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

[Thorsten Behrens]

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
available.

Cherry-pick into -3-5 appreciated.

http://cgit.freedesktop.org/libreoffice/core/commit/?id=83114b27fac8ef723cbbaa734237210d9ad56a15

Cheers,

-- Thorsten
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