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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 #include <emmintrin.h> | |
9 #include "SkBitmap.h" | |
10 #include "SkBlurImage_opts_SSE2.h" | |
11 #include "SkColorPriv.h" | |
12 #include "SkRect.h" | |
13 | |
14 namespace { | |
15 enum BlurDirection { | |
16 kX, kY | |
17 }; | |
18 | |
19 /* Helper function to spread the components of a 32-bit integer into the | |
20 * lower 8 bits of each 32-bit element of an SSE register. | |
21 */ | |
22 inline __m128i expand(int a) { | |
23 const __m128i zero = _mm_setzero_si128(); | |
24 | |
25 // 0 0 0 0 0 0 0 0 0 0 0 0 A R G B | |
26 __m128i result = _mm_cvtsi32_si128(a); | |
27 | |
28 // 0 0 0 0 0 0 0 0 0 A 0 R 0 G 0 B | |
29 result = _mm_unpacklo_epi8(result, zero); | |
30 | |
31 // 0 0 0 A 0 0 0 R 0 0 0 G 0 0 0 B | |
32 return _mm_unpacklo_epi16(result, zero); | |
33 } | |
34 | |
35 template<BlurDirection srcDirection, BlurDirection dstDirection> | |
36 void SkBoxBlur_SSE2(const SkPMColor* src, int srcStride, SkPMColor* dst, int ker
nelSize, | |
37 int leftOffset, int rightOffset, int width, int height) | |
38 { | |
39 const int rightBorder = SkMin32(rightOffset + 1, width); | |
40 const int srcStrideX = srcDirection == kX ? 1 : srcStride; | |
41 const int dstStrideX = dstDirection == kX ? 1 : height; | |
42 const int srcStrideY = srcDirection == kX ? srcStride : 1; | |
43 const int dstStrideY = dstDirection == kX ? width : 1; | |
44 const __m128i scale = _mm_set1_epi32((1 << 24) / kernelSize); | |
45 const __m128i half = _mm_set1_epi32(1 << 23); | |
46 const __m128i zero = _mm_setzero_si128(); | |
47 for (int y = 0; y < height; ++y) { | |
48 __m128i sum = zero; | |
49 const SkPMColor* p = src; | |
50 for (int i = 0; i < rightBorder; ++i) { | |
51 sum = _mm_add_epi32(sum, expand(*p)); | |
52 p += srcStrideX; | |
53 } | |
54 | |
55 const SkPMColor* sptr = src; | |
56 SkColor* dptr = dst; | |
57 for (int x = 0; x < width; ++x) { | |
58 // SSE2 has no PMULLUD, so we must do AG and RB separately. | |
59 __m128i tmp1 = _mm_mul_epu32(sum, scale); | |
60 __m128i tmp2 = _mm_mul_epu32(_mm_srli_si128(sum, 4), | |
61 _mm_srli_si128(scale, 4)); | |
62 __m128i result = _mm_unpacklo_epi32(_mm_shuffle_epi32(tmp1, _MM_SHUF
FLE(0,0,2,0)), | |
63 _mm_shuffle_epi32(tmp2, _MM_SHUF
FLE(0,0,2,0))); | |
64 | |
65 // sumA*scale+.5 sumB*scale+.5 sumG*scale+.5 sumB*scale+.5 | |
66 result = _mm_add_epi32(result, half); | |
67 | |
68 // 0 0 0 A 0 0 0 R 0 0 0 G 0 0 0 B | |
69 result = _mm_srli_epi32(result, 24); | |
70 | |
71 // 0 0 0 0 0 0 0 0 0 A 0 R 0 G 0 B | |
72 result = _mm_packs_epi32(result, zero); | |
73 | |
74 // 0 0 0 0 0 0 0 0 0 0 0 0 A R G B | |
75 result = _mm_packus_epi16(result, zero); | |
76 *dptr = _mm_cvtsi128_si32(result); | |
77 if (x >= leftOffset) { | |
78 SkColor l = *(sptr - leftOffset * srcStrideX); | |
79 sum = _mm_sub_epi32(sum, expand(l)); | |
80 } | |
81 if (x + rightOffset + 1 < width) { | |
82 SkColor r = *(sptr + (rightOffset + 1) * srcStrideX); | |
83 sum = _mm_add_epi32(sum, expand(r)); | |
84 } | |
85 sptr += srcStrideX; | |
86 if (srcDirection == kY) { | |
87 _mm_prefetch(reinterpret_cast<const char*>(sptr + (rightOffset +
1) * srcStrideX), | |
88 _MM_HINT_T0); | |
89 } | |
90 dptr += dstStrideX; | |
91 } | |
92 src += srcStrideY; | |
93 dst += dstStrideY; | |
94 } | |
95 } | |
96 | |
97 } // namespace | |
98 | |
99 bool SkBoxBlurGetPlatformProcs_SSE2(SkBoxBlurProc* boxBlurX, | |
100 SkBoxBlurProc* boxBlurXY, | |
101 SkBoxBlurProc* boxBlurYX) { | |
102 *boxBlurX = SkBoxBlur_SSE2<kX, kX>; | |
103 *boxBlurXY = SkBoxBlur_SSE2<kX, kY>; | |
104 *boxBlurYX = SkBoxBlur_SSE2<kY, kX>; | |
105 return true; | |
106 } | |
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