19f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 29f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * jfdctfst.c 39f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 49f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Copyright (C) 1994-1996, 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 * forward DCT (Discrete Cosine Transform). 109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * A 2-D DCT can be done by 1-D DCT on each row followed by 1-D DCT 129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * on each column. Direct algorithms are also available, but they are 139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * much more complex and seem not to be any faster when reduced to code. 149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * This implementation is based on Arai, Agui, and Nakajima's algorithm for 169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * scaled DCT. Their original paper (Trans. IEICE E-71(11):1095) is in 179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Japanese, but the algorithm is described in the Pennebaker & Mitchell 189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * JPEG textbook (see REFERENCES section in file README). The following code 199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * is based directly on figure 4-8 in P&M. 209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * While an 8-point DCT cannot be done in less than 11 multiplies, it is 219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * possible to arrange the computation so that many of the multiplies are 229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * simple scalings of the final outputs. These multiplies can then be 239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * folded into the multiplications or divisions by the JPEG quantization 249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * table entries. The AA&N method leaves only 5 multiplies and 29 adds 259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * to be done in the DCT itself. 269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * The primary disadvantage of this method is that with fixed-point math, 279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * accuracy is lost due to imprecise representation of the scaled 289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * quantization values. The smaller the quantization table entry, the less 299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * precise the scaled value, so this implementation does worse with high- 309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * quality-setting files than with low-quality ones. 319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define JPEG_INTERNALS 349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#include "jinclude.h" 359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#include "jpeglib.h" 369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#include "jdct.h" /* Private declarations for DCT subsystem */ 379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifdef DCT_IFAST_SUPPORTED 399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * This module is specialized to the case DCTSIZE = 8. 439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#if DCTSIZE != 8 469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project Sorry, this code only copes with 8x8 DCTs. /* deliberate syntax err */ 479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Scaling decisions are generally the same as in the LL&M algorithm; 519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * see jfdctint.c for more details. However, we choose to descale 529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * (right shift) multiplication products as soon as they are formed, 539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * rather than carrying additional fractional bits into subsequent additions. 549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * This compromises accuracy slightly, but it lets us save a few shifts. 559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * More importantly, 16-bit arithmetic is then adequate (for 8-bit samples) 569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * everywhere except in the multiplications proper; this saves a good deal 579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * of work on 16-bit-int machines. 589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Again to save a few shifts, the intermediate results between pass 1 and 609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * pass 2 are not upscaled, but are represented only to integral precision. 619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * A final compromise is to represent the multiplicative constants to only 639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 8 fractional bits, rather than 13. This saves some shifting work on some 649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * machines, and may also reduce the cost of multiplication (since there 659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * are fewer one-bits in the constants). 669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define CONST_BITS 8 699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Some C compilers fail to reduce "FIX(constant)" at compile time, thus 729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * causing a lot of useless floating-point operations at run time. 739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * To get around this we use the following pre-calculated constants. 749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * If you change CONST_BITS you may want to add appropriate values. 759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * (With a reasonable C compiler, you can just rely on the FIX() macro...) 769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#if CONST_BITS == 8 799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_0_382683433 ((INT32) 98) /* FIX(0.382683433) */ 809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_0_541196100 ((INT32) 139) /* FIX(0.541196100) */ 819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_0_707106781 ((INT32) 181) /* FIX(0.707106781) */ 829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_1_306562965 ((INT32) 334) /* FIX(1.306562965) */ 839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#else 849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_0_382683433 FIX(0.382683433) 859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_0_541196100 FIX(0.541196100) 869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_0_707106781 FIX(0.707106781) 879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_1_306562965 FIX(1.306562965) 889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* We can gain a little more speed, with a further compromise in accuracy, 929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * by omitting the addition in a descaling shift. This yields an incorrectly 939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * rounded result half the time... 949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifndef USE_ACCURATE_ROUNDING 979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#undef DESCALE 989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define DESCALE(x,n) RIGHT_SHIFT(x, n) 999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 1009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Multiply a DCTELEM variable by an INT32 constant, and immediately 1039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * descale to yield a DCTELEM result. 1049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 1059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define MULTIPLY(var,const) ((DCTELEM) DESCALE((var) * (const), CONST_BITS)) 1079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 1109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Perform the forward DCT on one block of samples. 1119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 1129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectGLOBAL(void) 1149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectjpeg_fdct_ifast (DCTELEM * data) 1159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 1169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project DCTELEM tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7; 1179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project DCTELEM tmp10, tmp11, tmp12, tmp13; 1189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project DCTELEM z1, z2, z3, z4, z5, z11, z13; 1199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project DCTELEM *dataptr; 1209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int ctr; 1219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project SHIFT_TEMPS 1229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Pass 1: process rows. */ 1249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project dataptr = data; 1269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (ctr = DCTSIZE-1; ctr >= 0; ctr--) { 1279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp0 = dataptr[0] + dataptr[7]; 1289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp7 = dataptr[0] - dataptr[7]; 1299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp1 = dataptr[1] + dataptr[6]; 1309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp6 = dataptr[1] - dataptr[6]; 1319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp2 = dataptr[2] + dataptr[5]; 1329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp5 = dataptr[2] - dataptr[5]; 1339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp3 = dataptr[3] + dataptr[4]; 1349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp4 = dataptr[3] - dataptr[4]; 1359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Even part */ 1379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp10 = tmp0 + tmp3; /* phase 2 */ 1399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp13 = tmp0 - tmp3; 1409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp11 = tmp1 + tmp2; 1419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp12 = tmp1 - tmp2; 1429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project dataptr[0] = tmp10 + tmp11; /* phase 3 */ 1449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project dataptr[4] = tmp10 - tmp11; 1459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z1 = MULTIPLY(tmp12 + tmp13, FIX_0_707106781); /* c4 */ 1479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project dataptr[2] = tmp13 + z1; /* phase 5 */ 1489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project dataptr[6] = tmp13 - z1; 1499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Odd part */ 1519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp10 = tmp4 + tmp5; /* phase 2 */ 1539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp11 = tmp5 + tmp6; 1549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp12 = tmp6 + tmp7; 1559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* The rotator is modified from fig 4-8 to avoid extra negations. */ 1579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z5 = MULTIPLY(tmp10 - tmp12, FIX_0_382683433); /* c6 */ 1589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z2 = MULTIPLY(tmp10, FIX_0_541196100) + z5; /* c2-c6 */ 1599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z4 = MULTIPLY(tmp12, FIX_1_306562965) + z5; /* c2+c6 */ 1609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z3 = MULTIPLY(tmp11, FIX_0_707106781); /* c4 */ 1619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z11 = tmp7 + z3; /* phase 5 */ 1639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z13 = tmp7 - z3; 1649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project dataptr[5] = z13 + z2; /* phase 6 */ 1669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project dataptr[3] = z13 - z2; 1679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project dataptr[1] = z11 + z4; 1689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project dataptr[7] = z11 - z4; 1699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project dataptr += DCTSIZE; /* advance pointer to next row */ 1719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 1729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Pass 2: process columns. */ 1749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project dataptr = data; 1769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (ctr = DCTSIZE-1; ctr >= 0; ctr--) { 1779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp0 = dataptr[DCTSIZE*0] + dataptr[DCTSIZE*7]; 1789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp7 = dataptr[DCTSIZE*0] - dataptr[DCTSIZE*7]; 1799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp1 = dataptr[DCTSIZE*1] + dataptr[DCTSIZE*6]; 1809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp6 = dataptr[DCTSIZE*1] - dataptr[DCTSIZE*6]; 1819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp2 = dataptr[DCTSIZE*2] + dataptr[DCTSIZE*5]; 1829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp5 = dataptr[DCTSIZE*2] - dataptr[DCTSIZE*5]; 1839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp3 = dataptr[DCTSIZE*3] + dataptr[DCTSIZE*4]; 1849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp4 = dataptr[DCTSIZE*3] - dataptr[DCTSIZE*4]; 1859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Even part */ 1879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp10 = tmp0 + tmp3; /* phase 2 */ 1899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp13 = tmp0 - tmp3; 1909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp11 = tmp1 + tmp2; 1919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp12 = tmp1 - tmp2; 1929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project dataptr[DCTSIZE*0] = tmp10 + tmp11; /* phase 3 */ 1949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project dataptr[DCTSIZE*4] = tmp10 - tmp11; 1959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z1 = MULTIPLY(tmp12 + tmp13, FIX_0_707106781); /* c4 */ 1979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project dataptr[DCTSIZE*2] = tmp13 + z1; /* phase 5 */ 1989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project dataptr[DCTSIZE*6] = tmp13 - z1; 1999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Odd part */ 2019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp10 = tmp4 + tmp5; /* phase 2 */ 2039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp11 = tmp5 + tmp6; 2049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp12 = tmp6 + tmp7; 2059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* The rotator is modified from fig 4-8 to avoid extra negations. */ 2079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z5 = MULTIPLY(tmp10 - tmp12, FIX_0_382683433); /* c6 */ 2089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z2 = MULTIPLY(tmp10, FIX_0_541196100) + z5; /* c2-c6 */ 2099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z4 = MULTIPLY(tmp12, FIX_1_306562965) + z5; /* c2+c6 */ 2109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z3 = MULTIPLY(tmp11, FIX_0_707106781); /* c4 */ 2119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z11 = tmp7 + z3; /* phase 5 */ 2139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z13 = tmp7 - z3; 2149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project dataptr[DCTSIZE*5] = z13 + z2; /* phase 6 */ 2169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project dataptr[DCTSIZE*3] = z13 - z2; 2179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project dataptr[DCTSIZE*1] = z11 + z4; 2189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project dataptr[DCTSIZE*7] = z11 - z4; 2199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project dataptr++; /* advance pointer to next column */ 2219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 2239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif /* DCT_IFAST_SUPPORTED */ 225