Hamsalekha S | 8d3d303 | 2015-03-13 21:24:58 +0530 | [diff] [blame] | 1 | /****************************************************************************** |
| 2 | * |
| 3 | * Copyright (C) 2015 The Android Open Source Project |
| 4 | * |
| 5 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | * you may not use this file except in compliance with the License. |
| 7 | * You may obtain a copy of the License at: |
| 8 | * |
| 9 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | * |
| 11 | * Unless required by applicable law or agreed to in writing, software |
| 12 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | * See the License for the specific language governing permissions and |
| 15 | * limitations under the License. |
| 16 | * |
| 17 | ***************************************************************************** |
| 18 | * Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore |
| 19 | */ |
| 20 | /** |
| 21 | ******************************************************************************* |
| 22 | * @file |
| 23 | * ih264_inter_pred_filters.c |
| 24 | * |
| 25 | * @brief |
| 26 | * Contains function definitions for inter prediction interpolation filters |
| 27 | * |
| 28 | * @author |
| 29 | * Ittiam |
| 30 | * |
| 31 | * @par List of Functions: |
| 32 | * - ih264_inter_pred_luma_copy |
| 33 | * - ih264_interleave_copy |
| 34 | * - ih264_inter_pred_luma_horz |
| 35 | * - ih264_inter_pred_luma_vert |
| 36 | * - ih264_inter_pred_luma_horz_hpel_vert_hpel |
| 37 | * - ih264_inter_pred_luma_horz_qpel |
| 38 | * - ih264_inter_pred_luma_vert_qpel |
| 39 | * - ih264_inter_pred_luma_horz_qpel_vert_qpel |
| 40 | * - ih264_inter_pred_luma_horz_hpel_vert_qpel |
| 41 | * - ih264_inter_pred_luma_horz_qpel_vert_hpel |
| 42 | * - ih264_inter_pred_luma_bilinear |
| 43 | * - ih264_inter_pred_chroma |
| 44 | * |
| 45 | * @remarks |
| 46 | * None |
| 47 | * |
| 48 | ******************************************************************************* |
| 49 | */ |
| 50 | |
| 51 | /*****************************************************************************/ |
| 52 | /* File Includes */ |
| 53 | /*****************************************************************************/ |
| 54 | |
| 55 | /* User include files */ |
| 56 | #include "ih264_typedefs.h" |
| 57 | #include "ih264_macros.h" |
| 58 | #include "ih264_platform_macros.h" |
| 59 | #include "ih264_inter_pred_filters.h" |
| 60 | |
| 61 | |
| 62 | /*****************************************************************************/ |
| 63 | /* Constant Data variables */ |
| 64 | /*****************************************************************************/ |
| 65 | |
| 66 | /* coefficients for 6 tap filtering*/ |
| 67 | const WORD32 ih264_g_six_tap[3] ={1,-5,20}; |
| 68 | |
| 69 | |
| 70 | /*****************************************************************************/ |
| 71 | /* Function definitions . */ |
| 72 | /*****************************************************************************/ |
| 73 | /** |
| 74 | ******************************************************************************* |
| 75 | * |
| 76 | * @brief |
| 77 | * Interprediction luma function for copy |
| 78 | * |
| 79 | * @par Description: |
| 80 | * Copies the array of width 'wd' and height 'ht' from the location pointed |
| 81 | * by 'src' to the location pointed by 'dst' |
| 82 | * |
| 83 | * @param[in] pu1_src |
| 84 | * UWORD8 pointer to the source |
| 85 | * |
| 86 | * @param[out] pu1_dst |
| 87 | * UWORD8 pointer to the destination |
| 88 | * |
| 89 | * @param[in] src_strd |
| 90 | * integer source stride |
| 91 | * |
| 92 | * @param[in] dst_strd |
| 93 | * integer destination stride |
| 94 | * |
| 95 | * |
| 96 | * @param[in] ht |
| 97 | * integer height of the array |
| 98 | * |
| 99 | * @param[in] wd |
| 100 | * integer width of the array |
| 101 | * |
| 102 | * @returns |
| 103 | * |
| 104 | * @remarks |
| 105 | * None |
| 106 | * |
| 107 | ******************************************************************************* |
| 108 | */ |
| 109 | |
| 110 | void ih264_inter_pred_luma_copy(UWORD8 *pu1_src, |
| 111 | UWORD8 *pu1_dst, |
| 112 | WORD32 src_strd, |
| 113 | WORD32 dst_strd, |
| 114 | WORD32 ht, |
| 115 | WORD32 wd, |
| 116 | UWORD8* pu1_tmp, |
| 117 | WORD32 dydx) |
| 118 | { |
| 119 | WORD32 row, col; |
| 120 | UNUSED(pu1_tmp); |
| 121 | UNUSED(dydx); |
| 122 | for(row = 0; row < ht; row++) |
| 123 | { |
| 124 | for(col = 0; col < wd; col++) |
| 125 | { |
| 126 | pu1_dst[col] = pu1_src[col]; |
| 127 | } |
| 128 | |
| 129 | pu1_src += src_strd; |
| 130 | pu1_dst += dst_strd; |
| 131 | } |
| 132 | } |
| 133 | |
| 134 | /** |
| 135 | ******************************************************************************* |
| 136 | * |
| 137 | * @brief |
| 138 | * Fucntion for copying to an interleaved destination |
| 139 | * |
| 140 | * @par Description: |
| 141 | * Copies the array of width 'wd' and height 'ht' from the location pointed |
| 142 | * by 'src' to the location pointed by 'dst' |
| 143 | * |
| 144 | * @param[in] pu1_src |
| 145 | * UWORD8 pointer to the source |
| 146 | * |
| 147 | * @param[out] pu1_dst |
| 148 | * UWORD8 pointer to the destination |
| 149 | * |
| 150 | * @param[in] src_strd |
| 151 | * integer source stride |
| 152 | * |
| 153 | * @param[in] dst_strd |
| 154 | * integer destination stride |
| 155 | * |
| 156 | * @param[in] ht |
| 157 | * integer height of the array |
| 158 | * |
| 159 | * @param[in] wd |
| 160 | * integer width of the array |
| 161 | * |
| 162 | * @returns |
| 163 | * |
| 164 | * @remarks |
| 165 | * The alternate elements of src will be copied to alternate locations in dsr |
| 166 | * Other locations are not touched |
| 167 | * |
| 168 | ******************************************************************************* |
| 169 | */ |
| 170 | void ih264_interleave_copy(UWORD8 *pu1_src, |
| 171 | UWORD8 *pu1_dst, |
| 172 | WORD32 src_strd, |
| 173 | WORD32 dst_strd, |
| 174 | WORD32 ht, |
| 175 | WORD32 wd) |
| 176 | { |
| 177 | WORD32 row, col; |
| 178 | wd *= 2; |
| 179 | |
| 180 | for(row = 0; row < ht; row++) |
| 181 | { |
| 182 | for(col = 0; col < wd; col+=2) |
| 183 | { |
| 184 | pu1_dst[col] = pu1_src[col]; |
| 185 | } |
| 186 | |
| 187 | pu1_src += src_strd; |
| 188 | pu1_dst += dst_strd; |
| 189 | } |
| 190 | } |
| 191 | |
| 192 | /** |
| 193 | ******************************************************************************* |
| 194 | * |
| 195 | * @brief |
| 196 | * Interprediction luma filter for horizontal input |
| 197 | * |
| 198 | * @par Description: |
| 199 | * Applies a 6 tap horizontal filter .The output is clipped to 8 bits |
| 200 | * sec 8.4.2.2.1 titled "Luma sample interpolation process" |
| 201 | * |
| 202 | * @param[in] pu1_src |
| 203 | * UWORD8 pointer to the source |
| 204 | * |
| 205 | * @param[out] pu1_dst |
| 206 | * UWORD8 pointer to the destination |
| 207 | * |
| 208 | * @param[in] src_strd |
| 209 | * integer source stride |
| 210 | * |
| 211 | * @param[in] dst_strd |
| 212 | * integer destination stride |
| 213 | * |
| 214 | * @param[in] ht |
| 215 | * integer height of the array |
| 216 | * |
| 217 | * @param[in] wd |
| 218 | * integer width of the array |
| 219 | * |
| 220 | * @returns |
| 221 | * |
| 222 | * @remarks |
| 223 | * None |
| 224 | * |
| 225 | ******************************************************************************* |
| 226 | */ |
| 227 | void ih264_inter_pred_luma_horz(UWORD8 *pu1_src, |
| 228 | UWORD8 *pu1_dst, |
| 229 | WORD32 src_strd, |
| 230 | WORD32 dst_strd, |
| 231 | WORD32 ht, |
| 232 | WORD32 wd, |
| 233 | UWORD8* pu1_tmp, |
| 234 | WORD32 dydx) |
| 235 | { |
| 236 | WORD32 row, col; |
| 237 | WORD16 i2_tmp; |
| 238 | UNUSED(pu1_tmp); |
| 239 | UNUSED(dydx); |
| 240 | |
| 241 | for(row = 0; row < ht; row++) |
| 242 | { |
| 243 | for(col = 0; col < wd; col++) |
| 244 | { |
| 245 | i2_tmp = 0;/*ih264_g_six_tap[] is the array containing the filter coeffs*/ |
| 246 | i2_tmp = ih264_g_six_tap[0] * |
| 247 | (pu1_src[col - 2] + pu1_src[col + 3]) |
| 248 | + ih264_g_six_tap[1] * |
| 249 | (pu1_src[col - 1] + pu1_src[col + 2]) |
| 250 | + ih264_g_six_tap[2] * |
| 251 | (pu1_src[col] + pu1_src[col + 1]); |
| 252 | i2_tmp = (i2_tmp + 16) >> 5; |
| 253 | pu1_dst[col] = CLIP_U8(i2_tmp); |
| 254 | } |
| 255 | |
| 256 | pu1_src += src_strd; |
| 257 | pu1_dst += dst_strd; |
| 258 | } |
| 259 | |
| 260 | } |
| 261 | |
| 262 | /** |
| 263 | ******************************************************************************* |
| 264 | * |
| 265 | * @brief |
| 266 | * Interprediction luma filter for vertical input |
| 267 | * |
| 268 | * @par Description: |
| 269 | * Applies a 6 tap vertical filter.The output is clipped to 8 bits |
| 270 | * sec 8.4.2.2.1 titled "Luma sample interpolation process" |
| 271 | * |
| 272 | * @param[in] pu1_src |
| 273 | * UWORD8 pointer to the source |
| 274 | * |
| 275 | * @param[out] pu1_dst |
| 276 | * UWORD8 pointer to the destination |
| 277 | * |
| 278 | * @param[in] src_strd |
| 279 | * integer source stride |
| 280 | * |
| 281 | * @param[in] dst_strd |
| 282 | * integer destination stride |
| 283 | * |
| 284 | * @param[in] ht |
| 285 | * integer height of the array |
| 286 | * |
| 287 | * @param[in] wd |
| 288 | * integer width of the array |
| 289 | * |
| 290 | * @returns |
| 291 | * |
| 292 | * @remarks |
| 293 | * None |
| 294 | * |
| 295 | ******************************************************************************* |
| 296 | */ |
| 297 | void ih264_inter_pred_luma_vert(UWORD8 *pu1_src, |
| 298 | UWORD8 *pu1_dst, |
| 299 | WORD32 src_strd, |
| 300 | WORD32 dst_strd, |
| 301 | WORD32 ht, |
| 302 | WORD32 wd, |
| 303 | UWORD8* pu1_tmp, |
| 304 | WORD32 dydx) |
| 305 | { |
| 306 | WORD32 row, col; |
| 307 | WORD16 i2_tmp; |
| 308 | UNUSED(pu1_tmp); |
| 309 | UNUSED(dydx); |
| 310 | |
| 311 | for(row = 0; row < ht; row++) |
| 312 | { |
| 313 | for(col = 0; col < wd; col++) |
| 314 | { |
| 315 | i2_tmp = 0; /*ih264_g_six_tap[] is the array containing the filter coeffs*/ |
| 316 | i2_tmp = ih264_g_six_tap[0] * |
| 317 | (pu1_src[col - 2 * src_strd] + pu1_src[col + 3 * src_strd]) |
| 318 | + ih264_g_six_tap[1] * |
| 319 | (pu1_src[col - 1 * src_strd] + pu1_src[col + 2 * src_strd]) |
| 320 | + ih264_g_six_tap[2] * |
| 321 | (pu1_src[col] + pu1_src[col + 1 * src_strd]); |
| 322 | i2_tmp = (i2_tmp + 16) >> 5; |
| 323 | pu1_dst[col] = CLIP_U8(i2_tmp); |
| 324 | } |
| 325 | pu1_src += src_strd; |
| 326 | pu1_dst += dst_strd; |
| 327 | } |
| 328 | } |
| 329 | |
| 330 | /*! |
| 331 | ************************************************************************** |
| 332 | * \if Function name : ih264_inter_pred_luma_horz_hpel_vert_hpel \endif |
| 333 | * |
| 334 | * \brief |
| 335 | * This function implements a two stage cascaded six tap filter. It |
| 336 | * applies the six tap filter in the horizontal direction on the |
| 337 | * predictor values, followed by applying the same filter in the |
| 338 | * vertical direction on the output of the first stage. The six tap |
| 339 | * filtering operation is described in sec 8.4.2.2.1 titled "Luma sample |
| 340 | * interpolation process" |
| 341 | * |
| 342 | * \param pu1_src: Pointer to the buffer containing the predictor values. |
| 343 | * pu1_src could point to the frame buffer or the predictor buffer. |
| 344 | * \param pu1_dst: Pointer to the destination buffer where the output of |
| 345 | * the six tap filter is stored. |
| 346 | * \param ht: Height of the rectangular pixel grid to be interpolated |
| 347 | * \param wd: Width of the rectangular pixel grid to be interpolated |
| 348 | * \param src_strd: Width of the buffer pointed to by pu1_src. |
| 349 | * \param dst_strd: Width of the destination buffer |
| 350 | * \param pu1_tmp: temporary buffer. |
| 351 | * \param dydx: x and y reference offset for qpel calculations: UNUSED in this function. |
| 352 | * |
| 353 | * \return |
| 354 | * None. |
| 355 | * |
| 356 | * \note |
| 357 | * This function takes the 8 bit predictor values, applies the six tap |
| 358 | * filter in the horizontal direction and outputs the result clipped to |
| 359 | * 8 bit precision. The input is stored in the buffer pointed to by |
| 360 | * pu1_src while the output is stored in the buffer pointed by pu1_dst. |
| 361 | * Both pu1_src and pu1_dst could point to the same buffer i.e. the |
| 362 | * six tap filter could be done in place. |
| 363 | * |
| 364 | ************************************************************************** |
| 365 | */ |
| 366 | void ih264_inter_pred_luma_horz_hpel_vert_hpel(UWORD8 *pu1_src, |
| 367 | UWORD8 *pu1_dst, |
| 368 | WORD32 src_strd, |
| 369 | WORD32 dst_strd, |
| 370 | WORD32 ht, |
| 371 | WORD32 wd, |
| 372 | UWORD8* pu1_tmp, |
| 373 | WORD32 dydx) |
| 374 | { |
| 375 | WORD32 row, col; |
| 376 | WORD32 tmp; |
| 377 | WORD16* pi2_pred1_temp; |
| 378 | WORD16* pi2_pred1; |
| 379 | UNUSED(dydx); |
| 380 | pi2_pred1_temp = (WORD16*)pu1_tmp; |
| 381 | pi2_pred1_temp += 2; |
| 382 | pi2_pred1 = pi2_pred1_temp; |
| 383 | for(row = 0; row < ht; row++) |
| 384 | { |
| 385 | for(col = -2; col < wd + 3; col++) |
| 386 | { |
| 387 | tmp = 0;/*ih264_g_six_tap[] is the array containing the filter coeffs*/ |
| 388 | tmp = ih264_g_six_tap[0] * |
| 389 | (pu1_src[col - 2 * src_strd] + pu1_src[col + 3 * src_strd]) |
| 390 | + ih264_g_six_tap[1] * |
| 391 | (pu1_src[col - 1 * src_strd] + pu1_src[col + 2 * src_strd]) |
| 392 | + ih264_g_six_tap[2] * |
| 393 | (pu1_src[col] + pu1_src[col + 1 * src_strd]); |
| 394 | pi2_pred1_temp[col] = tmp; |
| 395 | } |
| 396 | pu1_src += src_strd; |
| 397 | pi2_pred1_temp = pi2_pred1_temp + wd + 5; |
| 398 | } |
| 399 | |
| 400 | for(row = 0; row < ht; row++) |
| 401 | { |
| 402 | for(col = 0; col < wd; col++) |
| 403 | { |
| 404 | tmp = 0;/*ih264_g_six_tap[] is the array containing the filter coeffs*/ |
| 405 | tmp = ih264_g_six_tap[0] * |
| 406 | (pi2_pred1[col - 2] + pi2_pred1[col + 3]) |
| 407 | + ih264_g_six_tap[1] * |
| 408 | (pi2_pred1[col - 1] + pi2_pred1[col + 2]) |
| 409 | + ih264_g_six_tap[2] * (pi2_pred1[col] + pi2_pred1[col + 1]); |
| 410 | tmp = (tmp + 512) >> 10; |
| 411 | pu1_dst[col] = CLIP_U8(tmp); |
| 412 | } |
| 413 | pi2_pred1 += (wd + 5); |
| 414 | pu1_dst += dst_strd; |
| 415 | } |
| 416 | } |
| 417 | |
| 418 | /*! |
| 419 | ************************************************************************** |
| 420 | * \if Function name : ih264_inter_pred_luma_horz_qpel \endif |
| 421 | * |
| 422 | * \brief |
| 423 | * This routine applies the six tap filter to the predictors in the |
| 424 | * horizontal direction. The six tap filtering operation is described in |
| 425 | * sec 8.4.2.2.1 titled "Luma sample interpolation process" |
| 426 | * |
| 427 | * \param pu1_src: Pointer to the buffer containing the predictor values. |
| 428 | * pu1_src could point to the frame buffer or the predictor buffer. |
| 429 | * \param pu1_dst: Pointer to the destination buffer where the output of |
| 430 | * the six tap filter is stored. |
| 431 | * \param ht: Height of the rectangular pixel grid to be interpolated |
| 432 | * \param wd: Width of the rectangular pixel grid to be interpolated |
| 433 | * \param src_strd: Width of the buffer pointed to by pu1_src. |
| 434 | * \param dst_strd: Width of the destination buffer |
| 435 | * \param pu1_tmp: temporary buffer: UNUSED in this function |
| 436 | * \param dydx: x and y reference offset for qpel calculations. |
| 437 | * |
| 438 | * \return |
| 439 | * None. |
| 440 | * |
| 441 | * \note |
| 442 | * This function takes the 8 bit predictor values, applies the six tap |
| 443 | * filter in the horizontal direction and outputs the result clipped to |
| 444 | * 8 bit precision. The input is stored in the buffer pointed to by |
| 445 | * pu1_src while the output is stored in the buffer pointed by pu1_dst. |
| 446 | * Both pu1_src and pu1_dst could point to the same buffer i.e. the |
| 447 | * six tap filter could be done in place. |
| 448 | * |
| 449 | ************************************************************************** |
| 450 | */ |
| 451 | void ih264_inter_pred_luma_horz_qpel(UWORD8 *pu1_src, |
| 452 | UWORD8 *pu1_dst, |
| 453 | WORD32 src_strd, |
| 454 | WORD32 dst_strd, |
| 455 | WORD32 ht, |
| 456 | WORD32 wd, |
| 457 | UWORD8* pu1_tmp, |
| 458 | WORD32 dydx) |
| 459 | { |
| 460 | WORD32 row, col; |
| 461 | UWORD8 *pu1_pred1; |
| 462 | WORD32 x_offset = dydx & 0x3; |
| 463 | UNUSED(pu1_tmp); |
| 464 | pu1_pred1 = pu1_src + (x_offset >> 1); |
| 465 | |
| 466 | for(row = 0; row < ht; row++) |
| 467 | { |
| 468 | for(col = 0; col < wd; col++, pu1_src++, pu1_dst++) |
| 469 | { |
| 470 | WORD16 i2_temp; |
| 471 | /* The logic below implements the following equation |
| 472 | i2_temp = puc_pred[-2] - 5 * (puc_pred[-1] + puc_pred[2]) + |
| 473 | 20 * (puc_pred[0] + puc_pred[1]) + puc_pred[3]; */ |
| 474 | i2_temp = pu1_src[-2] + pu1_src[3] |
| 475 | - (pu1_src[-1] + pu1_src[2]) |
| 476 | + ((pu1_src[0] + pu1_src[1] - pu1_src[-1] - pu1_src[2]) << 2) |
| 477 | + ((pu1_src[0] + pu1_src[1]) << 4); |
| 478 | i2_temp = (i2_temp + 16) >> 5; |
| 479 | i2_temp = CLIP_U8(i2_temp); |
| 480 | *pu1_dst = (i2_temp + *pu1_pred1 + 1) >> 1; |
| 481 | |
| 482 | pu1_pred1++; |
| 483 | } |
| 484 | pu1_dst += dst_strd - wd; |
| 485 | pu1_src += src_strd - wd; |
| 486 | pu1_pred1 += src_strd - wd; |
| 487 | } |
| 488 | } |
| 489 | |
| 490 | /*! |
| 491 | ************************************************************************** |
| 492 | * \if Function name : ih264_inter_pred_luma_vert_qpel \endif |
| 493 | * |
| 494 | * \brief |
| 495 | * This routine applies the six tap filter to the predictors in the |
| 496 | * vertical direction and interpolates them to obtain pixels at quarter vertical |
| 497 | * positions (0, 1/4) and (0, 3/4). The six tap filtering operation is |
| 498 | * described in sec 8.4.2.2.1 titled "Luma sample interpolation process" |
| 499 | * |
| 500 | * \param pu1_src: Pointer to the buffer containing the predictor values. |
| 501 | * pu1_src could point to the frame buffer or the predictor buffer. |
| 502 | * \param pu1_dst: Pointer to the destination buffer where the output of |
| 503 | * the six tap filter is stored. |
| 504 | * \param ht: Height of the rectangular pixel grid to be interpolated |
| 505 | * \param wd: Width of the rectangular pixel grid to be interpolated |
| 506 | * \param src_strd: Width of the buffer pointed to by puc_pred. |
| 507 | * \param dst_strd: Width of the destination buffer |
| 508 | * \param pu1_tmp: temporary buffer: UNUSED in this function |
| 509 | * \param dydx: x and y reference offset for qpel calculations. |
| 510 | * |
| 511 | * \return |
| 512 | * void |
| 513 | * |
| 514 | * \note |
| 515 | * This function takes the 8 bit predictor values, applies the six tap |
| 516 | * filter in the vertical direction and outputs the result clipped to |
| 517 | * 8 bit precision. The input is stored in the buffer pointed to by |
| 518 | * puc_pred while the output is stored in the buffer pointed by puc_dest. |
| 519 | * Both puc_pred and puc_dest could point to the same buffer i.e. the |
| 520 | * six tap filter could be done in place. |
| 521 | * |
| 522 | * \para <title> |
| 523 | * <paragraph> |
| 524 | * ... |
| 525 | ************************************************************************** |
| 526 | */ |
| 527 | void ih264_inter_pred_luma_vert_qpel(UWORD8 *pu1_src, |
| 528 | UWORD8 *pu1_dst, |
| 529 | WORD32 src_strd, |
| 530 | WORD32 dst_strd, |
| 531 | WORD32 ht, |
| 532 | WORD32 wd, |
| 533 | UWORD8* pu1_tmp, |
| 534 | WORD32 dydx) |
| 535 | { |
| 536 | WORD32 row, col; |
| 537 | WORD32 y_offset = dydx >> 2; |
| 538 | WORD32 off1, off2, off3; |
| 539 | UWORD8 *pu1_pred1; |
| 540 | UNUSED(pu1_tmp); |
| 541 | y_offset = y_offset & 0x3; |
| 542 | |
| 543 | off1 = src_strd; |
| 544 | off2 = src_strd << 1; |
| 545 | off3 = off1 + off2; |
| 546 | |
| 547 | pu1_pred1 = pu1_src + (y_offset >> 1) * src_strd; |
| 548 | |
| 549 | for(row = 0; row < ht; row++) |
| 550 | { |
| 551 | for(col = 0; col < wd; col++, pu1_dst++, pu1_src++, pu1_pred1++) |
| 552 | { |
| 553 | WORD16 i2_temp; |
| 554 | /* The logic below implements the following equation |
| 555 | i16_temp = puc_pred[-2*src_strd] + puc_pred[3*src_strd] - |
| 556 | 5 * (puc_pred[-1*src_strd] + puc_pred[2*src_strd]) + |
| 557 | 20 * (puc_pred[0] + puc_pred[src_strd]); */ |
| 558 | i2_temp = pu1_src[-off2] + pu1_src[off3] |
| 559 | - (pu1_src[-off1] + pu1_src[off2]) |
| 560 | + ((pu1_src[0] + pu1_src[off1] - pu1_src[-off1] - pu1_src[off2]) << 2) |
| 561 | + ((pu1_src[0] + pu1_src[off1]) << 4); |
| 562 | i2_temp = (i2_temp + 16) >> 5; |
| 563 | i2_temp = CLIP_U8(i2_temp); |
| 564 | |
| 565 | *pu1_dst = (i2_temp + *pu1_pred1 + 1) >> 1; |
| 566 | } |
| 567 | pu1_src += src_strd - wd; |
| 568 | pu1_pred1 += src_strd - wd; |
| 569 | pu1_dst += dst_strd - wd; |
| 570 | } |
| 571 | } |
| 572 | |
| 573 | /*! |
| 574 | ************************************************************************** |
| 575 | * \if Function name : ih264_inter_pred_luma_horz_qpel_vert_qpel \endif |
| 576 | * |
| 577 | * \brief |
| 578 | * This routine applies the six tap filter to the predictors in the |
| 579 | * vertical and horizontal direction and averages them to get pixels at locations |
| 580 | * (1/4,1/4), (1/4, 3/4), (3/4, 1/4) & (3/4, 3/4). The six tap filtering operation |
| 581 | * is described in sec 8.4.2.2.1 titled "Luma sample interpolation process" |
| 582 | * |
| 583 | * \param pu1_src: Pointer to the buffer containing the predictor values. |
| 584 | * pu1_src could point to the frame buffer or the predictor buffer. |
| 585 | * \param pu1_dst: Pointer to the destination buffer where the output of |
| 586 | * the six tap filter is stored. |
| 587 | * \param wd: Width of the rectangular pixel grid to be interpolated |
| 588 | * \param ht: Height of the rectangular pixel grid to be interpolated |
| 589 | * \param src_strd: Width of the buffer pointed to by puc_pred. |
| 590 | * \param dst_strd: Width of the destination buffer |
| 591 | * \param pu1_tmp: temporary buffer, UNUSED in this function |
| 592 | * \param dydx: x and y reference offset for qpel calculations. |
| 593 | * |
| 594 | * \return |
| 595 | * void |
| 596 | * |
| 597 | * \note |
| 598 | * This function takes the 8 bit predictor values, applies the six tap |
| 599 | * filter in the vertical direction and outputs the result clipped to |
| 600 | * 8 bit precision. The input is stored in the buffer pointed to by |
| 601 | * puc_pred while the output is stored in the buffer pointed by puc_dest. |
| 602 | * Both puc_pred and puc_dest could point to the same buffer i.e. the |
| 603 | * six tap filter could be done in place. |
| 604 | * |
| 605 | * \para <title> |
| 606 | * <paragraph> |
| 607 | * ... |
| 608 | ************************************************************************** |
| 609 | */ |
| 610 | void ih264_inter_pred_luma_horz_qpel_vert_qpel(UWORD8 *pu1_src, |
| 611 | UWORD8 *pu1_dst, |
| 612 | WORD32 src_strd, |
| 613 | WORD32 dst_strd, |
| 614 | WORD32 ht, |
| 615 | WORD32 wd, |
| 616 | UWORD8* pu1_tmp, |
| 617 | WORD32 dydx) |
| 618 | { |
| 619 | WORD32 row, col; |
| 620 | WORD32 x_offset = dydx & 0x3; |
| 621 | WORD32 y_offset = dydx >> 2; |
| 622 | |
| 623 | WORD32 off1, off2, off3; |
| 624 | UWORD8* pu1_pred_vert, *pu1_pred_horz; |
| 625 | UNUSED(pu1_tmp); |
| 626 | y_offset = y_offset & 0x3; |
| 627 | |
| 628 | off1 = src_strd; |
| 629 | off2 = src_strd << 1; |
| 630 | off3 = off1 + off2; |
| 631 | |
| 632 | pu1_pred_horz = pu1_src + (y_offset >> 1) * src_strd; |
| 633 | pu1_pred_vert = pu1_src + (x_offset >> 1); |
| 634 | |
| 635 | for(row = 0; row < ht; row++) |
| 636 | { |
| 637 | for(col = 0; col < wd; |
| 638 | col++, pu1_dst++, pu1_pred_vert++, pu1_pred_horz++) |
| 639 | { |
| 640 | WORD16 i2_temp_vert, i2_temp_horz; |
| 641 | /* The logic below implements the following equation |
| 642 | i2_temp = puc_pred[-2*src_strd] + puc_pred[3*src_strd] - |
| 643 | 5 * (puc_pred[-1*src_strd] + puc_pred[2*src_strd]) + |
| 644 | 20 * (puc_pred[0] + puc_pred[src_strd]); */ |
| 645 | i2_temp_vert = pu1_pred_vert[-off2] + pu1_pred_vert[off3] |
| 646 | - (pu1_pred_vert[-off1] + pu1_pred_vert[off2]) |
| 647 | + ((pu1_pred_vert[0] + pu1_pred_vert[off1] |
| 648 | - pu1_pred_vert[-off1] |
| 649 | - pu1_pred_vert[off2]) << 2) |
| 650 | + ((pu1_pred_vert[0] + pu1_pred_vert[off1]) << 4); |
| 651 | i2_temp_vert = (i2_temp_vert + 16) >> 5; |
| 652 | i2_temp_vert = CLIP_U8(i2_temp_vert); |
| 653 | |
| 654 | /* The logic below implements the following equation |
| 655 | i16_temp = puc_pred[-2] - 5 * (puc_pred[-1] + puc_pred[2]) + |
| 656 | 20 * (puc_pred[0] + puc_pred[1]) + puc_pred[3]; */ |
| 657 | i2_temp_horz = pu1_pred_horz[-2] + pu1_pred_horz[3] |
| 658 | - (pu1_pred_horz[-1] + pu1_pred_horz[2]) |
| 659 | + ((pu1_pred_horz[0] + pu1_pred_horz[1] |
| 660 | - pu1_pred_horz[-1] |
| 661 | - pu1_pred_horz[2]) << 2) |
| 662 | + ((pu1_pred_horz[0] + pu1_pred_horz[1]) << 4); |
| 663 | i2_temp_horz = (i2_temp_horz + 16) >> 5; |
| 664 | i2_temp_horz = CLIP_U8(i2_temp_horz); |
| 665 | *pu1_dst = (i2_temp_vert + i2_temp_horz + 1) >> 1; |
| 666 | } |
| 667 | pu1_pred_vert += (src_strd - wd); |
| 668 | pu1_pred_horz += (src_strd - wd); |
| 669 | pu1_dst += (dst_strd - wd); |
| 670 | } |
| 671 | } |
| 672 | |
| 673 | /*! |
| 674 | ************************************************************************** |
| 675 | * \if Function name : ih264_inter_pred_luma_horz_qpel_vert_hpel \endif |
| 676 | * |
| 677 | * \brief |
| 678 | * This routine applies the six tap filter to the predictors in the vertical |
| 679 | * and horizontal direction to obtain the pixel at (1/2,1/2). It then interpolates |
| 680 | * pixel at (0,1/2) and (1/2,1/2) to obtain pixel at (1/4,1/2). Similarly for (3/4,1/2). |
| 681 | * The six tap filtering operation is described in sec 8.4.2.2.1 titled |
| 682 | * "Luma sample interpolation process" |
| 683 | * |
| 684 | * \param pu1_src: Pointer to the buffer containing the predictor values. |
| 685 | * pu1_src could point to the frame buffer or the predictor buffer. |
| 686 | * \param pu1_dst: Pointer to the destination buffer where the output of |
| 687 | * the six tap filter followed by interpolation is stored. |
| 688 | * \param wd: Width of the rectangular pixel grid to be interpolated |
| 689 | * \param ht: Height of the rectangular pixel grid to be interpolated |
| 690 | * \param src_strd: Width of the buffer pointed to by puc_pred. |
| 691 | * \param dst_strd: Width of the destination buffer |
| 692 | * \param pu1_tmp: buffer to store temporary output after 1st 6-tap filter. |
| 693 | * \param dydx: x and y reference offset for qpel calculations. |
| 694 | * |
| 695 | * \return |
| 696 | * void |
| 697 | * |
| 698 | * \note |
| 699 | * This function takes the 8 bit predictor values, applies the six tap |
| 700 | * filter in the vertical direction and outputs the result clipped to |
| 701 | * 8 bit precision. The input is stored in the buffer pointed to by |
| 702 | * puc_pred while the output is stored in the buffer pointed by puc_dest. |
| 703 | * Both puc_pred and puc_dest could point to the same buffer i.e. the |
| 704 | * six tap filter could be done in place. |
| 705 | * |
| 706 | * \para <title> |
| 707 | * <paragraph> |
| 708 | * ... |
| 709 | ************************************************************************** |
| 710 | */ |
| 711 | void ih264_inter_pred_luma_horz_qpel_vert_hpel(UWORD8 *pu1_src, |
| 712 | UWORD8 *pu1_dst, |
| 713 | WORD32 src_strd, |
| 714 | WORD32 dst_strd, |
| 715 | WORD32 ht, |
| 716 | WORD32 wd, |
| 717 | UWORD8* pu1_tmp, |
| 718 | WORD32 dydx) |
| 719 | { |
| 720 | WORD32 row, col; |
| 721 | WORD32 tmp; |
| 722 | WORD16* pi2_pred1_temp, *pi2_pred1; |
| 723 | UWORD8* pu1_dst_tmp; |
| 724 | WORD32 x_offset = dydx & 0x3; |
| 725 | WORD16 i2_macro; |
| 726 | |
| 727 | pi2_pred1_temp = (WORD16*)pu1_tmp; |
| 728 | pi2_pred1_temp += 2; |
| 729 | pi2_pred1 = pi2_pred1_temp; |
| 730 | pu1_dst_tmp = pu1_dst; |
| 731 | |
| 732 | for(row = 0; row < ht; row++) |
| 733 | { |
| 734 | for(col = -2; col < wd + 3; col++) |
| 735 | { |
| 736 | tmp = 0;/*ih264_g_six_tap[] is the array containing the filter coeffs*/ |
| 737 | tmp = ih264_g_six_tap[0] * |
| 738 | (pu1_src[col - 2 * src_strd] + pu1_src[col + 3 * src_strd]) |
| 739 | + ih264_g_six_tap[1] * |
| 740 | (pu1_src[col - 1 * src_strd] + pu1_src[col + 2 * src_strd]) |
| 741 | + ih264_g_six_tap[2] * |
| 742 | (pu1_src[col] + pu1_src[col + 1 * src_strd]); |
| 743 | pi2_pred1_temp[col] = tmp; |
| 744 | } |
| 745 | |
| 746 | pu1_src += src_strd; |
| 747 | pi2_pred1_temp = pi2_pred1_temp + wd + 5; |
| 748 | } |
| 749 | |
| 750 | pi2_pred1_temp = pi2_pred1; |
| 751 | for(row = 0; row < ht; row++) |
| 752 | { |
| 753 | for(col = 0; col < wd; col++) |
| 754 | { |
| 755 | tmp = 0;/*ih264_g_six_tap[] is the array containing the filter coeffs*/ |
| 756 | tmp = ih264_g_six_tap[0] * |
| 757 | (pi2_pred1[col - 2] + pi2_pred1[col + 3]) |
| 758 | + ih264_g_six_tap[1] * |
| 759 | (pi2_pred1[col - 1] + pi2_pred1[col + 2]) |
| 760 | + ih264_g_six_tap[2] * |
| 761 | (pi2_pred1[col] + pi2_pred1[col + 1]); |
| 762 | tmp = (tmp + 512) >> 10; |
| 763 | pu1_dst[col] = CLIP_U8(tmp); |
| 764 | } |
| 765 | pi2_pred1 += (wd + 5); |
| 766 | pu1_dst += dst_strd; |
| 767 | } |
| 768 | |
| 769 | pu1_dst = pu1_dst_tmp; |
| 770 | pi2_pred1_temp += (x_offset >> 1); |
| 771 | for(row = ht; row != 0; row--) |
| 772 | { |
| 773 | for(col = wd; col != 0; col--, pu1_dst++, pi2_pred1_temp++) |
| 774 | { |
| 775 | UWORD8 uc_temp; |
| 776 | /* Clipping the output of the six tap filter obtained from the |
| 777 | first stage of the 2d filter stage */ |
| 778 | *pi2_pred1_temp = (*pi2_pred1_temp + 16) >> 5; |
| 779 | i2_macro = (*pi2_pred1_temp); |
| 780 | uc_temp = CLIP_U8(i2_macro); |
| 781 | *pu1_dst = (*pu1_dst + uc_temp + 1) >> 1; |
| 782 | } |
| 783 | pi2_pred1_temp += 5; |
| 784 | pu1_dst += dst_strd - wd; |
| 785 | } |
| 786 | } |
| 787 | |
| 788 | /*! |
| 789 | ************************************************************************** |
| 790 | * \if Function name : ih264_inter_pred_luma_horz_hpel_vert_qpel \endif |
| 791 | * |
| 792 | * \brief |
| 793 | * This routine applies the six tap filter to the predictors in the horizontal |
| 794 | * and vertical direction to obtain the pixel at (1/2,1/2). It then interpolates |
| 795 | * pixel at (1/2,0) and (1/2,1/2) to obtain pixel at (1/2,1/4). Similarly for (1/2,3/4). |
| 796 | * The six tap filtering operation is described in sec 8.4.2.2.1 titled |
| 797 | * "Luma sample interpolation process" |
| 798 | * |
| 799 | * \param pu1_src: Pointer to the buffer containing the predictor values. |
| 800 | * pu1_src could point to the frame buffer or the predictor buffer. |
| 801 | * \param pu1_dst: Pointer to the destination buffer where the output of |
| 802 | * the six tap filter followed by interpolation is stored. |
| 803 | * \param wd: Width of the rectangular pixel grid to be interpolated |
| 804 | * \param ht: Height of the rectangular pixel grid to be interpolated |
| 805 | * \param src_strd: Width of the buffer pointed to by puc_pred. |
| 806 | * \param dst_strd: Width of the destination buffer |
| 807 | * \param pu1_tmp: buffer to store temporary output after 1st 6-tap filter. |
| 808 | * \param dydx: x and y reference offset for qpel calculations. |
| 809 | * |
| 810 | * \return |
| 811 | * void |
| 812 | * |
| 813 | * \note |
| 814 | * This function takes the 8 bit predictor values, applies the six tap |
| 815 | * filter in the vertical direction and outputs the result clipped to |
| 816 | * 8 bit precision. The input is stored in the buffer pointed to by |
| 817 | * puc_pred while the output is stored in the buffer pointed by puc_dest. |
| 818 | * Both puc_pred and puc_dest could point to the same buffer i.e. the |
| 819 | * six tap filter could be done in place. |
| 820 | * |
| 821 | * \para <title> |
| 822 | * <paragraph> |
| 823 | * ... |
| 824 | ************************************************************************** |
| 825 | */ |
| 826 | void ih264_inter_pred_luma_horz_hpel_vert_qpel(UWORD8 *pu1_src, |
| 827 | UWORD8 *pu1_dst, |
| 828 | WORD32 src_strd, |
| 829 | WORD32 dst_strd, |
| 830 | WORD32 ht, |
| 831 | WORD32 wd, |
| 832 | UWORD8* pu1_tmp, |
| 833 | WORD32 dydx) |
| 834 | { |
| 835 | |
| 836 | WORD32 row, col; |
| 837 | WORD32 tmp; |
| 838 | WORD32 y_offset = dydx >> 2; |
| 839 | WORD16* pi2_pred1_temp, *pi2_pred1; |
| 840 | UWORD8* pu1_dst_tmp; |
| 841 | //WORD32 x_offset = dydx & 0x3; |
| 842 | WORD16 i2_macro; |
| 843 | |
| 844 | y_offset = y_offset & 0x3; |
| 845 | |
| 846 | pi2_pred1_temp = (WORD16*)pu1_tmp; |
| 847 | pi2_pred1_temp += 2 * wd; |
| 848 | pi2_pred1 = pi2_pred1_temp; |
| 849 | pu1_dst_tmp = pu1_dst; |
| 850 | pu1_src -= 2 * src_strd; |
| 851 | for(row = -2; row < ht + 3; row++) |
| 852 | { |
| 853 | for(col = 0; col < wd; col++) |
| 854 | { |
| 855 | tmp = 0;/*ih264_g_six_tap[] is the array containing the filter coeffs*/ |
| 856 | tmp = ih264_g_six_tap[0] * (pu1_src[col - 2] + pu1_src[col + 3]) |
| 857 | + ih264_g_six_tap[1] * (pu1_src[col - 1] + pu1_src[col + 2]) |
| 858 | + ih264_g_six_tap[2] * (pu1_src[col] + pu1_src[col + 1]); |
| 859 | pi2_pred1_temp[col - 2 * wd] = tmp; |
| 860 | } |
| 861 | |
| 862 | pu1_src += src_strd; |
| 863 | pi2_pred1_temp += wd; |
| 864 | } |
| 865 | pi2_pred1_temp = pi2_pred1; |
| 866 | for(row = 0; row < ht; row++) |
| 867 | { |
| 868 | for(col = 0; col < wd; col++) |
| 869 | { |
| 870 | tmp = 0;/*ih264_g_six_tap[] is the array containing the filter coeffs*/ |
| 871 | tmp = ih264_g_six_tap[0] * (pi2_pred1[col - 2 * wd] + pi2_pred1[col + 3 * wd]) |
| 872 | + ih264_g_six_tap[1] * (pi2_pred1[col - 1 * wd] + pi2_pred1[col + 2 * wd]) |
| 873 | + ih264_g_six_tap[2] * (pi2_pred1[col] + pi2_pred1[col + 1 * wd]); |
| 874 | tmp = (tmp + 512) >> 10; |
| 875 | pu1_dst[col] = CLIP_U8(tmp); |
| 876 | } |
| 877 | pi2_pred1 += wd; |
| 878 | pu1_dst += dst_strd; |
| 879 | } |
| 880 | pu1_dst = pu1_dst_tmp; |
| 881 | pi2_pred1_temp += (y_offset >> 1) * wd; |
| 882 | for(row = ht; row != 0; row--) |
| 883 | |
| 884 | { |
| 885 | for(col = wd; col != 0; col--, pu1_dst++, pi2_pred1_temp++) |
| 886 | { |
| 887 | UWORD8 u1_temp; |
| 888 | /* Clipping the output of the six tap filter obtained from the |
| 889 | first stage of the 2d filter stage */ |
| 890 | *pi2_pred1_temp = (*pi2_pred1_temp + 16) >> 5; |
| 891 | i2_macro = (*pi2_pred1_temp); |
| 892 | u1_temp = CLIP_U8(i2_macro); |
| 893 | *pu1_dst = (*pu1_dst + u1_temp + 1) >> 1; |
| 894 | } |
| 895 | //pi16_pred1_temp += wd; |
| 896 | pu1_dst += dst_strd - wd; |
| 897 | } |
| 898 | } |
| 899 | |
| 900 | /** |
| 901 | ******************************************************************************* |
| 902 | * function:ih264_inter_pred_luma_bilinear |
| 903 | * |
| 904 | * @brief |
| 905 | * This routine applies the bilinear filter to the predictors . |
| 906 | * The filtering operation is described in |
| 907 | * sec 8.4.2.2.1 titled "Luma sample interpolation process" |
| 908 | * |
| 909 | * @par Description: |
| 910 | \note |
| 911 | * This function is called to obtain pixels lying at the following |
| 912 | * locations (1/4,1), (3/4,1),(1,1/4), (1,3/4) ,(1/4,1/2), (3/4,1/2),(1/2,1/4), (1/2,3/4),(3/4,1/4),(1/4,3/4),(3/4,3/4)&& (1/4,1/4) . |
| 913 | * The function averages the two adjacent values from the two input arrays in horizontal direction. |
| 914 | * |
| 915 | * |
| 916 | * @param[in] pu1_src1: |
| 917 | * UWORD8 Pointer to the buffer containing the first input array. |
| 918 | * |
| 919 | * @param[in] pu1_src2: |
| 920 | * UWORD8 Pointer to the buffer containing the second input array. |
| 921 | * |
| 922 | * @param[out] pu1_dst |
| 923 | * UWORD8 pointer to the destination where the output of bilinear filter is stored. |
| 924 | * |
| 925 | * @param[in] src_strd1 |
| 926 | * Stride of the first input buffer |
| 927 | * |
| 928 | * @param[in] src_strd2 |
| 929 | * Stride of the second input buffer |
| 930 | * |
| 931 | * @param[in] dst_strd |
| 932 | * integer destination stride of pu1_dst |
| 933 | * |
| 934 | * @param[in] ht |
| 935 | * integer height of the array |
| 936 | * |
| 937 | * @param[in] wd |
| 938 | * integer width of the array |
| 939 | * |
| 940 | * @returns |
| 941 | * |
| 942 | * @remarks |
| 943 | * None |
| 944 | * |
| 945 | ******************************************************************************* |
| 946 | */ |
| 947 | void ih264_inter_pred_luma_bilinear(UWORD8 *pu1_src1, |
| 948 | UWORD8 *pu1_src2, |
| 949 | UWORD8 *pu1_dst, |
| 950 | WORD32 src_strd1, |
| 951 | WORD32 src_strd2, |
| 952 | WORD32 dst_strd, |
| 953 | WORD32 ht, |
| 954 | WORD32 wd) |
| 955 | { |
| 956 | WORD32 row, col; |
| 957 | WORD16 i2_tmp; |
| 958 | |
| 959 | for(row = 0; row < ht; row++) |
| 960 | { |
| 961 | for(col = 0; col < wd; col++) |
| 962 | { |
| 963 | i2_tmp = pu1_src1[col] + pu1_src2[col]; |
| 964 | i2_tmp = (i2_tmp + 1) >> 1; |
| 965 | pu1_dst[col] = CLIP_U8(i2_tmp); |
| 966 | } |
| 967 | pu1_src1 += src_strd1; |
| 968 | pu1_src2 += src_strd2; |
| 969 | pu1_dst += dst_strd; |
| 970 | } |
| 971 | |
| 972 | } |
| 973 | |
| 974 | /** |
| 975 | ******************************************************************************* |
| 976 | * |
| 977 | * @brief |
| 978 | * Interprediction chroma filter |
| 979 | * |
| 980 | * @par Description: |
| 981 | * Applies filtering to chroma samples as mentioned in |
| 982 | * sec 8.4.2.2.2 titled "chroma sample interpolation process" |
| 983 | * |
| 984 | * @param[in] pu1_src |
| 985 | * UWORD8 pointer to the source containing alternate U and V samples |
| 986 | * |
| 987 | * @param[out] pu1_dst |
| 988 | * UWORD8 pointer to the destination |
| 989 | * |
| 990 | * @param[in] src_strd |
| 991 | * integer source stride |
| 992 | * |
| 993 | * @param[in] dst_strd |
| 994 | * integer destination stride |
| 995 | * |
| 996 | * @param[in] u1_dx |
| 997 | * dx value where the sample is to be produced(refer sec 8.4.2.2.2 ) |
| 998 | * |
| 999 | * @param[in] u1_dy |
| 1000 | * dy value where the sample is to be produced(refer sec 8.4.2.2.2 ) |
| 1001 | * |
| 1002 | * @param[in] ht |
| 1003 | * integer height of the array |
| 1004 | * |
| 1005 | * @param[in] wd |
| 1006 | * integer width of the array |
| 1007 | * |
| 1008 | * @returns |
| 1009 | * |
| 1010 | * @remarks |
| 1011 | * None |
| 1012 | * |
| 1013 | ******************************************************************************* |
| 1014 | */ |
| 1015 | void ih264_inter_pred_chroma(UWORD8 *pu1_src, |
| 1016 | UWORD8 *pu1_dst, |
| 1017 | WORD32 src_strd, |
| 1018 | WORD32 dst_strd, |
| 1019 | WORD32 dx, |
| 1020 | WORD32 dy, |
| 1021 | WORD32 ht, |
| 1022 | WORD32 wd) |
| 1023 | { |
| 1024 | WORD32 row, col; |
| 1025 | WORD16 i2_tmp; |
| 1026 | |
| 1027 | for(row = 0; row < ht; row++) |
| 1028 | { |
| 1029 | for(col = 0; col < 2 * wd; col++) |
| 1030 | { |
| 1031 | i2_tmp = 0; /* applies equation (8-266) in section 8.4.2.2.2 */ |
| 1032 | i2_tmp = (8 - dx) * (8 - dy) * pu1_src[col] |
| 1033 | + (dx) * (8 - dy) * pu1_src[col + 2] |
| 1034 | + (8 - dx) * (dy) * (pu1_src + src_strd)[col] |
| 1035 | + (dx) * (dy) * (pu1_src + src_strd)[col + 2]; |
| 1036 | i2_tmp = (i2_tmp + 32) >> 6; |
| 1037 | pu1_dst[col] = CLIP_U8(i2_tmp); |
| 1038 | } |
| 1039 | pu1_src += src_strd; |
| 1040 | pu1_dst += dst_strd; |
| 1041 | } |
| 1042 | } |