Bug 220428

Summary:	[WinCairo] WebGL context creation should fail if accelerated compositing is disabled and the failIfMajorPerformanceCaveat context creation flag is set
Product:	WebKit	Reporter:	Fujii Hironori <Hironori.Fujii>
Component:	WebGL	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Normal	CC:	dino, kbr
Priority:	P2
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified
Bug Depends on:	220380
Bug Blocks:

Description Fujii Hironori 2021-01-07 12:21:16 PST

[WinCairo] WebGL context creation should fail if accelerated compositing is disabled and the failIfMajorPerformanceCaveat context creation flag is set

(In reply to James Darpinian from bug #220380 comment #3)
> In this case, context creation should fail when the
> failIfMajorPerformanceCaveat context creation flag is set. Can you verify
> that is working?

(In reply to James Darpinian from bug #220380 comment #6)
> This exact situation, using glReadPixels in the compositing path, is exactly
> why failIfMajorPerformanceCaveat was originally added to the spec. It is a
> big performance problem for fullscreen WebGL apps on high resolution
> monitors.