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/*****************************************************************************
* predict.c: h264 encoder
*****************************************************************************
* Copyright (C) 2003 Laurent Aimar
* $Id: predict.c,v 1.1 2003/11/09 23:25:04 fenrir Exp $
*
* Authors: Laurent Aimar <fenrir@via.ecp.fr>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
*****************************************************************************/

/* XXX predict4x4 are inspired from ffmpeg h264 decoder
*/

#include <stdlib.h>
#include <string.h>
#include <stdint.h>

#include "predict.h"

#define X264_CLIP3(a,b,c) ( (a)<(b)?(b):( (a)>(c)?(c):(a)) )

/****************************************************************************
* 16x16 prediction for intra block DC, H, V, P
****************************************************************************/
static void predict_16x16_dc( uint8_t *src, int i_stride )
{
int dc = 0;
int i, j;

/* calculate DC value */
for( i = 0; i < 16; i++ )
{
dc += src[-1 + i * i_stride];
dc += src[i - i_stride];
}
dc = ( dc + 16 ) >> 5;

for( i = 0; i < 16; i++ )
{
for( j = 0; j < 16; j++ )
{
src[j] = dc;
}
src += i_stride;
}
}
static void predict_16x16_dc_left( uint8_t *src, int i_stride )
{
int dc = 0;
int i,j;

for( i = 0; i < 16; i++ )
{
dc += src[-1 + i * i_stride];
}
dc = ( dc + 8 ) >> 4;

for( i = 0; i < 16; i++ )
{
for( j = 0; j < 16; j++ )
{
src[j] = dc;
}
src += i_stride;
}
}
static void predict_16x16_dc_top( uint8_t *src, int i_stride )
{
int dc = 0;
int i,j;

for( i = 0; i < 16; i++ )
{
dc += src[i - i_stride];
}
dc = ( dc + 8 ) >> 4;

for( i = 0; i < 16; i++ )
{
for( j = 0; j < 16; j++ )
{
src[j] = dc;
}
src += i_stride;
}
}
static void predict_16x16_dc_128( uint8_t *src, int i_stride )
{
int i,j;

for( i = 0; i < 16; i++ )
{
for( j = 0; j < 16; j++ )
{
src[j] = 128;
}
src += i_stride;
}
}
static void predict_16x16_h( uint8_t *src, int i_stride )
{
int i,j;

for( i = 0; i < 16; i++ )
{
uint8_t v;

v = src[-1];
for( j = 0; j < 16; j++ )
{
src[j] = v;
}
src += i_stride;

}
}
static void predict_16x16_v( uint8_t *src, int i_stride )
{
int i,j;

for( i = 0; i < 16; i++ )
{
for( j = 0; j < 16; j++ )
{
src[i * i_stride +j] = src[j - i_stride];
}
}
}
static void predict_16x16_p( uint8_t *src, int i_stride )
{
int x, y, i;
int a, b, c;
int H = 0;
int V = 0;
int i00;

/* calcule H and V */
for( i = 0; i <= 7; i++ )
{
H += ( i + 1 ) * ( src[ 8 + i - i_stride ] - src[6 -i -i_stride] );
V += ( i + 1 ) * ( src[-1 + (8+i)*i_stride] - src[-1 + (6-i)*i_stride] );
}

a = 16 * ( src[-1 + 15*i_stride] + src[15 - i_stride] );
b = ( 5 * H + 32 ) >> 6;
c = ( 5 * V + 32 ) >> 6;

i00 = a - b * 7 - c * 7 + 16;

for( y = 0; y < 16; y++ )
{
for( x = 0; x < 16; x++ )
{
int pix;

pix = (i00+b*x)>>5;

src[x] = X264_CLIP3( pix, 0, 255 );
}
src += i_stride;
i00 += c;
}
}


/****************************************************************************
* 8x8 prediction for intra chroma block DC, H, V, P
****************************************************************************/
static void predict_8x8_dc_128( uint8_t *src, int i_stride )
{
int x,y;

for( y = 0; y < 8; y++ )
{
for( x = 0; x < 8; x++ )
{
src[x] = 128;
}
src += i_stride;
}
}
static void predict_8x8_dc_left( uint8_t *src, int i_stride )
{
int x,y;
int dc0 = 0, dc1 = 0;

for( y = 0; y < 4; y++ )
{
dc0 += src[y * i_stride - 1];
dc1 += src[(y+4) * i_stride - 1];
}
dc0 = ( dc0 + 2 ) >> 2;
dc1 = ( dc1 + 2 ) >> 2;

for( y = 0; y < 4; y++ )
{
for( x = 0; x < 8; x++ )
{
src[ x] = dc0;
src[4*i_stride+x] = dc1;
}
src += i_stride;
}
}
static void predict_8x8_dc_top( uint8_t *src, int i_stride )
{
int x,y;
int dc0 = 0, dc1 = 0;

for( x = 0; x < 4; x++ )
{
dc0 += src[x - i_stride];
dc1 += src[x + 4 - i_stride];
}
dc0 = ( dc0 + 2 ) >> 2;
dc1 = ( dc1 + 2 ) >> 2;

for( y = 0; y < 8; y++ )
{
for( x = 0; x < 4; x++ )
{
src[x ] = dc0;
src[x + 4] = dc1;
}
src += i_stride;
}
}
static void predict_8x8_dc( uint8_t *src, int i_stride )
{
int x,y;
int s0 = 0, s1 = 0, s2 = 0, s3 = 0;
int dc0, dc1, dc2, dc3;
int i;

/* First do :
s0 s1
s2
s3
*/
for( i = 0; i < 4; i++ )
{
s0 += src[i - i_stride];
s1 += src[i + 4 - i_stride];
s2 += src[-1 + i * i_stride];
s3 += src[-1 + (i+4)*i_stride];
}
/* now calculate
dc0 dc1
dc2 dc3
*/
dc0 = ( s0 + s2 + 4 ) >> 3;
dc1 = ( s1 + 2 ) >> 2;
dc2 = ( s3 + 2 ) >> 2;
dc3 = ( s1 + s3 + 4 ) >> 3;

for( y = 0; y < 4; y++ )
{
for( x = 0; x < 4; x++ )
{
src[ x ] = dc0;
src[ x + 4] = dc1;
src[4*i_stride + x ] = dc2;
src[4*i_stride + x + 4] = dc3;
}
src += i_stride;
}
}

static void predict_8x8_h( uint8_t *src, int i_stride )
{
int i,j;

for( i = 0; i < 8; i++ )
{
uint8_t v;

v = src[-1];

for( j = 0; j < 8; j++ )
{
src[j] = v;
}
src += i_stride;
}
}
static void predict_8x8_v( uint8_t *src, int i_stride )
{
int i,j;

for( i = 0; i < 8; i++ )
{
for( j = 0; j < 8; j++ )
{
src[i * i_stride +j] = src[j - i_stride];
}
}
}

static void predict_8x8_p( uint8_t *src, int i_stride )
{
int i;
int x,y;
int a, b, c;
int H = 0;
int V = 0;
int i00;

for( i = 0; i < 4; i++ )
{
H += ( i + 1 ) * ( src[4+i - i_stride] - src[2 - i -i_stride] );
V += ( i + 1 ) * ( src[-1 +(i+4)*i_stride] - src[-1+(2-i)*i_stride] );
}

a = 16 * ( src[-1+7*i_stride] + src[7 - i_stride] );
b = ( 17 * H + 16 ) >> 5;
c = ( 17 * V + 16 ) >> 5;
i00 = a -3*b -3*c + 16;

for( y = 0; y < 8; y++ )
{
for( x = 0; x < 8; x++ )
{
int pix;

pix = (i00 +b*x) >> 5;
src[x] = X264_CLIP3( pix, 0, 255 );
}
src += i_stride;
i00 += c;
}
}

/****************************************************************************
* 4x4 prediction for intra luma block DC, H, V, P
****************************************************************************/
static void predict_4x4_dc_128( uint8_t *src, int i_stride )
{
int x,y;
for( y = 0; y < 4; y++ )
{
for( x = 0; x < 4; x++ )
{
src[x] = 128;
}
src += i_stride;
}
}
static void predict_4x4_dc_left( uint8_t *src, int i_stride )
{
int x,y;
int dc = ( src[-1+0*i_stride] + src[-1+i_stride]+
src[-1+2*i_stride] + src[-1+3*i_stride] + 2 ) >> 2;

for( y = 0; y < 4; y++ )
{
for( x = 0; x < 4; x++ )
{
src[x] = dc;
}
src += i_stride;
}
}
static void predict_4x4_dc_top( uint8_t *src, int i_stride )
{
int x,y;
int dc = ( src[0 - i_stride] + src[1 - i_stride] +
src[2 - i_stride] + src[3 - i_stride] + 2 ) >> 2;

for( y = 0; y < 4; y++ )
{
for( x = 0; x < 4; x++ )
{
src[x] = dc;
}
src += i_stride;
}
}
static void predict_4x4_dc( uint8_t *src, int i_stride )
{
int x,y;
int dc = ( src[-1+0*i_stride] + src[-1+i_stride]+
src[-1+2*i_stride] + src[-1+3*i_stride] +
src[0 - i_stride] + src[1 - i_stride] +
src[2 - i_stride] + src[3 - i_stride] + 4 ) >> 3;

for( y = 0; y < 4; y++ )
{
for( x = 0; x < 4; x++ )
{
src[x] = dc;
}
src += i_stride;
}
}
static void predict_4x4_h( uint8_t *src, int i_stride )
{
int i,j;

for( i = 0; i < 4; i++ )
{
uint8_t v;

v = src[-1];

for( j = 0; j < 4; j++ )
{
src[j] = v;
}
src += i_stride;
}
}
static void predict_4x4_v( uint8_t *src, int i_stride )
{
int i,j;

for( i = 0; i < 4; i++ )
{
for( j = 0; j < 4; j++ )
{
src[i * i_stride +j] = src[j - i_stride];
}
}
}

#define PREDICT_4x4_LOAD_LEFT \
const int l0 = src[-1+0*i_stride]; \
const int l1 = src[-1+1*i_stride]; \
const int l2 = src[-1+2*i_stride]; \
const int l3 = src[-1+3*i_stride];

#define PREDICT_4x4_LOAD_TOP \
const int t0 = src[0-1*i_stride]; \
const int t1 = src[1-1*i_stride]; \
const int t2 = src[2-1*i_stride]; \
const int t3 = src[3-1*i_stride];

#define PREDICT_4x4_LOAD_TOP_RIGHT \
const int t4 = src[4-1*i_stride]; \
const int t5 = src[5-1*i_stride]; \
const int t6 = src[6-1*i_stride]; \
const int t7 = src[7-1*i_stride];


static void predict_4x4_ddl( uint8_t *src, int i_stride )
{
PREDICT_4x4_LOAD_TOP
PREDICT_4x4_LOAD_TOP_RIGHT

src[0*i_stride+0] = ( t0 + 2*t1+ t2 + 2 ) >> 2;

src[0*i_stride+1] =
src[1*i_stride+0] = ( t1 + 2*t2+ t3 + 2 ) >> 2;

src[0*i_stride+2] =
src[1*i_stride+1] =
src[2*i_stride+0] = ( t2 + 2*t3+ t4 + 2 ) >> 2;

src[0*i_stride+3] =
src[1*i_stride+2] =
src[2*i_stride+1] =
src[3*i_stride+0] = ( t3 + 2*t4+ t5 + 2 ) >> 2;

src[1*i_stride+3] =
src[2*i_stride+2] =
src[3*i_stride+1] = ( t4 + 2*t5+ t6 + 2 ) >> 2;

src[2*i_stride+3] =
src[3*i_stride+2] = ( t5 + 2*t6+ t7 + 2 ) >> 2;

src[3*i_stride+3] = ( t6 + 3 * t7 + 2 ) >> 2;
}
static void predict_4x4_ddr( uint8_t *src, int i_stride )
{
const int lt = src[-1-i_stride];
PREDICT_4x4_LOAD_LEFT
PREDICT_4x4_LOAD_TOP

src[0*i_stride+0] =
src[1*i_stride+1] =
src[2*i_stride+2] =
src[3*i_stride+3] = ( t0 + 2*lt +l0 + 2 ) >> 2;

src[0*i_stride+1] =
src[1*i_stride+2] =
src[2*i_stride+3] = ( lt + 2 * t0 + t1 + 2 ) >> 2;

src[0*i_stride+2] =
src[1*i_stride+3] = ( t0 + 2 * t1 + t2 + 2 ) >> 2;

src[0*i_stride+3] = ( t1 + 2 * t2 + t3 + 2 ) >> 2;

src[1*i_stride+0] =
src[2*i_stride+1] =
src[3*i_stride+2] = ( lt + 2 * l0 + l1 + 2 ) >> 2;

src[2*i_stride+0] =
src[3*i_stride+1] = ( l0 + 2 * l1 + l2 + 2 ) >> 2;

src[3*i_stride+0] = ( l1 + 2 * l2 + l3 + 2 ) >> 2;
}

static void predict_4x4_vr( uint8_t *src, int i_stride )
{
const int lt = src[-1-i_stride];
PREDICT_4x4_LOAD_LEFT
PREDICT_4x4_LOAD_TOP
/* produce warning as l3 is unused */

src[0*i_stride+0]=
src[2*i_stride+1]= ( lt + t0 + 1 ) >> 1;

src[0*i_stride+1]=
src[2*i_stride+2]= ( t0 + t1 + 1 ) >> 1;

src[0*i_stride+2]=
src[2*i_stride+3]= ( t1 + t2 + 1 ) >> 1;

src[0*i_stride+3]= ( t2 + t3 + 1 ) >> 1;

src[1*i_stride+0]=
src[3*i_stride+1]= ( l0 + 2 * lt + t0 + 2 ) >> 2;

src[1*i_stride+1]=
src[3*i_stride+2]= ( lt + 2 * t0 + t1 + 2 ) >> 2;

src[1*i_stride+2]=
src[3*i_stride+3]= ( t0 + 2 * t1 + t2 + 2) >> 2;

src[1*i_stride+3]= ( t1 + 2 * t2 + t3 + 2 ) >> 2;
src[2*i_stride+0]= ( lt + 2 * l0 + l1 + 2 ) >> 2;
src[3*i_stride+0]= ( l0 + 2 * l1 + l2 + 2 ) >> 2;
}

static void predict_4x4_hd( uint8_t *src, int i_stride )
{
const int lt= src[-1-1*i_stride];
PREDICT_4x4_LOAD_LEFT
PREDICT_4x4_LOAD_TOP
/* produce warning as t3 is unused */

src[0*i_stride+0]=
src[1*i_stride+2]= ( lt + l0 + 1 ) >> 1;
src[0*i_stride+1]=
src[1*i_stride+3]= ( l0 + 2 * lt + t0 + 2 ) >> 2;
src[0*i_stride+2]= ( lt + 2 * t0 + t1 + 2 ) >> 2;
src[0*i_stride+3]= ( t0 + 2 * t1 + t2 + 2 ) >> 2;
src[1*i_stride+0]=
src[2*i_stride+2]= ( l0 + l1 + 1 ) >> 1;
src[1*i_stride+1]=
src[2*i_stride+3]= ( lt + 2 * l0 + l1 + 2 ) >> 2;
src[2*i_stride+0]=
src[3*i_stride+2]= ( l1 + l2+ 1 ) >> 1;
src[2*i_stride+1]=
src[3*i_stride+3]= ( l0 + 2 * l1 + l2 + 2 ) >> 2;
src[3*i_stride+0]= ( l2 + l3 + 1 ) >> 1;
src[3*i_stride+1]= ( l1 + 2 * l2 + l3 + 2 ) >> 2;
}

static void predict_4x4_vl( uint8_t *src, int i_stride )
{
PREDICT_4x4_LOAD_TOP
PREDICT_4x4_LOAD_TOP_RIGHT
/* produce warning as t7 is unused */

src[0*i_stride+0]= ( t0 + t1 + 1 ) >> 1;
src[0*i_stride+1]=
src[2*i_stride+0]= ( t1 + t2 + 1 ) >> 1;
src[0*i_stride+2]=
src[2*i_stride+1]= ( t2 + t3 + 1 ) >> 1;
src[0*i_stride+3]=
src[2*i_stride+2]= ( t3 + t4+ 1 ) >> 1;
src[2*i_stride+3]= ( t4 + t5+ 1 ) >> 1;
src[1*i_stride+0]= ( t0 + 2 * t1 + t2 + 2 ) >> 2;
src[1*i_stride+1]=
src[3*i_stride+0]= ( t1 + 2 * t2 + t3 + 2 ) >> 2;
src[1*i_stride+2]=
src[3*i_stride+1]= ( t2 + 2 * t3 + t4 + 2 ) >> 2;
src[1*i_stride+3]=
src[3*i_stride+2]= ( t3 + 2 * t4 + t5 + 2 ) >> 2;
src[3*i_stride+3]= ( t4 + 2 * t5 + t6 + 2 ) >> 2;
}

static void predict_4x4_hu( uint8_t *src, int i_stride )
{
PREDICT_4x4_LOAD_LEFT

src[0*i_stride+0]= ( l0 + l1 + 1 ) >> 1;
src[0*i_stride+1]= ( l0 + 2 * l1 + l2 + 2 ) >> 2;

src[0*i_stride+2]=
src[1*i_stride+0]= ( l1 + l2 + 1 ) >> 1;

src[0*i_stride+3]=
src[1*i_stride+1]= ( l1 + 2*l2 + l3 + 2 ) >> 2;

src[1*i_stride+2]=
src[2*i_stride+0]= ( l2 + l3 + 1 ) >> 1;

src[1*i_stride+3]=
src[2*i_stride+1]= ( l2 + 2 * l3 + l3 + 2 ) >> 2;

src[2*i_stride+3]=
src[3*i_stride+1]=
src[3*i_stride+0]=
src[2*i_stride+2]=
src[3*i_stride+2]=
src[3*i_stride+3]= l3;
}

/****************************************************************************
* Exported functions:
****************************************************************************/
void x264_predict_16x16_init( int cpu, x264_predict_t pf[7] )
{
pf[I_PRED_16x16_V ] = predict_16x16_v;
pf[I_PRED_16x16_H ] = predict_16x16_h;
pf[I_PRED_16x16_DC] = predict_16x16_dc;
pf[I_PRED_16x16_P ] = predict_16x16_p;
pf[I_PRED_16x16_DC_LEFT]= predict_16x16_dc_left;
pf[I_PRED_16x16_DC_TOP ]= predict_16x16_dc_top;
pf[I_PRED_16x16_DC_128 ]= predict_16x16_dc_128;
}

void x264_predict_8x8_init( int cpu, x264_predict_t pf[7] )
{
pf[I_PRED_CHROMA_V ] = predict_8x8_v;
pf[I_PRED_CHROMA_H ] = predict_8x8_h;
pf[I_PRED_CHROMA_DC] = predict_8x8_dc;
pf[I_PRED_CHROMA_P ] = predict_8x8_p;
pf[I_PRED_CHROMA_DC_LEFT]= predict_8x8_dc_left;
pf[I_PRED_CHROMA_DC_TOP ]= predict_8x8_dc_top;
pf[I_PRED_CHROMA_DC_128 ]= predict_8x8_dc_128;
}

void x264_predict_4x4_init( int cpu, x264_predict_t pf[12] )
{
pf[I_PRED_4x4_V] = predict_4x4_v;
pf[I_PRED_4x4_H] = predict_4x4_h;
pf[I_PRED_4x4_DC] = predict_4x4_dc;
pf[I_PRED_4x4_DDL] = predict_4x4_ddl;
pf[I_PRED_4x4_DDR] = predict_4x4_ddr;
pf[I_PRED_4x4_VR] = predict_4x4_vr;
pf[I_PRED_4x4_HD] = predict_4x4_hd;
pf[I_PRED_4x4_VL] = predict_4x4_vl;
pf[I_PRED_4x4_HU] = predict_4x4_hu;
pf[I_PRED_4x4_DC_LEFT]= predict_4x4_dc_left;
pf[I_PRED_4x4_DC_TOP] = predict_4x4_dc_top;
pf[I_PRED_4x4_DC_128] = predict_4x4_dc_128;
}