text: /*****************************************************************************
   * pixel.c: pixel metrics
   *****************************************************************************
   * Copyright (C) 2004-2021 x264 project
   *
   * Authors: Loren Merritt <lorenm@u.washington.edu>
   *          Fiona Glaser <fiona@x264.com>
              Henrik Gramner <henrik@gramner.com>
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 2 of the License, or
   * (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111, USA.
   *
   * This program is also available under a commercial proprietary license.
   * For more information, contact us at licensing@x264.com.
   *****************************************************************************/
  
  #ifndef X264_PIXEL_H
  #define X264_PIXEL_H
  
  // SSD assumes all args aligned
  // other cmp functions assume first arg aligned
  typedef int  (*x264_pixel_cmp_t)( pixel *, intptr_t, pixel *, intptr_t );
  typedef void (*x264_pixel_cmp_x3_t)( pixel *, pixel *, pixel *, pixel *, intptr_t, int[3] );
  typedef void (*x264_pixel_cmp_x4_t)( pixel *, pixel *, pixel *, pixel *, pixel *, intptr_t, int[4] );
  
  enum
  {
      PIXEL_16x16 = 0,
      PIXEL_16x8  = 1,
      PIXEL_8x16  = 2,
      PIXEL_8x8   = 3,
      PIXEL_8x4   = 4,
      PIXEL_4x8   = 5,
      PIXEL_4x4   = 6,
  
      /* Subsampled chroma only */
      PIXEL_4x16  = 7,  /* 4:2:2 */
      PIXEL_4x2   = 8,
      PIXEL_2x8   = 9,  /* 4:2:2 */
      PIXEL_2x4   = 10,
      PIXEL_2x2   = 11,
  };
  
  static const struct { uint8_t w, h; } x264_pixel_size[12] =
  {
      { 16, 16 }, { 16, 8 }, { 8, 16 }, { 8, 8 }, { 8, 4 }, { 4, 8 }, { 4, 4 },
      {  4, 16 }, {  4, 2 }, { 2,  8 }, { 2, 4 }, { 2, 2 },
  };
  
  static const uint8_t x264_size2pixel[5][5] =
  {
      { 0, },
      { 0, PIXEL_4x4, PIXEL_8x4, 0, 0 },
      { 0, PIXEL_4x8, PIXEL_8x8, 0, PIXEL_16x8 },
      { 0, },
      { 0, 0,        PIXEL_8x16, 0, PIXEL_16x16 }
  };
  
  static const uint8_t x264_luma2chroma_pixel[4][7] =
  {
      { 0 },
      { PIXEL_8x8,   PIXEL_8x4,  PIXEL_4x8,  PIXEL_4x4, PIXEL_4x2, PIXEL_2x4, PIXEL_2x2 }, /* 4:2:0 */
      { PIXEL_8x16,  PIXEL_8x8,  PIXEL_4x16, PIXEL_4x8, PIXEL_4x4, PIXEL_2x8, PIXEL_2x4 }, /* 4:2:2 */
      { PIXEL_16x16, PIXEL_16x8, PIXEL_8x16, PIXEL_8x8, PIXEL_8x4, PIXEL_4x8, PIXEL_4x4 }, /* 4:4:4 */
  };
  
  typedef struct
  {
      x264_pixel_cmp_t  sad[8];
      x264_pixel_cmp_t  ssd[8];
      x264_pixel_cmp_t satd[8];
      x264_pixel_cmp_t ssim[7];
      x264_pixel_cmp_t sa8d[4];
      x264_pixel_cmp_t mbcmp[8]; /* either satd or sad for subpel refine and mode decision */
      x264_pixel_cmp_t mbcmp_unaligned[8]; /* unaligned mbcmp for subpel */
      x264_pixel_cmp_t fpelcmp[8]; /* either satd or sad for fullpel motion search */
      x264_pixel_cmp_x3_t fpelcmp_x3[7];
      x264_pixel_cmp_x4_t fpelcmp_x4[7];
      x264_pixel_cmp_t sad_aligned[8]; /* Aligned SAD for mbcmp */
      int (*vsad)( pixel *, intptr_t, int );
      int (*asd8)( pixel *pix1, intptr_t stride1, pixel *pix2, intptr_t stride2, int height );
      uint64_t (*sa8d_satd[1])( pixel *pix1, intptr_t stride1, pixel *pix2, intptr_t stride2 );
  
      uint64_t (*var[4])( pixel *pix, intptr_t stride );
      int (*var2[4])( pixel *fenc, pixel *fdec, int ssd[2] );
      uint64_t (*hadamard_ac[4])( pixel *pix, intptr_t stride );
  
      void (*ssd_nv12_core)( pixel *pixuv1, intptr_t stride1,
                             pixel *pixuv2, intptr_t stride2, int width, int height,
                             uint64_t *ssd_u, uint64_t *ssd_v );
      void (*ssim_4x4x2_core)( const pixel *pix1, intptr_t stride1,
                               const pixel *pix2, intptr_t stride2, int sums[2][4] );
      float (*ssim_end4)( int sum0[5][4], int sum1[5][4], int width );
  
      /* multiple parallel calls to cmp. */
      x264_pixel_cmp_x3_t sad_x3[7];
      x264_pixel_cmp_x4_t sad_x4[7];
      x264_pixel_cmp_x3_t satd_x3[7];
      x264_pixel_cmp_x4_t satd_x4[7];
  
      /* abs-diff-sum for successive elimination.
       * may round width up to a multiple of 16. */
      int (*ads[7])( int enc_dc[4], uint16_t *sums, int delta,
                     uint16_t *cost_mvx, int16_t *mvs, int width, int thresh );
  
      /* calculate satd or sad of V, H, and DC modes. */
      void (*intra_mbcmp_x3_16x16)( pixel *fenc, pixel *fdec, int res[3] );
      void (*intra_satd_x3_16x16) ( pixel *fenc, pixel *fdec, int res[3] );
      void (*intra_sad_x3_16x16)  ( pixel *fenc, pixel *fdec, int res[3] );
      void (*intra_mbcmp_x3_4x4)  ( pixel *fenc, pixel *fdec, int res[3] );
      void (*intra_satd_x3_4x4)   ( pixel *fenc, pixel *fdec, int res[3] );
      void (*intra_sad_x3_4x4)    ( pixel *fenc, pixel *fdec, int res[3] );
      void (*intra_mbcmp_x3_chroma)( pixel *fenc, pixel *fdec, int res[3] );
      void (*intra_satd_x3_chroma) ( pixel *fenc, pixel *fdec, int res[3] );
      void (*intra_sad_x3_chroma)  ( pixel *fenc, pixel *fdec, int res[3] );
      void (*intra_mbcmp_x3_8x16c) ( pixel *fenc, pixel *fdec, int res[3] );
      void (*intra_satd_x3_8x16c)  ( pixel *fenc, pixel *fdec, int res[3] );
      void (*intra_sad_x3_8x16c)   ( pixel *fenc, pixel *fdec, int res[3] );
      void (*intra_mbcmp_x3_8x8c)  ( pixel *fenc, pixel *fdec, int res[3] );
      void (*intra_satd_x3_8x8c)   ( pixel *fenc, pixel *fdec, int res[3] );
      void (*intra_sad_x3_8x8c)    ( pixel *fenc, pixel *fdec, int res[3] );
      void (*intra_mbcmp_x3_8x8)  ( pixel *fenc, pixel edge[36], int res[3] );
      void (*intra_sa8d_x3_8x8)   ( pixel *fenc, pixel edge[36], int res[3] );
      void (*intra_sad_x3_8x8)    ( pixel *fenc, pixel edge[36], int res[3] );
      /* find minimum satd or sad of all modes, and set fdec.
       * may be NULL, in which case just use pred+satd instead. */
      int (*intra_mbcmp_x9_4x4)( pixel *fenc, pixel *fdec, uint16_t *bitcosts );
      int (*intra_satd_x9_4x4) ( pixel *fenc, pixel *fdec, uint16_t *bitcosts );
      int (*intra_sad_x9_4x4)  ( pixel *fenc, pixel *fdec, uint16_t *bitcosts );
      int (*intra_mbcmp_x9_8x8)( pixel *fenc, pixel *fdec, pixel edge[36], uint16_t *bitcosts, uint16_t *satds );
      int (*intra_sa8d_x9_8x8) ( pixel *fenc, pixel *fdec, pixel edge[36], uint16_t *bitcosts, uint16_t *satds );
      int (*intra_sad_x9_8x8)  ( pixel *fenc, pixel *fdec, pixel edge[36], uint16_t *bitcosts, uint16_t *satds );
  } x264_pixel_function_t;
  
  #define x264_pixel_init x264_template(pixel_init)
  void x264_pixel_init( uint32_t cpu, x264_pixel_function_t *pixf );
  #define x264_pixel_ssd_nv12 x264_template(pixel_ssd_nv12)
  void x264_pixel_ssd_nv12   ( x264_pixel_function_t *pf, pixel *pix1, intptr_t i_pix1, pixel *pix2, intptr_t i_pix2,
                               int i_width, int i_height, uint64_t *ssd_u, uint64_t *ssd_v );
  #define x264_pixel_ssd_wxh x264_template(pixel_ssd_wxh)
  uint64_t x264_pixel_ssd_wxh( x264_pixel_function_t *pf, pixel *pix1, intptr_t i_pix1, pixel *pix2, intptr_t i_pix2,
                               int i_width, int i_height );
  #define x264_pixel_ssim_wxh x264_template(pixel_ssim_wxh)
  float x264_pixel_ssim_wxh  ( x264_pixel_function_t *pf, pixel *pix1, intptr_t i_pix1, pixel *pix2, intptr_t i_pix2,
                               int i_width, int i_height, void *buf, int *cnt );
  #define x264_field_vsad x264_template(field_vsad)
  int x264_field_vsad( x264_t *h, int mb_x, int mb_y );
  
  #endif
  