1 // Copyright 2011 Google Inc. All Rights Reserved.
2 //
3 // Use of this source code is governed by a BSD-style license
4 // that can be found in the COPYING file in the root of the source
5 // tree. An additional intellectual property rights grant can be found
6 // in the file PATENTS. All contributing project authors may
7 // be found in the AUTHORS file in the root of the source tree.
8 // -----------------------------------------------------------------------------
9 //
10 // SSE41 version of YUV to RGB upsampling functions.
11 //
12 // Author: somnath@google.com (Somnath Banerjee)
13
14 #include "src/dsp/dsp.h"
15
16 #if defined(WEBP_USE_SSE41)
17
18 #include <assert.h>
19 #include <smmintrin.h>
20 #include <string.h>
21 #include "src/dsp/yuv.h"
22
23 #ifdef FANCY_UPSAMPLING
24
25 #if !defined(WEBP_REDUCE_CSP)
26
27 // We compute (9*a + 3*b + 3*c + d + 8) / 16 as follows
28 // u = (9*a + 3*b + 3*c + d + 8) / 16
29 // = (a + (a + 3*b + 3*c + d) / 8 + 1) / 2
30 // = (a + m + 1) / 2
31 // where m = (a + 3*b + 3*c + d) / 8
32 // = ((a + b + c + d) / 2 + b + c) / 4
33 //
34 // Let's say k = (a + b + c + d) / 4.
35 // We can compute k as
36 // k = (s + t + 1) / 2 - ((a^d) | (b^c) | (s^t)) & 1
37 // where s = (a + d + 1) / 2 and t = (b + c + 1) / 2
38 //
39 // Then m can be written as
40 // m = (k + t + 1) / 2 - (((b^c) & (s^t)) | (k^t)) & 1
41
42 // Computes out = (k + in + 1) / 2 - ((ij & (s^t)) | (k^in)) & 1
43 #define GET_M(ij, in, out) do { \
44 const __m128i tmp0 = _mm_avg_epu8(k, (in)); /* (k + in + 1) / 2 */ \
45 const __m128i tmp1 = _mm_and_si128((ij), st); /* (ij) & (s^t) */ \
46 const __m128i tmp2 = _mm_xor_si128(k, (in)); /* (k^in) */ \
47 const __m128i tmp3 = _mm_or_si128(tmp1, tmp2); /* ((ij) & (s^t)) | (k^in) */\
48 const __m128i tmp4 = _mm_and_si128(tmp3, one); /* & 1 -> lsb_correction */ \
49 (out) = _mm_sub_epi8(tmp0, tmp4); /* (k + in + 1) / 2 - lsb_correction */ \
50 } while (0)
51
52 // pack and store two alternating pixel rows
53 #define PACK_AND_STORE(a, b, da, db, out) do { \
54 const __m128i t_a = _mm_avg_epu8(a, da); /* (9a + 3b + 3c + d + 8) / 16 */ \
55 const __m128i t_b = _mm_avg_epu8(b, db); /* (3a + 9b + c + 3d + 8) / 16 */ \
56 const __m128i t_1 = _mm_unpacklo_epi8(t_a, t_b); \
57 const __m128i t_2 = _mm_unpackhi_epi8(t_a, t_b); \
58 _mm_store_si128(((__m128i*)(out)) + 0, t_1); \
59 _mm_store_si128(((__m128i*)(out)) + 1, t_2); \
60 } while (0)
61
62 // Loads 17 pixels each from rows r1 and r2 and generates 32 pixels.
63 #define UPSAMPLE_32PIXELS(r1, r2, out) { \
64 const __m128i one = _mm_set1_epi8(1); \
65 const __m128i a = _mm_loadu_si128((const __m128i*)&(r1)[0]); \
66 const __m128i b = _mm_loadu_si128((const __m128i*)&(r1)[1]); \
67 const __m128i c = _mm_loadu_si128((const __m128i*)&(r2)[0]); \
68 const __m128i d = _mm_loadu_si128((const __m128i*)&(r2)[1]); \
69 \
70 const __m128i s = _mm_avg_epu8(a, d); /* s = (a + d + 1) / 2 */ \
71 const __m128i t = _mm_avg_epu8(b, c); /* t = (b + c + 1) / 2 */ \
72 const __m128i st = _mm_xor_si128(s, t); /* st = s^t */ \
73 \
74 const __m128i ad = _mm_xor_si128(a, d); /* ad = a^d */ \
75 const __m128i bc = _mm_xor_si128(b, c); /* bc = b^c */ \
76 \
77 const __m128i t1 = _mm_or_si128(ad, bc); /* (a^d) | (b^c) */ \
78 const __m128i t2 = _mm_or_si128(t1, st); /* (a^d) | (b^c) | (s^t) */ \
79 const __m128i t3 = _mm_and_si128(t2, one); /* (a^d) | (b^c) | (s^t) & 1 */ \
80 const __m128i t4 = _mm_avg_epu8(s, t); \
81 const __m128i k = _mm_sub_epi8(t4, t3); /* k = (a + b + c + d) / 4 */ \
82 __m128i diag1, diag2; \
83 \
84 GET_M(bc, t, diag1); /* diag1 = (a + 3b + 3c + d) / 8 */ \
85 GET_M(ad, s, diag2); /* diag2 = (3a + b + c + 3d) / 8 */ \
86 \
87 /* pack the alternate pixels */ \
88 PACK_AND_STORE(a, b, diag1, diag2, (out) + 0); /* store top */ \
89 PACK_AND_STORE(c, d, diag2, diag1, (out) + 2 * 32); /* store bottom */ \
90 }
91
92 // Turn the macro into a function for reducing code-size when non-critical
Upsample32Pixels_SSE41(const uint8_t r1[],const uint8_t r2[],uint8_t * const out)93 static void Upsample32Pixels_SSE41(const uint8_t r1[], const uint8_t r2[],
94 uint8_t* const out) {
95 UPSAMPLE_32PIXELS(r1, r2, out);
96 }
97
98 #define UPSAMPLE_LAST_BLOCK(tb, bb, num_pixels, out) { \
99 uint8_t r1[17], r2[17]; \
100 memcpy(r1, (tb), (num_pixels)); \
101 memcpy(r2, (bb), (num_pixels)); \
102 /* replicate last byte */ \
103 memset(r1 + (num_pixels), r1[(num_pixels) - 1], 17 - (num_pixels)); \
104 memset(r2 + (num_pixels), r2[(num_pixels) - 1], 17 - (num_pixels)); \
105 /* using the shared function instead of the macro saves ~3k code size */ \
106 Upsample32Pixels_SSE41(r1, r2, out); \
107 }
108
109 #define CONVERT2RGB_32(FUNC, XSTEP, top_y, bottom_y, \
110 top_dst, bottom_dst, cur_x) do { \
111 FUNC##32_SSE41((top_y) + (cur_x), r_u, r_v, (top_dst) + (cur_x) * (XSTEP)); \
112 if ((bottom_y) != NULL) { \
113 FUNC##32_SSE41((bottom_y) + (cur_x), r_u + 64, r_v + 64, \
114 (bottom_dst) + (cur_x) * (XSTEP)); \
115 } \
116 } while (0)
117
118 #define SSE4_UPSAMPLE_FUNC(FUNC_NAME, FUNC, XSTEP) \
119 static void FUNC_NAME(const uint8_t* top_y, const uint8_t* bottom_y, \
120 const uint8_t* top_u, const uint8_t* top_v, \
121 const uint8_t* cur_u, const uint8_t* cur_v, \
122 uint8_t* top_dst, uint8_t* bottom_dst, int len) { \
123 int uv_pos, pos; \
124 /* 16byte-aligned array to cache reconstructed u and v */ \
125 uint8_t uv_buf[14 * 32 + 15] = { 0 }; \
126 uint8_t* const r_u = (uint8_t*)((uintptr_t)(uv_buf + 15) & ~15); \
127 uint8_t* const r_v = r_u + 32; \
128 \
129 assert(top_y != NULL); \
130 { /* Treat the first pixel in regular way */ \
131 const int u_diag = ((top_u[0] + cur_u[0]) >> 1) + 1; \
132 const int v_diag = ((top_v[0] + cur_v[0]) >> 1) + 1; \
133 const int u0_t = (top_u[0] + u_diag) >> 1; \
134 const int v0_t = (top_v[0] + v_diag) >> 1; \
135 FUNC(top_y[0], u0_t, v0_t, top_dst); \
136 if (bottom_y != NULL) { \
137 const int u0_b = (cur_u[0] + u_diag) >> 1; \
138 const int v0_b = (cur_v[0] + v_diag) >> 1; \
139 FUNC(bottom_y[0], u0_b, v0_b, bottom_dst); \
140 } \
141 } \
142 /* For UPSAMPLE_32PIXELS, 17 u/v values must be read-able for each block */ \
143 for (pos = 1, uv_pos = 0; pos + 32 + 1 <= len; pos += 32, uv_pos += 16) { \
144 UPSAMPLE_32PIXELS(top_u + uv_pos, cur_u + uv_pos, r_u); \
145 UPSAMPLE_32PIXELS(top_v + uv_pos, cur_v + uv_pos, r_v); \
146 CONVERT2RGB_32(FUNC, XSTEP, top_y, bottom_y, top_dst, bottom_dst, pos); \
147 } \
148 if (len > 1) { \
149 const int left_over = ((len + 1) >> 1) - (pos >> 1); \
150 uint8_t* const tmp_top_dst = r_u + 4 * 32; \
151 uint8_t* const tmp_bottom_dst = tmp_top_dst + 4 * 32; \
152 uint8_t* const tmp_top = tmp_bottom_dst + 4 * 32; \
153 uint8_t* const tmp_bottom = (bottom_y == NULL) ? NULL : tmp_top + 32; \
154 assert(left_over > 0); \
155 UPSAMPLE_LAST_BLOCK(top_u + uv_pos, cur_u + uv_pos, left_over, r_u); \
156 UPSAMPLE_LAST_BLOCK(top_v + uv_pos, cur_v + uv_pos, left_over, r_v); \
157 memcpy(tmp_top, top_y + pos, len - pos); \
158 if (bottom_y != NULL) memcpy(tmp_bottom, bottom_y + pos, len - pos); \
159 CONVERT2RGB_32(FUNC, XSTEP, tmp_top, tmp_bottom, tmp_top_dst, \
160 tmp_bottom_dst, 0); \
161 memcpy(top_dst + pos * (XSTEP), tmp_top_dst, (len - pos) * (XSTEP)); \
162 if (bottom_y != NULL) { \
163 memcpy(bottom_dst + pos * (XSTEP), tmp_bottom_dst, \
164 (len - pos) * (XSTEP)); \
165 } \
166 } \
167 }
168
169 // SSE4 variants of the fancy upsampler.
170 SSE4_UPSAMPLE_FUNC(UpsampleRgbLinePair_SSE41, VP8YuvToRgb, 3)
171 SSE4_UPSAMPLE_FUNC(UpsampleBgrLinePair_SSE41, VP8YuvToBgr, 3)
172
173 #undef GET_M
174 #undef PACK_AND_STORE
175 #undef UPSAMPLE_32PIXELS
176 #undef UPSAMPLE_LAST_BLOCK
177 #undef CONVERT2RGB
178 #undef CONVERT2RGB_32
179 #undef SSE4_UPSAMPLE_FUNC
180
181 #endif // WEBP_REDUCE_CSP
182
183 //------------------------------------------------------------------------------
184 // Entry point
185
186 extern WebPUpsampleLinePairFunc WebPUpsamplers[/* MODE_LAST */];
187
188 extern void WebPInitUpsamplersSSE41(void);
189
WebPInitUpsamplersSSE41(void)190 WEBP_TSAN_IGNORE_FUNCTION void WebPInitUpsamplersSSE41(void) {
191 #if !defined(WEBP_REDUCE_CSP)
192 WebPUpsamplers[MODE_RGB] = UpsampleRgbLinePair_SSE41;
193 WebPUpsamplers[MODE_BGR] = UpsampleBgrLinePair_SSE41;
194 #endif // WEBP_REDUCE_CSP
195 }
196
197 #endif // FANCY_UPSAMPLING
198
199 //------------------------------------------------------------------------------
200
201 extern WebPYUV444Converter WebPYUV444Converters[/* MODE_LAST */];
202 extern void WebPInitYUV444ConvertersSSE41(void);
203
204 #define YUV444_FUNC(FUNC_NAME, CALL, CALL_C, XSTEP) \
205 extern void CALL_C(const uint8_t* y, const uint8_t* u, const uint8_t* v, \
206 uint8_t* dst, int len); \
207 static void FUNC_NAME(const uint8_t* y, const uint8_t* u, const uint8_t* v, \
208 uint8_t* dst, int len) { \
209 int i; \
210 const int max_len = len & ~31; \
211 for (i = 0; i < max_len; i += 32) { \
212 CALL(y + i, u + i, v + i, dst + i * (XSTEP)); \
213 } \
214 if (i < len) { /* C-fallback */ \
215 CALL_C(y + i, u + i, v + i, dst + i * (XSTEP), len - i); \
216 } \
217 }
218
219 #if !defined(WEBP_REDUCE_CSP)
220 YUV444_FUNC(Yuv444ToRgb_SSE41, VP8YuvToRgb32_SSE41, WebPYuv444ToRgb_C, 3);
221 YUV444_FUNC(Yuv444ToBgr_SSE41, VP8YuvToBgr32_SSE41, WebPYuv444ToBgr_C, 3);
222 #endif // WEBP_REDUCE_CSP
223
WebPInitYUV444ConvertersSSE41(void)224 WEBP_TSAN_IGNORE_FUNCTION void WebPInitYUV444ConvertersSSE41(void) {
225 #if !defined(WEBP_REDUCE_CSP)
226 WebPYUV444Converters[MODE_RGB] = Yuv444ToRgb_SSE41;
227 WebPYUV444Converters[MODE_BGR] = Yuv444ToBgr_SSE41;
228 #endif // WEBP_REDUCE_CSP
229 }
230
231 #else
232
233 WEBP_DSP_INIT_STUB(WebPInitYUV444ConvertersSSE41)
234
235 #endif // WEBP_USE_SSE41
236
237 #if !(defined(FANCY_UPSAMPLING) && defined(WEBP_USE_SSE41))
238 WEBP_DSP_INIT_STUB(WebPInitUpsamplersSSE41)
239 #endif
240