[Webkit-unassigned] [Bug 226254] New: Premultiplication handled incorrectly for WebGL canvases display and upload
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Tue May 25 17:54:55 PDT 2021
https://bugs.webkit.org/show_bug.cgi?id=226254
Bug ID: 226254
Summary: Premultiplication handled incorrectly for WebGL
canvases display and upload
Product: WebKit
Version: Safari Technology Preview
Hardware: Mac (Intel)
URL: https://codepen.io/kainino0x/pen/oNZwoJQ
OS: macOS 11
Status: NEW
Severity: Normal
Priority: P2
Component: WebGL
Assignee: webkit-unassigned at lists.webkit.org
Reporter: kainino at google.com
CC: dino at apple.com, kbr at google.com, kkinnunen at apple.com
Created attachment 429720
--> https://bugs.webkit.org/attachment.cgi?id=429720&action=review
Reproduction case
1. Open https://codepen.io/kainino0x/pen/oNZwoJQ (or the attached file)
Expected result:
The six WebGL-rendered canvases should match the six 2d-rendered canvases (with the exception described in the test case).
Actual result:
See attached. From inspection, I think (but I'm not sure):
- Canvases with premultiplyAlpha:false are treated as if they have premultiplyAlpha:true
(both when they are displayed, and when they are used as sources to texImage2D).
- texImage2D from webgl canvas sources with premultiplyAlpha:false are incorrectly y-flipped.
On macOS 11.3.1 (20E241):
- Pass: Chrome - 92.0.4515.7 (Official Build) canary (x86_64)
- Pass: Firefox - 90.0a1 (2021-05-18) (64-bit)
- FAIL: Safari Stable - Version 14.1 (16611.1.21.161.6)
- FAIL: Safari Technology Preview - Release 124 (Safari 14.2, WebKit 16612.1.11.10)
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