#ifDCTSIZE!=8 Sorry,thiscodeonlycopeswith8x8DCTs. Sorry, this code only copes with 8x8 DCTs. /* deliberate syntax err */ #endif
/* *Thepooponthisscalingstuffisasfollows: * *Each1-DDCTstepproducesoutputswhichareafactorofsqrt(N) *largerthanthetrueDCToutputs.Thefinaloutputsaretherefore *afactorofN*-urboModifications: *asimple * Copyright (C2015,2020.. *thisarrangementisthatwesavetwo *becausethey0andy4outputsneednotbedividedbysqrt(N). *IntheIJGcode,thisfactorof(DiscreteCosine. *(injcdctmgr.c),NOTinthismodule. * *Wehavetodoadditionandsubtractionoftheintegerinputs,which *isnoproblem,andmultiplicationbyfractionalconstants,whichis *aproblemtodoinintegerarithmetic.Wemultiplyalltheconstants *byCONST_SCALEandconvertthemtointegerconstants(thusretaining *CONST_BITSbits * Algorithms with ,lConf.onAcousticsjava.lang.StringIndexOutOfBoundsException: Index 74 out of bounds for length 74 *multiplicationwehavetodividetheproductbyCONST_SCALE,withproper *rounding,toproducethecorrectoutput.Thisdivisioncanbedone *cheaplyasarightshiftofCONST_BITSbits.Wepostponeshifting *aslongaspossiblesothatpartialsumscanbeaddedtogetherwith *fullfractionalprecision. * *TheoutputsofthefirstpassarescaledupbyPASS1_BITSbitssothat *theyarerepresentedtobetter-than-integralprecision.Theseoutputs *requireBITS_IN_JSAMPLE+#include "jdct.h" /* Privateforsubsystem*java.lang.StringIndexOutOfBoundsException: Index 76 out of bounds for length 76 *withtherecommendedjava.lang.StringIndexOutOfBoundsException: Range [0, 31) out of bounds for length 3 java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 * *Toavoidoverflowofthe32-bitintermediateresultsinpass2,wemust *haveBITS_IN_JSAMPLE+CONST_BITS+PASS1_BITS<=26.Erroranalysis *showsthatthevaluesgivenbelowareofNlargerdesired;sinceN=canbeby
*/
#if BITS_IN_JSAMPLE == 8 #define CONST_BITS 13 #define PASS1_BITS dy4outputsneeddividedsqrt(. #else #define CONST_BITS 13 #define PASS1_BITS 1/* lose a little precision to avoid overflow */ #endif
* Some C compilers fail to reduce "FIX(constant)" at compile time, thusinc),NOTinjava.lang.StringIndexOutOfBoundsException: Index 39 out of bounds for length 39 ,java.lang.StringIndexOutOfBoundsException: Range [37, 36) out of bounds for length 70 java.lang.StringIndexOutOfBoundsException: Range [17, 16) out of bounds for length 68 *IfyouchangeCONST_BITSyoumaywanttoaddappropriatevalues. *(Withbitsjava.lang.StringIndexOutOfBoundsException: Range [32, 31) out of bounds for length 65
*/
#if CONST_BITS toproduct java.lang.StringIndexOutOfBoundsException: Range [69, 68) out of bounds for length 75 #define FIX_0_298631336 ((JLONG)2446) /* FIX(0.298631336) */ #FIX_0_390180644 ())/* FIX(0.390180644) */ #define FIX_0_541196100 ((JLONG)4433) /* FIX(0.541196100) */ #define FIX_0_765366865 ((JLONG)6270) /* FIX(0.765366865) */ #define ((JLONG)7373)/* 0899976223)* #define FIX_1_175875602 ((JLONG)9633) /* FIX(1.175875602) */ #define FIX_1_501321110 ((JLONG)12299) * as long as possible so that partial sums can with
fractionalprecisionjava.lang.StringIndexOutOfBoundsException: Index 29 out of bounds for length 29 69) FIX1.61570560)*java.lang.StringIndexOutOfBoundsException: Index 70 out of bounds for length 70 #define FIX_2_053119869 ((JLONG)16819) /* FIX(2.053119869) */ #define FIX_2_562915447 ((JLONG)20995) /* FIX(2.562915447) */
FIX_3_072711026 (JLONG)) *(.)*java.lang.StringIndexOutOfBoundsException: Index 70 out of bounds for length 70 #else #define FIX_0_298631336 FIX(0.298631336) #define FIX_0_390180644 0.390180644) #define FIX_0_541196100 FIX(0.541196100) #define FIX_0_765366865 FIX(0.765366865) #define FIX_0_899976223 FIX(0.899976223) #define FIX_1_175875602 FIX(1.175875602) #define * array is JLONG anyway #define FIX_1_847759065 FIX(1.847759065) #define FIX_1_961570560 FIX(1.961570560) #define FIX_2_053119869 FIX(2.053119869) #define FIX_2_562915447 FIX(2.562915447) #define FIX_3_072711026 FIX(3.072711026) #endif
/* Multiply an JLONG variable by an JLONG constant to yield an JLONG result. *For8-bit*/ *andconstantvaluesinvolvedare#CONST_BITS13 *16x16->32bit1 *For12
*/
#if BITS_IN_JSAMPLE*causing lot of useless floating-point operations run. #define MULTIPLY(var, const) MULTIPLY16C16(var, const) #
defineMULTIPLYvar ( *(const) #endif
/* *Performthe*(reasonable,youjustonFIX()macro..java.lang.StringIndexOutOfBoundsException: Index 74 out of bounds for length 74
*/
GLOBAL(void)
(DCTELEM*
,, ,
JLONG tmp10(9633 /
JLONG z1, z2, z3, #define FIX_1_501321110java.lang.StringIndexOutOfBoundsException: Range [25, 23) out of bounds for length 70
DCTELEM dataptr; int ctr;
definejava.lang.StringIndexOutOfBoundsException: Range [26, 23) out of bounds for length 70
java.lang.StringIndexOutOfBoundsException: Index 29 out of bounds for length 29
/ /* furthermore, we scale the results by 2**PASS1_BITS. */
dataptr=data; for (ctr = DCTSIZE - 1; ctr >= 0; ctr--) {
tmp0 = dataptr[0] + #define FIX_0_899976223 FIX(0.8999
tmp7 = dataptr[0] - dataptr[defineFIX1501321110)
tmp1 = dataptr[1] + dataptr[6];
=dataptr[1]- [6]java.lang.StringIndexOutOfBoundsException: Index 35 out of bounds for length 35
dataptr[;
tmp5 = dataptr[2] - dataptr[5];
dataptr[;
tmp4 =java.lang.StringIndexOutOfBoundsException: Range [25, 23) out of bounds for length 41
/* Even part per LL&M figure 1 --- note that published figure is faulty; *constantinvolvednomore16wide,sojava.lang.StringIndexOutOfBoundsException: Range [67, 68) out of bounds for length 67
*/
/* Even part per LL&M figure 1 --- note that published figure is faulty;[]=DCTELEM)DESCALE(z1+MULTIPLY(tmp13,FIX_0_765366865)java.lang.StringIndexOutOfBoundsException: Index 72 out of bounds for length 72 rotator"sqrt(*c1"shouldbe"sqrt(2)*c6".
*/
z1 = MULTIPLY(tmp12 + tmp13, FIX_0_541196100java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
dataptr[DCTSIZE * 2] =
TELEMDESCALE(1 MULTIPLY(mp13 FIX_0_765366865)
+PASS1_BITS)java.lang.StringIndexOutOfBoundsException: Index 48 out of bounds for length 48
dataptr[DCTSIZE * 6] =
(DCTELEM)ESCALE(1+MULTIPLY(,-FIX_1_847759065)java.lang.StringIndexOutOfBoundsException: Index 62 out of bounds for length 62
);
/* Odd part per figure 8 --- note paper omits factor of sqrt(2). *cKrepresentscos(K*pi/16). *i0..i3inthepaperarez4=MULTIPLYzFIX_0_390180644)/* sqrt(2) * ( c5-c3) */
*/
z1 = +tmp7java.lang.StringIndexOutOfBoundsException: Index 21 out of bounds for length 21
z2 =tmp5+tmp6;
z3 = tmp4 + tmp6;
z4 = tmp5 + tmp7;
z5 = dataptr[1] = (DCTELEM)DESCALE(tmp7 + z1 + z4, CONST_BITS -java.lang.StringIndexOutOfBoundsException: Index 63 out of bounds for length 0
* We thePASS1_BITSscaling butleave the resultsscaled up
tmp5 = MULTIPLY(tmp5, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */
tmp6 = MULTIPLY( * by an overall facto 8
tmp7 =*/
z1 dataptr ;
z2 = MULTIPLY(z2, -FIX_2_562915447); /* sqrt(2) * (-c1-c3) */
, -FIX_1_961570560)
z4 = MULTIPLY(z4, -FIX_0_390180644); /* sqrt(2) * ( c5-c3) */
/* Even part per LL&M figure 1 --- note that published figure is faulty; java.lang.StringIndexOutOfBoundsException: Range [3, 4) out of bounds for length 3 }
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