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1 /* | |
2 * Copyright 2013 The Android Open Source Project | |
3 * | |
4 * Use of this source code is governed by a BSD-style license that can be | |
5 * found in the LICENSE file. | |
6 */ | |
7 | |
8 | |
9 #include "SkBitmap.h" | |
10 #include "SkColorPriv.h" | |
11 #include "SkBlurImage_opts_SSE2.h" | |
12 #include "SkRect.h" | |
13 | |
14 #include <emmintrin.h> | |
15 | |
16 namespace { | |
17 | |
18 enum BlurDirection { | |
19 kX, kY | |
20 }; | |
21 | |
22 /** | |
23 * Helper function to spread the components of a 32-bit integer into the | |
24 * lower 8 bits of each 32-bit element of an SSE register. | |
25 */ | |
26 | |
27 inline __m128i expand(int a) { | |
mtklein
2013/11/08 20:37:35
int -> uint32_t?
Stephen White
2013/11/08 20:47:45
The declaration for _mm_cvtsi32_si128 just takes a
mtklein
2013/11/08 20:49:22
SGTM
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28 const __m128i zero = _mm_setzero_si128(); | |
29 | |
30 // 0 0 0 0 0 0 0 0 0 0 0 0 A R G B | |
31 __m128i result = _mm_cvtsi32_si128(a); | |
32 | |
33 // 0 0 0 0 0 0 0 0 0 A 0 R G 0 B 0 | |
mtklein
2013/11/08 20:37:35
It's 0 G 0 B, right?
Stephen White
2013/11/08 20:47:45
Fixed, thanks.
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34 result = _mm_unpacklo_epi8(result, zero); | |
35 | |
36 // 0 0 0 A 0 0 0 R 0 0 0 G 0 0 0 B | |
37 return _mm_unpacklo_epi16(result, zero); | |
38 } | |
39 | |
40 template<BlurDirection srcDirection, BlurDirection dstDirection> | |
41 void SkBoxBlur_SSE2(const SkPMColor* src, int srcStride, SkPMColor* dst, int ker nelSize, | |
42 int leftOffset, int rightOffset, int width, int height) | |
43 { | |
44 const int rightBorder = SkMin32(rightOffset + 1, width); | |
45 const int srcStrideX = srcDirection == kX ? 1 : srcStride; | |
46 const int dstStrideX = dstDirection == kX ? 1 : height; | |
47 const int srcStrideY = srcDirection == kX ? srcStride : 1; | |
48 const int dstStrideY = dstDirection == kX ? width : 1; | |
49 const __m128i scale = _mm_set1_epi32((1 << 24) / kernelSize); | |
50 const __m128i half = _mm_set1_epi32(1 << 23); | |
51 const __m128i zero = _mm_setzero_si128(); | |
52 for (int y = 0; y < height; ++y) { | |
53 __m128i sum = zero; | |
54 const SkPMColor* p = src; | |
55 for (int i = 0; i < rightBorder; ++i) { | |
56 sum = _mm_add_epi32(sum, expand(*p)); | |
57 p += srcStrideX; | |
58 } | |
59 | |
60 const SkPMColor* sptr = src; | |
61 SkColor* dptr = dst; | |
62 for (int x = 0; x < width; ++x) { | |
63 #if 0 | |
64 // In SSE4.1, this would be | |
65 __m128i result = _mm_mullo_epi32(sum, scale); | |
66 #else | |
67 // But SSE2 has no PMULLUD, so we must do AG and RB separately. | |
68 __m128i tmp1 = _mm_mul_epu32(sum, scale); | |
69 __m128i tmp2 = _mm_mul_epu32(_mm_srli_si128(sum, 4), | |
70 _mm_srli_si128(scale, 4)); | |
71 __m128i result = _mm_unpacklo_epi32(_mm_shuffle_epi32(tmp1, _MM_SHUF FLE(0,0,2,0)), | |
72 _mm_shuffle_epi32(tmp2, _MM_SHUF FLE(0,0,2,0))); | |
73 #endif | |
74 // sumA*scale+.5 sumB*scale+.5 sumG*scale+.5 sumB*scale+.5 | |
75 result = _mm_add_epi32(result, half); | |
76 | |
77 // 0 0 0 A 0 0 0 R 0 0 0 G 0 0 0 B | |
78 result = _mm_srli_epi32(result, 24); | |
79 | |
80 // 0 0 0 0 0 0 0 0 0 A 0 R 0 G 0 B | |
81 result = _mm_packs_epi32(result, zero); | |
82 | |
83 // 0 0 0 0 0 0 0 0 0 0 0 0 A R G B | |
84 result = _mm_packus_epi16(result, zero); | |
85 *dptr = _mm_cvtsi128_si32(result); | |
86 if (x >= leftOffset) { | |
87 SkColor l = *(sptr - leftOffset * srcStrideX); | |
88 sum = _mm_sub_epi32(sum, expand(l)); | |
89 } | |
90 if (x + rightOffset + 1 < width) { | |
91 SkColor r = *(sptr + (rightOffset + 1) * srcStrideX); | |
92 sum = _mm_add_epi32(sum, expand(r)); | |
93 } | |
94 sptr += srcStrideX; | |
95 if (srcDirection == kY) { | |
96 _mm_prefetch(reinterpret_cast<const char*>(sptr + (rightOffset + 1) * srcStrideX), | |
97 _MM_HINT_T0); | |
98 } | |
99 dptr += dstStrideX; | |
100 } | |
101 src += srcStrideY; | |
102 dst += dstStrideY; | |
103 } | |
104 } | |
105 | |
106 }; | |
mtklein
2013/11/08 20:37:35
I just know something's going to yell at you for a
Stephen White
2013/11/08 20:47:45
Done.
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107 | |
108 bool SkBoxBlurGetPlatformProcs_SSE2(SkBoxBlurProc* boxBlurX, | |
109 SkBoxBlurProc* boxBlurY, | |
110 SkBoxBlurProc* boxBlurXY) { | |
111 *boxBlurX = SkBoxBlur_SSE2<kX, kX>; | |
112 *boxBlurY = SkBoxBlur_SSE2<kY, kY>; | |
113 *boxBlurXY = SkBoxBlur_SSE2<kX, kY>; | |
114 return true; | |
115 } | |
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