[Webkit-unassigned] [Bug 147826] New: [Cairo] Improve image quality when using newer versions of cairo/pixman

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Mon Aug 10 06:05:03 PDT 2015


            Bug ID: 147826
           Summary: [Cairo] Improve image quality when using newer
                    versions of cairo/pixman
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Keywords: Cairo
          Severity: Normal
          Priority: P2
         Component: Platform
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: cgarcia at igalia.com

Since cairo 1.14 the image filters changed a bit:

 - CAIRO_FILTER_GOOD uses a box filter when downscaling if the scale factor is less than 0.75, otherwise it uses a filter equivalent to CAIRO_FILTER_BILINEAR.
 - CAIRO_FILTER_BEST uses always a Catmull-Rom filter.

We are currently using CAIRO_FILTER_BILINEAR for medium, high and default interpolation levels. We could use CAIRO_FILTER_GOOD for medium and default, and CAIRO_FILTER_BEST for high. This will not have any effect in previous versions of cairo because before 1.14 CAIRO_FILTER_GOOD, CAIRO_FILTER_BILINEAR and CAIRO_FILTER_BEST had the same implementation in pixman.

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