multirom: lib: Fix landscape input layer on boot

 * Fix the input layer if the target device boots
    in landscape mode instead of portrait mode.

 * This commit introduces the following changes:
    a) The rotation code is fixed with respect to the proper
       offset and the coordinates are now scaled accordingly
    b) An additional define for devices is introduced such that
       the required rotation of the input layer to matches
       display rotation (MR_INPUT_ROTATION);

 * This value has to be given in degrees (90, 180, 270),
    the rotation direction is clockwise,
    and the 0 angle is the portrait mode of the device.

Change-Id: I0701fda49ba5cc890be2e7b3033fbc6915cc4898

Author: Diewi

device_defines.mk

@@ -87,6 +87,10 @@ else
     LOCAL_CFLAGS += -DMULTIROM_DEFAULT_BRIGHTNESS=40
 endif
 
+ifneq ($(MR_INPUT_ROTATION),)
+    LOCAL_CFLAGS += -DMR_INPUT_ROTATION=$(MR_INPUT_ROTATION)
+endif
+
 ifneq ($(MR_KEXEC_MEM_MIN),)
     LOCAL_CFLAGS += -DMR_KEXEC_MEM_MIN=\"$(MR_KEXEC_MEM_MIN)\"
 else

lib/input.c

@@ -222,7 +222,11 @@ int calc_mt_pos(int val, int *range, int d_max)
 
 static void mt_recalc_pos_rotation(touch_event *ev)
 {
-    switch(fb_rotation)
+    int rotation = fb_rotation;
+#ifdef MR_INPUT_ROTATION
+    rotation += MR_INPUT_ROTATION;
+#endif
+    switch(rotation % 360)
     {
         case 0:
             ev->x = ev->orig_x;
@@ -231,8 +235,14 @@ static void mt_recalc_pos_rotation(touch_event *ev)
         case 90:
             ev->x = ev->orig_y;
             ev->y = ev->orig_x;
-
-            ev->y = fb_height - ev->y;
+            
+            // Offset & inversion
+            ev->y = fb_width - ev->y;
+            
+            // Scaling
+            ev->x = ev->x * mt_screen_res[0]/mt_screen_res[1];
+            ev->y = ev->y * mt_screen_res[1]/mt_screen_res[0];
+            
             break;
         case 180:
             ev->x = fb_width - ev->orig_x;
@@ -242,7 +252,13 @@ static void mt_recalc_pos_rotation(touch_event *ev)
             ev->x = ev->orig_y;
             ev->y = ev->orig_x;
 
-            ev->x = fb_width - ev->x;
+            // Offset & inversion
+            ev->x = fb_height - ev->x;
+            
+            // Scaling
+            ev->x = ev->x * mt_screen_res[0]/mt_screen_res[1];
+            ev->y = ev->y * mt_screen_res[1]/mt_screen_res[0];
+            
             break;
     }
 }