[Webkit-unassigned] [Bug 261101] New: [TextureMapper] Shrink texture before applying large radius blur

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=261101

            Bug ID: 261101
           Summary: [TextureMapper] Shrink texture before applying large
                    radius blur
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Platform
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: aki.develop8128 at gmail.com

This is a sub issue of https://bugs.webkit.org/show_bug.cgi?id=231653

As Bug231653 pointed out, current blurring causes a mosaic artifacts when the blur radius is large.

The promissing solution is to shrink the texture before applying blur filter and expand again, which seems a common technique and skia uses it as well.
ref: https://github.com/google/skia/blob/0f9e50daa87997d376bf5fb60b06ab5b15c63ed9/src/gpu/ganesh/GrBlurUtils.cpp#L2580-L2586.

This is the main sub issue of Bug231653 but separeted from Bug231653 because But231653 will includes additional refactoring issue and performance issue.

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