The non-virtual filterColor4f handles premul and unpremul at the API
boundary. onFilterColor4f always works on premul colors.
To get the performance benefits, all color filters in a chain need
to override the virtual. For now, WorkingFormatColorFilter is the
other target, as builtin filters that use runtime effects are always
wrapped with that.
Net effect on matrix_filterColor4f timing:
before: 10000 ns
after : 380 ns
Bug: skia:11730
Change-Id: I43d06f22c082636c4eca9e58dc3bc8225d09c910
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/383705
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
9e6fc64988