[WebRTC] Add ScreenCapturerDifferWrapper to share Differ across ScreenCapturers

webrtc/modules/desktop_capture/differ_block_sse2.cc

Index: webrtc/modules/desktop_capture/differ_block_sse2.cc
diff --git a/webrtc/modules/desktop_capture/differ_block_sse2.cc b/webrtc/modules/desktop_capture/differ_block_sse2.cc
deleted file mode 100644
index 8d35df2226566b59958a51dd19188e9f35fae10b..0000000000000000000000000000000000000000
--- a/webrtc/modules/desktop_capture/differ_block_sse2.cc
+++ /dev/null
@@ -1,120 +0,0 @@
-/*
- *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#include "webrtc/modules/desktop_capture/differ_block_sse2.h"
-
-#if defined(_MSC_VER)
-#include <intrin.h>
-#else
-#include <mmintrin.h>
-#include <emmintrin.h>
-#endif
-
-#include "webrtc/modules/desktop_capture/differ_block.h"
-
-namespace webrtc {
-
-extern bool BlockDifference_SSE2_W16(const uint8_t* image1,
-                                     const uint8_t* image2,
-                                     int stride) {
-  __m128i acc = _mm_setzero_si128();
-  __m128i v0;
-  __m128i v1;
-  __m128i sad;
-  for (int y = 0; y < kBlockSize; ++y) {
-    const __m128i* i1 = reinterpret_cast<const __m128i*>(image1);
-    const __m128i* i2 = reinterpret_cast<const __m128i*>(image2);
-    v0 = _mm_loadu_si128(i1);
-    v1 = _mm_loadu_si128(i2);
-    sad = _mm_sad_epu8(v0, v1);
-    acc = _mm_adds_epu16(acc, sad);
-    v0 = _mm_loadu_si128(i1 + 1);
-    v1 = _mm_loadu_si128(i2 + 1);
-    sad = _mm_sad_epu8(v0, v1);
-    acc = _mm_adds_epu16(acc, sad);
-    v0 = _mm_loadu_si128(i1 + 2);
-    v1 = _mm_loadu_si128(i2 + 2);
-    sad = _mm_sad_epu8(v0, v1);
-    acc = _mm_adds_epu16(acc, sad);
-    v0 = _mm_loadu_si128(i1 + 3);
-    v1 = _mm_loadu_si128(i2 + 3);
-    sad = _mm_sad_epu8(v0, v1);
-    acc = _mm_adds_epu16(acc, sad);
-
-    // This essential means sad = acc >> 64. We only care about the lower 16
-    // bits.
-    sad = _mm_shuffle_epi32(acc, 0xEE);
-    sad = _mm_adds_epu16(sad, acc);
-    int diff = _mm_cvtsi128_si32(sad);
-    if (diff)
-      return true;
-    image1 += stride;
-    image2 += stride;
-  }
-  return false;
-}
-
-extern bool BlockDifference_SSE2_W32(const uint8_t* image1,
-                                     const uint8_t* image2,
-                                     int stride) {
-  __m128i acc = _mm_setzero_si128();
-  __m128i v0;
-  __m128i v1;
-  __m128i sad;
-  for (int y = 0; y < kBlockSize; ++y) {
-    const __m128i* i1 = reinterpret_cast<const __m128i*>(image1);
-    const __m128i* i2 = reinterpret_cast<const __m128i*>(image2);
-    v0 = _mm_loadu_si128(i1);
-    v1 = _mm_loadu_si128(i2);
-    sad = _mm_sad_epu8(v0, v1);
-    acc = _mm_adds_epu16(acc, sad);
-    v0 = _mm_loadu_si128(i1 + 1);
-    v1 = _mm_loadu_si128(i2 + 1);
-    sad = _mm_sad_epu8(v0, v1);
-    acc = _mm_adds_epu16(acc, sad);
-    v0 = _mm_loadu_si128(i1 + 2);
-    v1 = _mm_loadu_si128(i2 + 2);
-    sad = _mm_sad_epu8(v0, v1);
-    acc = _mm_adds_epu16(acc, sad);
-    v0 = _mm_loadu_si128(i1 + 3);
-    v1 = _mm_loadu_si128(i2 + 3);
-    sad = _mm_sad_epu8(v0, v1);
-    acc = _mm_adds_epu16(acc, sad);
-    v0 = _mm_loadu_si128(i1 + 4);
-    v1 = _mm_loadu_si128(i2 + 4);
-    sad = _mm_sad_epu8(v0, v1);
-    acc = _mm_adds_epu16(acc, sad);
-    v0 = _mm_loadu_si128(i1 + 5);
-    v1 = _mm_loadu_si128(i2 + 5);
-    sad = _mm_sad_epu8(v0, v1);
-    acc = _mm_adds_epu16(acc, sad);
-    v0 = _mm_loadu_si128(i1 + 6);
-    v1 = _mm_loadu_si128(i2 + 6);
-    sad = _mm_sad_epu8(v0, v1);
-    acc = _mm_adds_epu16(acc, sad);
-    v0 = _mm_loadu_si128(i1 + 7);
-    v1 = _mm_loadu_si128(i2 + 7);
-    sad = _mm_sad_epu8(v0, v1);
-    acc = _mm_adds_epu16(acc, sad);
-
-    // This essential means sad = acc >> 64. We only care about the lower 16
-    // bits.
-    sad = _mm_shuffle_epi32(acc, 0xEE);
-    sad = _mm_adds_epu16(sad, acc);
-    int diff = _mm_cvtsi128_si32(sad);
-    if (diff)
-      return true;
-    image1 += stride;
-    image2 += stride;
-  }
-  return false;
-}
-
-}  // namespace webrtc