On Mon, Jun 2, 2014 at 7:07 PM, Robert O'Callahan <rob...@ocallahan.org> wrote:
> Off the top of my head, the places in Gecko I know of that use isIdentity > or is2D fall into two categories: > 1) math performance optimizations > 2) (is2D only) we're going to take an implementation approach that only > works for 2D affine transforms, and either a) there is no support for 3D > perspective transforms at all, or b) that support is implemented very > differently (e.g. transforming Bezier control points vs rendering to a > bitmap and applying 3D transform to that). > > For category #1 we can perhaps avoid having Web developers call > isIdentity/is2D, by optimizing internally. We simply haven't bothered to do > those optimizations in Gecko matrix classes, we let the callers do it (but > perhaps we should reconsider that). > Yes, isIdentity is used as an indication that nothing needs to be done or that the transform hasn't changed. Maybe we should rename it to isDefault, isInitial or isNoOp? > For category #2, I can't see a way around exposing is2D to the Web in some > form. > > _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
