Cairo / Highlighting


given cairo type cr which contains an icon. How can I produce some kind of highlighting on this icon. For example light it up a little and change the background (the parts which are transparent) to a different color (e.g white), or even using a light white blur as background.

Im sure it only requires a few calls to cairo but as I am not very familiar with cairo maybe someone can give me a suggestion.

Best Regarads

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