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Re: [fxtf-drafts] [filter-effects][compositing] What is "no-composite" blending?

From: Rik Cabanier via GitHub <sysbot+gh@w3.org>
Date: Sun, 31 Dec 2017 03:47:21 +0000
To: public-fxtf-archive@w3.org
Message-ID: <issue_comment.created-354583591-1514692040-sysbot+gh@w3.org>
The issue with feblend is that it combines blending and compositing. This mean that the filter operation composites with the backdrop and this result is then again composited.
This results in double compositing which gives the wrong result when there's alpha.

no-composite was supposed to skip the compositing operation during the filter to work around this problem.
https://www.w3.org/TR/compositing-1/#blending gives the result with regular alpha compositing. For no-composite=true, the composting part becomes "copy" (https://www.w3.org/TR/compositing-1/#porterduffcompositingoperators_src) and the blending part stays the same

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