[webkit-dev] Proposal for serializing alpha channel values; request for algorithm help

Simon Fraser simon.fraser at apple.com
Mon Nov 2 08:37:37 PST 2015

> On Nov 1, 2015, at 7:40 PM, Darin Adler <darin at apple.com> wrote:
> Hi folks.
> Our engine supports alpha values from 0-255. But when we serialize them, we turn them into floating point values. When we do that, we include way too many digits of precision. For example, the alpha value 127 becomes 0.498039.
> I like the idea of writing the minimum number of digits that are needed to round trip. So 127 would become 0.498 or even maybe 0.49 and 128 would become 0.5.
> Three questions:
> 1) Does the CSS specification allow or encourage this?

As long as the values round-trip, I think it’s OK.

> 2) Do you like this idea?

I would like to know what other browsers do.


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