Pixel conversion refactors: use raster pipeline for 565 and gray

I'm trying not to do too much in one CL.  But, in general, I hope
to drop (non-performance important/optimized) special cases and
use the pipeline.

BUG=skia:

CQ_INCLUDE_TRYBOTS=skia.primary:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD

Change-Id: I724d3982f1467f6232371360b860484f13b1ede8
Reviewed-on: https://skia-review.googlesource.com/8271
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Matt Sarett <msarett@google.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/opts/SkRasterPipeline_opts.h b/src/opts/SkRasterPipeline_opts.h
index dec81d990a..4f01fd5b70 100644
--- a/src/opts/SkRasterPipeline_opts.h
+++ b/src/opts/SkRasterPipeline_opts.h
@@ -520,6 +520,12 @@ STAGE_CTX(store_a8, uint8_t**) {
     store(tail, SkNx_cast<uint8_t>(SkNf_round(255.0f, a)), ptr);
 }
 
+STAGE_CTX(load_g8, const uint8_t**) {
+    auto ptr = *ctx + x;
+    r = g = b = SkNf_from_byte(load(tail, ptr));
+    a = 1.0f;
+}
+
 STAGE_CTX(load_565, const uint16_t**) {
     auto ptr = *ctx + x;
     from_565(load(tail, ptr), &r,&g,&b);