[REVIEW-3-5] Consistent use of alpha in cairocanvas

Thorsten Behrens thb at documentfoundation.org
Fri Mar 16 09:43:26 PDT 2012

Hi there,

the cairocanvas was slightly inconsistent in it's use of the alpha
channel, when copying from a vcl bitmap.

Cosmetic change to use GetIndex() instead of GetBlue() (same
component), and use 255 aka opaque if no alpha bitmap access

Cherry-pick into -3-5 appreciated.



-- Thorsten
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