Basic pipeline blend mode strength reductions:
- when the shader is opaque, srcover becomes src
- don't load dst when blitting in src mode with full coverage
- fold coverage into src alpha when in srcover mode
It's not obvious that we can fold coverage into src alpha when using a 565 mask, so I've not attempted that. What would we do about alpha?
Over all GMs this causes a single 1-bit difference in sRGB mode. No 565 or f16 diffs.
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4349
CQ_INCLUDE_TRYBOTS=master.client.skia:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD-Trybot
Change-Id: Ib9161f498c4efa6b348ca74522166da64d09a7da
Reviewed-on: https://skia-review.googlesource.com/4349
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
3 files changed