19f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 29f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * jidctint.c 39f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 49f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Copyright (C) 1991-1998, 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 slow-but-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 an algorithm described in 189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * C. Loeffler, A. Ligtenberg and G. Moschytz, "Practical Fast 1-D DCT 199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Algorithms with 11 Multiplications", Proc. Int'l. Conf. on Acoustics, 209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Speech, and Signal Processing 1989 (ICASSP '89), pp. 988-991. 219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * The primary algorithm described there uses 11 multiplies and 29 adds. 229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * We use their alternate method with 12 multiplies and 32 adds. 239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * The advantage of this method is that no data path contains more than one 249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * multiplication; this allows a very simple and accurate implementation in 259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * scaled fixed-point arithmetic, with a minimal number of shifts. 269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define JPEG_INTERNALS 299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#include "jinclude.h" 309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#include "jpeglib.h" 319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#include "jdct.h" /* Private declarations for DCT subsystem */ 329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifdef DCT_ISLOW_SUPPORTED 349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * This module is specialized to the case DCTSIZE = 8. 389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#if DCTSIZE != 8 419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project Sorry, this code only copes with 8x8 DCTs. /* deliberate syntax err */ 429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * The poop on this scaling stuff is as follows: 479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Each 1-D IDCT step produces outputs which are a factor of sqrt(N) 499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * larger than the true IDCT outputs. The final outputs are therefore 509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * a factor of N larger than desired; since N=8 this can be cured by 519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * a simple right shift at the end of the algorithm. The advantage of 529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * this arrangement is that we save two multiplications per 1-D IDCT, 539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * because the y0 and y4 inputs need not be divided by sqrt(N). 549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * We have to do addition and subtraction of the integer inputs, which 569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * is no problem, and multiplication by fractional constants, which is 579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * a problem to do in integer arithmetic. We multiply all the constants 589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * by CONST_SCALE and convert them to integer constants (thus retaining 599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * CONST_BITS bits of precision in the constants). After doing a 609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * multiplication we have to divide the product by CONST_SCALE, with proper 619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * rounding, to produce the correct output. This division can be done 629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * cheaply as a right shift of CONST_BITS bits. We postpone shifting 639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * as long as possible so that partial sums can be added together with 649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * full fractional precision. 659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * The outputs of the first pass are scaled up by PASS1_BITS bits so that 679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * they are represented to better-than-integral precision. These outputs 689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * require BITS_IN_JSAMPLE + PASS1_BITS + 3 bits; this fits in a 16-bit word 699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * with the recommended scaling. (To scale up 12-bit sample data further, an 709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * intermediate INT32 array would be needed.) 719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * To avoid overflow of the 32-bit intermediate results in pass 2, we must 739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * have BITS_IN_JSAMPLE + CONST_BITS + PASS1_BITS <= 26. Error analysis 749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * shows that the values given below are the most effective. 759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#if BITS_IN_JSAMPLE == 8 789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define CONST_BITS 13 799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define PASS1_BITS 2 809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#else 819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define CONST_BITS 13 829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define PASS1_BITS 1 /* lose a little precision to avoid overflow */ 839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Some C compilers fail to reduce "FIX(constant)" at compile time, thus 869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * causing a lot of useless floating-point operations at run time. 879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * To get around this we use the following pre-calculated constants. 889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * If you change CONST_BITS you may want to add appropriate values. 899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * (With a reasonable C compiler, you can just rely on the FIX() macro...) 909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#if CONST_BITS == 13 939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_0_298631336 ((INT32) 2446) /* FIX(0.298631336) */ 949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_0_390180644 ((INT32) 3196) /* FIX(0.390180644) */ 959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_0_541196100 ((INT32) 4433) /* FIX(0.541196100) */ 969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_0_765366865 ((INT32) 6270) /* FIX(0.765366865) */ 979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_0_899976223 ((INT32) 7373) /* FIX(0.899976223) */ 989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_1_175875602 ((INT32) 9633) /* FIX(1.175875602) */ 999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_1_501321110 ((INT32) 12299) /* FIX(1.501321110) */ 1009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_1_847759065 ((INT32) 15137) /* FIX(1.847759065) */ 1019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_1_961570560 ((INT32) 16069) /* FIX(1.961570560) */ 1029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_2_053119869 ((INT32) 16819) /* FIX(2.053119869) */ 1039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_2_562915447 ((INT32) 20995) /* FIX(2.562915447) */ 1049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_3_072711026 ((INT32) 25172) /* FIX(3.072711026) */ 1059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#else 1069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_0_298631336 FIX(0.298631336) 1079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_0_390180644 FIX(0.390180644) 1089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_0_541196100 FIX(0.541196100) 1099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_0_765366865 FIX(0.765366865) 1109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_0_899976223 FIX(0.899976223) 1119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_1_175875602 FIX(1.175875602) 1129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_1_501321110 FIX(1.501321110) 1139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_1_847759065 FIX(1.847759065) 1149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_1_961570560 FIX(1.961570560) 1159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_2_053119869 FIX(2.053119869) 1169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_2_562915447 FIX(2.562915447) 1179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_3_072711026 FIX(3.072711026) 1189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 1199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Multiply an INT32 variable by an INT32 constant to yield an INT32 result. 1229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * For 8-bit samples with the recommended scaling, all the variable 1239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * and constant values involved are no more than 16 bits wide, so a 1249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 16x16->32 bit multiply can be used instead of a full 32x32 multiply. 1259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * For 12-bit samples, a full 32-bit multiplication will be needed. 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 MULTIPLY(var,const) MULTIPLY16C16(var,const) 1309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#else 1319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define MULTIPLY(var,const) ((var) * (const)) 1329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 1339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Dequantize a coefficient by multiplying it by the multiplier-table 1369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * entry; produce an int result. In this module, both inputs and result 1379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * are 16 bits or less, so either int or short multiply will work. 1389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 1399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define DEQUANTIZE(coef,quantval) (((ISLOW_MULT_TYPE) (coef)) * (quantval)) 1419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 1449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Perform dequantization and inverse DCT on one block of coefficients. 1459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 1469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectGLOBAL(void) 1489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectjpeg_idct_islow (j_decompress_ptr cinfo, jpeg_component_info * compptr, 1499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JCOEFPTR coef_block, 1509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPARRAY output_buf, JDIMENSION output_col) 1519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 1529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project INT32 tmp0, tmp1, tmp2, tmp3; 1539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project INT32 tmp10, tmp11, tmp12, tmp13; 1549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project INT32 z1, z2, z3, z4, z5; 1559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JCOEFPTR inptr; 1569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ISLOW_MULT_TYPE * quantptr; 1579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int * wsptr; 1589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPROW outptr; 1599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPLE *range_limit = IDCT_range_limit(cinfo); 1609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int ctr; 1619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int workspace[DCTSIZE2]; /* buffers data between passes */ 1629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project SHIFT_TEMPS 1639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Pass 1: process columns from input, store into work array. */ 1659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Note results are scaled up by sqrt(8) compared to a true IDCT; */ 1669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* furthermore, we scale the results by 2**PASS1_BITS. */ 1679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inptr = coef_block; 1699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; 1709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr = workspace; 1719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (ctr = DCTSIZE; ctr > 0; ctr--) { 1729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Due to quantization, we will usually find that many of the input 1739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * coefficients are zero, especially the AC terms. We can exploit this 1749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * by short-circuiting the IDCT calculation for any column in which all 1759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * the AC terms are zero. In that case each output is equal to the 1769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * DC coefficient (with scale factor as needed). 1779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * With typical images and quantization tables, half or more of the 1789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * column DCT calculations can be simplified this way. 1799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 1809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (inptr[DCTSIZE*1] == 0 && inptr[DCTSIZE*2] == 0 && 1829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inptr[DCTSIZE*3] == 0 && inptr[DCTSIZE*4] == 0 && 1839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inptr[DCTSIZE*5] == 0 && inptr[DCTSIZE*6] == 0 && 1849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inptr[DCTSIZE*7] == 0) { 1859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* AC terms all zero */ 1869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int dcval = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]) << PASS1_BITS; 1879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*0] = dcval; 1899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*1] = dcval; 1909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*2] = dcval; 1919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*3] = dcval; 1929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*4] = dcval; 1939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*5] = dcval; 1949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*6] = dcval; 1959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*7] = dcval; 1969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inptr++; /* advance pointers to next column */ 1989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project quantptr++; 1999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr++; 2009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project continue; 2019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Even part: reverse the even part of the forward DCT. */ 2049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* The rotator is sqrt(2)*c(-6). */ 2059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); 2079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); 2089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z1 = MULTIPLY(z2 + z3, FIX_0_541196100); 2109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp2 = z1 + MULTIPLY(z3, - FIX_1_847759065); 2119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp3 = z1 + MULTIPLY(z2, FIX_0_765366865); 2129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z2 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); 2149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z3 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); 2159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp0 = (z2 + z3) << CONST_BITS; 2179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp1 = (z2 - z3) << CONST_BITS; 2189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp10 = tmp0 + tmp3; 2209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp13 = tmp0 - tmp3; 2219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp11 = tmp1 + tmp2; 2229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp12 = tmp1 - tmp2; 2239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Odd part per figure 8; the matrix is unitary and hence its 2259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively. 2269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 2279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp0 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); 2299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp1 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); 2309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); 2319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp3 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); 2329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z1 = tmp0 + tmp3; 2349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z2 = tmp1 + tmp2; 2359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z3 = tmp0 + tmp2; 2369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z4 = tmp1 + tmp3; 2379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z5 = MULTIPLY(z3 + z4, FIX_1_175875602); /* sqrt(2) * c3 */ 2389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp0 = MULTIPLY(tmp0, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */ 2409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp1 = MULTIPLY(tmp1, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */ 2419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp2 = MULTIPLY(tmp2, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */ 2429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp3 = MULTIPLY(tmp3, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */ 2439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z1 = MULTIPLY(z1, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */ 2449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z2 = MULTIPLY(z2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */ 2459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z3 = MULTIPLY(z3, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */ 2469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z4 = MULTIPLY(z4, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */ 2479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z3 += z5; 2499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z4 += z5; 2509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp0 += z1 + z3; 2529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp1 += z2 + z4; 2539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp2 += z2 + z3; 2549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp3 += z1 + z4; 2559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */ 2579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*0] = (int) DESCALE(tmp10 + tmp3, CONST_BITS-PASS1_BITS); 2599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*7] = (int) DESCALE(tmp10 - tmp3, CONST_BITS-PASS1_BITS); 2609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*1] = (int) DESCALE(tmp11 + tmp2, CONST_BITS-PASS1_BITS); 2619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*6] = (int) DESCALE(tmp11 - tmp2, CONST_BITS-PASS1_BITS); 2629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*2] = (int) DESCALE(tmp12 + tmp1, CONST_BITS-PASS1_BITS); 2639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*5] = (int) DESCALE(tmp12 - tmp1, CONST_BITS-PASS1_BITS); 2649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*3] = (int) DESCALE(tmp13 + tmp0, CONST_BITS-PASS1_BITS); 2659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*4] = (int) DESCALE(tmp13 - tmp0, CONST_BITS-PASS1_BITS); 2669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inptr++; /* advance pointers to next column */ 2689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project quantptr++; 2699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr++; 2709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Pass 2: process rows from work array, store into output array. */ 2739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Note that we must descale the results by a factor of 8 == 2**3, */ 2749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* and also undo the PASS1_BITS scaling. */ 2759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr = workspace; 2779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (ctr = 0; ctr < DCTSIZE; ctr++) { 2789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr = output_buf[ctr] + output_col; 2799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Rows of zeroes can be exploited in the same way as we did with columns. 2809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * However, the column calculation has created many nonzero AC terms, so 2819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * the simplification applies less often (typically 5% to 10% of the time). 2829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * On machines with very fast multiplication, it's possible that the 2839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * test takes more time than it's worth. In that case this section 2849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * may be commented out. 2859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 2869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifndef NO_ZERO_ROW_TEST 2889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (wsptr[1] == 0 && wsptr[2] == 0 && wsptr[3] == 0 && wsptr[4] == 0 && 2899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[5] == 0 && wsptr[6] == 0 && wsptr[7] == 0) { 2909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* AC terms all zero */ 2919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPLE dcval = range_limit[(int) DESCALE((INT32) wsptr[0], PASS1_BITS+3) 2929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project & RANGE_MASK]; 2939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[0] = dcval; 2959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[1] = dcval; 2969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[2] = dcval; 2979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[3] = dcval; 2989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[4] = dcval; 2999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[5] = dcval; 3009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[6] = dcval; 3019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[7] = dcval; 3029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr += DCTSIZE; /* advance pointer to next row */ 3049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project continue; 3059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 3079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Even part: reverse the even part of the forward DCT. */ 3099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* The rotator is sqrt(2)*c(-6). */ 3109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z2 = (INT32) wsptr[2]; 3129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z3 = (INT32) wsptr[6]; 3139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z1 = MULTIPLY(z2 + z3, FIX_0_541196100); 3159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp2 = z1 + MULTIPLY(z3, - FIX_1_847759065); 3169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp3 = z1 + MULTIPLY(z2, FIX_0_765366865); 3179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp0 = ((INT32) wsptr[0] + (INT32) wsptr[4]) << CONST_BITS; 3199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp1 = ((INT32) wsptr[0] - (INT32) wsptr[4]) << CONST_BITS; 3209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp10 = tmp0 + tmp3; 3229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp13 = tmp0 - tmp3; 3239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp11 = tmp1 + tmp2; 3249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp12 = tmp1 - tmp2; 3259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Odd part per figure 8; the matrix is unitary and hence its 3279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively. 3289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 3299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp0 = (INT32) wsptr[7]; 3319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp1 = (INT32) wsptr[5]; 3329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp2 = (INT32) wsptr[3]; 3339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp3 = (INT32) wsptr[1]; 3349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z1 = tmp0 + tmp3; 3369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z2 = tmp1 + tmp2; 3379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z3 = tmp0 + tmp2; 3389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z4 = tmp1 + tmp3; 3399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z5 = MULTIPLY(z3 + z4, FIX_1_175875602); /* sqrt(2) * c3 */ 3409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp0 = MULTIPLY(tmp0, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */ 3429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp1 = MULTIPLY(tmp1, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */ 3439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp2 = MULTIPLY(tmp2, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */ 3449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp3 = MULTIPLY(tmp3, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */ 3459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z1 = MULTIPLY(z1, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */ 3469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z2 = MULTIPLY(z2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */ 3479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z3 = MULTIPLY(z3, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */ 3489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z4 = MULTIPLY(z4, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */ 3499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z3 += z5; 3519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z4 += z5; 3529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp0 += z1 + z3; 3549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp1 += z2 + z4; 3559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp2 += z2 + z3; 3569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp3 += z1 + z4; 3579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */ 3599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[0] = range_limit[(int) DESCALE(tmp10 + tmp3, 3619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project CONST_BITS+PASS1_BITS+3) 3629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project & RANGE_MASK]; 3639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[7] = range_limit[(int) DESCALE(tmp10 - tmp3, 3649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project CONST_BITS+PASS1_BITS+3) 3659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project & RANGE_MASK]; 3669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[1] = range_limit[(int) DESCALE(tmp11 + tmp2, 3679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project CONST_BITS+PASS1_BITS+3) 3689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project & RANGE_MASK]; 3699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[6] = range_limit[(int) DESCALE(tmp11 - tmp2, 3709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project CONST_BITS+PASS1_BITS+3) 3719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project & RANGE_MASK]; 3729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[2] = range_limit[(int) DESCALE(tmp12 + tmp1, 3739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project CONST_BITS+PASS1_BITS+3) 3749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project & RANGE_MASK]; 3759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[5] = range_limit[(int) DESCALE(tmp12 - tmp1, 3769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project CONST_BITS+PASS1_BITS+3) 3779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project & RANGE_MASK]; 3789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[3] = range_limit[(int) DESCALE(tmp13 + tmp0, 3799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project CONST_BITS+PASS1_BITS+3) 3809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project & RANGE_MASK]; 3819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[4] = range_limit[(int) DESCALE(tmp13 - tmp0, 3829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project CONST_BITS+PASS1_BITS+3) 3839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project & RANGE_MASK]; 3849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr += DCTSIZE; /* advance pointer to next row */ 3869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 3889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif /* DCT_ISLOW_SUPPORTED */ 390