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

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

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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