Re: [AGG] Blending (again) [resend]

[Wojciech M. <wm...@gm...>]

Have you tried my patch?

2014-10-28 21:03 GMT+01:00 Michael Droettboom <md...@st...>:
> Any thoughts/pointers about where I could start to fix this?
>
> Cheers,
> Mike
>
>
> On 10/17/2014 02:25 PM, Wojciech Mamrak wrote:
>
> I thought it was more sophisticated, but it turns out that changes to
> revisions [99, 102) were more involving.
>
> 2014-10-17 19:56 GMT+02:00 Wojciech Mamrak <wm...@gm...>:
>
> I might have a patch ready for this, brb.
>
> 2014-10-17 19:42 GMT+02:00 Jim Barry <ji...@ch...>:
>
> On 17 October 2014 17:52, Michael Droettboom <md...@st...> wrote:
>
> In agg-2.4, if I draw a rectangle path with RGB value of (0, 255, 102,
> 64), the resulting pixel value is (0, 255, 102, 64).
>
> In agg-svn, I get (0, 255, 104, 64).
>
> it seems the difference is not so much in anything intentional
> but from the fact that everything but the final demultiply is downgraded
> to color_type, and then the demultiply happens. Whereas in the old
> version, it’s still doing calculations in calc_type (uint16) up until
> the final demultiply.
>
> Yes, I see the problem. I suppose it must have happened when refactoring for
> the floating-point support. I will try to think of a solution.
>
> - Jim
>
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> --
> Michael Droettboom
> Science Software Branch
> Space Telescope Science Institute
>
> http://www.droettboom.com
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