Move rect_memcopy from helper to global static.

src/core/SkConfig8888.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkPixelInfo_DEFINED
 #define SkPixelInfo_DEFINED
 
@@ skipping 16 matching lines @@
 };
 
 struct SkSrcPixelInfo : SkPixelInfo {
     const void* fPixels;
 
     // Guaranteed to work even if src.fPixels and dst.fPixels are the same
     // (but not if they overlap partially)
     bool convertPixelsTo(SkDstPixelInfo* dst, int width, int height) const;
 };
 
+static inline void SkRectMemcpy(void* dst, size_t dstRB, const void* src, size_t srcRB,
+                                size_t bytesPerRow, int rowCount) {
+    SkASSERT(bytesPerRow <= srcRB);
+    SkASSERT(bytesPerRow <= dstRB);
+    for (int i = 0; i < rowCount; ++i) {
+        memcpy(dst, src, bytesPerRow);
+        dst = (char*)dst + dstRB;
+        src = (const char*)src + srcRB;
+    }
+}
+
 #endif