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

[Wojciech M. <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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