Re: [AGG] Blending colors, associated alpha, etc

[Maxim S. <mcs...@ya...>]

> > I must admit AGG uses some messy combination of regular and premultiplied
> > methods. We'll need to clean it up and I think there should be both,
> > reguilar and premultiplied colorspaces.
> 
> Indeed, since both are useful. For instance, the Intel Integrated Perf.
> Primitives Imaging Library (or whatever the IPPI stands for) offers
> both premultiplied alpha composition and plain aRGB composition. The
> premultiplied version is significantly faster.

BTW, what about trying to use IPPI as a low level back-end for AGG? Are there
simple functions for blending horizontal/vertical spans?
All we need is to write an agg_pixfmt_ippi.h and maybe agg_color_ippi.h to
represent colors in more optimized way (say, use the IPPI-specific byte order).
Well, there are some difficulties with image transformations, but it's all
doable.

McSeem