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

[Jim B. <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