I just rechecked in my inventory to find out why there is 37.5% transparent on the highlight : the texture is centered vertically and looks thinner than the icon. (
edit eeerff only because when the icon looks bigger when mouseovered...)
so if you want exactly the same look, just find a way to vertical-center it.(
edit : don't mind me i'm just typing out loud) (like maybe just 18.75% toward the bottom,idk). but still it doesn't explain why they would leave this 37% transparent, there must be an easier way... (edit : i don't take that back)
now edit with the picture, what i said was totally stupid. i should have known, my coffee is still in the mug
rerere edit : something to do with this? SetAutoAdjustWrappedCoords()... no idea... but anyway the result of whatever the method is is that bottom coord of 0.625