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comparison: gfx/skia/trunk/src/opts/SkBlurImage_opts_SSE2.cpp
gfx/skia/trunk/src/opts/SkBlurImage_opts_SSE2.cpp
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:5b0b454da8af |
|---|---|
| 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) { | |
| 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 0 G 0 B | |
| 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 kernelSize, | |
| 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_SHUFFLE(0,0,2,0)), | |
| 72 _mm_shuffle_epi32(tmp2, _MM_SHUFFLE(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 } // namespace | |
| 107 | |
| 108 bool SkBoxBlurGetPlatformProcs_SSE2(SkBoxBlurProc* boxBlurX, | |
| 109 SkBoxBlurProc* boxBlurY, | |
| 110 SkBoxBlurProc* boxBlurXY, | |
| 111 SkBoxBlurProc* boxBlurYX) { | |
| 112 *boxBlurX = SkBoxBlur_SSE2<kX, kX>; | |
| 113 *boxBlurY = SkBoxBlur_SSE2<kY, kY>; | |
| 114 *boxBlurXY = SkBoxBlur_SSE2<kX, kY>; | |
| 115 *boxBlurYX = SkBoxBlur_SSE2<kY, kX>; | |
| 116 return true; | |
| 117 } |
