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 (at) 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 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); 189 190 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 223 224 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
