remoting/host/differ_block_sse2.cc - Issue 11470028: Move screen capturers to remoting/capturer.

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Issue 11470028: Move screen capturers to remoting/capturer. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src

Patch Set: Created 8 years ago

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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.

2 // Use of this source code is governed by a BSD-style license that can be

3 // found in the LICENSE file.

4

5 #if defined(_MSC_VER)

6 #include <intrin.h>

7 #else

8 #include <mmintrin.h>

9 #include <emmintrin.h>

10 #endif

11

12 #include "remoting/host/differ_block.h"

13 #include "remoting/host/differ_block_internal.h"

14

15 namespace remoting {

16

17 extern int BlockDifference_SSE2_W16(const uint8* image1, const uint8* image2,

18 int stride) {

19 __m128i acc = _mm_setzero_si128();

20 __m128i v0;

21 __m128i v1;

22 __m128i sad;

23 for (int y = 0; y < kBlockSize; ++y) {

24 const __m128i* i1 = reinterpret_cast<const __m128i*>(image1);

25 const __m128i* i2 = reinterpret_cast<const __m128i*>(image2);

26 v0 = _mm_loadu_si128(i1);

27 v1 = _mm_loadu_si128(i2);

28 sad = _mm_sad_epu8(v0, v1);

29 acc = _mm_adds_epu16(acc, sad);

30 v0 = _mm_loadu_si128(i1 + 1);

31 v1 = _mm_loadu_si128(i2 + 1);

32 sad = _mm_sad_epu8(v0, v1);

33 acc = _mm_adds_epu16(acc, sad);

34 v0 = _mm_loadu_si128(i1 + 2);

35 v1 = _mm_loadu_si128(i2 + 2);

36 sad = _mm_sad_epu8(v0, v1);

37 acc = _mm_adds_epu16(acc, sad);

38 v0 = _mm_loadu_si128(i1 + 3);

39 v1 = _mm_loadu_si128(i2 + 3);

40 sad = _mm_sad_epu8(v0, v1);

41 acc = _mm_adds_epu16(acc, sad);

42

43 // This essential means sad = acc >> 64. We only care about the lower 16

44 // bits.

45 sad = _mm_shuffle_epi32(acc, 0xEE);

46 sad = _mm_adds_epu16(sad, acc);

47 int diff = _mm_cvtsi128_si32(sad);

48 if (diff)

49 return 1;

50 image1 += stride;

51 image2 += stride;

52 }

53 return 0;

54 }

55

56 extern int BlockDifference_SSE2_W32(const uint8* image1, const uint8* image2,

57 int stride) {

58 __m128i acc = _mm_setzero_si128();

59 __m128i v0;

60 __m128i v1;

61 __m128i sad;

62 for (int y = 0; y < kBlockSize; ++y) {

63 const __m128i* i1 = reinterpret_cast<const __m128i*>(image1);

64 const __m128i* i2 = reinterpret_cast<const __m128i*>(image2);

65 v0 = _mm_loadu_si128(i1);

66 v1 = _mm_loadu_si128(i2);

67 sad = _mm_sad_epu8(v0, v1);

68 acc = _mm_adds_epu16(acc, sad);

69 v0 = _mm_loadu_si128(i1 + 1);

70 v1 = _mm_loadu_si128(i2 + 1);

71 sad = _mm_sad_epu8(v0, v1);

72 acc = _mm_adds_epu16(acc, sad);

73 v0 = _mm_loadu_si128(i1 + 2);

74 v1 = _mm_loadu_si128(i2 + 2);

75 sad = _mm_sad_epu8(v0, v1);

76 acc = _mm_adds_epu16(acc, sad);

77 v0 = _mm_loadu_si128(i1 + 3);

78 v1 = _mm_loadu_si128(i2 + 3);

79 sad = _mm_sad_epu8(v0, v1);

80 acc = _mm_adds_epu16(acc, sad);

81 v0 = _mm_loadu_si128(i1 + 4);

82 v1 = _mm_loadu_si128(i2 + 4);

83 sad = _mm_sad_epu8(v0, v1);

84 acc = _mm_adds_epu16(acc, sad);

85 v0 = _mm_loadu_si128(i1 + 5);

86 v1 = _mm_loadu_si128(i2 + 5);

87 sad = _mm_sad_epu8(v0, v1);

88 acc = _mm_adds_epu16(acc, sad);

89 v0 = _mm_loadu_si128(i1 + 6);

90 v1 = _mm_loadu_si128(i2 + 6);

91 sad = _mm_sad_epu8(v0, v1);

92 acc = _mm_adds_epu16(acc, sad);

93 v0 = _mm_loadu_si128(i1 + 7);

94 v1 = _mm_loadu_si128(i2 + 7);

95 sad = _mm_sad_epu8(v0, v1);

96 acc = _mm_adds_epu16(acc, sad);

97

98 // This essential means sad = acc >> 64. We only care about the lower 16

99 // bits.

100 sad = _mm_shuffle_epi32(acc, 0xEE);

101 sad = _mm_adds_epu16(sad, acc);

102 int diff = _mm_cvtsi128_si32(sad);

103 if (diff)

104 return 1;

105 image1 += stride;

106 image2 += stride;

107 }

108 return 0;

109 }

110

111 } // namespace remoting

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