Intent to Ship: Subpixel font scaling

[Emil A Eklund]

Primary eng/PM emails
e...@chromium.org

Spec
n/a

Summary
Enable support for subpixel font sizes.

Motivation
Allow sub-css-pixel font-sizes and thus smooth font scaling which in
turn allows for stable layout when zooming and drastically improves
readability and font rendering quality on high dpi devices.

Ongoing technical constraints
Will be enabled in conjunciton with DirectWrite on windows. Not
supported on older Windows versions (see below). Currently the Mac
implementation has slightly lower precision than the other platforms.

Will this feature be supported on all five Blink platforms (Windows, Mac, Linux,
Chrome OS, and Android)?
Almost, will not be supported on non-DW windows (Win 7 sp1 and earlier)

Entry in Chromium Dashboard
http://www.chromestatus.com/features/6259163214643200

OWP launch tracking bug
https://code.google.com/p/chromium/issues/detail?id=164167

[Eric Seidel]

Presumably our implementation more/less matches FF and IE who have
also shipped this feature?

LGTM!

[Dimitri Glazkov]

LGTM2!

[Alex Russell]

LGTM3! So excited to see this happening.

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[Darin Fisher]

LGTM

On Sat, May 17, 2014 at 1:54 AM, Emil A Eklund <e...@chromium.org> wrote:

[Emil A Eklund]

On Sat, May 17, 2014 at 5:30 AM, Eric Seidel <ese...@chromium.org> wrote:

> Presumably our implementation more/less matches FF and IE who have
> also shipped this feature?

It does. We have slightly higher precision though.
http://blink.gs/tests/text-scaling/ has a couple of tests
demonstrating the feature.

[Elliott Sprehn]

Is this going to regress font rendering on OS X? Mac users tend to be really sensitive to font changes.

- E

[Emil A Eklund]

It will change how some subpixel font sizes are rendered, whether that
is a regression or not is up for debate.