Add Sk4h_load4 for loading F16.

src/core/SkRasterPipelineBlitter.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 "SkBlitter.h"
 #include "SkColor.h"
 #include "SkColorFilter.h"
@@ skipping 213 matching lines @@
     auto ptr = st->ctx<uint16_t*>() + x;
     *ptr = to_565(r,g,b)[0];
 }
 
 // Load 4 F16 pixels.
 static void SK_VECTORCALL load_d_f16(SkRasterPipeline::Stage* st, size_t x,
                                      Sk4f  r, Sk4f  g, Sk4f  b, Sk4f  a,
                                      Sk4f dr, Sk4f dg, Sk4f db, Sk4f da) {
     auto ptr = st->ctx<const uint64_t*>() + x;
 
-    // TODO: This can be made a lot more efficient with platform-specific code.
-    auto p0 = SkHalfToFloat_finite(ptr[0]),
-         p1 = SkHalfToFloat_finite(ptr[1]),
-         p2 = SkHalfToFloat_finite(ptr[2]),
-         p3 = SkHalfToFloat_finite(ptr[3]);
-    dr = { p0[0], p1[0], p2[0], p3[0] };
-    dg = { p0[1], p1[1], p2[1], p3[1] };
-    db = { p0[2], p1[2], p2[2], p3[2] };
-    da = { p0[3], p1[3], p2[3], p3[3] };
+    Sk4h rh, gh, bh, ah;
+    Sk4h_load4(ptr, &rh, &gh, &bh, &ah);
+
+    dr = SkHalfToFloat_finite(rh);
+    dg = SkHalfToFloat_finite(gh);
+    db = SkHalfToFloat_finite(bh);
+    da = SkHalfToFloat_finite(ah);
 
     st->next(x, r,g,b,a, dr,dg,db,da);
 }
 
 // Load 1 F16 pixel.
 static void SK_VECTORCALL load_d_f16_1(SkRasterPipeline::Stage* st, size_t x,
                                        Sk4f  r, Sk4f  g, Sk4f  b, Sk4f  a,
                                        Sk4f dr, Sk4f dg, Sk4f db, Sk4f da) {
     auto ptr = st->ctx<const uint64_t*>() + x;
 
@@ skipping 241 matching lines @@
             case SkMask::kLCD16_Format:
                 p.append(lerp_lcd16, lerp_lcd16_1, mask.getAddrLCD16(x,y)-x);
                 break;
             default: break;
         }
         this->append_store(&p, dst);
 
         p.run(x, clip.width());
     }
 }