ref: 4b2c2b9aa4a273a23d90ddb3bbf6dfb3482e0b8f
dir: /vp9/common/reconintra.c/
/*
* 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 <stdio.h>
#include "vpx_ports/config.h"
#include "vpx_rtcd.h"
#include "reconintra.h"
#include "vpx_mem/vpx_mem.h"
/* For skip_recon_mb(), add vp9_build_intra_predictors_mby_s(MACROBLOCKD *xd)
* and vp9_build_intra_predictors_mbuv_s(MACROBLOCKD *xd).
*/
static void d27_predictor(uint8_t *ypred_ptr, int y_stride, int n,
uint8_t *yabove_row, uint8_t *yleft_col) {
int r, c, h, w, v;
int a, b;
r = 0;
for (c = 0; c < n - 2; c++) {
if (c & 1)
a = yleft_col[r + 1];
else
a = (yleft_col[r] + yleft_col[r + 1] + 1) >> 1;
b = yabove_row[c + 2];
ypred_ptr[c] = (2 * a + (c + 1) * b + (c + 3) / 2) / (c + 3);
}
for (r = 1; r < n / 2 - 1; r++) {
for (c = 0; c < n - 2 - 2 * r; c++) {
if (c & 1)
a = yleft_col[r + 1];
else
a = (yleft_col[r] + yleft_col[r + 1] + 1) >> 1;
b = ypred_ptr[(r - 1) * y_stride + c + 2];
ypred_ptr[r * y_stride + c] = (2 * a + (c + 1) * b + (c + 3) / 2) / (c + 3);
}
}
for (; r < n - 1; ++r) {
for (c = 0; c < n; c++) {
v = (c & 1 ? yleft_col[r + 1] : (yleft_col[r] + yleft_col[r + 1] + 1) >> 1);
h = r - c / 2;
ypred_ptr[h * y_stride + c] = v;
}
}
c = 0;
r = n - 1;
ypred_ptr[r * y_stride] = (ypred_ptr[(r - 1) * y_stride] +
yleft_col[r] + 1) >> 1;
for (r = n - 2; r >= n / 2; --r) {
w = c + (n - 1 - r) * 2;
ypred_ptr[r * y_stride + w] = (ypred_ptr[(r - 1) * y_stride + w] +
ypred_ptr[r * y_stride + w - 1] + 1) >> 1;
}
for (c = 1; c < n; c++) {
for (r = n - 1; r >= n / 2 + c / 2; --r) {
w = c + (n - 1 - r) * 2;
ypred_ptr[r * y_stride + w] = (ypred_ptr[(r - 1) * y_stride + w] +
ypred_ptr[r * y_stride + w - 1] + 1) >> 1;
}
}
}
static void d63_predictor(uint8_t *ypred_ptr, int y_stride, int n,
uint8_t *yabove_row, uint8_t *yleft_col) {
int r, c, h, w, v;
int a, b;
c = 0;
for (r = 0; r < n - 2; r++) {
if (r & 1)
a = yabove_row[c + 1];
else
a = (yabove_row[c] + yabove_row[c + 1] + 1) >> 1;
b = yleft_col[r + 2];
ypred_ptr[r * y_stride] = (2 * a + (r + 1) * b + (r + 3) / 2) / (r + 3);
}
for (c = 1; c < n / 2 - 1; c++) {
for (r = 0; r < n - 2 - 2 * c; r++) {
if (r & 1)
a = yabove_row[c + 1];
else
a = (yabove_row[c] + yabove_row[c + 1] + 1) >> 1;
b = ypred_ptr[(r + 2) * y_stride + c - 1];
ypred_ptr[r * y_stride + c] = (2 * a + (c + 1) * b + (c + 3) / 2) / (c + 3);
}
}
for (; c < n - 1; ++c) {
for (r = 0; r < n; r++) {
v = (r & 1 ? yabove_row[c + 1] : (yabove_row[c] + yabove_row[c + 1] + 1) >> 1);
w = c - r / 2;
ypred_ptr[r * y_stride + w] = v;
}
}
r = 0;
c = n - 1;
ypred_ptr[c] = (ypred_ptr[(c - 1)] + yabove_row[c] + 1) >> 1;
for (c = n - 2; c >= n / 2; --c) {
h = r + (n - 1 - c) * 2;
ypred_ptr[h * y_stride + c] = (ypred_ptr[h * y_stride + c - 1] +
ypred_ptr[(h - 1) * y_stride + c] + 1) >> 1;
}
for (r = 1; r < n; r++) {
for (c = n - 1; c >= n / 2 + r / 2; --c) {
h = r + (n - 1 - c) * 2;
ypred_ptr[h * y_stride + c] = (ypred_ptr[h * y_stride + c - 1] +
ypred_ptr[(h - 1) * y_stride + c] + 1) >> 1;
}
}
}
static void d45_predictor(uint8_t *ypred_ptr, int y_stride, int n,
uint8_t *yabove_row, uint8_t *yleft_col) {
int r, c;
for (r = 0; r < n - 1; ++r) {
for (c = 0; c <= r; ++c) {
ypred_ptr[(r - c) * y_stride + c] =
(yabove_row[r + 1] * (c + 1) +
yleft_col[r + 1] * (r - c + 1) + r / 2 + 1) / (r + 2);
}
}
for (c = 0; c <= r; ++c) {
int yabove_ext = yabove_row[r]; // 2*yabove_row[r] - yabove_row[r-1];
int yleft_ext = yleft_col[r]; // 2*yleft_col[r] - yleft_col[r-1];
yabove_ext = (yabove_ext > 255 ? 255 : (yabove_ext < 0 ? 0 : yabove_ext));
yleft_ext = (yleft_ext > 255 ? 255 : (yleft_ext < 0 ? 0 : yleft_ext));
ypred_ptr[(r - c) * y_stride + c] =
(yabove_ext * (c + 1) +
yleft_ext * (r - c + 1) + r / 2 + 1) / (r + 2);
}
for (r = 1; r < n; ++r) {
for (c = n - r; c < n; ++c)
ypred_ptr[r * y_stride + c] = (ypred_ptr[(r - 1) * y_stride + c] +
ypred_ptr[r * y_stride + c - 1] + 1) >> 1;
}
}
static void d117_predictor(uint8_t *ypred_ptr, int y_stride, int n,
uint8_t *yabove_row, uint8_t *yleft_col) {
int r, c;
for (c = 0; c < n; c++)
ypred_ptr[c] = (yabove_row[c - 1] + yabove_row[c] + 1) >> 1;
ypred_ptr += y_stride;
for (c = 0; c < n; c++)
ypred_ptr[c] = yabove_row[c - 1];
ypred_ptr += y_stride;
for (r = 2; r < n; ++r) {
ypred_ptr[0] = yleft_col[r - 2];
for (c = 1; c < n; c++)
ypred_ptr[c] = ypred_ptr[-2 * y_stride + c - 1];
ypred_ptr += y_stride;
}
}
static void d135_predictor(uint8_t *ypred_ptr, int y_stride, int n,
uint8_t *yabove_row, uint8_t *yleft_col) {
int r, c;
ypred_ptr[0] = yabove_row[-1];
for (c = 1; c < n; c++)
ypred_ptr[c] = yabove_row[c - 1];
for (r = 1; r < n; ++r)
ypred_ptr[r * y_stride] = yleft_col[r - 1];
ypred_ptr += y_stride;
for (r = 1; r < n; ++r) {
for (c = 1; c < n; c++) {
ypred_ptr[c] = ypred_ptr[-y_stride + c - 1];
}
ypred_ptr += y_stride;
}
}
static void d153_predictor(uint8_t *ypred_ptr, int y_stride, int n,
uint8_t *yabove_row, uint8_t *yleft_col) {
int r, c;
ypred_ptr[0] = (yabove_row[-1] + yleft_col[0] + 1) >> 1;
for (r = 1; r < n; r++)
ypred_ptr[r * y_stride] = (yleft_col[r - 1] + yleft_col[r] + 1) >> 1;
ypred_ptr++;
ypred_ptr[0] = yabove_row[-1];
for (r = 1; r < n; r++)
ypred_ptr[r * y_stride] = yleft_col[r - 1];
ypred_ptr++;
for (c = 0; c < n - 2; c++)
ypred_ptr[c] = yabove_row[c];
ypred_ptr += y_stride;
for (r = 1; r < n; ++r) {
for (c = 0; c < n - 2; c++)
ypred_ptr[c] = ypred_ptr[-y_stride + c - 2];
ypred_ptr += y_stride;
}
}
void vp9_recon_intra_mbuv(MACROBLOCKD *xd) {
int i;
for (i = 16; i < 24; i += 2) {
BLOCKD *b = &xd->block[i];
vp9_recon2b(b->predictor, b->diff, *(b->base_dst) + b->dst, b->dst_stride);
}
}
void vp9_build_intra_predictors_internal(unsigned char *src, int src_stride,
unsigned char *ypred_ptr,
int y_stride, int mode, int bsize,
int up_available, int left_available) {
unsigned char *yabove_row = src - src_stride;
unsigned char yleft_col[32];
unsigned char ytop_left = yabove_row[-1];
int r, c, i;
for (i = 0; i < bsize; i++) {
yleft_col[i] = src[i * src_stride - 1];
}
/* for Y */
switch (mode) {
case DC_PRED: {
int expected_dc;
int i;
int shift;
int average = 0;
int log2_bsize_minus_1;
assert(bsize == 4 || bsize == 8 || bsize == 16 || bsize == 32);
if (bsize == 4) {
log2_bsize_minus_1 = 1;
} else if (bsize == 8) {
log2_bsize_minus_1 = 2;
} else if (bsize == 16) {
log2_bsize_minus_1 = 3;
} else /* bsize == 32 */ {
log2_bsize_minus_1 = 4;
}
if (up_available || left_available) {
if (up_available) {
for (i = 0; i < bsize; i++) {
average += yabove_row[i];
}
}
if (left_available) {
for (i = 0; i < bsize; i++) {
average += yleft_col[i];
}
}
shift = log2_bsize_minus_1 + up_available + left_available;
expected_dc = (average + (1 << (shift - 1))) >> shift;
} else {
expected_dc = 128;
}
for (r = 0; r < bsize; r++) {
vpx_memset(ypred_ptr, expected_dc, bsize);
ypred_ptr += y_stride;
}
}
break;
case V_PRED: {
for (r = 0; r < bsize; r++) {
memcpy(ypred_ptr, yabove_row, bsize);
ypred_ptr += y_stride;
}
}
break;
case H_PRED: {
for (r = 0; r < bsize; r++) {
vpx_memset(ypred_ptr, yleft_col[r], bsize);
ypred_ptr += y_stride;
}
}
break;
case TM_PRED: {
for (r = 0; r < bsize; r++) {
for (c = 0; c < bsize; c++) {
int pred = yleft_col[r] + yabove_row[ c] - ytop_left;
if (pred < 0)
pred = 0;
if (pred > 255)
pred = 255;
ypred_ptr[c] = pred;
}
ypred_ptr += y_stride;
}
}
break;
case D45_PRED: {
d45_predictor(ypred_ptr, y_stride, bsize, yabove_row, yleft_col);
}
break;
case D135_PRED: {
d135_predictor(ypred_ptr, y_stride, bsize, yabove_row, yleft_col);
}
break;
case D117_PRED: {
d117_predictor(ypred_ptr, y_stride, bsize, yabove_row, yleft_col);
}
break;
case D153_PRED: {
d153_predictor(ypred_ptr, y_stride, bsize, yabove_row, yleft_col);
}
break;
case D27_PRED: {
d27_predictor(ypred_ptr, y_stride, bsize, yabove_row, yleft_col);
}
break;
case D63_PRED: {
d63_predictor(ypred_ptr, y_stride, bsize, yabove_row, yleft_col);
}
break;
case I8X8_PRED:
case B_PRED:
case NEARESTMV:
case NEARMV:
case ZEROMV:
case NEWMV:
case SPLITMV:
case MB_MODE_COUNT:
break;
}
}
void vp9_build_intra_predictors_mby(MACROBLOCKD *xd) {
vp9_build_intra_predictors_internal(xd->dst.y_buffer, xd->dst.y_stride,
xd->predictor, 16,
xd->mode_info_context->mbmi.mode, 16,
xd->up_available, xd->left_available);
}
void vp9_build_intra_predictors_mby_s(MACROBLOCKD *xd) {
vp9_build_intra_predictors_internal(xd->dst.y_buffer, xd->dst.y_stride,
xd->dst.y_buffer, xd->dst.y_stride,
xd->mode_info_context->mbmi.mode, 16,
xd->up_available, xd->left_available);
}
#if CONFIG_SUPERBLOCKS
void vp9_build_intra_predictors_sby_s(MACROBLOCKD *xd) {
vp9_build_intra_predictors_internal(xd->dst.y_buffer, xd->dst.y_stride,
xd->dst.y_buffer, xd->dst.y_stride,
xd->mode_info_context->mbmi.mode, 32,
xd->up_available, xd->left_available);
}
#endif
#if CONFIG_COMP_INTRA_PRED
void vp9_build_comp_intra_predictors_mby(MACROBLOCKD *xd) {
unsigned char predictor[2][256];
int i;
vp9_build_intra_predictors_internal(xd->dst.y_buffer, xd->dst.y_stride,
predictor[0], 16,
xd->mode_info_context->mbmi.mode,
16, xd->up_available,
xd->left_available);
vp9_build_intra_predictors_internal(xd->dst.y_buffer, xd->dst.y_stride,
predictor[1], 16,
xd->mode_info_context->mbmi.second_mode,
16, xd->up_available,
xd->left_available);
for (i = 0; i < 256; i++) {
xd->predictor[i] = (predictor[0][i] + predictor[1][i] + 1) >> 1;
}
}
#endif
void vp9_build_intra_predictors_mbuv_internal(MACROBLOCKD *xd,
unsigned char *upred_ptr,
unsigned char *vpred_ptr,
int uv_stride,
int mode, int bsize) {
vp9_build_intra_predictors_internal(xd->dst.u_buffer, xd->dst.uv_stride,
upred_ptr, uv_stride, mode, bsize,
xd->up_available, xd->left_available);
vp9_build_intra_predictors_internal(xd->dst.v_buffer, xd->dst.uv_stride,
vpred_ptr, uv_stride, mode, bsize,
xd->up_available, xd->left_available);
}
void vp9_build_intra_predictors_mbuv(MACROBLOCKD *xd) {
vp9_build_intra_predictors_mbuv_internal(xd, &xd->predictor[256],
&xd->predictor[320], 8,
xd->mode_info_context->mbmi.uv_mode,
8);
}
void vp9_build_intra_predictors_mbuv_s(MACROBLOCKD *xd) {
vp9_build_intra_predictors_mbuv_internal(xd, xd->dst.u_buffer,
xd->dst.v_buffer,
xd->dst.uv_stride,
xd->mode_info_context->mbmi.uv_mode,
8);
}
#if CONFIG_SUPERBLOCKS
void vp9_build_intra_predictors_sbuv_s(MACROBLOCKD *xd) {
vp9_build_intra_predictors_mbuv_internal(xd, xd->dst.u_buffer,
xd->dst.v_buffer, xd->dst.uv_stride,
xd->mode_info_context->mbmi.uv_mode,
16);
}
#endif
#if CONFIG_COMP_INTRA_PRED
void vp9_build_comp_intra_predictors_mbuv(MACROBLOCKD *xd) {
unsigned char predictor[2][2][64];
int i;
vp9_build_intra_predictors_mbuv_internal(
xd, predictor[0][0], predictor[1][0], 8,
xd->mode_info_context->mbmi.uv_mode, 8);
vp9_build_intra_predictors_mbuv_internal(
xd, predictor[0][1], predictor[1][1], 8,
xd->mode_info_context->mbmi.second_uv_mode, 8);
for (i = 0; i < 64; i++) {
xd->predictor[256 + i] = (predictor[0][0][i] + predictor[0][1][i] + 1) >> 1;
xd->predictor[256 + 64 + i] = (predictor[1][0][i] +
predictor[1][1][i] + 1) >> 1;
}
}
#endif
void vp9_intra8x8_predict(BLOCKD *xd,
int mode,
unsigned char *predictor) {
vp9_build_intra_predictors_internal(*(xd->base_dst) + xd->dst,
xd->dst_stride, predictor, 16,
mode, 8, 1, 1);
}
#if CONFIG_COMP_INTRA_PRED
void vp9_comp_intra8x8_predict(BLOCKD *xd,
int mode, int second_mode,
unsigned char *out_predictor) {
unsigned char predictor[2][8 * 16];
int i, j;
vp9_intra8x8_predict(xd, mode, predictor[0]);
vp9_intra8x8_predict(xd, second_mode, predictor[1]);
for (i = 0; i < 8 * 16; i += 16) {
for (j = i; j < i + 8; j++) {
out_predictor[j] = (predictor[0][j] + predictor[1][j] + 1) >> 1;
}
}
}
#endif
void vp9_intra_uv4x4_predict(BLOCKD *xd,
int mode,
unsigned char *predictor) {
vp9_build_intra_predictors_internal(*(xd->base_dst) + xd->dst,
xd->dst_stride, predictor, 8,
mode, 4, 1, 1);
}
#if CONFIG_COMP_INTRA_PRED
void vp9_comp_intra_uv4x4_predict(BLOCKD *xd,
int mode, int mode2,
unsigned char *out_predictor) {
unsigned char predictor[2][8 * 4];
int i, j;
vp9_intra_uv4x4_predict(xd, mode, predictor[0]);
vp9_intra_uv4x4_predict(xd, mode2, predictor[1]);
for (i = 0; i < 4 * 8; i += 8) {
for (j = i; j < i + 4; j++) {
out_predictor[j] = (predictor[0][j] + predictor[1][j] + 1) >> 1;
}
}
}
#endif
/* TODO: try different ways of use Y-UV mode correlation
Current code assumes that a uv 4x4 block use same mode
as corresponding Y 8x8 area
*/