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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 // SSE2 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_SSE2)
17 
18 #include <assert.h>
19 #include <emmintrin.h>
20 #include <string.h>
21 #include "src/dsp/yuv.h"
22 
23 #ifdef FANCY_UPSAMPLING
24 
25 // We compute (9*a + 3*b + 3*c + d + 8) / 16 as follows
26 // u = (9*a + 3*b + 3*c + d + 8) / 16
27 //   = (a + (a + 3*b + 3*c + d) / 8 + 1) / 2
28 //   = (a + m + 1) / 2
29 // where m = (a + 3*b + 3*c + d) / 8
30 //         = ((a + b + c + d) / 2 + b + c) / 4
31 //
32 // Let's say  k = (a + b + c + d) / 4.
33 // We can compute k as
34 // k = (s + t + 1) / 2 - ((a^d) | (b^c) | (s^t)) & 1
35 // where s = (a + d + 1) / 2 and t = (b + c + 1) / 2
36 //
37 // Then m can be written as
38 // m = (k + t + 1) / 2 - (((b^c) & (s^t)) | (k^t)) & 1
39 
40 // Computes out = (k + in + 1) / 2 - ((ij & (s^t)) | (k^in)) & 1
41 #define GET_M(ij, in, out) do {                                                \
42   const __m128i tmp0 = _mm_avg_epu8(k, (in));     /* (k + in + 1) / 2 */       \
43   const __m128i tmp1 = _mm_and_si128((ij), st);   /* (ij) & (s^t) */           \
44   const __m128i tmp2 = _mm_xor_si128(k, (in));    /* (k^in) */                 \
45   const __m128i tmp3 = _mm_or_si128(tmp1, tmp2);  /* ((ij) & (s^t)) | (k^in) */\
46   const __m128i tmp4 = _mm_and_si128(tmp3, one);  /* & 1 -> lsb_correction */  \
47   (out) = _mm_sub_epi8(tmp0, tmp4);    /* (k + in + 1) / 2 - lsb_correction */ \
48 } while (0)
49 
50 // pack and store two alternating pixel rows
51 #define PACK_AND_STORE(a, b, da, db, out) do {                                 \
52   const __m128i t_a = _mm_avg_epu8(a, da);  /* (9a + 3b + 3c +  d + 8) / 16 */ \
53   const __m128i t_b = _mm_avg_epu8(b, db);  /* (3a + 9b +  c + 3d + 8) / 16 */ \
54   const __m128i t_1 = _mm_unpacklo_epi8(t_a, t_b);                             \
55   const __m128i t_2 = _mm_unpackhi_epi8(t_a, t_b);                             \
56   _mm_store_si128(((__m128i*)(out)) + 0, t_1);                                 \
57   _mm_store_si128(((__m128i*)(out)) + 1, t_2);                                 \
58 } while (0)
59 
60 // Loads 17 pixels each from rows r1 and r2 and generates 32 pixels.
61 #define UPSAMPLE_32PIXELS(r1, r2, out) {                                       \
62   const __m128i one = _mm_set1_epi8(1);                                        \
63   const __m128i a = _mm_loadu_si128((const __m128i*)&(r1)[0]);                 \
64   const __m128i b = _mm_loadu_si128((const __m128i*)&(r1)[1]);                 \
65   const __m128i c = _mm_loadu_si128((const __m128i*)&(r2)[0]);                 \
66   const __m128i d = _mm_loadu_si128((const __m128i*)&(r2)[1]);                 \
67                                                                                \
68   const __m128i s = _mm_avg_epu8(a, d);        /* s = (a + d + 1) / 2 */       \
69   const __m128i t = _mm_avg_epu8(b, c);        /* t = (b + c + 1) / 2 */       \
70   const __m128i st = _mm_xor_si128(s, t);      /* st = s^t */                  \
71                                                                                \
72   const __m128i ad = _mm_xor_si128(a, d);      /* ad = a^d */                  \
73   const __m128i bc = _mm_xor_si128(b, c);      /* bc = b^c */                  \
74                                                                                \
75   const __m128i t1 = _mm_or_si128(ad, bc);     /* (a^d) | (b^c) */             \
76   const __m128i t2 = _mm_or_si128(t1, st);     /* (a^d) | (b^c) | (s^t) */     \
77   const __m128i t3 = _mm_and_si128(t2, one);   /* (a^d) | (b^c) | (s^t) & 1 */ \
78   const __m128i t4 = _mm_avg_epu8(s, t);                                       \
79   const __m128i k = _mm_sub_epi8(t4, t3);      /* k = (a + b + c + d) / 4 */   \
80   __m128i diag1, diag2;                                                        \
81                                                                                \
82   GET_M(bc, t, diag1);                  /* diag1 = (a + 3b + 3c + d) / 8 */    \
83   GET_M(ad, s, diag2);                  /* diag2 = (3a + b + c + 3d) / 8 */    \
84                                                                                \
85   /* pack the alternate pixels */                                              \
86   PACK_AND_STORE(a, b, diag1, diag2, (out) +      0);  /* store top */         \
87   PACK_AND_STORE(c, d, diag2, diag1, (out) + 2 * 32);  /* store bottom */      \
88 }
89 
90 // Turn the macro into a function for reducing code-size when non-critical
Upsample32Pixels_SSE2(const uint8_t r1[],const uint8_t r2[],uint8_t * const out)91 static void Upsample32Pixels_SSE2(const uint8_t r1[], const uint8_t r2[],
92                                   uint8_t* const out) {
93   UPSAMPLE_32PIXELS(r1, r2, out);
94 }
95 
96 #define UPSAMPLE_LAST_BLOCK(tb, bb, num_pixels, out) {                         \
97   uint8_t r1[17], r2[17];                                                      \
98   memcpy(r1, (tb), (num_pixels));                                              \
99   memcpy(r2, (bb), (num_pixels));                                              \
100   /* replicate last byte */                                                    \
101   memset(r1 + (num_pixels), r1[(num_pixels) - 1], 17 - (num_pixels));          \
102   memset(r2 + (num_pixels), r2[(num_pixels) - 1], 17 - (num_pixels));          \
103   /* using the shared function instead of the macro saves ~3k code size */     \
104   Upsample32Pixels_SSE2(r1, r2, out);                                          \
105 }
106 
107 #define CONVERT2RGB_32(FUNC, XSTEP, top_y, bottom_y,                           \
108                        top_dst, bottom_dst, cur_x) do {                        \
109   FUNC##32_SSE2((top_y) + (cur_x), r_u, r_v, (top_dst) + (cur_x) * (XSTEP));   \
110   if ((bottom_y) != NULL) {                                                    \
111     FUNC##32_SSE2((bottom_y) + (cur_x), r_u + 64, r_v + 64,                    \
112                   (bottom_dst) + (cur_x) * (XSTEP));                           \
113   }                                                                            \
114 } while (0)
115 
116 #define SSE2_UPSAMPLE_FUNC(FUNC_NAME, FUNC, XSTEP)                             \
117 static void FUNC_NAME(const uint8_t* top_y, const uint8_t* bottom_y,           \
118                       const uint8_t* top_u, const uint8_t* top_v,              \
119                       const uint8_t* cur_u, const uint8_t* cur_v,              \
120                       uint8_t* top_dst, uint8_t* bottom_dst, int len) {        \
121   int uv_pos, pos;                                                             \
122   /* 16byte-aligned array to cache reconstructed u and v */                    \
123   uint8_t uv_buf[14 * 32 + 15] = { 0 };                                        \
124   uint8_t* const r_u = (uint8_t*)((uintptr_t)(uv_buf + 15) & ~15);             \
125   uint8_t* const r_v = r_u + 32;                                               \
126                                                                                \
127   assert(top_y != NULL);                                                       \
128   {   /* Treat the first pixel in regular way */                               \
129     const int u_diag = ((top_u[0] + cur_u[0]) >> 1) + 1;                       \
130     const int v_diag = ((top_v[0] + cur_v[0]) >> 1) + 1;                       \
131     const int u0_t = (top_u[0] + u_diag) >> 1;                                 \
132     const int v0_t = (top_v[0] + v_diag) >> 1;                                 \
133     FUNC(top_y[0], u0_t, v0_t, top_dst);                                       \
134     if (bottom_y != NULL) {                                                    \
135       const int u0_b = (cur_u[0] + u_diag) >> 1;                               \
136       const int v0_b = (cur_v[0] + v_diag) >> 1;                               \
137       FUNC(bottom_y[0], u0_b, v0_b, bottom_dst);                               \
138     }                                                                          \
139   }                                                                            \
140   /* For UPSAMPLE_32PIXELS, 17 u/v values must be read-able for each block */  \
141   for (pos = 1, uv_pos = 0; pos + 32 + 1 <= len; pos += 32, uv_pos += 16) {    \
142     UPSAMPLE_32PIXELS(top_u + uv_pos, cur_u + uv_pos, r_u);                    \
143     UPSAMPLE_32PIXELS(top_v + uv_pos, cur_v + uv_pos, r_v);                    \
144     CONVERT2RGB_32(FUNC, XSTEP, top_y, bottom_y, top_dst, bottom_dst, pos);    \
145   }                                                                            \
146   if (len > 1) {                                                               \
147     const int left_over = ((len + 1) >> 1) - (pos >> 1);                       \
148     uint8_t* const tmp_top_dst = r_u + 4 * 32;                                 \
149     uint8_t* const tmp_bottom_dst = tmp_top_dst + 4 * 32;                      \
150     uint8_t* const tmp_top = tmp_bottom_dst + 4 * 32;                          \
151     uint8_t* const tmp_bottom = (bottom_y == NULL) ? NULL : tmp_top + 32;      \
152     assert(left_over > 0);                                                     \
153     UPSAMPLE_LAST_BLOCK(top_u + uv_pos, cur_u + uv_pos, left_over, r_u);       \
154     UPSAMPLE_LAST_BLOCK(top_v + uv_pos, cur_v + uv_pos, left_over, r_v);       \
155     memcpy(tmp_top, top_y + pos, len - pos);                                   \
156     if (bottom_y != NULL) memcpy(tmp_bottom, bottom_y + pos, len - pos);       \
157     CONVERT2RGB_32(FUNC, XSTEP, tmp_top, tmp_bottom, tmp_top_dst,              \
158          tmp_bottom_dst, 0);                                                   \
159     memcpy(top_dst + pos * (XSTEP), tmp_top_dst, (len - pos) * (XSTEP));       \
160     if (bottom_y != NULL) {                                                    \
161       memcpy(bottom_dst + pos * (XSTEP), tmp_bottom_dst,                       \
162              (len - pos) * (XSTEP));                                           \
163     }                                                                          \
164   }                                                                            \
165 }
166 
167 // SSE2 variants of the fancy upsampler.
168 SSE2_UPSAMPLE_FUNC(UpsampleRgbaLinePair_SSE2, VP8YuvToRgba, 4)
169 SSE2_UPSAMPLE_FUNC(UpsampleBgraLinePair_SSE2, VP8YuvToBgra, 4)
170 
171 #if !defined(WEBP_REDUCE_CSP)
172 SSE2_UPSAMPLE_FUNC(UpsampleRgbLinePair_SSE2,  VP8YuvToRgb,  3)
173 SSE2_UPSAMPLE_FUNC(UpsampleBgrLinePair_SSE2,  VP8YuvToBgr,  3)
174 SSE2_UPSAMPLE_FUNC(UpsampleArgbLinePair_SSE2, VP8YuvToArgb, 4)
175 SSE2_UPSAMPLE_FUNC(UpsampleRgba4444LinePair_SSE2, VP8YuvToRgba4444, 2)
176 SSE2_UPSAMPLE_FUNC(UpsampleRgb565LinePair_SSE2, VP8YuvToRgb565, 2)
177 #endif   // WEBP_REDUCE_CSP
178 
179 #undef GET_M
180 #undef PACK_AND_STORE
181 #undef UPSAMPLE_32PIXELS
182 #undef UPSAMPLE_LAST_BLOCK
183 #undef CONVERT2RGB
184 #undef CONVERT2RGB_32
185 #undef SSE2_UPSAMPLE_FUNC
186 
187 //------------------------------------------------------------------------------
188 // Entry point
189 
190 extern WebPUpsampleLinePairFunc WebPUpsamplers[/* MODE_LAST */];
191 
192 extern void WebPInitUpsamplersSSE2(void);
193 
WebPInitUpsamplersSSE2(void)194 WEBP_TSAN_IGNORE_FUNCTION void WebPInitUpsamplersSSE2(void) {
195   WebPUpsamplers[MODE_RGBA] = UpsampleRgbaLinePair_SSE2;
196   WebPUpsamplers[MODE_BGRA] = UpsampleBgraLinePair_SSE2;
197   WebPUpsamplers[MODE_rgbA] = UpsampleRgbaLinePair_SSE2;
198   WebPUpsamplers[MODE_bgrA] = UpsampleBgraLinePair_SSE2;
199 #if !defined(WEBP_REDUCE_CSP)
200   WebPUpsamplers[MODE_RGB]  = UpsampleRgbLinePair_SSE2;
201   WebPUpsamplers[MODE_BGR]  = UpsampleBgrLinePair_SSE2;
202   WebPUpsamplers[MODE_ARGB] = UpsampleArgbLinePair_SSE2;
203   WebPUpsamplers[MODE_Argb] = UpsampleArgbLinePair_SSE2;
204   WebPUpsamplers[MODE_RGB_565] = UpsampleRgb565LinePair_SSE2;
205   WebPUpsamplers[MODE_RGBA_4444] = UpsampleRgba4444LinePair_SSE2;
206   WebPUpsamplers[MODE_rgbA_4444] = UpsampleRgba4444LinePair_SSE2;
207 #endif   // WEBP_REDUCE_CSP
208 }
209 
210 #endif  // FANCY_UPSAMPLING
211 
212 //------------------------------------------------------------------------------
213 
214 extern WebPYUV444Converter WebPYUV444Converters[/* MODE_LAST */];
215 extern void WebPInitYUV444ConvertersSSE2(void);
216 
217 #define YUV444_FUNC(FUNC_NAME, CALL, CALL_C, XSTEP)                            \
218 extern void CALL_C(const uint8_t* y, const uint8_t* u, const uint8_t* v,       \
219                    uint8_t* dst, int len);                                     \
220 static void FUNC_NAME(const uint8_t* y, const uint8_t* u, const uint8_t* v,    \
221                       uint8_t* dst, int len) {                                 \
222   int i;                                                                       \
223   const int max_len = len & ~31;                                               \
224   for (i = 0; i < max_len; i += 32) {                                          \
225     CALL(y + i, u + i, v + i, dst + i * (XSTEP));                              \
226   }                                                                            \
227   if (i < len) {  /* C-fallback */                                             \
228     CALL_C(y + i, u + i, v + i, dst + i * (XSTEP), len - i);                   \
229   }                                                                            \
230 }
231 
232 YUV444_FUNC(Yuv444ToRgba_SSE2, VP8YuvToRgba32_SSE2, WebPYuv444ToRgba_C, 4);
233 YUV444_FUNC(Yuv444ToBgra_SSE2, VP8YuvToBgra32_SSE2, WebPYuv444ToBgra_C, 4);
234 #if !defined(WEBP_REDUCE_CSP)
235 YUV444_FUNC(Yuv444ToRgb_SSE2, VP8YuvToRgb32_SSE2, WebPYuv444ToRgb_C, 3);
236 YUV444_FUNC(Yuv444ToBgr_SSE2, VP8YuvToBgr32_SSE2, WebPYuv444ToBgr_C, 3);
237 YUV444_FUNC(Yuv444ToArgb_SSE2, VP8YuvToArgb32_SSE2, WebPYuv444ToArgb_C, 4)
238 YUV444_FUNC(Yuv444ToRgba4444_SSE2, VP8YuvToRgba444432_SSE2, \
239             WebPYuv444ToRgba4444_C, 2)
240 YUV444_FUNC(Yuv444ToRgb565_SSE2, VP8YuvToRgb56532_SSE2, WebPYuv444ToRgb565_C, 2)
241 #endif   // WEBP_REDUCE_CSP
242 
WebPInitYUV444ConvertersSSE2(void)243 WEBP_TSAN_IGNORE_FUNCTION void WebPInitYUV444ConvertersSSE2(void) {
244   WebPYUV444Converters[MODE_RGBA]      = Yuv444ToRgba_SSE2;
245   WebPYUV444Converters[MODE_BGRA]      = Yuv444ToBgra_SSE2;
246   WebPYUV444Converters[MODE_rgbA]      = Yuv444ToRgba_SSE2;
247   WebPYUV444Converters[MODE_bgrA]      = Yuv444ToBgra_SSE2;
248 #if !defined(WEBP_REDUCE_CSP)
249   WebPYUV444Converters[MODE_RGB]       = Yuv444ToRgb_SSE2;
250   WebPYUV444Converters[MODE_BGR]       = Yuv444ToBgr_SSE2;
251   WebPYUV444Converters[MODE_ARGB]      = Yuv444ToArgb_SSE2;
252   WebPYUV444Converters[MODE_RGBA_4444] = Yuv444ToRgba4444_SSE2;
253   WebPYUV444Converters[MODE_RGB_565]   = Yuv444ToRgb565_SSE2;
254   WebPYUV444Converters[MODE_Argb]      = Yuv444ToArgb_SSE2;
255   WebPYUV444Converters[MODE_rgbA_4444] = Yuv444ToRgba4444_SSE2;
256 #endif   // WEBP_REDUCE_CSP
257 }
258 
259 #else
260 
261 WEBP_DSP_INIT_STUB(WebPInitYUV444ConvertersSSE2)
262 
263 #endif  // WEBP_USE_SSE2
264 
265 #if !(defined(FANCY_UPSAMPLING) && defined(WEBP_USE_SSE2))
266 WEBP_DSP_INIT_STUB(WebPInitUpsamplersSSE2)
267 #endif
268