convolve.c 68 KB
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/*
 * 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.
 */

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#include <assert.h>
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#include <string.h>
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#include "./aom_dsp_rtcd.h"
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#include "./av1_rtcd.h"
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#include "av1/common/blockd.h"
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#include "av1/common/convolve.h"
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#include "av1/common/filter.h"
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#include "av1/common/onyxc_int.h"
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#include "aom_dsp/aom_dsp_common.h"
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#include "aom_ports/mem.h"
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#define MAX_BLOCK_WIDTH (MAX_SB_SIZE)
#define MAX_BLOCK_HEIGHT (MAX_SB_SIZE)
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#define MAX_STEP (32)

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void av1_convolve_horiz_c(const uint8_t *src, int src_stride, uint8_t *dst,
                          int dst_stride, int w, int h,
                          const InterpFilterParams filter_params,
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                          const int subpel_x_q4, int x_step_q4,
                          ConvolveParams *conv_params) {
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  int x, y;
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  int filter_size = filter_params.taps;
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  assert(conv_params->round == CONVOLVE_OPT_ROUND);
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  src -= filter_size / 2 - 1;
  for (y = 0; y < h; ++y) {
    int x_q4 = subpel_x_q4;
    for (x = 0; x < w; ++x) {
      const uint8_t *const src_x = &src[x_q4 >> SUBPEL_BITS];
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      const int16_t *x_filter = av1_get_interp_filter_subpel_kernel(
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          filter_params, x_q4 & SUBPEL_MASK);
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      int k, sum = 0;
      for (k = 0; k < filter_size; ++k) sum += src_x[k] * x_filter[k];
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      sum = clip_pixel(ROUND_POWER_OF_TWO(sum, FILTER_BITS));
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      if (conv_params->do_average)
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        dst[x] = ROUND_POWER_OF_TWO(dst[x] + sum, 1);
      else
        dst[x] = sum;
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      x_q4 += x_step_q4;
    }
    src += src_stride;
    dst += dst_stride;
  }
}

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void av1_convolve_horiz_scale(const uint8_t *src, int src_stride, uint8_t *dst,
                              int dst_stride, int w, int h,
                              const InterpFilterParams filter_params,
                              const int subpel_x_qn, int x_step_qn,
                              ConvolveParams *conv_params) {
  int x, y;
  int filter_size = filter_params.taps;
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  assert(conv_params->round == CONVOLVE_OPT_ROUND);
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  src -= filter_size / 2 - 1;
  for (y = 0; y < h; ++y) {
    int x_qn = subpel_x_qn;
    for (x = 0; x < w; ++x) {
      const uint8_t *const src_x = &src[x_qn >> SCALE_SUBPEL_BITS];
      const int x_filter_idx = (x_qn & SCALE_SUBPEL_MASK) >> SCALE_EXTRA_BITS;
      assert(x_filter_idx < SUBPEL_SHIFTS);
      const int16_t *x_filter =
          av1_get_interp_filter_subpel_kernel(filter_params, x_filter_idx);
      int k, sum = 0;
      for (k = 0; k < filter_size; ++k) sum += src_x[k] * x_filter[k];

      sum = clip_pixel(ROUND_POWER_OF_TWO(sum, FILTER_BITS));
      if (conv_params->do_average)
        dst[x] = ROUND_POWER_OF_TWO(dst[x] + sum, 1);
      else
        dst[x] = sum;

      x_qn += x_step_qn;
    }
    src += src_stride;
    dst += dst_stride;
  }
}

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void av1_convolve_vert_c(const uint8_t *src, int src_stride, uint8_t *dst,
                         int dst_stride, int w, int h,
                         const InterpFilterParams filter_params,
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                         const int subpel_y_q4, int y_step_q4,
                         ConvolveParams *conv_params) {
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  int x, y;
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  int filter_size = filter_params.taps;
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  assert(conv_params->round == CONVOLVE_OPT_ROUND);
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  src -= src_stride * (filter_size / 2 - 1);
  for (x = 0; x < w; ++x) {
    int y_q4 = subpel_y_q4;
    for (y = 0; y < h; ++y) {
      const uint8_t *const src_y = &src[(y_q4 >> SUBPEL_BITS) * src_stride];
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      const int16_t *y_filter = av1_get_interp_filter_subpel_kernel(
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          filter_params, y_q4 & SUBPEL_MASK);
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      int k, sum = 0;
      for (k = 0; k < filter_size; ++k)
        sum += src_y[k * src_stride] * y_filter[k];
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      sum = clip_pixel(ROUND_POWER_OF_TWO(sum, FILTER_BITS));
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      if (conv_params->do_average)
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        dst[y * dst_stride] = ROUND_POWER_OF_TWO(dst[y * dst_stride] + sum, 1);
      else
        dst[y * dst_stride] = sum;
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      y_q4 += y_step_q4;
    }
    ++src;
    ++dst;
  }
}

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void av1_convolve_vert_scale(const uint8_t *src, int src_stride, uint8_t *dst,
                             int dst_stride, int w, int h,
                             const InterpFilterParams filter_params,
                             const int subpel_y_qn, int y_step_qn,
                             ConvolveParams *conv_params) {
  int x, y;
  int filter_size = filter_params.taps;
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  assert(conv_params->round == CONVOLVE_OPT_ROUND);
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  src -= src_stride * (filter_size / 2 - 1);
  for (x = 0; x < w; ++x) {
    int y_qn = subpel_y_qn;
    for (y = 0; y < h; ++y) {
      const uint8_t *const src_y =
          &src[(y_qn >> SCALE_SUBPEL_BITS) * src_stride];
      const int y_filter_idx = (y_qn & SCALE_SUBPEL_MASK) >> SCALE_EXTRA_BITS;
      assert(y_filter_idx < SUBPEL_SHIFTS);
      const int16_t *y_filter =
          av1_get_interp_filter_subpel_kernel(filter_params, y_filter_idx);
      int k, sum = 0;
      for (k = 0; k < filter_size; ++k)
        sum += src_y[k * src_stride] * y_filter[k];

      sum = clip_pixel(ROUND_POWER_OF_TWO(sum, FILTER_BITS));
      if (conv_params->do_average)
        dst[y * dst_stride] = ROUND_POWER_OF_TWO(dst[y * dst_stride] + sum, 1);
      else
        dst[y * dst_stride] = sum;

      y_qn += y_step_qn;
    }
    ++src;
    ++dst;
  }
}

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static void convolve_copy(const uint8_t *src, int src_stride, uint8_t *dst,
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                          int dst_stride, int w, int h,
                          ConvolveParams *conv_params) {
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  assert(conv_params->round == CONVOLVE_OPT_ROUND);
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  if (conv_params->do_average == 0) {
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    int r;
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    for (r = 0; r < h; ++r) {
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      memcpy(dst, src, w);
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      src += src_stride;
      dst += dst_stride;
    }
  } else {
    int r, c;
    for (r = 0; r < h; ++r) {
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      for (c = 0; c < w; ++c) {
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        dst[c] = clip_pixel(ROUND_POWER_OF_TWO(dst[c] + src[c], 1));
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      }
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      src += src_stride;
      dst += dst_stride;
    }
  }
}

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void av1_convolve_horiz_facade(const uint8_t *src, int src_stride, uint8_t *dst,
                               int dst_stride, int w, int h,
                               const InterpFilterParams filter_params,
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                               const int subpel_x_q4, int x_step_q4,
                               ConvolveParams *conv_params) {
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  assert(conv_params->round == CONVOLVE_OPT_ROUND);
  if (filter_params.taps == SUBPEL_TAPS) {
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    const int16_t *filter_x =
        av1_get_interp_filter_subpel_kernel(filter_params, subpel_x_q4);
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    if (conv_params->do_average == 0)
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      aom_convolve8_horiz(src, src_stride, dst, dst_stride, filter_x, x_step_q4,
                          NULL, -1, w, h);
    else
      aom_convolve8_avg_horiz(src, src_stride, dst, dst_stride, filter_x,
                              x_step_q4, NULL, -1, w, h);
  } else {
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    av1_convolve_horiz(src, src_stride, dst, dst_stride, w, h, filter_params,
                       subpel_x_q4, x_step_q4, conv_params);
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  }
}

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void av1_convolve_horiz_facade_c(const uint8_t *src, int src_stride,
                                 uint8_t *dst, int dst_stride, int w, int h,
                                 const InterpFilterParams filter_params,
                                 const int subpel_x_q4, int x_step_q4,
                                 ConvolveParams *conv_params) {
  assert(conv_params->round == CONVOLVE_OPT_ROUND);
  if (filter_params.taps == SUBPEL_TAPS) {
    const int16_t *filter_x =
        av1_get_interp_filter_subpel_kernel(filter_params, subpel_x_q4);
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    if (conv_params->do_average == 0)
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      aom_convolve8_horiz_c(src, src_stride, dst, dst_stride, filter_x,
                            x_step_q4, NULL, -1, w, h);
    else
      aom_convolve8_avg_horiz_c(src, src_stride, dst, dst_stride, filter_x,
                                x_step_q4, NULL, -1, w, h);
  } else {
    av1_convolve_horiz_c(src, src_stride, dst, dst_stride, w, h, filter_params,
                         subpel_x_q4, x_step_q4, conv_params);
  }
}

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void av1_convolve_horiz_facade_scale(const uint8_t *src, int src_stride,
                                     uint8_t *dst, int dst_stride, int w, int h,
                                     const InterpFilterParams filter_params,
                                     const int subpel_x_qn, int x_step_qn,
                                     ConvolveParams *conv_params) {
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  assert(conv_params->round == CONVOLVE_OPT_ROUND);
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  if (filter_params.taps == SUBPEL_TAPS) {
    const int16_t *filter_x = av1_get_interp_filter_subpel_kernel(
        filter_params, subpel_x_qn >> SCALE_EXTRA_BITS);
    if (conv_params->do_average == 0)
      aom_convolve8_horiz_scale(src, src_stride, dst, dst_stride, filter_x,
                                subpel_x_qn, x_step_qn, NULL, 0, -1, w, h);
    else
      aom_convolve8_avg_horiz_scale(src, src_stride, dst, dst_stride, filter_x,
                                    subpel_x_qn, x_step_qn, NULL, 0, -1, w, h);
  } else {
    av1_convolve_horiz_scale(src, src_stride, dst, dst_stride, w, h,
                             filter_params, subpel_x_qn, x_step_qn,
                             conv_params);
  }
}

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void av1_convolve_vert_facade(const uint8_t *src, int src_stride, uint8_t *dst,
                              int dst_stride, int w, int h,
                              const InterpFilterParams filter_params,
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                              const int subpel_y_q4, int y_step_q4,
                              ConvolveParams *conv_params) {
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  assert(conv_params->round == CONVOLVE_OPT_ROUND);
  if (filter_params.taps == SUBPEL_TAPS) {
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    const int16_t *filter_y =
        av1_get_interp_filter_subpel_kernel(filter_params, subpel_y_q4);
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    if (conv_params->do_average == 0) {
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      aom_convolve8_vert(src, src_stride, dst, dst_stride, NULL, -1, filter_y,
                         y_step_q4, w, h);
    } else {
      aom_convolve8_avg_vert(src, src_stride, dst, dst_stride, NULL, -1,
                             filter_y, y_step_q4, w, h);
    }
  } else {
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    av1_convolve_vert(src, src_stride, dst, dst_stride, w, h, filter_params,
                      subpel_y_q4, y_step_q4, conv_params);
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  }
}

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void av1_convolve_vert_facade_c(const uint8_t *src, int src_stride,
                                uint8_t *dst, int dst_stride, int w, int h,
                                const InterpFilterParams filter_params,
                                const int subpel_y_q4, int y_step_q4,
                                ConvolveParams *conv_params) {
  assert(conv_params->round == CONVOLVE_OPT_ROUND);
  if (filter_params.taps == SUBPEL_TAPS) {
    const int16_t *filter_y =
        av1_get_interp_filter_subpel_kernel(filter_params, subpel_y_q4);
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    if (conv_params->do_average == 0) {
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      aom_convolve8_vert_c(src, src_stride, dst, dst_stride, NULL, -1, filter_y,
                           y_step_q4, w, h);
    } else {
      aom_convolve8_avg_vert_c(src, src_stride, dst, dst_stride, NULL, -1,
                               filter_y, y_step_q4, w, h);
    }
  } else {
    av1_convolve_vert_c(src, src_stride, dst, dst_stride, w, h, filter_params,
                        subpel_y_q4, y_step_q4, conv_params);
  }
}

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void av1_convolve_vert_facade_scale(const uint8_t *src, int src_stride,
                                    uint8_t *dst, int dst_stride, int w, int h,
                                    const InterpFilterParams filter_params,
                                    const int subpel_y_qn, int y_step_qn,
                                    ConvolveParams *conv_params) {
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  assert(conv_params->round == CONVOLVE_OPT_ROUND);
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  if (filter_params.taps == SUBPEL_TAPS) {
    const int16_t *filter_y = av1_get_interp_filter_subpel_kernel(
        filter_params, subpel_y_qn >> SCALE_EXTRA_BITS);
    if (conv_params->do_average == 0) {
      aom_convolve8_vert_scale(src, src_stride, dst, dst_stride, NULL, 0, -1,
                               filter_y, subpel_y_qn, y_step_qn, w, h);
    } else {
      aom_convolve8_avg_vert_scale(src, src_stride, dst, dst_stride, NULL, 0,
                                   -1, filter_y, subpel_y_qn, y_step_qn, w, h);
    }
  } else {
    av1_convolve_vert_scale(src, src_stride, dst, dst_stride, w, h,
                            filter_params, subpel_y_qn, y_step_qn, conv_params);
  }
}

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#if CONFIG_CONVOLVE_ROUND
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void av1_convolve_rounding_c(const int32_t *src, int src_stride, uint8_t *dst,
                             int dst_stride, int w, int h, int bits) {
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  int r, c;
  for (r = 0; r < h; ++r) {
    for (c = 0; c < w; ++c) {
      dst[r * dst_stride + c] =
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          clip_pixel(ROUND_POWER_OF_TWO(src[r * src_stride + c], bits));
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    }
  }
}
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#if CONFIG_COMPOUND_ROUND
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void av1_convolve_2d_c(const uint8_t *src, int src_stride, CONV_BUF_TYPE *dst,
                       int dst_stride, int w, int h,
                       InterpFilterParams *filter_params_x,
                       InterpFilterParams *filter_params_y,
                       const int subpel_x_q4, const int subpel_y_q4,
                       ConvolveParams *conv_params) {
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  int x, y, k;
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  uint8_t im_block[(MAX_SB_SIZE + MAX_FILTER_TAP - 1) * MAX_SB_SIZE];
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  int im_h = h + filter_params_y->taps - 1;
  int im_stride = w;
  const int fo_vert = filter_params_y->taps / 2 - 1;
  const int fo_horiz = filter_params_x->taps / 2 - 1;
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  // horizontal filter
  const uint8_t *src_horiz = src - fo_vert * src_stride;
  const int16_t *x_filter = av1_get_interp_filter_subpel_kernel(
      *filter_params_x, subpel_x_q4 & SUBPEL_MASK);
  for (y = 0; y < im_h; ++y) {
    for (x = 0; x < w; ++x) {
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      int32_t sum = 0;
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      for (k = 0; k < filter_params_x->taps; ++k) {
        sum += x_filter[k] * src_horiz[y * src_stride + x - fo_horiz + k];
      }
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      im_block[y * im_stride + x] =
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          clip_pixel(ROUND_POWER_OF_TWO(sum, conv_params->round_0));
    }
  }

  // vertical filter
  uint8_t *src_vert = im_block + fo_vert * im_stride;
  const int16_t *y_filter = av1_get_interp_filter_subpel_kernel(
      *filter_params_y, subpel_y_q4 & SUBPEL_MASK);
  for (y = 0; y < h; ++y) {
    for (x = 0; x < w; ++x) {
      CONV_BUF_TYPE sum = 0;
      for (k = 0; k < filter_params_y->taps; ++k) {
        sum += y_filter[k] * src_vert[(y - fo_vert + k) * im_stride + x];
      }
      CONV_BUF_TYPE res = ROUND_POWER_OF_TWO(sum, conv_params->round_1);
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#if CONFIG_JNT_COMP
      if (conv_params->bck_offset == -1) {
        if (conv_params->do_average)
          dst[y * dst_stride + x] += res;
        else
          dst[y * dst_stride + x] = res;
      } else {
        if (conv_params->do_average == 0) {
          dst[y * dst_stride + x] = res * conv_params->fwd_offset;
        } else {
          dst[y * dst_stride + x] += res * conv_params->bck_offset;

          dst[y * dst_stride + x] >>= (DIST_PRECISION_BITS - 1);
        }
      }
#else
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      if (conv_params->do_average)
        dst[y * dst_stride + x] += res;
      else
        dst[y * dst_stride + x] = res;
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#endif  // CONFIG_JNT_COMP
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    }
  }
}
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void av1_convolve_2d_scale_c(const uint8_t *src, int src_stride,
                             CONV_BUF_TYPE *dst, int dst_stride, int w, int h,
                             InterpFilterParams *filter_params_x,
                             InterpFilterParams *filter_params_y,
                             const int subpel_x_qn, const int x_step_qn,
                             const int subpel_y_qn, const int y_step_qn,
                             ConvolveParams *conv_params) {
  int x, y, k;
  uint8_t im_block[(2 * MAX_SB_SIZE + MAX_FILTER_TAP) * MAX_SB_SIZE];
  int im_h = (((h - 1) * y_step_qn + subpel_y_qn) >> SCALE_SUBPEL_BITS) +
             filter_params_y->taps;
  int im_stride = w;
  const int fo_vert = filter_params_y->taps / 2 - 1;
  const int fo_horiz = filter_params_x->taps / 2 - 1;

  // horizontal filter
  const uint8_t *src_horiz = src - fo_vert * src_stride;
  for (y = 0; y < im_h; ++y) {
    int x_qn = subpel_x_qn;
    for (x = 0; x < w; ++x, x_qn += x_step_qn) {
      const uint8_t *const src_x = &src_horiz[(x_qn >> SCALE_SUBPEL_BITS)];
      const int x_filter_idx = (x_qn & SCALE_SUBPEL_MASK) >> SCALE_EXTRA_BITS;
      assert(x_filter_idx < SUBPEL_SHIFTS);
      const int16_t *x_filter =
          av1_get_interp_filter_subpel_kernel(*filter_params_x, x_filter_idx);
      int sum = 0;
      for (k = 0; k < filter_params_x->taps; ++k)
        sum += x_filter[k] * src_x[k - fo_horiz];
      im_block[y * im_stride + x] =
          clip_pixel(ROUND_POWER_OF_TWO(sum, conv_params->round_0));
    }
    src_horiz += src_stride;
  }

  // vertical filter
  const uint8_t *src_vert = im_block + fo_vert * im_stride;
  for (x = 0; x < w; ++x) {
    int y_qn = subpel_y_qn;
    for (y = 0; y < h; ++y, y_qn += y_step_qn) {
      const uint8_t *const src_y =
          &src_vert[(y_qn >> SCALE_SUBPEL_BITS) * im_stride];
      const int y_filter_idx = (y_qn & SCALE_SUBPEL_MASK) >> SCALE_EXTRA_BITS;
      assert(y_filter_idx < SUBPEL_SHIFTS);
      const int16_t *y_filter =
          av1_get_interp_filter_subpel_kernel(*filter_params_y, y_filter_idx);
      CONV_BUF_TYPE sum = 0;
      for (k = 0; k < filter_params_y->taps; ++k) {
        sum += y_filter[k] * src_y[(k - fo_vert) * im_stride];
      }
      CONV_BUF_TYPE res = ROUND_POWER_OF_TWO(sum, conv_params->round_1);
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#if CONFIG_JNT_COMP
      if (conv_params->bck_offset == -1) {
        if (conv_params->do_average)
          dst[y * dst_stride + x] += res;
        else
          dst[y * dst_stride + x] = res;
      } else {
        if (conv_params->do_average == 0) {
          dst[y * dst_stride + x] = res * conv_params->fwd_offset;
        } else {
          dst[y * dst_stride + x] += res * conv_params->bck_offset;

          dst[y * dst_stride + x] >>= (DIST_PRECISION_BITS - 1);
        }
      }
#else
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      if (conv_params->do_average)
        dst[y * dst_stride + x] += res;
      else
        dst[y * dst_stride + x] = res;
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#endif  // CONFIG_JNT_COMP
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    }
    src_vert++;
  }
}

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#else
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/* When convolve-round is enabled and compound-round is disabled, we use a
   high-precision convolve filter.
   Note: For notes on hardware implementations, including the required
   bit widths for various intermediate values, see the comments above
   av1_warp_affine_c.
*/
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void av1_convolve_2d_c(const uint8_t *src, int src_stride, CONV_BUF_TYPE *dst,
                       int dst_stride, int w, int h,
                       InterpFilterParams *filter_params_x,
                       InterpFilterParams *filter_params_y,
                       const int subpel_x_q4, const int subpel_y_q4,
                       ConvolveParams *conv_params) {
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  int x, y, k;
  int32_t im_block[(MAX_SB_SIZE + MAX_FILTER_TAP - 1) * MAX_SB_SIZE];
  int im_h = h + filter_params_y->taps - 1;
  int im_stride = w;
  const int fo_vert = filter_params_y->taps / 2 - 1;
  const int fo_horiz = filter_params_x->taps / 2 - 1;
  const int bd = 8;

  // horizontal filter
  const uint8_t *src_horiz = src - fo_vert * src_stride;
  const int16_t *x_filter = av1_get_interp_filter_subpel_kernel(
      *filter_params_x, subpel_x_q4 & SUBPEL_MASK);
  for (y = 0; y < im_h; ++y) {
    for (x = 0; x < w; ++x) {
      int32_t sum = (1 << (bd + FILTER_BITS - 1));
      for (k = 0; k < filter_params_x->taps; ++k) {
        sum += x_filter[k] * src_horiz[y * src_stride + x - fo_horiz + k];
      }
      assert(0 <= sum && sum < (1 << (bd + FILTER_BITS + 1)));
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      im_block[y * im_stride + x] =
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          ROUND_POWER_OF_TWO(sum, conv_params->round_0);
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    }
  }

  // vertical filter
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  int32_t *src_vert = im_block + fo_vert * im_stride;
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  const int16_t *y_filter = av1_get_interp_filter_subpel_kernel(
      *filter_params_y, subpel_y_q4 & SUBPEL_MASK);
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  const int offset_bits = bd + 2 * FILTER_BITS - conv_params->round_0;
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  for (y = 0; y < h; ++y) {
    for (x = 0; x < w; ++x) {
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      CONV_BUF_TYPE sum = 1 << offset_bits;
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      for (k = 0; k < filter_params_y->taps; ++k) {
        sum += y_filter[k] * src_vert[(y - fo_vert + k) * im_stride + x];
      }
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      assert(0 <= sum && sum < (1 << (offset_bits + 2)));
      CONV_BUF_TYPE res = ROUND_POWER_OF_TWO(sum, conv_params->round_1) -
                          ((1 << (offset_bits - conv_params->round_1)) +
                           (1 << (offset_bits - conv_params->round_1 - 1)));
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#if CONFIG_JNT_COMP
      if (conv_params->fwd_offset == -1) {
        if (conv_params->do_average)
          dst[y * dst_stride + x] += res;
        else
          dst[y * dst_stride + x] = res;
      } else {
        if (conv_params->do_average) {
          dst[y * dst_stride + x] += res * conv_params->bck_offset;

          dst[y * dst_stride + x] >>= (DIST_PRECISION_BITS - 1);
        } else {
          dst[y * dst_stride + x] = res * conv_params->fwd_offset;
        }
      }
#else
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      if (conv_params->do_average)
        dst[y * dst_stride + x] += res;
      else
        dst[y * dst_stride + x] = res;
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#endif  // CONFIG_JNT_COMP
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    }
  }
}
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void av1_convolve_2d_scale_c(const uint8_t *src, int src_stride,
                             CONV_BUF_TYPE *dst, int dst_stride, int w, int h,
                             InterpFilterParams *filter_params_x,
                             InterpFilterParams *filter_params_y,
                             const int subpel_x_qn, const int x_step_qn,
                             const int subpel_y_qn, const int y_step_qn,
                             ConvolveParams *conv_params) {
  int x, y, k;
  int32_t im_block[(2 * MAX_SB_SIZE + MAX_FILTER_TAP) * MAX_SB_SIZE];
  int im_h = (((h - 1) * y_step_qn + subpel_y_qn) >> SCALE_SUBPEL_BITS) +
             filter_params_y->taps;
  int im_stride = w;
  const int fo_vert = filter_params_y->taps / 2 - 1;
  const int fo_horiz = filter_params_x->taps / 2 - 1;
  const int bd = 8;

  // horizontal filter
  const uint8_t *src_horiz = src - fo_vert * src_stride;
  for (y = 0; y < im_h; ++y) {
    int x_qn = subpel_x_qn;
    for (x = 0; x < w; ++x, x_qn += x_step_qn) {
      const uint8_t *const src_x = &src_horiz[(x_qn >> SCALE_SUBPEL_BITS)];
      const int x_filter_idx = (x_qn & SCALE_SUBPEL_MASK) >> SCALE_EXTRA_BITS;
      assert(x_filter_idx < SUBPEL_SHIFTS);
      const int16_t *x_filter =
          av1_get_interp_filter_subpel_kernel(*filter_params_x, x_filter_idx);
      int32_t sum = (1 << (bd + FILTER_BITS - 1));
      for (k = 0; k < filter_params_x->taps; ++k) {
        sum += x_filter[k] * src_x[k - fo_horiz];
      }
      assert(0 <= sum && sum < (1 << (bd + FILTER_BITS + 1)));
      im_block[y * im_stride + x] =
          ROUND_POWER_OF_TWO(sum, conv_params->round_0);
    }
    src_horiz += src_stride;
  }

  // vertical filter
  int32_t *src_vert = im_block + fo_vert * im_stride;
  const int offset_bits = bd + 2 * FILTER_BITS - conv_params->round_0;
  for (x = 0; x < w; ++x) {
    int y_qn = subpel_y_qn;
    for (y = 0; y < h; ++y, y_qn += y_step_qn) {
      const int32_t *src_y = &src_vert[(y_qn >> SCALE_SUBPEL_BITS) * im_stride];
      const int y_filter_idx = (y_qn & SCALE_SUBPEL_MASK) >> SCALE_EXTRA_BITS;
      assert(y_filter_idx < SUBPEL_SHIFTS);
      const int16_t *y_filter =
          av1_get_interp_filter_subpel_kernel(*filter_params_y, y_filter_idx);
      CONV_BUF_TYPE sum = 1 << offset_bits;
      for (k = 0; k < filter_params_y->taps; ++k) {
        sum += y_filter[k] * src_y[(k - fo_vert) * im_stride];
      }
      assert(0 <= sum && sum < (1 << (offset_bits + 2)));
      CONV_BUF_TYPE res = ROUND_POWER_OF_TWO(sum, conv_params->round_1) -
                          ((1 << (offset_bits - conv_params->round_1)) +
                           (1 << (offset_bits - conv_params->round_1 - 1)));
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#if CONFIG_JNT_COMP
      if (conv_params->fwd_offset == -1) {
        if (conv_params->do_average)
          dst[y * dst_stride + x] += res;
        else
          dst[y * dst_stride + x] = res;
      } else {
        if (conv_params->do_average) {
          dst[y * dst_stride + x] += res * conv_params->bck_offset;

          dst[y * dst_stride + x] >>= (DIST_PRECISION_BITS - 1);
        } else {
          dst[y * dst_stride + x] = res * conv_params->fwd_offset;
        }
      }
#else
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      if (conv_params->do_average)
        dst[y * dst_stride + x] += res;
      else
        dst[y * dst_stride + x] = res;
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#endif  // CONFIG_JNT_COMP
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    }
    src_vert++;
  }
}
#endif  // CONFIG_COMPOUND_ROUND
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void av1_convolve_2d_facade(const uint8_t *src, int src_stride, uint8_t *dst,
                            int dst_stride, int w, int h,
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                            InterpFilters interp_filters, const int subpel_x_q4,
                            int x_step_q4, const int subpel_y_q4, int y_step_q4,
                            int scaled, ConvolveParams *conv_params) {
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  (void)x_step_q4;
  (void)y_step_q4;
  (void)dst;
  (void)dst_stride;
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  InterpFilterParams filter_params_x, filter_params_y;
  av1_get_convolve_filter_params(interp_filters, 1, &filter_params_x,
                                 &filter_params_y);
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  if (filter_params_y.taps < filter_params_x.taps) {
    uint8_t tr_src[(MAX_SB_SIZE + MAX_FILTER_TAP - 1) *
                   (MAX_SB_SIZE + MAX_FILTER_TAP - 1)];
    int tr_src_stride = MAX_SB_SIZE + MAX_FILTER_TAP - 1;
    CONV_BUF_TYPE tr_dst[MAX_SB_SIZE * MAX_SB_SIZE];
    int tr_dst_stride = MAX_SB_SIZE;
    int fo_vert = filter_params_y.taps / 2 - 1;
    int fo_horiz = filter_params_x.taps / 2 - 1;

    transpose_uint8(tr_src, tr_src_stride,
                    src - fo_vert * src_stride - fo_horiz, src_stride,
                    w + filter_params_x.taps - 1, h + filter_params_y.taps - 1);
    transpose_int32(tr_dst, tr_dst_stride, conv_params->dst,
                    conv_params->dst_stride, w, h);

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// horizontal and vertical parameters are swapped because of the transpose
#if CONFIG_JNT_COMP
    if (scaled)
      av1_convolve_2d_scale_c(tr_src + fo_horiz * tr_src_stride + fo_vert,
                              tr_src_stride, tr_dst, tr_dst_stride, h, w,
                              &filter_params_y, &filter_params_x, subpel_y_q4,
                              y_step_q4, subpel_x_q4, x_step_q4, conv_params);
    else
      av1_convolve_2d_c(tr_src + fo_horiz * tr_src_stride + fo_vert,
                        tr_src_stride, tr_dst, tr_dst_stride, h, w,
                        &filter_params_y, &filter_params_x, subpel_y_q4,
                        subpel_x_q4, conv_params);
#else
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    if (scaled)
      av1_convolve_2d_scale(tr_src + fo_horiz * tr_src_stride + fo_vert,
                            tr_src_stride, tr_dst, tr_dst_stride, h, w,
                            &filter_params_y, &filter_params_x, subpel_y_q4,
                            y_step_q4, subpel_x_q4, x_step_q4, conv_params);
    else
      av1_convolve_2d(tr_src + fo_horiz * tr_src_stride + fo_vert,
                      tr_src_stride, tr_dst, tr_dst_stride, h, w,
                      &filter_params_y, &filter_params_x, subpel_y_q4,
                      subpel_x_q4, conv_params);
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#endif  // CONFIG_JNT_COMP
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    transpose_int32(conv_params->dst, conv_params->dst_stride, tr_dst,
                    tr_dst_stride, h, w);
  } else {
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#if CONFIG_JNT_COMP
    if (scaled)
      av1_convolve_2d_scale_c(src, src_stride, conv_params->dst,
                              conv_params->dst_stride, w, h, &filter_params_x,
                              &filter_params_y, subpel_x_q4, x_step_q4,
                              subpel_y_q4, y_step_q4, conv_params);
    else
      av1_convolve_2d_c(src, src_stride, conv_params->dst,
                        conv_params->dst_stride, w, h, &filter_params_x,
                        &filter_params_y, subpel_x_q4, subpel_y_q4,
                        conv_params);
#else
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    if (scaled)
      av1_convolve_2d_scale(src, src_stride, conv_params->dst,
                            conv_params->dst_stride, w, h, &filter_params_x,
                            &filter_params_y, subpel_x_q4, x_step_q4,
                            subpel_y_q4, y_step_q4, conv_params);
    else
      av1_convolve_2d(src, src_stride, conv_params->dst,
                      conv_params->dst_stride, w, h, &filter_params_x,
                      &filter_params_y, subpel_x_q4, subpel_y_q4, conv_params);
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#endif  // CONFIG_JNT_COMP
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  }
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}

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#if CONFIG_HIGHBITDEPTH
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void av1_highbd_convolve_rounding_c(const int32_t *src, int src_stride,
                                    uint8_t *dst8, int dst_stride, int w, int h,
                                    int bits, int bd) {
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  uint16_t *dst = CONVERT_TO_SHORTPTR(dst8);
  int r, c;
  for (r = 0; r < h; ++r) {
    for (c = 0; c < w; ++c) {
      dst[r * dst_stride + c] = clip_pixel_highbd(
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          ROUND_POWER_OF_TWO(src[r * src_stride + c], bits), bd);
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    }
  }
}

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#if CONFIG_COMPOUND_ROUND
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void av1_highbd_convolve_2d_c(const uint16_t *src, int src_stride,
                              CONV_BUF_TYPE *dst, int dst_stride, int w, int h,
                              InterpFilterParams *filter_params_x,
                              InterpFilterParams *filter_params_y,
                              const int subpel_x_q4, const int subpel_y_q4,
                              ConvolveParams *conv_params, int bd) {
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  int x, y, k;
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  uint16_t im_block[(MAX_SB_SIZE + MAX_FILTER_TAP - 1) * MAX_SB_SIZE];
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  int im_h = h + filter_params_y->taps - 1;
  int im_stride = w;
  const int fo_vert = filter_params_y->taps / 2 - 1;
  const int fo_horiz = filter_params_x->taps / 2 - 1;
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  // horizontal filter
  const uint16_t *src_horiz = src - fo_vert * src_stride;
  const int16_t *x_filter = av1_get_interp_filter_subpel_kernel(
      *filter_params_x, subpel_x_q4 & SUBPEL_MASK);
  for (y = 0; y < im_h; ++y) {
    for (x = 0; x < w; ++x) {
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      int32_t sum = 0;
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      for (k = 0; k < filter_params_x->taps; ++k) {
        sum += x_filter[k] * src_horiz[y * src_stride + x - fo_horiz + k];
      }
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      im_block[y * im_stride + x] =
          clip_pixel_highbd(ROUND_POWER_OF_TWO(sum, conv_params->round_0), bd);
    }
  }

  // vertical filter
  uint16_t *src_vert = im_block + fo_vert * im_stride;
  const int16_t *y_filter = av1_get_interp_filter_subpel_kernel(
      *filter_params_y, subpel_y_q4 & SUBPEL_MASK);
  for (y = 0; y < h; ++y) {
    for (x = 0; x < w; ++x) {
      CONV_BUF_TYPE sum = 0;
      for (k = 0; k < filter_params_y->taps; ++k) {
        sum += y_filter[k] * src_vert[(y - fo_vert + k) * im_stride + x];
      }
      CONV_BUF_TYPE res = ROUND_POWER_OF_TWO(sum, conv_params->round_1);
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      if (conv_params->do_average)
        dst[y * dst_stride + x] += res;
      else
        dst[y * dst_stride + x] = res;
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    }
  }
}
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void av1_highbd_convolve_2d_scale_c(const uint16_t *src, int src_stride,
                                    CONV_BUF_TYPE *dst, int dst_stride, int w,
                                    int h, InterpFilterParams *filter_params_x,
                                    InterpFilterParams *filter_params_y,
                                    const int subpel_x_qn, const int x_step_qn,
                                    const int subpel_y_qn, const int y_step_qn,
                                    ConvolveParams *conv_params, int bd) {
  int x, y, k;
  uint16_t im_block[(2 * MAX_SB_SIZE + MAX_FILTER_TAP) * MAX_SB_SIZE];
  int im_h = (((h - 1) * y_step_qn + subpel_y_qn) >> SCALE_SUBPEL_BITS) +
             filter_params_y->taps;
  int im_stride = w;
  const int fo_vert = filter_params_y->taps / 2 - 1;
  const int fo_horiz = filter_params_x->taps / 2 - 1;
  (void)bd;

  // horizontal filter
  const uint16_t *src_horiz = src - fo_vert * src_stride;
  for (y = 0; y < im_h; ++y) {
    int x_qn = subpel_x_qn;
    for (x = 0; x < w; ++x, x_qn += x_step_qn) {
      const uint16_t *const src_x = &src_horiz[(x_qn >> SCALE_SUBPEL_BITS)];
      const int x_filter_idx = (x_qn & SCALE_SUBPEL_MASK) >> SCALE_EXTRA_BITS;
      assert(x_filter_idx < SUBPEL_SHIFTS);
      const int16_t *x_filter =
          av1_get_interp_filter_subpel_kernel(*filter_params_x, x_filter_idx);
      int sum = 0;
      for (k = 0; k < filter_params_x->taps; ++k)
        sum += x_filter[k] * src_x[k - fo_horiz];
      im_block[y * im_stride + x] =
          clip_pixel(ROUND_POWER_OF_TWO(sum, conv_params->round_0));
    }
    src_horiz += src_stride;
  }

  // vertical filter
  uint16_t *src_vert = im_block + fo_vert * im_stride;
  for (x = 0; x < w; ++x) {
    int y_qn = subpel_y_qn;
    for (y = 0; y < h; ++y, y_qn += y_step_qn) {
      const uint16_t *const src_y =
          &src_vert[(y_qn >> SCALE_SUBPEL_BITS) * im_stride];
      const int y_filter_idx = (y_qn & SCALE_SUBPEL_MASK) >> SCALE_EXTRA_BITS;
      assert(y_filter_idx < SUBPEL_SHIFTS);
      const int16_t *y_filter =
          av1_get_interp_filter_subpel_kernel(*filter_params_y, y_filter_idx);
      CONV_BUF_TYPE sum = 0;
      for (k = 0; k < filter_params_y->taps; ++k) {
        sum += y_filter[k] * src_y[(k - fo_vert) * im_stride];
      }
      CONV_BUF_TYPE res = ROUND_POWER_OF_TWO(sum, conv_params->round_1);
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      if (conv_params->do_average)
        dst[y * dst_stride + x] += res;
      else
        dst[y * dst_stride + x] = res;
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    }
    src_vert++;
  }
}

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#else
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void av1_highbd_convolve_2d_c(const uint16_t *src, int src_stride,
                              CONV_BUF_TYPE *dst, int dst_stride, int w, int h,
                              InterpFilterParams *filter_params_x,
                              InterpFilterParams *filter_params_y,
                              const int subpel_x_q4, const int subpel_y_q4,
                              ConvolveParams *conv_params, int bd) {
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  int x, y, k;
  int32_t im_block[(MAX_SB_SIZE + MAX_FILTER_TAP - 1) * MAX_SB_SIZE];
  int im_h = h + filter_params_y->taps - 1;
  int im_stride = w;
  const int fo_vert = filter_params_y->taps / 2 - 1;
  const int fo_horiz = filter_params_x->taps / 2 - 1;

  // horizontal filter
  const uint16_t *src_horiz = src - fo_vert * src_stride;
  const int16_t *x_filter = av1_get_interp_filter_subpel_kernel(
      *filter_params_x, subpel_x_q4 & SUBPEL_MASK);
  for (y = 0; y < im_h; ++y) {
    for (x = 0; x < w; ++x) {
      int32_t sum = (1 << (bd + FILTER_BITS - 1));
      for (k = 0; k < filter_params_x->taps; ++k) {
        sum += x_filter[k] * src_horiz[y * src_stride + x - fo_horiz + k];
      }
      assert(0 <= sum && sum < (1 << (bd + FILTER_BITS + 1)));
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      (void)bd;
      im_block[y * im_stride + x] =
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          ROUND_POWER_OF_TWO(sum, conv_params->round_0);
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    }
  }

  // vertical filter
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  int32_t *src_vert = im_block + fo_vert * im_stride;
  const int offset_bits = bd + 2 * FILTER_BITS - conv_params->round_0;
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  const int16_t *y_filter = av1_get_interp_filter_subpel_kernel(
      *filter_params_y, subpel_y_q4 & SUBPEL_MASK);
  for (y = 0; y < h; ++y) {
    for (x = 0; x < w; ++x) {
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      CONV_BUF_TYPE sum = 1 << offset_bits;
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      for (k = 0; k < filter_params_y->taps; ++k) {
        sum += y_filter[k] * src_vert[(y - fo_vert + k) * im_stride + x];
      }
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      assert(0 <= sum && sum < (1 << (offset_bits + 2)));
      CONV_BUF_TYPE res = ROUND_POWER_OF_TWO(sum, conv_params->round_1) -
                          ((1 << (offset_bits - conv_params->round_1)) +
                           (1 << (offset_bits - conv_params->round_1 - 1)));
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      if (conv_params->do_average)
        dst[y * dst_stride + x] += res;
      else
        dst[y * dst_stride + x] = res;
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    }
  }
}
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void av1_highbd_convolve_2d_scale_c(const uint16_t *src, int src_stride,
                                    CONV_BUF_TYPE *dst, int dst_stride, int w,
                                    int h, InterpFilterParams *filter_params_x,
                                    InterpFilterParams *filter_params_y,
                                    const int subpel_x_qn, const int x_step_qn,
                                    const int subpel_y_qn, const int y_step_qn,
                                    ConvolveParams *conv_params, int bd) {
  int x, y, k;
  int32_t im_block[(2 * MAX_SB_SIZE + MAX_FILTER_TAP) * MAX_SB_SIZE];
  int im_h = (((h - 1) * y_step_qn + subpel_y_qn) >> SCALE_SUBPEL_BITS) +
             filter_params_y->taps;
  int im_stride = w;
  const int fo_vert = filter_params_y->taps / 2 - 1;
  const int fo_horiz = filter_params_x->taps / 2 - 1;

  // horizontal filter
  const uint16_t *src_horiz = src - fo_vert * src_stride;
  for (y = 0; y < im_h; ++y) {
    int x_qn = subpel_x_qn;
    for (x = 0; x < w; ++x, x_qn += x_step_qn) {
      const uint16_t *const src_x = &src_horiz[(x_qn >> SCALE_SUBPEL_BITS)];
      const int x_filter_idx = (x_qn & SCALE_SUBPEL_MASK) >> SCALE_EXTRA_BITS;
      assert(x_filter_idx < SUBPEL_SHIFTS);
      const int16_t *x_filter =
          av1_get_interp_filter_subpel_kernel(*filter_params_x, x_filter_idx);
      int32_t sum = (1 << (bd + FILTER_BITS - 1));
      for (k = 0; k < filter_params_x->taps; ++k) {
        sum += x_filter[k] * src_x[k - fo_horiz];
      }
      assert(0 <= sum && sum < (1 << (bd + FILTER_BITS + 1)));
      im_block[y * im_stride + x] =
          ROUND_POWER_OF_TWO(sum, conv_params->round_0);
    }
    src_horiz += src_stride;
  }

  // vertical filter
  int32_t *src_vert = im_block + fo_vert * im_stride;
  const int offset_bits = bd + 2 * FILTER_BITS - conv_params->round_0;
  for (x = 0; x < w; ++x) {
    int y_qn = subpel_y_qn;
    for (y = 0; y < h; ++y, y_qn += y_step_qn) {
      const int32_t *src_y = &src_vert[(y_qn >> SCALE_SUBPEL_BITS) * im_stride];
      const int y_filter_idx = (y_qn & SCALE_SUBPEL_MASK) >> SCALE_EXTRA_BITS;
      assert(y_filter_idx < SUBPEL_SHIFTS);
      const int16_t *y_filter =
          av1_get_interp_filter_subpel_kernel(*filter_params_y, y_filter_idx);
      CONV_BUF_TYPE sum = 1 << offset_bits;
      for (k = 0; k < filter_params_y->taps; ++k) {
        sum += y_filter[k] * src_y[(k - fo_vert) * im_stride];
      }
      assert(0 <= sum && sum < (1 << (offset_bits + 2)));
      CONV_BUF_TYPE res = ROUND_POWER_OF_TWO(sum, conv_params->round_1) -
                          ((1 << (offset_bits - conv_params->round_1)) +
                           (1 << (offset_bits - conv_params->round_1 - 1)));
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      if (conv_params->do_average)
        dst[y * dst_stride + x] += res;
      else
        dst[y * dst_stride + x] = res;
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    }
    src_vert++;
  }
}
#endif  // CONFIG_COMPOUND_ROUND
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void av1_highbd_convolve_2d_facade(const uint8_t *src8, int src_stride,
                                   uint8_t *dst, int dst_stride, int w, int h,
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                                   InterpFilters interp_filters,
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                                   const int subpel_x_q4, int x_step_q4,
                                   const int subpel_y_q4, int y_step_q4,
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                                   int scaled, ConvolveParams *conv_params,
                                   int bd) {
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  (void)x_step_q4;
  (void)y_step_q4;
  (void)dst;
  (void)dst_stride;
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  InterpFilterParams filter_params_x, filter_params_y;
  av1_get_convolve_filter_params(interp_filters, 1, &filter_params_x,
                                 &filter_params_y);

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  const uint16_t *src = CONVERT_TO_SHORTPTR(src8);
  if (filter_params_y.taps < filter_params_x.taps) {
    uint16_t tr_src[(MAX_SB_SIZE + MAX_FILTER_TAP - 1) *
                    (MAX_SB_SIZE + MAX_FILTER_TAP - 1)];
    int tr_src_stride = MAX_SB_SIZE + MAX_FILTER_TAP - 1;
    CONV_BUF_TYPE tr_dst[MAX_SB_SIZE * MAX_SB_SIZE];
    int tr_dst_stride = MAX_SB_SIZE;
    int fo_vert = filter_params_y.taps / 2 - 1;
    int fo_horiz = filter_params_x.taps / 2 - 1;

    transpose_uint16(
        tr_src, tr_src_stride, src - fo_vert * src_stride - fo_horiz,
        src_stride, w + filter_params_x.taps - 1, h + filter_params_y.taps - 1);
    transpose_int32(tr_dst, tr_dst_stride, conv_params->dst,
                    conv_params->dst_stride, w, h);

    // horizontal and vertical parameters are swapped because of the transpose
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    if (scaled)
      av1_highbd_convolve_2d_scale(
          tr_src + fo_horiz * tr_src_stride + fo_vert, tr_src_stride, tr_dst,
          tr_dst_stride, h, w, &filter_params_y, &filter_params_x, subpel_y_q4,
          y_step_q4, subpel_x_q4, x_step_q4, conv_params, bd);
    else
      av1_highbd_convolve_2d(tr_src + fo_horiz * tr_src_stride + fo_vert,
                             tr_src_stride, tr_dst, tr_dst_stride, h, w,
                             &filter_params_y, &filter_params_x, subpel_y_q4,
                             subpel_x_q4, conv_params, bd);
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    transpose_int32(conv_params->dst, conv_params->dst_stride, tr_dst,
                    tr_dst_stride, h, w);
  } else {
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    if (scaled)
      av1_highbd_convolve_2d_scale(
          src, src_stride, conv_params->dst, conv_params->dst_stride, w, h,
          &filter_params_x, &filter_params_y, subpel_x_q4, x_step_q4,
          subpel_y_q4, y_step_q4, conv_params, bd);
    else
      av1_highbd_convolve_2d(src, src_stride, conv_params->dst,
                             conv_params->dst_stride, w, h, &filter_params_x,
                             &filter_params_y, subpel_x_q4, subpel_y_q4,
                             conv_params, bd);
  }
}
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#endif  // CONFIG_HIGHBITDEPTH

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#endif  // CONFIG_CONVOLVE_ROUND
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typedef void (*ConvolveFunc)(const uint8_t *src, int src_stride, uint8_t *dst,
                             int dst_stride, int w, int h,
                             const InterpFilterParams filter_params,
                             const int subpel_q4, int step_q4,
                             ConvolveParams *conv_params);

static void convolve_helper(const uint8_t *src, int src_stride, uint8_t *dst,
                            int dst_stride, int w, int h,
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                            const InterpFilters interp_filters,
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                            const int subpel_x_q4, int x_step_q4,
                            const int subpel_y_q4, int y_step_q4,
                            ConvolveParams *conv_params,
                            ConvolveFunc convolve_horiz,
                            ConvolveFunc convolve_vert) {
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  int ignore_horiz = x_step_q4 == SUBPEL_SHIFTS && subpel_x_q4 == 0;
  int ignore_vert = y_step_q4 == SUBPEL_SHIFTS && subpel_y_q4 == 0;
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  InterpFilterParams filter_params_x, filter_params_y;
  av1_get_convolve_filter_params(interp_filters, 0, &filter_params_x,
                                 &filter_params_y);

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  assert(conv_params->round == CONVOLVE_OPT_ROUND);
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  assert(w <= MAX_BLOCK_WIDTH);
  assert(h <= MAX_BLOCK_HEIGHT);
  assert(y_step_q4 <= MAX_STEP);
  assert(x_step_q4 <= MAX_STEP);

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  if (ignore_horiz && ignore_vert) {
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    convolve_copy(src, src_stride, dst, dst_stride, w, h, conv_params);
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  } else if (ignore_vert) {
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    assert(filter_params_x.taps <= MAX_FILTER_TAP);
    convolve_horiz(src, src_stride, dst, dst_stride, w, h, filter_params_x,
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                   subpel_x_q4, x_step_q4, conv_params);
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  } else if (ignore_horiz) {
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    assert(filter_params_y.taps <= MAX_FILTER_TAP);
    convolve_vert(src, src_stride, dst, dst_stride, w, h, filter_params_y,
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                  subpel_y_q4, y_step_q4, conv_params);
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  } else {
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    // temp's size is set to a 256 aligned value to facilitate SIMD
    // implementation. The value is greater than (maximum possible intermediate
    // height or width) * MAX_SB_SIZE
    DECLARE_ALIGNED(16, uint8_t,
                    temp[((MAX_SB_SIZE * 2 + 16) + 16) * MAX_SB_SIZE]);
    int max_intermediate_size = ((MAX_SB_SIZE * 2 + 16) + 16);
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    int filter_size;
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#if CONFIG_DUAL_FILTER && USE_EXTRA_FILTER
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    av1_convolve_filter_params_fixup_1212(&filter_params_x, &filter_params_y);
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    // we do filter with fewer taps first to reduce hardware implementation
    // complexity
    if (filter_params_y.taps < filter_params_x.taps) {
      int intermediate_width;
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      int temp_stride = max_intermediate_size;
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      ConvolveParams temp_conv_params;
      temp_conv_params.ref = 0;
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      temp_conv_params.do_average = 0;
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      temp_conv_params.round = CONVOLVE_OPT_ROUND;
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      filter_size = filter_params_x.taps;
      intermediate_width =
          (((w - 1) * x_step_q4 + subpel_x_q4) >> SUBPEL_BITS) + filter_size;
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      assert(intermediate_width <= max_intermediate_size);
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      assert(filter_params_y.taps <= MAX_FILTER_TAP);
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      convolve_vert(src - (filter_size / 2 - 1), src_stride, temp, temp_stride,
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                    intermediate_width, h, filter_params_y, subpel_y_q4,
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                    y_step_q4, &temp_conv_params);
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      assert(filter_params_x.taps <= MAX_FILTER_TAP);
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      convolve_horiz(temp + (filter_size / 2 - 1), temp_stride, dst, dst_stride,
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                     w, h, filter_params_x, subpel_x_q4, x_step_q4,
                     conv_params);
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    } else
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#endif  // CONFIG_DUAL_FILTER && USE_EXTRA_FILTER
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    {
      int intermediate_height;
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      int temp_stride = MAX_SB_SIZE;
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      ConvolveParams temp_conv_params;
      temp_conv_params.ref = 0;
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      temp_conv_params.do_average = 0;
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      temp_conv_params.round = CONVOLVE_OPT_ROUND;
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      filter_size = filter_params_y.taps;
      intermediate_height =
          (((h - 1) * y_step_q4 + subpel_y_q4) >> SUBPEL_BITS) + filter_size;
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      assert(intermediate_height <= max_intermediate_size);
      (void)max_intermediate_size;
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      assert(filter_params_x.taps <= MAX_FILTER_TAP);
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      convolve_horiz(src - src_stride * (filter_size / 2 - 1), src_stride, temp,
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                     temp_stride, w, intermediate_height, filter_params_x,
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                     subpel_x_q4, x_step_q4, &temp_conv_params);
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      assert(filter_params_y.taps <= MAX_FILTER_TAP);
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      convolve_vert(temp + temp_stride * (filter_size / 2 - 1), temp_stride,
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                    dst, dst_stride, w, h, filter_params_y, subpel_y_q4,
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                    y_step_q4, conv_params);
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    }
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  }
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}

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static void convolve_scale_helper(const uint8_t *src, int src_stride,
                                  uint8_t *dst, int dst_stride, int w, int h,
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                                  const InterpFilters interp_filters,
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                                  const int subpel_x_qn, int x_step_qn,
                                  const int subpel_y_qn, int y_step_qn,
                                  ConvolveParams *conv_params,
                                  ConvolveFunc convolve_horiz,
                                  ConvolveFunc convolve_vert) {
  int ignore_horiz = x_step_qn == SCALE_SUBPEL_SHIFTS && subpel_x_qn == 0;
  int ignore_vert = y_step_qn == SCALE_SUBPEL_SHIFTS && subpel_y_qn == 0;
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  InterpFilterParams filter_params_x, filter_params_y;
  av1_get_convolve_filter_params(interp_filters, 0, &filter_params_x,
                                 &filter_params_y);

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  assert(conv_params->round == CONVOLVE_OPT_ROUND);
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  assert(w <= MAX_BLOCK_WIDTH);
  assert(h <= MAX_BLOCK_HEIGHT);
  assert(y_step_qn <= (MAX_STEP << SCALE_EXTRA_BITS));
  assert(x_step_qn <= (MAX_STEP << SCALE_EXTRA_BITS));

  if (ignore_horiz && ignore_vert) {
    convolve_copy(src, src_stride, dst, dst_stride, w, h, conv_params);
  } else if (ignore_vert) {
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    assert(filter_params_x.taps <= MAX_FILTER_TAP);
    convolve_horiz(src, src_stride, dst, dst_stride, w, h, filter_params_x,
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                   subpel_x_qn, x_step_qn, conv_params);
  } else if (ignore_horiz) {
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    assert(filter_params_y.taps <= MAX_FILTER_TAP);
    convolve_vert(src, src_stride, dst, dst_stride, w, h, filter_params_y,
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