[CREATE] [Mypaint-discuss] OpenRaster spec: proposal: add svg:src-atop and svg:dst-atop

[Andrew Chadwick]

Just merged this onto MyPaint's master branch sorry for the delay.
Sample image and output:

https://github.com/mypaint/mypaint/issues/181#issuecomment-94327844

I'll update the OpenRaster spec shortly.

On 10 April 2015 at 00:20, Andrew Chadwick <a.t.chadwick at gmail.com> wrote:
> Certainly! I'll press ahead and test the contributed code out this
> weekend, and update the spec unless anyone has any objections.
>
> I'll bump the version to 0.0.5 as well. Heady heights...
>
> On 7 April 2015 at 13:49, Joao S. O. Bueno <gwidion at gmail.com> wrote:
>> No objections from me --
>>
>> Can I ask you to post links here to example images after this is done?
>> (both .ora files and PNG final rendering, please :-)  )
>>
>> I could probably have this ported into GIMP reading of ORA's
>> (I will probably have to expand these clipping layers as layer masks
>> for the time being)
>> ( of course, there is no promise for writing this as it is not a GIMP
>> feature as of yet).
>>
>>     js
>>   -><-
>>
>> On 7 April 2015 at 05:58, Andrew Chadwick <a.t.chadwick at gmail.com> wrote:
>>> Hi, CREATE-friends --
>>>
>>> We'd like to add support for the "Destination Atop" and (especially)
>>> "Source Atop" compositing modes in MyPaint, to allow users to make
>>> groups clipped by their bottom layer's alpha. Use case: add shadows
>>> and highlighting without having to create a separate masking layer set
>>> to dst-in/dst-out.
>>>
>>> https://github.com/mypaint/mypaint/pull/284
>>> https://github.com/mypaint/mypaint/issues/181#issuecomment-89778738
>>>
>>> http://www.w3.org/TR/compositing-1/#porterduffcompositingoperators_srcatop
>>> http://www.w3.org/TR/compositing-1/#porterduffcompositingoperators_dstatop
>>>
>>> Does anyone have any objection to "svg:src-atop" and "svg:dst-atop"
>>> being added to the list at:
>>>
>>> https://wiki.freedesktop.org/www/Specifications/OpenRaster/Draft/LayersStack/#composite-opattribute
>>>
>>> The blending function for the modes is to be Normal.
>>>
>>> I'm Cc:ing Boud because I bet Krita already has this... Hopefully the
>>> naming of the element won't be an issue; the pattern has always been
>>> fairly obvious.
>>>
>>> --
>>> Andrew Chadwick
>>>
>>> _______________________________________________
>>> Mypaint-discuss mailing list
>>> Mypaint-discuss at gna.org
>>> https://mail.gna.org/listinfo/mypaint-discuss
>
>
>
> --
> Andrew Chadwick



-- 
Andrew Chadwick