lib: gui: lvgl: fix touch point rotation equations

When rotation is 90 or 270 degrees X and Y resolution values will also
be swapped, so we need to take that into account.

Signed-off-by: Gerard Marull-Paretas <[email protected]>

Author: gmarull

lib/gui/lvgl/lvgl.c

@@ -225,29 +225,39 @@ static bool lvgl_pointer_kscan_read(lv_indev_drv_t *drv, lv_indev_data_t *data)
 	}
 
 	if (IS_ENABLED(CONFIG_LVGL_POINTER_KSCAN_INVERT_X)) {
-		prev.point.x = cap.x_resolution - prev.point.x;
+		if (cap.current_orientation == DISPLAY_ORIENTATION_NORMAL ||
+		    cap.current_orientation == DISPLAY_ORIENTATION_ROTATED_180) {
+			prev.point.x = cap.x_resolution - prev.point.x;
+		} else {
+			prev.point.x = cap.y_resolution - prev.point.x;
+		}
 	}
 
 	if (IS_ENABLED(CONFIG_LVGL_POINTER_KSCAN_INVERT_Y)) {
-		prev.point.y = cap.y_resolution - prev.point.y;
+		if (cap.current_orientation == DISPLAY_ORIENTATION_NORMAL ||
+		    cap.current_orientation == DISPLAY_ORIENTATION_ROTATED_180) {
+			prev.point.y = cap.y_resolution - prev.point.y;
+		} else {
+			prev.point.y = cap.x_resolution - prev.point.y;
+		}
 	}
 
 	/* rotate touch point to match display rotation */
 	if (cap.current_orientation == DISPLAY_ORIENTATION_ROTATED_90) {
 		lv_coord_t x;
 
 		x = prev.point.x;
-		prev.point.x = cap.y_resolution - prev.point.y;
-		prev.point.y = x;
+		prev.point.x = prev.point.y;
+		prev.point.y = cap.y_resolution - x;
 	} else if (cap.current_orientation == DISPLAY_ORIENTATION_ROTATED_180) {
 		prev.point.x = cap.x_resolution - prev.point.x;
 		prev.point.y = cap.y_resolution - prev.point.y;
 	} else if (cap.current_orientation == DISPLAY_ORIENTATION_ROTATED_270) {
 		lv_coord_t x;
 
 		x = prev.point.x;
-		prev.point.x = prev.point.y;
-		prev.point.y = cap.x_resolution - x;
+		prev.point.x = cap.x_resolution - prev.point.y;
+		prev.point.y = x;
 	}
 
 	*data = prev;