psd file format specification how get the pixel values

Hello

I'm trying to convert psd to xml and get all information from layers

I already got all necessary  info  but for example  the radius  in rounded rectangle is in math double format but I need to have it in pixels.

I'm using Adope photoshop file format specification but  there is no information how to convert double values to pixels,

The same is with colors that also given in double.

I need to know how to convert these values to actual values

Thanks