[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
https://bugs.webkit.org/show_bug.cgi?id=147826
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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