On Monday 27 March 2017 11:08:19 code dz wrote:
> but what cornermask.row is refer to ?
> for example a button has 4 corners , how much row needs ?
>
For the posted example the topleft-mask is:
                       1 1 1 1 1 1
   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
 0 x x x x x x x x x x x x x x x x
 1 x x x x x x x x x x x x x x x
 2 x x x x x x x x x x x x x x
 3 x x x x x x x x x x x x x
 4 x x x x x x x x x x x x
 5 x x x x x x x x x x x
 6 x x x x x x x x x x
 7 x x x x x x x x x
 8 x x x x x x x x
 9 x x x x x x x
10 x x x x x x
11 x x x x x
12 x x x x
13 x x x
14 x x
15 x

Top right corner mask is mirrored at y-axis, bottom left is mirrored at x-axis 
and bottom right is mirrored at x- and y-axis.

Martin

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