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

[Michael D. <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