EdgeSizesLeftRight
Vec2 = [10, 10] Width of the left and of the right cap. In the image it is a distance in texels from the left and from the right edge to the cut. On screen it is the width of the cap in pixels of the icon's layout.
A horizontal three-slice packed image provider: the whole image is cut into a left cap, a middle and a right cap. The caps keep their width and the middle stretches. All three pieces stretch to the icon's full height.
Slicing and the scaling of the edge sizes are described on IUiTextureDataProvider.
Vec2 = [10, 10] Width of the left and of the right cap. In the image it is a distance in texels from the left and from the right edge to the cut. On screen it is the width of the cap in pixels of the icon's layout.