tree a084e69a3dd6b76cb91db94979d9dfb784e392c9
parent 8f44c6a7d67fb77bce0518af9c582986cd4b9e10
author commit-queue@webkit.org <commit-queue@webkit.org@268f45cc-cd09-0410-ab3c-d52691b4dbfc> 1524794425 +0000
committer commit-queue@webkit.org <commit-queue@webkit.org@268f45cc-cd09-0410-ab3c-d52691b4dbfc> 1524794425 +0000

tex[Sub]Image2D slow when passing in a <canvas>, faster with ImageData.
https://bugs.webkit.org/show_bug.cgi?id=184843
<rdar://problem/34898868>

Patch by Justin Fan <justin_fan@apple.com> on 2018-04-26
Reviewed by Simon Fraser.

On certain test pages passing 2d canvas objects to gl.texSubImage2D, we spend significant time doing an alpha unpremultiplication in FormatConverter::convert on a single thread.
For now, I am introducing use of the Accelerate framework to do canvas alpha unpremultiplication, specifically for RGBA8 > RGBA8.
This improves this rendering path by a factor of ~4. The rest of FormatConverter could use similar improvements; filed https://bugs.webkit.org/show_bug.cgi?id=185064 for these.

* platform/graphics/FormatConverter.cpp:
(WebCore::FormatConverter::convert):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@231084 268f45cc-cd09-0410-ab3c-d52691b4dbfc