/*
* Copyright (c) 2010 Ixonos Plc.
* All rights reserved.
* This component and the accompanying materials are made available
* under the terms of the "Eclipse Public License v1.0"
* which accompanies this distribution, and is available
* at the URL "http://www.eclipse.org/legal/epl-v10.html".
*
* Initial Contributors:
* Nokia Corporation - Initial contribution
*
* Contributors:
* Ixonos Plc
*
* Description:
*
*/
//
// Jpeg encoder class
#include "CJpegSave.h"
#include <fbs.h>
#include <e32math.h>
const TUint8 KZigZag[] = {
0,8,1,2,9,16,24,17,
10,3,4,11,18,25,32,40,
33,26,19,12,5,6,13,20,
27,34,41,48,56,49,42,35,
28,21,14,7,15,22,29,36,
43,50,57,58,51,44,37,30,
23,31,38,45,52,59,60,53,
46,39,47,54,61,62,55,63
};
//Table K.1 from JPEG specification
const int jpeg_luma_quantizer[64] = {
16, 11, 10, 16, 24, 40, 51, 61,
12, 12, 14, 19, 26, 58, 60, 55,
14, 13, 16, 24, 40, 57, 69, 56,
14, 17, 22, 29, 51, 87, 80, 62,
18, 22, 37, 56, 68, 109, 103, 77,
24, 35, 55, 64, 81, 104, 113, 92,
49, 64, 78, 87, 103, 121, 120, 101,
72, 92, 95, 98, 112, 100, 103, 99
};
// Table K.2 from JPEG specification
const int jpeg_chroma_quantizer[64] = {
17, 18, 24, 47, 99, 99, 99, 99,
18, 21, 26, 66, 99, 99, 99, 99,
24, 26, 56, 99, 99, 99, 99, 99,
47, 66, 99, 99, 99, 99, 99, 99,
99, 99, 99, 99, 99, 99, 99, 99,
99, 99, 99, 99, 99, 99, 99, 99,
99, 99, 99, 99, 99, 99, 99, 99,
99, 99, 99, 99, 99, 99, 99, 99
};
// Set up the standard Huffman tables (cf. JPEG standard section K.3)
// IMPORTANT: these are only valid for 8-bit data precision!
const TUint8 bits_dc_luminance[17] = { 0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 };
const TUint8 val_dc_luminance[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
const TUint8 bits_dc_chrominance[17] = { 0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 };
const TUint8 val_dc_chrominance[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
const TUint8 bits_ac_luminance[17] = { 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d };
const TUint8 val_ac_luminance[] =
{
0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,
0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,
0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,
0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16,
0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,
0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,
0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,
0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,
0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,
0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,
0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
0xf9, 0xfa
};
const TUint8 bits_ac_chrominance[17] = { 0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77 };
const TUint8 val_ac_chrominance[] =
{
0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,
0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,
0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0,
0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34,
0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26,
0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38,
0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96,
0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5,
0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4,
0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3,
0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2,
0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda,
0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,
0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
0xf9, 0xfa
};
// Jpeg store huffman lookup
class TSHuffman
{
public:
TUint8 iLength[ 256 ];
TInt8 iCode[ 256 ];
};
CJpegSave* CJpegSave::NewL( RFs* aFs, RFile* aFile )
{
CJpegSave* self = NewLC( aFs, aFile );
CleanupStack::Pop( self );
return self;
}
CJpegSave* CJpegSave::NewLC( RFs* aFs, RFile* aFile )
{
CJpegSave* self = new( ELeave )CJpegSave( aFs, aFile );
CleanupStack::PushL( self );
self->ConstructL();
return self;
}
CJpegSave::~CJpegSave()
{
delete iHuffman[ 0 ];
delete iHuffman[ 1 ];
delete iHuffman[ 2 ];
delete iHuffman[ 3 ];
delete iSaveBuf;
iFs = NULL;
iSaveFile = NULL;
iCurrentHuffman = NULL;
iCurrentQuant = NULL;
}
CJpegSave::CJpegSave( RFs* aFs, RFile* aFile )
: iFs( aFs )
, iSaveFile( aFile )
{
}
void CJpegSave::ConstructL()
{
TSHuffman* huff = new( ELeave )TSHuffman;
CleanupStack::PushL(huff);
CreateHuffmanL( huff, bits_dc_luminance, val_dc_luminance );
iHuffman[ 0 ] = huff;
CleanupStack::Pop();
huff = new( ELeave )TSHuffman;
CleanupStack::PushL(huff);
CreateHuffmanL( huff, bits_dc_chrominance, val_dc_chrominance );
iHuffman[ 1 ] = huff;
CleanupStack::Pop();
huff = new( ELeave )TSHuffman;
CleanupStack::PushL(huff);
CreateHuffmanL( huff, bits_ac_luminance, val_ac_luminance );
iHuffman[ 2 ] = huff;
CleanupStack::Pop();
huff = new( ELeave )TSHuffman;
CleanupStack::PushL(huff);
CreateHuffmanL( huff, bits_ac_chrominance, val_ac_chrominance );
iHuffman[ 3 ] = huff;
CleanupStack::Pop();
iSaveByte = 0;
iSaveBufPos = 0;
iSaveBufBitPos = 0;
}
void CJpegSave::StartSaveL( const TSize& aSize, TPtr8 aExif, TInt aSaveBufferSize, TInt aQuality )
{
iSaveBufSize = aSaveBufferSize;
if (iSaveBuf)
{
delete iSaveBuf;
iSaveBuf = NULL;
}
iSaveBuf = new( ELeave )TUint8[ iSaveBufSize ];
// create quantization tables
MakeTables( aQuality, iYQuant, iUVQuant );
TSize size = aSize;
TInt len;
// D8 Start Of Image
WriteSaveBuffer( (TUint16)0xffd8 );
//
// Exif ( if any )
//
if( aExif.Length() != 0 )
{
WriteSaveBuffer( (TUint16) 0xffe1 );
TUint32 l = aExif.Length() + 6 + 2; // +header+tagsize
WriteSaveBuffer( (TUint16) l );
// exif header is 6 bytes ( 45 78 69 66 00 00 "Exif.." )
WriteSaveBuffer( (TUint8) 0x45 );
WriteSaveBuffer( (TUint8) 0x78 );
WriteSaveBuffer( (TUint8) 0x69 );
WriteSaveBuffer( (TUint8) 0x66 );
WriteSaveBuffer( (TUint8) 0x00 );
WriteSaveBuffer( (TUint8) 0x00 );
l -= ( 6+2 ); // minus header, minus tag size
// save exif chunck
WriteSaveBuffer( aExif.Ptr(), l );
}
else
{
//
// if no exif, standard application segment here
//
// E0 jpeg application segment
WriteSaveBuffer( (TUint16)0xffe0 );
// segment length
WriteSaveBuffer( (TUint16)16 );
// 0x4a, 0x46, 0x49, 0x46, 0x00 JFIF #0
WriteSaveBuffer( (TUint8) 0x4a );
WriteSaveBuffer( (TUint8) 0x46 );
WriteSaveBuffer( (TUint8) 0x49 );
WriteSaveBuffer( (TUint8) 0x46 );
WriteSaveBuffer( (TUint8) 0x00 );
WriteSaveBuffer( (TUint8) 0x01 ); // major revision number
WriteSaveBuffer( (TUint8) 0x01 ); // minor revision number
// 0=aspect ratio, 1=dots/inch, 2=dots/cm
WriteSaveBuffer( (TUint8) 0x01 );
TInt dpi = 72;
// x dpi
WriteSaveBuffer( (TUint16) dpi );
// y dpi
WriteSaveBuffer( (TUint16) dpi );
// thumbnail width
WriteSaveBuffer( (TUint8) 0 );
// thumbnail height
WriteSaveBuffer( (TUint8) 0 );
}
//
// quant table
//
TUint8 quant[ 2 ][ 64 ];
TInt i;
TInt n;
for( i=0; i<64; i++ )
{
quant[ 0 ][ i ] = iYQuant[ i ];
quant[ 1 ][ i ] = iUVQuant[ i ];
}
for( n=0; n<2; n++ )
{
WriteSaveBuffer( (TUint16) 0xffdb );
len = 2 + 1 * 65;
// chunk length
WriteSaveBuffer( (TUint16) len );
// quantization table #
WriteSaveBuffer( (TUint8) n );
// quantization table
WriteSaveBuffer( quant[ n ], 64 );
}
//
// Huffman Table
//
const TUint8* nBits[ 4 ];
const TUint8* values[ 4 ];
nBits[ 0 ] = bits_dc_luminance;
nBits[ 1 ] = bits_dc_chrominance;
nBits[ 2 ] = bits_ac_luminance;
nBits[ 3 ] = bits_ac_chrominance;
values[ 0 ] = val_dc_luminance;
values[ 1 ] = val_dc_chrominance;
values[ 2 ] = val_ac_luminance;
values[ 3 ] = val_ac_chrominance;
for( n=0; n<4; n++ )
{
WriteSaveBuffer( (TUint16) 0xffc4 );
TInt numSymbols = 0;
for( i=0; i<16; i++ )
{
TUint8 size = nBits[ n ][ i + 1 ];
numSymbols += size;
}
len = 2 + 1 + 16 + numSymbols;
// chunk length
WriteSaveBuffer( (TUint16) len );
// huffman table #
WriteSaveBuffer( (TUint8)( ( n / 2 ) * 16 + ( n & 1 ) ) );
// bit lengths for huffman table codes
for( i=0; i<16; i++ )
{
TUint8 size = nBits[ n ][ i + 1 ];
WriteSaveBuffer( size );
}
// huffman table symbols
WriteSaveBuffer( values[ n ], numSymbols );
}
//
// Start of frame
//
WriteSaveBuffer( (TUint16)0xffc0 );
len = 8 + 3 * 3;
// chunk length
WriteSaveBuffer( (TUint16)len );
// precision
WriteSaveBuffer( (TUint8)8 );
// image height
WriteSaveBuffer( (TUint16)size.iHeight );
// image width
WriteSaveBuffer( (TUint16)size.iWidth );
// number of components
WriteSaveBuffer( (TUint8)3 );
// component 0:
WriteSaveBuffer( (TUint8)1 ); // number of component
WriteSaveBuffer( (TUint8) ( 1 + 16*2 ) ); // sampling factor
WriteSaveBuffer( (TUint8)0 ); // number of quantization table
// component 1:
WriteSaveBuffer( (TUint8)2 ); // number of component
WriteSaveBuffer( (TUint8) ( 1 + 16*1 ) ); // sampling factor
WriteSaveBuffer( (TUint8)1 ); // number of quantization table
// component 2:
WriteSaveBuffer( (TUint8)3 ); // number of component
WriteSaveBuffer( (TUint8) ( 1 + 16*1 ) ); // sampling factor
WriteSaveBuffer( (TUint8)1 ); // number of quantization table
//
// Start Of Scan ( SOS )
//
WriteSaveBuffer( (TUint16)0xffda );
len = 3 + 3*2 + 3;
// chunk length
WriteSaveBuffer( (TUint16)len );
// number of components
WriteSaveBuffer( (TUint8)3 );
/// component1:
// component ID
WriteSaveBuffer( (TUint8)1 );
// component huffman table ac(low4) dc(hi4)
WriteSaveBuffer( (TUint8)0 );
/// component2:
// component ID
WriteSaveBuffer( (TUint8)2 );
// component huffman table ac(low4) dc(hi4)
WriteSaveBuffer( (TUint8)17 );
/// component3:
// component ID
WriteSaveBuffer( (TUint8)3 );
// component huffman table ac(low4) dc(hi4)
WriteSaveBuffer( (TUint8)17 );
// stuffing ( actually dctsize-1 can be stored )
WriteSaveBuffer( (TUint8)0 );
WriteSaveBuffer( (TUint8)63 ); // dctsize - 1
WriteSaveBuffer( (TUint8)0 );
iDy = 0;
iDu = 0;
iDv = 0;
}
void CJpegSave::SaveBlock( const TBitmapHandle& aBitmap )
{
//
// Macroblocks:
//
TInt by[ 256 ];
TInt bu[ 64 ];
TInt bv[ 64 ];
TInt dct[ 64 ];
Rgb2Yuv( (TUint32*)aBitmap.iData, aBitmap.iSize.iWidth, by, bu, bv );
iCurrentQuant = (TUint8*)iYQuant;
Dct( by, dct );
dct[ 0 ] -= iDy;
iDy += WriteDct( dct, iHuffman[ 0 ], iHuffman[ 2 ] );
Dct( by+64, dct );
dct[ 0 ] -= iDy;
iDy += WriteDct( dct, iHuffman[ 0 ], iHuffman[ 2 ] );
iCurrentQuant = (TUint8*)iUVQuant;
Dct( bu, dct );
dct[ 0 ] -= iDu;
iDu += WriteDct( dct, iHuffman[ 1 ], iHuffman[ 3 ] );
Dct( bv, dct );
dct[ 0 ] -= iDv;
iDv += WriteDct( dct, iHuffman[ 1 ], iHuffman[ 3 ] );
}
void CJpegSave::FinalizeSave()
{
//
// End Of Image ( EOI )
//
// flush last bits to save buffer
if( iSaveBufBitPos )
{
WriteBits( 0, 8-iSaveBufBitPos );
}
// end of image tag
WriteSaveBuffer( (TUint16)0xffd9 );
// there might still be stuff in save buffer
FlushSaveBuf();
}
TPtrC8 CJpegSave::Finalize()
{
//
// End Of Image ( EOI )
//
// flush last bits to save buffer
if( iSaveBufBitPos )
{
WriteBits( 0, 8-iSaveBufBitPos );
}
// end of image tag
WriteSaveBuffer( (TUint16)0xffd9 );
return TPtrC8( iSaveBuf, iSaveBufPos );
}
void CJpegSave::WriteHuffman( TInt aValue )
{
TInt code = iCurrentHuffman->iCode[ aValue ];
TInt len = iCurrentHuffman->iLength[ aValue ];
WriteBits( code, len );
}
void CJpegSave::CreateHuffmanL( TSHuffman* aHuffman, const TUint8* aBits, const TUint8* aVal )
{
TInt huffSize[ 16 ];
TUint32 huffCode[ 256 ];
TInt huffValue[ 256 ];
TInt huffLength[ 256 ];
TInt numSymbols = 0;
TInt i;
for( i=0; i<16; i++ )
{
TInt size = aBits[ i+1 ];
huffSize[ i ] = size;
numSymbols += size;
}
for( i=0; i<numSymbols; i++ )
{
huffValue[ i ] = aVal[ i ];
}
TInt l;
TInt p = 0;
for( i=0; i<256; i++ ) huffLength[ i ] = -1;
for( l=0; l<16; l++ )
{
for( i=0; i<huffSize[ l ]; i++ )
{
huffLength[ p++ ] = l+1;
}
}
TInt code = 0;
huffLength[ p ] = 0;
TInt si = huffLength[ 0 ];
p = 0;
while( huffLength[ p ] )
{
while( huffLength[ p ] == si )
{
huffCode[ p++ ] = code++;
}
code *= 2;
si++;
}
for( i=0; i<numSymbols; i++ )
{
TInt v = huffValue[ i ];
aHuffman->iLength[ v ] = huffLength[ i ];
aHuffman->iCode[ v ] = huffCode[ i ];
}
}
void CJpegSave::WriteBits( TUint32 aValue, TInt aNumBits )
{
aValue &= ( ( 1 << aNumBits ) - 1 );
while( aNumBits > 0 )
{
TInt bitroom = 8 - iSaveBufBitPos;
iSaveByte |= ( ( aValue << ( 24+bitroom-aNumBits ) ) >> 24 );
if( aNumBits < bitroom )
{
iSaveBufBitPos += aNumBits;
}
else
{
iSaveBufBitPos += bitroom;
}
if( iSaveBufBitPos == 8 )
{
iSaveBufBitPos = 0;
iSaveBuf[ iSaveBufPos ] = iSaveByte;
if( iSaveByte == 255 )
{
iSaveBufPos++;
if( iSaveBufPos == iSaveBufSize )
{
FlushSaveBuf();
}
iSaveBuf[ iSaveBufPos ] = 0; // 255,0 = 255 ( escaped 255 )
}
iSaveByte = 0;
iSaveBufPos++;
if( iSaveBufPos == iSaveBufSize )
{
FlushSaveBuf();
}
}
aNumBits -= bitroom;
}
}
TInt CJpegSave::WriteDct( TInt* aDct, TSHuffman* aDc, TSHuffman* aAc )
{
TInt rv = 0;
TInt nullCount = 0;
bool theEnd = false;
for( TInt i=0; i<64; i++ )
{
if( i == 0 )
{
iCurrentHuffman = aDc;
}
else
{
iCurrentHuffman = aAc;
}
TInt value = aDct[ KZigZag[ i ] ] / iCurrentQuant[ i ];
if( i==0 ) rv = value * iCurrentQuant[ 0 ];
bool doSave = true;
if( i > 0 && value == 0 )
{
if( nullCount < 14 )
{
nullCount++;
doSave = false;
}
else
{
value = 0; // end of block, too many zeros
nullCount = 0;
theEnd = true;
}
}
if( i == 63 && nullCount > 0 )
{
doSave = true;
value = 0;
nullCount = 0;
theEnd = true;
}
if( doSave )
{
bool minus = false;
if( value < 0 )
{
minus = true;
value = -value;
}
TInt v = value;
TInt vl = 0;
while( v )
{
v >>= 1;
vl++;
}
if( minus )
{
TInt a = ( 1 << vl ) - 1;
value ^= a;
}
WriteHuffman( vl + nullCount * 16 );
WriteBits( value, vl );
if( theEnd ) // this is the end
{
break;
}
nullCount = 0;
}
}
return rv;
}
void CJpegSave::Dct( TInt* aSrc, TInt* aTgt )
{
const TInt w1 = 237;
const TInt w2 = 98;
const TInt w3 = 181;
const TInt w4 = 251;
const TInt w5 = 50;
const TInt w6 = 213;
const TInt w7 = 142;
TInt s[8];
TInt t[6];
TInt r[4];
int j;
TInt* tp = aTgt;
for( j=0; j<8; j++ )
{
s[0] = aSrc[j + 0] + aSrc[j + 56];
s[1] = aSrc[j + 8] + aSrc[j + 48];
s[2] = aSrc[j + 16] + aSrc[j + 40];
s[3] = aSrc[j + 24] + aSrc[j + 32];
s[4] = aSrc[j + 24] - aSrc[j + 32];
s[5] = aSrc[j + 16] - aSrc[j + 40];
s[6] = aSrc[j + 8] - aSrc[j + 48];
s[7] = aSrc[j + 0] - aSrc[j + 56];
t[0] = s[0] + s[3];
t[1] = s[1] + s[2];
t[2] = s[1] - s[2];
t[3] = s[0] - s[3];
t[4] = (s[6] - s[5]) * w3;
t[5] = (s[6] + s[5]) * w3;
r[0] = s[4] * 256 + t[4];
r[1] = s[4] * 256 - t[4];
r[2] = s[7] * 256 - t[5];
r[3] = s[7] * 256 + t[5];
*tp++ = (t[0] + t[1]) * w3 / 256;
*tp++ = (r[0] * w5 + r[3] * w4) / 256 / 256;
*tp++ = (t[2] * w2 + t[3] * w1) / 256;
*tp++ = (r[2] * w6 - r[1] * w7) / 256 / 256;
*tp++ = (t[0] - t[1]) * w3 / 256;
*tp++ = (r[1] * w6 + r[2] * w7) / 256 / 256;
*tp++ = (t[3] * w2 - t[2] * w1) / 256;
*tp++ = (r[3] * w5 - r[0] * w4) / 256 / 256;
}
for( j=0; j<8; j++ )
{
s[0] = aTgt[j + 0] + aTgt[j + 56];
s[1] = aTgt[j + 8] + aTgt[j + 48];
s[2] = aTgt[j + 16] + aTgt[j + 40];
s[3] = aTgt[j + 24] + aTgt[j + 32];
s[4] = aTgt[j + 24] - aTgt[j + 32];
s[5] = aTgt[j + 16] - aTgt[j + 40];
s[6] = aTgt[j + 8] - aTgt[j + 48];
s[7] = aTgt[j + 0] - aTgt[j + 56];
t[0] = s[0] + s[3];
t[1] = s[1] + s[2];
t[2] = s[1] - s[2];
t[3] = s[0] - s[3];
t[4] = (s[6] - s[5]) * w3;
t[5] = (s[6] + s[5]) * w3;
r[0] = s[4] * 256 + t[4];
r[1] = s[4] * 256 - t[4];
r[2] = s[7] * 256 - t[5];
r[3] = s[7] * 256 + t[5];
aTgt[ 0 + j] = (t[0] + t[1]) * w3 / 256 / 4;
aTgt[32 + j] = (t[0] - t[1]) * w3 / 256 / 4;
aTgt[ 8 + j] = (r[0] * w5 + r[3] * w4) / 256 / 256 / 4;
aTgt[56 + j] = (r[3] * w5 - r[0] * w4) / 256 / 256 / 4;
aTgt[24 + j] = (r[2] * w6 - r[1] * w7) / 256 / 256 / 4;
aTgt[40 + j] = (r[1] * w6 + r[2] * w7) / 256 / 256 / 4;
aTgt[16 + j] = (t[2] * w2 + t[3] * w1) / 256 / 4;
aTgt[48 + j] = (t[3] * w2 - t[2] * w1) / 256 / 4;
}
}
void CJpegSave::Rgb2Yuv( TUint32* aRgb, TInt /*aWidth*/, TInt* aY, TInt* aU, TInt* aV )
{
TInt pos = 0;
TInt yy;
TInt xx;
TInt y;
for( yy=0; yy<1; yy++ )
for( xx=0; xx<2; xx++ )
for( y=0; y<8; y++ )
{
TInt cpos = xx*4 + y*8;
TInt x;
for( x=0; x<8; x++ )
{
TUint32 c = aRgb[ x + xx*8 + y*16 + yy * 128 ];
TInt r = ( c >> 16 ) & 0xff;
TInt g = ( c >> 8 ) & 0xff;
TInt b = c & 0xff;
TInt cy = ( 19595*r + 38470*g + 7471*b ) >> 16;
//TInt cy = 0.29900*r + 0.58700*g + 0.11400*b;
//if( y<0 ) cy=0;
//if( y>255 ) cy=255;
aY[ pos++ ] = cy - 128;
if( x & 1 )
{
TInt t = ( ( -11059*r - 21710*g + 32768*b ) >> 16 );
//TInt t = -0.16874*r - 0.33126*g + 0.50000*b + 128;
//if( t<-128 ) t=-128;
//if( t>127 ) t=127;
aU[ cpos ] = t;
t = ( ( 32768*r - 27439*g - 5329*b ) >> 16 );
//t = 0.50000*r - 0.41869*g - 0.08131*b + 128;
//if( t<-128 ) t=-128;
//if( t>127 ) t=127;
aV[ cpos++ ] = t;
}
}
}
// 1:1:1 macroblock version
/*
TUint32* p = aRgb;
TInt mod = ( aWidth - 8 );
TInt pos = 0;
TInt y;
for( y=0; y<8; y++ )
{
TInt x;
for( x=0; x<8; x++ )
{
TUint32 c = *p++;
TInt r = c >> 16;
TInt g = ( c >> 8 ) & 0xff;
TInt b = c & 0xff;
TInt y = ( 19595*r + 38470*g + 7471*b ) >> 16;
//TInt y = 0.29900*r + 0.58700*g + 0.11400*b;
if( y<0 ) y=0;
if( y>255 ) y=255;
aY[ pos ] = y - 128;
TInt t = ( ( -11059*r - 21710*g + 32768*b ) >> 16 );
//TInt t = -0.16874*r - 0.33126*g + 0.50000*b + 128;
if( t<-128 ) t=-128;
if( t>127 ) t=127;
aU[ pos ] = t;
t = ( ( 32768*r - 27439*g - 5329*b ) >> 16 );
//t = 0.50000*r - 0.41869*g - 0.08131*b + 128;
if( t<-128 ) t=-128;
if( t>127 ) t=127;
aV[ pos ] = t;
pos++;
}
p += mod;
}
*/
}
void CJpegSave::MakeTables( TInt aQuality, TUint8* aY, TUint8* aUV )
{
TInt i;
TInt factor = aQuality;
if( aQuality < 1 ) factor = 1;
if( aQuality > 99 ) factor = 99;
if( aQuality < 50 )
{
aQuality = 5000 / factor;
}
else
{
aQuality = 200 - factor*2;
}
for( i=0; i < 64; i++ )
{
TInt y = ( jpeg_luma_quantizer[i] * aQuality + 50) / 100;
TInt uv = ( jpeg_chroma_quantizer[i] * aQuality + 50) / 100;
if( y < 1) y = 1;
if( uv < 1) uv = 1;
if( y > 255) y = 255;
if( uv > 255) uv = 255;
aY[ i ] = y;
aUV[ i ] = uv;
}
}
void CJpegSave::WriteSaveBuffer( const TUint8* aSrc, TInt aBytes )
{
TInt pos = 0;
while( aBytes )
{
TInt bytes = aBytes;
if( iSaveBufPos + bytes > iSaveBufSize )
{
bytes = iSaveBufSize - iSaveBufPos;
}
Mem::Copy( iSaveBuf + iSaveBufPos, aSrc + pos, bytes );
iSaveBufPos += bytes;
if( iSaveBufPos == iSaveBufSize )
{
FlushSaveBuf();
}
aBytes -= bytes;
pos += bytes;
}
}
void CJpegSave::WriteSaveBuffer( TUint8 aValue )
{
iSaveBuf[ iSaveBufPos++ ] = aValue;
if( iSaveBufPos == iSaveBufSize )
{
FlushSaveBuf();
}
}
void CJpegSave::WriteSaveBuffer( TUint16 aValue )
{
WriteSaveBuffer( (TUint8) ( aValue / 256 ) );
WriteSaveBuffer( (TUint8) ( aValue & 255 ) );
}
void CJpegSave::FlushSaveBuf()
{
if( &iSaveFile == NULL ) return; // no flushing without file
TPtr8 ptr( iSaveBuf, iSaveBufPos );
ptr.SetLength( iSaveBufPos );
if( iSaveFile )iSaveFile->Write( ptr );
iSaveBufPos = 0;
}