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|
///=============================================================================
//
// file : jpeg_dct.cpp
//
// description : Simple jpeg coding/decoding library
// Discrete Cosine Transform (8x8)
//
// project : TANGO
//
// author(s) : JL Pons
//
// Copyright (C) : 2004,2005,2006,2007,2008,2009,2010,2011,2012,2013
// European Synchrotron Radiation Facility
// BP 220, Grenoble 38043
// FRANCE
//
// This file is part of Tango.
//
// Tango is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Tango 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with Tango. If not, see <http://www.gnu.org/licenses/>.
//
// $Revision: 22213 $
//
// $Log$
// Revision 1.2 2009/04/20 14:55:58 jlpons
// Added GPL header, changed memory allocation to C++ fashion.
//
//=============================================================================
// C implementation comes from JPEG library by Thomas G. Lane
#include "jpeg_lib.h"
#define SHIFT2(x) (((x) + 2) >> 2 )
#define SHIFT11(x) (((x) + 2048) >> 11)
#define SHIFT15(x) (((x) + 32768) >> 15)
#define FIXPOINT 13
#define _1 ((long)1)
#define SCALE (_1 << FIXPOINT)
#define CLIP(x) if (x & 0xFF00) x = (((~x) >> 15) & 0xFF)
#define ROUND(x,n) (((x) + (_1 << ((n)-1))) >> (n))
#define FIX_0_298631336 ((long) 2446) /* 0.298631336 -c1+c3+c5-c7 */
#define FIX_0_390180644 ((long) 3196) /* 0.390180644 c5-c3 (neg) */
#define FIX_0_541196100 ((long) 4433) /* 0.541196100 c6 */
#define FIX_0_765366865 ((long) 6270) /* 0.765366865 c2-c6 */
#define FIX_0_899976223 ((long) 7373) /* 0.899976223 c7-c3 (neg) */
#define FIX_1_175875602 ((long) 9633) /* 1.175875602 c3 */
#define FIX_1_501321110 ((long) 12299) /* 1.501321110 c1+c3-c5-c7 */
#define FIX_1_847759065 ((long) 15137) /* 1.847759065 -c2-c6 (neg) */
#define FIX_1_961570560 ((long) 16069) /* 1.961570560 -c5-c3 (neg) */
#define FIX_2_053119869 ((long) 16819) /* 2.053119869 c1+c3-c5+c7 */
#define FIX_2_562915447 ((long) 20995) /* 2.562915447 -c1-c3 (neg) */
#define FIX_3_072711026 ((long) 25172) /* 3.072711026 c1+c3+c5-c7 */
void jpeg_fdct( short *block )
{
long tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
long tmp10, tmp11, tmp12, tmp13;
long z1, z2, z3, z4, z5;
short *dataptr;
int ctr;
// Process rows
dataptr = block;
for (ctr = 7; ctr >= 0; ctr--) {
tmp0 = (long)dataptr[0] + (long)dataptr[7];
tmp7 = (long)dataptr[0] - (long)dataptr[7];
tmp1 = (long)dataptr[1] + (long)dataptr[6];
tmp6 = (long)dataptr[1] - (long)dataptr[6];
tmp2 = (long)dataptr[2] + (long)dataptr[5];
tmp5 = (long)dataptr[2] - (long)dataptr[5];
tmp3 = (long)dataptr[3] + (long)dataptr[4];
tmp4 = (long)dataptr[3] - (long)dataptr[4];
tmp10 = tmp0 + tmp3;
tmp13 = tmp0 - tmp3;
tmp11 = tmp1 + tmp2;
tmp12 = tmp1 - tmp2;
dataptr[0] = (short) ((tmp10 + tmp11) << 2);
dataptr[4] = (short) ((tmp10 - tmp11) << 2);
z1 = (tmp12 + tmp13)*FIX_0_541196100;
dataptr[2] = (short) SHIFT11(z1 + tmp13*FIX_0_765366865);
dataptr[6] = (short) SHIFT11(z1 - tmp12*FIX_1_847759065);
z1 = tmp4 + tmp7;
z2 = tmp5 + tmp6;
z3 = tmp4 + tmp6;
z4 = tmp5 + tmp7;
z5 = (z3 + z4)*FIX_1_175875602;
tmp4 *= FIX_0_298631336;
tmp5 *= FIX_2_053119869;
tmp6 *= FIX_3_072711026;
tmp7 *= FIX_1_501321110;
z1 *= - FIX_0_899976223;
z2 *= - FIX_2_562915447;
z3 *= - FIX_1_961570560;
z4 *= - FIX_0_390180644;
z3 += z5;
z4 += z5;
dataptr[7] = (short) SHIFT11(tmp4 + z1 + z3);
dataptr[5] = (short) SHIFT11(tmp5 + z2 + z4);
dataptr[3] = (short) SHIFT11(tmp6 + z2 + z3);
dataptr[1] = (short) SHIFT11(tmp7 + z1 + z4);
dataptr += 8;
}
// Process columns
dataptr = block;
for (ctr = 7; ctr >= 0; ctr--) {
tmp0 = (long)dataptr[8*0] + (long)dataptr[8*7];
tmp7 = (long)dataptr[8*0] - (long)dataptr[8*7];
tmp1 = (long)dataptr[8*1] + (long)dataptr[8*6];
tmp6 = (long)dataptr[8*1] - (long)dataptr[8*6];
tmp2 = (long)dataptr[8*2] + (long)dataptr[8*5];
tmp5 = (long)dataptr[8*2] - (long)dataptr[8*5];
tmp3 = (long)dataptr[8*3] + (long)dataptr[8*4];
tmp4 = (long)dataptr[8*3] - (long)dataptr[8*4];
tmp10 = tmp0 + tmp3;
tmp13 = tmp0 - tmp3;
tmp11 = tmp1 + tmp2;
tmp12 = tmp1 - tmp2;
dataptr[8*0] = (short) SHIFT2(tmp10 + tmp11);
dataptr[8*4] = (short) SHIFT2(tmp10 - tmp11);
z1 = (tmp12 + tmp13)*FIX_0_541196100;
dataptr[8*2] = (short) SHIFT15(z1 + tmp13*FIX_0_765366865);
dataptr[8*6] = (short) SHIFT15(z1 - tmp12*FIX_1_847759065);
z1 = tmp4 + tmp7;
z2 = tmp5 + tmp6;
z3 = tmp4 + tmp6;
z4 = tmp5 + tmp7;
z5 = (z3 + z4)*FIX_1_175875602;
tmp4 *= FIX_0_298631336;
tmp5 *= FIX_2_053119869;
tmp6 *= FIX_3_072711026;
tmp7 *= FIX_1_501321110;
z1 *= -FIX_0_899976223;
z2 *= -FIX_2_562915447;
z3 *= -FIX_1_961570560;
z4 *= -FIX_0_390180644;
z3 += z5;
z4 += z5;
dataptr[8*7] = (short) SHIFT15(tmp4 + z1 + z3);
dataptr[8*5] = (short) SHIFT15(tmp5 + z2 + z4);
dataptr[8*3] = (short) SHIFT15(tmp6 + z2 + z3);
dataptr[8*1] = (short) SHIFT15(tmp7 + z1 + z4);
dataptr++;
}
}
// -------------------------------------------------------------
void jpeg_idct(short *block, unsigned char *dest)
{
short innerBuff[64];
long tmp0, tmp1, tmp2, tmp3;
long tmp10, tmp11, tmp12, tmp13;
long z1, z2, z3, z4, z5;
short *in,*inner;
int i;
short v;
// Rows
in = block;
inner = innerBuff;
for (i=0;i<8;i++) {
if ((in[1] | in[2] | in[3] | in[4] |
in[5] | in[6] | in[7]) == 0)
{
short dc = in[0] << 3;
inner[0] = dc;
inner[1] = dc;
inner[2] = dc;
inner[3] = dc;
inner[4] = dc;
inner[5] = dc;
inner[6] = dc;
inner[7] = dc;
in += 8;
inner += 8;
continue;
}
z2 = (long) in[2];
z3 = (long) in[6];
z1 = (z2 + z3)*FIX_0_541196100;
tmp2 = z1 + z3*(- FIX_1_847759065);
tmp3 = z1 + z2*FIX_0_765366865;
tmp0 = ((long) in[0] + (long) in[4]) << FIXPOINT;
tmp1 = ((long) in[0] - (long) in[4]) << FIXPOINT;
tmp10 = tmp0 + tmp3;
tmp13 = tmp0 - tmp3;
tmp11 = tmp1 + tmp2;
tmp12 = tmp1 - tmp2;
tmp0 = (long) in[7];
tmp1 = (long) in[5];
tmp2 = (long) in[3];
tmp3 = (long) in[1];
z1 = tmp0 + tmp3;
z2 = tmp1 + tmp2;
z3 = tmp0 + tmp2;
z4 = tmp1 + tmp3;
z5 = (z3 + z4)*FIX_1_175875602;
tmp0 = tmp0 * FIX_0_298631336;
tmp1 = tmp1 * FIX_2_053119869;
tmp2 = tmp2 * FIX_3_072711026;
tmp3 = tmp3 * FIX_1_501321110;
z1 = z1 * (-FIX_0_899976223);
z2 = z2 * (-FIX_2_562915447);
z3 = z3 * (-FIX_1_961570560);
z4 = z4 * (-FIX_0_390180644);
z3 += z5;
z4 += z5;
tmp0 += z1 + z3;
tmp1 += z2 + z4;
tmp2 += z2 + z3;
tmp3 += z1 + z4;
inner[0] = (short) ROUND(tmp10 + tmp3, FIXPOINT-3);
inner[1] = (short) ROUND(tmp11 + tmp2, FIXPOINT-3);
inner[2] = (short) ROUND(tmp12 + tmp1, FIXPOINT-3);
inner[3] = (short) ROUND(tmp13 + tmp0, FIXPOINT-3);
inner[4] = (short) ROUND(tmp13 - tmp0, FIXPOINT-3);
inner[5] = (short) ROUND(tmp12 - tmp1, FIXPOINT-3);
inner[6] = (short) ROUND(tmp11 - tmp2, FIXPOINT-3);
inner[7] = (short) ROUND(tmp10 - tmp3, FIXPOINT-3);
in += 8;
inner += 8;
}
// Columns
in = innerBuff;
for(i=0;i<8;i++)
{
if ((in[8*1] | in[8*2] | in[8*3] | in[8*4]|
in[8*5] | in[8*6] | in[8*7]) == 0)
{
short dc = (short) ROUND((long)in[0], 6) + 128;
CLIP(dc);
dest[8*0] = (unsigned char)dc;
dest[8*1] = (unsigned char)dc;
dest[8*2] = (unsigned char)dc;
dest[8*3] = (unsigned char)dc;
dest[8*4] = (unsigned char)dc;
dest[8*5] = (unsigned char)dc;
dest[8*6] = (unsigned char)dc;
dest[8*7] = (unsigned char)dc;
in++;
dest++;
continue;
}
z2 = (long) in[8*2];
z3 = (long) in[8*6];
z1 = (z2 + z3)*FIX_0_541196100;
tmp2 = z1 + z3 * (-FIX_1_847759065);
tmp3 = z1 + z2 * FIX_0_765366865;
tmp0 = ((long) in[8*0] + (long) in[8*4]) << FIXPOINT;
tmp1 = ((long) in[8*0] - (long) in[8*4]) << FIXPOINT;
tmp10 = tmp0 + tmp3;
tmp13 = tmp0 - tmp3;
tmp11 = tmp1 + tmp2;
tmp12 = tmp1 - tmp2;
tmp0 = (long) in[8*7];
tmp1 = (long) in[8*5];
tmp2 = (long) in[8*3];
tmp3 = (long) in[8*1];
z1 = tmp0 + tmp3;
z2 = tmp1 + tmp2;
z3 = tmp0 + tmp2;
z4 = tmp1 + tmp3;
z5 = (z3 + z4)*FIX_1_175875602;
tmp0 = tmp0*FIX_0_298631336;
tmp1 = tmp1*FIX_2_053119869;
tmp2 = tmp2*FIX_3_072711026;
tmp3 = tmp3*FIX_1_501321110;
z1 = z1 * (-FIX_0_899976223);
z2 = z2 * (-FIX_2_562915447);
z3 = z3 * (-FIX_1_961570560);
z4 = z4 * (-FIX_0_390180644);
z3 += z5;
z4 += z5;
tmp0 += z1 + z3;
tmp1 += z2 + z4;
tmp2 += z2 + z3;
tmp3 += z1 + z4;
v = (short) ROUND(tmp10 + tmp3, FIXPOINT+6) + 128;
CLIP(v);dest[8*0] = (unsigned char)v;
v = (short) ROUND(tmp11 + tmp2, FIXPOINT+6) + 128;
CLIP(v);dest[8*1] = (unsigned char)v;
v = (short) ROUND(tmp12 + tmp1, FIXPOINT+6) + 128;
CLIP(v);dest[8*2] = (unsigned char)v;
v = (short) ROUND(tmp13 + tmp0, FIXPOINT+6) + 128;
CLIP(v);dest[8*3] = (unsigned char)v;
v = (short) ROUND(tmp13 - tmp0, FIXPOINT+6) + 128;
CLIP(v);dest[8*4] = (unsigned char)v;
v = (short) ROUND(tmp12 - tmp1, FIXPOINT+6) + 128;
CLIP(v);dest[8*5] = (unsigned char)v;
v = (short) ROUND(tmp11 - tmp2, FIXPOINT+6) + 128;
CLIP(v);dest[8*6] = (unsigned char)v;
v = (short) ROUND(tmp10 - tmp3, FIXPOINT+6) + 128;
CLIP(v);dest[8*7] = (unsigned char)v;
dest++;
in++;
}
}
|
