19f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 29f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * jidctfst.c 39f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 49f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Copyright (C) 1994-1998, Thomas G. Lane. 59f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * This file is part of the Independent JPEG Group's software. 69f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * For conditions of distribution and use, see the accompanying README file. 79f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 89f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * This file contains a fast, not so accurate integer implementation of the 99f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * inverse DCT (Discrete Cosine Transform). In the IJG code, this routine 109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * must also perform dequantization of the input coefficients. 119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * A 2-D IDCT can be done by 1-D IDCT on each column followed by 1-D IDCT 139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * on each row (or vice versa, but it's more convenient to emit a row at 149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * a time). Direct algorithms are also available, but they are much more 159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * complex and seem not to be any faster when reduced to code. 169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * This implementation is based on Arai, Agui, and Nakajima's algorithm for 189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * scaled DCT. Their original paper (Trans. IEICE E-71(11):1095) is in 199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Japanese, but the algorithm is described in the Pennebaker & Mitchell 209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * JPEG textbook (see REFERENCES section in file README). The following code 219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * is based directly on figure 4-8 in P&M. 229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * While an 8-point DCT cannot be done in less than 11 multiplies, it is 239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * possible to arrange the computation so that many of the multiplies are 249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * simple scalings of the final outputs. These multiplies can then be 259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * folded into the multiplications or divisions by the JPEG quantization 269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * table entries. The AA&N method leaves only 5 multiplies and 29 adds 279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * to be done in the DCT itself. 289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * The primary disadvantage of this method is that with fixed-point math, 299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * accuracy is lost due to imprecise representation of the scaled 309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * quantization values. The smaller the quantization table entry, the less 319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * precise the scaled value, so this implementation does worse with high- 329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * quality-setting files than with low-quality ones. 339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define JPEG_INTERNALS 369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#include "jinclude.h" 379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#include "jpeglib.h" 389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#include "jdct.h" /* Private declarations for DCT subsystem */ 399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifdef DCT_IFAST_SUPPORTED 419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * This module is specialized to the case DCTSIZE = 8. 459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#if DCTSIZE != 8 489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project Sorry, this code only copes with 8x8 DCTs. /* deliberate syntax err */ 499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Scaling decisions are generally the same as in the LL&M algorithm; 539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * see jidctint.c for more details. However, we choose to descale 549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * (right shift) multiplication products as soon as they are formed, 559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * rather than carrying additional fractional bits into subsequent additions. 569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * This compromises accuracy slightly, but it lets us save a few shifts. 579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * More importantly, 16-bit arithmetic is then adequate (for 8-bit samples) 589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * everywhere except in the multiplications proper; this saves a good deal 599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * of work on 16-bit-int machines. 609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * The dequantized coefficients are not integers because the AA&N scaling 629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * factors have been incorporated. We represent them scaled up by PASS1_BITS, 639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * so that the first and second IDCT rounds have the same input scaling. 649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * For 8-bit JSAMPLEs, we choose IFAST_SCALE_BITS = PASS1_BITS so as to 659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * avoid a descaling shift; this compromises accuracy rather drastically 669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * for small quantization table entries, but it saves a lot of shifts. 679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * For 12-bit JSAMPLEs, there's no hope of using 16x16 multiplies anyway, 689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * so we use a much larger scaling factor to preserve accuracy. 699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * A final compromise is to represent the multiplicative constants to only 719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 8 fractional bits, rather than 13. This saves some shifting work on some 729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * machines, and may also reduce the cost of multiplication (since there 739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * are fewer one-bits in the constants). 749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#if BITS_IN_JSAMPLE == 8 779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define CONST_BITS 8 789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define PASS1_BITS 2 799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#else 809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define CONST_BITS 8 819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define PASS1_BITS 1 /* lose a little precision to avoid overflow */ 829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Some C compilers fail to reduce "FIX(constant)" at compile time, thus 859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * causing a lot of useless floating-point operations at run time. 869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * To get around this we use the following pre-calculated constants. 879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * If you change CONST_BITS you may want to add appropriate values. 889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * (With a reasonable C compiler, you can just rely on the FIX() macro...) 899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#if CONST_BITS == 8 929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_1_082392200 ((INT32) 277) /* FIX(1.082392200) */ 939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_1_414213562 ((INT32) 362) /* FIX(1.414213562) */ 949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_1_847759065 ((INT32) 473) /* FIX(1.847759065) */ 959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_2_613125930 ((INT32) 669) /* FIX(2.613125930) */ 969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#else 979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_1_082392200 FIX(1.082392200) 989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_1_414213562 FIX(1.414213562) 999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_1_847759065 FIX(1.847759065) 1009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_2_613125930 FIX(2.613125930) 1019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 1029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* We can gain a little more speed, with a further compromise in accuracy, 1059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * by omitting the addition in a descaling shift. This yields an incorrectly 1069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * rounded result half the time... 1079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 1089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifndef USE_ACCURATE_ROUNDING 1109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#undef DESCALE 1119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define DESCALE(x,n) RIGHT_SHIFT(x, n) 1129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 1139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Multiply a DCTELEM variable by an INT32 constant, and immediately 1169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * descale to yield a DCTELEM result. 1179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 1189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define MULTIPLY(var,const) ((DCTELEM) DESCALE((var) * (const), CONST_BITS)) 1209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Dequantize a coefficient by multiplying it by the multiplier-table 1239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * entry; produce a DCTELEM result. For 8-bit data a 16x16->16 1249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * multiplication will do. For 12-bit data, the multiplier table is 1259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * declared INT32, so a 32-bit multiply will be used. 1269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 1279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#if BITS_IN_JSAMPLE == 8 1299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define DEQUANTIZE(coef,quantval) (((IFAST_MULT_TYPE) (coef)) * (quantval)) 1309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#else 1319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define DEQUANTIZE(coef,quantval) \ 1329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project DESCALE((coef)*(quantval), IFAST_SCALE_BITS-PASS1_BITS) 1339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 1349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Like DESCALE, but applies to a DCTELEM and produces an int. 1379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * We assume that int right shift is unsigned if INT32 right shift is. 1389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 1399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifdef RIGHT_SHIFT_IS_UNSIGNED 1419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define ISHIFT_TEMPS DCTELEM ishift_temp; 1429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#if BITS_IN_JSAMPLE == 8 1439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define DCTELEMBITS 16 /* DCTELEM may be 16 or 32 bits */ 1449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#else 1459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define DCTELEMBITS 32 /* DCTELEM must be 32 bits */ 1469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 1479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define IRIGHT_SHIFT(x,shft) \ 1489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ((ishift_temp = (x)) < 0 ? \ 1499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (ishift_temp >> (shft)) | ((~((DCTELEM) 0)) << (DCTELEMBITS-(shft))) : \ 1509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (ishift_temp >> (shft))) 1519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#else 1529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define ISHIFT_TEMPS 1539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define IRIGHT_SHIFT(x,shft) ((x) >> (shft)) 1549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 1559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifdef USE_ACCURATE_ROUNDING 1579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define IDESCALE(x,n) ((int) IRIGHT_SHIFT((x) + (1 << ((n)-1)), n)) 1589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#else 1599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define IDESCALE(x,n) ((int) IRIGHT_SHIFT(x, n)) 1609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 1619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 1649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Perform dequantization and inverse DCT on one block of coefficients. 1659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 1669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectGLOBAL(void) 1689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectjpeg_idct_ifast (j_decompress_ptr cinfo, jpeg_component_info * compptr, 1699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JCOEFPTR coef_block, 1709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPARRAY output_buf, JDIMENSION output_col) 1719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 1729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project DCTELEM tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7; 1739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project DCTELEM tmp10, tmp11, tmp12, tmp13; 1749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project DCTELEM z5, z10, z11, z12, z13; 1759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JCOEFPTR inptr; 1769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project IFAST_MULT_TYPE * quantptr; 1779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int * wsptr; 1789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPROW outptr; 1799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPLE *range_limit = IDCT_range_limit(cinfo); 1809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int ctr; 1819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int workspace[DCTSIZE2]; /* buffers data between passes */ 1829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project SHIFT_TEMPS /* for DESCALE */ 1839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ISHIFT_TEMPS /* for IDESCALE */ 1849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Pass 1: process columns from input, store into work array. */ 1869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inptr = coef_block; 1889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project quantptr = (IFAST_MULT_TYPE *) compptr->dct_table; 1899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr = workspace; 1909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (ctr = DCTSIZE; ctr > 0; ctr--) { 1919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Due to quantization, we will usually find that many of the input 1929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * coefficients are zero, especially the AC terms. We can exploit this 1939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * by short-circuiting the IDCT calculation for any column in which all 1949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * the AC terms are zero. In that case each output is equal to the 1959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * DC coefficient (with scale factor as needed). 1969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * With typical images and quantization tables, half or more of the 1979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * column DCT calculations can be simplified this way. 1989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 1999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (inptr[DCTSIZE*1] == 0 && inptr[DCTSIZE*2] == 0 && 2019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inptr[DCTSIZE*3] == 0 && inptr[DCTSIZE*4] == 0 && 2029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inptr[DCTSIZE*5] == 0 && inptr[DCTSIZE*6] == 0 && 2039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inptr[DCTSIZE*7] == 0) { 2049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* AC terms all zero */ 2059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int dcval = (int) DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); 2069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*0] = dcval; 2089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*1] = dcval; 2099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*2] = dcval; 2109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*3] = dcval; 2119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*4] = dcval; 2129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*5] = dcval; 2139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*6] = dcval; 2149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*7] = dcval; 2159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inptr++; /* advance pointers to next column */ 2179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project quantptr++; 2189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr++; 2199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project continue; 2209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Even part */ 2239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); 2259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp1 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); 2269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp2 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); 2279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); 2289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp10 = tmp0 + tmp2; /* phase 3 */ 2309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp11 = tmp0 - tmp2; 2319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp13 = tmp1 + tmp3; /* phases 5-3 */ 2339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp12 = MULTIPLY(tmp1 - tmp3, FIX_1_414213562) - tmp13; /* 2*c4 */ 2349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp0 = tmp10 + tmp13; /* phase 2 */ 2369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp3 = tmp10 - tmp13; 2379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp1 = tmp11 + tmp12; 2389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp2 = tmp11 - tmp12; 2399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Odd part */ 2419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp4 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); 2439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp5 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); 2449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp6 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); 2459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp7 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); 2469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z13 = tmp6 + tmp5; /* phase 6 */ 2489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z10 = tmp6 - tmp5; 2499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z11 = tmp4 + tmp7; 2509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z12 = tmp4 - tmp7; 2519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp7 = z11 + z13; /* phase 5 */ 2539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp11 = MULTIPLY(z11 - z13, FIX_1_414213562); /* 2*c4 */ 2549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z5 = MULTIPLY(z10 + z12, FIX_1_847759065); /* 2*c2 */ 2569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp10 = MULTIPLY(z12, FIX_1_082392200) - z5; /* 2*(c2-c6) */ 2579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp12 = MULTIPLY(z10, - FIX_2_613125930) + z5; /* -2*(c2+c6) */ 2589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp6 = tmp12 - tmp7; /* phase 2 */ 2609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp5 = tmp11 - tmp6; 2619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp4 = tmp10 + tmp5; 2629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*0] = (int) (tmp0 + tmp7); 2649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*7] = (int) (tmp0 - tmp7); 2659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*1] = (int) (tmp1 + tmp6); 2669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*6] = (int) (tmp1 - tmp6); 2679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*2] = (int) (tmp2 + tmp5); 2689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*5] = (int) (tmp2 - tmp5); 2699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*4] = (int) (tmp3 + tmp4); 2709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*3] = (int) (tmp3 - tmp4); 2719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inptr++; /* advance pointers to next column */ 2739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project quantptr++; 2749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr++; 2759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Pass 2: process rows from work array, store into output array. */ 2789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Note that we must descale the results by a factor of 8 == 2**3, */ 2799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* and also undo the PASS1_BITS scaling. */ 2809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr = workspace; 2829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (ctr = 0; ctr < DCTSIZE; ctr++) { 2839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr = output_buf[ctr] + output_col; 2849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Rows of zeroes can be exploited in the same way as we did with columns. 2859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * However, the column calculation has created many nonzero AC terms, so 2869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * the simplification applies less often (typically 5% to 10% of the time). 2879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * On machines with very fast multiplication, it's possible that the 2889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * test takes more time than it's worth. In that case this section 2899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * may be commented out. 2909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 2919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifndef NO_ZERO_ROW_TEST 2939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (wsptr[1] == 0 && wsptr[2] == 0 && wsptr[3] == 0 && wsptr[4] == 0 && 2949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[5] == 0 && wsptr[6] == 0 && wsptr[7] == 0) { 2959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* AC terms all zero */ 2969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPLE dcval = range_limit[IDESCALE(wsptr[0], PASS1_BITS+3) 2979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project & RANGE_MASK]; 2989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[0] = dcval; 3009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[1] = dcval; 3019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[2] = dcval; 3029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[3] = dcval; 3039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[4] = dcval; 3049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[5] = dcval; 3059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[6] = dcval; 3069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[7] = dcval; 3079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr += DCTSIZE; /* advance pointer to next row */ 3099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project continue; 3109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 3129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Even part */ 3149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp10 = ((DCTELEM) wsptr[0] + (DCTELEM) wsptr[4]); 3169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp11 = ((DCTELEM) wsptr[0] - (DCTELEM) wsptr[4]); 3179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp13 = ((DCTELEM) wsptr[2] + (DCTELEM) wsptr[6]); 3199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp12 = MULTIPLY((DCTELEM) wsptr[2] - (DCTELEM) wsptr[6], FIX_1_414213562) 3209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project - tmp13; 3219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp0 = tmp10 + tmp13; 3239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp3 = tmp10 - tmp13; 3249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp1 = tmp11 + tmp12; 3259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp2 = tmp11 - tmp12; 3269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Odd part */ 3289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z13 = (DCTELEM) wsptr[5] + (DCTELEM) wsptr[3]; 3309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z10 = (DCTELEM) wsptr[5] - (DCTELEM) wsptr[3]; 3319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z11 = (DCTELEM) wsptr[1] + (DCTELEM) wsptr[7]; 3329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z12 = (DCTELEM) wsptr[1] - (DCTELEM) wsptr[7]; 3339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp7 = z11 + z13; /* phase 5 */ 3359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp11 = MULTIPLY(z11 - z13, FIX_1_414213562); /* 2*c4 */ 3369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z5 = MULTIPLY(z10 + z12, FIX_1_847759065); /* 2*c2 */ 3389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp10 = MULTIPLY(z12, FIX_1_082392200) - z5; /* 2*(c2-c6) */ 3399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp12 = MULTIPLY(z10, - FIX_2_613125930) + z5; /* -2*(c2+c6) */ 3409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp6 = tmp12 - tmp7; /* phase 2 */ 3429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp5 = tmp11 - tmp6; 3439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp4 = tmp10 + tmp5; 3449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Final output stage: scale down by a factor of 8 and range-limit */ 3469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[0] = range_limit[IDESCALE(tmp0 + tmp7, PASS1_BITS+3) 3489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project & RANGE_MASK]; 3499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[7] = range_limit[IDESCALE(tmp0 - tmp7, PASS1_BITS+3) 3509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project & RANGE_MASK]; 3519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[1] = range_limit[IDESCALE(tmp1 + tmp6, PASS1_BITS+3) 3529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project & RANGE_MASK]; 3539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[6] = range_limit[IDESCALE(tmp1 - tmp6, PASS1_BITS+3) 3549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project & RANGE_MASK]; 3559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[2] = range_limit[IDESCALE(tmp2 + tmp5, PASS1_BITS+3) 3569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project & RANGE_MASK]; 3579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[5] = range_limit[IDESCALE(tmp2 - tmp5, PASS1_BITS+3) 3589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project & RANGE_MASK]; 3599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[4] = range_limit[IDESCALE(tmp3 + tmp4, PASS1_BITS+3) 3609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project & RANGE_MASK]; 3619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[3] = range_limit[IDESCALE(tmp3 - tmp4, PASS1_BITS+3) 3629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project & RANGE_MASK]; 3639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr += DCTSIZE; /* advance pointer to next row */ 3659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 3679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif /* DCT_IFAST_SUPPORTED */ 369