pixblockdsp_alpha.c

   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 }