vp9_blockd.h 21.1 KB
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/*
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 *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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 *
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 *  Use of this source code is governed by a BSD-style license
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 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
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 *  in the file PATENTS.  All contributing project authors may
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 *  be found in the AUTHORS file in the root of the source tree.
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 */


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#ifndef VP9_COMMON_VP9_BLOCKD_H_
#define VP9_COMMON_VP9_BLOCKD_H_
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#include "./vpx_config.h"
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#include "vpx_ports/mem.h"
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#include "vpx_scale/yv12config.h"
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#include "vp9/common/vp9_common.h"
#include "vp9/common/vp9_common_data.h"
#include "vp9/common/vp9_enums.h"
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#include "vp9/common/vp9_mv.h"
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#include "vp9/common/vp9_scale.h"
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#include "vp9/common/vp9_seg_common.h"
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#include "vp9/common/vp9_treecoder.h"
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#define BLOCK_SIZE_GROUPS   4
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#define MBSKIP_CONTEXTS 3

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/* Segment Feature Masks */
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#define MAX_MV_REF_CANDIDATES 2
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#define INTRA_INTER_CONTEXTS 4
#define COMP_INTER_CONTEXTS 5
#define REF_CONTEXTS 5

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typedef enum {
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  PLANE_TYPE_Y_WITH_DC,
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  PLANE_TYPE_UV,
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} PLANE_TYPE;
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typedef char ENTROPY_CONTEXT;
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typedef char PARTITION_CONTEXT;

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static INLINE int combine_entropy_contexts(ENTROPY_CONTEXT a,
                                           ENTROPY_CONTEXT b) {
  return (a != 0) + (b != 0);
}
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typedef enum {
  KEY_FRAME = 0,
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  INTER_FRAME = 1,
  NUM_FRAME_TYPES,
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} FRAME_TYPE;

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typedef enum {
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  EIGHTTAP = 0,
  EIGHTTAP_SMOOTH = 1,
  EIGHTTAP_SHARP = 2,
  BILINEAR = 3,
  SWITCHABLE = 4  /* should be the last one */
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} INTERPOLATIONFILTERTYPE;

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typedef enum {
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  DC_PRED,         // Average of above and left pixels
  V_PRED,          // Vertical
  H_PRED,          // Horizontal
  D45_PRED,        // Directional 45  deg = round(arctan(1/1) * 180/pi)
  D135_PRED,       // Directional 135 deg = 180 - 45
  D117_PRED,       // Directional 117 deg = 180 - 63
  D153_PRED,       // Directional 153 deg = 180 - 27
  D27_PRED,        // Directional 27  deg = round(arctan(1/2) * 180/pi)
  D63_PRED,        // Directional 63  deg = round(arctan(2/1) * 180/pi)
  TM_PRED,         // True-motion
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  NEARESTMV,
  NEARMV,
  ZEROMV,
  NEWMV,
  MB_MODE_COUNT
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} MB_PREDICTION_MODE;

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static INLINE int is_intra_mode(MB_PREDICTION_MODE mode) {
  return mode <= TM_PRED;
}

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static INLINE int is_inter_mode(MB_PREDICTION_MODE mode) {
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  return mode >= NEARESTMV && mode <= NEWMV;
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}

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#define VP9_INTRA_MODES (TM_PRED + 1)
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#define VP9_INTER_MODES (1 + NEWMV - NEARESTMV)
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static INLINE int inter_mode_offset(MB_PREDICTION_MODE mode) {
  return (mode - NEARESTMV);
}

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/* For keyframes, intra block modes are predicted by the (already decoded)
   modes for the Y blocks to the left and above us; for interframes, there
   is a single probability table. */

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union b_mode_info {
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  MB_PREDICTION_MODE as_mode;
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  int_mv as_mv[2];  // first, second inter predictor motion vectors
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};
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typedef enum {
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  NONE = -1,
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  INTRA_FRAME = 0,
  LAST_FRAME = 1,
  GOLDEN_FRAME = 2,
  ALTREF_FRAME = 3,
  MAX_REF_FRAMES = 4
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} MV_REFERENCE_FRAME;

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static INLINE int b_width_log2(BLOCK_SIZE_TYPE sb_type) {
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  return b_width_log2_lookup[sb_type];
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}
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static INLINE int b_height_log2(BLOCK_SIZE_TYPE sb_type) {
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  return b_height_log2_lookup[sb_type];
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}
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static INLINE int mi_width_log2(BLOCK_SIZE_TYPE sb_type) {
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  return mi_width_log2_lookup[sb_type];
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}

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static INLINE int mi_height_log2(BLOCK_SIZE_TYPE sb_type) {
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  return mi_height_log2_lookup[sb_type];
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}

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typedef struct {
  MB_PREDICTION_MODE mode, uv_mode;
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  MV_REFERENCE_FRAME ref_frame[2];
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  TX_SIZE txfm_size;
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  int_mv mv[2]; // for each reference frame used
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  int_mv ref_mvs[MAX_REF_FRAMES][MAX_MV_REF_CANDIDATES];
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  int_mv best_mv, best_second_mv;
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  uint8_t mb_mode_context[MAX_REF_FRAMES];
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  unsigned char mb_skip_coeff;                                /* does this mb has coefficients at all, 1=no coefficients, 0=need decode tokens */
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  unsigned char segment_id;           // Segment id for current frame
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  // Flags used for prediction status of various bit-stream signals
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  unsigned char seg_id_predicted;

  // Indicates if the mb is part of the image (1) vs border (0)
  // This can be useful in determining whether the MB provides
  // a valid predictor
  unsigned char mb_in_image;
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  INTERPOLATIONFILTERTYPE interp_filter;
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  BLOCK_SIZE_TYPE sb_type;
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} MB_MODE_INFO;

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typedef struct {
  MB_MODE_INFO mbmi;
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  union b_mode_info bmi[4];
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} MODE_INFO;

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static int is_inter_block(const MB_MODE_INFO *mbmi) {
  return mbmi->ref_frame[0] > INTRA_FRAME;
}


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enum mv_precision {
  MV_PRECISION_Q3,
  MV_PRECISION_Q4
};

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#if CONFIG_ALPHA
enum { MAX_MB_PLANE = 4 };
#else
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enum { MAX_MB_PLANE = 3 };
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#endif
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struct buf_2d {
  uint8_t *buf;
  int stride;
};

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struct macroblockd_plane {
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  DECLARE_ALIGNED(16, int16_t,  qcoeff[64 * 64]);
  DECLARE_ALIGNED(16, int16_t,  dqcoeff[64 * 64]);
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  DECLARE_ALIGNED(16, uint16_t, eobs[256]);
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  PLANE_TYPE plane_type;
  int subsampling_x;
  int subsampling_y;
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  struct buf_2d dst;
  struct buf_2d pre[2];
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  int16_t *dequant;
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  ENTROPY_CONTEXT *above_context;
  ENTROPY_CONTEXT *left_context;
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};

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#define BLOCK_OFFSET(x, i) ((x) + (i) * 16)
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typedef struct macroblockd {
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  struct macroblockd_plane plane[MAX_MB_PLANE];
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  struct scale_factors scale_factor[2];
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  MODE_INFO *prev_mode_info_context;
  MODE_INFO *mode_info_context;
  int mode_info_stride;
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  int up_available;
  int left_available;
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  int right_available;
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  struct segmentation seg;

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  // partition contexts
  PARTITION_CONTEXT *above_seg_context;
  PARTITION_CONTEXT *left_seg_context;

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  /* Distance of MB away from frame edges */
  int mb_to_left_edge;
  int mb_to_right_edge;
  int mb_to_top_edge;
  int mb_to_bottom_edge;

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  int lossless;
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  /* Inverse transform function pointers. */
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  void (*inv_txm4x4_1_add)(int16_t *input, uint8_t *dest, int stride);
  void (*inv_txm4x4_add)(int16_t *input, uint8_t *dest, int stride);
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  void (*itxm_add)(int16_t *input, uint8_t *dest, int stride, int eob);
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  struct subpix_fn_table  subpix;
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  int allow_high_precision_mv;
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  int corrupted;
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  unsigned char sb_index;   // index of 32x32 block inside the 64x64 block
  unsigned char mb_index;   // index of 16x16 block inside the 32x32 block
  unsigned char b_index;    // index of 8x8 block inside the 16x16 block
  unsigned char ab_index;   // index of 4x4 block inside the 8x8 block

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  int q_index;

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} MACROBLOCKD;

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static INLINE unsigned char *get_sb_index(MACROBLOCKD *xd, BLOCK_SIZE_TYPE subsize) {
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  switch (subsize) {
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    case BLOCK_64X64:
    case BLOCK_64X32:
    case BLOCK_32X64:
    case BLOCK_32X32:
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      return &xd->sb_index;
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    case BLOCK_32X16:
    case BLOCK_16X32:
    case BLOCK_16X16:
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      return &xd->mb_index;
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    case BLOCK_16X8:
    case BLOCK_8X16:
    case BLOCK_8X8:
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      return &xd->b_index;
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    case BLOCK_8X4:
    case BLOCK_4X8:
    case BLOCK_4X4:
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      return &xd->ab_index;
    default:
      assert(0);
      return NULL;
  }
}

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static INLINE void update_partition_context(MACROBLOCKD *xd,
                                            BLOCK_SIZE_TYPE sb_type,
                                            BLOCK_SIZE_TYPE sb_size) {
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  const int bsl = b_width_log2(sb_size), bs = (1 << bsl) / 2;
  const int bwl = b_width_log2(sb_type);
  const int bhl = b_height_log2(sb_type);
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  const int boffset = b_width_log2(BLOCK_64X64) - bsl;
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  const char pcval0 = ~(0xe << boffset);
  const char pcval1 = ~(0xf << boffset);
  const char pcvalue[2] = {pcval0, pcval1};
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  assert(MAX(bwl, bhl) <= bsl);
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  // update the partition context at the end notes. set partition bits
  // of block sizes larger than the current one to be one, and partition
  // bits of smaller block sizes to be zero.
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  vpx_memset(xd->above_seg_context, pcvalue[bwl == bsl], bs);
  vpx_memset(xd->left_seg_context, pcvalue[bhl == bsl], bs);
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}

static INLINE int partition_plane_context(MACROBLOCKD *xd,
                                          BLOCK_SIZE_TYPE sb_type) {
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  int bsl = mi_width_log2(sb_type), bs = 1 << bsl;
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  int above = 0, left = 0, i;
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  int boffset = mi_width_log2(BLOCK_64X64) - bsl;
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  assert(mi_width_log2(sb_type) == mi_height_log2(sb_type));
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  assert(bsl >= 0);
  assert(boffset >= 0);

  for (i = 0; i < bs; i++)
    above |= (xd->above_seg_context[i] & (1 << boffset));
  for (i = 0; i < bs; i++)
    left |= (xd->left_seg_context[i] & (1 << boffset));

  above = (above > 0);
  left  = (left > 0);

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  return (left * 2 + above) + bsl * PARTITION_PLOFFSET;
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}

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static BLOCK_SIZE_TYPE get_subsize(BLOCK_SIZE_TYPE bsize,
                                   PARTITION_TYPE partition) {
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  const BLOCK_SIZE_TYPE subsize = subsize_lookup[partition][bsize];
  assert(subsize < BLOCK_SIZES);
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  return subsize;
}

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extern const TX_TYPE mode2txfm_map[MB_MODE_COUNT];
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static INLINE TX_TYPE get_tx_type_4x4(PLANE_TYPE plane_type,
                                      const MACROBLOCKD *xd, int ib) {
  const MODE_INFO *const mi = xd->mode_info_context;
  const MB_MODE_INFO *const mbmi = &mi->mbmi;

  if (plane_type != PLANE_TYPE_Y_WITH_DC ||
      xd->lossless ||
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      is_inter_block(mbmi))
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    return DCT_DCT;
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  return mode2txfm_map[mbmi->sb_type < BLOCK_8X8 ?
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                       mi->bmi[ib].as_mode : mbmi->mode];
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}

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static INLINE TX_TYPE get_tx_type_8x8(PLANE_TYPE plane_type,
                                      const MACROBLOCKD *xd) {
  return plane_type == PLANE_TYPE_Y_WITH_DC ?
             mode2txfm_map[xd->mode_info_context->mbmi.mode] : DCT_DCT;
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}
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static INLINE TX_TYPE get_tx_type_16x16(PLANE_TYPE plane_type,
                                        const MACROBLOCKD *xd) {
  return plane_type == PLANE_TYPE_Y_WITH_DC ?
             mode2txfm_map[xd->mode_info_context->mbmi.mode] : DCT_DCT;
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}

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static void setup_block_dptrs(MACROBLOCKD *xd, int ss_x, int ss_y) {
  int i;

  for (i = 0; i < MAX_MB_PLANE; i++) {
    xd->plane[i].plane_type = i ? PLANE_TYPE_UV : PLANE_TYPE_Y_WITH_DC;
    xd->plane[i].subsampling_x = i ? ss_x : 0;
    xd->plane[i].subsampling_y = i ? ss_y : 0;
  }
#if CONFIG_ALPHA
  // TODO(jkoleszar): Using the Y w/h for now
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  xd->plane[3].subsampling_x = 0;
  xd->plane[3].subsampling_y = 0;
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#endif
}

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static INLINE TX_SIZE get_uv_tx_size(const MB_MODE_INFO *mbmi) {
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  return MIN(mbmi->txfm_size, max_uv_txsize_lookup[mbmi->sb_type]);
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}
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struct plane_block_idx {
  int plane;
  int block;
};

// TODO(jkoleszar): returning a struct so it can be used in a const context,
// expect to refactor this further later.
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static INLINE struct plane_block_idx plane_block_idx(int y_blocks,
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                                                     int b_idx) {
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  const int v_offset = y_blocks * 5 / 4;
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  struct plane_block_idx res;

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  if (b_idx < y_blocks) {
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    res.plane = 0;
    res.block = b_idx;
  } else if (b_idx < v_offset) {
    res.plane = 1;
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    res.block = b_idx - y_blocks;
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  } else {
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    assert(b_idx < y_blocks * 3 / 2);
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    res.plane = 2;
    res.block = b_idx - v_offset;
  }
  return res;
}

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static BLOCK_SIZE_TYPE get_plane_block_size(BLOCK_SIZE_TYPE bsize,
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                           const struct macroblockd_plane *pd) {
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  BLOCK_SIZE_TYPE bs = ss_size_lookup[bsize]
                                     [pd->subsampling_x][pd->subsampling_y];
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  assert(bs < BLOCK_SIZES);
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  return bs;
}

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static INLINE int plane_block_width(BLOCK_SIZE_TYPE bsize,
                                    const struct macroblockd_plane* plane) {
  return 4 << (b_width_log2(bsize) - plane->subsampling_x);
}

static INLINE int plane_block_height(BLOCK_SIZE_TYPE bsize,
                                     const struct macroblockd_plane* plane) {
  return 4 << (b_height_log2(bsize) - plane->subsampling_y);
}

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typedef void (*foreach_transformed_block_visitor)(int plane, int block,
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                                                  BLOCK_SIZE_TYPE bsize,
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                                                  int ss_txfrm_size,
                                                  void *arg);
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static INLINE void foreach_transformed_block_in_plane(
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    const MACROBLOCKD* const xd, BLOCK_SIZE_TYPE bsize, int plane,
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    foreach_transformed_block_visitor visit, void *arg) {
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  const struct macroblockd_plane *const pd = &xd->plane[plane];
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  // block and transform sizes, in number of 4x4 blocks log 2 ("*_b")
  // 4x4=0, 8x8=2, 16x16=4, 32x32=6, 64x64=8
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  // transform size varies per plane, look it up in a common way.
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  const MB_MODE_INFO* mbmi = &xd->mode_info_context->mbmi;
  const TX_SIZE tx_size = plane ? get_uv_tx_size(mbmi)
                                : mbmi->txfm_size;
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  const int bw = b_width_log2(bsize) - pd->subsampling_x;
  const int bh = b_height_log2(bsize) - pd->subsampling_y;
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  const int txfrm_size_b = tx_size * 2;
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  const int step = 1 << txfrm_size_b;
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  int i;

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  // If mb_to_right_edge is < 0 we are in a situation in which
  // the current block size extends into the UMV and we won't
  // visit the sub blocks that are wholly within the UMV.
  if (xd->mb_to_right_edge < 0 || xd->mb_to_bottom_edge < 0) {
    int r, c;
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    int max_blocks_wide = 1 << bw;
    int max_blocks_high = 1 << bh;
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    // xd->mb_to_right_edge is in units of pixels * 8.  This converts
    // it to 4x4 block sizes.
    if (xd->mb_to_right_edge < 0)
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      max_blocks_wide += (xd->mb_to_right_edge >> (5 + pd->subsampling_x));
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    if (xd->mb_to_bottom_edge < 0)
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      max_blocks_high += (xd->mb_to_bottom_edge >> (5 + pd->subsampling_y));
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    i = 0;
    // Unlike the normal case - in here we have to keep track of the
    // row and column of the blocks we use so that we know if we are in
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    // the unrestricted motion border.
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    for (r = 0; r < (1 << bh); r += (1 << tx_size)) {
      for (c = 0; c < (1 << bw); c += (1 << tx_size)) {
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        if (r < max_blocks_high && c < max_blocks_wide)
          visit(plane, i, bsize, txfrm_size_b, arg);
        i += step;
      }
    }
  } else {
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    const int ss_block_size = bw + bh;
    assert(txfrm_size_b <= ss_block_size);
    for (i = 0; i < (1 << ss_block_size); i += step)
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      visit(plane, i, bsize, txfrm_size_b, arg);
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  }
}

static INLINE void foreach_transformed_block(
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    const MACROBLOCKD* const xd, BLOCK_SIZE_TYPE bsize,
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    foreach_transformed_block_visitor visit, void *arg) {
  int plane;

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  for (plane = 0; plane < MAX_MB_PLANE; plane++)
    foreach_transformed_block_in_plane(xd, bsize, plane, visit, arg);
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}
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static INLINE void foreach_transformed_block_uv(
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    const MACROBLOCKD* const xd, BLOCK_SIZE_TYPE bsize,
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    foreach_transformed_block_visitor visit, void *arg) {
  int plane;

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  for (plane = 1; plane < MAX_MB_PLANE; plane++)
    foreach_transformed_block_in_plane(xd, bsize, plane, visit, arg);
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}

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// TODO(jkoleszar): In principle, pred_w, pred_h are unnecessary, as we could
// calculate the subsampled BLOCK_SIZE_TYPE, but that type isn't defined for
// sizes smaller than 16x16 yet.
typedef void (*foreach_predicted_block_visitor)(int plane, int block,
                                                BLOCK_SIZE_TYPE bsize,
                                                int pred_w, int pred_h,
                                                void *arg);
static INLINE void foreach_predicted_block_in_plane(
    const MACROBLOCKD* const xd, BLOCK_SIZE_TYPE bsize, int plane,
    foreach_predicted_block_visitor visit, void *arg) {
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  int i, x, y;
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  // block sizes in number of 4x4 blocks log 2 ("*_b")
  // 4x4=0, 8x8=2, 16x16=4, 32x32=6, 64x64=8
  // subsampled size of the block
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  const int bwl = b_width_log2(bsize) - xd->plane[plane].subsampling_x;
  const int bhl = b_height_log2(bsize) - xd->plane[plane].subsampling_y;
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  // size of the predictor to use.
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  int pred_w, pred_h;

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  if (xd->mode_info_context->mbmi.sb_type < BLOCK_8X8) {
    assert(bsize == BLOCK_8X8);
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    pred_w = 0;
    pred_h = 0;
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  } else {
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    pred_w = bwl;
    pred_h = bhl;
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  }
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  assert(pred_w <= bwl);
  assert(pred_h <= bhl);
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  // visit each subblock in raster order
  i = 0;
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  for (y = 0; y < 1 << bhl; y += 1 << pred_h) {
    for (x = 0; x < 1 << bwl; x += 1 << pred_w) {
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      visit(plane, i, bsize, pred_w, pred_h, arg);
      i += 1 << pred_w;
    }
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    i += (1 << (bwl + pred_h)) - (1 << bwl);
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  }
}
static INLINE void foreach_predicted_block(
    const MACROBLOCKD* const xd, BLOCK_SIZE_TYPE bsize,
    foreach_predicted_block_visitor visit, void *arg) {
  int plane;

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  for (plane = 0; plane < MAX_MB_PLANE; plane++)
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    foreach_predicted_block_in_plane(xd, bsize, plane, visit, arg);
}

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static int raster_block_offset(MACROBLOCKD *xd, BLOCK_SIZE_TYPE bsize,
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                               int plane, int block, int stride) {
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  const int bw = b_width_log2(bsize) - xd->plane[plane].subsampling_x;
  const int y = 4 * (block >> bw), x = 4 * (block & ((1 << bw) - 1));
  return y * stride + x;
}
static int16_t* raster_block_offset_int16(MACROBLOCKD *xd,
                                         BLOCK_SIZE_TYPE bsize,
                                         int plane, int block, int16_t *base) {
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  const int stride = plane_block_width(bsize, &xd->plane[plane]);
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  return base + raster_block_offset(xd, bsize, plane, block, stride);
}
static uint8_t* raster_block_offset_uint8(MACROBLOCKD *xd,
                                         BLOCK_SIZE_TYPE bsize,
                                         int plane, int block,
                                         uint8_t *base, int stride) {
  return base + raster_block_offset(xd, bsize, plane, block, stride);
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}
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static int txfrm_block_to_raster_block(MACROBLOCKD *xd,
                                       BLOCK_SIZE_TYPE bsize,
                                       int plane, int block,
                                       int ss_txfrm_size) {
  const int bwl = b_width_log2(bsize) - xd->plane[plane].subsampling_x;
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  const int txwl = ss_txfrm_size >> 1;
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  const int tx_cols_log2 = bwl - txwl;
  const int tx_cols = 1 << tx_cols_log2;
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  const int raster_mb = block >> ss_txfrm_size;
  const int x = (raster_mb & (tx_cols - 1)) << (txwl);
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  const int y = raster_mb >> tx_cols_log2 << (txwl);
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  return x + (y << bwl);
}

static void txfrm_block_to_raster_xy(MACROBLOCKD *xd,
                                     BLOCK_SIZE_TYPE bsize,
                                     int plane, int block,
                                     int ss_txfrm_size,
                                     int *x, int *y) {
  const int bwl = b_width_log2(bsize) - xd->plane[plane].subsampling_x;
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  const int txwl = ss_txfrm_size >> 1;
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  const int tx_cols_log2 = bwl - txwl;
  const int tx_cols = 1 << tx_cols_log2;
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  const int raster_mb = block >> ss_txfrm_size;
  *x = (raster_mb & (tx_cols - 1)) << (txwl);
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  *y = raster_mb >> tx_cols_log2 << (txwl);
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}
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static void extend_for_intra(MACROBLOCKD* const xd, int plane, int block,
                             BLOCK_SIZE_TYPE bsize, int ss_txfrm_size) {
  const int bw = plane_block_width(bsize, &xd->plane[plane]);
  const int bh = plane_block_height(bsize, &xd->plane[plane]);
  int x, y;
  txfrm_block_to_raster_xy(xd, bsize, plane, block, ss_txfrm_size, &x, &y);
  x = x * 4 - 1;
  y = y * 4 - 1;
  // Copy a pixel into the umv if we are in a situation where the block size
  // extends into the UMV.
  // TODO(JBB): Should be able to do the full extend in place so we don't have
  // to do this multiple times.
  if (xd->mb_to_right_edge < 0) {
    int umv_border_start = bw
        + (xd->mb_to_right_edge >> (3 + xd->plane[plane].subsampling_x));

    if (x + bw > umv_border_start)
      vpx_memset(
          xd->plane[plane].dst.buf + y * xd->plane[plane].dst.stride
              + umv_border_start,
          *(xd->plane[plane].dst.buf + y * xd->plane[plane].dst.stride
              + umv_border_start - 1),
          bw);
  }
  if (xd->mb_to_bottom_edge < 0) {
    int umv_border_start = bh
        + (xd->mb_to_bottom_edge >> (3 + xd->plane[plane].subsampling_y));
    int i;
    uint8_t c = *(xd->plane[plane].dst.buf
        + (umv_border_start - 1) * xd->plane[plane].dst.stride + x);

    uint8_t *d = xd->plane[plane].dst.buf
        + umv_border_start * xd->plane[plane].dst.stride + x;

    if (y + bh > umv_border_start)
      for (i = 0; i < bh; i++, d += xd->plane[plane].dst.stride)
        *d = c;
  }
}
static void set_contexts_on_border(MACROBLOCKD *xd, BLOCK_SIZE_TYPE bsize,
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                                   int plane, int tx_size_in_blocks,
                                   int eob, int aoff, int loff,
                                   ENTROPY_CONTEXT *A, ENTROPY_CONTEXT *L) {
  struct macroblockd_plane *pd = &xd->plane[plane];
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  const BLOCK_SIZE_TYPE bs = get_plane_block_size(bsize, pd);
  int mi_blocks_wide = num_4x4_blocks_wide_lookup[bs];
  int mi_blocks_high = num_4x4_blocks_high_lookup[bs];
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  int above_contexts = tx_size_in_blocks;
  int left_contexts = tx_size_in_blocks;
  int pt;

  // xd->mb_to_right_edge is in units of pixels * 8.  This converts
  // it to 4x4 block sizes.
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  if (xd->mb_to_right_edge < 0)
    mi_blocks_wide += (xd->mb_to_right_edge >> (5 + pd->subsampling_x));
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  if (xd->mb_to_bottom_edge < 0)
    mi_blocks_high += (xd->mb_to_bottom_edge >> (5 + pd->subsampling_y));

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  // this code attempts to avoid copying into contexts that are outside
  // our border.  Any blocks that do are set to 0...
  if (above_contexts + aoff > mi_blocks_wide)
    above_contexts = mi_blocks_wide - aoff;

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  if (left_contexts + loff > mi_blocks_high)
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    left_contexts = mi_blocks_high - loff;

  for (pt = 0; pt < above_contexts; pt++)
    A[pt] = eob > 0;
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  for (pt = above_contexts; pt < tx_size_in_blocks; pt++)
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    A[pt] = 0;
  for (pt = 0; pt < left_contexts; pt++)
    L[pt] = eob > 0;
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  for (pt = left_contexts; pt < tx_size_in_blocks; pt++)
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    L[pt] = 0;
}


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#endif  // VP9_COMMON_VP9_BLOCKD_H_