NEON-ize RGBA to RGB code

third_party/WebKit/Source/platform/image-encoders/RGBAtoRGB.h

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef RGBAtoRGB_h
+#define RGBAtoRGB_h
+
+// TODO(cavalcantii): use regular macro, see https://crbug.com/673067.
+#ifdef __ARM_NEON__
+#include <arm_neon.h>
+#define RGBAtoRGB RGBAtoRGBNeon
+#else
+#define RGBAtoRGB RGBAtoRGBScalar
+#endif
+
+#include "platform/PlatformExport.h"
+
+namespace blink {
+PLATFORM_EXPORT void RGBAtoRGBScalar(const unsigned char* pixels,
+                                     unsigned pixelCount,
+                                     unsigned char* output);
+#ifdef __ARM_NEON__
+PLATFORM_EXPORT void RGBAtoRGBNeon(const unsigned char* input,
+                                   const unsigned pixelCount,
+                                   unsigned char* output);
+#endif
+
+}  // namespace blink
+
+#endif