4f linear gradient shader blitters

src/core/SkPixmap.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkColorPriv.h"
 #include "SkConfig8888.h"
 #include "SkData.h"
@@ skipping 193 matching lines @@
         }
         default:
             return false; // no change, so don't call notifyPixelsChanged()
     }
     return true;
 }
 
 #include "SkNx.h"
 #include "SkHalf.h"
 
-static void sk_memset64(uint64_t dst[], uint64_t value, int count) {
-    for (int i = 0; i < count; ++i) {
-        dst[i] = value;
-    }
-}
-
 bool SkPixmap::erase(const SkColor4f& origColor, const SkIRect* subset) const {
     SkPixmap pm;
     if (subset) {
         if (!this->extractSubset(&pm, *subset)) {
             return false;
         }
     } else {
         pm = *this;
     }
 
@@ skipping 92 matching lines @@
     if (!fStorage) {
         return nullptr;
     }
 
     auto data = SkData::MakeFromMalloc(fStorage, this->getSafeSize());
     fStorage = nullptr;
     this->INHERITED::reset();
 
     return data.release();
 }