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  1. /*
  2.  * SIMD-optimized pixel operations
  3.  *
  4.  * This file is part of FFmpeg.
  5.  *
  6.  * FFmpeg is free software; you can redistribute it and/or
  7.  * modify it under the terms of the GNU Lesser General Public
  8.  * License as published by the Free Software Foundation; either
  9.  * version 2.1 of the License, or (at your option) any later version.
  10.  *
  11.  * FFmpeg is distributed in the hope that it will be useful,
  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14.  * Lesser General Public License for more details.
  15.  *
  16.  * You should have received a copy of the GNU Lesser General Public
  17.  * License along with FFmpeg; if not, write to the Free Software
  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19.  */
  20.  
  21. #include "libavutil/attributes.h"
  22. #include "libavcodec/pixblockdsp.h"
  23. #include "asm.h"
  24.  
  25. static void get_pixels_mvi(int16_t *restrict block,
  26.                            const uint8_t *restrict pixels, ptrdiff_t line_size)
  27. {
  28.     int h = 8;
  29.  
  30.     do {
  31.         uint64_t p;
  32.  
  33.         p = ldq(pixels);
  34.         stq(unpkbw(p),       block);
  35.         stq(unpkbw(p >> 32), block + 4);
  36.  
  37.         pixels += line_size;
  38.         block += 8;
  39.     } while (--h);
  40. }
  41.  
  42. static void diff_pixels_mvi(int16_t *block, const uint8_t *s1, const uint8_t *s2,
  43.                             int stride) {
  44.     int h = 8;
  45.     uint64_t mask = 0x4040;
  46.  
  47.     mask |= mask << 16;
  48.     mask |= mask << 32;
  49.     do {
  50.         uint64_t x, y, c, d, a;
  51.         uint64_t signs;
  52.  
  53.         x = ldq(s1);
  54.         y = ldq(s2);
  55.         c = cmpbge(x, y);
  56.         d = x - y;
  57.         a = zap(mask, c);       /* We use 0x4040404040404040 here...  */
  58.         d += 4 * a;             /* ...so we can use s4addq here.      */
  59.         signs = zap(-1, c);
  60.  
  61.         stq(unpkbw(d)       | (unpkbw(signs)       << 8), block);
  62.         stq(unpkbw(d >> 32) | (unpkbw(signs >> 32) << 8), block + 4);
  63.  
  64.         s1 += stride;
  65.         s2 += stride;
  66.         block += 8;
  67.     } while (--h);
  68. }
  69.  
  70. av_cold void ff_pixblockdsp_init_alpha(PixblockDSPContext *c, AVCodecContext *avctx,
  71.                                        unsigned high_bit_depth)
  72. {
  73.     if (amask(AMASK_MVI) == 0) {
  74.         if (!high_bit_depth)
  75.             c->get_pixels = get_pixels_mvi;
  76.         c->diff_pixels = diff_pixels_mvi;
  77.     }
  78. }
  79.