19f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 29f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * jidctred.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 inverse-DCT routines that produce reduced-size output: 99f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * either 4x4, 2x2, or 1x1 pixels from an 8x8 DCT block. 109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * The implementation is based on the Loeffler, Ligtenberg and Moschytz (LL&M) 129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * algorithm used in jidctint.c. We simply replace each 8-to-8 1-D IDCT step 139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * with an 8-to-4 step that produces the four averages of two adjacent outputs 149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * (or an 8-to-2 step producing two averages of four outputs, for 2x2 output). 159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * These steps were derived by computing the corresponding values at the end 169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * of the normal LL&M code, then simplifying as much as possible. 179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 1x1 is trivial: just take the DC coefficient divided by 8. 199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * See jidctint.c for additional comments. 219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define JPEG_INTERNALS 249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#include "jinclude.h" 259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#include "jpeglib.h" 269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#include "jdct.h" /* Private declarations for DCT subsystem */ 279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifdef IDCT_SCALING_SUPPORTED 299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * This module is specialized to the case DCTSIZE = 8. 339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#if DCTSIZE != 8 369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project Sorry, this code only copes with 8x8 DCTs. /* deliberate syntax err */ 379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Scaling is the same as in jidctint.c. */ 419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#if BITS_IN_JSAMPLE == 8 439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define CONST_BITS 13 449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define PASS1_BITS 2 459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#else 469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define CONST_BITS 13 479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define PASS1_BITS 1 /* lose a little precision to avoid overflow */ 489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Some C compilers fail to reduce "FIX(constant)" at compile time, thus 519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * causing a lot of useless floating-point operations at run time. 529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * To get around this we use the following pre-calculated constants. 539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * If you change CONST_BITS you may want to add appropriate values. 549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * (With a reasonable C compiler, you can just rely on the FIX() macro...) 559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#if CONST_BITS == 13 589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_0_211164243 ((INT32) 1730) /* FIX(0.211164243) */ 599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_0_509795579 ((INT32) 4176) /* FIX(0.509795579) */ 609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_0_601344887 ((INT32) 4926) /* FIX(0.601344887) */ 619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_0_720959822 ((INT32) 5906) /* FIX(0.720959822) */ 629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_0_765366865 ((INT32) 6270) /* FIX(0.765366865) */ 639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_0_850430095 ((INT32) 6967) /* FIX(0.850430095) */ 649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_0_899976223 ((INT32) 7373) /* FIX(0.899976223) */ 659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_1_061594337 ((INT32) 8697) /* FIX(1.061594337) */ 669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_1_272758580 ((INT32) 10426) /* FIX(1.272758580) */ 679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_1_451774981 ((INT32) 11893) /* FIX(1.451774981) */ 689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_1_847759065 ((INT32) 15137) /* FIX(1.847759065) */ 699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_2_172734803 ((INT32) 17799) /* FIX(2.172734803) */ 709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_2_562915447 ((INT32) 20995) /* FIX(2.562915447) */ 719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_3_624509785 ((INT32) 29692) /* FIX(3.624509785) */ 729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#else 739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_0_211164243 FIX(0.211164243) 749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_0_509795579 FIX(0.509795579) 759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_0_601344887 FIX(0.601344887) 769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_0_720959822 FIX(0.720959822) 779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_0_765366865 FIX(0.765366865) 789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_0_850430095 FIX(0.850430095) 799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_0_899976223 FIX(0.899976223) 809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_1_061594337 FIX(1.061594337) 819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_1_272758580 FIX(1.272758580) 829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_1_451774981 FIX(1.451774981) 839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_1_847759065 FIX(1.847759065) 849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_2_172734803 FIX(2.172734803) 859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_2_562915447 FIX(2.562915447) 869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define FIX_3_624509785 FIX(3.624509785) 879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Multiply an INT32 variable by an INT32 constant to yield an INT32 result. 919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * For 8-bit samples with the recommended scaling, all the variable 929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * and constant values involved are no more than 16 bits wide, so a 939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 16x16->32 bit multiply can be used instead of a full 32x32 multiply. 949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * For 12-bit samples, a full 32-bit multiplication will be needed. 959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#if BITS_IN_JSAMPLE == 8 989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define MULTIPLY(var,const) MULTIPLY16C16(var,const) 999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#else 1009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define MULTIPLY(var,const) ((var) * (const)) 1019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 1029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Dequantize a coefficient by multiplying it by the multiplier-table 1059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * entry; produce an int result. In this module, both inputs and result 1069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * are 16 bits or less, so either int or short multiply will work. 1079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 1089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define DEQUANTIZE(coef,quantval) (((ISLOW_MULT_TYPE) (coef)) * (quantval)) 1109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 1139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Perform dequantization and inverse DCT on one block of coefficients, 1149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * producing a reduced-size 4x4 output block. 1159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 1169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectGLOBAL(void) 1189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectjpeg_idct_4x4 (j_decompress_ptr cinfo, jpeg_component_info * compptr, 1199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JCOEFPTR coef_block, 1209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPARRAY output_buf, JDIMENSION output_col) 1219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 1229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project INT32 tmp0, tmp2, tmp10, tmp12; 1239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project INT32 z1, z2, z3, z4; 1249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JCOEFPTR inptr; 1259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ISLOW_MULT_TYPE * quantptr; 1269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int * wsptr; 1279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPROW outptr; 1289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPLE *range_limit = IDCT_range_limit(cinfo); 1299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int ctr; 1309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int workspace[DCTSIZE*4]; /* buffers data between passes */ 1319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project SHIFT_TEMPS 1329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Pass 1: process columns from input, store into work array. */ 1349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inptr = coef_block; 1369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; 1379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr = workspace; 1389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (ctr = DCTSIZE; ctr > 0; inptr++, quantptr++, wsptr++, ctr--) { 1399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Don't bother to process column 4, because second pass won't use it */ 1409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (ctr == DCTSIZE-4) 1419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project continue; 1429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (inptr[DCTSIZE*1] == 0 && inptr[DCTSIZE*2] == 0 && 1439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inptr[DCTSIZE*3] == 0 && inptr[DCTSIZE*5] == 0 && 1449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inptr[DCTSIZE*6] == 0 && inptr[DCTSIZE*7] == 0) { 1459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* AC terms all zero; we need not examine term 4 for 4x4 output */ 1469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int dcval = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]) << PASS1_BITS; 1479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*0] = dcval; 1499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*1] = dcval; 1509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*2] = dcval; 1519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*3] = dcval; 1529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project continue; 1549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 1559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Even part */ 1579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp0 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); 1599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp0 <<= (CONST_BITS+1); 1609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); 1629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); 1639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp2 = MULTIPLY(z2, FIX_1_847759065) + MULTIPLY(z3, - FIX_0_765366865); 1659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp10 = tmp0 + tmp2; 1679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp12 = tmp0 - tmp2; 1689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Odd part */ 1709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z1 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); 1729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z2 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); 1739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z3 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); 1749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z4 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); 1759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp0 = MULTIPLY(z1, - FIX_0_211164243) /* sqrt(2) * (c3-c1) */ 1779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project + MULTIPLY(z2, FIX_1_451774981) /* sqrt(2) * (c3+c7) */ 1789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project + MULTIPLY(z3, - FIX_2_172734803) /* sqrt(2) * (-c1-c5) */ 1799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project + MULTIPLY(z4, FIX_1_061594337); /* sqrt(2) * (c5+c7) */ 1809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp2 = MULTIPLY(z1, - FIX_0_509795579) /* sqrt(2) * (c7-c5) */ 1829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project + MULTIPLY(z2, - FIX_0_601344887) /* sqrt(2) * (c5-c1) */ 1839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project + MULTIPLY(z3, FIX_0_899976223) /* sqrt(2) * (c3-c7) */ 1849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project + MULTIPLY(z4, FIX_2_562915447); /* sqrt(2) * (c1+c3) */ 1859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Final output stage */ 1879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*0] = (int) DESCALE(tmp10 + tmp2, CONST_BITS-PASS1_BITS+1); 1899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*3] = (int) DESCALE(tmp10 - tmp2, CONST_BITS-PASS1_BITS+1); 1909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*1] = (int) DESCALE(tmp12 + tmp0, CONST_BITS-PASS1_BITS+1); 1919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*2] = (int) DESCALE(tmp12 - tmp0, CONST_BITS-PASS1_BITS+1); 1929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 1939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Pass 2: process 4 rows from work array, store into output array. */ 1959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr = workspace; 1979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (ctr = 0; ctr < 4; ctr++) { 1989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr = output_buf[ctr] + output_col; 1999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* It's not clear whether a zero row test is worthwhile here ... */ 2009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifndef NO_ZERO_ROW_TEST 2029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (wsptr[1] == 0 && wsptr[2] == 0 && wsptr[3] == 0 && 2039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[5] == 0 && wsptr[6] == 0 && wsptr[7] == 0) { 2049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* AC terms all zero */ 2059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPLE dcval = range_limit[(int) DESCALE((INT32) wsptr[0], PASS1_BITS+3) 2069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project & RANGE_MASK]; 2079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[0] = dcval; 2099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[1] = dcval; 2109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[2] = dcval; 2119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[3] = dcval; 2129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr += DCTSIZE; /* advance pointer to next row */ 2149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project continue; 2159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 2179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Even part */ 2199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp0 = ((INT32) wsptr[0]) << (CONST_BITS+1); 2219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp2 = MULTIPLY((INT32) wsptr[2], FIX_1_847759065) 2239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project + MULTIPLY((INT32) wsptr[6], - FIX_0_765366865); 2249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp10 = tmp0 + tmp2; 2269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp12 = tmp0 - tmp2; 2279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Odd part */ 2299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z1 = (INT32) wsptr[7]; 2319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z2 = (INT32) wsptr[5]; 2329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z3 = (INT32) wsptr[3]; 2339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z4 = (INT32) wsptr[1]; 2349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp0 = MULTIPLY(z1, - FIX_0_211164243) /* sqrt(2) * (c3-c1) */ 2369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project + MULTIPLY(z2, FIX_1_451774981) /* sqrt(2) * (c3+c7) */ 2379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project + MULTIPLY(z3, - FIX_2_172734803) /* sqrt(2) * (-c1-c5) */ 2389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project + MULTIPLY(z4, FIX_1_061594337); /* sqrt(2) * (c5+c7) */ 2399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp2 = MULTIPLY(z1, - FIX_0_509795579) /* sqrt(2) * (c7-c5) */ 2419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project + MULTIPLY(z2, - FIX_0_601344887) /* sqrt(2) * (c5-c1) */ 2429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project + MULTIPLY(z3, FIX_0_899976223) /* sqrt(2) * (c3-c7) */ 2439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project + MULTIPLY(z4, FIX_2_562915447); /* sqrt(2) * (c1+c3) */ 2449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Final output stage */ 2469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[0] = range_limit[(int) DESCALE(tmp10 + tmp2, 2489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project CONST_BITS+PASS1_BITS+3+1) 2499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project & RANGE_MASK]; 2509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[3] = range_limit[(int) DESCALE(tmp10 - tmp2, 2519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project CONST_BITS+PASS1_BITS+3+1) 2529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project & RANGE_MASK]; 2539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[1] = range_limit[(int) DESCALE(tmp12 + tmp0, 2549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project CONST_BITS+PASS1_BITS+3+1) 2559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project & RANGE_MASK]; 2569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[2] = range_limit[(int) DESCALE(tmp12 - tmp0, 2579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project CONST_BITS+PASS1_BITS+3+1) 2589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project & RANGE_MASK]; 2599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr += DCTSIZE; /* advance pointer to next row */ 2619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 2639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 2669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Perform dequantization and inverse DCT on one block of coefficients, 2679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * producing a reduced-size 2x2 output block. 2689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 2699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectGLOBAL(void) 2719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectjpeg_idct_2x2 (j_decompress_ptr cinfo, jpeg_component_info * compptr, 2729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JCOEFPTR coef_block, 2739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPARRAY output_buf, JDIMENSION output_col) 2749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 2759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project INT32 tmp0, tmp10, z1; 2769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JCOEFPTR inptr; 2779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ISLOW_MULT_TYPE * quantptr; 2789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int * wsptr; 2799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPROW outptr; 2809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPLE *range_limit = IDCT_range_limit(cinfo); 2819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int ctr; 2829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int workspace[DCTSIZE*2]; /* buffers data between passes */ 2839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project SHIFT_TEMPS 2849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Pass 1: process columns from input, store into work array. */ 2869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inptr = coef_block; 2889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; 2899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr = workspace; 2909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (ctr = DCTSIZE; ctr > 0; inptr++, quantptr++, wsptr++, ctr--) { 2919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Don't bother to process columns 2,4,6 */ 2929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (ctr == DCTSIZE-2 || ctr == DCTSIZE-4 || ctr == DCTSIZE-6) 2939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project continue; 2949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (inptr[DCTSIZE*1] == 0 && inptr[DCTSIZE*3] == 0 && 2959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inptr[DCTSIZE*5] == 0 && inptr[DCTSIZE*7] == 0) { 2969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* AC terms all zero; we need not examine terms 2,4,6 for 2x2 output */ 2979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int dcval = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]) << PASS1_BITS; 2989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*0] = dcval; 3009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*1] = dcval; 3019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project continue; 3039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Even part */ 3069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z1 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); 3089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp10 = z1 << (CONST_BITS+2); 3099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Odd part */ 3119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z1 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); 3139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp0 = MULTIPLY(z1, - FIX_0_720959822); /* sqrt(2) * (c7-c5+c3-c1) */ 3149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z1 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); 3159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp0 += MULTIPLY(z1, FIX_0_850430095); /* sqrt(2) * (-c1+c3+c5+c7) */ 3169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z1 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); 3179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp0 += MULTIPLY(z1, - FIX_1_272758580); /* sqrt(2) * (-c1+c3-c5-c7) */ 3189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project z1 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); 3199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp0 += MULTIPLY(z1, FIX_3_624509785); /* sqrt(2) * (c1+c3+c5+c7) */ 3209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Final output stage */ 3229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*0] = (int) DESCALE(tmp10 + tmp0, CONST_BITS-PASS1_BITS+2); 3249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr[DCTSIZE*1] = (int) DESCALE(tmp10 - tmp0, CONST_BITS-PASS1_BITS+2); 3259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Pass 2: process 2 rows from work array, store into output array. */ 3289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr = workspace; 3309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (ctr = 0; ctr < 2; ctr++) { 3319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr = output_buf[ctr] + output_col; 3329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* It's not clear whether a zero row test is worthwhile here ... */ 3339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifndef NO_ZERO_ROW_TEST 3359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (wsptr[1] == 0 && wsptr[3] == 0 && wsptr[5] == 0 && wsptr[7] == 0) { 3369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* AC terms all zero */ 3379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPLE dcval = range_limit[(int) DESCALE((INT32) wsptr[0], PASS1_BITS+3) 3389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project & RANGE_MASK]; 3399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[0] = dcval; 3419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[1] = dcval; 3429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr += DCTSIZE; /* advance pointer to next row */ 3449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project continue; 3459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 3479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Even part */ 3499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp10 = ((INT32) wsptr[0]) << (CONST_BITS+2); 3519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Odd part */ 3539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tmp0 = MULTIPLY((INT32) wsptr[7], - FIX_0_720959822) /* sqrt(2) * (c7-c5+c3-c1) */ 3559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project + MULTIPLY((INT32) wsptr[5], FIX_0_850430095) /* sqrt(2) * (-c1+c3+c5+c7) */ 3569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project + MULTIPLY((INT32) wsptr[3], - FIX_1_272758580) /* sqrt(2) * (-c1+c3-c5-c7) */ 3579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project + MULTIPLY((INT32) wsptr[1], FIX_3_624509785); /* sqrt(2) * (c1+c3+c5+c7) */ 3589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Final output stage */ 3609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[0] = range_limit[(int) DESCALE(tmp10 + tmp0, 3629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project CONST_BITS+PASS1_BITS+3+2) 3639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project & RANGE_MASK]; 3649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project outptr[1] = range_limit[(int) DESCALE(tmp10 - tmp0, 3659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project CONST_BITS+PASS1_BITS+3+2) 3669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project & RANGE_MASK]; 3679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project wsptr += DCTSIZE; /* advance pointer to next row */ 3699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 3719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 3749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Perform dequantization and inverse DCT on one block of coefficients, 3759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * producing a reduced-size 1x1 output block. 3769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 3779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectGLOBAL(void) 3799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectjpeg_idct_1x1 (j_decompress_ptr cinfo, jpeg_component_info * compptr, 3809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JCOEFPTR coef_block, 3819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPARRAY output_buf, JDIMENSION output_col) 3829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 3839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int dcval; 3849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ISLOW_MULT_TYPE * quantptr; 3859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPLE *range_limit = IDCT_range_limit(cinfo); 3869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project SHIFT_TEMPS 3879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* We hardly need an inverse DCT routine for this: just take the 3899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * average pixel value, which is one-eighth of the DC coefficient. 3909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 3919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; 3929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project dcval = DEQUANTIZE(coef_block[0], quantptr[0]); 3939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project dcval = (int) DESCALE((INT32) dcval, 3); 3949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project output_buf[0][output_col] = range_limit[dcval & RANGE_MASK]; 3969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 3979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif /* IDCT_SCALING_SUPPORTED */ 399