visibility - Figuring out whether a feature is visible or not in pyqgis

I have a vector layer (lines) with a numeric (integer) attribute, let's call it Status. This layer is styled according to the attribute using a categorized style:

So far, so good. Now I'm trying to figure out a way to get the visibility status (i.e., I click the checkbox on the left) of a feature in this layer using pyqgis. Here's what I have so far:

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  It's possible to get the individual QgsRendererCategoryV2 instances by using layer.rendererV2().categories(). This categories, however, don't seem to contain the visibility information, but only the values and colors (or I'm missing something).

  
  


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  The individiual symbols (e.g. with layer.rendererV2().symbols()) don't help me either.

  
  

Ideally I would like a solution like feature.isCurrentlyVisible(), but I'm prepared to having to look up the attribute in the table myself.