/*
* Copyright © <2010>, Intel Corporation.
*
* This program is licensed under the terms and conditions of the
* Eclipse Public License (EPL), version 1.0. The full text of the EPL is at
* http://www.opensource.org/licenses/eclipse-1.0.php.
*
*/
#if !defined(__AVC_ILDB_CHROMA_CORE__) // Make sure this file is only included once
#define __AVC_ILDB_CHROMA_CORE__
////////// AVC ILDB Chroma Core /////////////////////////////////////////////////////////////////////////////////
//
// This core performs AVC U or V ILDB filtering on one horizontal edge (8 pixels) of a MB.
// If data is transposed, it can also de-block a vertical edge.
//
// Bafore calling this subroutine, caller needs to set the following parameters.
//
// - EdgeCntlMap1 // Edge control map A
// - EdgeCntlMap2 // Edge control map B
// - P_AddrReg // Src and dest address register for P pixels
// - Q_AddrReg // Src and dest address register for Q pixels
// - alpha // alpha corresponding to the edge to be filtered
// - beta // beta corresponding to the edge to be filtered
// - tc0 // tc0 corresponding to the edge to be filtered
//
// U or V:
// +----+----+----+----+
// | P1 | p0 | q0 | q1 |
// +----+----+----+----+
//
// p1 = r[P_AddrReg, 0]<16;8,2>
// p0 = r[P_AddrReg, 16]<16;8,2>
// q0 = r[Q_AddrReg, 0]<16;8,2>
// q1 = r[Q_AddrReg, 16]<16;8,2>
//
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// The region is both src and dest
// P0-P3 and Q0-Q3 should be only used if they have not been modified to new values
#undef P1
#undef P0
#undef Q0
#undef Q1
#define P1 r[P_AddrReg, 0]<16;8,2>:ub
#define P0 r[P_AddrReg, 16]<16;8,2>:ub
#define Q0 r[Q_AddrReg, 0]<16;8,2>:ub
#define Q1 r[Q_AddrReg, 16]<16;8,2>:ub
// New region as dest
#undef NewP0
#undef NewQ0
#define NewP0 r[P_AddrReg, 16]<2>:ub
#define NewQ0 r[Q_AddrReg, 0]<2>:ub
// Filter one chroma edge
FILTER_UV:
#if defined(_DEBUG)
mov (1) EntrySignatureC:w 0x1112:w
#endif
//---------- Derive filterSampleflag in AVC spec, equition (8-469) ----------
// bS is in MaskA
// Src copy of the p1, p0, q0, q1
// mov (8) p1(0)<1> r[P_AddrReg, 0]<16;8,2>:ub
// mov (8) p0(0)<1> r[P_AddrReg, 16]<16;8,2>:ub
// mov (8) q0(0)<1> r[Q_AddrReg, 0]<16;8,2>:ub
// mov (8) q1(0)<1> r[Q_AddrReg, 16]<16;8,2>:ub
// mov (1) f0.0:uw MaskA:uw
add (8) q0_p0(0)<1> Q0 -P0 // q0-p0
add (8) TempRow0(0)<1> P1 -P0 // p1-p0
add (8) TempRow1(0)<1> Q1 -Q0 // q1-q0
// Build FilterSampleFlag
// abs(q0-p0) < alpha
(f0.0) cmp.l.f0.0 (16) null:w (abs)q0_p0(0) alpha:w
// abs(p1-p0) < Beta
(f0.0) cmp.l.f0.0 (16) null:w (abs)TempRow0(0) beta:w
// abs(q1-q0) < Beta
(f0.0) cmp.l.f0.0 (16) null:w (abs)TempRow1(0) beta:w
//-----------------------------------------------------------------------------------------
// if
(f0.0) if (8) UV_ENDIF1
// For channels whose edge control map1 = 1 ---> perform de-blocking
// mov (1) f0.1:w MaskB:w {NoMask} // Now check for which algorithm to apply
(f0.1) if (8) UV_ELSE2
// For channels whose edge control map2 = 1 ---> bS = 4 algorithm
// p0' = (2*p1 + p0 + q1 + 2) >> 2
// q0' = (2*q1 + q0 + p1 + 2) >> 2
// Optimized version:
// A = (p1 + q1 + 2)
// p0' = (p0 + p1 + A) >> 2
// q0' = (q0 + q1 + A) >> 2
//------------------------------------------------------------------------------------
// p0' = (2*p1 + p0 + q1 + 2) >> 2
add (8) acc0<1>:w Q1 2:w
mac (8) acc0<1>:w P1 2:w
add (8) acc0<1>:w acc0<8;8,1>:w P0
shr.sat (8) TempRow0B(0)<2> acc0<8;8,1>:w 2:w
// q0' = (2*q1 + q0 + p1 + 2) >> 2
add (8) acc0<1>:w P1 2:w
mac (8) acc0<1>:w Q1 2:w
add (8) acc0<1>:w acc0<8;8,1>:w Q0
shr.sat (8) TempRow1B(0)<2> acc0<8;8,1>:w 2:w
mov (8) NewP0 TempRow0B(0) // p0'
mov (8) NewQ0 TempRow1B(0) // q0'
UV_ELSE2:
else (8) UV_ENDIF2
// For channels whose edge control map2 = 0 ---> bS < 4 algorithm
// Expand tc0 (tc0 has 4 bytes)
// mov (8) tc0_exp(0)<1> tc0<1;2,0>:ub {NoMask} // tc0_exp = tc0, each tc0 is duplicated 2 times for 2 adjcent pixels
mov (8) acc0<1>:w tc0<1;2,0>:ub {NoMask} // tc0_exp = tc0, each tc0 is duplicated 2 times for 2 adjcent pixels
// tc_exp = tc0_exp + 1
// add (8) tc_exp(0)<1> tc0_exp(0) 1:w
add (8) tc_exp(0)<1> acc0<8;8,1>:w 1:w
// delta = Clip3(-tc, tc, ((((q0 - p0)<<2) + (p1-q1) + 4) >> 3))
// 4 * (q0-p0) + p1 - q1 + 4
add (8) acc0<1>:w P1 4:w
mac (8) acc0<1>:w q0_p0(0) 4:w
add (8) acc0<1>:w acc0<8;8,1>:w -Q1
shr (8) TempRow0(0)<1> acc0<8;8,1>:w 3:w
// tc clip
cmp.g.f0.0 (8) null:w TempRow0(0) tc_exp(0) // Clip if > tc0
cmp.l.f0.1 (8) null:w TempRow0(0) -tc_exp(0) // Clip if < -tc0
(f0.0) mov (8) TempRow0(0)<1> tc_exp(0)
(f0.1) mov (8) TempRow0(0)<1> -tc_exp(0)
// p0' = Clip1(p0 + delta) = Clip3(0, 0xFF, p0 + delta)
add.sat (8) TempRow1B(0)<2> P0 TempRow0(0) // p0+delta
// q0' = Clip1(q0 - delta) = Clip3(0, 0xFF, q0 - delta)
add.sat (8) TempRow0B(0)<2> Q0 -TempRow0(0) // q0-delta
mov (8) NewP0 TempRow1B(0) // p0'
mov (8) NewQ0 TempRow0B(0) // q0'
endif
UV_ENDIF2:
UV_ENDIF1:
endif
RETURN
#endif // !defined(__AVC_ILDB_CHROMA_CORE__)