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
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
|
// Copyright 2014 Google Inc. All Rights Reserved.
//
// Use of this source code is governed by a BSD-style license
// that can be found in the COPYING file in the root of the source
// tree. An additional intellectual property rights grant can be found
// in the file PATENTS. All contributing project authors may
// be found in the AUTHORS file in the root of the source tree.
// -----------------------------------------------------------------------------
//
// NEON variant of methods for lossless decoder
//
// Author: Skal (pascal.massimino@gmail.com)
#include "./dsp.h"
#if defined(WEBP_USE_NEON)
#include <arm_neon.h>
#include "./lossless.h"
#include "./neon.h"
//------------------------------------------------------------------------------
// Colorspace conversion functions
#if !defined(WORK_AROUND_GCC)
// gcc 4.6.0 had some trouble (NDK-r9) with this code. We only use it for
// gcc-4.8.x at least.
static void ConvertBGRAToRGBA(const uint32_t* src,
int num_pixels, uint8_t* dst) {
const uint32_t* const end = src + (num_pixels & ~15);
for (; src < end; src += 16) {
uint8x16x4_t pixel = vld4q_u8((uint8_t*)src);
// swap B and R. (VSWP d0,d2 has no intrinsics equivalent!)
const uint8x16_t tmp = pixel.val[0];
pixel.val[0] = pixel.val[2];
pixel.val[2] = tmp;
vst4q_u8(dst, pixel);
dst += 64;
}
VP8LConvertBGRAToRGBA_C(src, num_pixels & 15, dst); // left-overs
}
static void ConvertBGRAToBGR(const uint32_t* src,
int num_pixels, uint8_t* dst) {
const uint32_t* const end = src + (num_pixels & ~15);
for (; src < end; src += 16) {
const uint8x16x4_t pixel = vld4q_u8((uint8_t*)src);
const uint8x16x3_t tmp = { { pixel.val[0], pixel.val[1], pixel.val[2] } };
vst3q_u8(dst, tmp);
dst += 48;
}
VP8LConvertBGRAToBGR_C(src, num_pixels & 15, dst); // left-overs
}
static void ConvertBGRAToRGB(const uint32_t* src,
int num_pixels, uint8_t* dst) {
const uint32_t* const end = src + (num_pixels & ~15);
for (; src < end; src += 16) {
const uint8x16x4_t pixel = vld4q_u8((uint8_t*)src);
const uint8x16x3_t tmp = { { pixel.val[2], pixel.val[1], pixel.val[0] } };
vst3q_u8(dst, tmp);
dst += 48;
}
VP8LConvertBGRAToRGB_C(src, num_pixels & 15, dst); // left-overs
}
#else // WORK_AROUND_GCC
// gcc-4.6.0 fallback
static const uint8_t kRGBAShuffle[8] = { 2, 1, 0, 3, 6, 5, 4, 7 };
static void ConvertBGRAToRGBA(const uint32_t* src,
int num_pixels, uint8_t* dst) {
const uint32_t* const end = src + (num_pixels & ~1);
const uint8x8_t shuffle = vld1_u8(kRGBAShuffle);
for (; src < end; src += 2) {
const uint8x8_t pixels = vld1_u8((uint8_t*)src);
vst1_u8(dst, vtbl1_u8(pixels, shuffle));
dst += 8;
}
VP8LConvertBGRAToRGBA_C(src, num_pixels & 1, dst); // left-overs
}
static const uint8_t kBGRShuffle[3][8] = {
{ 0, 1, 2, 4, 5, 6, 8, 9 },
{ 10, 12, 13, 14, 16, 17, 18, 20 },
{ 21, 22, 24, 25, 26, 28, 29, 30 }
};
static void ConvertBGRAToBGR(const uint32_t* src,
int num_pixels, uint8_t* dst) {
const uint32_t* const end = src + (num_pixels & ~7);
const uint8x8_t shuffle0 = vld1_u8(kBGRShuffle[0]);
const uint8x8_t shuffle1 = vld1_u8(kBGRShuffle[1]);
const uint8x8_t shuffle2 = vld1_u8(kBGRShuffle[2]);
for (; src < end; src += 8) {
uint8x8x4_t pixels;
INIT_VECTOR4(pixels,
vld1_u8((const uint8_t*)(src + 0)),
vld1_u8((const uint8_t*)(src + 2)),
vld1_u8((const uint8_t*)(src + 4)),
vld1_u8((const uint8_t*)(src + 6)));
vst1_u8(dst + 0, vtbl4_u8(pixels, shuffle0));
vst1_u8(dst + 8, vtbl4_u8(pixels, shuffle1));
vst1_u8(dst + 16, vtbl4_u8(pixels, shuffle2));
dst += 8 * 3;
}
VP8LConvertBGRAToBGR_C(src, num_pixels & 7, dst); // left-overs
}
static const uint8_t kRGBShuffle[3][8] = {
{ 2, 1, 0, 6, 5, 4, 10, 9 },
{ 8, 14, 13, 12, 18, 17, 16, 22 },
{ 21, 20, 26, 25, 24, 30, 29, 28 }
};
static void ConvertBGRAToRGB(const uint32_t* src,
int num_pixels, uint8_t* dst) {
const uint32_t* const end = src + (num_pixels & ~7);
const uint8x8_t shuffle0 = vld1_u8(kRGBShuffle[0]);
const uint8x8_t shuffle1 = vld1_u8(kRGBShuffle[1]);
const uint8x8_t shuffle2 = vld1_u8(kRGBShuffle[2]);
for (; src < end; src += 8) {
uint8x8x4_t pixels;
INIT_VECTOR4(pixels,
vld1_u8((const uint8_t*)(src + 0)),
vld1_u8((const uint8_t*)(src + 2)),
vld1_u8((const uint8_t*)(src + 4)),
vld1_u8((const uint8_t*)(src + 6)));
vst1_u8(dst + 0, vtbl4_u8(pixels, shuffle0));
vst1_u8(dst + 8, vtbl4_u8(pixels, shuffle1));
vst1_u8(dst + 16, vtbl4_u8(pixels, shuffle2));
dst += 8 * 3;
}
VP8LConvertBGRAToRGB_C(src, num_pixels & 7, dst); // left-overs
}
#endif // !WORK_AROUND_GCC
//------------------------------------------------------------------------------
// Subtract-Green Transform
// vtbl?_u8 are marked unavailable for iOS arm64 with Xcode < 6.3, use
// non-standard versions there.
#if defined(__APPLE__) && defined(__aarch64__) && \
defined(__apple_build_version__) && (__apple_build_version__< 6020037)
#define USE_VTBLQ
#endif
#ifdef USE_VTBLQ
// 255 = byte will be zeroed
static const uint8_t kGreenShuffle[16] = {
1, 255, 1, 255, 5, 255, 5, 255, 9, 255, 9, 255, 13, 255, 13, 255
};
static WEBP_INLINE uint8x16_t DoGreenShuffle(const uint8x16_t argb,
const uint8x16_t shuffle) {
return vcombine_u8(vtbl1q_u8(argb, vget_low_u8(shuffle)),
vtbl1q_u8(argb, vget_high_u8(shuffle)));
}
#else // !USE_VTBLQ
// 255 = byte will be zeroed
static const uint8_t kGreenShuffle[8] = { 1, 255, 1, 255, 5, 255, 5, 255 };
static WEBP_INLINE uint8x16_t DoGreenShuffle(const uint8x16_t argb,
const uint8x8_t shuffle) {
return vcombine_u8(vtbl1_u8(vget_low_u8(argb), shuffle),
vtbl1_u8(vget_high_u8(argb), shuffle));
}
#endif // USE_VTBLQ
static void AddGreenToBlueAndRed(uint32_t* argb_data, int num_pixels) {
const uint32_t* const end = argb_data + (num_pixels & ~3);
#ifdef USE_VTBLQ
const uint8x16_t shuffle = vld1q_u8(kGreenShuffle);
#else
const uint8x8_t shuffle = vld1_u8(kGreenShuffle);
#endif
for (; argb_data < end; argb_data += 4) {
const uint8x16_t argb = vld1q_u8((uint8_t*)argb_data);
const uint8x16_t greens = DoGreenShuffle(argb, shuffle);
vst1q_u8((uint8_t*)argb_data, vaddq_u8(argb, greens));
}
// fallthrough and finish off with plain-C
VP8LAddGreenToBlueAndRed_C(argb_data, num_pixels & 3);
}
//------------------------------------------------------------------------------
// Color Transform
static void TransformColorInverse(const VP8LMultipliers* const m,
uint32_t* argb_data, int num_pixels) {
// sign-extended multiplying constants, pre-shifted by 6.
#define CST(X) (((int16_t)(m->X << 8)) >> 6)
const int16_t rb[8] = {
CST(green_to_blue_), CST(green_to_red_),
CST(green_to_blue_), CST(green_to_red_),
CST(green_to_blue_), CST(green_to_red_),
CST(green_to_blue_), CST(green_to_red_)
};
const int16x8_t mults_rb = vld1q_s16(rb);
const int16_t b2[8] = {
0, CST(red_to_blue_), 0, CST(red_to_blue_),
0, CST(red_to_blue_), 0, CST(red_to_blue_),
};
const int16x8_t mults_b2 = vld1q_s16(b2);
#undef CST
#ifdef USE_VTBLQ
static const uint8_t kg0g0[16] = {
255, 1, 255, 1, 255, 5, 255, 5, 255, 9, 255, 9, 255, 13, 255, 13
};
const uint8x16_t shuffle = vld1q_u8(kg0g0);
#else
static const uint8_t k0g0g[8] = { 255, 1, 255, 1, 255, 5, 255, 5 };
const uint8x8_t shuffle = vld1_u8(k0g0g);
#endif
const uint32x4_t mask_ag = vdupq_n_u32(0xff00ff00u);
int i;
for (i = 0; i + 4 <= num_pixels; i += 4) {
const uint8x16_t in = vld1q_u8((uint8_t*)(argb_data + i));
const uint32x4_t a0g0 = vandq_u32(vreinterpretq_u32_u8(in), mask_ag);
// 0 g 0 g
const uint8x16_t greens = DoGreenShuffle(in, shuffle);
// x dr x db1
const int16x8_t A = vqdmulhq_s16(vreinterpretq_s16_u8(greens), mults_rb);
// x r' x b'
const int8x16_t B = vaddq_s8(vreinterpretq_s8_u8(in),
vreinterpretq_s8_s16(A));
// r' 0 b' 0
const int16x8_t C = vshlq_n_s16(vreinterpretq_s16_s8(B), 8);
// x db2 0 0
const int16x8_t D = vqdmulhq_s16(C, mults_b2);
// 0 x db2 0
const uint32x4_t E = vshrq_n_u32(vreinterpretq_u32_s16(D), 8);
// r' x b'' 0
const int8x16_t F = vaddq_s8(vreinterpretq_s8_u32(E),
vreinterpretq_s8_s16(C));
// 0 r' 0 b''
const uint16x8_t G = vshrq_n_u16(vreinterpretq_u16_s8(F), 8);
const uint32x4_t out = vorrq_u32(vreinterpretq_u32_u16(G), a0g0);
vst1q_u32(argb_data + i, out);
}
// Fall-back to C-version for left-overs.
VP8LTransformColorInverse_C(m, argb_data + i, num_pixels - i);
}
#undef USE_VTBLQ
//------------------------------------------------------------------------------
// Entry point
extern void VP8LDspInitNEON(void);
WEBP_TSAN_IGNORE_FUNCTION void VP8LDspInitNEON(void) {
VP8LConvertBGRAToRGBA = ConvertBGRAToRGBA;
VP8LConvertBGRAToBGR = ConvertBGRAToBGR;
VP8LConvertBGRAToRGB = ConvertBGRAToRGB;
VP8LAddGreenToBlueAndRed = AddGreenToBlueAndRed;
VP8LTransformColorInverse = TransformColorInverse;
}
#else // !WEBP_USE_NEON
WEBP_DSP_INIT_STUB(VP8LDspInitNEON)
#endif // WEBP_USE_NEON
|
