170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * jidctint.c 370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Copyright (C) 1991-1998, Thomas G. Lane. 570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * This file is part of the Independent JPEG Group's software. 670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * For conditions of distribution and use, see the accompanying README file. 770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * This file contains a slow-but-accurate integer implementation of the 970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * inverse DCT (Discrete Cosine Transform). In the IJG code, this routine 1070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * must also perform dequantization of the input coefficients. 1170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 1270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * A 2-D IDCT can be done by 1-D IDCT on each column followed by 1-D IDCT 1370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * on each row (or vice versa, but it's more convenient to emit a row at 1470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * a time). Direct algorithms are also available, but they are much more 1570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * complex and seem not to be any faster when reduced to code. 1670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 1770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * This implementation is based on an algorithm described in 1870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * C. Loeffler, A. Ligtenberg and G. Moschytz, "Practical Fast 1-D DCT 1970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Algorithms with 11 Multiplications", Proc. Int'l. Conf. on Acoustics, 2070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Speech, and Signal Processing 1989 (ICASSP '89), pp. 988-991. 2170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * The primary algorithm described there uses 11 multiplies and 29 adds. 2270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * We use their alternate method with 12 multiplies and 32 adds. 2370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * The advantage of this method is that no data path contains more than one 2470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * multiplication; this allows a very simple and accurate implementation in 2570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * scaled fixed-point arithmetic, with a minimal number of shifts. 2670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 2770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 2870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define JPEG_INTERNALS 2970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#include "jinclude.h" 3070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#include "jpeglib.h" 3170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#include "jdct.h" /* Private declarations for DCT subsystem */ 3270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 3370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#ifdef DCT_ISLOW_SUPPORTED 3470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 3570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 3670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 3770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * This module is specialized to the case DCTSIZE = 8. 3870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 3970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 4070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#if DCTSIZE != 8 4170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine Sorry, this code only copes with 8x8 DCTs. /* deliberate syntax err */ 4270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#endif 4370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 4470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 4570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 4670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * The poop on this scaling stuff is as follows: 4770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 4870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Each 1-D IDCT step produces outputs which are a factor of sqrt(N) 4970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * larger than the true IDCT outputs. The final outputs are therefore 5070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * a factor of N larger than desired; since N=8 this can be cured by 5170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * a simple right shift at the end of the algorithm. The advantage of 5270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * this arrangement is that we save two multiplications per 1-D IDCT, 5370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * because the y0 and y4 inputs need not be divided by sqrt(N). 5470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 5570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * We have to do addition and subtraction of the integer inputs, which 5670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * is no problem, and multiplication by fractional constants, which is 5770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * a problem to do in integer arithmetic. We multiply all the constants 5870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * by CONST_SCALE and convert them to integer constants (thus retaining 5970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * CONST_BITS bits of precision in the constants). After doing a 6070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * multiplication we have to divide the product by CONST_SCALE, with proper 6170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * rounding, to produce the correct output. This division can be done 6270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * cheaply as a right shift of CONST_BITS bits. We postpone shifting 6370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * as long as possible so that partial sums can be added together with 6470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * full fractional precision. 6570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 6670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * The outputs of the first pass are scaled up by PASS1_BITS bits so that 6770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * they are represented to better-than-integral precision. These outputs 6870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * require BITS_IN_JSAMPLE + PASS1_BITS + 3 bits; this fits in a 16-bit word 6970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * with the recommended scaling. (To scale up 12-bit sample data further, an 7070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * intermediate INT32 array would be needed.) 7170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 7270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * To avoid overflow of the 32-bit intermediate results in pass 2, we must 7370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * have BITS_IN_JSAMPLE + CONST_BITS + PASS1_BITS <= 26. Error analysis 7470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * shows that the values given below are the most effective. 7570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 7670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 7770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#if BITS_IN_JSAMPLE == 8 7870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define CONST_BITS 13 7970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define PASS1_BITS 2 8070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#else 8170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define CONST_BITS 13 8270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define PASS1_BITS 1 /* lose a little precision to avoid overflow */ 8370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#endif 8470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 8570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* Some C compilers fail to reduce "FIX(constant)" at compile time, thus 8670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * causing a lot of useless floating-point operations at run time. 8770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * To get around this we use the following pre-calculated constants. 8870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * If you change CONST_BITS you may want to add appropriate values. 8970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * (With a reasonable C compiler, you can just rely on the FIX() macro...) 9070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 9170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 9270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#if CONST_BITS == 13 9370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define FIX_0_298631336 ((INT32) 2446) /* FIX(0.298631336) */ 9470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define FIX_0_390180644 ((INT32) 3196) /* FIX(0.390180644) */ 9570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define FIX_0_541196100 ((INT32) 4433) /* FIX(0.541196100) */ 9670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define FIX_0_765366865 ((INT32) 6270) /* FIX(0.765366865) */ 9770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define FIX_0_899976223 ((INT32) 7373) /* FIX(0.899976223) */ 9870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define FIX_1_175875602 ((INT32) 9633) /* FIX(1.175875602) */ 9970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define FIX_1_501321110 ((INT32) 12299) /* FIX(1.501321110) */ 10070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define FIX_1_847759065 ((INT32) 15137) /* FIX(1.847759065) */ 10170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define FIX_1_961570560 ((INT32) 16069) /* FIX(1.961570560) */ 10270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define FIX_2_053119869 ((INT32) 16819) /* FIX(2.053119869) */ 10370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define FIX_2_562915447 ((INT32) 20995) /* FIX(2.562915447) */ 10470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define FIX_3_072711026 ((INT32) 25172) /* FIX(3.072711026) */ 10570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#else 10670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define FIX_0_298631336 FIX(0.298631336) 10770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define FIX_0_390180644 FIX(0.390180644) 10870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define FIX_0_541196100 FIX(0.541196100) 10970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define FIX_0_765366865 FIX(0.765366865) 11070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define FIX_0_899976223 FIX(0.899976223) 11170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define FIX_1_175875602 FIX(1.175875602) 11270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define FIX_1_501321110 FIX(1.501321110) 11370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define FIX_1_847759065 FIX(1.847759065) 11470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define FIX_1_961570560 FIX(1.961570560) 11570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define FIX_2_053119869 FIX(2.053119869) 11670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define FIX_2_562915447 FIX(2.562915447) 11770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define FIX_3_072711026 FIX(3.072711026) 11870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#endif 11970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 12070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 12170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* Multiply an INT32 variable by an INT32 constant to yield an INT32 result. 12270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * For 8-bit samples with the recommended scaling, all the variable 12370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * and constant values involved are no more than 16 bits wide, so a 12470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 16x16->32 bit multiply can be used instead of a full 32x32 multiply. 12570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * For 12-bit samples, a full 32-bit multiplication will be needed. 12670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 12770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 12870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#if BITS_IN_JSAMPLE == 8 12970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define MULTIPLY(var,const) MULTIPLY16C16(var,const) 13070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#else 13170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define MULTIPLY(var,const) ((var) * (const)) 13270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#endif 13370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 13470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 13570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* Dequantize a coefficient by multiplying it by the multiplier-table 13670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * entry; produce an int result. In this module, both inputs and result 13770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * are 16 bits or less, so either int or short multiply will work. 13870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 13970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 14070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define DEQUANTIZE(coef,quantval) (((ISLOW_MULT_TYPE) (coef)) * (quantval)) 14170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 14270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 14370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 14470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Perform dequantization and inverse DCT on one block of coefficients. 14570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 14670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 14770a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineGLOBAL(void) 14870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinejpeg_idct_islow (j_decompress_ptr cinfo, jpeg_component_info * compptr, 14970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine JCOEFPTR coef_block, 15070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine JSAMPARRAY output_buf, JDIMENSION output_col) 15170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 15270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine INT32 tmp0, tmp1, tmp2, tmp3; 15370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine INT32 tmp10, tmp11, tmp12, tmp13; 15470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine INT32 z1, z2, z3, z4, z5; 15570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine JCOEFPTR inptr; 15670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ISLOW_MULT_TYPE * quantptr; 15770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine int * wsptr; 15870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine JSAMPROW outptr; 15970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine JSAMPLE *range_limit = IDCT_range_limit(cinfo); 16070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine int ctr; 16170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine int workspace[DCTSIZE2]; /* buffers data between passes */ 16270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine SHIFT_TEMPS 16370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 16470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Pass 1: process columns from input, store into work array. */ 16570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Note results are scaled up by sqrt(8) compared to a true IDCT; */ 16670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* furthermore, we scale the results by 2**PASS1_BITS. */ 16770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 16870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine inptr = coef_block; 16970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine quantptr = (ISLOW_MULT_TYPE *) compptr->dct_table; 17070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine wsptr = workspace; 17170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine for (ctr = DCTSIZE; ctr > 0; ctr--) { 17270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Due to quantization, we will usually find that many of the input 17370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * coefficients are zero, especially the AC terms. We can exploit this 17470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * by short-circuiting the IDCT calculation for any column in which all 17570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * the AC terms are zero. In that case each output is equal to the 17670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * DC coefficient (with scale factor as needed). 17770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * With typical images and quantization tables, half or more of the 17870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * column DCT calculations can be simplified this way. 17970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 18070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 18170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (inptr[DCTSIZE*1] == 0 && inptr[DCTSIZE*2] == 0 && 18270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine inptr[DCTSIZE*3] == 0 && inptr[DCTSIZE*4] == 0 && 18370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine inptr[DCTSIZE*5] == 0 && inptr[DCTSIZE*6] == 0 && 18470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine inptr[DCTSIZE*7] == 0) { 18570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* AC terms all zero */ 18670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine int dcval = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]) << PASS1_BITS; 18770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 18870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine wsptr[DCTSIZE*0] = dcval; 18970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine wsptr[DCTSIZE*1] = dcval; 19070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine wsptr[DCTSIZE*2] = dcval; 19170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine wsptr[DCTSIZE*3] = dcval; 19270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine wsptr[DCTSIZE*4] = dcval; 19370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine wsptr[DCTSIZE*5] = dcval; 19470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine wsptr[DCTSIZE*6] = dcval; 19570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine wsptr[DCTSIZE*7] = dcval; 19670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 19770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine inptr++; /* advance pointers to next column */ 19870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine quantptr++; 19970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine wsptr++; 20070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine continue; 20170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 20270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 20370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Even part: reverse the even part of the forward DCT. */ 20470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* The rotator is sqrt(2)*c(-6). */ 20570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 20670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine z2 = DEQUANTIZE(inptr[DCTSIZE*2], quantptr[DCTSIZE*2]); 20770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine z3 = DEQUANTIZE(inptr[DCTSIZE*6], quantptr[DCTSIZE*6]); 20870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 20970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine z1 = MULTIPLY(z2 + z3, FIX_0_541196100); 21070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp2 = z1 + MULTIPLY(z3, - FIX_1_847759065); 21170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp3 = z1 + MULTIPLY(z2, FIX_0_765366865); 21270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 21370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine z2 = DEQUANTIZE(inptr[DCTSIZE*0], quantptr[DCTSIZE*0]); 21470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine z3 = DEQUANTIZE(inptr[DCTSIZE*4], quantptr[DCTSIZE*4]); 21570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 21670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp0 = (z2 + z3) << CONST_BITS; 21770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp1 = (z2 - z3) << CONST_BITS; 21870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 21970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp10 = tmp0 + tmp3; 22070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp13 = tmp0 - tmp3; 22170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp11 = tmp1 + tmp2; 22270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp12 = tmp1 - tmp2; 22370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 22470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Odd part per figure 8; the matrix is unitary and hence its 22570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively. 22670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 22770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 22870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp0 = DEQUANTIZE(inptr[DCTSIZE*7], quantptr[DCTSIZE*7]); 22970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp1 = DEQUANTIZE(inptr[DCTSIZE*5], quantptr[DCTSIZE*5]); 23070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp2 = DEQUANTIZE(inptr[DCTSIZE*3], quantptr[DCTSIZE*3]); 23170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp3 = DEQUANTIZE(inptr[DCTSIZE*1], quantptr[DCTSIZE*1]); 23270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 23370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine z1 = tmp0 + tmp3; 23470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine z2 = tmp1 + tmp2; 23570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine z3 = tmp0 + tmp2; 23670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine z4 = tmp1 + tmp3; 23770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine z5 = MULTIPLY(z3 + z4, FIX_1_175875602); /* sqrt(2) * c3 */ 23870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 23970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp0 = MULTIPLY(tmp0, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */ 24070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp1 = MULTIPLY(tmp1, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */ 24170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp2 = MULTIPLY(tmp2, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */ 24270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp3 = MULTIPLY(tmp3, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */ 24370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine z1 = MULTIPLY(z1, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */ 24470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine z2 = MULTIPLY(z2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */ 24570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine z3 = MULTIPLY(z3, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */ 24670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine z4 = MULTIPLY(z4, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */ 24770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 24870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine z3 += z5; 24970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine z4 += z5; 25070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 25170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp0 += z1 + z3; 25270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp1 += z2 + z4; 25370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp2 += z2 + z3; 25470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp3 += z1 + z4; 25570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 25670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */ 25770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 25870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine wsptr[DCTSIZE*0] = (int) DESCALE(tmp10 + tmp3, CONST_BITS-PASS1_BITS); 25970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine wsptr[DCTSIZE*7] = (int) DESCALE(tmp10 - tmp3, CONST_BITS-PASS1_BITS); 26070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine wsptr[DCTSIZE*1] = (int) DESCALE(tmp11 + tmp2, CONST_BITS-PASS1_BITS); 26170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine wsptr[DCTSIZE*6] = (int) DESCALE(tmp11 - tmp2, CONST_BITS-PASS1_BITS); 26270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine wsptr[DCTSIZE*2] = (int) DESCALE(tmp12 + tmp1, CONST_BITS-PASS1_BITS); 26370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine wsptr[DCTSIZE*5] = (int) DESCALE(tmp12 - tmp1, CONST_BITS-PASS1_BITS); 26470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine wsptr[DCTSIZE*3] = (int) DESCALE(tmp13 + tmp0, CONST_BITS-PASS1_BITS); 26570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine wsptr[DCTSIZE*4] = (int) DESCALE(tmp13 - tmp0, CONST_BITS-PASS1_BITS); 26670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 26770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine inptr++; /* advance pointers to next column */ 26870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine quantptr++; 26970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine wsptr++; 27070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 27170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 27270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Pass 2: process rows from work array, store into output array. */ 27370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Note that we must descale the results by a factor of 8 == 2**3, */ 27470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* and also undo the PASS1_BITS scaling. */ 27570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 27670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine wsptr = workspace; 27770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine for (ctr = 0; ctr < DCTSIZE; ctr++) { 27870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine outptr = output_buf[ctr] + output_col; 27970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Rows of zeroes can be exploited in the same way as we did with columns. 28070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * However, the column calculation has created many nonzero AC terms, so 28170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * the simplification applies less often (typically 5% to 10% of the time). 28270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * On machines with very fast multiplication, it's possible that the 28370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * test takes more time than it's worth. In that case this section 28470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * may be commented out. 28570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 28670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 28770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#ifndef NO_ZERO_ROW_TEST 28870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (wsptr[1] == 0 && wsptr[2] == 0 && wsptr[3] == 0 && wsptr[4] == 0 && 28970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine wsptr[5] == 0 && wsptr[6] == 0 && wsptr[7] == 0) { 29070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* AC terms all zero */ 29170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine JSAMPLE dcval = range_limit[(int) DESCALE((INT32) wsptr[0], PASS1_BITS+3) 29270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine & RANGE_MASK]; 29370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 29470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine outptr[0] = dcval; 29570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine outptr[1] = dcval; 29670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine outptr[2] = dcval; 29770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine outptr[3] = dcval; 29870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine outptr[4] = dcval; 29970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine outptr[5] = dcval; 30070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine outptr[6] = dcval; 30170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine outptr[7] = dcval; 30270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 30370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine wsptr += DCTSIZE; /* advance pointer to next row */ 30470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine continue; 30570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 30670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#endif 30770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 30870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Even part: reverse the even part of the forward DCT. */ 30970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* The rotator is sqrt(2)*c(-6). */ 31070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 31170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine z2 = (INT32) wsptr[2]; 31270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine z3 = (INT32) wsptr[6]; 31370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 31470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine z1 = MULTIPLY(z2 + z3, FIX_0_541196100); 31570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp2 = z1 + MULTIPLY(z3, - FIX_1_847759065); 31670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp3 = z1 + MULTIPLY(z2, FIX_0_765366865); 31770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 31870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp0 = ((INT32) wsptr[0] + (INT32) wsptr[4]) << CONST_BITS; 31970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp1 = ((INT32) wsptr[0] - (INT32) wsptr[4]) << CONST_BITS; 32070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 32170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp10 = tmp0 + tmp3; 32270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp13 = tmp0 - tmp3; 32370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp11 = tmp1 + tmp2; 32470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp12 = tmp1 - tmp2; 32570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 32670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Odd part per figure 8; the matrix is unitary and hence its 32770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively. 32870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 32970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 33070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp0 = (INT32) wsptr[7]; 33170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp1 = (INT32) wsptr[5]; 33270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp2 = (INT32) wsptr[3]; 33370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp3 = (INT32) wsptr[1]; 33470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 33570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine z1 = tmp0 + tmp3; 33670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine z2 = tmp1 + tmp2; 33770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine z3 = tmp0 + tmp2; 33870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine z4 = tmp1 + tmp3; 33970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine z5 = MULTIPLY(z3 + z4, FIX_1_175875602); /* sqrt(2) * c3 */ 34070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 34170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp0 = MULTIPLY(tmp0, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */ 34270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp1 = MULTIPLY(tmp1, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */ 34370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp2 = MULTIPLY(tmp2, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */ 34470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp3 = MULTIPLY(tmp3, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */ 34570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine z1 = MULTIPLY(z1, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */ 34670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine z2 = MULTIPLY(z2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */ 34770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine z3 = MULTIPLY(z3, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */ 34870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine z4 = MULTIPLY(z4, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */ 34970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 35070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine z3 += z5; 35170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine z4 += z5; 35270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 35370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp0 += z1 + z3; 35470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp1 += z2 + z4; 35570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp2 += z2 + z3; 35670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tmp3 += z1 + z4; 35770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 35870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */ 35970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 36070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine outptr[0] = range_limit[(int) DESCALE(tmp10 + tmp3, 36170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine CONST_BITS+PASS1_BITS+3) 36270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine & RANGE_MASK]; 36370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine outptr[7] = range_limit[(int) DESCALE(tmp10 - tmp3, 36470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine CONST_BITS+PASS1_BITS+3) 36570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine & RANGE_MASK]; 36670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine outptr[1] = range_limit[(int) DESCALE(tmp11 + tmp2, 36770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine CONST_BITS+PASS1_BITS+3) 36870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine & RANGE_MASK]; 36970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine outptr[6] = range_limit[(int) DESCALE(tmp11 - tmp2, 37070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine CONST_BITS+PASS1_BITS+3) 37170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine & RANGE_MASK]; 37270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine outptr[2] = range_limit[(int) DESCALE(tmp12 + tmp1, 37370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine CONST_BITS+PASS1_BITS+3) 37470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine & RANGE_MASK]; 37570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine outptr[5] = range_limit[(int) DESCALE(tmp12 - tmp1, 37670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine CONST_BITS+PASS1_BITS+3) 37770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine & RANGE_MASK]; 37870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine outptr[3] = range_limit[(int) DESCALE(tmp13 + tmp0, 37970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine CONST_BITS+PASS1_BITS+3) 38070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine & RANGE_MASK]; 38170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine outptr[4] = range_limit[(int) DESCALE(tmp13 - tmp0, 38270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine CONST_BITS+PASS1_BITS+3) 38370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine & RANGE_MASK]; 38470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 38570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine wsptr += DCTSIZE; /* advance pointer to next row */ 38670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 38770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 38870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 38970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#endif /* DCT_ISLOW_SUPPORTED */ 390