Only clamping when we set up ClearType params leaves the possibility that default params can still have invalid values, which can trigger assertions like in bug 1348584 comment 20. It's better to clamp things when we're creating the Skia typeface, that way Skia always only ever gets valid values.
Attachment #8889513 - Flags: review?(mchang)
Attachment #8889513 - Flags: review?(mchang) → review+
Pushed by email@example.com: https://hg.mozilla.org/integration/mozilla-inbound/rev/02a519055f6f clamp gamma/contrast for ScaledFontDWrite when creating SkTypeface. r=mchang
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