[poppler] [RFC] Add option to keep alpha channel to Qt frontends

[Adam Reichold]

Hello again,

Am 03.07.2015 um 20:32 schrieb Albert Astals Cid:
>> Not doing the alpha blending (but exporting the alpha channel) is still
>> faster, i.e. also slightly above two percent in the same benchmarks.
>> (Meaning XBGR8 with paper colour is 2.2 % slower than RGB8 with paper
>> colour which itself is 2.2 % slower than XBGR8 without paper colour.)
> 
> What about BGR8 without paper colour?

I am not sure this is useful because what would you do with an image
without the alpha channel and without the background colour blended in?
(You can do it of course, but it does look horrible when for example
painting this on top of the paper colour using QPainter.)

Best regards, Adam.

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