Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/libjpeg/transupp.h @ 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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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1 /*
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2 * transupp.h
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3 *
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4 * Copyright (C) 1997-2019, Thomas G. Lane, Guido Vollbeding.
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5 * This file is part of the Independent JPEG Group's software.
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6 * For conditions of distribution and use, see the accompanying README file.
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7 *
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8 * This file contains declarations for image transformation routines and
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9 * other utility code used by the jpegtran sample application. These are
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10 * NOT part of the core JPEG library. But we keep these routines separate
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11 * from jpegtran.c to ease the task of maintaining jpegtran-like programs
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12 * that have other user interfaces.
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13 *
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14 * NOTE: all the routines declared here have very specific requirements
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15 * about when they are to be executed during the reading and writing of the
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16 * source and destination files. See the comments in transupp.c, or see
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17 * jpegtran.c for an example of correct usage.
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18 */
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19
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20 /* If you happen not to want the image transform support, disable it here */
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21 #ifndef TRANSFORMS_SUPPORTED
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22 #define TRANSFORMS_SUPPORTED 1 /* 0 disables transform code */
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23 #endif
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24
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25 /*
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26 * Although rotating and flipping data expressed as DCT coefficients is not
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27 * hard, there is an asymmetry in the JPEG format specification for images
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28 * whose dimensions aren't multiples of the iMCU size. The right and bottom
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29 * image edges are padded out to the next iMCU boundary with junk data; but
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30 * no padding is possible at the top and left edges. If we were to flip
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31 * the whole image including the pad data, then pad garbage would become
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32 * visible at the top and/or left, and real pixels would disappear into the
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33 * pad margins --- perhaps permanently, since encoders & decoders may not
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34 * bother to preserve DCT blocks that appear to be completely outside the
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35 * nominal image area. So, we have to exclude any partial iMCUs from the
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36 * basic transformation.
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37 *
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38 * Transpose is the only transformation that can handle partial iMCUs at the
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39 * right and bottom edges completely cleanly. flip_h can flip partial iMCUs
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40 * at the bottom, but leaves any partial iMCUs at the right edge untouched.
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41 * Similarly flip_v leaves any partial iMCUs at the bottom edge untouched.
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42 * The other transforms are defined as combinations of these basic transforms
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43 * and process edge blocks in a way that preserves the equivalence.
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44 *
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45 * The "trim" option causes untransformable partial iMCUs to be dropped;
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46 * this is not strictly lossless, but it usually gives the best-looking
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47 * result for odd-size images. Note that when this option is active,
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48 * the expected mathematical equivalences between the transforms may not hold.
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49 * (For example, -rot 270 -trim trims only the bottom edge, but -rot 90 -trim
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50 * followed by -rot 180 -trim trims both edges.)
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51 *
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52 * We also offer a lossless-crop option, which discards data outside a given
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53 * image region but losslessly preserves what is inside. Like the rotate and
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54 * flip transforms, lossless crop is restricted by the current JPEG format: the
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55 * upper left corner of the selected region must fall on an iMCU boundary. If
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56 * this does not hold for the given crop parameters, we silently move the upper
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57 * left corner up and/or left to make it so, simultaneously increasing the
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58 * region dimensions to keep the lower right crop corner unchanged. (Thus, the
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59 * output image covers at least the requested region, but may cover more.)
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60 * The adjustment of the region dimensions may be optionally disabled.
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61 *
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62 * A complementary lossless-wipe option is provided to discard (gray out) data
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63 * inside a given image region while losslessly preserving what is outside.
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64 * Another option is lossless-drop, which replaces data at a given image
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65 * position by another image. Both source images must have the same
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66 * subsampling values. It is best if they also have the same quantization,
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67 * otherwise quantization adaption occurs. The trim option can be used with
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68 * the drop option to requantize the drop file to the source file.
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69 *
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70 * We also provide a lossless-resize option, which is kind of a lossless-crop
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71 * operation in the DCT coefficient block domain - it discards higher-order
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72 * coefficients and losslessly preserves lower-order coefficients of a
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73 * sub-block.
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74 *
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75 * Rotate/flip transform, resize, and crop can be requested together in a
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76 * single invocation. The crop is applied last --- that is, the crop region
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77 * is specified in terms of the destination image after transform/resize.
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78 *
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79 * We also offer a "force to grayscale" option, which simply discards the
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80 * chrominance channels of a YCbCr image. This is lossless in the sense that
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81 * the luminance channel is preserved exactly. It's not the same kind of
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82 * thing as the rotate/flip transformations, but it's convenient to handle it
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83 * as part of this package, mainly because the transformation routines have to
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84 * be aware of the option to know how many components to work on.
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85 */
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86
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87
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88 /* Short forms of external names for systems with brain-damaged linkers. */
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89
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90 #ifdef NEED_SHORT_EXTERNAL_NAMES
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91 #define jtransform_parse_crop_spec jTrParCrop
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92 #define jtransform_request_workspace jTrRequest
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93 #define jtransform_adjust_parameters jTrAdjust
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94 #define jtransform_execute_transform jTrExec
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95 #define jtransform_perfect_transform jTrPerfect
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96 #define jcopy_markers_setup jCMrkSetup
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97 #define jcopy_markers_execute jCMrkExec
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98 #endif /* NEED_SHORT_EXTERNAL_NAMES */
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99
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100
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101 /*
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102 * Codes for supported types of image transformations.
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103 */
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104
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105 typedef enum {
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106 JXFORM_NONE, /* no transformation */
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107 JXFORM_FLIP_H, /* horizontal flip */
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108 JXFORM_FLIP_V, /* vertical flip */
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109 JXFORM_TRANSPOSE, /* transpose across UL-to-LR axis */
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110 JXFORM_TRANSVERSE, /* transpose across UR-to-LL axis */
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111 JXFORM_ROT_90, /* 90-degree clockwise rotation */
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112 JXFORM_ROT_180, /* 180-degree rotation */
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113 JXFORM_ROT_270, /* 270-degree clockwise (or 90 ccw) */
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114 JXFORM_WIPE, /* wipe */
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115 JXFORM_DROP /* drop */
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116 } JXFORM_CODE;
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117
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118 /*
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119 * Codes for crop parameters, which can individually be unspecified,
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120 * positive or negative for xoffset or yoffset,
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121 * positive or force or reflect for width or height.
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122 */
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123
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124 typedef enum {
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125 JCROP_UNSET,
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126 JCROP_POS,
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127 JCROP_NEG,
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128 JCROP_FORCE,
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129 JCROP_REFLECT
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130 } JCROP_CODE;
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131
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132 /*
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133 * Transform parameters struct.
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134 * NB: application must not change any elements of this struct after
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135 * calling jtransform_request_workspace.
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136 */
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137
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138 typedef struct {
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139 /* Options: set by caller */
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140 JXFORM_CODE transform; /* image transform operator */
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141 boolean perfect; /* if TRUE, fail if partial MCUs are requested */
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142 boolean trim; /* if TRUE, trim partial MCUs as needed */
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143 boolean force_grayscale; /* if TRUE, convert color image to grayscale */
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144 boolean crop; /* if TRUE, crop or wipe source image, or drop */
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145
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146 /* Crop parameters: application need not set these unless crop is TRUE.
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147 * These can be filled in by jtransform_parse_crop_spec().
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148 */
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149 JDIMENSION crop_width; /* Width of selected region */
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150 JCROP_CODE crop_width_set; /* (force disables adjustment) */
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151 JDIMENSION crop_height; /* Height of selected region */
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152 JCROP_CODE crop_height_set; /* (force disables adjustment) */
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153 JDIMENSION crop_xoffset; /* X offset of selected region */
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154 JCROP_CODE crop_xoffset_set; /* (negative measures from right edge) */
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155 JDIMENSION crop_yoffset; /* Y offset of selected region */
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156 JCROP_CODE crop_yoffset_set; /* (negative measures from bottom edge) */
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157
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158 /* Drop parameters: set by caller for drop request */
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159 j_decompress_ptr drop_ptr;
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160 jvirt_barray_ptr * drop_coef_arrays;
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161
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162 /* Internal workspace: caller should not touch these */
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163 int num_components; /* # of components in workspace */
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164 jvirt_barray_ptr * workspace_coef_arrays; /* workspace for transformations */
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165 JDIMENSION output_width; /* cropped destination dimensions */
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166 JDIMENSION output_height;
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167 JDIMENSION x_crop_offset; /* destination crop offsets measured in iMCUs */
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168 JDIMENSION y_crop_offset;
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169 JDIMENSION drop_width; /* drop/wipe dimensions measured in iMCUs */
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170 JDIMENSION drop_height;
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171 int iMCU_sample_width; /* destination iMCU size */
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172 int iMCU_sample_height;
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173 } jpeg_transform_info;
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174
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175
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176 #if TRANSFORMS_SUPPORTED
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177
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178 /* Parse a crop specification (written in X11 geometry style) */
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179 EXTERN(boolean) jtransform_parse_crop_spec
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180 JPP((jpeg_transform_info *info, const char *spec));
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181 /* Request any required workspace */
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182 EXTERN(boolean) jtransform_request_workspace
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183 JPP((j_decompress_ptr srcinfo, jpeg_transform_info *info));
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184 /* Adjust output image parameters */
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185 EXTERN(jvirt_barray_ptr *) jtransform_adjust_parameters
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186 JPP((j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
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187 jvirt_barray_ptr *src_coef_arrays,
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188 jpeg_transform_info *info));
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189 /* Execute the actual transformation, if any */
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190 EXTERN(void) jtransform_execute_transform
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191 JPP((j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
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192 jvirt_barray_ptr *src_coef_arrays,
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193 jpeg_transform_info *info));
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194 /* Determine whether lossless transformation is perfectly
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195 * possible for a specified image and transformation.
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196 */
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197 EXTERN(boolean) jtransform_perfect_transform
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198 JPP((JDIMENSION image_width, JDIMENSION image_height,
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199 int MCU_width, int MCU_height,
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200 JXFORM_CODE transform));
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201
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202 /* jtransform_execute_transform used to be called
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203 * jtransform_execute_transformation, but some compilers complain about
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204 * routine names that long. This macro is here to avoid breaking any
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205 * old source code that uses the original name...
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206 */
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207 #define jtransform_execute_transformation jtransform_execute_transform
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208
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209 #endif /* TRANSFORMS_SUPPORTED */
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210
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211
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212 /*
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213 * Support for copying optional markers from source to destination file.
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214 */
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215
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216 typedef enum {
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217 JCOPYOPT_NONE, /* copy no optional markers */
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218 JCOPYOPT_COMMENTS, /* copy only comment (COM) markers */
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219 JCOPYOPT_ALL /* copy all optional markers */
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220 } JCOPY_OPTION;
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221
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222 #define JCOPYOPT_DEFAULT JCOPYOPT_COMMENTS /* recommended default */
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223
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224 /* Setup decompression object to save desired markers in memory */
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225 EXTERN(void) jcopy_markers_setup
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226 JPP((j_decompress_ptr srcinfo, JCOPY_OPTION option));
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227 /* Copy markers saved in the given source object to the destination object */
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228 EXTERN(void) jcopy_markers_execute
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229 JPP((j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
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230 JCOPY_OPTION option));