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annotate mupdf-source/thirdparty/libjpeg/jcprepct.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 * jcprepct.c
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3 *
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4 * Copyright (C) 1994-1996, Thomas G. Lane.
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5 * Modified 2003-2020 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 the compression preprocessing controller.
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10 * This controller manages the color conversion, downsampling,
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11 * and edge expansion steps.
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12 *
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13 * Most of the complexity here is associated with buffering input rows
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14 * as required by the downsampler. See the comments at the head of
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15 * jcsample.c for the downsampler's needs.
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16 */
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18 #define JPEG_INTERNALS
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19 #include "jinclude.h"
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20 #include "jpeglib.h"
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23 /* At present, jcsample.c can request context rows only for smoothing.
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24 * In the future, we might also need context rows for CCIR601 sampling
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25 * or other more-complex downsampling procedures. The code to support
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26 * context rows should be compiled only if needed.
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27 */
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28 #ifdef INPUT_SMOOTHING_SUPPORTED
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29 #define CONTEXT_ROWS_SUPPORTED
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30 #endif
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33 /*
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34 * For the simple (no-context-row) case, we just need to buffer one
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35 * row group's worth of pixels for the downsampling step. At the bottom of
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36 * the image, we pad to a full row group by replicating the last pixel row.
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37 * The downsampler's last output row is then replicated if needed to pad
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38 * out to a full iMCU row.
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39 *
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40 * When providing context rows, we must buffer three row groups' worth of
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41 * pixels. Three row groups are physically allocated, but the row pointer
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42 * arrays are made five row groups high, with the extra pointers above and
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43 * below "wrapping around" to point to the last and first real row groups.
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44 * This allows the downsampler to access the proper context rows.
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45 * At the top and bottom of the image, we create dummy context rows by
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46 * copying the first or last real pixel row. This copying could be avoided
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47 * by pointer hacking as is done in jdmainct.c, but it doesn't seem worth the
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48 * trouble on the compression side.
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49 */
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52 /* Private buffer controller object */
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54 typedef struct {
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55 struct jpeg_c_prep_controller pub; /* public fields */
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57 /* Downsampling input buffer. This buffer holds color-converted data
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58 * until we have enough to do a downsample step.
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59 */
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60 JSAMPARRAY color_buf[MAX_COMPONENTS];
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62 JDIMENSION rows_to_go; /* counts rows remaining in source image */
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63 int next_buf_row; /* index of next row to store in color_buf */
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65 #ifdef CONTEXT_ROWS_SUPPORTED /* only needed for context case */
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66 int this_row_group; /* starting row index of group to process */
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67 int next_buf_stop; /* downsample when we reach this index */
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68 #endif
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69 } my_prep_controller;
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71 typedef my_prep_controller * my_prep_ptr;
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74 /*
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75 * Initialize for a processing pass.
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76 */
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78 METHODDEF(void)
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79 start_pass_prep (j_compress_ptr cinfo, J_BUF_MODE pass_mode)
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80 {
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81 my_prep_ptr prep = (my_prep_ptr) cinfo->prep;
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83 if (pass_mode != JBUF_PASS_THRU)
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84 ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
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86 /* Initialize total-height counter for detecting bottom of image */
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87 prep->rows_to_go = cinfo->image_height;
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88 /* Mark the conversion buffer empty */
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89 prep->next_buf_row = 0;
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90 #ifdef CONTEXT_ROWS_SUPPORTED
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91 /* Preset additional state variables for context mode.
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92 * These aren't used in non-context mode, so we needn't test which mode.
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93 */
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94 prep->this_row_group = 0;
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95 /* Set next_buf_stop to stop after two row groups have been read in. */
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96 prep->next_buf_stop = 2 * cinfo->max_v_samp_factor;
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97 #endif
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98 }
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99
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parents:
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100
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parents:
diff changeset
101 /*
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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102 * Expand an image vertically from height input_rows to height output_rows,
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
103 * by duplicating the bottom row.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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104 */
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parents:
diff changeset
105
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parents:
diff changeset
106 LOCAL(void)
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parents:
diff changeset
107 expand_bottom_edge (JSAMPARRAY image_data, JDIMENSION num_cols,
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parents:
diff changeset
108 int input_rows, int output_rows)
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parents:
diff changeset
109 {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
110 register int row;
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parents:
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111
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parents:
diff changeset
112 for (row = input_rows; row < output_rows; row++) {
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parents:
diff changeset
113 jcopy_sample_rows(image_data + input_rows - 1,
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parents:
diff changeset
114 image_data + row,
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parents:
diff changeset
115 1, num_cols);
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116 }
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117 }
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118
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119
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120 /*
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121 * Process some data in the simple no-context case.
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:
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122 *
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Franz Glasner <fzglas.hg@dom66.de>
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123 * Preprocessor output data is counted in "row groups". A row group
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124 * is defined to be v_samp_factor sample rows of each component.
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125 * Downsampling will produce this much data from each max_v_samp_factor
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126 * input rows.
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127 */
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128
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129 METHODDEF(void)
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130 pre_process_data (j_compress_ptr cinfo,
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131 JSAMPARRAY input_buf, JDIMENSION *in_row_ctr,
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132 JDIMENSION in_rows_avail,
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133 JSAMPIMAGE output_buf, JDIMENSION *out_row_group_ctr,
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134 JDIMENSION out_row_groups_avail)
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135 {
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136 my_prep_ptr prep = (my_prep_ptr) cinfo->prep;
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137 int numrows, ci;
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138 JDIMENSION inrows;
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139 jpeg_component_info * compptr;
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140
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141 while (*in_row_ctr < in_rows_avail &&
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142 *out_row_group_ctr < out_row_groups_avail) {
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parents:
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143 /* Do color conversion to fill the conversion buffer. */
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144 inrows = in_rows_avail - *in_row_ctr;
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145 numrows = cinfo->max_v_samp_factor - prep->next_buf_row;
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146 numrows = (int) MIN((JDIMENSION) numrows, inrows);
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parents:
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147 (*cinfo->cconvert->color_convert) (cinfo, input_buf + *in_row_ctr,
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148 prep->color_buf,
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149 (JDIMENSION) prep->next_buf_row,
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parents:
diff changeset
150 numrows);
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151 *in_row_ctr += numrows;
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152 prep->next_buf_row += numrows;
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153 prep->rows_to_go -= numrows;
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parents:
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154 /* If at bottom of image, pad to fill the conversion buffer. */
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parents:
diff changeset
155 if (prep->rows_to_go == 0 &&
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
156 prep->next_buf_row < cinfo->max_v_samp_factor) {
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parents:
diff changeset
157 for (ci = 0; ci < cinfo->num_components; ci++) {
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parents:
diff changeset
158 expand_bottom_edge(prep->color_buf[ci], cinfo->image_width,
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parents:
diff changeset
159 prep->next_buf_row, cinfo->max_v_samp_factor);
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parents:
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160 }
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parents:
diff changeset
161 prep->next_buf_row = cinfo->max_v_samp_factor;
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162 }
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parents:
diff changeset
163 /* If we've filled the conversion buffer, empty it. */
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parents:
diff changeset
164 if (prep->next_buf_row == cinfo->max_v_samp_factor) {
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parents:
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165 (*cinfo->downsample->downsample) (cinfo,
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parents:
diff changeset
166 prep->color_buf, (JDIMENSION) 0,
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parents:
diff changeset
167 output_buf, *out_row_group_ctr);
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parents:
diff changeset
168 prep->next_buf_row = 0;
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parents:
diff changeset
169 (*out_row_group_ctr)++;
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170 }
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parents:
diff changeset
171 /* If at bottom of image, pad the output to a full iMCU height.
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parents:
diff changeset
172 * Note we assume the caller is providing a one-iMCU-height output buffer!
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parents:
diff changeset
173 */
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parents:
diff changeset
174 if (prep->rows_to_go == 0 &&
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
175 *out_row_group_ctr < out_row_groups_avail) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
176 for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
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parents:
diff changeset
177 ci++, compptr++) {
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parents:
diff changeset
178 numrows = (compptr->v_samp_factor * compptr->DCT_v_scaled_size) /
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
179 cinfo->min_DCT_v_scaled_size;
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parents:
diff changeset
180 expand_bottom_edge(output_buf[ci],
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
181 compptr->width_in_blocks * compptr->DCT_h_scaled_size,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
182 (int) (*out_row_group_ctr * numrows),
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parents:
diff changeset
183 (int) (out_row_groups_avail * numrows));
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parents:
diff changeset
184 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
185 *out_row_group_ctr = out_row_groups_avail;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
186 break; /* can exit outer loop without test */
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
187 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
188 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
189 }
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parents:
diff changeset
190
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parents:
diff changeset
191
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
192 #ifdef CONTEXT_ROWS_SUPPORTED
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parents:
diff changeset
193
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
194 /*
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
195 * Process some data in the context case.
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
196 */
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
197
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
198 METHODDEF(void)
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
199 pre_process_context (j_compress_ptr cinfo,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
200 JSAMPARRAY input_buf, JDIMENSION *in_row_ctr,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
201 JDIMENSION in_rows_avail,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
202 JSAMPIMAGE output_buf, JDIMENSION *out_row_group_ctr,
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
203 JDIMENSION out_row_groups_avail)
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
204 {
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
205 my_prep_ptr prep = (my_prep_ptr) cinfo->prep;
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
206 int numrows, ci;
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
207 int buf_height = cinfo->max_v_samp_factor * 3;
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
208 JDIMENSION inrows;
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parents:
diff changeset
209
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
210 while (*out_row_group_ctr < out_row_groups_avail) {
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
211 if (*in_row_ctr < in_rows_avail) {
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
212 /* Do color conversion to fill the conversion buffer. */
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
213 inrows = in_rows_avail - *in_row_ctr;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
214 numrows = prep->next_buf_stop - prep->next_buf_row;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
215 numrows = (int) MIN((JDIMENSION) numrows, inrows);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
216 (*cinfo->cconvert->color_convert) (cinfo, input_buf + *in_row_ctr,
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
217 prep->color_buf,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
218 (JDIMENSION) prep->next_buf_row,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
219 numrows);
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
220 /* Pad at top of image, if first time through */
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
221 if (prep->rows_to_go == cinfo->image_height) {
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
222 for (ci = 0; ci < cinfo->num_components; ci++) {
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
223 int row;
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
224 for (row = 1; row <= cinfo->max_v_samp_factor; row++) {
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
225 jcopy_sample_rows(prep->color_buf[ci],
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
226 prep->color_buf[ci] - row,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
227 1, cinfo->image_width);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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228 }
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parents:
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229 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
230 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
231 *in_row_ctr += numrows;
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
232 prep->next_buf_row += numrows;
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
233 prep->rows_to_go -= numrows;
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
234 } else {
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
235 /* Return for more data, unless we are at the bottom of the image. */
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
236 if (prep->rows_to_go != 0)
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
237 break;
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
238 /* When at bottom of image, pad to fill the conversion buffer. */
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
239 if (prep->next_buf_row < prep->next_buf_stop) {
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
240 for (ci = 0; ci < cinfo->num_components; ci++) {
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
241 expand_bottom_edge(prep->color_buf[ci], cinfo->image_width,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
242 prep->next_buf_row, prep->next_buf_stop);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
243 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
244 prep->next_buf_row = prep->next_buf_stop;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
245 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
246 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
247 /* If we've gotten enough data, downsample a row group. */
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
248 if (prep->next_buf_row == prep->next_buf_stop) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
249 (*cinfo->downsample->downsample) (cinfo,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
250 prep->color_buf,
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
251 (JDIMENSION) prep->this_row_group,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
252 output_buf, *out_row_group_ctr);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
253 (*out_row_group_ctr)++;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
254 /* Advance pointers with wraparound as necessary. */
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
255 prep->this_row_group += cinfo->max_v_samp_factor;
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
256 if (prep->this_row_group >= buf_height)
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
257 prep->this_row_group = 0;
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
258 if (prep->next_buf_row >= buf_height)
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
259 prep->next_buf_row = 0;
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
260 prep->next_buf_stop = prep->next_buf_row + cinfo->max_v_samp_factor;
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
261 }
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
262 }
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
263 }
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
264
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
265
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
266 /*
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
267 * Create the wrapped-around downsampling input buffer needed for context mode.
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
268 */
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
269
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
270 LOCAL(void)
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
271 create_context_buffer (j_compress_ptr cinfo)
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
272 {
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
273 my_prep_ptr prep = (my_prep_ptr) cinfo->prep;
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
274 int rgroup_height = cinfo->max_v_samp_factor;
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
275 int ci, i;
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
276 jpeg_component_info * compptr;
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
277 JSAMPARRAY true_buffer, fake_buffer;
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
278
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
279 /* Grab enough space for fake row pointers for all the components;
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
280 * we need five row groups' worth of pointers for each component.
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
281 */
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
282 fake_buffer = (JSAMPARRAY) (*cinfo->mem->alloc_small)
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
283 ((j_common_ptr) cinfo, JPOOL_IMAGE,
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
284 (cinfo->num_components * 5 * rgroup_height) * SIZEOF(JSAMPROW));
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
285
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
286 for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
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
287 ci++, compptr++) {
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
288 /* Allocate the actual buffer space (3 row groups) for this component.
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
289 * We make the buffer wide enough to allow the downsampler to edge-expand
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
290 * horizontally within the buffer, if it so chooses.
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
291 */
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
292 true_buffer = (*cinfo->mem->alloc_sarray)
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
293 ((j_common_ptr) cinfo, JPOOL_IMAGE,
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
294 (JDIMENSION) (((long) compptr->width_in_blocks *
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
295 cinfo->min_DCT_h_scaled_size *
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
296 cinfo->max_h_samp_factor) / compptr->h_samp_factor),
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297 (JDIMENSION) (3 * rgroup_height));
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298 /* Copy true buffer row pointers into the middle of the fake row array */
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299 MEMCOPY(fake_buffer + rgroup_height, true_buffer,
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300 3 * rgroup_height * SIZEOF(JSAMPROW));
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301 /* Fill in the above and below wraparound pointers */
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parents:
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302 for (i = 0; i < rgroup_height; i++) {
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303 fake_buffer[i] = true_buffer[2 * rgroup_height + i];
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304 fake_buffer[4 * rgroup_height + i] = true_buffer[i];
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305 }
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306 prep->color_buf[ci] = fake_buffer + rgroup_height;
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307 fake_buffer += 5 * rgroup_height; /* point to space for next component */
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308 }
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309 }
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310
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311 #endif /* CONTEXT_ROWS_SUPPORTED */
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312
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313
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314 /*
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315 * Initialize preprocessing controller.
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316 */
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317
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318 GLOBAL(void)
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319 jinit_c_prep_controller (j_compress_ptr cinfo, boolean need_full_buffer)
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320 {
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321 my_prep_ptr prep;
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322 int ci;
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parents:
diff changeset
323 jpeg_component_info * compptr;
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324
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325 if (need_full_buffer) /* safety check */
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parents:
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326 ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
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parents:
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327
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parents:
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328 prep = (my_prep_ptr) (*cinfo->mem->alloc_small)
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parents:
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329 ((j_common_ptr) cinfo, JPOOL_IMAGE, SIZEOF(my_prep_controller));
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parents:
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330 cinfo->prep = &prep->pub;
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parents:
diff changeset
331 prep->pub.start_pass = start_pass_prep;
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parents:
diff changeset
332
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parents:
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333 /* Allocate the color conversion buffer.
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parents:
diff changeset
334 * We make the buffer wide enough to allow the downsampler to edge-expand
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
335 * horizontally within the buffer, if it so chooses.
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parents:
diff changeset
336 */
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
337 if (cinfo->downsample->need_context_rows) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
338 /* Set up to provide context rows */
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
339 #ifdef CONTEXT_ROWS_SUPPORTED
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parents:
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340 prep->pub.pre_process_data = pre_process_context;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
341 create_context_buffer(cinfo);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
342 #else
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parents:
diff changeset
343 ERREXIT(cinfo, JERR_NOT_COMPILED);
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parents:
diff changeset
344 #endif
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parents:
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345 } else {
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parents:
diff changeset
346 /* No context, just make it tall enough for one row group */
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
347 prep->pub.pre_process_data = pre_process_data;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
348 for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
349 ci++, compptr++) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
350 prep->color_buf[ci] = (*cinfo->mem->alloc_sarray)
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
351 ((j_common_ptr) cinfo, JPOOL_IMAGE,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
352 (JDIMENSION) (((long) compptr->width_in_blocks *
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
353 cinfo->min_DCT_h_scaled_size *
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
354 cinfo->max_h_samp_factor) / compptr->h_samp_factor),
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
355 (JDIMENSION) cinfo->max_v_samp_factor);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
356 }
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
357 }
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
358 }