Revert "Use RasterPipeline to support full precision on 16-bit RGBA pngs"

This reverts commit bb2339da39ab3ee59121acd911920dafcd4a2f72.

Reason for revert: Breaks MSAN

Original change's description:
> Use RasterPipeline to support full precision on 16-bit RGBA pngs
> 
> TODO: Support more precision on 16-bit RGB pngs
> 
> BUG=skia:
> 
> CQ_INCLUDE_TRYBOTS=skia.primary:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD
> 
> Change-Id: I89dfef3b4887b9c4895c17309933883ab90ffa4d
> Reviewed-on: https://skia-review.googlesource.com/6260
> Reviewed-by: Mike Reed <reed@google.com>
> Reviewed-by: Leon Scroggins <scroggo@google.com>
> Reviewed-by: Mike Klein <mtklein@chromium.org>
> Commit-Queue: Matt Sarett <msarett@google.com>
> 

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

Change-Id: I47579c20af033a75883e2b35567cb9c690ce54b0
Reviewed-on: https://skia-review.googlesource.com/6975
Commit-Queue: Matt Sarett <msarett@google.com>
Reviewed-by: Matt Sarett <msarett@google.com>

1 files changed, 1 insertions, 13 deletions

diff --git a/src/codec/SkSwizzler.cpp b/src/codec/SkSwizzler.cpp
index 9a339d4405..415f0f1ddc 100644
--- a/src/codec/SkSwizzler.cpp
+++ b/src/codec/SkSwizzler.cpp
@@ -51,16 +51,6 @@ static void sample4(void* dst, const uint8_t* src, int width, int bpp, int delta
     }
 }
 
-static void sample8(void* dst, const uint8_t* src, int width, int bpp, int deltaSrc, int offset,
-        const SkPMColor ctable[]) {
-    src += offset;
-    uint64_t* dst64 = (uint64_t*) dst;
-    for (int x = 0; x < width; x++) {
-        dst64[x] = *((const uint64_t*) src);
-        src += deltaSrc;
-    }
-}
-
 // kBit
 // These routines exclusively choose between white and black
 
@@ -818,9 +808,7 @@ SkSwizzler* SkSwizzler::CreateSwizzler(const SkEncodedInfo& encodedInfo,
                 break;
             case kRGBA_8888_SkColorType:
             case kBGRA_8888_SkColorType:
-                SkASSERT(16 == encodedInfo.bitsPerComponent() ||
-                          8 == encodedInfo.bitsPerComponent());
-                proc = (8 == encodedInfo.bitsPerComponent()) ? &sample4 : &sample8;
+                proc = &sample4;
                 fastProc = &copy;
                 break;
             default: