proposal: golang.org/x/image/math/fixed: a place for fixed-point types.

[Nigel Tao]

I propose to create a new golang.org/x/image/math/fixed package for
common fixed-point types to be used by Go graphics libraries, whether
on golang.org/x, github.com, or anywhere else.

This would be analogous to how golang.org/x/image/math/f64 holds
common vector and matrix types for Go graphics libraries.

Specifically, the types would be:

----

package fixed

// Int26 is a 26.6 fixed point number.
type Int26 int32

// Int52 is a 52.12 fixed point number.
type Int52 int64

----

Read (not much more) about it at https://github.com/golang/go/issues/11906

[Brendan Tracey]

This is in /x/image/math/fixed instead of /x/math/fixed because it only supports specific fixed point numbers and is not a general fixed point package?

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[Nigel Tao]

On Wed, Jul 29, 2015 at 1:02 AM, Brendan Tracey
<tracey....@gmail.com> wrote:
> This is in /x/image/math/fixed instead of /x/math/fixed because it only supports specific fixed point numbers and is not a general fixed point package?

I prefer to keep the proposal discussion on the issue at
https://github.com/golang/go/issues/11906 but while I'm here...

It's really in x/image/math instead of x/math because x/math does not
exist, and it doesn't seem worth creating it just for a tiny package,
and I anticipate that most of the use of x/image/math/fixed is for
graphics-related things.

But, yes, there will only be two specific types in this package, and
it isn't intended to support arbitrary M.N fixed point numbers.