-
-
Notifications
You must be signed in to change notification settings - Fork 55.6k
/
upsampling_neon.c
281 lines (249 loc) · 15.1 KB
/
upsampling_neon.c
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
270
271
272
273
274
275
276
277
278
279
280
281
// Copyright 2011 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 version of YUV to RGB upsampling functions.
//
// Author: mans@mansr.com (Mans Rullgard)
// Based on SSE code by: somnath@google.com (Somnath Banerjee)
#include "./dsp.h"
#if defined(WEBP_USE_NEON)
#include <assert.h>
#include <arm_neon.h>
#include <string.h>
#include "./neon.h"
#include "./yuv.h"
#ifdef FANCY_UPSAMPLING
//-----------------------------------------------------------------------------
// U/V upsampling
// Loads 9 pixels each from rows r1 and r2 and generates 16 pixels.
#define UPSAMPLE_16PIXELS(r1, r2, out) do { \
const uint8x8_t a = vld1_u8(r1 + 0); \
const uint8x8_t b = vld1_u8(r1 + 1); \
const uint8x8_t c = vld1_u8(r2 + 0); \
const uint8x8_t d = vld1_u8(r2 + 1); \
/* a + b + c + d */ \
const uint16x8_t ad = vaddl_u8(a, d); \
const uint16x8_t bc = vaddl_u8(b, c); \
const uint16x8_t abcd = vaddq_u16(ad, bc); \
/* 3a + b + c + 3d */ \
const uint16x8_t al = vaddq_u16(abcd, vshlq_n_u16(ad, 1)); \
/* a + 3b + 3c + d */ \
const uint16x8_t bl = vaddq_u16(abcd, vshlq_n_u16(bc, 1)); \
\
const uint8x8_t diag2 = vshrn_n_u16(al, 3); \
const uint8x8_t diag1 = vshrn_n_u16(bl, 3); \
\
const uint8x8_t A = vrhadd_u8(a, diag1); \
const uint8x8_t B = vrhadd_u8(b, diag2); \
const uint8x8_t C = vrhadd_u8(c, diag2); \
const uint8x8_t D = vrhadd_u8(d, diag1); \
\
uint8x8x2_t A_B, C_D; \
INIT_VECTOR2(A_B, A, B); \
INIT_VECTOR2(C_D, C, D); \
vst2_u8(out + 0, A_B); \
vst2_u8(out + 32, C_D); \
} while (0)
// Turn the macro into a function for reducing code-size when non-critical
static void Upsample16Pixels(const uint8_t *r1, const uint8_t *r2,
uint8_t *out) {
UPSAMPLE_16PIXELS(r1, r2, out);
}
#define UPSAMPLE_LAST_BLOCK(tb, bb, num_pixels, out) { \
uint8_t r1[9], r2[9]; \
memcpy(r1, (tb), (num_pixels)); \
memcpy(r2, (bb), (num_pixels)); \
/* replicate last byte */ \
memset(r1 + (num_pixels), r1[(num_pixels) - 1], 9 - (num_pixels)); \
memset(r2 + (num_pixels), r2[(num_pixels) - 1], 9 - (num_pixels)); \
Upsample16Pixels(r1, r2, out); \
}
//-----------------------------------------------------------------------------
// YUV->RGB conversion
// note: we represent the 33050 large constant as 32768 + 282
static const int16_t kCoeffs1[4] = { 19077, 26149, 6419, 13320 };
#define v255 vdup_n_u8(255)
#define STORE_Rgb(out, r, g, b) do { \
uint8x8x3_t r_g_b; \
INIT_VECTOR3(r_g_b, r, g, b); \
vst3_u8(out, r_g_b); \
} while (0)
#define STORE_Bgr(out, r, g, b) do { \
uint8x8x3_t b_g_r; \
INIT_VECTOR3(b_g_r, b, g, r); \
vst3_u8(out, b_g_r); \
} while (0)
#define STORE_Rgba(out, r, g, b) do { \
uint8x8x4_t r_g_b_v255; \
INIT_VECTOR4(r_g_b_v255, r, g, b, v255); \
vst4_u8(out, r_g_b_v255); \
} while (0)
#define STORE_Bgra(out, r, g, b) do { \
uint8x8x4_t b_g_r_v255; \
INIT_VECTOR4(b_g_r_v255, b, g, r, v255); \
vst4_u8(out, b_g_r_v255); \
} while (0)
#define STORE_Argb(out, r, g, b) do { \
uint8x8x4_t v255_r_g_b; \
INIT_VECTOR4(v255_r_g_b, v255, r, g, b); \
vst4_u8(out, v255_r_g_b); \
} while (0)
#if !defined(WEBP_SWAP_16BIT_CSP)
#define ZIP_U8(lo, hi) vzip_u8((lo), (hi))
#else
#define ZIP_U8(lo, hi) vzip_u8((hi), (lo))
#endif
#define STORE_Rgba4444(out, r, g, b) do { \
const uint8x8_t rg = vsri_n_u8(r, g, 4); /* shift g, insert r */ \
const uint8x8_t ba = vsri_n_u8(b, v255, 4); /* shift a, insert b */ \
const uint8x8x2_t rgba4444 = ZIP_U8(rg, ba); \
vst1q_u8(out, vcombine_u8(rgba4444.val[0], rgba4444.val[1])); \
} while (0)
#define STORE_Rgb565(out, r, g, b) do { \
const uint8x8_t rg = vsri_n_u8(r, g, 5); /* shift g and insert r */ \
const uint8x8_t g1 = vshl_n_u8(g, 3); /* pre-shift g: 3bits */ \
const uint8x8_t gb = vsri_n_u8(g1, b, 3); /* shift b and insert g */ \
const uint8x8x2_t rgb565 = ZIP_U8(rg, gb); \
vst1q_u8(out, vcombine_u8(rgb565.val[0], rgb565.val[1])); \
} while (0)
#define CONVERT8(FMT, XSTEP, N, src_y, src_uv, out, cur_x) do { \
int i; \
for (i = 0; i < N; i += 8) { \
const int off = ((cur_x) + i) * XSTEP; \
const uint8x8_t y = vld1_u8((src_y) + (cur_x) + i); \
const uint8x8_t u = vld1_u8((src_uv) + i + 0); \
const uint8x8_t v = vld1_u8((src_uv) + i + 16); \
const int16x8_t Y0 = vreinterpretq_s16_u16(vshll_n_u8(y, 7)); \
const int16x8_t U0 = vreinterpretq_s16_u16(vshll_n_u8(u, 7)); \
const int16x8_t V0 = vreinterpretq_s16_u16(vshll_n_u8(v, 7)); \
const int16x8_t Y1 = vqdmulhq_lane_s16(Y0, coeff1, 0); \
const int16x8_t R0 = vqdmulhq_lane_s16(V0, coeff1, 1); \
const int16x8_t G0 = vqdmulhq_lane_s16(U0, coeff1, 2); \
const int16x8_t G1 = vqdmulhq_lane_s16(V0, coeff1, 3); \
const int16x8_t B0 = vqdmulhq_n_s16(U0, 282); \
const int16x8_t R1 = vqaddq_s16(Y1, R_Rounder); \
const int16x8_t G2 = vqaddq_s16(Y1, G_Rounder); \
const int16x8_t B1 = vqaddq_s16(Y1, B_Rounder); \
const int16x8_t R2 = vqaddq_s16(R0, R1); \
const int16x8_t G3 = vqaddq_s16(G0, G1); \
const int16x8_t B2 = vqaddq_s16(B0, B1); \
const int16x8_t G4 = vqsubq_s16(G2, G3); \
const int16x8_t B3 = vqaddq_s16(B2, U0); \
const uint8x8_t R = vqshrun_n_s16(R2, YUV_FIX2); \
const uint8x8_t G = vqshrun_n_s16(G4, YUV_FIX2); \
const uint8x8_t B = vqshrun_n_s16(B3, YUV_FIX2); \
STORE_ ## FMT(out + off, R, G, B); \
} \
} while (0)
#define CONVERT1(FUNC, XSTEP, N, src_y, src_uv, rgb, cur_x) { \
int i; \
for (i = 0; i < N; i++) { \
const int off = ((cur_x) + i) * XSTEP; \
const int y = src_y[(cur_x) + i]; \
const int u = (src_uv)[i]; \
const int v = (src_uv)[i + 16]; \
FUNC(y, u, v, rgb + off); \
} \
}
#define CONVERT2RGB_8(FMT, XSTEP, top_y, bottom_y, uv, \
top_dst, bottom_dst, cur_x, len) { \
CONVERT8(FMT, XSTEP, len, top_y, uv, top_dst, cur_x); \
if (bottom_y != NULL) { \
CONVERT8(FMT, XSTEP, len, bottom_y, (uv) + 32, bottom_dst, cur_x); \
} \
}
#define CONVERT2RGB_1(FUNC, XSTEP, top_y, bottom_y, uv, \
top_dst, bottom_dst, cur_x, len) { \
CONVERT1(FUNC, XSTEP, len, top_y, uv, top_dst, cur_x); \
if (bottom_y != NULL) { \
CONVERT1(FUNC, XSTEP, len, bottom_y, (uv) + 32, bottom_dst, cur_x); \
} \
}
#define NEON_UPSAMPLE_FUNC(FUNC_NAME, FMT, XSTEP) \
static void FUNC_NAME(const uint8_t *top_y, const uint8_t *bottom_y, \
const uint8_t *top_u, const uint8_t *top_v, \
const uint8_t *cur_u, const uint8_t *cur_v, \
uint8_t *top_dst, uint8_t *bottom_dst, int len) { \
int block; \
/* 16 byte aligned array to cache reconstructed u and v */ \
uint8_t uv_buf[2 * 32 + 15]; \
uint8_t *const r_uv = (uint8_t*)((uintptr_t)(uv_buf + 15) & ~15); \
const int uv_len = (len + 1) >> 1; \
/* 9 pixels must be read-able for each block */ \
const int num_blocks = (uv_len - 1) >> 3; \
const int leftover = uv_len - num_blocks * 8; \
const int last_pos = 1 + 16 * num_blocks; \
\
const int u_diag = ((top_u[0] + cur_u[0]) >> 1) + 1; \
const int v_diag = ((top_v[0] + cur_v[0]) >> 1) + 1; \
\
const int16x4_t coeff1 = vld1_s16(kCoeffs1); \
const int16x8_t R_Rounder = vdupq_n_s16(-14234); \
const int16x8_t G_Rounder = vdupq_n_s16(8708); \
const int16x8_t B_Rounder = vdupq_n_s16(-17685); \
\
/* Treat the first pixel in regular way */ \
assert(top_y != NULL); \
{ \
const int u0 = (top_u[0] + u_diag) >> 1; \
const int v0 = (top_v[0] + v_diag) >> 1; \
VP8YuvTo ## FMT(top_y[0], u0, v0, top_dst); \
} \
if (bottom_y != NULL) { \
const int u0 = (cur_u[0] + u_diag) >> 1; \
const int v0 = (cur_v[0] + v_diag) >> 1; \
VP8YuvTo ## FMT(bottom_y[0], u0, v0, bottom_dst); \
} \
\
for (block = 0; block < num_blocks; ++block) { \
UPSAMPLE_16PIXELS(top_u, cur_u, r_uv); \
UPSAMPLE_16PIXELS(top_v, cur_v, r_uv + 16); \
CONVERT2RGB_8(FMT, XSTEP, top_y, bottom_y, r_uv, \
top_dst, bottom_dst, 16 * block + 1, 16); \
top_u += 8; \
cur_u += 8; \
top_v += 8; \
cur_v += 8; \
} \
\
UPSAMPLE_LAST_BLOCK(top_u, cur_u, leftover, r_uv); \
UPSAMPLE_LAST_BLOCK(top_v, cur_v, leftover, r_uv + 16); \
CONVERT2RGB_1(VP8YuvTo ## FMT, XSTEP, top_y, bottom_y, r_uv, \
top_dst, bottom_dst, last_pos, len - last_pos); \
}
// NEON variants of the fancy upsampler.
NEON_UPSAMPLE_FUNC(UpsampleRgbLinePair, Rgb, 3)
NEON_UPSAMPLE_FUNC(UpsampleBgrLinePair, Bgr, 3)
NEON_UPSAMPLE_FUNC(UpsampleRgbaLinePair, Rgba, 4)
NEON_UPSAMPLE_FUNC(UpsampleBgraLinePair, Bgra, 4)
NEON_UPSAMPLE_FUNC(UpsampleArgbLinePair, Argb, 4)
NEON_UPSAMPLE_FUNC(UpsampleRgba4444LinePair, Rgba4444, 2)
NEON_UPSAMPLE_FUNC(UpsampleRgb565LinePair, Rgb565, 2)
//------------------------------------------------------------------------------
// Entry point
extern WebPUpsampleLinePairFunc WebPUpsamplers[/* MODE_LAST */];
extern void WebPInitUpsamplersNEON(void);
WEBP_TSAN_IGNORE_FUNCTION void WebPInitUpsamplersNEON(void) {
WebPUpsamplers[MODE_RGB] = UpsampleRgbLinePair;
WebPUpsamplers[MODE_RGBA] = UpsampleRgbaLinePair;
WebPUpsamplers[MODE_BGR] = UpsampleBgrLinePair;
WebPUpsamplers[MODE_BGRA] = UpsampleBgraLinePair;
WebPUpsamplers[MODE_ARGB] = UpsampleArgbLinePair;
WebPUpsamplers[MODE_rgbA] = UpsampleRgbaLinePair;
WebPUpsamplers[MODE_bgrA] = UpsampleBgraLinePair;
WebPUpsamplers[MODE_Argb] = UpsampleArgbLinePair;
WebPUpsamplers[MODE_RGB_565] = UpsampleRgb565LinePair;
WebPUpsamplers[MODE_RGBA_4444] = UpsampleRgba4444LinePair;
WebPUpsamplers[MODE_rgbA_4444] = UpsampleRgba4444LinePair;
}
#endif // FANCY_UPSAMPLING
#endif // WEBP_USE_NEON
#if !(defined(FANCY_UPSAMPLING) && defined(WEBP_USE_NEON))
WEBP_DSP_INIT_STUB(WebPInitUpsamplersNEON)
#endif