Re: Plan for reintegration of Hit Regions into Canvas 2D Level 1

Thanks Mark!

I think there will be 2 more issues that we will need to resolve
1. hit regions are currently defined as a group of pixels. This causes a
lot of complexity which is why I think they should be defined as paths
instead.
2. Robert O'Callahan had some questions how events are handled. This needs
to be clarified in the spec (and could potentially complicate its
implementation)


On Tue, Mar 11, 2014 at 7:58 AM, Mark Sadecki <mark@w3.org> wrote:

> Hi All,
>
> Based on discussions from the Canvas Accessibility Sub-Group meeting on
> Monday 10 MAR 2014 [1], there was consensus that the version of the Hit
> Regions [2] spec I provided for review last week could be used as a base
> document for reintegration into the Level 1 spec with the following
> exceptions and notes:
>
> * Remove all mentions of and references to fillRule().
> * clearRect() should be the only method for clearing a region.  Adding a
> region that fully encompasses another region should not remove the
> encompassed region.  It should remain in case the encompassing region is
> removed (we should file a bug against WHAT WG regarding this as well).
> * Change all references to the "scratch bitmap" to "the canvas element"
>
> There was consideration of adding a glossary and/or other non-normative
> text to introduce parts of the specification that the purpose for may not
> be immediately obvious.  However, there was concern that the addition of
> lots of informative text would cause a noticeable deviation from the WHAT
> WG spec and would not be consistent with other parts of this spec.
>
> Unless there is disagreement with the above, I propose we move forward
> with reintegrating Hit Regions [1] back into the Canvas 2D Level 1 spec.
>  Bugs against the reintegrated text can be filed if additional issues are
> identified.
>
> Best,
>
> Mark
>
> [1] http://www.w3.org/2014/03/10-html-a11y-minutes.html
> [2]
> http://lists.w3.org/Archives/Public/public-canvas-api/2014JanMar/att-0165/HitRegionsL1.html
>
> --
> Mark Sadecki
> Web Accessibility Engineer
> World Wide Web Consortium, Web Accessibility Initiative
> Telephone: +1.617.715.4017
> Email: mark@w3.org
> Web: http://w3.org/People/mark
>
>