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annotate mupdf-source/thirdparty/libjpeg/jdsample.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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * jdsample.c
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3 *
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4 * Copyright (C) 1991-1996, Thomas G. Lane.
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5 * Modified 2002-2020 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 upsampling routines.
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10 *
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11 * Upsampling input data is counted in "row groups". A row group
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12 * is defined to be (v_samp_factor * DCT_v_scaled_size / min_DCT_v_scaled_size)
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13 * sample rows of each component. Upsampling will normally produce
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14 * max_v_samp_factor pixel rows from each row group (but this could vary
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15 * if the upsampler is applying a scale factor of its own).
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16 *
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17 * An excellent reference for image resampling is
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18 * Digital Image Warping, George Wolberg, 1990.
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19 * Pub. by IEEE Computer Society Press, Los Alamitos, CA. ISBN 0-8186-8944-7.
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20 */
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22 #define JPEG_INTERNALS
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23 #include "jinclude.h"
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24 #include "jpeglib.h"
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27 /* Pointer to routine to upsample a single component */
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28 typedef JMETHOD(void, upsample1_ptr,
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29 (j_decompress_ptr cinfo, jpeg_component_info * compptr,
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30 JSAMPARRAY input_data, JSAMPIMAGE output_data_ptr));
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32 /* Private subobject */
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34 typedef struct {
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35 struct jpeg_upsampler pub; /* public fields */
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37 /* Color conversion buffer. When using separate upsampling and color
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38 * conversion steps, this buffer holds one upsampled row group until it
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39 * has been color converted and output.
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40 * Note: we do not allocate any storage for component(s) which are full-size,
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41 * ie do not need rescaling. The corresponding entry of color_buf[] is
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42 * simply set to point to the input data array, thereby avoiding copying.
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43 */
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44 JSAMPARRAY color_buf[MAX_COMPONENTS];
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46 /* Per-component upsampling method pointers */
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47 upsample1_ptr methods[MAX_COMPONENTS];
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49 int next_row_out; /* counts rows emitted from color_buf */
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50 JDIMENSION rows_to_go; /* counts rows remaining in image */
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52 /* Height of an input row group for each component. */
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53 int rowgroup_height[MAX_COMPONENTS];
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54
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55 /* These arrays save pixel expansion factors so that int_expand need not
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56 * recompute them each time. They are unused for other upsampling methods.
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57 */
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58 UINT8 h_expand[MAX_COMPONENTS];
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59 UINT8 v_expand[MAX_COMPONENTS];
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60 } my_upsampler;
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62 typedef my_upsampler * my_upsample_ptr;
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65 /*
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66 * Initialize for an upsampling pass.
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67 */
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69 METHODDEF(void)
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70 start_pass_upsample (j_decompress_ptr cinfo)
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71 {
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72 my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
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74 /* Mark the conversion buffer empty */
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75 upsample->next_row_out = cinfo->max_v_samp_factor;
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76 /* Initialize total-height counter for detecting bottom of image */
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77 upsample->rows_to_go = cinfo->output_height;
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78 }
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81 /*
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82 * Control routine to do upsampling (and color conversion).
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83 *
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84 * In this version we upsample each component independently.
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85 * We upsample one row group into the conversion buffer, then apply
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86 * color conversion a row at a time.
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87 */
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89 METHODDEF(void)
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90 sep_upsample (j_decompress_ptr cinfo,
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91 JSAMPIMAGE input_buf, JDIMENSION *in_row_group_ctr,
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92 JDIMENSION in_row_groups_avail,
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93 JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
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94 JDIMENSION out_rows_avail)
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95 {
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96 my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
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97 int ci;
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98 jpeg_component_info * compptr;
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99 JDIMENSION num_rows;
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parents:
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100
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parents:
diff changeset
101 /* Fill the conversion buffer, if it's empty */
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parents:
diff changeset
102 if (upsample->next_row_out >= cinfo->max_v_samp_factor) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
103 for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
104 ci++, compptr++) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
105 /* Don't bother to upsample an uninteresting component. */
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
106 if (! compptr->component_needed)
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
107 continue;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
108 /* Invoke per-component upsample method. Notice we pass a POINTER
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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109 * to color_buf[ci], so that fullsize_upsample can change it.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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110 */
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parents:
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111 (*upsample->methods[ci]) (cinfo, compptr,
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Franz Glasner <fzglas.hg@dom66.de>
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diff changeset
112 input_buf[ci] + (*in_row_group_ctr * upsample->rowgroup_height[ci]),
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
113 upsample->color_buf + ci);
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parents:
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114 }
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Franz Glasner <fzglas.hg@dom66.de>
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115 upsample->next_row_out = 0;
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116 }
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117
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parents:
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118 /* Color-convert and emit rows */
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parents:
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119
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parents:
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120 /* How many we have in the buffer: */
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Franz Glasner <fzglas.hg@dom66.de>
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121 num_rows = (JDIMENSION) (cinfo->max_v_samp_factor - upsample->next_row_out);
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parents:
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122 /* Not more than the distance to the end of the image. Need this test
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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123 * in case the image height is not a multiple of max_v_samp_factor:
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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124 */
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parents:
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125 if (num_rows > upsample->rows_to_go)
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126 num_rows = upsample->rows_to_go;
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parents:
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127 /* And not more than what the client can accept: */
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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128 out_rows_avail -= *out_row_ctr;
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parents:
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129 if (num_rows > out_rows_avail)
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parents:
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130 num_rows = out_rows_avail;
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parents:
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131
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parents:
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132 (*cinfo->cconvert->color_convert) (cinfo, upsample->color_buf,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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133 (JDIMENSION) upsample->next_row_out,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
134 output_buf + *out_row_ctr,
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parents:
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135 (int) num_rows);
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parents:
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136
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
137 /* Adjust counts */
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
138 *out_row_ctr += num_rows;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
139 upsample->rows_to_go -= num_rows;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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140 upsample->next_row_out += num_rows;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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141 /* When the buffer is emptied, declare this input row group consumed */
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
142 if (upsample->next_row_out >= cinfo->max_v_samp_factor)
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
143 (*in_row_group_ctr)++;
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parents:
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144 }
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parents:
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145
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parents:
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146
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
147 /*
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parents:
diff changeset
148 * These are the routines invoked by sep_upsample to upsample pixel values
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parents:
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149 * of a single component. One row group is processed per call.
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parents:
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150 */
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parents:
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151
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parents:
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152
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
153 /*
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parents:
diff changeset
154 * For full-size components, we just make color_buf[ci] point at the
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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155 * input buffer, and thus avoid copying any data. Note that this is
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:
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156 * safe only because sep_upsample doesn't declare the input row group
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
157 * "consumed" until we are done color converting and emitting it.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
158 */
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parents:
diff changeset
159
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
160 METHODDEF(void)
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
161 fullsize_upsample (j_decompress_ptr cinfo, jpeg_component_info * compptr,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
162 JSAMPARRAY input_data, JSAMPIMAGE output_data_ptr)
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parents:
diff changeset
163 {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
164 *output_data_ptr = input_data;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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165 }
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parents:
diff changeset
166
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parents:
diff changeset
167
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
168 /*
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
169 * This version handles any integral sampling ratios.
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parents:
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170 * This is not used for typical JPEG files, so it need not be fast.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
171 * Nor, for that matter, is it particularly accurate: the algorithm is
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
172 * simple replication of the input pixel onto the corresponding output
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
173 * pixels. The hi-falutin sampling literature refers to this as a
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
174 * "box filter". A box filter tends to introduce visible artifacts,
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
175 * so if you are actually going to use 3:1 or 4:1 sampling ratios
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
176 * you would be well advised to improve this code.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
177 */
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parents:
diff changeset
178
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parents:
diff changeset
179 METHODDEF(void)
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
180 int_upsample (j_decompress_ptr cinfo, jpeg_component_info * compptr,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
181 JSAMPARRAY input_data, JSAMPIMAGE output_data_ptr)
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parents:
diff changeset
182 {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
183 my_upsample_ptr upsample = (my_upsample_ptr) cinfo->upsample;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
184 JSAMPARRAY output_data, output_end;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
185 register JSAMPROW inptr, outptr;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
186 register JSAMPLE invalue;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
187 register int h;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
188 JSAMPROW outend;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
189 int h_expand, v_expand;
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parents:
diff changeset
190
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
191 h_expand = upsample->h_expand[compptr->component_index];
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
192 v_expand = upsample->v_expand[compptr->component_index];
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parents:
diff changeset
193
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
194 output_data = *output_data_ptr;
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
195 output_end = output_data + cinfo->max_v_samp_factor;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
196 for (; output_data < output_end; output_data += v_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
197 /* Generate one output row with proper horizontal expansion */
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
198 inptr = *input_data++;
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
199 outptr = *output_data;
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
200 outend = outptr + cinfo->output_width;
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
201 while (outptr < outend) {
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
202 invalue = *inptr++; /* don't need GETJSAMPLE() here */
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 for (h = h_expand; h > 0; h--) {
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
204 *outptr++ = invalue;
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 }
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 }
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 /* Generate any additional output rows by duplicating the first one */
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 if (v_expand > 1) {
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
209 jcopy_sample_rows(output_data, output_data + 1,
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
210 v_expand - 1, cinfo->output_width);
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 }
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 }
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
213 }
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
214
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
215
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
216 /*
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 * Fast processing for the common case of 2:1 horizontal and 1:1 vertical.
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
218 * It's still a box filter.
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
219 */
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
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 METHODDEF(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
222 h2v1_upsample (j_decompress_ptr cinfo, 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
223 JSAMPARRAY input_data, JSAMPIMAGE output_data_ptr)
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 {
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 JSAMPARRAY output_data = *output_data_ptr;
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
226 register JSAMPROW inptr, outptr;
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
227 register JSAMPLE invalue;
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
228 JSAMPROW outend;
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
229 int outrow;
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
230
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
231 for (outrow = 0; outrow < cinfo->max_v_samp_factor; outrow++) {
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 inptr = input_data[outrow];
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 outptr = output_data[outrow];
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 outend = outptr + cinfo->output_width;
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 while (outptr < outend) {
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 invalue = *inptr++; /* don't need GETJSAMPLE() here */
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 *outptr++ = invalue;
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 *outptr++ = invalue;
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 }
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 }
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 }
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
242
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
243
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
244 /*
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
245 * Fast processing for the common case of 2:1 horizontal and 2:1 vertical.
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
246 * It's still a box filter.
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
247 */
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
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
249 METHODDEF(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
250 h2v2_upsample (j_decompress_ptr cinfo, 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
251 JSAMPARRAY input_data, JSAMPIMAGE output_data_ptr)
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
252 {
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
253 JSAMPARRAY output_data, output_end;
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
254 register JSAMPROW inptr, outptr;
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
255 register JSAMPLE invalue;
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 JSAMPROW outend;
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
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 output_data = *output_data_ptr;
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 output_end = output_data + 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
260 for (; output_data < output_end; output_data += 2) {
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 inptr = *input_data++;
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 outptr = *output_data;
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 outend = outptr + cinfo->output_width;
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 while (outptr < outend) {
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 invalue = *inptr++; /* don't need GETJSAMPLE() here */
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 *outptr++ = invalue;
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 *outptr++ = invalue;
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 jcopy_sample_rows(output_data, output_data + 1,
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 1, cinfo->output_width);
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 }
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
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
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 /*
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 * Module initialization routine for upsampling.
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 */
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 GLOBAL(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
280 jinit_upsampler (j_decompress_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
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 my_upsample_ptr upsample;
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 int 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
284 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
285 int h_in_group, v_in_group, h_out_group, v_out_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
286
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 upsample = (my_upsample_ptr) (*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
288 ((j_common_ptr) cinfo, JPOOL_IMAGE, SIZEOF(my_upsampler));
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 cinfo->upsample = &upsample->pub;
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 upsample->pub.start_pass = start_pass_upsample;
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 upsample->pub.upsample = sep_upsample;
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 upsample->pub.need_context_rows = FALSE; /* until we find out differently */
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
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 if (cinfo->CCIR601_sampling) /* this isn't supported */
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 ERREXIT(cinfo, JERR_CCIR601_NOTIMPL);
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
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
297 /* Verify we can handle the sampling factors, select per-component methods,
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
298 * and create storage as needed.
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
299 */
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300 for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
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301 ci++, compptr++) {
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302 /* Don't bother to upsample an uninteresting component. */
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303 if (! compptr->component_needed)
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304 continue;
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305 /* Compute size of an "input group" after IDCT scaling. This many samples
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306 * are to be converted to max_h_samp_factor * max_v_samp_factor pixels.
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307 */
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308 h_in_group = (compptr->h_samp_factor * compptr->DCT_h_scaled_size) /
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309 cinfo->min_DCT_h_scaled_size;
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310 v_in_group = (compptr->v_samp_factor * compptr->DCT_v_scaled_size) /
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311 cinfo->min_DCT_v_scaled_size;
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312 h_out_group = cinfo->max_h_samp_factor;
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313 v_out_group = cinfo->max_v_samp_factor;
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314 upsample->rowgroup_height[ci] = v_in_group; /* save for use later */
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315 if (h_in_group == h_out_group && v_in_group == v_out_group) {
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316 /* Fullsize components can be processed without any work. */
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317 upsample->methods[ci] = fullsize_upsample;
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318 continue; /* don't need to allocate buffer */
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319 }
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320 if (h_in_group * 2 == h_out_group && v_in_group == v_out_group) {
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321 /* Special case for 2h1v upsampling */
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322 upsample->methods[ci] = h2v1_upsample;
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323 } else if (h_in_group * 2 == h_out_group &&
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324 v_in_group * 2 == v_out_group) {
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325 /* Special case for 2h2v upsampling */
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326 upsample->methods[ci] = h2v2_upsample;
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327 } else if ((h_out_group % h_in_group) == 0 &&
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328 (v_out_group % v_in_group) == 0) {
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parents:
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329 /* Generic integral-factors upsampling method */
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parents:
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330 upsample->methods[ci] = int_upsample;
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parents:
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331 upsample->h_expand[ci] = (UINT8) (h_out_group / h_in_group);
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parents:
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332 upsample->v_expand[ci] = (UINT8) (v_out_group / v_in_group);
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parents:
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333 } else
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parents:
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334 ERREXIT(cinfo, JERR_FRACT_SAMPLE_NOTIMPL);
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parents:
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335 upsample->color_buf[ci] = (*cinfo->mem->alloc_sarray)
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parents:
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336 ((j_common_ptr) cinfo, JPOOL_IMAGE,
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parents:
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337 (JDIMENSION) jround_up((long) cinfo->output_width,
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parents:
diff changeset
338 (long) cinfo->max_h_samp_factor),
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parents:
diff changeset
339 (JDIMENSION) cinfo->max_v_samp_factor);
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340 }
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parents:
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341 }