/*

 * 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 "config/aom_dsp_rtcd.h"

#include "config/av1_rtcd.h"

#include "aom_dsp/txfm_common.h"

#include "av1/common/enums.h"

#include "av1/common/av1_txfm.h"

#include "av1/encoder/av1_fwd_txfm1d.h"

#include "av1/encoder/av1_fwd_txfm1d_cfg.h"

static INLINE TxfmFunc fwd_txfm_type_to_func(TXFM_TYPE txfm_type) {

  switch (txfm_type) {

    case TXFM_TYPE_DCT4: return av1_fdct4;

    case TXFM_TYPE_DCT8: return av1_fdct8;

    case TXFM_TYPE_DCT16: return av1_fdct16;

    case TXFM_TYPE_DCT32: return av1_fdct32;

    case TXFM_TYPE_DCT64: return av1_fdct64;

    case TXFM_TYPE_ADST4: return av1_fadst4;

    case TXFM_TYPE_ADST8: return av1_fadst8;

    case TXFM_TYPE_ADST16: return av1_fadst16;

    case TXFM_TYPE_IDENTITY4: return av1_fidentity4_c;

    case TXFM_TYPE_IDENTITY8: return av1_fidentity8_c;

    case TXFM_TYPE_IDENTITY16: return av1_fidentity16_c;

    case TXFM_TYPE_IDENTITY32: return av1_fidentity32_c;

    default: assert(0); return NULL;

  }

}

void av1_gen_fwd_stage_range(int8_t *stage_range_col, int8_t *stage_range_row,

                             const TXFM_2D_FLIP_CFG *cfg, int bd) {

  // Take the shift from the larger dimension in the rectangular case.

  const int8_t *shift = cfg->shift;

  // i < MAX_TXFM_STAGE_NUM will mute above array bounds warning

  for (int i = 0; i < cfg->stage_num_col && i < MAX_TXFM_STAGE_NUM; ++i) {

    stage_range_col[i] = cfg->stage_range_col[i] + shift[0] + bd + 1;

  }

  // i < MAX_TXFM_STAGE_NUM will mute above array bounds warning

  for (int i = 0; i < cfg->stage_num_row && i < MAX_TXFM_STAGE_NUM; ++i) {

    stage_range_row[i] = cfg->stage_range_row[i] + shift[0] + shift[1] + bd + 1;

  }

}

static INLINE void fwd_txfm2d_c(const int16_t *input, int32_t *output,

                                const int stride, const TXFM_2D_FLIP_CFG *cfg,

                                int32_t *buf, int bd) {

  int c, r;

  // Note when assigning txfm_size_col, we use the txfm_size from the

  // row configuration and vice versa. This is intentionally done to

  // accurately perform rectangular transforms. When the transform is

  // rectangular, the number of columns will be the same as the

  // txfm_size stored in the row cfg struct. It will make no difference

  // for square transforms.

  const int txfm_size_col = tx_size_wide[cfg->tx_size];

  const int txfm_size_row = tx_size_high[cfg->tx_size];

  // Take the shift from the larger dimension in the rectangular case.

  const int8_t *shift = cfg->shift;

  const int rect_type = get_rect_tx_log_ratio(txfm_size_col, txfm_size_row);

  int8_t stage_range_col[MAX_TXFM_STAGE_NUM];

  int8_t stage_range_row[MAX_TXFM_STAGE_NUM];

  assert(cfg->stage_num_col <= MAX_TXFM_STAGE_NUM);

  assert(cfg->stage_num_row <= MAX_TXFM_STAGE_NUM);

  av1_gen_fwd_stage_range(stage_range_col, stage_range_row, cfg, bd);

  const int8_t cos_bit_col = cfg->cos_bit_col;

  const int8_t cos_bit_row = cfg->cos_bit_row;

  const TxfmFunc txfm_func_col = fwd_txfm_type_to_func(cfg->txfm_type_col);

  const TxfmFunc txfm_func_row = fwd_txfm_type_to_func(cfg->txfm_type_row);

  // use output buffer as temp buffer

  int32_t *temp_in = output;

  int32_t *temp_out = output + txfm_size_row;

  // Columns

  for (c = 0; c < txfm_size_col; ++c) {

    if (cfg->ud_flip == 0) {

      for (r = 0; r < txfm_size_row; ++r) temp_in[r] = input[r * stride + c];

    } else {

      for (r = 0; r < txfm_size_row; ++r)

        // flip upside down

        temp_in[r] = input[(txfm_size_row - r - 1) * stride + c];

    }

    av1_round_shift_array(temp_in, txfm_size_row, -shift[0]);

    txfm_func_col(temp_in, temp_out, cos_bit_col, stage_range_col);

    av1_round_shift_array(temp_out, txfm_size_row, -shift[1]);

    if (cfg->lr_flip == 0) {

      for (r = 0; r < txfm_size_row; ++r)

        buf[r * txfm_size_col + c] = temp_out[r];

    } else {

      for (r = 0; r < txfm_size_row; ++r)

        // flip from left to right

        buf[r * txfm_size_col + (txfm_size_col - c - 1)] = temp_out[r];

    }

  }

  // Rows

  for (r = 0; r < txfm_size_row; ++r) {

    txfm_func_row(buf + r * txfm_size_col, output + r * txfm_size_col,

                  cos_bit_row, stage_range_row);

    av1_round_shift_array(output + r * txfm_size_col, txfm_size_col, -shift[2]);

    if (abs(rect_type) == 1) {

      // Multiply everything by Sqrt2 if the transform is rectangular and the

      // size difference is a factor of 2.

      for (c = 0; c < txfm_size_col; ++c) {

        output[r * txfm_size_col + c] = round_shift(

            (int64_t)output[r * txfm_size_col + c] * NewSqrt2, NewSqrt2Bits);

      }

    }

  }

}

void av1_fwd_txfm2d_4x8_c(const int16_t *input, int32_t *output, int stride,

                          TX_TYPE tx_type, int bd) {

  DECLARE_ALIGNED(32, int32_t, txfm_buf[4 * 8]);

  TXFM_2D_FLIP_CFG cfg;

  av1_get_fwd_txfm_cfg(tx_type, TX_4X8, &cfg);

  fwd_txfm2d_c(input, output, stride, &cfg, txfm_buf, bd);

}

void av1_fwd_txfm2d_8x4_c(const int16_t *input, int32_t *output, int stride,

                          TX_TYPE tx_type, int bd) {

  int32_t txfm_buf[8 * 4];

  TXFM_2D_FLIP_CFG cfg;

  av1_get_fwd_txfm_cfg(tx_type, TX_8X4, &cfg);

  fwd_txfm2d_c(input, output, stride, &cfg, txfm_buf, bd);

}

void av1_fwd_txfm2d_8x16_c(const int16_t *input, int32_t *output, int stride,

                           TX_TYPE tx_type, int bd) {

  DECLARE_ALIGNED(32, int32_t, txfm_buf[8 * 16]);

  TXFM_2D_FLIP_CFG cfg;

  av1_get_fwd_txfm_cfg(tx_type, TX_8X16, &cfg);

  fwd_txfm2d_c(input, output, stride, &cfg, txfm_buf, bd);

}

void av1_fwd_txfm2d_16x8_c(const int16_t *input, int32_t *output, int stride,

                           TX_TYPE tx_type, int bd) {

  int32_t txfm_buf[16 * 8];

  TXFM_2D_FLIP_CFG cfg;

  av1_get_fwd_txfm_cfg(tx_type, TX_16X8, &cfg);

  fwd_txfm2d_c(input, output, stride, &cfg, txfm_buf, bd);

}

void av1_fwd_txfm2d_16x32_c(const int16_t *input, int32_t *output, int stride,

                            TX_TYPE tx_type, int bd) {

  DECLARE_ALIGNED(32, int32_t, txfm_buf[16 * 32]);

  TXFM_2D_FLIP_CFG cfg;

  av1_get_fwd_txfm_cfg(tx_type, TX_16X32, &cfg);

  fwd_txfm2d_c(input, output, stride, &cfg, txfm_buf, bd);

}

void av1_fwd_txfm2d_32x16_c(const int16_t *input, int32_t *output, int stride,

                            TX_TYPE tx_type, int bd) {

  int32_t txfm_buf[32 * 16];

  TXFM_2D_FLIP_CFG cfg;

  av1_get_fwd_txfm_cfg(tx_type, TX_32X16, &cfg);

  fwd_txfm2d_c(input, output, stride, &cfg, txfm_buf, bd);

}

void av1_fwd_txfm2d_4x16_c(const int16_t *input, int32_t *output, int stride,

                           TX_TYPE tx_type, int bd) {

  DECLARE_ALIGNED(32, int32_t, txfm_buf[4 * 16]);

  TXFM_2D_FLIP_CFG cfg;

  av1_get_fwd_txfm_cfg(tx_type, TX_4X16, &cfg);

  fwd_txfm2d_c(input, output, stride, &cfg, txfm_buf, bd);

}

void av1_fwd_txfm2d_16x4_c(const int16_t *input, int32_t *output, int stride,

                           TX_TYPE tx_type, int bd) {

  int32_t txfm_buf[16 * 4];

  TXFM_2D_FLIP_CFG cfg;

  av1_get_fwd_txfm_cfg(tx_type, TX_16X4, &cfg);

  fwd_txfm2d_c(input, output, stride, &cfg, txfm_buf, bd);

}

void av1_fwd_txfm2d_8x32_c(const int16_t *input, int32_t *output, int stride,

                           TX_TYPE tx_type, int bd) {

  DECLARE_ALIGNED(32, int32_t, txfm_buf[32 * 8]);

  TXFM_2D_FLIP_CFG cfg;

  av1_get_fwd_txfm_cfg(tx_type, TX_8X32, &cfg);

  fwd_txfm2d_c(input, output, stride, &cfg, txfm_buf, bd);

}

void av1_fwd_txfm2d_32x8_c(const int16_t *input, int32_t *output, int stride,

                           TX_TYPE tx_type, int bd) {

  int32_t txfm_buf[32 * 8];

  TXFM_2D_FLIP_CFG cfg;

  av1_get_fwd_txfm_cfg(tx_type, TX_32X8, &cfg);

  fwd_txfm2d_c(input, output, stride, &cfg, txfm_buf, bd);

}

void av1_fwd_txfm2d_4x4_c(const int16_t *input, int32_t *output, int stride,

                          TX_TYPE tx_type, int bd) {

  int32_t txfm_buf[4 * 4];

  TXFM_2D_FLIP_CFG cfg;

  av1_get_fwd_txfm_cfg(tx_type, TX_4X4, &cfg);

  fwd_txfm2d_c(input, output, stride, &cfg, txfm_buf, bd);

}

void av1_fwd_txfm2d_8x8_c(const int16_t *input, int32_t *output, int stride,

                          TX_TYPE tx_type, int bd) {

  int32_t txfm_buf[8 * 8];

  TXFM_2D_FLIP_CFG cfg;

  av1_get_fwd_txfm_cfg(tx_type, TX_8X8, &cfg);

  fwd_txfm2d_c(input, output, stride, &cfg, txfm_buf, bd);

}

void av1_fwd_txfm2d_16x16_c(const int16_t *input, int32_t *output, int stride,

                            TX_TYPE tx_type, int bd) {

  int32_t txfm_buf[16 * 16];

  TXFM_2D_FLIP_CFG cfg;

  av1_get_fwd_txfm_cfg(tx_type, TX_16X16, &cfg);

  fwd_txfm2d_c(input, output, stride, &cfg, txfm_buf, bd);

}

void av1_fwd_txfm2d_32x32_c(const int16_t *input, int32_t *output, int stride,

                            TX_TYPE tx_type, int bd) {

  int32_t txfm_buf[32 * 32];

  TXFM_2D_FLIP_CFG cfg;

  av1_get_fwd_txfm_cfg(tx_type, TX_32X32, &cfg);

  fwd_txfm2d_c(input, output, stride, &cfg, txfm_buf, bd);

}

void av1_fwd_txfm2d_64x64_c(const int16_t *input, int32_t *output, int stride,

                            TX_TYPE tx_type, int bd) {

  int32_t txfm_buf[64 * 64];

  TXFM_2D_FLIP_CFG cfg;

  av1_get_fwd_txfm_cfg(tx_type, TX_64X64, &cfg);

  fwd_txfm2d_c(input, output, stride, &cfg, txfm_buf, bd);

  // Zero out top-right 32x32 area.

  for (int row = 0; row < 32; ++row) {

    memset(output + row * 64 + 32, 0, 32 * sizeof(*output));

  }

  // Zero out the bottom 64x32 area.

  memset(output + 32 * 64, 0, 32 * 64 * sizeof(*output));

  // Re-pack non-zero coeffs in the first 32x32 indices.

  for (int row = 1; row < 32; ++row) {

    memcpy(output + row * 32, output + row * 64, 32 * sizeof(*output));

  }

}

void av1_fwd_txfm2d_32x64_c(const int16_t *input, int32_t *output, int stride,

                            TX_TYPE tx_type, int bd) {

  DECLARE_ALIGNED(32, int32_t, txfm_buf[32 * 64]);

  TXFM_2D_FLIP_CFG cfg;

  av1_get_fwd_txfm_cfg(tx_type, TX_32X64, &cfg);

  fwd_txfm2d_c(input, output, stride, &cfg, txfm_buf, bd);

  // Zero out the bottom 32x32 area.

  memset(output + 32 * 32, 0, 32 * 32 * sizeof(*output));

  // Note: no repacking needed here.

}

void av1_fwd_txfm2d_64x32_c(const int16_t *input, int32_t *output, int stride,

                            TX_TYPE tx_type, int bd) {

  int32_t txfm_buf[64 * 32];

  TXFM_2D_FLIP_CFG cfg;

  av1_get_fwd_txfm_cfg(tx_type, TX_64X32, &cfg);

  fwd_txfm2d_c(input, output, stride, &cfg, txfm_buf, bd);

  // Zero out right 32x32 area.

  for (int row = 0; row < 32; ++row) {

    memset(output + row * 64 + 32, 0, 32 * sizeof(*output));

  }

  // Re-pack non-zero coeffs in the first 32x32 indices.

  for (int row = 1; row < 32; ++row) {

    memcpy(output + row * 32, output + row * 64, 32 * sizeof(*output));

  }

}

void av1_fwd_txfm2d_16x64_c(const int16_t *input, int32_t *output, int stride,

                            TX_TYPE tx_type, int bd) {

  DECLARE_ALIGNED(32, int32_t, txfm_buf[64 * 16]);

  TXFM_2D_FLIP_CFG cfg;

  av1_get_fwd_txfm_cfg(tx_type, TX_16X64, &cfg);

  fwd_txfm2d_c(input, output, stride, &cfg, txfm_buf, bd);

  // Zero out the bottom 16x32 area.

  memset(output + 16 * 32, 0, 16 * 32 * sizeof(*output));

  // Note: no repacking needed here.

}

void av1_fwd_txfm2d_64x16_c(const int16_t *input, int32_t *output, int stride,

                            TX_TYPE tx_type, int bd) {

  int32_t txfm_buf[64 * 16];

  TXFM_2D_FLIP_CFG cfg;

  av1_get_fwd_txfm_cfg(tx_type, TX_64X16, &cfg);

  fwd_txfm2d_c(input, output, stride, &cfg, txfm_buf, bd);

  // Zero out right 32x16 area.

  for (int row = 0; row < 16; ++row) {

    memset(output + row * 64 + 32, 0, 32 * sizeof(*output));

  }

  // Re-pack non-zero coeffs in the first 32x16 indices.

  for (int row = 1; row < 16; ++row) {

    memcpy(output + row * 32, output + row * 64, 32 * sizeof(*output));

  }

}

static const int8_t fwd_shift_4x4[3] = { 2, 0, 0 };

static const int8_t fwd_shift_8x8[3] = { 2, -1, 0 };

static const int8_t fwd_shift_16x16[3] = { 2, -2, 0 };

static const int8_t fwd_shift_32x32[3] = { 2, -4, 0 };

static const int8_t fwd_shift_64x64[3] = { 0, -2, -2 };

static const int8_t fwd_shift_4x8[3] = { 2, -1, 0 };

static const int8_t fwd_shift_8x4[3] = { 2, -1, 0 };

static const int8_t fwd_shift_8x16[3] = { 2, -2, 0 };

static const int8_t fwd_shift_16x8[3] = { 2, -2, 0 };

static const int8_t fwd_shift_16x32[3] = { 2, -4, 0 };

static const int8_t fwd_shift_32x16[3] = { 2, -4, 0 };

static const int8_t fwd_shift_32x64[3] = { 0, -2, -2 };

static const int8_t fwd_shift_64x32[3] = { 2, -4, -2 };

static const int8_t fwd_shift_4x16[3] = { 2, -1, 0 };

static const int8_t fwd_shift_16x4[3] = { 2, -1, 0 };

static const int8_t fwd_shift_8x32[3] = { 2, -2, 0 };

static const int8_t fwd_shift_32x8[3] = { 2, -2, 0 };

static const int8_t fwd_shift_16x64[3] = { 0, -2, 0 };

static const int8_t fwd_shift_64x16[3] = { 2, -4, 0 };

const int8_t *av1_fwd_txfm_shift_ls[TX_SIZES_ALL] = {

  fwd_shift_4x4,   fwd_shift_8x8,   fwd_shift_16x16, fwd_shift_32x32,

  fwd_shift_64x64, fwd_shift_4x8,   fwd_shift_8x4,   fwd_shift_8x16,

  fwd_shift_16x8,  fwd_shift_16x32, fwd_shift_32x16, fwd_shift_32x64,

  fwd_shift_64x32, fwd_shift_4x16,  fwd_shift_16x4,  fwd_shift_8x32,

  fwd_shift_32x8,  fwd_shift_16x64, fwd_shift_64x16,

};

const int8_t av1_fwd_cos_bit_col[MAX_TXWH_IDX /*txw_idx*/]

                                [MAX_TXWH_IDX /*txh_idx*/] = {

                                  { 13, 13, 13, 0, 0 },

                                  { 13, 13, 13, 12, 0 },

                                  { 13, 13, 13, 12, 13 },

                                  { 0, 13, 13, 12, 13 },

                                  { 0, 0, 13, 12, 13 }

                                };

const int8_t av1_fwd_cos_bit_row[MAX_TXWH_IDX /*txw_idx*/]

                                [MAX_TXWH_IDX /*txh_idx*/] = {

                                  { 13, 13, 12, 0, 0 },

                                  { 13, 13, 13, 12, 0 },

                                  { 13, 13, 12, 13, 12 },

                                  { 0, 12, 13, 12, 11 },

                                  { 0, 0, 12, 11, 10 }

                                };

static const int8_t fdct4_range_mult2[4] = { 0, 2, 3, 3 };

static const int8_t fdct8_range_mult2[6] = { 0, 2, 4, 5, 5, 5 };

static const int8_t fdct16_range_mult2[8] = { 0, 2, 4, 6, 7, 7, 7, 7 };

static const int8_t fdct32_range_mult2[10] = { 0, 2, 4, 6, 8, 9, 9, 9, 9, 9 };

static const int8_t fdct64_range_mult2[12] = { 0,  2,  4,  6,  8,  10,

                                               11, 11, 11, 11, 11, 11 };

static const int8_t fadst4_range_mult2[7] = { 0, 2, 4, 3, 3, 3, 3 };

static const int8_t fadst8_range_mult2[8] = { 0, 0, 1, 3, 3, 5, 5, 5 };

static const int8_t fadst16_range_mult2[10] = { 0, 0, 1, 3, 3, 5, 5, 7, 7, 7 };

static const int8_t fidtx4_range_mult2[1] = { 1 };

static const int8_t fidtx8_range_mult2[1] = { 2 };

static const int8_t fidtx16_range_mult2[1] = { 3 };

static const int8_t fidtx32_range_mult2[1] = { 4 };

#if 0

const int8_t fwd_idtx_range_row[MAX_TXWH_IDX /*txw_idx*/]

                               [MAX_TXWH_IDX /*txh_idx*/] = { { 2, 4, 5, 0, 0 },

                                                              { 3, 4, 5, 6, 0 },

                                                              { 4, 5, 6, 7, 8 },

                                                              { 0, 5, 6, 7, 8 },

                                                              { 0, 0, 7, 8,

                                                                9 } };

#endif

static const int8_t *fwd_txfm_range_mult2_list[TXFM_TYPES] = {

  fdct4_range_mult2,  fdct8_range_mult2,   fdct16_range_mult2,

  fdct32_range_mult2, fdct64_range_mult2,  fadst4_range_mult2,

  fadst8_range_mult2, fadst16_range_mult2, fidtx4_range_mult2,

  fidtx8_range_mult2, fidtx16_range_mult2, fidtx32_range_mult2

};

static INLINE void set_fwd_txfm_non_scale_range(TXFM_2D_FLIP_CFG *cfg) {

  av1_zero(cfg->stage_range_col);

  av1_zero(cfg->stage_range_row);

  const int8_t *range_mult2_col = fwd_txfm_range_mult2_list[cfg->txfm_type_col];

  if (cfg->txfm_type_col != TXFM_TYPE_INVALID) {

    int stage_num_col = cfg->stage_num_col;

    for (int i = 0; i < stage_num_col; ++i)

      cfg->stage_range_col[i] = (range_mult2_col[i] + 1) >> 1;

  }

  if (cfg->txfm_type_row != TXFM_TYPE_INVALID) {

    int stage_num_row = cfg->stage_num_row;

    const int8_t *range_mult2_row =

        fwd_txfm_range_mult2_list[cfg->txfm_type_row];

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

      cfg->stage_range_row[i] =

          (range_mult2_col[cfg->stage_num_col - 1] + range_mult2_row[i] + 1) >>

          1;

    }

  }

}

void av1_get_fwd_txfm_cfg(TX_TYPE tx_type, TX_SIZE tx_size,

                          TXFM_2D_FLIP_CFG *cfg) {

  assert(cfg != NULL);

  cfg->tx_size = tx_size;

  set_flip_cfg(tx_type, cfg);

  const TX_TYPE_1D tx_type_1d_col = vtx_tab[tx_type];

  const TX_TYPE_1D tx_type_1d_row = htx_tab[tx_type];

  const int txw_idx = get_txw_idx(tx_size);

  const int txh_idx = get_txh_idx(tx_size);

  cfg->shift = av1_fwd_txfm_shift_ls[tx_size];

  cfg->cos_bit_col = av1_fwd_cos_bit_col[txw_idx][txh_idx];

  cfg->cos_bit_row = av1_fwd_cos_bit_row[txw_idx][txh_idx];

  cfg->txfm_type_col = av1_txfm_type_ls[txh_idx][tx_type_1d_col];

  cfg->txfm_type_row = av1_txfm_type_ls[txw_idx][tx_type_1d_row];

  cfg->stage_num_col = av1_txfm_stage_num_list[cfg->txfm_type_col];

  cfg->stage_num_row = av1_txfm_stage_num_list[cfg->txfm_type_row];

  set_fwd_txfm_non_scale_range(cfg);

}