kc3-lang/libjpeg-turbo/src/jidctint.c
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Hash : e69dd40c
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Date : 2024-01-23T13:26:41
Reorganize source to make things easier to find - Move all libjpeg documentation, except for README.ijg, into the doc/ subdirectory. - Move the TurboJPEG C API documentation from doc/html/ into doc/turbojpeg/. - Move all C source code and headers into a src/ subdirectory. - Move turbojpeg-jni.c into the java/ subdirectory. Referring to #226, there is no ideal solution to this problem. A semantically ideal solution would have involved placing all source code, including the SIMD and Java source code, under src/ (or perhaps placing C library source code under lib/ and C test program source code under test/), all header files under include/, and all documentation under doc/. However: - To me it makes more sense to have separate top-level directories for each language, since the SIMD extensions and the Java API are technically optional features. src/ now contains only the code that is relevant to the core C API libraries and associated programs. - I didn't want to bury the java/ and simd/ directories or add a level of depth to them, since both directories already contain source code that is 3-4 levels deep. - I would prefer not to separate the header files from the C source code, because: 1. It would be disruptive. libjpeg and libjpeg-turbo have historically placed C source code and headers in the same directory, and people who are familiar with both projects (self included) are used to looking for the headers in the same directory as the C source code. 2. In terms of how the headers are used internally in libjpeg-turbo, the distinction between public and private headers is a bit fuzzy. - It didn't make sense to separate the test source code from the library source code, since there is not a clear distinction in some cases. (For instance, the IJG image I/O functions are used by cjpeg and djpeg as well as by the TurboJPEG API.) This solution is minimally disruptive, since it keeps all C source code and headers together and keeps java/ and simd/ as top-level directories. It is a bit awkward, because java/ and simd/ technically contain source code, even though they are not under src/. However, other solutions would have been more awkward for different reasons. Closes #226
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src/jidctint.c
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/* * jidctint.c * * This file was part of the Independent JPEG Group's software: * Copyright (C) 1991-1998, Thomas G. Lane. * Modification developed 2002-2018 by Guido Vollbeding. * libjpeg-turbo Modifications: * Copyright (C) 2015, 2020, 2022, D. R. Commander. * For conditions of distribution and use, see the accompanying README.ijg * file. * * This file contains a slower but more accurate integer implementation of the * inverse DCT (Discrete Cosine Transform). In the IJG code, this routine * must also perform dequantization of the input coefficients. * * A 2-D IDCT can be done by 1-D IDCT on each column followed by 1-D IDCT * on each row (or vice versa, but it's more convenient to emit a row at * a time). Direct algorithms are also available, but they are much more * complex and seem not to be any faster when reduced to code. * * This implementation is based on an algorithm described in * C. Loeffler, A. Ligtenberg and G. Moschytz, "Practical Fast 1-D DCT * Algorithms with 11 Multiplications", Proc. Int'l. Conf. on Acoustics, * Speech, and Signal Processing 1989 (ICASSP '89), pp. 988-991. * The primary algorithm described there uses 11 multiplies and 29 adds. * We use their alternate method with 12 multiplies and 32 adds. * The advantage of this method is that no data path contains more than one * multiplication; this allows a very simple and accurate implementation in * scaled fixed-point arithmetic, with a minimal number of shifts. * * We also provide IDCT routines with various output sample block sizes for * direct resolution reduction or enlargement without additional resampling: * NxN (N=1...16) pixels for one 8x8 input DCT block. * * For N<8 we simply take the corresponding low-frequency coefficients of * the 8x8 input DCT block and apply an NxN point IDCT on the sub-block * to yield the downscaled outputs. * This can be seen as direct low-pass downsampling from the DCT domain * point of view rather than the usual spatial domain point of view, * yielding significant computational savings and results at least * as good as common bilinear (averaging) spatial downsampling. * * For N>8 we apply a partial NxN IDCT on the 8 input coefficients as * lower frequencies and higher frequencies assumed to be zero. * It turns out that the computational effort is similar to the 8x8 IDCT * regarding the output size. * Furthermore, the scaling and descaling is the same for all IDCT sizes. * * CAUTION: We rely on the FIX() macro except for the N=1,2,4,8 cases * since there would be too many additional constants to pre-calculate. */ #define JPEG_INTERNALS #include "jinclude.h" #include "jpeglib.h" #include "jdct.h" /* Private declarations for DCT subsystem */ #ifdef DCT_ISLOW_SUPPORTED /* * This module is specialized to the case DCTSIZE = 8. */ #if DCTSIZE != 8 Sorry, this code only copes with 8x8 DCT blocks. /* deliberate syntax err */ #endif /* * The poop on this scaling stuff is as follows: * * Each 1-D IDCT step produces outputs which are a factor of sqrt(N) * larger than the true IDCT outputs. The final outputs are therefore * a factor of N larger than desired; since N=8 this can be cured by * a simple right shift at the end of the algorithm. The advantage of * this arrangement is that we save two multiplications per 1-D IDCT, * because the y0 and y4 inputs need not be divided by sqrt(N). * * We have to do addition and subtraction of the integer inputs, which * is no problem, and multiplication by fractional constants, which is * a problem to do in integer arithmetic. We multiply all the constants * by CONST_SCALE and convert them to integer constants (thus retaining * CONST_BITS bits of precision in the constants). After doing a * multiplication we have to divide the product by CONST_SCALE, with proper * rounding, to produce the correct output. This division can be done * cheaply as a right shift of CONST_BITS bits. We postpone shifting * as long as possible so that partial sums can be added together with * full fractional precision. * * The outputs of the first pass are scaled up by PASS1_BITS bits so that * they are represented to better-than-integral precision. These outputs * require BITS_IN_JSAMPLE + PASS1_BITS + 3 bits; this fits in a 16-bit word * with the recommended scaling. (To scale up 12-bit sample data further, an * intermediate JLONG array would be needed.) * * To avoid overflow of the 32-bit intermediate results in pass 2, we must * have BITS_IN_JSAMPLE + CONST_BITS + PASS1_BITS <= 26. Error analysis * shows that the values given below are the most effective. */ #if BITS_IN_JSAMPLE == 8 #define CONST_BITS 13 #define PASS1_BITS 2 #else #define CONST_BITS 13 #define PASS1_BITS 1 /* lose a little precision to avoid overflow */ #endif /* Some C compilers fail to reduce "FIX(constant)" at compile time, thus * causing a lot of useless floating-point operations at run time. * To get around this we use the following pre-calculated constants. * If you change CONST_BITS you may want to add appropriate values. * (With a reasonable C compiler, you can just rely on the FIX() macro...) */ #if CONST_BITS == 13 #define FIX_0_298631336 ((JLONG)2446) /* FIX(0.298631336) */ #define FIX_0_390180644 ((JLONG)3196) /* FIX(0.390180644) */ #define FIX_0_541196100 ((JLONG)4433) /* FIX(0.541196100) */ #define FIX_0_765366865 ((JLONG)6270) /* FIX(0.765366865) */ #define FIX_0_899976223 ((JLONG)7373) /* FIX(0.899976223) */ #define FIX_1_175875602 ((JLONG)9633) /* FIX(1.175875602) */ #define FIX_1_501321110 ((JLONG)12299) /* FIX(1.501321110) */ #define FIX_1_847759065 ((JLONG)15137) /* FIX(1.847759065) */ #define FIX_1_961570560 ((JLONG)16069) /* FIX(1.961570560) */ #define FIX_2_053119869 ((JLONG)16819) /* FIX(2.053119869) */ #define FIX_2_562915447 ((JLONG)20995) /* FIX(2.562915447) */ #define FIX_3_072711026 ((JLONG)25172) /* FIX(3.072711026) */ #else #define FIX_0_298631336 FIX(0.298631336) #define FIX_0_390180644 FIX(0.390180644) #define FIX_0_541196100 FIX(0.541196100) #define FIX_0_765366865 FIX(0.765366865) #define FIX_0_899976223 FIX(0.899976223) #define FIX_1_175875602 FIX(1.175875602) #define FIX_1_501321110 FIX(1.501321110) #define FIX_1_847759065 FIX(1.847759065) #define FIX_1_961570560 FIX(1.961570560) #define FIX_2_053119869 FIX(2.053119869) #define FIX_2_562915447 FIX(2.562915447) #define FIX_3_072711026 FIX(3.072711026) #endif /* Multiply an JLONG variable by an JLONG constant to yield an JLONG result. * For 8-bit samples with the recommended scaling, all the variable * and constant values involved are no more than 16 bits wide, so a * 16x16->32 bit multiply can be used instead of a full 32x32 multiply. * For 12-bit samples, a full 32-bit multiplication will be needed. */ #if BITS_IN_JSAMPLE == 8 #define MULTIPLY(var, const) MULTIPLY16C16(var, const) #else #define MULTIPLY(var, const) ((var) * (const)) #endif /* Dequantize a coefficient by multiplying it by the multiplier-table * entry; produce an int result. In this module, both inputs and result * are 16 bits or less, so either int or short multiply will work. */ #define DEQUANTIZE(coef, quantval) (((ISLOW_MULT_TYPE)(coef)) * (quantval)) /* * Perform dequantization and inverse DCT on one block of coefficients. */ GLOBAL(void) _jpeg_idct_islow(j_decompress_ptr cinfo, jpeg_component_info *compptr, JCOEFPTR coef_block, _JSAMPARRAY output_buf, JDIMENSION output_col) { JLONG tmp0, tmp1, tmp2, tmp3; JLONG tmp10, tmp11, tmp12, tmp13; JLONG z1, z2, z3, z4, z5; JCOEFPTR inptr; ISLOW_MULT_TYPE *quantptr; int *wsptr; _JSAMPROW outptr; _JSAMPLE *range_limit = IDCT_range_limit(cinfo); int ctr; int workspace[DCTSIZE2]; /* buffers data between passes */ SHIFT_TEMPS /* Pass 1: process columns from input, store into work array. */ /* Note results are scaled up by sqrt(8) compared to a true IDCT; */ /* furthermore, we scale the results by 2**PASS1_BITS. */ inptr = coef_block; quantptr = (ISLOW_MULT_TYPE *)compptr->dct_table; wsptr = workspace; for (ctr = DCTSIZE; ctr > 0; ctr--) { /* Due to quantization, we will usually find that many of the input * coefficients are zero, especially the AC terms. We can exploit this * by short-circuiting the IDCT calculation for any column in which all * the AC terms are zero. In that case each output is equal to the * DC coefficient (with scale factor as needed). * With typical images and quantization tables, half or more of the * column DCT calculations can be simplified this way. */ if (inptr[DCTSIZE * 1] == 0 && inptr[DCTSIZE * 2] == 0 && inptr[DCTSIZE * 3] == 0 && inptr[DCTSIZE * 4] == 0 && inptr[DCTSIZE * 5] == 0 && inptr[DCTSIZE * 6] == 0 && inptr[DCTSIZE * 7] == 0) { /* AC terms all zero */ int dcval = LEFT_SHIFT(DEQUANTIZE(inptr[DCTSIZE * 0], quantptr[DCTSIZE * 0]), PASS1_BITS); wsptr[DCTSIZE * 0] = dcval; wsptr[DCTSIZE * 1] = dcval; wsptr[DCTSIZE * 2] = dcval; wsptr[DCTSIZE * 3] = dcval; wsptr[DCTSIZE * 4] = dcval; wsptr[DCTSIZE * 5] = dcval; wsptr[DCTSIZE * 6] = dcval; wsptr[DCTSIZE * 7] = dcval; inptr++; /* advance pointers to next column */ quantptr++; wsptr++; continue; } /* Even part: reverse the even part of the forward DCT. */ /* The rotator is sqrt(2)*c(-6). */ z2 = DEQUANTIZE(inptr[DCTSIZE * 2], quantptr[DCTSIZE * 2]); z3 = DEQUANTIZE(inptr[DCTSIZE * 6], quantptr[DCTSIZE * 6]); z1 = MULTIPLY(z2 + z3, FIX_0_541196100); tmp2 = z1 + MULTIPLY(z3, -FIX_1_847759065); tmp3 = z1 + MULTIPLY(z2, FIX_0_765366865); z2 = DEQUANTIZE(inptr[DCTSIZE * 0], quantptr[DCTSIZE * 0]); z3 = DEQUANTIZE(inptr[DCTSIZE * 4], quantptr[DCTSIZE * 4]); tmp0 = LEFT_SHIFT(z2 + z3, CONST_BITS); tmp1 = LEFT_SHIFT(z2 - z3, CONST_BITS); tmp10 = tmp0 + tmp3; tmp13 = tmp0 - tmp3; tmp11 = tmp1 + tmp2; tmp12 = tmp1 - tmp2; /* Odd part per figure 8; the matrix is unitary and hence its * transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively. */ tmp0 = DEQUANTIZE(inptr[DCTSIZE * 7], quantptr[DCTSIZE * 7]); tmp1 = DEQUANTIZE(inptr[DCTSIZE * 5], quantptr[DCTSIZE * 5]); tmp2 = DEQUANTIZE(inptr[DCTSIZE * 3], quantptr[DCTSIZE * 3]); tmp3 = DEQUANTIZE(inptr[DCTSIZE * 1], quantptr[DCTSIZE * 1]); z1 = tmp0 + tmp3; z2 = tmp1 + tmp2; z3 = tmp0 + tmp2; z4 = tmp1 + tmp3; z5 = MULTIPLY(z3 + z4, FIX_1_175875602); /* sqrt(2) * c3 */ tmp0 = MULTIPLY(tmp0, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */ tmp1 = MULTIPLY(tmp1, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */ tmp2 = MULTIPLY(tmp2, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */ tmp3 = MULTIPLY(tmp3, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */ z1 = MULTIPLY(z1, -FIX_0_899976223); /* sqrt(2) * ( c7-c3) */ z2 = MULTIPLY(z2, -FIX_2_562915447); /* sqrt(2) * (-c1-c3) */ z3 = MULTIPLY(z3, -FIX_1_961570560); /* sqrt(2) * (-c3-c5) */ z4 = MULTIPLY(z4, -FIX_0_390180644); /* sqrt(2) * ( c5-c3) */ z3 += z5; z4 += z5; tmp0 += z1 + z3; tmp1 += z2 + z4; tmp2 += z2 + z3; tmp3 += z1 + z4; /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */ wsptr[DCTSIZE * 0] = (int)DESCALE(tmp10 + tmp3, CONST_BITS - PASS1_BITS); wsptr[DCTSIZE * 7] = (int)DESCALE(tmp10 - tmp3, CONST_BITS - PASS1_BITS); wsptr[DCTSIZE * 1] = (int)DESCALE(tmp11 + tmp2, CONST_BITS - PASS1_BITS); wsptr[DCTSIZE * 6] = (int)DESCALE(tmp11 - tmp2, CONST_BITS - PASS1_BITS); wsptr[DCTSIZE * 2] = (int)DESCALE(tmp12 + tmp1, CONST_BITS - PASS1_BITS); wsptr[DCTSIZE * 5] = (int)DESCALE(tmp12 - tmp1, CONST_BITS - PASS1_BITS); wsptr[DCTSIZE * 3] = (int)DESCALE(tmp13 + tmp0, CONST_BITS - PASS1_BITS); wsptr[DCTSIZE * 4] = (int)DESCALE(tmp13 - tmp0, CONST_BITS - PASS1_BITS); inptr++; /* advance pointers to next column */ quantptr++; wsptr++; } /* Pass 2: process rows from work array, store into output array. */ /* Note that we must descale the results by a factor of 8 == 2**3, */ /* and also undo the PASS1_BITS scaling. */ wsptr = workspace; for (ctr = 0; ctr < DCTSIZE; ctr++) { outptr = output_buf[ctr] + output_col; /* Rows of zeroes can be exploited in the same way as we did with columns. * However, the column calculation has created many nonzero AC terms, so * the simplification applies less often (typically 5% to 10% of the time). * On machines with very fast multiplication, it's possible that the * test takes more time than it's worth. In that case this section * may be commented out. */ #ifndef NO_ZERO_ROW_TEST if (wsptr[1] == 0 && wsptr[2] == 0 && wsptr[3] == 0 && wsptr[4] == 0 && wsptr[5] == 0 && wsptr[6] == 0 && wsptr[7] == 0) { /* AC terms all zero */ _JSAMPLE dcval = range_limit[(int)DESCALE((JLONG)wsptr[0], PASS1_BITS + 3) & RANGE_MASK]; outptr[0] = dcval; outptr[1] = dcval; outptr[2] = dcval; outptr[3] = dcval; outptr[4] = dcval; outptr[5] = dcval; outptr[6] = dcval; outptr[7] = dcval; wsptr += DCTSIZE; /* advance pointer to next row */ continue; } #endif /* Even part: reverse the even part of the forward DCT. */ /* The rotator is sqrt(2)*c(-6). */ z2 = (JLONG)wsptr[2]; z3 = (JLONG)wsptr[6]; z1 = MULTIPLY(z2 + z3, FIX_0_541196100); tmp2 = z1 + MULTIPLY(z3, -FIX_1_847759065); tmp3 = z1 + MULTIPLY(z2, FIX_0_765366865); tmp0 = LEFT_SHIFT((JLONG)wsptr[0] + (JLONG)wsptr[4], CONST_BITS); tmp1 = LEFT_SHIFT((JLONG)wsptr[0] - (JLONG)wsptr[4], CONST_BITS); tmp10 = tmp0 + tmp3; tmp13 = tmp0 - tmp3; tmp11 = tmp1 + tmp2; tmp12 = tmp1 - tmp2; /* Odd part per figure 8; the matrix is unitary and hence its * transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively. */ tmp0 = (JLONG)wsptr[7]; tmp1 = (JLONG)wsptr[5]; tmp2 = (JLONG)wsptr[3]; tmp3 = (JLONG)wsptr[1]; z1 = tmp0 + tmp3; z2 = tmp1 + tmp2; z3 = tmp0 + tmp2; z4 = tmp1 + tmp3; z5 = MULTIPLY(z3 + z4, FIX_1_175875602); /* sqrt(2) * c3 */ tmp0 = MULTIPLY(tmp0, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */ tmp1 = MULTIPLY(tmp1, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */ tmp2 = MULTIPLY(tmp2, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */ tmp3 = MULTIPLY(tmp3, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */ z1 = MULTIPLY(z1, -FIX_0_899976223); /* sqrt(2) * ( c7-c3) */ z2 = MULTIPLY(z2, -FIX_2_562915447); /* sqrt(2) * (-c1-c3) */ z3 = MULTIPLY(z3, -FIX_1_961570560); /* sqrt(2) * (-c3-c5) */ z4 = MULTIPLY(z4, -FIX_0_390180644); /* sqrt(2) * ( c5-c3) */ z3 += z5; z4 += z5; tmp0 += z1 + z3; tmp1 += z2 + z4; tmp2 += z2 + z3; tmp3 += z1 + z4; /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */ outptr[0] = range_limit[(int)DESCALE(tmp10 + tmp3, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[7] = range_limit[(int)DESCALE(tmp10 - tmp3, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[1] = range_limit[(int)DESCALE(tmp11 + tmp2, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[6] = range_limit[(int)DESCALE(tmp11 - tmp2, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[2] = range_limit[(int)DESCALE(tmp12 + tmp1, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[5] = range_limit[(int)DESCALE(tmp12 - tmp1, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[3] = range_limit[(int)DESCALE(tmp13 + tmp0, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[4] = range_limit[(int)DESCALE(tmp13 - tmp0, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; wsptr += DCTSIZE; /* advance pointer to next row */ } } #ifdef IDCT_SCALING_SUPPORTED /* * Perform dequantization and inverse DCT on one block of coefficients, * producing a reduced-size 7x7 output block. * * Optimized algorithm with 12 multiplications in the 1-D kernel. * cK represents sqrt(2) * cos(K*pi/14). */ GLOBAL(void) _jpeg_idct_7x7(j_decompress_ptr cinfo, jpeg_component_info *compptr, JCOEFPTR coef_block, _JSAMPARRAY output_buf, JDIMENSION output_col) { JLONG tmp0, tmp1, tmp2, tmp10, tmp11, tmp12, tmp13; JLONG z1, z2, z3; JCOEFPTR inptr; ISLOW_MULT_TYPE *quantptr; int *wsptr; _JSAMPROW outptr; _JSAMPLE *range_limit = IDCT_range_limit(cinfo); int ctr; int workspace[7 * 7]; /* buffers data between passes */ SHIFT_TEMPS /* Pass 1: process columns from input, store into work array. */ inptr = coef_block; quantptr = (ISLOW_MULT_TYPE *)compptr->dct_table; wsptr = workspace; for (ctr = 0; ctr < 7; ctr++, inptr++, quantptr++, wsptr++) { /* Even part */ tmp13 = DEQUANTIZE(inptr[DCTSIZE * 0], quantptr[DCTSIZE * 0]); tmp13 = LEFT_SHIFT(tmp13, CONST_BITS); /* Add fudge factor here for final descale. */ tmp13 += ONE << (CONST_BITS - PASS1_BITS - 1); z1 = DEQUANTIZE(inptr[DCTSIZE * 2], quantptr[DCTSIZE * 2]); z2 = DEQUANTIZE(inptr[DCTSIZE * 4], quantptr[DCTSIZE * 4]); z3 = DEQUANTIZE(inptr[DCTSIZE * 6], quantptr[DCTSIZE * 6]); tmp10 = MULTIPLY(z2 - z3, FIX(0.881747734)); /* c4 */ tmp12 = MULTIPLY(z1 - z2, FIX(0.314692123)); /* c6 */ tmp11 = tmp10 + tmp12 + tmp13 - MULTIPLY(z2, FIX(1.841218003)); /* c2+c4-c6 */ tmp0 = z1 + z3; z2 -= tmp0; tmp0 = MULTIPLY(tmp0, FIX(1.274162392)) + tmp13; /* c2 */ tmp10 += tmp0 - MULTIPLY(z3, FIX(0.077722536)); /* c2-c4-c6 */ tmp12 += tmp0 - MULTIPLY(z1, FIX(2.470602249)); /* c2+c4+c6 */ tmp13 += MULTIPLY(z2, FIX(1.414213562)); /* c0 */ /* Odd part */ z1 = DEQUANTIZE(inptr[DCTSIZE * 1], quantptr[DCTSIZE * 1]); z2 = DEQUANTIZE(inptr[DCTSIZE * 3], quantptr[DCTSIZE * 3]); z3 = DEQUANTIZE(inptr[DCTSIZE * 5], quantptr[DCTSIZE * 5]); tmp1 = MULTIPLY(z1 + z2, FIX(0.935414347)); /* (c3+c1-c5)/2 */ tmp2 = MULTIPLY(z1 - z2, FIX(0.170262339)); /* (c3+c5-c1)/2 */ tmp0 = tmp1 - tmp2; tmp1 += tmp2; tmp2 = MULTIPLY(z2 + z3, -FIX(1.378756276)); /* -c1 */ tmp1 += tmp2; z2 = MULTIPLY(z1 + z3, FIX(0.613604268)); /* c5 */ tmp0 += z2; tmp2 += z2 + MULTIPLY(z3, FIX(1.870828693)); /* c3+c1-c5 */ /* Final output stage */ wsptr[7 * 0] = (int)RIGHT_SHIFT(tmp10 + tmp0, CONST_BITS - PASS1_BITS); wsptr[7 * 6] = (int)RIGHT_SHIFT(tmp10 - tmp0, CONST_BITS - PASS1_BITS); wsptr[7 * 1] = (int)RIGHT_SHIFT(tmp11 + tmp1, CONST_BITS - PASS1_BITS); wsptr[7 * 5] = (int)RIGHT_SHIFT(tmp11 - tmp1, CONST_BITS - PASS1_BITS); wsptr[7 * 2] = (int)RIGHT_SHIFT(tmp12 + tmp2, CONST_BITS - PASS1_BITS); wsptr[7 * 4] = (int)RIGHT_SHIFT(tmp12 - tmp2, CONST_BITS - PASS1_BITS); wsptr[7 * 3] = (int)RIGHT_SHIFT(tmp13, CONST_BITS - PASS1_BITS); } /* Pass 2: process 7 rows from work array, store into output array. */ wsptr = workspace; for (ctr = 0; ctr < 7; ctr++) { outptr = output_buf[ctr] + output_col; /* Even part */ /* Add fudge factor here for final descale. */ tmp13 = (JLONG)wsptr[0] + (ONE << (PASS1_BITS + 2)); tmp13 = LEFT_SHIFT(tmp13, CONST_BITS); z1 = (JLONG)wsptr[2]; z2 = (JLONG)wsptr[4]; z3 = (JLONG)wsptr[6]; tmp10 = MULTIPLY(z2 - z3, FIX(0.881747734)); /* c4 */ tmp12 = MULTIPLY(z1 - z2, FIX(0.314692123)); /* c6 */ tmp11 = tmp10 + tmp12 + tmp13 - MULTIPLY(z2, FIX(1.841218003)); /* c2+c4-c6 */ tmp0 = z1 + z3; z2 -= tmp0; tmp0 = MULTIPLY(tmp0, FIX(1.274162392)) + tmp13; /* c2 */ tmp10 += tmp0 - MULTIPLY(z3, FIX(0.077722536)); /* c2-c4-c6 */ tmp12 += tmp0 - MULTIPLY(z1, FIX(2.470602249)); /* c2+c4+c6 */ tmp13 += MULTIPLY(z2, FIX(1.414213562)); /* c0 */ /* Odd part */ z1 = (JLONG)wsptr[1]; z2 = (JLONG)wsptr[3]; z3 = (JLONG)wsptr[5]; tmp1 = MULTIPLY(z1 + z2, FIX(0.935414347)); /* (c3+c1-c5)/2 */ tmp2 = MULTIPLY(z1 - z2, FIX(0.170262339)); /* (c3+c5-c1)/2 */ tmp0 = tmp1 - tmp2; tmp1 += tmp2; tmp2 = MULTIPLY(z2 + z3, -FIX(1.378756276)); /* -c1 */ tmp1 += tmp2; z2 = MULTIPLY(z1 + z3, FIX(0.613604268)); /* c5 */ tmp0 += z2; tmp2 += z2 + MULTIPLY(z3, FIX(1.870828693)); /* c3+c1-c5 */ /* Final output stage */ outptr[0] = range_limit[(int)RIGHT_SHIFT(tmp10 + tmp0, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[6] = range_limit[(int)RIGHT_SHIFT(tmp10 - tmp0, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[1] = range_limit[(int)RIGHT_SHIFT(tmp11 + tmp1, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[5] = range_limit[(int)RIGHT_SHIFT(tmp11 - tmp1, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[2] = range_limit[(int)RIGHT_SHIFT(tmp12 + tmp2, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[4] = range_limit[(int)RIGHT_SHIFT(tmp12 - tmp2, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[3] = range_limit[(int)RIGHT_SHIFT(tmp13, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; wsptr += 7; /* advance pointer to next row */ } } /* * Perform dequantization and inverse DCT on one block of coefficients, * producing a reduced-size 6x6 output block. * * Optimized algorithm with 3 multiplications in the 1-D kernel. * cK represents sqrt(2) * cos(K*pi/12). */ GLOBAL(void) _jpeg_idct_6x6(j_decompress_ptr cinfo, jpeg_component_info *compptr, JCOEFPTR coef_block, _JSAMPARRAY output_buf, JDIMENSION output_col) { JLONG tmp0, tmp1, tmp2, tmp10, tmp11, tmp12; JLONG z1, z2, z3; JCOEFPTR inptr; ISLOW_MULT_TYPE *quantptr; int *wsptr; _JSAMPROW outptr; _JSAMPLE *range_limit = IDCT_range_limit(cinfo); int ctr; int workspace[6 * 6]; /* buffers data between passes */ SHIFT_TEMPS /* Pass 1: process columns from input, store into work array. */ inptr = coef_block; quantptr = (ISLOW_MULT_TYPE *)compptr->dct_table; wsptr = workspace; for (ctr = 0; ctr < 6; ctr++, inptr++, quantptr++, wsptr++) { /* Even part */ tmp0 = DEQUANTIZE(inptr[DCTSIZE * 0], quantptr[DCTSIZE * 0]); tmp0 = LEFT_SHIFT(tmp0, CONST_BITS); /* Add fudge factor here for final descale. */ tmp0 += ONE << (CONST_BITS - PASS1_BITS - 1); tmp2 = DEQUANTIZE(inptr[DCTSIZE * 4], quantptr[DCTSIZE * 4]); tmp10 = MULTIPLY(tmp2, FIX(0.707106781)); /* c4 */ tmp1 = tmp0 + tmp10; tmp11 = RIGHT_SHIFT(tmp0 - tmp10 - tmp10, CONST_BITS - PASS1_BITS); tmp10 = DEQUANTIZE(inptr[DCTSIZE * 2], quantptr[DCTSIZE * 2]); tmp0 = MULTIPLY(tmp10, FIX(1.224744871)); /* c2 */ tmp10 = tmp1 + tmp0; tmp12 = tmp1 - tmp0; /* Odd part */ z1 = DEQUANTIZE(inptr[DCTSIZE * 1], quantptr[DCTSIZE * 1]); z2 = DEQUANTIZE(inptr[DCTSIZE * 3], quantptr[DCTSIZE * 3]); z3 = DEQUANTIZE(inptr[DCTSIZE * 5], quantptr[DCTSIZE * 5]); tmp1 = MULTIPLY(z1 + z3, FIX(0.366025404)); /* c5 */ tmp0 = tmp1 + LEFT_SHIFT(z1 + z2, CONST_BITS); tmp2 = tmp1 + LEFT_SHIFT(z3 - z2, CONST_BITS); tmp1 = LEFT_SHIFT(z1 - z2 - z3, PASS1_BITS); /* Final output stage */ wsptr[6 * 0] = (int)RIGHT_SHIFT(tmp10 + tmp0, CONST_BITS - PASS1_BITS); wsptr[6 * 5] = (int)RIGHT_SHIFT(tmp10 - tmp0, CONST_BITS - PASS1_BITS); wsptr[6 * 1] = (int)(tmp11 + tmp1); wsptr[6 * 4] = (int)(tmp11 - tmp1); wsptr[6 * 2] = (int)RIGHT_SHIFT(tmp12 + tmp2, CONST_BITS - PASS1_BITS); wsptr[6 * 3] = (int)RIGHT_SHIFT(tmp12 - tmp2, CONST_BITS - PASS1_BITS); } /* Pass 2: process 6 rows from work array, store into output array. */ wsptr = workspace; for (ctr = 0; ctr < 6; ctr++) { outptr = output_buf[ctr] + output_col; /* Even part */ /* Add fudge factor here for final descale. */ tmp0 = (JLONG)wsptr[0] + (ONE << (PASS1_BITS + 2)); tmp0 = LEFT_SHIFT(tmp0, CONST_BITS); tmp2 = (JLONG)wsptr[4]; tmp10 = MULTIPLY(tmp2, FIX(0.707106781)); /* c4 */ tmp1 = tmp0 + tmp10; tmp11 = tmp0 - tmp10 - tmp10; tmp10 = (JLONG)wsptr[2]; tmp0 = MULTIPLY(tmp10, FIX(1.224744871)); /* c2 */ tmp10 = tmp1 + tmp0; tmp12 = tmp1 - tmp0; /* Odd part */ z1 = (JLONG)wsptr[1]; z2 = (JLONG)wsptr[3]; z3 = (JLONG)wsptr[5]; tmp1 = MULTIPLY(z1 + z3, FIX(0.366025404)); /* c5 */ tmp0 = tmp1 + LEFT_SHIFT(z1 + z2, CONST_BITS); tmp2 = tmp1 + LEFT_SHIFT(z3 - z2, CONST_BITS); tmp1 = LEFT_SHIFT(z1 - z2 - z3, CONST_BITS); /* Final output stage */ outptr[0] = range_limit[(int)RIGHT_SHIFT(tmp10 + tmp0, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[5] = range_limit[(int)RIGHT_SHIFT(tmp10 - tmp0, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[1] = range_limit[(int)RIGHT_SHIFT(tmp11 + tmp1, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[4] = range_limit[(int)RIGHT_SHIFT(tmp11 - tmp1, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[2] = range_limit[(int)RIGHT_SHIFT(tmp12 + tmp2, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[3] = range_limit[(int)RIGHT_SHIFT(tmp12 - tmp2, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; wsptr += 6; /* advance pointer to next row */ } } /* * Perform dequantization and inverse DCT on one block of coefficients, * producing a reduced-size 5x5 output block. * * Optimized algorithm with 5 multiplications in the 1-D kernel. * cK represents sqrt(2) * cos(K*pi/10). */ GLOBAL(void) _jpeg_idct_5x5(j_decompress_ptr cinfo, jpeg_component_info *compptr, JCOEFPTR coef_block, _JSAMPARRAY output_buf, JDIMENSION output_col) { JLONG tmp0, tmp1, tmp10, tmp11, tmp12; JLONG z1, z2, z3; JCOEFPTR inptr; ISLOW_MULT_TYPE *quantptr; int *wsptr; _JSAMPROW outptr; _JSAMPLE *range_limit = IDCT_range_limit(cinfo); int ctr; int workspace[5 * 5]; /* buffers data between passes */ SHIFT_TEMPS /* Pass 1: process columns from input, store into work array. */ inptr = coef_block; quantptr = (ISLOW_MULT_TYPE *)compptr->dct_table; wsptr = workspace; for (ctr = 0; ctr < 5; ctr++, inptr++, quantptr++, wsptr++) { /* Even part */ tmp12 = DEQUANTIZE(inptr[DCTSIZE * 0], quantptr[DCTSIZE * 0]); tmp12 = LEFT_SHIFT(tmp12, CONST_BITS); /* Add fudge factor here for final descale. */ tmp12 += ONE << (CONST_BITS - PASS1_BITS - 1); tmp0 = DEQUANTIZE(inptr[DCTSIZE * 2], quantptr[DCTSIZE * 2]); tmp1 = DEQUANTIZE(inptr[DCTSIZE * 4], quantptr[DCTSIZE * 4]); z1 = MULTIPLY(tmp0 + tmp1, FIX(0.790569415)); /* (c2+c4)/2 */ z2 = MULTIPLY(tmp0 - tmp1, FIX(0.353553391)); /* (c2-c4)/2 */ z3 = tmp12 + z2; tmp10 = z3 + z1; tmp11 = z3 - z1; tmp12 -= LEFT_SHIFT(z2, 2); /* Odd part */ z2 = DEQUANTIZE(inptr[DCTSIZE * 1], quantptr[DCTSIZE * 1]); z3 = DEQUANTIZE(inptr[DCTSIZE * 3], quantptr[DCTSIZE * 3]); z1 = MULTIPLY(z2 + z3, FIX(0.831253876)); /* c3 */ tmp0 = z1 + MULTIPLY(z2, FIX(0.513743148)); /* c1-c3 */ tmp1 = z1 - MULTIPLY(z3, FIX(2.176250899)); /* c1+c3 */ /* Final output stage */ wsptr[5 * 0] = (int)RIGHT_SHIFT(tmp10 + tmp0, CONST_BITS - PASS1_BITS); wsptr[5 * 4] = (int)RIGHT_SHIFT(tmp10 - tmp0, CONST_BITS - PASS1_BITS); wsptr[5 * 1] = (int)RIGHT_SHIFT(tmp11 + tmp1, CONST_BITS - PASS1_BITS); wsptr[5 * 3] = (int)RIGHT_SHIFT(tmp11 - tmp1, CONST_BITS - PASS1_BITS); wsptr[5 * 2] = (int)RIGHT_SHIFT(tmp12, CONST_BITS - PASS1_BITS); } /* Pass 2: process 5 rows from work array, store into output array. */ wsptr = workspace; for (ctr = 0; ctr < 5; ctr++) { outptr = output_buf[ctr] + output_col; /* Even part */ /* Add fudge factor here for final descale. */ tmp12 = (JLONG)wsptr[0] + (ONE << (PASS1_BITS + 2)); tmp12 = LEFT_SHIFT(tmp12, CONST_BITS); tmp0 = (JLONG)wsptr[2]; tmp1 = (JLONG)wsptr[4]; z1 = MULTIPLY(tmp0 + tmp1, FIX(0.790569415)); /* (c2+c4)/2 */ z2 = MULTIPLY(tmp0 - tmp1, FIX(0.353553391)); /* (c2-c4)/2 */ z3 = tmp12 + z2; tmp10 = z3 + z1; tmp11 = z3 - z1; tmp12 -= LEFT_SHIFT(z2, 2); /* Odd part */ z2 = (JLONG)wsptr[1]; z3 = (JLONG)wsptr[3]; z1 = MULTIPLY(z2 + z3, FIX(0.831253876)); /* c3 */ tmp0 = z1 + MULTIPLY(z2, FIX(0.513743148)); /* c1-c3 */ tmp1 = z1 - MULTIPLY(z3, FIX(2.176250899)); /* c1+c3 */ /* Final output stage */ outptr[0] = range_limit[(int)RIGHT_SHIFT(tmp10 + tmp0, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[4] = range_limit[(int)RIGHT_SHIFT(tmp10 - tmp0, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[1] = range_limit[(int)RIGHT_SHIFT(tmp11 + tmp1, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[3] = range_limit[(int)RIGHT_SHIFT(tmp11 - tmp1, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[2] = range_limit[(int)RIGHT_SHIFT(tmp12, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; wsptr += 5; /* advance pointer to next row */ } } /* * Perform dequantization and inverse DCT on one block of coefficients, * producing a reduced-size 3x3 output block. * * Optimized algorithm with 2 multiplications in the 1-D kernel. * cK represents sqrt(2) * cos(K*pi/6). */ GLOBAL(void) _jpeg_idct_3x3(j_decompress_ptr cinfo, jpeg_component_info *compptr, JCOEFPTR coef_block, _JSAMPARRAY output_buf, JDIMENSION output_col) { JLONG tmp0, tmp2, tmp10, tmp12; JCOEFPTR inptr; ISLOW_MULT_TYPE *quantptr; int *wsptr; _JSAMPROW outptr; _JSAMPLE *range_limit = IDCT_range_limit(cinfo); int ctr; int workspace[3 * 3]; /* buffers data between passes */ SHIFT_TEMPS /* Pass 1: process columns from input, store into work array. */ inptr = coef_block; quantptr = (ISLOW_MULT_TYPE *)compptr->dct_table; wsptr = workspace; for (ctr = 0; ctr < 3; ctr++, inptr++, quantptr++, wsptr++) { /* Even part */ tmp0 = DEQUANTIZE(inptr[DCTSIZE * 0], quantptr[DCTSIZE * 0]); tmp0 = LEFT_SHIFT(tmp0, CONST_BITS); /* Add fudge factor here for final descale. */ tmp0 += ONE << (CONST_BITS - PASS1_BITS - 1); tmp2 = DEQUANTIZE(inptr[DCTSIZE * 2], quantptr[DCTSIZE * 2]); tmp12 = MULTIPLY(tmp2, FIX(0.707106781)); /* c2 */ tmp10 = tmp0 + tmp12; tmp2 = tmp0 - tmp12 - tmp12; /* Odd part */ tmp12 = DEQUANTIZE(inptr[DCTSIZE * 1], quantptr[DCTSIZE * 1]); tmp0 = MULTIPLY(tmp12, FIX(1.224744871)); /* c1 */ /* Final output stage */ wsptr[3 * 0] = (int)RIGHT_SHIFT(tmp10 + tmp0, CONST_BITS - PASS1_BITS); wsptr[3 * 2] = (int)RIGHT_SHIFT(tmp10 - tmp0, CONST_BITS - PASS1_BITS); wsptr[3 * 1] = (int)RIGHT_SHIFT(tmp2, CONST_BITS - PASS1_BITS); } /* Pass 2: process 3 rows from work array, store into output array. */ wsptr = workspace; for (ctr = 0; ctr < 3; ctr++) { outptr = output_buf[ctr] + output_col; /* Even part */ /* Add fudge factor here for final descale. */ tmp0 = (JLONG)wsptr[0] + (ONE << (PASS1_BITS + 2)); tmp0 = LEFT_SHIFT(tmp0, CONST_BITS); tmp2 = (JLONG)wsptr[2]; tmp12 = MULTIPLY(tmp2, FIX(0.707106781)); /* c2 */ tmp10 = tmp0 + tmp12; tmp2 = tmp0 - tmp12 - tmp12; /* Odd part */ tmp12 = (JLONG)wsptr[1]; tmp0 = MULTIPLY(tmp12, FIX(1.224744871)); /* c1 */ /* Final output stage */ outptr[0] = range_limit[(int)RIGHT_SHIFT(tmp10 + tmp0, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[2] = range_limit[(int)RIGHT_SHIFT(tmp10 - tmp0, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[1] = range_limit[(int)RIGHT_SHIFT(tmp2, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; wsptr += 3; /* advance pointer to next row */ } } /* * Perform dequantization and inverse DCT on one block of coefficients, * producing a 9x9 output block. * * Optimized algorithm with 10 multiplications in the 1-D kernel. * cK represents sqrt(2) * cos(K*pi/18). */ GLOBAL(void) _jpeg_idct_9x9(j_decompress_ptr cinfo, jpeg_component_info *compptr, JCOEFPTR coef_block, _JSAMPARRAY output_buf, JDIMENSION output_col) { JLONG tmp0, tmp1, tmp2, tmp3, tmp10, tmp11, tmp12, tmp13, tmp14; JLONG z1, z2, z3, z4; JCOEFPTR inptr; ISLOW_MULT_TYPE *quantptr; int *wsptr; _JSAMPROW outptr; _JSAMPLE *range_limit = IDCT_range_limit(cinfo); int ctr; int workspace[8 * 9]; /* buffers data between passes */ SHIFT_TEMPS /* Pass 1: process columns from input, store into work array. */ inptr = coef_block; quantptr = (ISLOW_MULT_TYPE *)compptr->dct_table; wsptr = workspace; for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { /* Even part */ tmp0 = DEQUANTIZE(inptr[DCTSIZE * 0], quantptr[DCTSIZE * 0]); tmp0 = LEFT_SHIFT(tmp0, CONST_BITS); /* Add fudge factor here for final descale. */ tmp0 += ONE << (CONST_BITS - PASS1_BITS - 1); z1 = DEQUANTIZE(inptr[DCTSIZE * 2], quantptr[DCTSIZE * 2]); z2 = DEQUANTIZE(inptr[DCTSIZE * 4], quantptr[DCTSIZE * 4]); z3 = DEQUANTIZE(inptr[DCTSIZE * 6], quantptr[DCTSIZE * 6]); tmp3 = MULTIPLY(z3, FIX(0.707106781)); /* c6 */ tmp1 = tmp0 + tmp3; tmp2 = tmp0 - tmp3 - tmp3; tmp0 = MULTIPLY(z1 - z2, FIX(0.707106781)); /* c6 */ tmp11 = tmp2 + tmp0; tmp14 = tmp2 - tmp0 - tmp0; tmp0 = MULTIPLY(z1 + z2, FIX(1.328926049)); /* c2 */ tmp2 = MULTIPLY(z1, FIX(1.083350441)); /* c4 */ tmp3 = MULTIPLY(z2, FIX(0.245575608)); /* c8 */ tmp10 = tmp1 + tmp0 - tmp3; tmp12 = tmp1 - tmp0 + tmp2; tmp13 = tmp1 - tmp2 + tmp3; /* Odd part */ z1 = DEQUANTIZE(inptr[DCTSIZE * 1], quantptr[DCTSIZE * 1]); z2 = DEQUANTIZE(inptr[DCTSIZE * 3], quantptr[DCTSIZE * 3]); z3 = DEQUANTIZE(inptr[DCTSIZE * 5], quantptr[DCTSIZE * 5]); z4 = DEQUANTIZE(inptr[DCTSIZE * 7], quantptr[DCTSIZE * 7]); z2 = MULTIPLY(z2, -FIX(1.224744871)); /* -c3 */ tmp2 = MULTIPLY(z1 + z3, FIX(0.909038955)); /* c5 */ tmp3 = MULTIPLY(z1 + z4, FIX(0.483689525)); /* c7 */ tmp0 = tmp2 + tmp3 - z2; tmp1 = MULTIPLY(z3 - z4, FIX(1.392728481)); /* c1 */ tmp2 += z2 - tmp1; tmp3 += z2 + tmp1; tmp1 = MULTIPLY(z1 - z3 - z4, FIX(1.224744871)); /* c3 */ /* Final output stage */ wsptr[8 * 0] = (int)RIGHT_SHIFT(tmp10 + tmp0, CONST_BITS - PASS1_BITS); wsptr[8 * 8] = (int)RIGHT_SHIFT(tmp10 - tmp0, CONST_BITS - PASS1_BITS); wsptr[8 * 1] = (int)RIGHT_SHIFT(tmp11 + tmp1, CONST_BITS - PASS1_BITS); wsptr[8 * 7] = (int)RIGHT_SHIFT(tmp11 - tmp1, CONST_BITS - PASS1_BITS); wsptr[8 * 2] = (int)RIGHT_SHIFT(tmp12 + tmp2, CONST_BITS - PASS1_BITS); wsptr[8 * 6] = (int)RIGHT_SHIFT(tmp12 - tmp2, CONST_BITS - PASS1_BITS); wsptr[8 * 3] = (int)RIGHT_SHIFT(tmp13 + tmp3, CONST_BITS - PASS1_BITS); wsptr[8 * 5] = (int)RIGHT_SHIFT(tmp13 - tmp3, CONST_BITS - PASS1_BITS); wsptr[8 * 4] = (int)RIGHT_SHIFT(tmp14, CONST_BITS - PASS1_BITS); } /* Pass 2: process 9 rows from work array, store into output array. */ wsptr = workspace; for (ctr = 0; ctr < 9; ctr++) { outptr = output_buf[ctr] + output_col; /* Even part */ /* Add fudge factor here for final descale. */ tmp0 = (JLONG)wsptr[0] + (ONE << (PASS1_BITS + 2)); tmp0 = LEFT_SHIFT(tmp0, CONST_BITS); z1 = (JLONG)wsptr[2]; z2 = (JLONG)wsptr[4]; z3 = (JLONG)wsptr[6]; tmp3 = MULTIPLY(z3, FIX(0.707106781)); /* c6 */ tmp1 = tmp0 + tmp3; tmp2 = tmp0 - tmp3 - tmp3; tmp0 = MULTIPLY(z1 - z2, FIX(0.707106781)); /* c6 */ tmp11 = tmp2 + tmp0; tmp14 = tmp2 - tmp0 - tmp0; tmp0 = MULTIPLY(z1 + z2, FIX(1.328926049)); /* c2 */ tmp2 = MULTIPLY(z1, FIX(1.083350441)); /* c4 */ tmp3 = MULTIPLY(z2, FIX(0.245575608)); /* c8 */ tmp10 = tmp1 + tmp0 - tmp3; tmp12 = tmp1 - tmp0 + tmp2; tmp13 = tmp1 - tmp2 + tmp3; /* Odd part */ z1 = (JLONG)wsptr[1]; z2 = (JLONG)wsptr[3]; z3 = (JLONG)wsptr[5]; z4 = (JLONG)wsptr[7]; z2 = MULTIPLY(z2, -FIX(1.224744871)); /* -c3 */ tmp2 = MULTIPLY(z1 + z3, FIX(0.909038955)); /* c5 */ tmp3 = MULTIPLY(z1 + z4, FIX(0.483689525)); /* c7 */ tmp0 = tmp2 + tmp3 - z2; tmp1 = MULTIPLY(z3 - z4, FIX(1.392728481)); /* c1 */ tmp2 += z2 - tmp1; tmp3 += z2 + tmp1; tmp1 = MULTIPLY(z1 - z3 - z4, FIX(1.224744871)); /* c3 */ /* Final output stage */ outptr[0] = range_limit[(int)RIGHT_SHIFT(tmp10 + tmp0, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[8] = range_limit[(int)RIGHT_SHIFT(tmp10 - tmp0, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[1] = range_limit[(int)RIGHT_SHIFT(tmp11 + tmp1, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[7] = range_limit[(int)RIGHT_SHIFT(tmp11 - tmp1, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[2] = range_limit[(int)RIGHT_SHIFT(tmp12 + tmp2, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[6] = range_limit[(int)RIGHT_SHIFT(tmp12 - tmp2, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[3] = range_limit[(int)RIGHT_SHIFT(tmp13 + tmp3, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[5] = range_limit[(int)RIGHT_SHIFT(tmp13 - tmp3, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[4] = range_limit[(int)RIGHT_SHIFT(tmp14, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; wsptr += 8; /* advance pointer to next row */ } } /* * Perform dequantization and inverse DCT on one block of coefficients, * producing a 10x10 output block. * * Optimized algorithm with 12 multiplications in the 1-D kernel. * cK represents sqrt(2) * cos(K*pi/20). */ GLOBAL(void) _jpeg_idct_10x10(j_decompress_ptr cinfo, jpeg_component_info *compptr, JCOEFPTR coef_block, _JSAMPARRAY output_buf, JDIMENSION output_col) { JLONG tmp10, tmp11, tmp12, tmp13, tmp14; JLONG tmp20, tmp21, tmp22, tmp23, tmp24; JLONG z1, z2, z3, z4, z5; JCOEFPTR inptr; ISLOW_MULT_TYPE *quantptr; int *wsptr; _JSAMPROW outptr; _JSAMPLE *range_limit = IDCT_range_limit(cinfo); int ctr; int workspace[8 * 10]; /* buffers data between passes */ SHIFT_TEMPS /* Pass 1: process columns from input, store into work array. */ inptr = coef_block; quantptr = (ISLOW_MULT_TYPE *)compptr->dct_table; wsptr = workspace; for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { /* Even part */ z3 = DEQUANTIZE(inptr[DCTSIZE * 0], quantptr[DCTSIZE * 0]); z3 = LEFT_SHIFT(z3, CONST_BITS); /* Add fudge factor here for final descale. */ z3 += ONE << (CONST_BITS - PASS1_BITS - 1); z4 = DEQUANTIZE(inptr[DCTSIZE * 4], quantptr[DCTSIZE * 4]); z1 = MULTIPLY(z4, FIX(1.144122806)); /* c4 */ z2 = MULTIPLY(z4, FIX(0.437016024)); /* c8 */ tmp10 = z3 + z1; tmp11 = z3 - z2; tmp22 = RIGHT_SHIFT(z3 - LEFT_SHIFT(z1 - z2, 1), CONST_BITS - PASS1_BITS); /* c0 = (c4-c8)*2 */ z2 = DEQUANTIZE(inptr[DCTSIZE * 2], quantptr[DCTSIZE * 2]); z3 = DEQUANTIZE(inptr[DCTSIZE * 6], quantptr[DCTSIZE * 6]); z1 = MULTIPLY(z2 + z3, FIX(0.831253876)); /* c6 */ tmp12 = z1 + MULTIPLY(z2, FIX(0.513743148)); /* c2-c6 */ tmp13 = z1 - MULTIPLY(z3, FIX(2.176250899)); /* c2+c6 */ tmp20 = tmp10 + tmp12; tmp24 = tmp10 - tmp12; tmp21 = tmp11 + tmp13; tmp23 = tmp11 - tmp13; /* Odd part */ z1 = DEQUANTIZE(inptr[DCTSIZE * 1], quantptr[DCTSIZE * 1]); z2 = DEQUANTIZE(inptr[DCTSIZE * 3], quantptr[DCTSIZE * 3]); z3 = DEQUANTIZE(inptr[DCTSIZE * 5], quantptr[DCTSIZE * 5]); z4 = DEQUANTIZE(inptr[DCTSIZE * 7], quantptr[DCTSIZE * 7]); tmp11 = z2 + z4; tmp13 = z2 - z4; tmp12 = MULTIPLY(tmp13, FIX(0.309016994)); /* (c3-c7)/2 */ z5 = LEFT_SHIFT(z3, CONST_BITS); z2 = MULTIPLY(tmp11, FIX(0.951056516)); /* (c3+c7)/2 */ z4 = z5 + tmp12; tmp10 = MULTIPLY(z1, FIX(1.396802247)) + z2 + z4; /* c1 */ tmp14 = MULTIPLY(z1, FIX(0.221231742)) - z2 + z4; /* c9 */ z2 = MULTIPLY(tmp11, FIX(0.587785252)); /* (c1-c9)/2 */ z4 = z5 - tmp12 - LEFT_SHIFT(tmp13, CONST_BITS - 1); tmp12 = LEFT_SHIFT(z1 - tmp13 - z3, PASS1_BITS); tmp11 = MULTIPLY(z1, FIX(1.260073511)) - z2 - z4; /* c3 */ tmp13 = MULTIPLY(z1, FIX(0.642039522)) - z2 + z4; /* c7 */ /* Final output stage */ wsptr[8 * 0] = (int)RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS - PASS1_BITS); wsptr[8 * 9] = (int)RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS - PASS1_BITS); wsptr[8 * 1] = (int)RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS - PASS1_BITS); wsptr[8 * 8] = (int)RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS - PASS1_BITS); wsptr[8 * 2] = (int)(tmp22 + tmp12); wsptr[8 * 7] = (int)(tmp22 - tmp12); wsptr[8 * 3] = (int)RIGHT_SHIFT(tmp23 + tmp13, CONST_BITS - PASS1_BITS); wsptr[8 * 6] = (int)RIGHT_SHIFT(tmp23 - tmp13, CONST_BITS - PASS1_BITS); wsptr[8 * 4] = (int)RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS - PASS1_BITS); wsptr[8 * 5] = (int)RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS - PASS1_BITS); } /* Pass 2: process 10 rows from work array, store into output array. */ wsptr = workspace; for (ctr = 0; ctr < 10; ctr++) { outptr = output_buf[ctr] + output_col; /* Even part */ /* Add fudge factor here for final descale. */ z3 = (JLONG)wsptr[0] + (ONE << (PASS1_BITS + 2)); z3 = LEFT_SHIFT(z3, CONST_BITS); z4 = (JLONG)wsptr[4]; z1 = MULTIPLY(z4, FIX(1.144122806)); /* c4 */ z2 = MULTIPLY(z4, FIX(0.437016024)); /* c8 */ tmp10 = z3 + z1; tmp11 = z3 - z2; tmp22 = z3 - LEFT_SHIFT(z1 - z2, 1); /* c0 = (c4-c8)*2 */ z2 = (JLONG)wsptr[2]; z3 = (JLONG)wsptr[6]; z1 = MULTIPLY(z2 + z3, FIX(0.831253876)); /* c6 */ tmp12 = z1 + MULTIPLY(z2, FIX(0.513743148)); /* c2-c6 */ tmp13 = z1 - MULTIPLY(z3, FIX(2.176250899)); /* c2+c6 */ tmp20 = tmp10 + tmp12; tmp24 = tmp10 - tmp12; tmp21 = tmp11 + tmp13; tmp23 = tmp11 - tmp13; /* Odd part */ z1 = (JLONG)wsptr[1]; z2 = (JLONG)wsptr[3]; z3 = (JLONG)wsptr[5]; z3 = LEFT_SHIFT(z3, CONST_BITS); z4 = (JLONG)wsptr[7]; tmp11 = z2 + z4; tmp13 = z2 - z4; tmp12 = MULTIPLY(tmp13, FIX(0.309016994)); /* (c3-c7)/2 */ z2 = MULTIPLY(tmp11, FIX(0.951056516)); /* (c3+c7)/2 */ z4 = z3 + tmp12; tmp10 = MULTIPLY(z1, FIX(1.396802247)) + z2 + z4; /* c1 */ tmp14 = MULTIPLY(z1, FIX(0.221231742)) - z2 + z4; /* c9 */ z2 = MULTIPLY(tmp11, FIX(0.587785252)); /* (c1-c9)/2 */ z4 = z3 - tmp12 - LEFT_SHIFT(tmp13, CONST_BITS - 1); tmp12 = LEFT_SHIFT(z1 - tmp13, CONST_BITS) - z3; tmp11 = MULTIPLY(z1, FIX(1.260073511)) - z2 - z4; /* c3 */ tmp13 = MULTIPLY(z1, FIX(0.642039522)) - z2 + z4; /* c7 */ /* Final output stage */ outptr[0] = range_limit[(int)RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[9] = range_limit[(int)RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[1] = range_limit[(int)RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[8] = range_limit[(int)RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[2] = range_limit[(int)RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[7] = range_limit[(int)RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[3] = range_limit[(int)RIGHT_SHIFT(tmp23 + tmp13, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[6] = range_limit[(int)RIGHT_SHIFT(tmp23 - tmp13, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[4] = range_limit[(int)RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[5] = range_limit[(int)RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; wsptr += 8; /* advance pointer to next row */ } } /* * Perform dequantization and inverse DCT on one block of coefficients, * producing an 11x11 output block. * * Optimized algorithm with 24 multiplications in the 1-D kernel. * cK represents sqrt(2) * cos(K*pi/22). */ GLOBAL(void) _jpeg_idct_11x11(j_decompress_ptr cinfo, jpeg_component_info *compptr, JCOEFPTR coef_block, _JSAMPARRAY output_buf, JDIMENSION output_col) { JLONG tmp10, tmp11, tmp12, tmp13, tmp14; JLONG tmp20, tmp21, tmp22, tmp23, tmp24, tmp25; JLONG z1, z2, z3, z4; JCOEFPTR inptr; ISLOW_MULT_TYPE *quantptr; int *wsptr; _JSAMPROW outptr; _JSAMPLE *range_limit = IDCT_range_limit(cinfo); int ctr; int workspace[8 * 11]; /* buffers data between passes */ SHIFT_TEMPS /* Pass 1: process columns from input, store into work array. */ inptr = coef_block; quantptr = (ISLOW_MULT_TYPE *)compptr->dct_table; wsptr = workspace; for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { /* Even part */ tmp10 = DEQUANTIZE(inptr[DCTSIZE * 0], quantptr[DCTSIZE * 0]); tmp10 = LEFT_SHIFT(tmp10, CONST_BITS); /* Add fudge factor here for final descale. */ tmp10 += ONE << (CONST_BITS - PASS1_BITS - 1); z1 = DEQUANTIZE(inptr[DCTSIZE * 2], quantptr[DCTSIZE * 2]); z2 = DEQUANTIZE(inptr[DCTSIZE * 4], quantptr[DCTSIZE * 4]); z3 = DEQUANTIZE(inptr[DCTSIZE * 6], quantptr[DCTSIZE * 6]); tmp20 = MULTIPLY(z2 - z3, FIX(2.546640132)); /* c2+c4 */ tmp23 = MULTIPLY(z2 - z1, FIX(0.430815045)); /* c2-c6 */ z4 = z1 + z3; tmp24 = MULTIPLY(z4, -FIX(1.155664402)); /* -(c2-c10) */ z4 -= z2; tmp25 = tmp10 + MULTIPLY(z4, FIX(1.356927976)); /* c2 */ tmp21 = tmp20 + tmp23 + tmp25 - MULTIPLY(z2, FIX(1.821790775)); /* c2+c4+c10-c6 */ tmp20 += tmp25 + MULTIPLY(z3, FIX(2.115825087)); /* c4+c6 */ tmp23 += tmp25 - MULTIPLY(z1, FIX(1.513598477)); /* c6+c8 */ tmp24 += tmp25; tmp22 = tmp24 - MULTIPLY(z3, FIX(0.788749120)); /* c8+c10 */ tmp24 += MULTIPLY(z2, FIX(1.944413522)) - /* c2+c8 */ MULTIPLY(z1, FIX(1.390975730)); /* c4+c10 */ tmp25 = tmp10 - MULTIPLY(z4, FIX(1.414213562)); /* c0 */ /* Odd part */ z1 = DEQUANTIZE(inptr[DCTSIZE * 1], quantptr[DCTSIZE * 1]); z2 = DEQUANTIZE(inptr[DCTSIZE * 3], quantptr[DCTSIZE * 3]); z3 = DEQUANTIZE(inptr[DCTSIZE * 5], quantptr[DCTSIZE * 5]); z4 = DEQUANTIZE(inptr[DCTSIZE * 7], quantptr[DCTSIZE * 7]); tmp11 = z1 + z2; tmp14 = MULTIPLY(tmp11 + z3 + z4, FIX(0.398430003)); /* c9 */ tmp11 = MULTIPLY(tmp11, FIX(0.887983902)); /* c3-c9 */ tmp12 = MULTIPLY(z1 + z3, FIX(0.670361295)); /* c5-c9 */ tmp13 = tmp14 + MULTIPLY(z1 + z4, FIX(0.366151574)); /* c7-c9 */ tmp10 = tmp11 + tmp12 + tmp13 - MULTIPLY(z1, FIX(0.923107866)); /* c7+c5+c3-c1-2*c9 */ z1 = tmp14 - MULTIPLY(z2 + z3, FIX(1.163011579)); /* c7+c9 */ tmp11 += z1 + MULTIPLY(z2, FIX(2.073276588)); /* c1+c7+3*c9-c3 */ tmp12 += z1 - MULTIPLY(z3, FIX(1.192193623)); /* c3+c5-c7-c9 */ z1 = MULTIPLY(z2 + z4, -FIX(1.798248910)); /* -(c1+c9) */ tmp11 += z1; tmp13 += z1 + MULTIPLY(z4, FIX(2.102458632)); /* c1+c5+c9-c7 */ tmp14 += MULTIPLY(z2, -FIX(1.467221301)) + /* -(c5+c9) */ MULTIPLY(z3, FIX(1.001388905)) - /* c1-c9 */ MULTIPLY(z4, FIX(1.684843907)); /* c3+c9 */ /* Final output stage */ wsptr[8 * 0] = (int)RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS - PASS1_BITS); wsptr[8 * 10] = (int)RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS - PASS1_BITS); wsptr[8 * 1] = (int)RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS - PASS1_BITS); wsptr[8 * 9] = (int)RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS - PASS1_BITS); wsptr[8 * 2] = (int)RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS - PASS1_BITS); wsptr[8 * 8] = (int)RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS - PASS1_BITS); wsptr[8 * 3] = (int)RIGHT_SHIFT(tmp23 + tmp13, CONST_BITS - PASS1_BITS); wsptr[8 * 7] = (int)RIGHT_SHIFT(tmp23 - tmp13, CONST_BITS - PASS1_BITS); wsptr[8 * 4] = (int)RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS - PASS1_BITS); wsptr[8 * 6] = (int)RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS - PASS1_BITS); wsptr[8 * 5] = (int)RIGHT_SHIFT(tmp25, CONST_BITS - PASS1_BITS); } /* Pass 2: process 11 rows from work array, store into output array. */ wsptr = workspace; for (ctr = 0; ctr < 11; ctr++) { outptr = output_buf[ctr] + output_col; /* Even part */ /* Add fudge factor here for final descale. */ tmp10 = (JLONG)wsptr[0] + (ONE << (PASS1_BITS + 2)); tmp10 = LEFT_SHIFT(tmp10, CONST_BITS); z1 = (JLONG)wsptr[2]; z2 = (JLONG)wsptr[4]; z3 = (JLONG)wsptr[6]; tmp20 = MULTIPLY(z2 - z3, FIX(2.546640132)); /* c2+c4 */ tmp23 = MULTIPLY(z2 - z1, FIX(0.430815045)); /* c2-c6 */ z4 = z1 + z3; tmp24 = MULTIPLY(z4, -FIX(1.155664402)); /* -(c2-c10) */ z4 -= z2; tmp25 = tmp10 + MULTIPLY(z4, FIX(1.356927976)); /* c2 */ tmp21 = tmp20 + tmp23 + tmp25 - MULTIPLY(z2, FIX(1.821790775)); /* c2+c4+c10-c6 */ tmp20 += tmp25 + MULTIPLY(z3, FIX(2.115825087)); /* c4+c6 */ tmp23 += tmp25 - MULTIPLY(z1, FIX(1.513598477)); /* c6+c8 */ tmp24 += tmp25; tmp22 = tmp24 - MULTIPLY(z3, FIX(0.788749120)); /* c8+c10 */ tmp24 += MULTIPLY(z2, FIX(1.944413522)) - /* c2+c8 */ MULTIPLY(z1, FIX(1.390975730)); /* c4+c10 */ tmp25 = tmp10 - MULTIPLY(z4, FIX(1.414213562)); /* c0 */ /* Odd part */ z1 = (JLONG)wsptr[1]; z2 = (JLONG)wsptr[3]; z3 = (JLONG)wsptr[5]; z4 = (JLONG)wsptr[7]; tmp11 = z1 + z2; tmp14 = MULTIPLY(tmp11 + z3 + z4, FIX(0.398430003)); /* c9 */ tmp11 = MULTIPLY(tmp11, FIX(0.887983902)); /* c3-c9 */ tmp12 = MULTIPLY(z1 + z3, FIX(0.670361295)); /* c5-c9 */ tmp13 = tmp14 + MULTIPLY(z1 + z4, FIX(0.366151574)); /* c7-c9 */ tmp10 = tmp11 + tmp12 + tmp13 - MULTIPLY(z1, FIX(0.923107866)); /* c7+c5+c3-c1-2*c9 */ z1 = tmp14 - MULTIPLY(z2 + z3, FIX(1.163011579)); /* c7+c9 */ tmp11 += z1 + MULTIPLY(z2, FIX(2.073276588)); /* c1+c7+3*c9-c3 */ tmp12 += z1 - MULTIPLY(z3, FIX(1.192193623)); /* c3+c5-c7-c9 */ z1 = MULTIPLY(z2 + z4, -FIX(1.798248910)); /* -(c1+c9) */ tmp11 += z1; tmp13 += z1 + MULTIPLY(z4, FIX(2.102458632)); /* c1+c5+c9-c7 */ tmp14 += MULTIPLY(z2, -FIX(1.467221301)) + /* -(c5+c9) */ MULTIPLY(z3, FIX(1.001388905)) - /* c1-c9 */ MULTIPLY(z4, FIX(1.684843907)); /* c3+c9 */ /* Final output stage */ outptr[0] = range_limit[(int)RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[10] = range_limit[(int)RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[1] = range_limit[(int)RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[9] = range_limit[(int)RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[2] = range_limit[(int)RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[8] = range_limit[(int)RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[3] = range_limit[(int)RIGHT_SHIFT(tmp23 + tmp13, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[7] = range_limit[(int)RIGHT_SHIFT(tmp23 - tmp13, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[4] = range_limit[(int)RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[6] = range_limit[(int)RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[5] = range_limit[(int)RIGHT_SHIFT(tmp25, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; wsptr += 8; /* advance pointer to next row */ } } /* * Perform dequantization and inverse DCT on one block of coefficients, * producing a 12x12 output block. * * Optimized algorithm with 15 multiplications in the 1-D kernel. * cK represents sqrt(2) * cos(K*pi/24). */ GLOBAL(void) _jpeg_idct_12x12(j_decompress_ptr cinfo, jpeg_component_info *compptr, JCOEFPTR coef_block, _JSAMPARRAY output_buf, JDIMENSION output_col) { JLONG tmp10, tmp11, tmp12, tmp13, tmp14, tmp15; JLONG tmp20, tmp21, tmp22, tmp23, tmp24, tmp25; JLONG z1, z2, z3, z4; JCOEFPTR inptr; ISLOW_MULT_TYPE *quantptr; int *wsptr; _JSAMPROW outptr; _JSAMPLE *range_limit = IDCT_range_limit(cinfo); int ctr; int workspace[8 * 12]; /* buffers data between passes */ SHIFT_TEMPS /* Pass 1: process columns from input, store into work array. */ inptr = coef_block; quantptr = (ISLOW_MULT_TYPE *)compptr->dct_table; wsptr = workspace; for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { /* Even part */ z3 = DEQUANTIZE(inptr[DCTSIZE * 0], quantptr[DCTSIZE * 0]); z3 = LEFT_SHIFT(z3, CONST_BITS); /* Add fudge factor here for final descale. */ z3 += ONE << (CONST_BITS - PASS1_BITS - 1); z4 = DEQUANTIZE(inptr[DCTSIZE * 4], quantptr[DCTSIZE * 4]); z4 = MULTIPLY(z4, FIX(1.224744871)); /* c4 */ tmp10 = z3 + z4; tmp11 = z3 - z4; z1 = DEQUANTIZE(inptr[DCTSIZE * 2], quantptr[DCTSIZE * 2]); z4 = MULTIPLY(z1, FIX(1.366025404)); /* c2 */ z1 = LEFT_SHIFT(z1, CONST_BITS); z2 = DEQUANTIZE(inptr[DCTSIZE * 6], quantptr[DCTSIZE * 6]); z2 = LEFT_SHIFT(z2, CONST_BITS); tmp12 = z1 - z2; tmp21 = z3 + tmp12; tmp24 = z3 - tmp12; tmp12 = z4 + z2; tmp20 = tmp10 + tmp12; tmp25 = tmp10 - tmp12; tmp12 = z4 - z1 - z2; tmp22 = tmp11 + tmp12; tmp23 = tmp11 - tmp12; /* Odd part */ z1 = DEQUANTIZE(inptr[DCTSIZE * 1], quantptr[DCTSIZE * 1]); z2 = DEQUANTIZE(inptr[DCTSIZE * 3], quantptr[DCTSIZE * 3]); z3 = DEQUANTIZE(inptr[DCTSIZE * 5], quantptr[DCTSIZE * 5]); z4 = DEQUANTIZE(inptr[DCTSIZE * 7], quantptr[DCTSIZE * 7]); tmp11 = MULTIPLY(z2, FIX(1.306562965)); /* c3 */ tmp14 = MULTIPLY(z2, -FIX_0_541196100); /* -c9 */ tmp10 = z1 + z3; tmp15 = MULTIPLY(tmp10 + z4, FIX(0.860918669)); /* c7 */ tmp12 = tmp15 + MULTIPLY(tmp10, FIX(0.261052384)); /* c5-c7 */ tmp10 = tmp12 + tmp11 + MULTIPLY(z1, FIX(0.280143716)); /* c1-c5 */ tmp13 = MULTIPLY(z3 + z4, -FIX(1.045510580)); /* -(c7+c11) */ tmp12 += tmp13 + tmp14 - MULTIPLY(z3, FIX(1.478575242)); /* c1+c5-c7-c11 */ tmp13 += tmp15 - tmp11 + MULTIPLY(z4, FIX(1.586706681)); /* c1+c11 */ tmp15 += tmp14 - MULTIPLY(z1, FIX(0.676326758)) - /* c7-c11 */ MULTIPLY(z4, FIX(1.982889723)); /* c5+c7 */ z1 -= z4; z2 -= z3; z3 = MULTIPLY(z1 + z2, FIX_0_541196100); /* c9 */ tmp11 = z3 + MULTIPLY(z1, FIX_0_765366865); /* c3-c9 */ tmp14 = z3 - MULTIPLY(z2, FIX_1_847759065); /* c3+c9 */ /* Final output stage */ wsptr[8 * 0] = (int)RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS - PASS1_BITS); wsptr[8 * 11] = (int)RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS - PASS1_BITS); wsptr[8 * 1] = (int)RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS - PASS1_BITS); wsptr[8 * 10] = (int)RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS - PASS1_BITS); wsptr[8 * 2] = (int)RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS - PASS1_BITS); wsptr[8 * 9] = (int)RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS - PASS1_BITS); wsptr[8 * 3] = (int)RIGHT_SHIFT(tmp23 + tmp13, CONST_BITS - PASS1_BITS); wsptr[8 * 8] = (int)RIGHT_SHIFT(tmp23 - tmp13, CONST_BITS - PASS1_BITS); wsptr[8 * 4] = (int)RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS - PASS1_BITS); wsptr[8 * 7] = (int)RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS - PASS1_BITS); wsptr[8 * 5] = (int)RIGHT_SHIFT(tmp25 + tmp15, CONST_BITS - PASS1_BITS); wsptr[8 * 6] = (int)RIGHT_SHIFT(tmp25 - tmp15, CONST_BITS - PASS1_BITS); } /* Pass 2: process 12 rows from work array, store into output array. */ wsptr = workspace; for (ctr = 0; ctr < 12; ctr++) { outptr = output_buf[ctr] + output_col; /* Even part */ /* Add fudge factor here for final descale. */ z3 = (JLONG)wsptr[0] + (ONE << (PASS1_BITS + 2)); z3 = LEFT_SHIFT(z3, CONST_BITS); z4 = (JLONG)wsptr[4]; z4 = MULTIPLY(z4, FIX(1.224744871)); /* c4 */ tmp10 = z3 + z4; tmp11 = z3 - z4; z1 = (JLONG)wsptr[2]; z4 = MULTIPLY(z1, FIX(1.366025404)); /* c2 */ z1 = LEFT_SHIFT(z1, CONST_BITS); z2 = (JLONG)wsptr[6]; z2 = LEFT_SHIFT(z2, CONST_BITS); tmp12 = z1 - z2; tmp21 = z3 + tmp12; tmp24 = z3 - tmp12; tmp12 = z4 + z2; tmp20 = tmp10 + tmp12; tmp25 = tmp10 - tmp12; tmp12 = z4 - z1 - z2; tmp22 = tmp11 + tmp12; tmp23 = tmp11 - tmp12; /* Odd part */ z1 = (JLONG)wsptr[1]; z2 = (JLONG)wsptr[3]; z3 = (JLONG)wsptr[5]; z4 = (JLONG)wsptr[7]; tmp11 = MULTIPLY(z2, FIX(1.306562965)); /* c3 */ tmp14 = MULTIPLY(z2, -FIX_0_541196100); /* -c9 */ tmp10 = z1 + z3; tmp15 = MULTIPLY(tmp10 + z4, FIX(0.860918669)); /* c7 */ tmp12 = tmp15 + MULTIPLY(tmp10, FIX(0.261052384)); /* c5-c7 */ tmp10 = tmp12 + tmp11 + MULTIPLY(z1, FIX(0.280143716)); /* c1-c5 */ tmp13 = MULTIPLY(z3 + z4, -FIX(1.045510580)); /* -(c7+c11) */ tmp12 += tmp13 + tmp14 - MULTIPLY(z3, FIX(1.478575242)); /* c1+c5-c7-c11 */ tmp13 += tmp15 - tmp11 + MULTIPLY(z4, FIX(1.586706681)); /* c1+c11 */ tmp15 += tmp14 - MULTIPLY(z1, FIX(0.676326758)) - /* c7-c11 */ MULTIPLY(z4, FIX(1.982889723)); /* c5+c7 */ z1 -= z4; z2 -= z3; z3 = MULTIPLY(z1 + z2, FIX_0_541196100); /* c9 */ tmp11 = z3 + MULTIPLY(z1, FIX_0_765366865); /* c3-c9 */ tmp14 = z3 - MULTIPLY(z2, FIX_1_847759065); /* c3+c9 */ /* Final output stage */ outptr[0] = range_limit[(int)RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[11] = range_limit[(int)RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[1] = range_limit[(int)RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[10] = range_limit[(int)RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[2] = range_limit[(int)RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[9] = range_limit[(int)RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[3] = range_limit[(int)RIGHT_SHIFT(tmp23 + tmp13, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[8] = range_limit[(int)RIGHT_SHIFT(tmp23 - tmp13, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[4] = range_limit[(int)RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[7] = range_limit[(int)RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[5] = range_limit[(int)RIGHT_SHIFT(tmp25 + tmp15, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[6] = range_limit[(int)RIGHT_SHIFT(tmp25 - tmp15, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; wsptr += 8; /* advance pointer to next row */ } } /* * Perform dequantization and inverse DCT on one block of coefficients, * producing a 13x13 output block. * * Optimized algorithm with 29 multiplications in the 1-D kernel. * cK represents sqrt(2) * cos(K*pi/26). */ GLOBAL(void) _jpeg_idct_13x13(j_decompress_ptr cinfo, jpeg_component_info *compptr, JCOEFPTR coef_block, _JSAMPARRAY output_buf, JDIMENSION output_col) { JLONG tmp10, tmp11, tmp12, tmp13, tmp14, tmp15; JLONG tmp20, tmp21, tmp22, tmp23, tmp24, tmp25, tmp26; JLONG z1, z2, z3, z4; JCOEFPTR inptr; ISLOW_MULT_TYPE *quantptr; int *wsptr; _JSAMPROW outptr; _JSAMPLE *range_limit = IDCT_range_limit(cinfo); int ctr; int workspace[8 * 13]; /* buffers data between passes */ SHIFT_TEMPS /* Pass 1: process columns from input, store into work array. */ inptr = coef_block; quantptr = (ISLOW_MULT_TYPE *)compptr->dct_table; wsptr = workspace; for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { /* Even part */ z1 = DEQUANTIZE(inptr[DCTSIZE * 0], quantptr[DCTSIZE * 0]); z1 = LEFT_SHIFT(z1, CONST_BITS); /* Add fudge factor here for final descale. */ z1 += ONE << (CONST_BITS - PASS1_BITS - 1); z2 = DEQUANTIZE(inptr[DCTSIZE * 2], quantptr[DCTSIZE * 2]); z3 = DEQUANTIZE(inptr[DCTSIZE * 4], quantptr[DCTSIZE * 4]); z4 = DEQUANTIZE(inptr[DCTSIZE * 6], quantptr[DCTSIZE * 6]); tmp10 = z3 + z4; tmp11 = z3 - z4; tmp12 = MULTIPLY(tmp10, FIX(1.155388986)); /* (c4+c6)/2 */ tmp13 = MULTIPLY(tmp11, FIX(0.096834934)) + z1; /* (c4-c6)/2 */ tmp20 = MULTIPLY(z2, FIX(1.373119086)) + tmp12 + tmp13; /* c2 */ tmp22 = MULTIPLY(z2, FIX(0.501487041)) - tmp12 + tmp13; /* c10 */ tmp12 = MULTIPLY(tmp10, FIX(0.316450131)); /* (c8-c12)/2 */ tmp13 = MULTIPLY(tmp11, FIX(0.486914739)) + z1; /* (c8+c12)/2 */ tmp21 = MULTIPLY(z2, FIX(1.058554052)) - tmp12 + tmp13; /* c6 */ tmp25 = MULTIPLY(z2, -FIX(1.252223920)) + tmp12 + tmp13; /* c4 */ tmp12 = MULTIPLY(tmp10, FIX(0.435816023)); /* (c2-c10)/2 */ tmp13 = MULTIPLY(tmp11, FIX(0.937303064)) - z1; /* (c2+c10)/2 */ tmp23 = MULTIPLY(z2, -FIX(0.170464608)) - tmp12 - tmp13; /* c12 */ tmp24 = MULTIPLY(z2, -FIX(0.803364869)) + tmp12 - tmp13; /* c8 */ tmp26 = MULTIPLY(tmp11 - z2, FIX(1.414213562)) + z1; /* c0 */ /* Odd part */ z1 = DEQUANTIZE(inptr[DCTSIZE * 1], quantptr[DCTSIZE * 1]); z2 = DEQUANTIZE(inptr[DCTSIZE * 3], quantptr[DCTSIZE * 3]); z3 = DEQUANTIZE(inptr[DCTSIZE * 5], quantptr[DCTSIZE * 5]); z4 = DEQUANTIZE(inptr[DCTSIZE * 7], quantptr[DCTSIZE * 7]); tmp11 = MULTIPLY(z1 + z2, FIX(1.322312651)); /* c3 */ tmp12 = MULTIPLY(z1 + z3, FIX(1.163874945)); /* c5 */ tmp15 = z1 + z4; tmp13 = MULTIPLY(tmp15, FIX(0.937797057)); /* c7 */ tmp10 = tmp11 + tmp12 + tmp13 - MULTIPLY(z1, FIX(2.020082300)); /* c7+c5+c3-c1 */ tmp14 = MULTIPLY(z2 + z3, -FIX(0.338443458)); /* -c11 */ tmp11 += tmp14 + MULTIPLY(z2, FIX(0.837223564)); /* c5+c9+c11-c3 */ tmp12 += tmp14 - MULTIPLY(z3, FIX(1.572116027)); /* c1+c5-c9-c11 */ tmp14 = MULTIPLY(z2 + z4, -FIX(1.163874945)); /* -c5 */ tmp11 += tmp14; tmp13 += tmp14 + MULTIPLY(z4, FIX(2.205608352)); /* c3+c5+c9-c7 */ tmp14 = MULTIPLY(z3 + z4, -FIX(0.657217813)); /* -c9 */ tmp12 += tmp14; tmp13 += tmp14; tmp15 = MULTIPLY(tmp15, FIX(0.338443458)); /* c11 */ tmp14 = tmp15 + MULTIPLY(z1, FIX(0.318774355)) - /* c9-c11 */ MULTIPLY(z2, FIX(0.466105296)); /* c1-c7 */ z1 = MULTIPLY(z3 - z2, FIX(0.937797057)); /* c7 */ tmp14 += z1; tmp15 += z1 + MULTIPLY(z3, FIX(0.384515595)) - /* c3-c7 */ MULTIPLY(z4, FIX(1.742345811)); /* c1+c11 */ /* Final output stage */ wsptr[8 * 0] = (int)RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS - PASS1_BITS); wsptr[8 * 12] = (int)RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS - PASS1_BITS); wsptr[8 * 1] = (int)RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS - PASS1_BITS); wsptr[8 * 11] = (int)RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS - PASS1_BITS); wsptr[8 * 2] = (int)RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS - PASS1_BITS); wsptr[8 * 10] = (int)RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS - PASS1_BITS); wsptr[8 * 3] = (int)RIGHT_SHIFT(tmp23 + tmp13, CONST_BITS - PASS1_BITS); wsptr[8 * 9] = (int)RIGHT_SHIFT(tmp23 - tmp13, CONST_BITS - PASS1_BITS); wsptr[8 * 4] = (int)RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS - PASS1_BITS); wsptr[8 * 8] = (int)RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS - PASS1_BITS); wsptr[8 * 5] = (int)RIGHT_SHIFT(tmp25 + tmp15, CONST_BITS - PASS1_BITS); wsptr[8 * 7] = (int)RIGHT_SHIFT(tmp25 - tmp15, CONST_BITS - PASS1_BITS); wsptr[8 * 6] = (int)RIGHT_SHIFT(tmp26, CONST_BITS - PASS1_BITS); } /* Pass 2: process 13 rows from work array, store into output array. */ wsptr = workspace; for (ctr = 0; ctr < 13; ctr++) { outptr = output_buf[ctr] + output_col; /* Even part */ /* Add fudge factor here for final descale. */ z1 = (JLONG)wsptr[0] + (ONE << (PASS1_BITS + 2)); z1 = LEFT_SHIFT(z1, CONST_BITS); z2 = (JLONG)wsptr[2]; z3 = (JLONG)wsptr[4]; z4 = (JLONG)wsptr[6]; tmp10 = z3 + z4; tmp11 = z3 - z4; tmp12 = MULTIPLY(tmp10, FIX(1.155388986)); /* (c4+c6)/2 */ tmp13 = MULTIPLY(tmp11, FIX(0.096834934)) + z1; /* (c4-c6)/2 */ tmp20 = MULTIPLY(z2, FIX(1.373119086)) + tmp12 + tmp13; /* c2 */ tmp22 = MULTIPLY(z2, FIX(0.501487041)) - tmp12 + tmp13; /* c10 */ tmp12 = MULTIPLY(tmp10, FIX(0.316450131)); /* (c8-c12)/2 */ tmp13 = MULTIPLY(tmp11, FIX(0.486914739)) + z1; /* (c8+c12)/2 */ tmp21 = MULTIPLY(z2, FIX(1.058554052)) - tmp12 + tmp13; /* c6 */ tmp25 = MULTIPLY(z2, -FIX(1.252223920)) + tmp12 + tmp13; /* c4 */ tmp12 = MULTIPLY(tmp10, FIX(0.435816023)); /* (c2-c10)/2 */ tmp13 = MULTIPLY(tmp11, FIX(0.937303064)) - z1; /* (c2+c10)/2 */ tmp23 = MULTIPLY(z2, -FIX(0.170464608)) - tmp12 - tmp13; /* c12 */ tmp24 = MULTIPLY(z2, -FIX(0.803364869)) + tmp12 - tmp13; /* c8 */ tmp26 = MULTIPLY(tmp11 - z2, FIX(1.414213562)) + z1; /* c0 */ /* Odd part */ z1 = (JLONG)wsptr[1]; z2 = (JLONG)wsptr[3]; z3 = (JLONG)wsptr[5]; z4 = (JLONG)wsptr[7]; tmp11 = MULTIPLY(z1 + z2, FIX(1.322312651)); /* c3 */ tmp12 = MULTIPLY(z1 + z3, FIX(1.163874945)); /* c5 */ tmp15 = z1 + z4; tmp13 = MULTIPLY(tmp15, FIX(0.937797057)); /* c7 */ tmp10 = tmp11 + tmp12 + tmp13 - MULTIPLY(z1, FIX(2.020082300)); /* c7+c5+c3-c1 */ tmp14 = MULTIPLY(z2 + z3, -FIX(0.338443458)); /* -c11 */ tmp11 += tmp14 + MULTIPLY(z2, FIX(0.837223564)); /* c5+c9+c11-c3 */ tmp12 += tmp14 - MULTIPLY(z3, FIX(1.572116027)); /* c1+c5-c9-c11 */ tmp14 = MULTIPLY(z2 + z4, -FIX(1.163874945)); /* -c5 */ tmp11 += tmp14; tmp13 += tmp14 + MULTIPLY(z4, FIX(2.205608352)); /* c3+c5+c9-c7 */ tmp14 = MULTIPLY(z3 + z4, -FIX(0.657217813)); /* -c9 */ tmp12 += tmp14; tmp13 += tmp14; tmp15 = MULTIPLY(tmp15, FIX(0.338443458)); /* c11 */ tmp14 = tmp15 + MULTIPLY(z1, FIX(0.318774355)) - /* c9-c11 */ MULTIPLY(z2, FIX(0.466105296)); /* c1-c7 */ z1 = MULTIPLY(z3 - z2, FIX(0.937797057)); /* c7 */ tmp14 += z1; tmp15 += z1 + MULTIPLY(z3, FIX(0.384515595)) - /* c3-c7 */ MULTIPLY(z4, FIX(1.742345811)); /* c1+c11 */ /* Final output stage */ outptr[0] = range_limit[(int)RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[12] = range_limit[(int)RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[1] = range_limit[(int)RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[11] = range_limit[(int)RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[2] = range_limit[(int)RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[10] = range_limit[(int)RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[3] = range_limit[(int)RIGHT_SHIFT(tmp23 + tmp13, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[9] = range_limit[(int)RIGHT_SHIFT(tmp23 - tmp13, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[4] = range_limit[(int)RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[8] = range_limit[(int)RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[5] = range_limit[(int)RIGHT_SHIFT(tmp25 + tmp15, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[7] = range_limit[(int)RIGHT_SHIFT(tmp25 - tmp15, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[6] = range_limit[(int)RIGHT_SHIFT(tmp26, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; wsptr += 8; /* advance pointer to next row */ } } /* * Perform dequantization and inverse DCT on one block of coefficients, * producing a 14x14 output block. * * Optimized algorithm with 20 multiplications in the 1-D kernel. * cK represents sqrt(2) * cos(K*pi/28). */ GLOBAL(void) _jpeg_idct_14x14(j_decompress_ptr cinfo, jpeg_component_info *compptr, JCOEFPTR coef_block, _JSAMPARRAY output_buf, JDIMENSION output_col) { JLONG tmp10, tmp11, tmp12, tmp13, tmp14, tmp15, tmp16; JLONG tmp20, tmp21, tmp22, tmp23, tmp24, tmp25, tmp26; JLONG z1, z2, z3, z4; JCOEFPTR inptr; ISLOW_MULT_TYPE *quantptr; int *wsptr; _JSAMPROW outptr; _JSAMPLE *range_limit = IDCT_range_limit(cinfo); int ctr; int workspace[8 * 14]; /* buffers data between passes */ SHIFT_TEMPS /* Pass 1: process columns from input, store into work array. */ inptr = coef_block; quantptr = (ISLOW_MULT_TYPE *)compptr->dct_table; wsptr = workspace; for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { /* Even part */ z1 = DEQUANTIZE(inptr[DCTSIZE * 0], quantptr[DCTSIZE * 0]); z1 = LEFT_SHIFT(z1, CONST_BITS); /* Add fudge factor here for final descale. */ z1 += ONE << (CONST_BITS - PASS1_BITS - 1); z4 = DEQUANTIZE(inptr[DCTSIZE * 4], quantptr[DCTSIZE * 4]); z2 = MULTIPLY(z4, FIX(1.274162392)); /* c4 */ z3 = MULTIPLY(z4, FIX(0.314692123)); /* c12 */ z4 = MULTIPLY(z4, FIX(0.881747734)); /* c8 */ tmp10 = z1 + z2; tmp11 = z1 + z3; tmp12 = z1 - z4; tmp23 = RIGHT_SHIFT(z1 - LEFT_SHIFT(z2 + z3 - z4, 1), CONST_BITS - PASS1_BITS); /* c0 = (c4+c12-c8)*2 */ z1 = DEQUANTIZE(inptr[DCTSIZE * 2], quantptr[DCTSIZE * 2]); z2 = DEQUANTIZE(inptr[DCTSIZE * 6], quantptr[DCTSIZE * 6]); z3 = MULTIPLY(z1 + z2, FIX(1.105676686)); /* c6 */ tmp13 = z3 + MULTIPLY(z1, FIX(0.273079590)); /* c2-c6 */ tmp14 = z3 - MULTIPLY(z2, FIX(1.719280954)); /* c6+c10 */ tmp15 = MULTIPLY(z1, FIX(0.613604268)) - /* c10 */ MULTIPLY(z2, FIX(1.378756276)); /* c2 */ tmp20 = tmp10 + tmp13; tmp26 = tmp10 - tmp13; tmp21 = tmp11 + tmp14; tmp25 = tmp11 - tmp14; tmp22 = tmp12 + tmp15; tmp24 = tmp12 - tmp15; /* Odd part */ z1 = DEQUANTIZE(inptr[DCTSIZE * 1], quantptr[DCTSIZE * 1]); z2 = DEQUANTIZE(inptr[DCTSIZE * 3], quantptr[DCTSIZE * 3]); z3 = DEQUANTIZE(inptr[DCTSIZE * 5], quantptr[DCTSIZE * 5]); z4 = DEQUANTIZE(inptr[DCTSIZE * 7], quantptr[DCTSIZE * 7]); tmp13 = LEFT_SHIFT(z4, CONST_BITS); tmp14 = z1 + z3; tmp11 = MULTIPLY(z1 + z2, FIX(1.334852607)); /* c3 */ tmp12 = MULTIPLY(tmp14, FIX(1.197448846)); /* c5 */ tmp10 = tmp11 + tmp12 + tmp13 - MULTIPLY(z1, FIX(1.126980169)); /* c3+c5-c1 */ tmp14 = MULTIPLY(tmp14, FIX(0.752406978)); /* c9 */ tmp16 = tmp14 - MULTIPLY(z1, FIX(1.061150426)); /* c9+c11-c13 */ z1 -= z2; tmp15 = MULTIPLY(z1, FIX(0.467085129)) - tmp13; /* c11 */ tmp16 += tmp15; z1 += z4; z4 = MULTIPLY(z2 + z3, -FIX(0.158341681)) - tmp13; /* -c13 */ tmp11 += z4 - MULTIPLY(z2, FIX(0.424103948)); /* c3-c9-c13 */ tmp12 += z4 - MULTIPLY(z3, FIX(2.373959773)); /* c3+c5-c13 */ z4 = MULTIPLY(z3 - z2, FIX(1.405321284)); /* c1 */ tmp14 += z4 + tmp13 - MULTIPLY(z3, FIX(1.6906431334)); /* c1+c9-c11 */ tmp15 += z4 + MULTIPLY(z2, FIX(0.674957567)); /* c1+c11-c5 */ tmp13 = LEFT_SHIFT(z1 - z3, PASS1_BITS); /* Final output stage */ wsptr[8 * 0] = (int)RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS - PASS1_BITS); wsptr[8 * 13] = (int)RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS - PASS1_BITS); wsptr[8 * 1] = (int)RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS - PASS1_BITS); wsptr[8 * 12] = (int)RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS - PASS1_BITS); wsptr[8 * 2] = (int)RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS - PASS1_BITS); wsptr[8 * 11] = (int)RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS - PASS1_BITS); wsptr[8 * 3] = (int)(tmp23 + tmp13); wsptr[8 * 10] = (int)(tmp23 - tmp13); wsptr[8 * 4] = (int)RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS - PASS1_BITS); wsptr[8 * 9] = (int)RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS - PASS1_BITS); wsptr[8 * 5] = (int)RIGHT_SHIFT(tmp25 + tmp15, CONST_BITS - PASS1_BITS); wsptr[8 * 8] = (int)RIGHT_SHIFT(tmp25 - tmp15, CONST_BITS - PASS1_BITS); wsptr[8 * 6] = (int)RIGHT_SHIFT(tmp26 + tmp16, CONST_BITS - PASS1_BITS); wsptr[8 * 7] = (int)RIGHT_SHIFT(tmp26 - tmp16, CONST_BITS - PASS1_BITS); } /* Pass 2: process 14 rows from work array, store into output array. */ wsptr = workspace; for (ctr = 0; ctr < 14; ctr++) { outptr = output_buf[ctr] + output_col; /* Even part */ /* Add fudge factor here for final descale. */ z1 = (JLONG)wsptr[0] + (ONE << (PASS1_BITS + 2)); z1 = LEFT_SHIFT(z1, CONST_BITS); z4 = (JLONG)wsptr[4]; z2 = MULTIPLY(z4, FIX(1.274162392)); /* c4 */ z3 = MULTIPLY(z4, FIX(0.314692123)); /* c12 */ z4 = MULTIPLY(z4, FIX(0.881747734)); /* c8 */ tmp10 = z1 + z2; tmp11 = z1 + z3; tmp12 = z1 - z4; tmp23 = z1 - LEFT_SHIFT(z2 + z3 - z4, 1); /* c0 = (c4+c12-c8)*2 */ z1 = (JLONG)wsptr[2]; z2 = (JLONG)wsptr[6]; z3 = MULTIPLY(z1 + z2, FIX(1.105676686)); /* c6 */ tmp13 = z3 + MULTIPLY(z1, FIX(0.273079590)); /* c2-c6 */ tmp14 = z3 - MULTIPLY(z2, FIX(1.719280954)); /* c6+c10 */ tmp15 = MULTIPLY(z1, FIX(0.613604268)) - /* c10 */ MULTIPLY(z2, FIX(1.378756276)); /* c2 */ tmp20 = tmp10 + tmp13; tmp26 = tmp10 - tmp13; tmp21 = tmp11 + tmp14; tmp25 = tmp11 - tmp14; tmp22 = tmp12 + tmp15; tmp24 = tmp12 - tmp15; /* Odd part */ z1 = (JLONG)wsptr[1]; z2 = (JLONG)wsptr[3]; z3 = (JLONG)wsptr[5]; z4 = (JLONG)wsptr[7]; z4 = LEFT_SHIFT(z4, CONST_BITS); tmp14 = z1 + z3; tmp11 = MULTIPLY(z1 + z2, FIX(1.334852607)); /* c3 */ tmp12 = MULTIPLY(tmp14, FIX(1.197448846)); /* c5 */ tmp10 = tmp11 + tmp12 + z4 - MULTIPLY(z1, FIX(1.126980169)); /* c3+c5-c1 */ tmp14 = MULTIPLY(tmp14, FIX(0.752406978)); /* c9 */ tmp16 = tmp14 - MULTIPLY(z1, FIX(1.061150426)); /* c9+c11-c13 */ z1 -= z2; tmp15 = MULTIPLY(z1, FIX(0.467085129)) - z4; /* c11 */ tmp16 += tmp15; tmp13 = MULTIPLY(z2 + z3, -FIX(0.158341681)) - z4; /* -c13 */ tmp11 += tmp13 - MULTIPLY(z2, FIX(0.424103948)); /* c3-c9-c13 */ tmp12 += tmp13 - MULTIPLY(z3, FIX(2.373959773)); /* c3+c5-c13 */ tmp13 = MULTIPLY(z3 - z2, FIX(1.405321284)); /* c1 */ tmp14 += tmp13 + z4 - MULTIPLY(z3, FIX(1.6906431334)); /* c1+c9-c11 */ tmp15 += tmp13 + MULTIPLY(z2, FIX(0.674957567)); /* c1+c11-c5 */ tmp13 = LEFT_SHIFT(z1 - z3, CONST_BITS) + z4; /* Final output stage */ outptr[0] = range_limit[(int)RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[13] = range_limit[(int)RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[1] = range_limit[(int)RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[12] = range_limit[(int)RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[2] = range_limit[(int)RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[11] = range_limit[(int)RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[3] = range_limit[(int)RIGHT_SHIFT(tmp23 + tmp13, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[10] = range_limit[(int)RIGHT_SHIFT(tmp23 - tmp13, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[4] = range_limit[(int)RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[9] = range_limit[(int)RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[5] = range_limit[(int)RIGHT_SHIFT(tmp25 + tmp15, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[8] = range_limit[(int)RIGHT_SHIFT(tmp25 - tmp15, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[6] = range_limit[(int)RIGHT_SHIFT(tmp26 + tmp16, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[7] = range_limit[(int)RIGHT_SHIFT(tmp26 - tmp16, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; wsptr += 8; /* advance pointer to next row */ } } /* * Perform dequantization and inverse DCT on one block of coefficients, * producing a 15x15 output block. * * Optimized algorithm with 22 multiplications in the 1-D kernel. * cK represents sqrt(2) * cos(K*pi/30). */ GLOBAL(void) _jpeg_idct_15x15(j_decompress_ptr cinfo, jpeg_component_info *compptr, JCOEFPTR coef_block, _JSAMPARRAY output_buf, JDIMENSION output_col) { JLONG tmp10, tmp11, tmp12, tmp13, tmp14, tmp15, tmp16; JLONG tmp20, tmp21, tmp22, tmp23, tmp24, tmp25, tmp26, tmp27; JLONG z1, z2, z3, z4; JCOEFPTR inptr; ISLOW_MULT_TYPE *quantptr; int *wsptr; _JSAMPROW outptr; _JSAMPLE *range_limit = IDCT_range_limit(cinfo); int ctr; int workspace[8 * 15]; /* buffers data between passes */ SHIFT_TEMPS /* Pass 1: process columns from input, store into work array. */ inptr = coef_block; quantptr = (ISLOW_MULT_TYPE *)compptr->dct_table; wsptr = workspace; for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { /* Even part */ z1 = DEQUANTIZE(inptr[DCTSIZE * 0], quantptr[DCTSIZE * 0]); z1 = LEFT_SHIFT(z1, CONST_BITS); /* Add fudge factor here for final descale. */ z1 += ONE << (CONST_BITS - PASS1_BITS - 1); z2 = DEQUANTIZE(inptr[DCTSIZE * 2], quantptr[DCTSIZE * 2]); z3 = DEQUANTIZE(inptr[DCTSIZE * 4], quantptr[DCTSIZE * 4]); z4 = DEQUANTIZE(inptr[DCTSIZE * 6], quantptr[DCTSIZE * 6]); tmp10 = MULTIPLY(z4, FIX(0.437016024)); /* c12 */ tmp11 = MULTIPLY(z4, FIX(1.144122806)); /* c6 */ tmp12 = z1 - tmp10; tmp13 = z1 + tmp11; z1 -= LEFT_SHIFT(tmp11 - tmp10, 1); /* c0 = (c6-c12)*2 */ z4 = z2 - z3; z3 += z2; tmp10 = MULTIPLY(z3, FIX(1.337628990)); /* (c2+c4)/2 */ tmp11 = MULTIPLY(z4, FIX(0.045680613)); /* (c2-c4)/2 */ z2 = MULTIPLY(z2, FIX(1.439773946)); /* c4+c14 */ tmp20 = tmp13 + tmp10 + tmp11; tmp23 = tmp12 - tmp10 + tmp11 + z2; tmp10 = MULTIPLY(z3, FIX(0.547059574)); /* (c8+c14)/2 */ tmp11 = MULTIPLY(z4, FIX(0.399234004)); /* (c8-c14)/2 */ tmp25 = tmp13 - tmp10 - tmp11; tmp26 = tmp12 + tmp10 - tmp11 - z2; tmp10 = MULTIPLY(z3, FIX(0.790569415)); /* (c6+c12)/2 */ tmp11 = MULTIPLY(z4, FIX(0.353553391)); /* (c6-c12)/2 */ tmp21 = tmp12 + tmp10 + tmp11; tmp24 = tmp13 - tmp10 + tmp11; tmp11 += tmp11; tmp22 = z1 + tmp11; /* c10 = c6-c12 */ tmp27 = z1 - tmp11 - tmp11; /* c0 = (c6-c12)*2 */ /* Odd part */ z1 = DEQUANTIZE(inptr[DCTSIZE * 1], quantptr[DCTSIZE * 1]); z2 = DEQUANTIZE(inptr[DCTSIZE * 3], quantptr[DCTSIZE * 3]); z4 = DEQUANTIZE(inptr[DCTSIZE * 5], quantptr[DCTSIZE * 5]); z3 = MULTIPLY(z4, FIX(1.224744871)); /* c5 */ z4 = DEQUANTIZE(inptr[DCTSIZE * 7], quantptr[DCTSIZE * 7]); tmp13 = z2 - z4; tmp15 = MULTIPLY(z1 + tmp13, FIX(0.831253876)); /* c9 */ tmp11 = tmp15 + MULTIPLY(z1, FIX(0.513743148)); /* c3-c9 */ tmp14 = tmp15 - MULTIPLY(tmp13, FIX(2.176250899)); /* c3+c9 */ tmp13 = MULTIPLY(z2, -FIX(0.831253876)); /* -c9 */ tmp15 = MULTIPLY(z2, -FIX(1.344997024)); /* -c3 */ z2 = z1 - z4; tmp12 = z3 + MULTIPLY(z2, FIX(1.406466353)); /* c1 */ tmp10 = tmp12 + MULTIPLY(z4, FIX(2.457431844)) - tmp15; /* c1+c7 */ tmp16 = tmp12 - MULTIPLY(z1, FIX(1.112434820)) + tmp13; /* c1-c13 */ tmp12 = MULTIPLY(z2, FIX(1.224744871)) - z3; /* c5 */ z2 = MULTIPLY(z1 + z4, FIX(0.575212477)); /* c11 */ tmp13 += z2 + MULTIPLY(z1, FIX(0.475753014)) - z3; /* c7-c11 */ tmp15 += z2 - MULTIPLY(z4, FIX(0.869244010)) + z3; /* c11+c13 */ /* Final output stage */ wsptr[8 * 0] = (int)RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS - PASS1_BITS); wsptr[8 * 14] = (int)RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS - PASS1_BITS); wsptr[8 * 1] = (int)RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS - PASS1_BITS); wsptr[8 * 13] = (int)RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS - PASS1_BITS); wsptr[8 * 2] = (int)RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS - PASS1_BITS); wsptr[8 * 12] = (int)RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS - PASS1_BITS); wsptr[8 * 3] = (int)RIGHT_SHIFT(tmp23 + tmp13, CONST_BITS - PASS1_BITS); wsptr[8 * 11] = (int)RIGHT_SHIFT(tmp23 - tmp13, CONST_BITS - PASS1_BITS); wsptr[8 * 4] = (int)RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS - PASS1_BITS); wsptr[8 * 10] = (int)RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS - PASS1_BITS); wsptr[8 * 5] = (int)RIGHT_SHIFT(tmp25 + tmp15, CONST_BITS - PASS1_BITS); wsptr[8 * 9] = (int)RIGHT_SHIFT(tmp25 - tmp15, CONST_BITS - PASS1_BITS); wsptr[8 * 6] = (int)RIGHT_SHIFT(tmp26 + tmp16, CONST_BITS - PASS1_BITS); wsptr[8 * 8] = (int)RIGHT_SHIFT(tmp26 - tmp16, CONST_BITS - PASS1_BITS); wsptr[8 * 7] = (int)RIGHT_SHIFT(tmp27, CONST_BITS - PASS1_BITS); } /* Pass 2: process 15 rows from work array, store into output array. */ wsptr = workspace; for (ctr = 0; ctr < 15; ctr++) { outptr = output_buf[ctr] + output_col; /* Even part */ /* Add fudge factor here for final descale. */ z1 = (JLONG)wsptr[0] + (ONE << (PASS1_BITS + 2)); z1 = LEFT_SHIFT(z1, CONST_BITS); z2 = (JLONG)wsptr[2]; z3 = (JLONG)wsptr[4]; z4 = (JLONG)wsptr[6]; tmp10 = MULTIPLY(z4, FIX(0.437016024)); /* c12 */ tmp11 = MULTIPLY(z4, FIX(1.144122806)); /* c6 */ tmp12 = z1 - tmp10; tmp13 = z1 + tmp11; z1 -= LEFT_SHIFT(tmp11 - tmp10, 1); /* c0 = (c6-c12)*2 */ z4 = z2 - z3; z3 += z2; tmp10 = MULTIPLY(z3, FIX(1.337628990)); /* (c2+c4)/2 */ tmp11 = MULTIPLY(z4, FIX(0.045680613)); /* (c2-c4)/2 */ z2 = MULTIPLY(z2, FIX(1.439773946)); /* c4+c14 */ tmp20 = tmp13 + tmp10 + tmp11; tmp23 = tmp12 - tmp10 + tmp11 + z2; tmp10 = MULTIPLY(z3, FIX(0.547059574)); /* (c8+c14)/2 */ tmp11 = MULTIPLY(z4, FIX(0.399234004)); /* (c8-c14)/2 */ tmp25 = tmp13 - tmp10 - tmp11; tmp26 = tmp12 + tmp10 - tmp11 - z2; tmp10 = MULTIPLY(z3, FIX(0.790569415)); /* (c6+c12)/2 */ tmp11 = MULTIPLY(z4, FIX(0.353553391)); /* (c6-c12)/2 */ tmp21 = tmp12 + tmp10 + tmp11; tmp24 = tmp13 - tmp10 + tmp11; tmp11 += tmp11; tmp22 = z1 + tmp11; /* c10 = c6-c12 */ tmp27 = z1 - tmp11 - tmp11; /* c0 = (c6-c12)*2 */ /* Odd part */ z1 = (JLONG)wsptr[1]; z2 = (JLONG)wsptr[3]; z4 = (JLONG)wsptr[5]; z3 = MULTIPLY(z4, FIX(1.224744871)); /* c5 */ z4 = (JLONG)wsptr[7]; tmp13 = z2 - z4; tmp15 = MULTIPLY(z1 + tmp13, FIX(0.831253876)); /* c9 */ tmp11 = tmp15 + MULTIPLY(z1, FIX(0.513743148)); /* c3-c9 */ tmp14 = tmp15 - MULTIPLY(tmp13, FIX(2.176250899)); /* c3+c9 */ tmp13 = MULTIPLY(z2, -FIX(0.831253876)); /* -c9 */ tmp15 = MULTIPLY(z2, -FIX(1.344997024)); /* -c3 */ z2 = z1 - z4; tmp12 = z3 + MULTIPLY(z2, FIX(1.406466353)); /* c1 */ tmp10 = tmp12 + MULTIPLY(z4, FIX(2.457431844)) - tmp15; /* c1+c7 */ tmp16 = tmp12 - MULTIPLY(z1, FIX(1.112434820)) + tmp13; /* c1-c13 */ tmp12 = MULTIPLY(z2, FIX(1.224744871)) - z3; /* c5 */ z2 = MULTIPLY(z1 + z4, FIX(0.575212477)); /* c11 */ tmp13 += z2 + MULTIPLY(z1, FIX(0.475753014)) - z3; /* c7-c11 */ tmp15 += z2 - MULTIPLY(z4, FIX(0.869244010)) + z3; /* c11+c13 */ /* Final output stage */ outptr[0] = range_limit[(int)RIGHT_SHIFT(tmp20 + tmp10, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[14] = range_limit[(int)RIGHT_SHIFT(tmp20 - tmp10, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[1] = range_limit[(int)RIGHT_SHIFT(tmp21 + tmp11, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[13] = range_limit[(int)RIGHT_SHIFT(tmp21 - tmp11, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[2] = range_limit[(int)RIGHT_SHIFT(tmp22 + tmp12, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[12] = range_limit[(int)RIGHT_SHIFT(tmp22 - tmp12, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[3] = range_limit[(int)RIGHT_SHIFT(tmp23 + tmp13, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[11] = range_limit[(int)RIGHT_SHIFT(tmp23 - tmp13, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[4] = range_limit[(int)RIGHT_SHIFT(tmp24 + tmp14, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[10] = range_limit[(int)RIGHT_SHIFT(tmp24 - tmp14, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[5] = range_limit[(int)RIGHT_SHIFT(tmp25 + tmp15, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[9] = range_limit[(int)RIGHT_SHIFT(tmp25 - tmp15, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[6] = range_limit[(int)RIGHT_SHIFT(tmp26 + tmp16, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[8] = range_limit[(int)RIGHT_SHIFT(tmp26 - tmp16, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[7] = range_limit[(int)RIGHT_SHIFT(tmp27, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; wsptr += 8; /* advance pointer to next row */ } } /* * Perform dequantization and inverse DCT on one block of coefficients, * producing a 16x16 output block. * * Optimized algorithm with 28 multiplications in the 1-D kernel. * cK represents sqrt(2) * cos(K*pi/32). */ GLOBAL(void) _jpeg_idct_16x16(j_decompress_ptr cinfo, jpeg_component_info *compptr, JCOEFPTR coef_block, _JSAMPARRAY output_buf, JDIMENSION output_col) { JLONG tmp0, tmp1, tmp2, tmp3, tmp10, tmp11, tmp12, tmp13; JLONG tmp20, tmp21, tmp22, tmp23, tmp24, tmp25, tmp26, tmp27; JLONG z1, z2, z3, z4; JCOEFPTR inptr; ISLOW_MULT_TYPE *quantptr; int *wsptr; _JSAMPROW outptr; _JSAMPLE *range_limit = IDCT_range_limit(cinfo); int ctr; int workspace[8 * 16]; /* buffers data between passes */ SHIFT_TEMPS /* Pass 1: process columns from input, store into work array. */ inptr = coef_block; quantptr = (ISLOW_MULT_TYPE *)compptr->dct_table; wsptr = workspace; for (ctr = 0; ctr < 8; ctr++, inptr++, quantptr++, wsptr++) { /* Even part */ tmp0 = DEQUANTIZE(inptr[DCTSIZE * 0], quantptr[DCTSIZE * 0]); tmp0 = LEFT_SHIFT(tmp0, CONST_BITS); /* Add fudge factor here for final descale. */ tmp0 += ONE << (CONST_BITS - PASS1_BITS - 1); z1 = DEQUANTIZE(inptr[DCTSIZE * 4], quantptr[DCTSIZE * 4]); tmp1 = MULTIPLY(z1, FIX(1.306562965)); /* c4[16] = c2[8] */ tmp2 = MULTIPLY(z1, FIX_0_541196100); /* c12[16] = c6[8] */ tmp10 = tmp0 + tmp1; tmp11 = tmp0 - tmp1; tmp12 = tmp0 + tmp2; tmp13 = tmp0 - tmp2; z1 = DEQUANTIZE(inptr[DCTSIZE * 2], quantptr[DCTSIZE * 2]); z2 = DEQUANTIZE(inptr[DCTSIZE * 6], quantptr[DCTSIZE * 6]); z3 = z1 - z2; z4 = MULTIPLY(z3, FIX(0.275899379)); /* c14[16] = c7[8] */ z3 = MULTIPLY(z3, FIX(1.387039845)); /* c2[16] = c1[8] */ tmp0 = z3 + MULTIPLY(z2, FIX_2_562915447); /* (c6+c2)[16] = (c3+c1)[8] */ tmp1 = z4 + MULTIPLY(z1, FIX_0_899976223); /* (c6-c14)[16] = (c3-c7)[8] */ tmp2 = z3 - MULTIPLY(z1, FIX(0.601344887)); /* (c2-c10)[16] = (c1-c5)[8] */ tmp3 = z4 - MULTIPLY(z2, FIX(0.509795579)); /* (c10-c14)[16] = (c5-c7)[8] */ tmp20 = tmp10 + tmp0; tmp27 = tmp10 - tmp0; tmp21 = tmp12 + tmp1; tmp26 = tmp12 - tmp1; tmp22 = tmp13 + tmp2; tmp25 = tmp13 - tmp2; tmp23 = tmp11 + tmp3; tmp24 = tmp11 - tmp3; /* Odd part */ z1 = DEQUANTIZE(inptr[DCTSIZE * 1], quantptr[DCTSIZE * 1]); z2 = DEQUANTIZE(inptr[DCTSIZE * 3], quantptr[DCTSIZE * 3]); z3 = DEQUANTIZE(inptr[DCTSIZE * 5], quantptr[DCTSIZE * 5]); z4 = DEQUANTIZE(inptr[DCTSIZE * 7], quantptr[DCTSIZE * 7]); tmp11 = z1 + z3; tmp1 = MULTIPLY(z1 + z2, FIX(1.353318001)); /* c3 */ tmp2 = MULTIPLY(tmp11, FIX(1.247225013)); /* c5 */ tmp3 = MULTIPLY(z1 + z4, FIX(1.093201867)); /* c7 */ tmp10 = MULTIPLY(z1 - z4, FIX(0.897167586)); /* c9 */ tmp11 = MULTIPLY(tmp11, FIX(0.666655658)); /* c11 */ tmp12 = MULTIPLY(z1 - z2, FIX(0.410524528)); /* c13 */ tmp0 = tmp1 + tmp2 + tmp3 - MULTIPLY(z1, FIX(2.286341144)); /* c7+c5+c3-c1 */ tmp13 = tmp10 + tmp11 + tmp12 - MULTIPLY(z1, FIX(1.835730603)); /* c9+c11+c13-c15 */ z1 = MULTIPLY(z2 + z3, FIX(0.138617169)); /* c15 */ tmp1 += z1 + MULTIPLY(z2, FIX(0.071888074)); /* c9+c11-c3-c15 */ tmp2 += z1 - MULTIPLY(z3, FIX(1.125726048)); /* c5+c7+c15-c3 */ z1 = MULTIPLY(z3 - z2, FIX(1.407403738)); /* c1 */ tmp11 += z1 - MULTIPLY(z3, FIX(0.766367282)); /* c1+c11-c9-c13 */ tmp12 += z1 + MULTIPLY(z2, FIX(1.971951411)); /* c1+c5+c13-c7 */ z2 += z4; z1 = MULTIPLY(z2, -FIX(0.666655658)); /* -c11 */ tmp1 += z1; tmp3 += z1 + MULTIPLY(z4, FIX(1.065388962)); /* c3+c11+c15-c7 */ z2 = MULTIPLY(z2, -FIX(1.247225013)); /* -c5 */ tmp10 += z2 + MULTIPLY(z4, FIX(3.141271809)); /* c1+c5+c9-c13 */ tmp12 += z2; z2 = MULTIPLY(z3 + z4, -FIX(1.353318001)); /* -c3 */ tmp2 += z2; tmp3 += z2; z2 = MULTIPLY(z4 - z3, FIX(0.410524528)); /* c13 */ tmp10 += z2; tmp11 += z2; /* Final output stage */ wsptr[8 * 0] = (int)RIGHT_SHIFT(tmp20 + tmp0, CONST_BITS - PASS1_BITS); wsptr[8 * 15] = (int)RIGHT_SHIFT(tmp20 - tmp0, CONST_BITS - PASS1_BITS); wsptr[8 * 1] = (int)RIGHT_SHIFT(tmp21 + tmp1, CONST_BITS - PASS1_BITS); wsptr[8 * 14] = (int)RIGHT_SHIFT(tmp21 - tmp1, CONST_BITS - PASS1_BITS); wsptr[8 * 2] = (int)RIGHT_SHIFT(tmp22 + tmp2, CONST_BITS - PASS1_BITS); wsptr[8 * 13] = (int)RIGHT_SHIFT(tmp22 - tmp2, CONST_BITS - PASS1_BITS); wsptr[8 * 3] = (int)RIGHT_SHIFT(tmp23 + tmp3, CONST_BITS - PASS1_BITS); wsptr[8 * 12] = (int)RIGHT_SHIFT(tmp23 - tmp3, CONST_BITS - PASS1_BITS); wsptr[8 * 4] = (int)RIGHT_SHIFT(tmp24 + tmp10, CONST_BITS - PASS1_BITS); wsptr[8 * 11] = (int)RIGHT_SHIFT(tmp24 - tmp10, CONST_BITS - PASS1_BITS); wsptr[8 * 5] = (int)RIGHT_SHIFT(tmp25 + tmp11, CONST_BITS - PASS1_BITS); wsptr[8 * 10] = (int)RIGHT_SHIFT(tmp25 - tmp11, CONST_BITS - PASS1_BITS); wsptr[8 * 6] = (int)RIGHT_SHIFT(tmp26 + tmp12, CONST_BITS - PASS1_BITS); wsptr[8 * 9] = (int)RIGHT_SHIFT(tmp26 - tmp12, CONST_BITS - PASS1_BITS); wsptr[8 * 7] = (int)RIGHT_SHIFT(tmp27 + tmp13, CONST_BITS - PASS1_BITS); wsptr[8 * 8] = (int)RIGHT_SHIFT(tmp27 - tmp13, CONST_BITS - PASS1_BITS); } /* Pass 2: process 16 rows from work array, store into output array. */ wsptr = workspace; for (ctr = 0; ctr < 16; ctr++) { outptr = output_buf[ctr] + output_col; /* Even part */ /* Add fudge factor here for final descale. */ tmp0 = (JLONG)wsptr[0] + (ONE << (PASS1_BITS + 2)); tmp0 = LEFT_SHIFT(tmp0, CONST_BITS); z1 = (JLONG)wsptr[4]; tmp1 = MULTIPLY(z1, FIX(1.306562965)); /* c4[16] = c2[8] */ tmp2 = MULTIPLY(z1, FIX_0_541196100); /* c12[16] = c6[8] */ tmp10 = tmp0 + tmp1; tmp11 = tmp0 - tmp1; tmp12 = tmp0 + tmp2; tmp13 = tmp0 - tmp2; z1 = (JLONG)wsptr[2]; z2 = (JLONG)wsptr[6]; z3 = z1 - z2; z4 = MULTIPLY(z3, FIX(0.275899379)); /* c14[16] = c7[8] */ z3 = MULTIPLY(z3, FIX(1.387039845)); /* c2[16] = c1[8] */ tmp0 = z3 + MULTIPLY(z2, FIX_2_562915447); /* (c6+c2)[16] = (c3+c1)[8] */ tmp1 = z4 + MULTIPLY(z1, FIX_0_899976223); /* (c6-c14)[16] = (c3-c7)[8] */ tmp2 = z3 - MULTIPLY(z1, FIX(0.601344887)); /* (c2-c10)[16] = (c1-c5)[8] */ tmp3 = z4 - MULTIPLY(z2, FIX(0.509795579)); /* (c10-c14)[16] = (c5-c7)[8] */ tmp20 = tmp10 + tmp0; tmp27 = tmp10 - tmp0; tmp21 = tmp12 + tmp1; tmp26 = tmp12 - tmp1; tmp22 = tmp13 + tmp2; tmp25 = tmp13 - tmp2; tmp23 = tmp11 + tmp3; tmp24 = tmp11 - tmp3; /* Odd part */ z1 = (JLONG)wsptr[1]; z2 = (JLONG)wsptr[3]; z3 = (JLONG)wsptr[5]; z4 = (JLONG)wsptr[7]; tmp11 = z1 + z3; tmp1 = MULTIPLY(z1 + z2, FIX(1.353318001)); /* c3 */ tmp2 = MULTIPLY(tmp11, FIX(1.247225013)); /* c5 */ tmp3 = MULTIPLY(z1 + z4, FIX(1.093201867)); /* c7 */ tmp10 = MULTIPLY(z1 - z4, FIX(0.897167586)); /* c9 */ tmp11 = MULTIPLY(tmp11, FIX(0.666655658)); /* c11 */ tmp12 = MULTIPLY(z1 - z2, FIX(0.410524528)); /* c13 */ tmp0 = tmp1 + tmp2 + tmp3 - MULTIPLY(z1, FIX(2.286341144)); /* c7+c5+c3-c1 */ tmp13 = tmp10 + tmp11 + tmp12 - MULTIPLY(z1, FIX(1.835730603)); /* c9+c11+c13-c15 */ z1 = MULTIPLY(z2 + z3, FIX(0.138617169)); /* c15 */ tmp1 += z1 + MULTIPLY(z2, FIX(0.071888074)); /* c9+c11-c3-c15 */ tmp2 += z1 - MULTIPLY(z3, FIX(1.125726048)); /* c5+c7+c15-c3 */ z1 = MULTIPLY(z3 - z2, FIX(1.407403738)); /* c1 */ tmp11 += z1 - MULTIPLY(z3, FIX(0.766367282)); /* c1+c11-c9-c13 */ tmp12 += z1 + MULTIPLY(z2, FIX(1.971951411)); /* c1+c5+c13-c7 */ z2 += z4; z1 = MULTIPLY(z2, -FIX(0.666655658)); /* -c11 */ tmp1 += z1; tmp3 += z1 + MULTIPLY(z4, FIX(1.065388962)); /* c3+c11+c15-c7 */ z2 = MULTIPLY(z2, -FIX(1.247225013)); /* -c5 */ tmp10 += z2 + MULTIPLY(z4, FIX(3.141271809)); /* c1+c5+c9-c13 */ tmp12 += z2; z2 = MULTIPLY(z3 + z4, -FIX(1.353318001)); /* -c3 */ tmp2 += z2; tmp3 += z2; z2 = MULTIPLY(z4 - z3, FIX(0.410524528)); /* c13 */ tmp10 += z2; tmp11 += z2; /* Final output stage */ outptr[0] = range_limit[(int)RIGHT_SHIFT(tmp20 + tmp0, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[15] = range_limit[(int)RIGHT_SHIFT(tmp20 - tmp0, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[1] = range_limit[(int)RIGHT_SHIFT(tmp21 + tmp1, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[14] = range_limit[(int)RIGHT_SHIFT(tmp21 - tmp1, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[2] = range_limit[(int)RIGHT_SHIFT(tmp22 + tmp2, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[13] = range_limit[(int)RIGHT_SHIFT(tmp22 - tmp2, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[3] = range_limit[(int)RIGHT_SHIFT(tmp23 + tmp3, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[12] = range_limit[(int)RIGHT_SHIFT(tmp23 - tmp3, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[4] = range_limit[(int)RIGHT_SHIFT(tmp24 + tmp10, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[11] = range_limit[(int)RIGHT_SHIFT(tmp24 - tmp10, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[5] = range_limit[(int)RIGHT_SHIFT(tmp25 + tmp11, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[10] = range_limit[(int)RIGHT_SHIFT(tmp25 - tmp11, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[6] = range_limit[(int)RIGHT_SHIFT(tmp26 + tmp12, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[9] = range_limit[(int)RIGHT_SHIFT(tmp26 - tmp12, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[7] = range_limit[(int)RIGHT_SHIFT(tmp27 + tmp13, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; outptr[8] = range_limit[(int)RIGHT_SHIFT(tmp27 - tmp13, CONST_BITS + PASS1_BITS + 3) & RANGE_MASK]; wsptr += 8; /* advance pointer to next row */ } } #endif /* IDCT_SCALING_SUPPORTED */ #endif /* DCT_ISLOW_SUPPORTED */