Move screen capturers to remoting/capturer.

remoting/host/differ_block.cc

-// Copyright (c) 2012 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.
-
-#include "remoting/host/differ_block.h"
-
-#include "base/cpu.h"
-#include "build/build_config.h"
-#include "remoting/host/differ_block_internal.h"
-
-namespace remoting {
-
-int BlockDifference_C(const uint8* image1, const uint8* image2, int stride) {
-  int width_bytes = kBlockSize * kBytesPerPixel;
-
-  for (int y = 0; y < kBlockSize; y++) {
-    if (memcmp(image1, image2, width_bytes) != 0)
-      return 1;
-    image1 += stride;
-    image2 += stride;
-  }
-  return 0;
-}
-
-int BlockDifference(const uint8* image1, const uint8* image2, int stride) {
-  static int (*diff_proc)(const uint8*, const uint8*, int) = NULL;
-
-  if (!diff_proc) {
-#if defined(ARCH_CPU_ARM_FAMILY)
-    // For ARM processors, always use C version.
-    // TODO(hclam): Implement a NEON version.
-    diff_proc = &BlockDifference_C;
-#else
-    base::CPU cpu;
-    // For x86 processors, check if SSE2 is supported.
-    if (cpu.has_sse2() && kBlockSize == 32)
-      diff_proc = &BlockDifference_SSE2_W32;
-    else if (cpu.has_sse2() && kBlockSize == 16)
-      diff_proc = &BlockDifference_SSE2_W16;
-    else
-      diff_proc = &BlockDifference_C;
-#endif
-  }
-
-  return diff_proc(image1, image2, stride);
-}
-
-}  // namespace remoting