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Accumulate subpixels through stacking contexts #12543

Merged
merged 1 commit into from Jul 27, 2016
Merged

Accumulate subpixels through stacking contexts #12543

merged 1 commit into from Jul 27, 2016
+58 −25

Commits on Jul 27, 2016

  1. Accumulate subpixels through stacking contexts 

    Instead of simply rounding layer origins and discarding subpixel
offsets, accumulate them by transforming them into the space of the
next child stacking context. This is an attempt to eliminate subpixel
differences that are caused by different stacking context boundaries in
reference tests.

Currently these accumulated subpixels are only used for text
positioning, but the plan is that they can be used for all drawing in
the future.
    @mrobinson
    mrobinson committed Jul 27, 2016
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