[PATCH] utils: raspberrypi: ctt: Fix integer division error calculating LSC cell size

[David Plowman]

The cell sizes must be cast to integers as the parameters that
were passed in may be floats.

Bug: https://github.com/raspberrypi/libcamera/issues/260
Signed-off-by: David Plowman <david.plowman at raspberrypi.com>
Fixes: 36ba0e551507 ("utils: raspberrypi: ctt: Fix NaNs in lens shading tables")
---
 utils/raspberrypi/ctt/ctt_alsc.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/utils/raspberrypi/ctt/ctt_alsc.py b/utils/raspberrypi/ctt/ctt_alsc.py
index f4fd09e3..5d8b2ced 100644
--- a/utils/raspberrypi/ctt/ctt_alsc.py
+++ b/utils/raspberrypi/ctt/ctt_alsc.py
@@ -131,7 +131,7 @@ def alsc(Cam, Img, do_alsc_colour, plot=False, grid_size=(16, 12), max_gain=8.0)
     pixels.
     """
     w, h = Img.w/2, Img.h/2
-    dx, dy = (w - 1) // (grid_w - 1), (h - 1) // (grid_h - 1)
+    dx, dy = int((w - 1) // (grid_w - 1)), int((h - 1) // (grid_h - 1))
 
     """
     average the green channels into one
-- 
2.34.1