Re-proc SkBlitRow::Color32 for ARM.

src/opts/SkBlitRow_opts_arm_neon.cpp

 /*
  * Copyright 2012 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBlitRow_opts_arm_neon.h"
 
 #include "SkBlitMask.h"
@@ skipping 1712 matching lines @@
     S32A_Opaque_BlitRow32_neon_src_alpha,   // S32A_Opaque,
 #else
     S32A_Opaque_BlitRow32_neon,     // S32A_Opaque,
 #endif
 #ifdef SK_CPU_ARM32
     S32A_Blend_BlitRow32_neon        // S32A_Blend
 #else
     NULL
 #endif
 };
+
+#include "Sk4px.h"
+
+void sk_blitrow_color32_arm_neon(SkPMColor* dst, const SkPMColor* src, int count, SkPMColor color) {
+    // Until it becomes a little more reasonable to assume we'll be built with NEON,
+    // we copy our Sk4px implementation of SkBlitRow::Color32 here so it picks up NEON at runtime.
+    unsigned invA = 255 - SkGetPackedA32(color);
+    invA += invA >> 7;
+    SkASSERT(invA < 256);  // Our caller has already handled the alpha == 0 case.
+
+    Sk16h colorHighAndRound = Sk4px(color).widenHi() + Sk16h(128);
+    Sk16b invA_16x(invA);
+
+    Sk4px::MapSrc(count, dst, src, [&](const Sk4px& src4) -> Sk4px {
+        return src4.mulWiden(invA_16x).addNarrowHi(colorHighAndRound);
+    });
+}