add color filter support
- move some helpers to central spot
- add a color filter interface, the same as shader without (x,y)
- implement matrix color filter (pretty naively)
and color filter shader (pretty reasonably)
- extend GM to demonstrate
The new blitters with color filters are failing to JIT because they're
running out of registers. (They still work fine on the interpreter of
course.) I'm going to take a look to see whether there's something I
can do either in the effect program() code or in the optimizer to
rearrange to get it to fit and JIT.
Cq-Include-Trybots: skia.primary:Test-Debian9-Clang-GCE-CPU-AVX2-x86_64-Debug-All-SK_USE_SKVM_BLITTER
Change-Id: Ibdc1a5e7b9e7a14778efba583b7821bcd4f3062a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/252788
Reviewed-by: Mike Klein <mtklein@google.com>
9 files changed