Revert "SkRasterPipelineBlitter: support A8"

This reverts commit f44373c119290b501d4aec7385e16d12c28a1f0f.

Reason for revert: MSAN

Original change's description:
> SkRasterPipelineBlitter: support A8
> 
> This adds support for loading and storing A8, then uses it in SkRasterPipelineBlitter.
> 
> I think this handles all dst formats now: A8, 565, 8888 (by policy, sRGB only) and F16.
> 
> CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel;skia.primary:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD
> 
> 
> Change-Id: Id207f6e6c56b6bfcc301d77dd23e0959bb7afba8
> Reviewed-on: https://skia-review.googlesource.com/6554
> Reviewed-by: Mike Reed <reed@google.com>
> Commit-Queue: Mike Klein <mtklein@chromium.org>
> 

TBR=mtklein@chromium.org,reed@google.com,reviews@skia.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Change-Id: I9ead3c3335e1776e9a1639ca0481253821505d67
Reviewed-on: https://skia-review.googlesource.com/6625
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Mike Klein <mtklein@chromium.org>

4 files changed, 1 insertions, 19 deletions

diff --git a/src/core/SkRasterPipeline.h b/src/core/SkRasterPipeline.h
index 4d8e9abec6..3b18b73470 100644
--- a/src/core/SkRasterPipeline.h
+++ b/src/core/SkRasterPipeline.h
@@ -65,7 +65,6 @@
     M(from_srgb) M(from_srgb_d) M(to_srgb)                       \
     M(from_2dot2) M(to_2dot2)                                    \
     M(constant_color) M(store_f32)                               \
-    M(load_a8)   M(load_a8_d)   M(store_a8)                      \
     M(load_565)  M(load_565_d)  M(store_565)                     \
     M(load_f16)  M(load_f16_d)  M(store_f16)                     \
     M(load_8888) M(load_8888_d) M(store_8888)                    \
diff --git a/src/core/SkRasterPipelineBlitter.cpp b/src/core/SkRasterPipelineBlitter.cpp
index 19e00dedf5..cbdb09faa4 100644
--- a/src/core/SkRasterPipelineBlitter.cpp
+++ b/src/core/SkRasterPipelineBlitter.cpp
@@ -79,10 +79,9 @@ SkBlitter* SkCreateRasterPipelineBlitter(const SkPixmap& dst,
 
 static bool supported(const SkImageInfo& info) {
     switch (info.colorType()) {
-        case kAlpha_8_SkColorType:  return true;
-        case kRGB_565_SkColorType:  return true;
         case kN32_SkColorType:      return info.gammaCloseToSRGB();
         case kRGBA_F16_SkColorType: return true;
+        case kRGB_565_SkColorType:  return true;
         default:                    return false;
     }
 }
@@ -188,7 +187,6 @@ void SkRasterPipelineBlitter::append_load_d(SkRasterPipeline* p) const {
     SkASSERT(supported(fDst.info()));
 
     switch (fDst.info().colorType()) {
-        case kAlpha_8_SkColorType:   p->append(SkRasterPipeline::load_a8_d,   &fDstPtr); break;
         case kRGB_565_SkColorType:   p->append(SkRasterPipeline::load_565_d,  &fDstPtr); break;
         case kBGRA_8888_SkColorType:
         case kRGBA_8888_SkColorType: p->append(SkRasterPipeline::load_8888_d, &fDstPtr); break;
@@ -213,7 +211,6 @@ void SkRasterPipelineBlitter::append_store(SkRasterPipeline* p) const {
 
     SkASSERT(supported(fDst.info()));
     switch (fDst.info().colorType()) {
-        case kAlpha_8_SkColorType:   p->append(SkRasterPipeline::store_a8,   &fDstPtr); break;
         case kRGB_565_SkColorType:   p->append(SkRasterPipeline::store_565,  &fDstPtr); break;
         case kBGRA_8888_SkColorType:
         case kRGBA_8888_SkColorType: p->append(SkRasterPipeline::store_8888, &fDstPtr); break;
diff --git a/src/opts/SkNx_sse.h b/src/opts/SkNx_sse.h
index d52509a03e..394115626e 100644
--- a/src/opts/SkNx_sse.h
+++ b/src/opts/SkNx_sse.h
@@ -650,10 +650,6 @@ public:
                 hi = _mm256_extractf128_si256(src.fVec, 1);
         return _mm_packus_epi32(lo, hi);
     }
-    template<> AI /*static*/ Sk8b SkNx_cast<uint8_t>(const Sk8i& src) {
-        auto _16 = SkNx_cast<uint16_t>(src);
-        return _mm_packus_epi16(_16.fVec, _16.fVec);
-    }
 
 #endif
 
diff --git a/src/opts/SkRasterPipeline_opts.h b/src/opts/SkRasterPipeline_opts.h
index b055c87afe..3b877ce156 100644
--- a/src/opts/SkRasterPipeline_opts.h
+++ b/src/opts/SkRasterPipeline_opts.h
@@ -503,16 +503,6 @@ STAGE_CTX(lerp_565, const uint16_t**) {
     a = 1.0f;
 }
 
-STAGE_CTX(load_a8, const uint8_t**) {
-    auto ptr = *ctx + x;
-    r = g = b = 0.0f;
-    a = SkNf_from_byte(load(tail, ptr));
-}
-STAGE_CTX(store_a8, uint8_t**) {
-    auto ptr = *ctx + x;
-    store(tail, SkNx_cast<uint8_t>(SkNf_round(255.0f, a)), ptr);
-}
-
 STAGE_CTX(load_565, const uint16_t**) {
     auto ptr = *ctx + x;
     from_565(load(tail, ptr), &r,&g,&b);