/*

 * Copyright (c) 2016, Alliance for Open Media. All rights reserved

 *

 * This source code is subject to the terms of the BSD 2 Clause License and

 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License

 * was not distributed with this source code in the LICENSE file, you can

 * obtain it at www.aomedia.org/license/software. If the Alliance for Open

 * Media Patent License 1.0 was not distributed with this source code in the

 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.

 */

#include <assert.h>

#include <math.h>

#include <string.h>

#include "config/aom_scale_rtcd.h"

#include "aom/aom_integer.h"

#include "av1/common/av1_common_int.h"

#include "av1/common/cdef.h"

#include "av1/common/cdef_block.h"

#include "av1/common/reconinter.h"

static int is_8x8_block_skip(MB_MODE_INFO **grid, int mi_row, int mi_col,

                             int mi_stride) {

  MB_MODE_INFO **mbmi = grid + mi_row * mi_stride + mi_col;

  for (int r = 0; r < mi_size_high[BLOCK_8X8]; ++r, mbmi += mi_stride) {

    for (int c = 0; c < mi_size_wide[BLOCK_8X8]; ++c) {

      if (!mbmi[c]->skip_txfm) return 0;

    }

  }

  return 1;

}

int av1_cdef_compute_sb_list(const CommonModeInfoParams *const mi_params,

                             int mi_row, int mi_col, cdef_list *dlist,

                             BLOCK_SIZE bs) {

  MB_MODE_INFO **grid = mi_params->mi_grid_base;

  int maxc = mi_params->mi_cols - mi_col;

  int maxr = mi_params->mi_rows - mi_row;

  if (bs == BLOCK_128X128 || bs == BLOCK_128X64)

    maxc = AOMMIN(maxc, MI_SIZE_128X128);

  else

    maxc = AOMMIN(maxc, MI_SIZE_64X64);

  if (bs == BLOCK_128X128 || bs == BLOCK_64X128)

    maxr = AOMMIN(maxr, MI_SIZE_128X128);

  else

    maxr = AOMMIN(maxr, MI_SIZE_64X64);

  const int r_step = 2;  // mi_size_high[BLOCK_8X8]

  const int c_step = 2;  // mi_size_wide[BLOCK_8X8]

  const int r_shift = 1;

  const int c_shift = 1;

  int count = 0;

  for (int r = 0; r < maxr; r += r_step) {

    for (int c = 0; c < maxc; c += c_step) {

      if (!is_8x8_block_skip(grid, mi_row + r, mi_col + c,

                             mi_params->mi_stride)) {

        dlist[count].by = r >> r_shift;

        dlist[count].bx = c >> c_shift;

        count++;

      }

    }

  }

  return count;

}

void cdef_copy_rect8_8bit_to_16bit_c(uint16_t *dst, int dstride,

                                     const uint8_t *src, int sstride, int width,

                                     int height) {

  for (int i = 0; i < height; i++) {

    for (int j = 0; j < width; j++) {

      dst[i * dstride + j] = src[i * sstride + j];

    }

  }

}

void cdef_copy_rect8_16bit_to_16bit_c(uint16_t *dst, int dstride,

                                      const uint16_t *src, int sstride,

                                      int width, int height) {

  for (int i = 0; i < height; i++) {

    for (int j = 0; j < width; j++) {

      dst[i * dstride + j] = src[i * sstride + j];

    }

  }

}

void av1_cdef_copy_sb8_16_lowbd(uint16_t *const dst, int dstride,

                                const uint8_t *src, int src_voffset,

                                int src_hoffset, int sstride, int vsize,

                                int hsize) {

  const uint8_t *base = &src[src_voffset * sstride + src_hoffset];

  cdef_copy_rect8_8bit_to_16bit(dst, dstride, base, sstride, hsize, vsize);

}

void av1_cdef_copy_sb8_16_highbd(uint16_t *const dst, int dstride,

                                 const uint8_t *src, int src_voffset,

                                 int src_hoffset, int sstride, int vsize,

                                 int hsize) {

  const uint16_t *base =

      &CONVERT_TO_SHORTPTR(src)[src_voffset * sstride + src_hoffset];

  cdef_copy_rect8_16bit_to_16bit(dst, dstride, base, sstride, hsize, vsize);

}

void av1_cdef_copy_sb8_16(const AV1_COMMON *const cm, uint16_t *const dst,

                          int dstride, const uint8_t *src, int src_voffset,

                          int src_hoffset, int sstride, int vsize, int hsize) {

  if (cm->seq_params->use_highbitdepth) {

    av1_cdef_copy_sb8_16_highbd(dst, dstride, src, src_voffset, src_hoffset,

                                sstride, vsize, hsize);

  } else {

    av1_cdef_copy_sb8_16_lowbd(dst, dstride, src, src_voffset, src_hoffset,

                               sstride, vsize, hsize);

  }

}

static INLINE void copy_rect(uint16_t *dst, int dstride, const uint16_t *src,

                             int sstride, int v, int h) {

  for (int i = 0; i < v; i++) {

    for (int j = 0; j < h; j++) {

      dst[i * dstride + j] = src[i * sstride + j];

    }

  }

}

// Prepares intermediate input buffer for CDEF.

// Inputs:

//   cm: Pointer to common structure.

//   fb_info: Pointer to the CDEF block-level parameter structure.

//   colbuf: Left column buffer for CDEF.

//   cdef_left: Left block is filtered or not.

//   fbc, fbr: col and row index of a block.

//   plane: plane index Y/CB/CR.

// Returns:

//   Nothing will be returned.

static void cdef_prepare_fb(const AV1_COMMON *const cm, CdefBlockInfo *fb_info,

                            uint16_t **const colbuf, const int cdef_left,

                            int fbc, int fbr, int plane) {

  const CommonModeInfoParams *const mi_params = &cm->mi_params;

  uint16_t *src = fb_info->src;

  const int luma_stride =

      ALIGN_POWER_OF_TWO(mi_params->mi_cols << MI_SIZE_LOG2, 4);

  const int nvfb = (mi_params->mi_rows + MI_SIZE_64X64 - 1) / MI_SIZE_64X64;

  const int nhfb = (mi_params->mi_cols + MI_SIZE_64X64 - 1) / MI_SIZE_64X64;

  int cstart = 0;

  if (!cdef_left) cstart = -CDEF_HBORDER;

  int rend, cend;

  const int nhb =

      AOMMIN(MI_SIZE_64X64, mi_params->mi_cols - MI_SIZE_64X64 * fbc);

  const int nvb =

      AOMMIN(MI_SIZE_64X64, mi_params->mi_rows - MI_SIZE_64X64 * fbr);

  const int hsize = nhb << fb_info->mi_wide_l2;

  const int vsize = nvb << fb_info->mi_high_l2;

  const uint16_t *top_linebuf = fb_info->top_linebuf[plane];

  const uint16_t *bot_linebuf = fb_info->bot_linebuf[plane];

  const int bot_offset = (vsize + CDEF_VBORDER) * CDEF_BSTRIDE;

  const int stride =

      luma_stride >> (plane == AOM_PLANE_Y ? 0 : cm->seq_params->subsampling_x);

  if (fbc == nhfb - 1)

    cend = hsize;

  else

    cend = hsize + CDEF_HBORDER;

  if (fbr == nvfb - 1)

    rend = vsize;

  else

    rend = vsize + CDEF_VBORDER;

  /* Copy in the pixels we need from the current superblock for

  deringing.*/

  av1_cdef_copy_sb8_16(

      cm, &src[CDEF_VBORDER * CDEF_BSTRIDE + CDEF_HBORDER + cstart],

      CDEF_BSTRIDE, fb_info->dst, fb_info->roffset, fb_info->coffset + cstart,

      fb_info->dst_stride, vsize, cend - cstart);

  /* Copy in the pixels we need for the current superblock from bottom buffer.*/

  if (fbr < nvfb - 1) {

    copy_rect(&src[bot_offset + CDEF_HBORDER], CDEF_BSTRIDE,

              &bot_linebuf[fb_info->coffset], stride, CDEF_VBORDER, hsize);

  } else {

    fill_rect(&src[bot_offset + CDEF_HBORDER], CDEF_BSTRIDE, CDEF_VBORDER,

              hsize, CDEF_VERY_LARGE);

  }

  if (fbr < nvfb - 1 && fbc > 0) {

    copy_rect(&src[bot_offset], CDEF_BSTRIDE,

              &bot_linebuf[fb_info->coffset - CDEF_HBORDER], stride,

              CDEF_VBORDER, CDEF_HBORDER);

  } else {

    fill_rect(&src[bot_offset], CDEF_BSTRIDE, CDEF_VBORDER, CDEF_HBORDER,

              CDEF_VERY_LARGE);

  }

  if (fbr < nvfb - 1 && fbc < nhfb - 1) {

    copy_rect(&src[bot_offset + hsize + CDEF_HBORDER], CDEF_BSTRIDE,

              &bot_linebuf[fb_info->coffset + hsize], stride, CDEF_VBORDER,

              CDEF_HBORDER);

  } else {

    fill_rect(&src[bot_offset + hsize + CDEF_HBORDER], CDEF_BSTRIDE,

              CDEF_VBORDER, CDEF_HBORDER, CDEF_VERY_LARGE);

  }

  /* Copy in the pixels we need from the current superblock from top buffer.*/

  if (fbr > 0) {

    copy_rect(&src[CDEF_HBORDER], CDEF_BSTRIDE, &top_linebuf[fb_info->coffset],

              stride, CDEF_VBORDER, hsize);

  } else {

    fill_rect(&src[CDEF_HBORDER], CDEF_BSTRIDE, CDEF_VBORDER, hsize,

              CDEF_VERY_LARGE);

  }

  if (fbr > 0 && fbc > 0) {

    copy_rect(src, CDEF_BSTRIDE, &top_linebuf[fb_info->coffset - CDEF_HBORDER],

              stride, CDEF_VBORDER, CDEF_HBORDER);

  } else {

    fill_rect(src, CDEF_BSTRIDE, CDEF_VBORDER, CDEF_HBORDER, CDEF_VERY_LARGE);

  }

  if (fbr > 0 && fbc < nhfb - 1) {

    copy_rect(&src[hsize + CDEF_HBORDER], CDEF_BSTRIDE,

              &top_linebuf[fb_info->coffset + hsize], stride, CDEF_VBORDER,

              CDEF_HBORDER);

  } else {

    fill_rect(&src[hsize + CDEF_HBORDER], CDEF_BSTRIDE, CDEF_VBORDER,

              CDEF_HBORDER, CDEF_VERY_LARGE);

  }

  if (cdef_left) {

    /* If we deringed the superblock on the left then we need to copy in

    saved pixels. */

    copy_rect(src, CDEF_BSTRIDE, colbuf[plane], CDEF_HBORDER,

              rend + CDEF_VBORDER, CDEF_HBORDER);

  }

  /* Saving pixels in case we need to dering the superblock on the

  right. */

  copy_rect(colbuf[plane], CDEF_HBORDER, src + hsize, CDEF_BSTRIDE,

            rend + CDEF_VBORDER, CDEF_HBORDER);

  if (fb_info->frame_boundary[LEFT]) {

    fill_rect(src, CDEF_BSTRIDE, vsize + 2 * CDEF_VBORDER, CDEF_HBORDER,

              CDEF_VERY_LARGE);

  }

  if (fb_info->frame_boundary[RIGHT]) {

    fill_rect(&src[hsize + CDEF_HBORDER], CDEF_BSTRIDE,

              vsize + 2 * CDEF_VBORDER, CDEF_HBORDER, CDEF_VERY_LARGE);

  }

}

static INLINE void cdef_filter_fb(CdefBlockInfo *const fb_info, int plane,

                                  uint8_t use_highbitdepth) {

  int offset = fb_info->dst_stride * fb_info->roffset + fb_info->coffset;

  if (use_highbitdepth) {

    av1_cdef_filter_fb(

        NULL, CONVERT_TO_SHORTPTR(fb_info->dst + offset), fb_info->dst_stride,

        &fb_info->src[CDEF_VBORDER * CDEF_BSTRIDE + CDEF_HBORDER],

        fb_info->xdec, fb_info->ydec, fb_info->dir, NULL, fb_info->var, plane,

        fb_info->dlist, fb_info->cdef_count, fb_info->level,

        fb_info->sec_strength, fb_info->damping, fb_info->coeff_shift);

  } else {

    av1_cdef_filter_fb(

        fb_info->dst + offset, NULL, fb_info->dst_stride,

        &fb_info->src[CDEF_VBORDER * CDEF_BSTRIDE + CDEF_HBORDER],

        fb_info->xdec, fb_info->ydec, fb_info->dir, NULL, fb_info->var, plane,

        fb_info->dlist, fb_info->cdef_count, fb_info->level,

        fb_info->sec_strength, fb_info->damping, fb_info->coeff_shift);

  }

}

// Initializes block-level parameters for CDEF.

static INLINE void cdef_init_fb_col(const MACROBLOCKD *const xd,

                                    CdefBlockInfo *const fb_info, int *level,

                                    int *sec_strength, int fbc, int fbr,

                                    int plane) {

  const PLANE_TYPE plane_type = get_plane_type(plane);

  fb_info->level = level[plane_type];

  fb_info->sec_strength = sec_strength[plane_type];

  fb_info->dst = xd->plane[plane].dst.buf;

  fb_info->dst_stride = xd->plane[plane].dst.stride;

  fb_info->xdec = xd->plane[plane].subsampling_x;

  fb_info->ydec = xd->plane[plane].subsampling_y;

  fb_info->mi_wide_l2 = MI_SIZE_LOG2 - xd->plane[plane].subsampling_x;

  fb_info->mi_high_l2 = MI_SIZE_LOG2 - xd->plane[plane].subsampling_y;

  fb_info->roffset = MI_SIZE_64X64 * fbr << fb_info->mi_high_l2;

  fb_info->coffset = MI_SIZE_64X64 * fbc << fb_info->mi_wide_l2;

}

static void cdef_fb_col(const AV1_COMMON *const cm, const MACROBLOCKD *const xd,

                        CdefBlockInfo *const fb_info, uint16_t **const colbuf,

                        int *cdef_left, int fbc, int fbr) {

  const CommonModeInfoParams *const mi_params = &cm->mi_params;

  const int mbmi_cdef_strength =

      mi_params

          ->mi_grid_base[MI_SIZE_64X64 * fbr * mi_params->mi_stride +

                         MI_SIZE_64X64 * fbc]

          ->cdef_strength;

  const int num_planes = av1_num_planes(cm);

  int is_zero_level[PLANE_TYPES] = { 1, 1 };

  int level[PLANE_TYPES] = { 0 };

  int sec_strength[PLANE_TYPES] = { 0 };

  const CdefInfo *const cdef_info = &cm->cdef_info;

  if (mi_params->mi_grid_base[MI_SIZE_64X64 * fbr * mi_params->mi_stride +

                              MI_SIZE_64X64 * fbc] == NULL ||

      mbmi_cdef_strength == -1) {

    av1_zero_array(cdef_left, num_planes);

    return;

  }

  // Compute level and secondary strength for planes

  level[PLANE_TYPE_Y] =

      cdef_info->cdef_strengths[mbmi_cdef_strength] / CDEF_SEC_STRENGTHS;

  sec_strength[PLANE_TYPE_Y] =

      cdef_info->cdef_strengths[mbmi_cdef_strength] % CDEF_SEC_STRENGTHS;

  sec_strength[PLANE_TYPE_Y] += sec_strength[PLANE_TYPE_Y] == 3;

  is_zero_level[PLANE_TYPE_Y] =

      (level[PLANE_TYPE_Y] == 0) && (sec_strength[PLANE_TYPE_Y] == 0);

  if (num_planes > 1) {

    level[PLANE_TYPE_UV] =

        cdef_info->cdef_uv_strengths[mbmi_cdef_strength] / CDEF_SEC_STRENGTHS;

    sec_strength[PLANE_TYPE_UV] =

        cdef_info->cdef_uv_strengths[mbmi_cdef_strength] % CDEF_SEC_STRENGTHS;

    sec_strength[PLANE_TYPE_UV] += sec_strength[PLANE_TYPE_UV] == 3;

    is_zero_level[PLANE_TYPE_UV] =

        (level[PLANE_TYPE_UV] == 0) && (sec_strength[PLANE_TYPE_UV] == 0);

  }

  if (is_zero_level[PLANE_TYPE_Y] && is_zero_level[PLANE_TYPE_UV]) {

    av1_zero_array(cdef_left, num_planes);

    return;

  }

  fb_info->cdef_count = av1_cdef_compute_sb_list(mi_params, fbr * MI_SIZE_64X64,

                                                 fbc * MI_SIZE_64X64,

                                                 fb_info->dlist, BLOCK_64X64);

  if (!fb_info->cdef_count) {

    av1_zero_array(cdef_left, num_planes);

    return;

  }

  for (int plane = 0; plane < num_planes; plane++) {

    // Do not skip cdef filtering for luma plane as filter direction is

    // computed based on luma.

    if (plane && is_zero_level[get_plane_type(plane)]) {

      cdef_left[plane] = 0;

      continue;

    }

    cdef_init_fb_col(xd, fb_info, level, sec_strength, fbc, fbr, plane);

    cdef_prepare_fb(cm, fb_info, colbuf, cdef_left[plane], fbc, fbr, plane);

    cdef_filter_fb(fb_info, plane, cm->seq_params->use_highbitdepth);

    cdef_left[plane] = 1;

  }

}

// Initializes row-level parameters for CDEF frame.

void av1_cdef_init_fb_row(const AV1_COMMON *const cm,

                          const MACROBLOCKD *const xd,

                          CdefBlockInfo *const fb_info,

                          uint16_t **const linebuf, uint16_t *const src,

                          struct AV1CdefSyncData *const cdef_sync, int fbr) {

  (void)cdef_sync;

  const int num_planes = av1_num_planes(cm);

  const int nvfb = (cm->mi_params.mi_rows + MI_SIZE_64X64 - 1) / MI_SIZE_64X64;

  const int luma_stride =

      ALIGN_POWER_OF_TWO(cm->mi_params.mi_cols << MI_SIZE_LOG2, 4);

  const bool ping_pong = fbr & 1;

  // for the current filter block, it's top left corner mi structure (mi_tl)

  // is first accessed to check whether the top and left boundaries are

  // frame boundaries. Then bottom-left and top-right mi structures are

  // accessed to check whether the bottom and right boundaries

  // (respectively) are frame boundaries.

  //

  // Note that we can't just check the bottom-right mi structure - eg. if

  // we're at the right-hand edge of the frame but not the bottom, then

  // the bottom-right mi is NULL but the bottom-left is not.

  fb_info->frame_boundary[TOP] = (MI_SIZE_64X64 * fbr == 0) ? 1 : 0;

  if (fbr != nvfb - 1)

    fb_info->frame_boundary[BOTTOM] =

        (MI_SIZE_64X64 * (fbr + 1) == cm->mi_params.mi_rows) ? 1 : 0;

  else

    fb_info->frame_boundary[BOTTOM] = 1;

  fb_info->src = src;

  fb_info->damping = cm->cdef_info.cdef_damping;

  fb_info->coeff_shift = AOMMAX(cm->seq_params->bit_depth - 8, 0);

  av1_zero(fb_info->dir);

  av1_zero(fb_info->var);

  for (int plane = 0; plane < num_planes; plane++) {

    const int mi_high_l2 = MI_SIZE_LOG2 - xd->plane[plane].subsampling_y;

    const int offset = MI_SIZE_64X64 * (fbr + 1) << mi_high_l2;

    const int stride = luma_stride >> xd->plane[plane].subsampling_x;

    // here ping-pong buffers are maintained for top linebuf

    // to avoid linebuf over-write by consecutive row.

    uint16_t *const top_linebuf =

        &linebuf[plane][ping_pong * CDEF_VBORDER * stride];

    fb_info->bot_linebuf[plane] = &linebuf[plane][(CDEF_VBORDER << 1) * stride];

    if (fbr != nvfb - 1)  // top line buffer copy

      av1_cdef_copy_sb8_16(cm, top_linebuf, stride, xd->plane[plane].dst.buf,

                           offset - CDEF_VBORDER, 0,

                           xd->plane[plane].dst.stride, CDEF_VBORDER, stride);

    fb_info->top_linebuf[plane] =

        &linebuf[plane][(!ping_pong) * CDEF_VBORDER * stride];

    if (fbr != nvfb - 1)  // bottom line buffer copy

      av1_cdef_copy_sb8_16(cm, fb_info->bot_linebuf[plane], stride,

                           xd->plane[plane].dst.buf, offset, 0,

                           xd->plane[plane].dst.stride, CDEF_VBORDER, stride);

  }

}

void av1_cdef_fb_row(const AV1_COMMON *const cm, MACROBLOCKD *xd,

                     uint16_t **const linebuf, uint16_t **const colbuf,

                     uint16_t *const src, int fbr,

                     cdef_init_fb_row_t cdef_init_fb_row_fn,

                     struct AV1CdefSyncData *const cdef_sync) {

  CdefBlockInfo fb_info;

  int cdef_left[MAX_MB_PLANE] = { 1, 1, 1 };

  const int nhfb = (cm->mi_params.mi_cols + MI_SIZE_64X64 - 1) / MI_SIZE_64X64;

  cdef_init_fb_row_fn(cm, xd, &fb_info, linebuf, src, cdef_sync, fbr);

  for (int fbc = 0; fbc < nhfb; fbc++) {

    fb_info.frame_boundary[LEFT] = (MI_SIZE_64X64 * fbc == 0) ? 1 : 0;

    if (fbc != nhfb - 1)

      fb_info.frame_boundary[RIGHT] =

          (MI_SIZE_64X64 * (fbc + 1) == cm->mi_params.mi_cols) ? 1 : 0;

    else

      fb_info.frame_boundary[RIGHT] = 1;

    cdef_fb_col(cm, xd, &fb_info, colbuf, &cdef_left[0], fbc, fbr);

  }

}

// Perform CDEF on input frame.

// Inputs:

//   frame: Pointer to input frame buffer.

//   cm: Pointer to common structure.

//   xd: Pointer to common current coding block structure.

// Returns:

//   Nothing will be returned.

void av1_cdef_frame(YV12_BUFFER_CONFIG *frame, AV1_COMMON *const cm,

                    MACROBLOCKD *xd, cdef_init_fb_row_t cdef_init_fb_row_fn) {

  const int num_planes = av1_num_planes(cm);

  const int nvfb = (cm->mi_params.mi_rows + MI_SIZE_64X64 - 1) / MI_SIZE_64X64;

  av1_setup_dst_planes(xd->plane, cm->seq_params->sb_size, frame, 0, 0, 0,

                       num_planes);

  for (int fbr = 0; fbr < nvfb; fbr++)

    av1_cdef_fb_row(cm, xd, cm->cdef_info.linebuf, cm->cdef_info.colbuf,

                    cm->cdef_info.srcbuf, fbr, cdef_init_fb_row_fn, NULL);

}