Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/libjpeg/jfdctfst.c @ 46:7ee69f120f19 default tip

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>>>>> tag v1.26.5+1 for changeset b74429b0f5c4
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:17:30 +0200
parents b50eed0cc0ef
children
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1 /*
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2 * jfdctfst.c
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3 *
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4 * Copyright (C) 1994-1996, Thomas G. Lane.
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5 * Modified 2003-2017 by Guido Vollbeding.
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6 * This file is part of the Independent JPEG Group's software.
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7 * For conditions of distribution and use, see the accompanying README file.
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8 *
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9 * This file contains a fast, not so accurate integer implementation of the
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10 * forward DCT (Discrete Cosine Transform).
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11 *
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12 * A 2-D DCT can be done by 1-D DCT on each row followed by 1-D DCT
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13 * on each column. Direct algorithms are also available, but they are
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14 * much more complex and seem not to be any faster when reduced to code.
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15 *
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16 * This implementation is based on Arai, Agui, and Nakajima's algorithm for
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17 * scaled DCT. Their original paper (Trans. IEICE E-71(11):1095) is in
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18 * Japanese, but the algorithm is described in the Pennebaker & Mitchell
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19 * JPEG textbook (see REFERENCES section in file README). The following code
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20 * is based directly on figure 4-8 in P&M.
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21 * While an 8-point DCT cannot be done in less than 11 multiplies, it is
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22 * possible to arrange the computation so that many of the multiplies are
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23 * simple scalings of the final outputs. These multiplies can then be
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24 * folded into the multiplications or divisions by the JPEG quantization
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25 * table entries. The AA&N method leaves only 5 multiplies and 29 adds
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26 * to be done in the DCT itself.
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27 * The primary disadvantage of this method is that with fixed-point math,
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28 * accuracy is lost due to imprecise representation of the scaled
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29 * quantization values. The smaller the quantization table entry, the less
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30 * precise the scaled value, so this implementation does worse with high-
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31 * quality-setting files than with low-quality ones.
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32 */
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33
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34 #define JPEG_INTERNALS
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35 #include "jinclude.h"
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36 #include "jpeglib.h"
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37 #include "jdct.h" /* Private declarations for DCT subsystem */
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38
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39 #ifdef DCT_IFAST_SUPPORTED
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41
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42 /*
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43 * This module is specialized to the case DCTSIZE = 8.
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44 */
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45
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46 #if DCTSIZE != 8
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47 Sorry, this code only copes with 8x8 DCT blocks. /* deliberate syntax err */
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48 #endif
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49
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50
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51 /* Scaling decisions are generally the same as in the LL&M algorithm;
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52 * see jfdctint.c for more details. However, we choose to descale
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53 * (right shift) multiplication products as soon as they are formed,
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54 * rather than carrying additional fractional bits into subsequent additions.
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55 * This compromises accuracy slightly, but it lets us save a few shifts.
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56 * More importantly, 16-bit arithmetic is then adequate (for 8-bit samples)
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57 * everywhere except in the multiplications proper; this saves a good deal
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58 * of work on 16-bit-int machines.
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59 *
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60 * Again to save a few shifts, the intermediate results between pass 1 and
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61 * pass 2 are not upscaled, but are represented only to integral precision.
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62 *
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63 * A final compromise is to represent the multiplicative constants to only
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64 * 8 fractional bits, rather than 13. This saves some shifting work on some
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65 * machines, and may also reduce the cost of multiplication (since there
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66 * are fewer one-bits in the constants).
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67 */
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68
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69 #define CONST_BITS 8
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71
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72 /* Some C compilers fail to reduce "FIX(constant)" at compile time, thus
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73 * causing a lot of useless floating-point operations at run time.
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74 * To get around this we use the following pre-calculated constants.
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75 * If you change CONST_BITS you may want to add appropriate values.
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76 * (With a reasonable C compiler, you can just rely on the FIX() macro...)
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77 */
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78
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79 #if CONST_BITS == 8
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80 #define FIX_0_382683433 ((INT32) 98) /* FIX(0.382683433) */
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81 #define FIX_0_541196100 ((INT32) 139) /* FIX(0.541196100) */
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82 #define FIX_0_707106781 ((INT32) 181) /* FIX(0.707106781) */
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83 #define FIX_1_306562965 ((INT32) 334) /* FIX(1.306562965) */
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84 #else
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85 #define FIX_0_382683433 FIX(0.382683433)
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86 #define FIX_0_541196100 FIX(0.541196100)
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87 #define FIX_0_707106781 FIX(0.707106781)
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88 #define FIX_1_306562965 FIX(1.306562965)
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89 #endif
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90
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91
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92 /* We can gain a little more speed, with a further compromise in accuracy,
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93 * by omitting the addition in a descaling shift. This yields an incorrectly
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94 * rounded result half the time...
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95 */
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97 #ifndef USE_ACCURATE_ROUNDING
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98 #undef DESCALE
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99 #define DESCALE(x,n) RIGHT_SHIFT(x, n)
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100 #endif
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101
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102
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103 /* Multiply a DCTELEM variable by an INT32 constant, and immediately
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104 * descale to yield a DCTELEM result.
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105 */
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106
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107 #define MULTIPLY(var,const) ((DCTELEM) DESCALE((var) * (const), CONST_BITS))
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108
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109
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110 /*
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111 * Perform the forward DCT on one block of samples.
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112 *
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113 * cK represents cos(K*pi/16).
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114 */
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115
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116 GLOBAL(void)
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117 jpeg_fdct_ifast (DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col)
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118 {
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119 DCTELEM tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
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120 DCTELEM tmp10, tmp11, tmp12, tmp13;
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121 DCTELEM z1, z2, z3, z4, z5, z11, z13;
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122 DCTELEM *dataptr;
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123 JSAMPROW elemptr;
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124 int ctr;
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125 SHIFT_TEMPS
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126
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127 /* Pass 1: process rows. */
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128
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129 dataptr = data;
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130 for (ctr = 0; ctr < DCTSIZE; ctr++) {
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131 elemptr = sample_data[ctr] + start_col;
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132
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133 /* Load data into workspace */
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134 tmp0 = GETJSAMPLE(elemptr[0]) + GETJSAMPLE(elemptr[7]);
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135 tmp7 = GETJSAMPLE(elemptr[0]) - GETJSAMPLE(elemptr[7]);
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136 tmp1 = GETJSAMPLE(elemptr[1]) + GETJSAMPLE(elemptr[6]);
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137 tmp6 = GETJSAMPLE(elemptr[1]) - GETJSAMPLE(elemptr[6]);
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138 tmp2 = GETJSAMPLE(elemptr[2]) + GETJSAMPLE(elemptr[5]);
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139 tmp5 = GETJSAMPLE(elemptr[2]) - GETJSAMPLE(elemptr[5]);
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140 tmp3 = GETJSAMPLE(elemptr[3]) + GETJSAMPLE(elemptr[4]);
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141 tmp4 = GETJSAMPLE(elemptr[3]) - GETJSAMPLE(elemptr[4]);
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142
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143 /* Even part */
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144
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145 tmp10 = tmp0 + tmp3; /* phase 2 */
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146 tmp13 = tmp0 - tmp3;
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147 tmp11 = tmp1 + tmp2;
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148 tmp12 = tmp1 - tmp2;
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149
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150 /* Apply unsigned->signed conversion. */
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151 dataptr[0] = tmp10 + tmp11 - 8 * CENTERJSAMPLE; /* phase 3 */
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152 dataptr[4] = tmp10 - tmp11;
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153
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154 z1 = MULTIPLY(tmp12 + tmp13, FIX_0_707106781); /* c4 */
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155 dataptr[2] = tmp13 + z1; /* phase 5 */
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156 dataptr[6] = tmp13 - z1;
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157
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158 /* Odd part */
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159
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160 tmp10 = tmp4 + tmp5; /* phase 2 */
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161 tmp11 = tmp5 + tmp6;
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162 tmp12 = tmp6 + tmp7;
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163
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164 /* The rotator is modified from fig 4-8 to avoid extra negations. */
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165 z5 = MULTIPLY(tmp10 - tmp12, FIX_0_382683433); /* c6 */
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166 z2 = MULTIPLY(tmp10, FIX_0_541196100) + z5; /* c2-c6 */
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diff changeset
167 z4 = MULTIPLY(tmp12, FIX_1_306562965) + z5; /* c2+c6 */
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168 z3 = MULTIPLY(tmp11, FIX_0_707106781); /* c4 */
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169
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diff changeset
170 z11 = tmp7 + z3; /* phase 5 */
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171 z13 = tmp7 - z3;
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172
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173 dataptr[5] = z13 + z2; /* phase 6 */
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174 dataptr[3] = z13 - z2;
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175 dataptr[1] = z11 + z4;
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176 dataptr[7] = z11 - z4;
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177
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diff changeset
178 dataptr += DCTSIZE; /* advance pointer to next row */
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179 }
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180
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diff changeset
181 /* Pass 2: process columns. */
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182
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diff changeset
183 dataptr = data;
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parents:
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184 for (ctr = DCTSIZE-1; ctr >= 0; ctr--) {
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diff changeset
185 tmp0 = dataptr[DCTSIZE*0] + dataptr[DCTSIZE*7];
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parents:
diff changeset
186 tmp7 = dataptr[DCTSIZE*0] - dataptr[DCTSIZE*7];
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parents:
diff changeset
187 tmp1 = dataptr[DCTSIZE*1] + dataptr[DCTSIZE*6];
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parents:
diff changeset
188 tmp6 = dataptr[DCTSIZE*1] - dataptr[DCTSIZE*6];
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
189 tmp2 = dataptr[DCTSIZE*2] + dataptr[DCTSIZE*5];
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
190 tmp5 = dataptr[DCTSIZE*2] - dataptr[DCTSIZE*5];
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
191 tmp3 = dataptr[DCTSIZE*3] + dataptr[DCTSIZE*4];
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
192 tmp4 = dataptr[DCTSIZE*3] - dataptr[DCTSIZE*4];
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parents:
diff changeset
193
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
194 /* Even part */
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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195
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196 tmp10 = tmp0 + tmp3; /* phase 2 */
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197 tmp13 = tmp0 - tmp3;
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198 tmp11 = tmp1 + tmp2;
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199 tmp12 = tmp1 - tmp2;
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200
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201 dataptr[DCTSIZE*0] = tmp10 + tmp11; /* phase 3 */
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202 dataptr[DCTSIZE*4] = tmp10 - tmp11;
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203
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204 z1 = MULTIPLY(tmp12 + tmp13, FIX_0_707106781); /* c4 */
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parents:
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205 dataptr[DCTSIZE*2] = tmp13 + z1; /* phase 5 */
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parents:
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206 dataptr[DCTSIZE*6] = tmp13 - z1;
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207
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208 /* Odd part */
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209
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parents:
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210 tmp10 = tmp4 + tmp5; /* phase 2 */
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parents:
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211 tmp11 = tmp5 + tmp6;
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parents:
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212 tmp12 = tmp6 + tmp7;
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parents:
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213
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parents:
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214 /* The rotator is modified from fig 4-8 to avoid extra negations. */
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parents:
diff changeset
215 z5 = MULTIPLY(tmp10 - tmp12, FIX_0_382683433); /* c6 */
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parents:
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216 z2 = MULTIPLY(tmp10, FIX_0_541196100) + z5; /* c2-c6 */
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parents:
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217 z4 = MULTIPLY(tmp12, FIX_1_306562965) + z5; /* c2+c6 */
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parents:
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218 z3 = MULTIPLY(tmp11, FIX_0_707106781); /* c4 */
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parents:
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219
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
220 z11 = tmp7 + z3; /* phase 5 */
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parents:
diff changeset
221 z13 = tmp7 - z3;
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parents:
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222
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
223 dataptr[DCTSIZE*5] = z13 + z2; /* phase 6 */
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parents:
diff changeset
224 dataptr[DCTSIZE*3] = z13 - z2;
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parents:
diff changeset
225 dataptr[DCTSIZE*1] = z11 + z4;
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parents:
diff changeset
226 dataptr[DCTSIZE*7] = z11 - z4;
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parents:
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227
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parents:
diff changeset
228 dataptr++; /* advance pointer to next column */
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parents:
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229 }
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parents:
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230 }
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parents:
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231
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parents:
diff changeset
232 #endif /* DCT_IFAST_SUPPORTED */