remove U16 support, just support F16

src/core/SkSpriteBlitter4f.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkSpriteBlitter.h"
 #include "SkSpanProcs.h"
 #include "SkTemplates.h"
@@ skipping 16 matching lines @@
 
 private:
     typedef SkSpriteBlitter INHERITED;
 };
 
 ///////////////////////////////////////////////////////////////////////////////////////////////////
 
 class Sprite_F16 : public Sprite_4f {
 public:
     Sprite_F16(const SkPixmap& src, const SkPaint& paint) : INHERITED(src, paint) {
-        uint32_t flags = SkXfermode::kDstIsFloat16_D64Flag;
+        uint32_t flags = 0;
         if (src.isOpaque()) {
-            flags |= SkXfermode::kSrcIsOpaque_D64Flag;
+            flags |= SkXfermode::kSrcIsOpaque_F16Flag;
         }
-        fWriter = SkXfermode::GetD64Proc(fXfer, flags);
+        fWriter = SkXfermode::GetF16Proc(fXfer, flags);
     }
 
     void blitRect(int x, int y, int width, int height) override {
         SkASSERT(width > 0 && height > 0);
         uint64_t* SK_RESTRICT dst = fDst.writable_addr64(x, y);
         size_t dstRB = fDst.rowBytes();
 
         for (int bottom = y + height; y < bottom; ++y) {
             fLoader(fSource, x - fLeft, y - fTop, fBuffer, width);
             fFilter(*fPaint, fBuffer, width);
             fWriter(fXfer, dst, fBuffer, width, nullptr);
             dst = (uint64_t* SK_RESTRICT)((char*)dst + dstRB);
         }
     }
 
 private:
-    SkXfermode::D64Proc fWriter;
+    SkXfermode::F16Proc fWriter;
 
     typedef Sprite_4f INHERITED;
 };
 
 
 SkSpriteBlitter* SkSpriteBlitter::ChooseF16(const SkPixmap& source, const SkPaint& paint,
                                             SkTBlitterAllocator* allocator) {
     SkASSERT(allocator != nullptr);
 
     if (paint.getMaskFilter() != nullptr) {
@@ skipping 51 matching lines @@
     }
 
     switch (source.colorType()) {
         case kN32_SkColorType:
         case kRGBA_F16_SkColorType:
             return allocator->createT<Sprite_sRGB>(source, paint);
         default:
             return nullptr;
     }
 }