/*

 *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.

 *

 *  Use of this source code is governed by a BSD-style license

 *  that can be found in the LICENSE file in the root of the source

 *  tree. An additional intellectual property rights grant can be found

 *  in the file PATENTS.  All contributing project authors may

 *  be found in the AUTHORS file in the root of the source tree.

 */

#include <assert.h>

#include "./vpx_scale_rtcd.h"

#include "./vpx_config.h"

#include "vp9/common/vp9_blockd.h"

#include "vp9/common/vp9_reconinter.h"

#include "vp9/common/vp9_reconintra.h"

#include "vpx/vpx_integer.h"

#include "vpx_scale/yv12config.h"

#if CONFIG_VP9_HIGHBITDEPTH

void vp9_highbd_build_inter_predictor(

    const uint16_t *src, int src_stride, uint16_t *dst, int dst_stride,

    const MV *src_mv, const struct scale_factors *sf, int w, int h, int ref,

    const InterpKernel *kernel, enum mv_precision precision, int x, int y,

    int bd) {

  const int is_q4 = precision == MV_PRECISION_Q4;

  const MV mv_q4 = { is_q4 ? src_mv->row : src_mv->row * 2,

                     is_q4 ? src_mv->col : src_mv->col * 2 };

  MV32 mv = vp9_scale_mv(&mv_q4, x, y, sf);

  const int subpel_x = mv.col & SUBPEL_MASK;

  const int subpel_y = mv.row & SUBPEL_MASK;

  src += (mv.row >> SUBPEL_BITS) * src_stride + (mv.col >> SUBPEL_BITS);

  highbd_inter_predictor(src, src_stride, dst, dst_stride, subpel_x, subpel_y,

                         sf, w, h, ref, kernel, sf->x_step_q4, sf->y_step_q4,

                         bd);

}

#endif  // CONFIG_VP9_HIGHBITDEPTH

void vp9_build_inter_predictor(const uint8_t *src, int src_stride, uint8_t *dst,

                               int dst_stride, const MV *src_mv,

                               const struct scale_factors *sf, int w, int h,

                               int ref, const InterpKernel *kernel,

                               enum mv_precision precision, int x, int y) {

  const int is_q4 = precision == MV_PRECISION_Q4;

  const MV mv_q4 = { is_q4 ? src_mv->row : src_mv->row * 2,

                     is_q4 ? src_mv->col : src_mv->col * 2 };

  MV32 mv = vp9_scale_mv(&mv_q4, x, y, sf);

  const int subpel_x = mv.col & SUBPEL_MASK;

  const int subpel_y = mv.row & SUBPEL_MASK;

  src += (mv.row >> SUBPEL_BITS) * src_stride + (mv.col >> SUBPEL_BITS);

  inter_predictor(src, src_stride, dst, dst_stride, subpel_x, subpel_y, sf, w,

                  h, ref, kernel, sf->x_step_q4, sf->y_step_q4);

}

static INLINE int round_mv_comp_q4(int value) {

  return (value < 0 ? value - 2 : value + 2) / 4;

}

static MV mi_mv_pred_q4(const MODE_INFO *mi, int idx) {

  MV res = { round_mv_comp_q4(mi->bmi[0].as_mv[idx].as_mv.row +

                              mi->bmi[1].as_mv[idx].as_mv.row +

                              mi->bmi[2].as_mv[idx].as_mv.row +

                              mi->bmi[3].as_mv[idx].as_mv.row),

             round_mv_comp_q4(mi->bmi[0].as_mv[idx].as_mv.col +

                              mi->bmi[1].as_mv[idx].as_mv.col +

                              mi->bmi[2].as_mv[idx].as_mv.col +

                              mi->bmi[3].as_mv[idx].as_mv.col) };

  return res;

}

static INLINE int round_mv_comp_q2(int value) {

  return (value < 0 ? value - 1 : value + 1) / 2;

}

static MV mi_mv_pred_q2(const MODE_INFO *mi, int idx, int block0, int block1) {

  MV res = { round_mv_comp_q2(mi->bmi[block0].as_mv[idx].as_mv.row +

                              mi->bmi[block1].as_mv[idx].as_mv.row),

             round_mv_comp_q2(mi->bmi[block0].as_mv[idx].as_mv.col +

                              mi->bmi[block1].as_mv[idx].as_mv.col) };

  return res;

}

// TODO(jkoleszar): yet another mv clamping function :-(

MV clamp_mv_to_umv_border_sb(const MACROBLOCKD *xd, const MV *src_mv, int bw,

                             int bh, int ss_x, int ss_y) {

  // If the MV points so far into the UMV border that no visible pixels

  // are used for reconstruction, the subpel part of the MV can be

  // discarded and the MV limited to 16 pixels with equivalent results.

  const int spel_left = (VP9_INTERP_EXTEND + bw) << SUBPEL_BITS;

  const int spel_right = spel_left - SUBPEL_SHIFTS;

  const int spel_top = (VP9_INTERP_EXTEND + bh) << SUBPEL_BITS;

  const int spel_bottom = spel_top - SUBPEL_SHIFTS;

  MV clamped_mv = { (short)(src_mv->row * (1 << (1 - ss_y))),

                    (short)(src_mv->col * (1 << (1 - ss_x))) };

  assert(ss_x <= 1);

  assert(ss_y <= 1);

  clamp_mv(&clamped_mv, xd->mb_to_left_edge * (1 << (1 - ss_x)) - spel_left,

           xd->mb_to_right_edge * (1 << (1 - ss_x)) + spel_right,

           xd->mb_to_top_edge * (1 << (1 - ss_y)) - spel_top,

           xd->mb_to_bottom_edge * (1 << (1 - ss_y)) + spel_bottom);

  return clamped_mv;

}

MV average_split_mvs(const struct macroblockd_plane *pd, const MODE_INFO *mi,

                     int ref, int block) {

  const int ss_idx = ((pd->subsampling_x > 0) << 1) | (pd->subsampling_y > 0);

  MV res = { 0, 0 };

  switch (ss_idx) {

    case 0: res = mi->bmi[block].as_mv[ref].as_mv; break;

    case 1: res = mi_mv_pred_q2(mi, ref, block, block + 2); break;

    case 2: res = mi_mv_pred_q2(mi, ref, block, block + 1); break;

    case 3: res = mi_mv_pred_q4(mi, ref); break;

    default: assert(ss_idx <= 3 && ss_idx >= 0);

  }

  return res;

}

static void build_inter_predictors(MACROBLOCKD *xd, int plane, int block,

                                   int bw, int bh, int x, int y, int w, int h,

                                   int mi_x, int mi_y) {

  struct macroblockd_plane *const pd = &xd->plane[plane];

  const MODE_INFO *mi = xd->mi[0];

  const int is_compound = has_second_ref(mi);

  const InterpKernel *kernel = vp9_filter_kernels[mi->interp_filter];

  int ref;

  for (ref = 0; ref < 1 + is_compound; ++ref) {

    const struct scale_factors *const sf = &xd->block_refs[ref]->sf;

    struct buf_2d *const pre_buf = &pd->pre[ref];

    struct buf_2d *const dst_buf = &pd->dst;

    uint8_t *const dst = dst_buf->buf + (int64_t)dst_buf->stride * y + x;

    const MV mv = mi->sb_type < BLOCK_8X8

                      ? average_split_mvs(pd, mi, ref, block)

                      : mi->mv[ref].as_mv;

    // TODO(jkoleszar): This clamping is done in the incorrect place for the

    // scaling case. It needs to be done on the scaled MV, not the pre-scaling

    // MV. Note however that it performs the subsampling aware scaling so

    // that the result is always q4.

    // mv_precision precision is MV_PRECISION_Q4.

    const MV mv_q4 = clamp_mv_to_umv_border_sb(

        xd, &mv, bw, bh, pd->subsampling_x, pd->subsampling_y);

    uint8_t *pre;

    MV32 scaled_mv;

    int xs, ys, subpel_x, subpel_y;

    const int is_scaled = vp9_is_scaled(sf);

    if (is_scaled) {

      // Co-ordinate of containing block to pixel precision.

      const int x_start = (-xd->mb_to_left_edge >> (3 + pd->subsampling_x));

      const int y_start = (-xd->mb_to_top_edge >> (3 + pd->subsampling_y));

      const YV12_BUFFER_CONFIG *ref_buf = xd->block_refs[ref]->buf;

      uint8_t *buf_array[] = { ref_buf->y_buffer, ref_buf->u_buffer,

                               ref_buf->v_buffer };

      const int stride_array[] = { ref_buf->y_stride, ref_buf->uv_stride,

                                   ref_buf->uv_stride };

#if 0  // CONFIG_BETTER_HW_COMPATIBILITY

      assert(xd->mi[0]->sb_type != BLOCK_4X8 &&

             xd->mi[0]->sb_type != BLOCK_8X4);

      assert(mv_q4.row == mv.row * (1 << (1 - pd->subsampling_y)) &&

             mv_q4.col == mv.col * (1 << (1 - pd->subsampling_x)));

#endif

      pre_buf->buf = buf_array[plane];

      pre_buf->stride = stride_array[plane];

      pre_buf->buf +=

          scaled_buffer_offset(x_start + x, y_start + y, pre_buf->stride, sf);

      pre = pre_buf->buf;

      scaled_mv = vp9_scale_mv(&mv_q4, mi_x + x, mi_y + y, sf);

      xs = sf->x_step_q4;

      ys = sf->y_step_q4;

    } else {

      pre = pre_buf->buf + ((int64_t)y * pre_buf->stride + x);

      scaled_mv.row = mv_q4.row;

      scaled_mv.col = mv_q4.col;

      xs = ys = 16;

    }

    subpel_x = scaled_mv.col & SUBPEL_MASK;

    subpel_y = scaled_mv.row & SUBPEL_MASK;

    pre += (scaled_mv.row >> SUBPEL_BITS) * pre_buf->stride +

           (scaled_mv.col >> SUBPEL_BITS);

#if CONFIG_VP9_HIGHBITDEPTH

    if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {

      highbd_inter_predictor(CONVERT_TO_SHORTPTR(pre), pre_buf->stride,

                             CONVERT_TO_SHORTPTR(dst), dst_buf->stride,

                             subpel_x, subpel_y, sf, w, h, ref, kernel, xs, ys,

                             xd->bd);

    } else {

      inter_predictor(pre, pre_buf->stride, dst, dst_buf->stride, subpel_x,

                      subpel_y, sf, w, h, ref, kernel, xs, ys);

    }

#else

    inter_predictor(pre, pre_buf->stride, dst, dst_buf->stride, subpel_x,

                    subpel_y, sf, w, h, ref, kernel, xs, ys);

#endif  // CONFIG_VP9_HIGHBITDEPTH

  }

}

static void build_inter_predictors_for_planes(MACROBLOCKD *xd, BLOCK_SIZE bsize,

                                              int mi_row, int mi_col,

                                              int plane_from, int plane_to) {

  int plane;

  const int mi_x = mi_col * MI_SIZE;

  const int mi_y = mi_row * MI_SIZE;

  for (plane = plane_from; plane <= plane_to; ++plane) {

    const BLOCK_SIZE plane_bsize =

        get_plane_block_size(bsize, &xd->plane[plane]);

    const int num_4x4_w = num_4x4_blocks_wide_lookup[plane_bsize];

    const int num_4x4_h = num_4x4_blocks_high_lookup[plane_bsize];

    const int bw = 4 * num_4x4_w;

    const int bh = 4 * num_4x4_h;

    if (xd->mi[0]->sb_type < BLOCK_8X8) {

      int i = 0, x, y;

      assert(bsize == BLOCK_8X8);

      for (y = 0; y < num_4x4_h; ++y)

        for (x = 0; x < num_4x4_w; ++x)

          build_inter_predictors(xd, plane, i++, bw, bh, 4 * x, 4 * y, 4, 4,

                                 mi_x, mi_y);

    } else {

      build_inter_predictors(xd, plane, 0, bw, bh, 0, 0, bw, bh, mi_x, mi_y);

    }

  }

}

void vp9_build_inter_predictors_sby(MACROBLOCKD *xd, int mi_row, int mi_col,

                                    BLOCK_SIZE bsize) {

  build_inter_predictors_for_planes(xd, bsize, mi_row, mi_col, 0, 0);

}

void vp9_build_inter_predictors_sbp(MACROBLOCKD *xd, int mi_row, int mi_col,

                                    BLOCK_SIZE bsize, int plane) {

  build_inter_predictors_for_planes(xd, bsize, mi_row, mi_col, plane, plane);

}

void vp9_build_inter_predictors_sbuv(MACROBLOCKD *xd, int mi_row, int mi_col,

                                     BLOCK_SIZE bsize) {

  build_inter_predictors_for_planes(xd, bsize, mi_row, mi_col, 1,

                                    MAX_MB_PLANE - 1);

}

void vp9_build_inter_predictors_sb(MACROBLOCKD *xd, int mi_row, int mi_col,

                                   BLOCK_SIZE bsize) {

  build_inter_predictors_for_planes(xd, bsize, mi_row, mi_col, 0,

                                    MAX_MB_PLANE - 1);

}

void vp9_setup_dst_planes(struct macroblockd_plane planes[MAX_MB_PLANE],

                          const YV12_BUFFER_CONFIG *src, int mi_row,

                          int mi_col) {

  uint8_t *const buffers[MAX_MB_PLANE] = { src->y_buffer, src->u_buffer,

                                           src->v_buffer };

  const int strides[MAX_MB_PLANE] = { src->y_stride, src->uv_stride,

                                      src->uv_stride };

  int i;

  for (i = 0; i < MAX_MB_PLANE; ++i) {

    struct macroblockd_plane *const pd = &planes[i];

    setup_pred_plane(&pd->dst, buffers[i], strides[i], mi_row, mi_col, NULL,

                     pd->subsampling_x, pd->subsampling_y);

  }

}

void vp9_setup_pre_planes(MACROBLOCKD *xd, int idx,

                          const YV12_BUFFER_CONFIG *src, int mi_row, int mi_col,

                          const struct scale_factors *sf) {

  if (src != NULL) {

    int i;

    uint8_t *const buffers[MAX_MB_PLANE] = { src->y_buffer, src->u_buffer,

                                             src->v_buffer };

    const int strides[MAX_MB_PLANE] = { src->y_stride, src->uv_stride,

                                        src->uv_stride };

    for (i = 0; i < MAX_MB_PLANE; ++i) {

      struct macroblockd_plane *const pd = &xd->plane[i];

      setup_pred_plane(&pd->pre[idx], buffers[i], strides[i], mi_row, mi_col,

                       sf, pd->subsampling_x, pd->subsampling_y);

    }

  }

}