self.fb:getSize()
-	return Geom:new{w = w, h = h}
+	return Geom:new{w = self.width, h = self.height}
 end
 
 function Screen:getWidth()
-	local w, _ = self.fb:getSize()
-	return w
+	return self.width
 end
 
 function Screen:getHeight()
-	local _, h = self.fb:getSize()
-	return h
+	return self.height
 end
 
 function Screen:getPitch()
-	return self.fb:getPitch()
+	return self.ptich
 end
 
 function Screen:updateRotationMode()
@@ -94,7 +115,46 @@ function Screen:updateRotationMode()
 end
 
 function Screen:setRotationMode(mode)
-	self.fb:setOrientation(Screen.native_rotation_mode)
+	-- mode 0 and mode 2 has the same width and height, so do mode 1 and 3
+	if (self.cur_rotation_mode % 2) ~= (mode % 2) then
+		self.width, self.height = self.height, self.width
+	end
+	self.cur_rotation_mode = mode
+	self.bb:free()
+	self.pitch = self.width/2
+	self.bb = Blitbuffer.new(self.width, self.height, self.pitch)
+end
+
+function Screen:setViewMode(mode)
+	if mode == "portrait" then
+		if self.cur_rotation_mode ~= 0 then
+			self:setRotationMode(0)
+		end
+	elseif mode == "landscape" then
+		if self.cur_rotation_mode ~= 1 then
+			self:setRotationMode(1)
+		end
+	end
+end
+
+
+--[[
+  @brief change gesture's x and y coordinates according to screen view mode
+
+  @param ges gesture that you want to adjust
+  @return adjusted gesture.
+--]]
+function Screen:adjustGesCoordinate(ges)
+	-- we do nothing is screen is not rotated
+	if self.native_rotation_mode == self.cur_rotation_mode then
+		return ges
+	end
+
+	if self.native_rotation_mode == 0 and self.cur_rotation_mode == 1 then
+		ges.pos.x, ges.pos.y = (self.width - ges.pos.y), (ges.pos.x)
+	end
+
+	return ges
 end
 
 function Screen:saveCurrentBB()