/*
 *  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 "./vpx_dsp_rtcd.h"
#include "./vp8_rtcd.h"
#include "vpx_mem/vpx_mem.h"
#include "vpx_ports/vpx_once.h"
#include "blockd.h"
#include "vp8/common/reconintra.h"
#include "vp8/common/reconintra4x4.h"

enum {
  SIZE_16,
  SIZE_8,
  NUM_SIZES,
};

typedef void (*intra_pred_fn)(uint8_t *dst, ptrdiff_t stride,
                              const uint8_t *above, const uint8_t *left);

static intra_pred_fn pred[4][NUM_SIZES];
static intra_pred_fn dc_pred[2][2][NUM_SIZES];

static void vp8_init_intra_predictors_internal(void) {
#define INIT_SIZE(sz)                                           \
  pred[V_PRED][SIZE_##sz] = vpx_v_predictor_##sz##x##sz;        \
  pred[H_PRED][SIZE_##sz] = vpx_h_predictor_##sz##x##sz;        \
  pred[TM_PRED][SIZE_##sz] = vpx_tm_predictor_##sz##x##sz;      \
                                                                \
  dc_pred[0][0][SIZE_##sz] = vpx_dc_128_predictor_##sz##x##sz;  \
  dc_pred[0][1][SIZE_##sz] = vpx_dc_top_predictor_##sz##x##sz;  \
  dc_pred[1][0][SIZE_##sz] = vpx_dc_left_predictor_##sz##x##sz; \
  dc_pred[1][1][SIZE_##sz] = vpx_dc_predictor_##sz##x##sz

  INIT_SIZE(16);
  INIT_SIZE(8);
  vp8_init_intra4x4_predictors_internal();
}

void vp8_build_intra_predictors_mby_s(MACROBLOCKD *x, unsigned char *yabove_row,
                                      unsigned char *yleft, int left_stride,
                                      unsigned char *ypred_ptr, int y_stride) {
  MB_PREDICTION_MODE mode = x->mode_info_context->mbmi.mode;
  DECLARE_ALIGNED(16, uint8_t, yleft_col[16]);
  int i;
  intra_pred_fn fn;

  for (i = 0; i < 16; ++i) {
    yleft_col[i] = yleft[i * left_stride];
  }

  if (mode == DC_PRED) {
    fn = dc_pred[x->left_available][x->up_available][SIZE_16];
  } else {
    fn = pred[mode][SIZE_16];
  }

  fn(ypred_ptr, y_stride, yabove_row, yleft_col);
}

void vp8_build_intra_predictors_mbuv_s(
    MACROBLOCKD *x, unsigned char *uabove_row, unsigned char *vabove_row,
    unsigned char *uleft, unsigned char *vleft, int left_stride,
    unsigned char *upred_ptr, unsigned char *vpred_ptr, int pred_stride) {
  MB_PREDICTION_MODE uvmode = x->mode_info_context->mbmi.uv_mode;
#if HAVE_VSX
  /* Power PC implementation uses "vec_vsx_ld" to read 16 bytes from
     uleft_col and vleft_col. Play it safe by reserving enough stack
     space here. */
  unsigned char uleft_col[16];
  unsigned char vleft_col[16];
#else
  unsigned char uleft_col[8];
  unsigned char vleft_col[8];
#endif
  int i;
  intra_pred_fn fn;

  for (i = 0; i < 8; ++i) {
    uleft_col[i] = uleft[i * left_stride];
    vleft_col[i] = vleft[i * left_stride];
  }

  if (uvmode == DC_PRED) {
    fn = dc_pred[x->left_available][x->up_available][SIZE_8];
  } else {
    fn = pred[uvmode][SIZE_8];
  }

  fn(upred_ptr, pred_stride, uabove_row, uleft_col);
  fn(vpred_ptr, pred_stride, vabove_row, vleft_col);
}

void vp8_init_intra_predictors(void) {
  once(vp8_init_intra_predictors_internal);
}