Performance regression with Blendmode introduction

[christoph-hart]

It appears that the commit that introduces the AfterEffects blend mode simulation vastly decreases the performance of the renderer.

1916436

[JSUYA]

Hi @mihashco @JoogabYun Can you review this issue and performance check?
1916436#commitcomment-121705281

[JoogabYun]

Yes we are taking this seriously. We are trying to improve.

[smohantty]

I think the patch makes every layer rendering goes through intermediate buffer instead of only layers which needs this ( has blending mode ) . I think it will be better to revert this patch and put one slow path only for the particular usecase.

[JoogabYun]

Fixed with this patch.
#546

[KonstantinRitt]

fixed by f969abf