libvpx/vp9/common/vp9_reconintra.c - platform/external/libvpx - Git at Google

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

 #include "./vpx_config.h"

 #include "vpx_mem/vpx_mem.h"
 #include "vpx_ports/vpx_once.h"

 #include "./vp9_rtcd.h"

 #include "vp9/common/vp9_reconintra.h"
 #include "vp9/common/vp9_onyxc_int.h"

 const TX_TYPE mode2txfm_map[MB_MODE_COUNT] = {
     DCT_DCT,    // DC
     ADST_DCT,   // V
     DCT_ADST,   // H
     DCT_DCT,    // D45
     ADST_ADST,  // D135
     ADST_DCT,   // D117
     DCT_ADST,   // D153
     DCT_ADST,   // D207
     ADST_DCT,   // D63
     ADST_ADST,  // TM
     DCT_DCT,    // NEARESTMV
     DCT_DCT,    // NEARMV
     DCT_DCT,    // ZEROMV
     DCT_DCT     // NEWMV
 };

 #define intra_pred_sized(type, size) \
   void vp9_##type##_predictor_##size##x##size##_c(uint8_t *dst, \
                                                   ptrdiff_t stride, \
                                                   const uint8_t *above, \
                                                   const uint8_t *left) { \
     type##_predictor(dst, stride, size, above, left); \
   }

 #define intra_pred_allsizes(type) \
   intra_pred_sized(type, 4) \
   intra_pred_sized(type, 8) \
   intra_pred_sized(type, 16) \
   intra_pred_sized(type, 32)

 static INLINE void d207_predictor(uint8_t *dst, ptrdiff_t stride, int bs,
                                   const uint8_t *above, const uint8_t *left) {
   int r, c;

   // first column
   for (r = 0; r < bs - 1; ++r)
     dst[r * stride] = ROUND_POWER_OF_TWO(left[r] + left[r + 1], 1);
   dst[(bs - 1) * stride] = left[bs - 1];
   dst++;

   // second column
   for (r = 0; r < bs - 2; ++r)
     dst[r * stride] = ROUND_POWER_OF_TWO(left[r] + left[r + 1] * 2 +
                                          left[r + 2], 2);
   dst[(bs - 2) * stride] = ROUND_POWER_OF_TWO(left[bs - 2] +
                                               left[bs - 1] * 3, 2);
   dst[(bs - 1) * stride] = left[bs - 1];
   dst++;

   // rest of last row
   for (c = 0; c < bs - 2; ++c)
     dst[(bs - 1) * stride + c] = left[bs - 1];

   for (r = bs - 2; r >= 0; --r)
     for (c = 0; c < bs - 2; ++c)
       dst[r * stride + c] = dst[(r + 1) * stride + c - 2];
 }
 intra_pred_allsizes(d207)

 static INLINE void d63_predictor(uint8_t *dst, ptrdiff_t stride, int bs,
                                  const uint8_t *above, const uint8_t *left) {
   int r, c;
   for (r = 0; r < bs; ++r) {
     for (c = 0; c < bs; ++c)
       dst[c] = r & 1 ? ROUND_POWER_OF_TWO(above[r/2 + c] +
                                           above[r/2 + c + 1] * 2 +
                                           above[r/2 + c + 2], 2)
                      : ROUND_POWER_OF_TWO(above[r/2 + c] +
                                           above[r/2 + c + 1], 1);
     dst += stride;
   }
 }
 intra_pred_allsizes(d63)

 static INLINE void d45_predictor(uint8_t *dst, ptrdiff_t stride, int bs,
                                  const uint8_t *above, const uint8_t *left) {
   int r, c;
   for (r = 0; r < bs; ++r) {
     for (c = 0; c < bs; ++c)
       dst[c] = r + c + 2 < bs * 2 ?  ROUND_POWER_OF_TWO(above[r + c] +
                                                         above[r + c + 1] * 2 +
                                                         above[r + c + 2], 2)
                                   : above[bs * 2 - 1];
     dst += stride;
   }
 }
 intra_pred_allsizes(d45)

 static INLINE void d117_predictor(uint8_t *dst, ptrdiff_t stride, int bs,
                                   const uint8_t *above, const uint8_t *left) {
   int r, c;

   // first row
   for (c = 0; c < bs; c++)
     dst[c] = ROUND_POWER_OF_TWO(above[c - 1] + above[c], 1);
   dst += stride;

   // second row
   dst[0] = ROUND_POWER_OF_TWO(left[0] + above[-1] * 2 + above[0], 2);
   for (c = 1; c < bs; c++)
     dst[c] = ROUND_POWER_OF_TWO(above[c - 2] + above[c - 1] * 2 + above[c], 2);
   dst += stride;

   // the rest of first col
   dst[0] = ROUND_POWER_OF_TWO(above[-1] + left[0] * 2 + left[1], 2);
   for (r = 3; r < bs; ++r)
     dst[(r - 2) * stride] = ROUND_POWER_OF_TWO(left[r - 3] + left[r - 2] * 2 +
                                                left[r - 1], 2);

   // the rest of the block
   for (r = 2; r < bs; ++r) {
     for (c = 1; c < bs; c++)
       dst[c] = dst[-2 * stride + c - 1];
     dst += stride;
   }
 }
 intra_pred_allsizes(d117)

 static INLINE void d135_predictor(uint8_t *dst, ptrdiff_t stride, int bs,
                                   const uint8_t *above, const uint8_t *left) {
   int r, c;
   dst[0] = ROUND_POWER_OF_TWO(left[0] + above[-1] * 2 + above[0], 2);
   for (c = 1; c < bs; c++)
     dst[c] = ROUND_POWER_OF_TWO(above[c - 2] + above[c - 1] * 2 + above[c], 2);

   dst[stride] = ROUND_POWER_OF_TWO(above[-1] + left[0] * 2 + left[1], 2);
   for (r = 2; r < bs; ++r)
     dst[r * stride] = ROUND_POWER_OF_TWO(left[r - 2] + left[r - 1] * 2 +
                                          left[r], 2);

   dst += stride;
   for (r = 1; r < bs; ++r) {
     for (c = 1; c < bs; c++)
       dst[c] = dst[-stride + c - 1];
     dst += stride;
   }
 }
 intra_pred_allsizes(d135)

 static INLINE void d153_predictor(uint8_t *dst, ptrdiff_t stride, int bs,
                                   const uint8_t *above, const uint8_t *left) {
   int r, c;
   dst[0] = ROUND_POWER_OF_TWO(above[-1] + left[0], 1);
   for (r = 1; r < bs; r++)
     dst[r * stride] = ROUND_POWER_OF_TWO(left[r - 1] + left[r], 1);
   dst++;

   dst[0] = ROUND_POWER_OF_TWO(left[0] + above[-1] * 2 + above[0], 2);
   dst[stride] = ROUND_POWER_OF_TWO(above[-1] + left[0] * 2 + left[1], 2);
   for (r = 2; r < bs; r++)
     dst[r * stride] = ROUND_POWER_OF_TWO(left[r - 2] + left[r - 1] * 2 +
                                          left[r], 2);
   dst++;

   for (c = 0; c < bs - 2; c++)
     dst[c] = ROUND_POWER_OF_TWO(above[c - 1] + above[c] * 2 + above[c + 1], 2);
   dst += stride;

   for (r = 1; r < bs; ++r) {
     for (c = 0; c < bs - 2; c++)
       dst[c] = dst[-stride + c - 2];
     dst += stride;
   }
 }
 intra_pred_allsizes(d153)

 static INLINE void v_predictor(uint8_t *dst, ptrdiff_t stride, int bs,
                                const uint8_t *above, const uint8_t *left) {
   int r;

   for (r = 0; r < bs; r++) {
     vpx_memcpy(dst, above, bs);
     dst += stride;
   }
 }
 intra_pred_allsizes(v)

 static INLINE void h_predictor(uint8_t *dst, ptrdiff_t stride, int bs,
                                const uint8_t *above, const uint8_t *left) {
   int r;

   for (r = 0; r < bs; r++) {
     vpx_memset(dst, left[r], bs);
     dst += stride;
   }
 }
 intra_pred_allsizes(h)

 static INLINE void tm_predictor(uint8_t *dst, ptrdiff_t stride, int bs,
                                 const uint8_t *above, const uint8_t *left) {
   int r, c;
   int ytop_left = above[-1];

   for (r = 0; r < bs; r++) {
     for (c = 0; c < bs; c++)
       dst[c] = clip_pixel(left[r] + above[c] - ytop_left);
     dst += stride;
   }
 }
 intra_pred_allsizes(tm)

 static INLINE void dc_128_predictor(uint8_t *dst, ptrdiff_t stride, int bs,
                                     const uint8_t *above, const uint8_t *left) {
   int r;

   for (r = 0; r < bs; r++) {
     vpx_memset(dst, 128, bs);
     dst += stride;
   }
 }
 intra_pred_allsizes(dc_128)

 static INLINE void dc_left_predictor(uint8_t *dst, ptrdiff_t stride, int bs,
                                      const uint8_t *above,
                                      const uint8_t *left) {
   int i, r, expected_dc, sum = 0;

   for (i = 0; i < bs; i++)
     sum += left[i];
   expected_dc = (sum + (bs >> 1)) / bs;

   for (r = 0; r < bs; r++) {
     vpx_memset(dst, expected_dc, bs);
     dst += stride;
   }
 }
 intra_pred_allsizes(dc_left)

 static INLINE void dc_top_predictor(uint8_t *dst, ptrdiff_t stride, int bs,
                                     const uint8_t *above, const uint8_t *left) {
   int i, r, expected_dc, sum = 0;

   for (i = 0; i < bs; i++)
     sum += above[i];
   expected_dc = (sum + (bs >> 1)) / bs;

   for (r = 0; r < bs; r++) {
     vpx_memset(dst, expected_dc, bs);
     dst += stride;
   }
 }
 intra_pred_allsizes(dc_top)

 static INLINE void dc_predictor(uint8_t *dst, ptrdiff_t stride, int bs,
                                 const uint8_t *above, const uint8_t *left) {
   int i, r, expected_dc, sum = 0;
   const int count = 2 * bs;

   for (i = 0; i < bs; i++) {
     sum += above[i];
     sum += left[i];
   }

   expected_dc = (sum + (count >> 1)) / count;

   for (r = 0; r < bs; r++) {
     vpx_memset(dst, expected_dc, bs);
     dst += stride;
   }
 }
 intra_pred_allsizes(dc)
 #undef intra_pred_allsizes

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

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

 static void init_intra_pred_fn_ptrs(void) {
 #define intra_pred_allsizes(l, type) \
   l[0] = vp9_##type##_predictor_4x4; \
   l[1] = vp9_##type##_predictor_8x8; \
   l[2] = vp9_##type##_predictor_16x16; \
   l[3] = vp9_##type##_predictor_32x32

   intra_pred_allsizes(pred[V_PRED], v);
   intra_pred_allsizes(pred[H_PRED], h);
   intra_pred_allsizes(pred[D207_PRED], d207);
   intra_pred_allsizes(pred[D45_PRED], d45);
   intra_pred_allsizes(pred[D63_PRED], d63);
   intra_pred_allsizes(pred[D117_PRED], d117);
   intra_pred_allsizes(pred[D135_PRED], d135);
   intra_pred_allsizes(pred[D153_PRED], d153);
   intra_pred_allsizes(pred[TM_PRED], tm);

   intra_pred_allsizes(dc_pred[0][0], dc_128);
   intra_pred_allsizes(dc_pred[0][1], dc_top);
   intra_pred_allsizes(dc_pred[1][0], dc_left);
   intra_pred_allsizes(dc_pred[1][1], dc);

 #undef intra_pred_allsizes
 }

 static void build_intra_predictors(const uint8_t *ref, int ref_stride,
                                    uint8_t *dst, int dst_stride,
                                    MB_PREDICTION_MODE mode, TX_SIZE tx_size,
                                    int up_available, int left_available,
                                    int right_available) {
   int i;
   DECLARE_ALIGNED_ARRAY(16, uint8_t, left_col, 64);
   DECLARE_ALIGNED_ARRAY(16, uint8_t, above_data, 128 + 16);
   uint8_t *above_row = above_data + 16;
   const uint8_t *const_above_row = above_row;
   const int bs = 4 << tx_size;

   // 127 127 127 .. 127 127 127 127 127 127
   // 129  A   B  ..  Y   Z
   // 129  C   D  ..  W   X
   // 129  E   F  ..  U   V
   // 129  G   H  ..  S   T   T   T   T   T
   // ..

   once(init_intra_pred_fn_ptrs);

   // left
   if (left_available) {
     for (i = 0; i < bs; i++)
       left_col[i] = ref[i * ref_stride - 1];
   } else {
     vpx_memset(left_col, 129, bs);
   }

   // above
   if (up_available) {
     const uint8_t *above_ref = ref - ref_stride;
     if (bs == 4 && right_available && left_available) {
       const_above_row = above_ref;
     } else {
       vpx_memcpy(above_row, above_ref, bs);
       if (bs == 4 && right_available)
         vpx_memcpy(above_row + bs, above_ref + bs, bs);
       else
         vpx_memset(above_row + bs, above_row[bs - 1], bs);
       above_row[-1] = left_available ? above_ref[-1] : 129;
     }
   } else {
     vpx_memset(above_row, 127, bs * 2);
     above_row[-1] = 127;
   }

   // predict
   if (mode == DC_PRED) {
     dc_pred[left_available][up_available][tx_size](dst, dst_stride,
                                                    const_above_row, left_col);
   } else {
     pred[mode][tx_size](dst, dst_stride, const_above_row, left_col);
   }
 }

 void vp9_predict_intra_block(const MACROBLOCKD *xd, int block_idx, int bwl_in,
                             TX_SIZE tx_size, int mode,
                             const uint8_t *ref, int ref_stride,
                             uint8_t *dst, int dst_stride) {
   const int bwl = bwl_in - tx_size;
   const int wmask = (1 << bwl) - 1;
   const int have_top = (block_idx >> bwl) || xd->up_available;
   const int have_left = (block_idx & wmask) || xd->left_available;
   const int have_right = ((block_idx & wmask) != wmask);

   assert(bwl >= 0);
   build_intra_predictors(ref, ref_stride, dst, dst_stride, mode, tx_size,
                          have_top, have_left, have_right);
 }
	/*
	* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
	*
	* Use of this source code is governed by a BSD-style license
	* that can be found in the LICENSE file in the root of the source
	* tree. An additional intellectual property rights grant can be found
	* in the file PATENTS. All contributing project authors may
	* be found in the AUTHORS file in the root of the source tree.
	*/

	#include "./vpx_config.h"

	#include "vpx_mem/vpx_mem.h"
	#include "vpx_ports/vpx_once.h"

	#include "./vp9_rtcd.h"

	#include "vp9/common/vp9_reconintra.h"
	#include "vp9/common/vp9_onyxc_int.h"

	const TX_TYPE mode2txfm_map[MB_MODE_COUNT] = {
	DCT_DCT, // DC
	ADST_DCT, // V
	DCT_ADST, // H
	DCT_DCT, // D45
	ADST_ADST, // D135
	ADST_DCT, // D117
	DCT_ADST, // D153
	DCT_ADST, // D207
	ADST_DCT, // D63
	ADST_ADST, // TM
	DCT_DCT, // NEARESTMV
	DCT_DCT, // NEARMV
	DCT_DCT, // ZEROMV
	DCT_DCT // NEWMV
	};

	#define intra_pred_sized(type, size) \
	void vp9_##type##_predictor_##size##x##size##_c(uint8_t *dst, \
	ptrdiff_t stride, \
	const uint8_t *above, \
	const uint8_t *left) { \
	type##_predictor(dst, stride, size, above, left); \
	}

	#define intra_pred_allsizes(type) \
	intra_pred_sized(type, 4) \
	intra_pred_sized(type, 8) \
	intra_pred_sized(type, 16) \
	intra_pred_sized(type, 32)

	static INLINE void d207_predictor(uint8_t *dst, ptrdiff_t stride, int bs,
	const uint8_t above, const uint8_t left) {
	int r, c;

	// first column
	for (r = 0; r < bs - 1; ++r)
	dst[r * stride] = ROUND_POWER_OF_TWO(left[r] + left[r + 1], 1);
	dst[(bs - 1) * stride] = left[bs - 1];
	dst++;

	// second column
	for (r = 0; r < bs - 2; ++r)
	dst[r * stride] = ROUND_POWER_OF_TWO(left[r] + left[r + 1] * 2 +
	left[r + 2], 2);
	dst[(bs - 2) * stride] = ROUND_POWER_OF_TWO(left[bs - 2] +
	left[bs - 1] * 3, 2);
	dst[(bs - 1) * stride] = left[bs - 1];
	dst++;

	// rest of last row
	for (c = 0; c < bs - 2; ++c)
	dst[(bs - 1) * stride + c] = left[bs - 1];

	for (r = bs - 2; r >= 0; --r)
	for (c = 0; c < bs - 2; ++c)
	dst[r * stride + c] = dst[(r + 1) * stride + c - 2];
	}
	intra_pred_allsizes(d207)

	static INLINE void d63_predictor(uint8_t *dst, ptrdiff_t stride, int bs,
	const uint8_t above, const uint8_t left) {
	int r, c;
	for (r = 0; r < bs; ++r) {
	for (c = 0; c < bs; ++c)
	dst[c] = r & 1 ? ROUND_POWER_OF_TWO(above[r/2 + c] +
	above[r/2 + c + 1] * 2 +
	above[r/2 + c + 2], 2)
	: ROUND_POWER_OF_TWO(above[r/2 + c] +
	above[r/2 + c + 1], 1);
	dst += stride;
	}
	}
	intra_pred_allsizes(d63)

	static INLINE void d45_predictor(uint8_t *dst, ptrdiff_t stride, int bs,
	const uint8_t above, const uint8_t left) {
	int r, c;
	for (r = 0; r < bs; ++r) {
	for (c = 0; c < bs; ++c)
	dst[c] = r + c + 2 < bs * 2 ? ROUND_POWER_OF_TWO(above[r + c] +
	above[r + c + 1] * 2 +
	above[r + c + 2], 2)
	: above[bs * 2 - 1];
	dst += stride;
	}
	}
	intra_pred_allsizes(d45)

	static INLINE void d117_predictor(uint8_t *dst, ptrdiff_t stride, int bs,
	const uint8_t above, const uint8_t left) {
	int r, c;

	// first row
	for (c = 0; c < bs; c++)
	dst[c] = ROUND_POWER_OF_TWO(above[c - 1] + above[c], 1);
	dst += stride;

	// second row
	dst[0] = ROUND_POWER_OF_TWO(left[0] + above[-1] * 2 + above[0], 2);
	for (c = 1; c < bs; c++)
	dst[c] = ROUND_POWER_OF_TWO(above[c - 2] + above[c - 1] * 2 + above[c], 2);
	dst += stride;

	// the rest of first col
	dst[0] = ROUND_POWER_OF_TWO(above[-1] + left[0] * 2 + left[1], 2);
	for (r = 3; r < bs; ++r)
	dst[(r - 2) * stride] = ROUND_POWER_OF_TWO(left[r - 3] + left[r - 2] * 2 +
	left[r - 1], 2);

	// the rest of the block
	for (r = 2; r < bs; ++r) {
	for (c = 1; c < bs; c++)
	dst[c] = dst[-2 * stride + c - 1];
	dst += stride;
	}
	}
	intra_pred_allsizes(d117)

	static INLINE void d135_predictor(uint8_t *dst, ptrdiff_t stride, int bs,
	const uint8_t above, const uint8_t left) {
	int r, c;
	dst[0] = ROUND_POWER_OF_TWO(left[0] + above[-1] * 2 + above[0], 2);
	for (c = 1; c < bs; c++)
	dst[c] = ROUND_POWER_OF_TWO(above[c - 2] + above[c - 1] * 2 + above[c], 2);

	dst[stride] = ROUND_POWER_OF_TWO(above[-1] + left[0] * 2 + left[1], 2);
	for (r = 2; r < bs; ++r)
	dst[r * stride] = ROUND_POWER_OF_TWO(left[r - 2] + left[r - 1] * 2 +
	left[r], 2);

	dst += stride;
	for (r = 1; r < bs; ++r) {
	for (c = 1; c < bs; c++)
	dst[c] = dst[-stride + c - 1];
	dst += stride;
	}
	}
	intra_pred_allsizes(d135)

	static INLINE void d153_predictor(uint8_t *dst, ptrdiff_t stride, int bs,
	const uint8_t above, const uint8_t left) {
	int r, c;
	dst[0] = ROUND_POWER_OF_TWO(above[-1] + left[0], 1);
	for (r = 1; r < bs; r++)
	dst[r * stride] = ROUND_POWER_OF_TWO(left[r - 1] + left[r], 1);
	dst++;

	dst[0] = ROUND_POWER_OF_TWO(left[0] + above[-1] * 2 + above[0], 2);
	dst[stride] = ROUND_POWER_OF_TWO(above[-1] + left[0] * 2 + left[1], 2);
	for (r = 2; r < bs; r++)
	dst[r * stride] = ROUND_POWER_OF_TWO(left[r - 2] + left[r - 1] * 2 +
	left[r], 2);
	dst++;

	for (c = 0; c < bs - 2; c++)
	dst[c] = ROUND_POWER_OF_TWO(above[c - 1] + above[c] * 2 + above[c + 1], 2);
	dst += stride;

	for (r = 1; r < bs; ++r) {
	for (c = 0; c < bs - 2; c++)
	dst[c] = dst[-stride + c - 2];
	dst += stride;
	}
	}
	intra_pred_allsizes(d153)

	static INLINE void v_predictor(uint8_t *dst, ptrdiff_t stride, int bs,
	const uint8_t above, const uint8_t left) {
	int r;

	for (r = 0; r < bs; r++) {
	vpx_memcpy(dst, above, bs);
	dst += stride;
	}
	}
	intra_pred_allsizes(v)

	static INLINE void h_predictor(uint8_t *dst, ptrdiff_t stride, int bs,
	const uint8_t above, const uint8_t left) {
	int r;

	for (r = 0; r < bs; r++) {
	vpx_memset(dst, left[r], bs);
	dst += stride;
	}
	}
	intra_pred_allsizes(h)

	static INLINE void tm_predictor(uint8_t *dst, ptrdiff_t stride, int bs,
	const uint8_t above, const uint8_t left) {
	int r, c;
	int ytop_left = above[-1];

	for (r = 0; r < bs; r++) {
	for (c = 0; c < bs; c++)
	dst[c] = clip_pixel(left[r] + above[c] - ytop_left);
	dst += stride;
	}
	}
	intra_pred_allsizes(tm)

	static INLINE void dc_128_predictor(uint8_t *dst, ptrdiff_t stride, int bs,
	const uint8_t above, const uint8_t left) {
	int r;

	for (r = 0; r < bs; r++) {
	vpx_memset(dst, 128, bs);
	dst += stride;
	}
	}
	intra_pred_allsizes(dc_128)

	static INLINE void dc_left_predictor(uint8_t *dst, ptrdiff_t stride, int bs,
	const uint8_t *above,
	const uint8_t *left) {
	int i, r, expected_dc, sum = 0;

	for (i = 0; i < bs; i++)
	sum += left[i];
	expected_dc = (sum + (bs >> 1)) / bs;

	for (r = 0; r < bs; r++) {
	vpx_memset(dst, expected_dc, bs);
	dst += stride;
	}
	}
	intra_pred_allsizes(dc_left)

	static INLINE void dc_top_predictor(uint8_t *dst, ptrdiff_t stride, int bs,
	const uint8_t above, const uint8_t left) {
	int i, r, expected_dc, sum = 0;

	for (i = 0; i < bs; i++)
	sum += above[i];
	expected_dc = (sum + (bs >> 1)) / bs;

	for (r = 0; r < bs; r++) {
	vpx_memset(dst, expected_dc, bs);
	dst += stride;
	}
	}
	intra_pred_allsizes(dc_top)

	static INLINE void dc_predictor(uint8_t *dst, ptrdiff_t stride, int bs,
	const uint8_t above, const uint8_t left) {
	int i, r, expected_dc, sum = 0;
	const int count = 2 * bs;

	for (i = 0; i < bs; i++) {
	sum += above[i];
	sum += left[i];
	}

	expected_dc = (sum + (count >> 1)) / count;

	for (r = 0; r < bs; r++) {
	vpx_memset(dst, expected_dc, bs);
	dst += stride;
	}
	}
	intra_pred_allsizes(dc)
	#undef intra_pred_allsizes

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

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

	static void init_intra_pred_fn_ptrs(void) {
	#define intra_pred_allsizes(l, type) \
	l[0] = vp9_##type##_predictor_4x4; \
	l[1] = vp9_##type##_predictor_8x8; \
	l[2] = vp9_##type##_predictor_16x16; \
	l[3] = vp9_##type##_predictor_32x32

	intra_pred_allsizes(pred[V_PRED], v);
	intra_pred_allsizes(pred[H_PRED], h);
	intra_pred_allsizes(pred[D207_PRED], d207);
	intra_pred_allsizes(pred[D45_PRED], d45);
	intra_pred_allsizes(pred[D63_PRED], d63);
	intra_pred_allsizes(pred[D117_PRED], d117);
	intra_pred_allsizes(pred[D135_PRED], d135);
	intra_pred_allsizes(pred[D153_PRED], d153);
	intra_pred_allsizes(pred[TM_PRED], tm);

	intra_pred_allsizes(dc_pred[0][0], dc_128);
	intra_pred_allsizes(dc_pred[0][1], dc_top);
	intra_pred_allsizes(dc_pred[1][0], dc_left);
	intra_pred_allsizes(dc_pred[1][1], dc);

	#undef intra_pred_allsizes
	}

	static void build_intra_predictors(const uint8_t *ref, int ref_stride,
	uint8_t *dst, int dst_stride,
	MB_PREDICTION_MODE mode, TX_SIZE tx_size,
	int up_available, int left_available,
	int right_available) {
	int i;
	DECLARE_ALIGNED_ARRAY(16, uint8_t, left_col, 64);
	DECLARE_ALIGNED_ARRAY(16, uint8_t, above_data, 128 + 16);
	uint8_t *above_row = above_data + 16;
	const uint8_t *const_above_row = above_row;
	const int bs = 4 << tx_size;

	// 127 127 127 .. 127 127 127 127 127 127
	// 129 A B .. Y Z
	// 129 C D .. W X
	// 129 E F .. U V
	// 129 G H .. S T T T T T
	// ..

	once(init_intra_pred_fn_ptrs);

	// left
	if (left_available) {
	for (i = 0; i < bs; i++)
	left_col[i] = ref[i * ref_stride - 1];
	} else {
	vpx_memset(left_col, 129, bs);
	}

	// above
	if (up_available) {
	const uint8_t *above_ref = ref - ref_stride;
	if (bs == 4 && right_available && left_available) {
	const_above_row = above_ref;
	} else {
	vpx_memcpy(above_row, above_ref, bs);
	if (bs == 4 && right_available)
	vpx_memcpy(above_row + bs, above_ref + bs, bs);
	else
	vpx_memset(above_row + bs, above_row[bs - 1], bs);
	above_row[-1] = left_available ? above_ref[-1] : 129;
	}
	} else {
	vpx_memset(above_row, 127, bs * 2);
	above_row[-1] = 127;
	}

	// predict
	if (mode == DC_PRED) {
	dc_pred[left_available][up_available][tx_size](dst, dst_stride,
	const_above_row, left_col);
	} else {
	pred[mode][tx_size](dst, dst_stride, const_above_row, left_col);
	}
	}

	void vp9_predict_intra_block(const MACROBLOCKD *xd, int block_idx, int bwl_in,
	TX_SIZE tx_size, int mode,
	const uint8_t *ref, int ref_stride,
	uint8_t *dst, int dst_stride) {
	const int bwl = bwl_in - tx_size;
	const int wmask = (1 << bwl) - 1;
	const int have_top = (block_idx >> bwl) \|\| xd->up_available;
	const int have_left = (block_idx & wmask) \|\| xd->left_available;
	const int have_right = ((block_idx & wmask) != wmask);

	assert(bwl >= 0);
	build_intra_predictors(ref, ref_stride, dst, dst_stride, mode, tx_size,
	have_top, have_left, have_right);
	}