1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
|
/*
* Copyright 2014 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkBitmap.h"
#include "SkBlurImage_opts_SSE4.h"
#include "SkColorPriv.h"
#include "SkRect.h"
/* With the exception of the Android framework we always build the SSE4 functions
* and enable the caller to determine SSE4 support. However, for the Android framework,
* if the device does not support SSE4x then the compiler will not supply the required
* -msse4* option needed to build this file, so instead we provide a stub implementation.
*/
#if !defined(SK_BUILD_FOR_ANDROID_FRAMEWORK) || SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSE41
#include <smmintrin.h>
namespace {
enum BlurDirection {
kX, kY
};
/* Helper function to spread the components of a 32-bit integer into the
* lower 8 bits of each 32-bit element of an SSE register.
*/
inline __m128i expand(int a) {
const __m128i zero = _mm_setzero_si128();
// 0 0 0 0 0 0 0 0 0 0 0 0 A R G B
__m128i result = _mm_cvtsi32_si128(a);
// 0 0 0 0 0 0 0 0 0 A 0 R 0 G 0 B
result = _mm_unpacklo_epi8(result, zero);
// 0 0 0 A 0 0 0 R 0 0 0 G 0 0 0 B
return _mm_unpacklo_epi16(result, zero);
}
template<BlurDirection srcDirection, BlurDirection dstDirection>
void SkBoxBlur_SSE4(const SkPMColor* src, int srcStride, SkPMColor* dst, int kernelSize,
int leftOffset, int rightOffset, int width, int height)
{
const int rightBorder = SkMin32(rightOffset + 1, width);
const int srcStrideX = srcDirection == kX ? 1 : srcStride;
const int dstStrideX = dstDirection == kX ? 1 : height;
const int srcStrideY = srcDirection == kX ? srcStride : 1;
const int dstStrideY = dstDirection == kX ? width : 1;
const __m128i scale = _mm_set1_epi32((1 << 24) / kernelSize);
const __m128i half = _mm_set1_epi32(1 << 23);
const __m128i zero = _mm_setzero_si128();
for (int y = 0; y < height; ++y) {
__m128i sum = zero;
const SkPMColor* p = src;
for (int i = 0; i < rightBorder; ++i) {
sum = _mm_add_epi32(sum, expand(*p));
p += srcStrideX;
}
const SkPMColor* sptr = src;
SkColor* dptr = dst;
for (int x = 0; x < width; ++x) {
__m128i result = _mm_mullo_epi32(sum, scale);
// sumA*scale+.5 sumB*scale+.5 sumG*scale+.5 sumB*scale+.5
result = _mm_add_epi32(result, half);
// 0 0 0 A 0 0 0 R 0 0 0 G 0 0 0 B
result = _mm_srli_epi32(result, 24);
// 0 0 0 0 0 0 0 0 0 A 0 R 0 G 0 B
result = _mm_packs_epi32(result, zero);
// 0 0 0 0 0 0 0 0 0 0 0 0 A R G B
result = _mm_packus_epi16(result, zero);
*dptr = _mm_cvtsi128_si32(result);
if (x >= leftOffset) {
SkColor l = *(sptr - leftOffset * srcStrideX);
sum = _mm_sub_epi32(sum, expand(l));
}
if (x + rightOffset + 1 < width) {
SkColor r = *(sptr + (rightOffset + 1) * srcStrideX);
sum = _mm_add_epi32(sum, expand(r));
}
sptr += srcStrideX;
if (srcDirection == kY) {
_mm_prefetch(reinterpret_cast<const char*>(sptr + (rightOffset + 1) * srcStrideX),
_MM_HINT_T0);
}
dptr += dstStrideX;
}
src += srcStrideY;
dst += dstStrideY;
}
}
} // namespace
bool SkBoxBlurGetPlatformProcs_SSE4(SkBoxBlurProc* boxBlurX,
SkBoxBlurProc* boxBlurY,
SkBoxBlurProc* boxBlurXY,
SkBoxBlurProc* boxBlurYX) {
*boxBlurX = SkBoxBlur_SSE4<kX, kX>;
*boxBlurY = SkBoxBlur_SSE4<kY, kY>;
*boxBlurXY = SkBoxBlur_SSE4<kX, kY>;
*boxBlurYX = SkBoxBlur_SSE4<kY, kX>;
return true;
}
#else // !defined(SK_BUILD_FOR_ANDROID_FRAMEWORK) || SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSE41
bool SkBoxBlurGetPlatformProcs_SSE4(SkBoxBlurProc* boxBlurX,
SkBoxBlurProc* boxBlurY,
SkBoxBlurProc* boxBlurXY,
SkBoxBlurProc* boxBlurYX) {
sk_throw();
return false;
}
#endif
|
