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| 1 /* | |
| 2 * Copyright 2014 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 "SkBitmap.h" | |
| 9 #include "SkBlurImage_opts_SSE4.h" | |
| 10 #include "SkColorPriv.h" | |
| 11 #include "SkRect.h" | |
| 12 | |
| 13 /* With the exception of the compilers that don't support it, we always build th
e | |
| 14 * SSE4 functions and enable the caller to determine SSE4 support. However for | |
| 15 * compilers that do not support SSE4x we provide a stub implementation. | |
| 16 */ | |
| 17 #if SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSE41 | |
| 18 | |
| 19 #include <smmintrin.h> | |
| 20 | |
| 21 namespace { | |
| 22 enum BlurDirection { | |
| 23 kX, kY | |
| 24 }; | |
| 25 | |
| 26 /* Helper function to spread the components of a 32-bit integer into the | |
| 27 * lower 8 bits of each 32-bit element of an SSE register. | |
| 28 */ | |
| 29 inline __m128i expand(int a) { | |
| 30 // ARGB -> 0000 0000 0000 ARGB | |
| 31 __m128i widened = _mm_cvtsi32_si128(a); | |
| 32 // SSE4.1 has xxxx xxxx xxxx ARGB -> 000A 000R 000G 000B as a one-stop-shop
instruction. | |
| 33 // It can even work from memory, so a smart compiler probably merges in the
_mm_cvtsi32_si128(). | |
| 34 return _mm_cvtepu8_epi32(widened); | |
| 35 } | |
| 36 | |
| 37 template<BlurDirection srcDirection, BlurDirection dstDirection> | |
| 38 void SkBoxBlur_SSE4(const SkPMColor* src, int srcStride, SkPMColor* dst, int ker
nelSize, | |
| 39 int leftOffset, int rightOffset, int width, int height) | |
| 40 { | |
| 41 const int rightBorder = SkMin32(rightOffset + 1, width); | |
| 42 const int srcStrideX = srcDirection == kX ? 1 : srcStride; | |
| 43 const int dstStrideX = dstDirection == kX ? 1 : height; | |
| 44 const int srcStrideY = srcDirection == kX ? srcStride : 1; | |
| 45 const int dstStrideY = dstDirection == kX ? width : 1; | |
| 46 const __m128i scale = _mm_set1_epi32((1 << 24) / kernelSize); | |
| 47 const __m128i half = _mm_set1_epi32(1 << 23); | |
| 48 for (int y = 0; y < height; ++y) { | |
| 49 __m128i sum = _mm_setzero_si128(); | |
| 50 const SkPMColor* p = src; | |
| 51 for (int i = 0; i < rightBorder; ++i) { | |
| 52 sum = _mm_add_epi32(sum, expand(*p)); | |
| 53 p += srcStrideX; | |
| 54 } | |
| 55 | |
| 56 const SkPMColor* sptr = src; | |
| 57 SkColor* dptr = dst; | |
| 58 for (int x = 0; x < width; ++x) { | |
| 59 // TODO(mtklein): We are working in 8.24 here. Drop to 8.8 when the
kernel is narrow? | |
| 60 | |
| 61 // Multiply each component by scale (i.e. divide by kernel size) and
add half to round. | |
| 62 __m128i result = _mm_mullo_epi32(sum, scale); | |
| 63 result = _mm_add_epi32(result, half); | |
| 64 | |
| 65 // Now pack the top byte of each 32-bit lane back down into one 32-b
it color. | |
| 66 // Axxx Rxxx Gxxx Bxxx -> xxxx xxxx xxxx ARGB | |
| 67 const char _ = 0; // Don't care what ends up in these bytes. Happe
ns to be byte 0. | |
| 68 result = _mm_shuffle_epi8(result, _mm_set_epi8(_,_,_,_, _,_,_,_, _,_
,_,_, 15,11,7,3)); | |
| 69 | |
| 70 *dptr = _mm_cvtsi128_si32(result); | |
| 71 | |
| 72 // TODO(mtklein): experiment with breaking this loop into 3 parts | |
| 73 if (x >= leftOffset) { | |
| 74 SkColor l = *(sptr - leftOffset * srcStrideX); | |
| 75 sum = _mm_sub_epi32(sum, expand(l)); | |
| 76 } | |
| 77 if (x + rightOffset + 1 < width) { | |
| 78 SkColor r = *(sptr + (rightOffset + 1) * srcStrideX); | |
| 79 sum = _mm_add_epi32(sum, expand(r)); | |
| 80 } | |
| 81 sptr += srcStrideX; | |
| 82 if (srcDirection == kY) { | |
| 83 // TODO(mtklein): experiment with moving this prefetch forward | |
| 84 _mm_prefetch(reinterpret_cast<const char*>(sptr + (rightOffset +
1) * srcStrideX), | |
| 85 _MM_HINT_T0); | |
| 86 } | |
| 87 dptr += dstStrideX; | |
| 88 } | |
| 89 src += srcStrideY; | |
| 90 dst += dstStrideY; | |
| 91 } | |
| 92 } | |
| 93 | |
| 94 } // namespace | |
| 95 | |
| 96 bool SkBoxBlurGetPlatformProcs_SSE4(SkBoxBlurProc* boxBlurX, | |
| 97 SkBoxBlurProc* boxBlurXY, | |
| 98 SkBoxBlurProc* boxBlurYX) { | |
| 99 *boxBlurX = SkBoxBlur_SSE4<kX, kX>; | |
| 100 *boxBlurXY = SkBoxBlur_SSE4<kX, kY>; | |
| 101 *boxBlurYX = SkBoxBlur_SSE4<kY, kX>; | |
| 102 return true; | |
| 103 } | |
| 104 | |
| 105 #else // SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSE41 | |
| 106 | |
| 107 bool SkBoxBlurGetPlatformProcs_SSE4(SkBoxBlurProc* boxBlurX, | |
| 108 SkBoxBlurProc* boxBlurXY, | |
| 109 SkBoxBlurProc* boxBlurYX) { | |
| 110 sk_throw(); | |
| 111 return false; | |
| 112 } | |
| 113 | |
| 114 | |
| 115 #endif | |
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Chromium Code Reviews
Issue 1264103004:
Port SkBlurImage opts to SkOpts. (Closed)
Base URL: https://skia.googlesource.com/skia.git@master