/*
 *  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 "./vpx_config.h"
#include "vp9_rtcd.h"
#include "vp9/encoder/vp9_quantize.h"
#include "vp9/common/vp9_reconintra.h"
#include "vp9/encoder/vp9_encodemb.h"
#include "vp9/common/vp9_invtrans.h"
#include "vp9/encoder/vp9_encodeintra.h"

static void encode_intra4x4block(MACROBLOCK *x, int ib);

int vp9_encode_intra(VP9_COMP *cpi, MACROBLOCK *x, int use_16x16_pred) {
  MB_MODE_INFO * mbmi = &x->e_mbd.mode_info_context->mbmi;
  (void) cpi;

  if (use_16x16_pred) {
    mbmi->mode = DC_PRED;
    mbmi->uv_mode = DC_PRED;
    mbmi->ref_frame = INTRA_FRAME;

    vp9_encode_intra16x16mby(&cpi->common, x);
  } else {
    int i;

    for (i = 0; i < 16; i++) {
      x->e_mbd.block[i].bmi.as_mode.first = B_DC_PRED;
      encode_intra4x4block(x, i);
    }
  }

  return vp9_get_mb_ss(x->src_diff);
}

static void encode_intra4x4block(MACROBLOCK *x, int ib) {
  BLOCKD *b = &x->e_mbd.block[ib];
  BLOCK *be = &x->block[ib];
  MACROBLOCKD * const xd = &x->e_mbd;
  TX_TYPE tx_type;

  assert(ib < 16);

#if CONFIG_NEWBINTRAMODES
  b->bmi.as_mode.context = vp9_find_bpred_context(&x->e_mbd, b);
#endif

  vp9_intra4x4_predict(&x->e_mbd, b, b->bmi.as_mode.first, b->predictor, 16);
  vp9_subtract_b(be, b, 16);

  tx_type = get_tx_type_4x4(&x->e_mbd, ib);
  if (tx_type != DCT_DCT) {
    vp9_short_fht4x4(be->src_diff, be->coeff, 16, tx_type);
    vp9_ht_quantize_b_4x4(x, ib, tx_type);
    vp9_short_iht4x4(BLOCK_OFFSET(xd->plane[0].dqcoeff, ib, 16),
                     b->diff, 16, tx_type);
  } else {
    x->fwd_txm4x4(be->src_diff, be->coeff, 32);
    x->quantize_b_4x4(x, ib, 16);
    vp9_inverse_transform_b_4x4(&x->e_mbd, xd->plane[0].eobs[ib],
                                BLOCK_OFFSET(xd->plane[0].dqcoeff, ib, 16),
                                b->diff, 32);
  }

  vp9_recon_b(b->predictor, b->diff, *(b->base_dst) + b->dst, b->dst_stride);
}

void vp9_encode_intra4x4mby(MACROBLOCK *mb) {
  int i;

  for (i = 0; i < 16; i++)
    encode_intra4x4block(mb, i);
}

void vp9_encode_intra16x16mby(VP9_COMMON *const cm, MACROBLOCK *x) {
  MACROBLOCKD *xd = &x->e_mbd;
  BLOCK *b = &x->block[0];
  TX_SIZE tx_size = xd->mode_info_context->mbmi.txfm_size;

  vp9_build_intra_predictors_mby(xd);

  vp9_subtract_mby(x->src_diff, *(b->base_src), xd->predictor, b->src_stride);

  switch (tx_size) {
    case TX_16X16:
      vp9_transform_sby_16x16(x, BLOCK_SIZE_MB16X16);
      vp9_quantize_sby_16x16(x, BLOCK_SIZE_MB16X16);
      if (x->optimize)
        vp9_optimize_sby_16x16(cm, x, BLOCK_SIZE_MB16X16);
      vp9_inverse_transform_sby_16x16(xd, BLOCK_SIZE_MB16X16);
      break;
    case TX_8X8:
      vp9_transform_sby_8x8(x, BLOCK_SIZE_MB16X16);
      vp9_quantize_sby_8x8(x, BLOCK_SIZE_MB16X16);
      if (x->optimize)
        vp9_optimize_sby_8x8(cm, x, BLOCK_SIZE_MB16X16);
      vp9_inverse_transform_sby_8x8(xd, BLOCK_SIZE_MB16X16);
      break;
    default:
      vp9_transform_sby_4x4(x, BLOCK_SIZE_MB16X16);
      vp9_quantize_sby_4x4(x, BLOCK_SIZE_MB16X16);
      if (x->optimize)
        vp9_optimize_sby_4x4(cm, x, BLOCK_SIZE_MB16X16);
      vp9_inverse_transform_sby_4x4(xd, BLOCK_SIZE_MB16X16);
      break;
  }

  vp9_recon_mby(xd);
}

void vp9_encode_intra16x16mbuv(VP9_COMMON *const cm, MACROBLOCK *x) {
  MACROBLOCKD *xd = &x->e_mbd;
  TX_SIZE tx_size = xd->mode_info_context->mbmi.txfm_size;

  vp9_build_intra_predictors_mbuv(xd);

  vp9_subtract_mbuv(x->src_diff, x->src.u_buffer, x->src.v_buffer,
                    xd->predictor, x->src.uv_stride);

  switch (tx_size) {
    case TX_4X4:
      vp9_transform_sbuv_4x4(x, BLOCK_SIZE_MB16X16);
      vp9_quantize_sbuv_4x4(x, BLOCK_SIZE_MB16X16);
      if (x->optimize)
        vp9_optimize_sbuv_4x4(cm, x, BLOCK_SIZE_MB16X16);
      vp9_inverse_transform_sbuv_4x4(xd, BLOCK_SIZE_MB16X16);
      break;
    default:  // 16x16 or 8x8
      vp9_transform_sbuv_8x8(x, BLOCK_SIZE_MB16X16);
      vp9_quantize_sbuv_8x8(x, BLOCK_SIZE_MB16X16);
      if (x->optimize)
        vp9_optimize_sbuv_8x8(cm, x, BLOCK_SIZE_MB16X16);
      vp9_inverse_transform_sbuv_8x8(xd, BLOCK_SIZE_MB16X16);
      break;
    }

  vp9_recon_intra_mbuv(xd);
}

void vp9_encode_intra8x8(MACROBLOCK *x, int ib) {
  MACROBLOCKD *xd = &x->e_mbd;
  BLOCKD *b = &xd->block[ib];
  BLOCK *be = &x->block[ib];
  const int iblock[4] = {0, 1, 4, 5};
  int i;
  TX_TYPE tx_type;

  vp9_intra8x8_predict(xd, b, b->bmi.as_mode.first, b->predictor, 16);
  // generate residual blocks
  vp9_subtract_4b_c(be, b, 16);

  if (xd->mode_info_context->mbmi.txfm_size == TX_8X8) {
    int idx = (ib & 0x02) ? (ib + 2) : ib;
    int16_t * const dqcoeff = BLOCK_OFFSET(xd->plane[0].dqcoeff, idx, 16);

    assert(idx < 16);
    tx_type = get_tx_type_8x8(xd, ib);
    if (tx_type != DCT_DCT) {
      vp9_short_fht8x8(be->src_diff, (x->block + idx)->coeff, 16, tx_type);
      x->quantize_b_8x8(x, idx, tx_type, 16);
      vp9_short_iht8x8(dqcoeff, xd->block[ib].diff,
                            16, tx_type);
    } else {
      x->fwd_txm8x8(be->src_diff, (x->block + idx)->coeff, 32);
      x->quantize_b_8x8(x, idx, DCT_DCT, 16);
      vp9_short_idct8x8(dqcoeff, xd->block[ib].diff, 32);
    }
  } else {
    for (i = 0; i < 4; i++) {
      int idx = ib + iblock[i];
      int16_t * const dqcoeff = BLOCK_OFFSET(xd->plane[0].dqcoeff, idx, 16);

      assert(idx < 16);
      b = &xd->block[ib + iblock[i]];
      be = &x->block[ib + iblock[i]];
      tx_type = get_tx_type_4x4(xd, ib + iblock[i]);
      if (tx_type != DCT_DCT) {
        vp9_short_fht4x4(be->src_diff, be->coeff, 16, tx_type);
        vp9_ht_quantize_b_4x4(x, ib + iblock[i], tx_type);
        vp9_short_iht4x4(dqcoeff, b->diff, 16, tx_type);
      } else if (!(i & 1) &&
                 get_tx_type_4x4(xd, ib + iblock[i] + 1) == DCT_DCT) {
        x->fwd_txm8x4(be->src_diff, be->coeff, 32);
        x->quantize_b_4x4_pair(x, ib + iblock[i], ib + iblock[i] + 1, 16);
        vp9_inverse_transform_b_4x4(xd, xd->plane[0].eobs[ib + iblock[i]],
                                    dqcoeff, b->diff, 32);
        vp9_inverse_transform_b_4x4(xd, xd->plane[0].eobs[ib + iblock[i] + 1],
                                    dqcoeff + 16, (b + 1)->diff, 32);
        i++;
      } else {
        x->fwd_txm4x4(be->src_diff, be->coeff, 32);
        x->quantize_b_4x4(x, ib + iblock[i], 16);
        vp9_inverse_transform_b_4x4(xd, xd->plane[0].eobs[ib + iblock[i]],
                                    dqcoeff, b->diff, 32);
      }
    }
  }

  // reconstruct submacroblock
  for (i = 0; i < 4; i++) {
    b = &xd->block[ib + iblock[i]];
    vp9_recon_b_c(b->predictor, b->diff, *(b->base_dst) + b->dst,
                  b->dst_stride);
  }
}

void vp9_encode_intra8x8mby(MACROBLOCK *x) {
  int i;

  for (i = 0; i < 4; i++)
    vp9_encode_intra8x8(x, vp9_i8x8_block[i]);
}

static void encode_intra_uv4x4(MACROBLOCK *x, int ib, int mode) {
  MACROBLOCKD * const xd = &x->e_mbd;
  BLOCKD *b = &x->e_mbd.block[ib];
  BLOCK *be = &x->block[ib];
  int16_t * const dqcoeff = MB_SUBBLOCK_FIELD(xd, dqcoeff, ib);
  const int plane = ib < 20 ? 1 : 2;
  const int block = ib < 20 ? ib - 16 : ib - 20;

  assert(ib >= 16 && ib < 24);
  vp9_intra_uv4x4_predict(&x->e_mbd, b, mode, b->predictor, 8);

  vp9_subtract_b(be, b, 8);

  x->fwd_txm4x4(be->src_diff, be->coeff, 16);
  x->quantize_b_4x4(x, ib, 16);
  vp9_inverse_transform_b_4x4(&x->e_mbd, xd->plane[plane].eobs[block],
                              dqcoeff, b->diff, 16);

  vp9_recon_uv_b_c(b->predictor, b->diff, *(b->base_dst) + b->dst,
                   b->dst_stride);
}

void vp9_encode_intra8x8mbuv(MACROBLOCK *x) {
  int i;

  for (i = 0; i < 4; i++) {
    BLOCKD *b = &x->e_mbd.block[vp9_i8x8_block[i]];
    int mode = b->bmi.as_mode.first;

    encode_intra_uv4x4(x, i + 16, mode);  // u
    encode_intra_uv4x4(x, i + 20, mode);  // v
  }
}