[Webkit-unassigned] [Bug 108941] New: [HarfBuzz][Cairo] harfBuzzGetGlyph is slow and hot

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=108941

           Summary: [HarfBuzz][Cairo] harfBuzzGetGlyph is slow and hot
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Platform
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: dominik.rottsches at intel.com


Using a performance test similar to PerformanceTests/Layout/hindi-line-layout.html but replacing it with arabic test, we see that 
harfBuzzGetGlyph spends too much time in UTF8 encoding and talking to cairo for glyph lookup.

We should adopt a caching implementation similar to Skia's harfBuzzGetGlyph implementation. The infrastructure for this caching is already anchored in the m_glyphCacheForFaceCacheEntry member of HarfBuzzFace.

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