Shape radius different with RoundedCornersTransformation size

[anthony3637]

Describe the bug
1: we used the shape file to view's background
2: we used coil's RoundedCornersTransformation

but radius size difference, how to resolve it

shape.xml
`

<solid android:color="#22229900"/>
<corners android:radius="50dp"/>

`

activity xml:
![image](https://user-images.githubusercontent.com/4946107/170238402-3aa75c0e-3acd-49bb-ad7d-e9aaaee2324e.png)

activity code:
val current = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 50f, resources.displayMetrics) binding.img.load("xxx.jpg"){ transformations(RoundedCornersTransformation(current)) }

finally, we found different radius

[marazmone]

@anthony3637 did you find the solution?

[guuilp]

I'm moving from Glide to Coil and I saw this strange behavior too. In my case, I'm using 12f of Radius and the result is different between the libraries.

Since I saw some division by two on the RoundedCornersTransformation code, I tried to multiply my 12f radius by 2 and voilà: same result as Glide.

So the RoundedCornersTransformation is doing some wrong math.

[colinrtwhite]

Hmm looks like Glide uses canvas.drawRoundRect whereas Coil uses drawPath with a rounded rect. I'll take a look at this, though I'm worried changing the radius calculation now could break the way it works for existing users.

[guuilp]

Yeah, that won't be a easy decision to make.

Here the team uses the radius written by the designer on Figma. Glide visually reproduces the same rounding as the design, but Coil doesn't.

Maybe introduce a parameter on the transformation constructor to decide how to round the corners?

For me is not a big issue since we wrap coil in our on image-loader library: I added a multiply by 2 in there and it worked just as Glide used to work for us.