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6417 | ashmew2 | 1 | /* |
2 | * rdrle.c |
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3 | * |
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4 | * Copyright (C) 1991-1996, Thomas G. Lane. |
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5 | * This file is part of the Independent JPEG Group's software. |
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6 | * For conditions of distribution and use, see the accompanying README file. |
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7 | * |
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8 | * This file contains routines to read input images in Utah RLE format. |
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9 | * The Utah Raster Toolkit library is required (version 3.1 or later). |
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10 | * |
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11 | * These routines may need modification for non-Unix environments or |
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12 | * specialized applications. As they stand, they assume input from |
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13 | * an ordinary stdio stream. They further assume that reading begins |
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14 | * at the start of the file; start_input may need work if the |
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15 | * user interface has already read some data (e.g., to determine that |
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16 | * the file is indeed RLE format). |
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17 | * |
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18 | * Based on code contributed by Mike Lijewski, |
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19 | * with updates from Robert Hutchinson. |
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20 | */ |
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21 | |||
22 | #include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */ |
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23 | |||
24 | #ifdef RLE_SUPPORTED |
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25 | |||
26 | /* rle.h is provided by the Utah Raster Toolkit. */ |
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27 | |||
28 | #include |
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29 | |||
30 | /* |
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31 | * We assume that JSAMPLE has the same representation as rle_pixel, |
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32 | * to wit, "unsigned char". Hence we can't cope with 12- or 16-bit samples. |
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33 | */ |
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34 | |||
35 | #if BITS_IN_JSAMPLE != 8 |
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36 | Sorry, this code only copes with 8-bit JSAMPLEs. /* deliberate syntax err */ |
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37 | #endif |
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38 | |||
39 | /* |
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40 | * We support the following types of RLE files: |
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41 | * |
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42 | * GRAYSCALE - 8 bits, no colormap |
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43 | * MAPPEDGRAY - 8 bits, 1 channel colomap |
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44 | * PSEUDOCOLOR - 8 bits, 3 channel colormap |
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45 | * TRUECOLOR - 24 bits, 3 channel colormap |
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46 | * DIRECTCOLOR - 24 bits, no colormap |
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47 | * |
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48 | * For now, we ignore any alpha channel in the image. |
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49 | */ |
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50 | |||
51 | typedef enum |
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52 | { GRAYSCALE, MAPPEDGRAY, PSEUDOCOLOR, TRUECOLOR, DIRECTCOLOR } rle_kind; |
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53 | |||
54 | |||
55 | /* |
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56 | * Since RLE stores scanlines bottom-to-top, we have to invert the image |
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57 | * to conform to JPEG's top-to-bottom order. To do this, we read the |
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58 | * incoming image into a virtual array on the first get_pixel_rows call, |
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59 | * then fetch the required row from the virtual array on subsequent calls. |
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60 | */ |
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61 | |||
62 | typedef struct _rle_source_struct * rle_source_ptr; |
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63 | |||
64 | typedef struct _rle_source_struct { |
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65 | struct cjpeg_source_struct pub; /* public fields */ |
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66 | |||
67 | rle_kind visual; /* actual type of input file */ |
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68 | jvirt_sarray_ptr image; /* virtual array to hold the image */ |
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69 | JDIMENSION row; /* current row # in the virtual array */ |
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70 | rle_hdr header; /* Input file information */ |
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71 | rle_pixel** rle_row; /* holds a row returned by rle_getrow() */ |
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72 | |||
73 | } rle_source_struct; |
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74 | |||
75 | |||
76 | /* |
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77 | * Read the file header; return image size and component count. |
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78 | */ |
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79 | |||
80 | METHODDEF(void) |
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81 | start_input_rle (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) |
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82 | { |
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83 | rle_source_ptr source = (rle_source_ptr) sinfo; |
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84 | JDIMENSION width, height; |
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85 | #ifdef PROGRESS_REPORT |
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86 | cd_progress_ptr progress = (cd_progress_ptr) cinfo->progress; |
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87 | #endif |
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88 | |||
89 | /* Use RLE library routine to get the header info */ |
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90 | source->header = *rle_hdr_init(NULL); |
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91 | source->header.rle_file = source->pub.input_file; |
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92 | switch (rle_get_setup(&(source->header))) { |
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93 | case RLE_SUCCESS: |
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94 | /* A-OK */ |
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95 | break; |
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96 | case RLE_NOT_RLE: |
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97 | ERREXIT(cinfo, JERR_RLE_NOT); |
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98 | break; |
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99 | case RLE_NO_SPACE: |
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100 | ERREXIT(cinfo, JERR_RLE_MEM); |
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101 | break; |
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102 | case RLE_EMPTY: |
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103 | ERREXIT(cinfo, JERR_RLE_EMPTY); |
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104 | break; |
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105 | case RLE_EOF: |
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106 | ERREXIT(cinfo, JERR_RLE_EOF); |
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107 | break; |
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108 | default: |
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109 | ERREXIT(cinfo, JERR_RLE_BADERROR); |
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110 | break; |
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111 | } |
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112 | |||
113 | /* Figure out what we have, set private vars and return values accordingly */ |
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114 | |||
115 | width = source->header.xmax - source->header.xmin + 1; |
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116 | height = source->header.ymax - source->header.ymin + 1; |
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117 | source->header.xmin = 0; /* realign horizontally */ |
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118 | source->header.xmax = width-1; |
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119 | |||
120 | cinfo->image_width = width; |
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121 | cinfo->image_height = height; |
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122 | cinfo->data_precision = 8; /* we can only handle 8 bit data */ |
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123 | |||
124 | if (source->header.ncolors == 1 && source->header.ncmap == 0) { |
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125 | source->visual = GRAYSCALE; |
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126 | TRACEMS2(cinfo, 1, JTRC_RLE_GRAY, width, height); |
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127 | } else if (source->header.ncolors == 1 && source->header.ncmap == 1) { |
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128 | source->visual = MAPPEDGRAY; |
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129 | TRACEMS3(cinfo, 1, JTRC_RLE_MAPGRAY, width, height, |
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130 | 1 << source->header.cmaplen); |
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131 | } else if (source->header.ncolors == 1 && source->header.ncmap == 3) { |
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132 | source->visual = PSEUDOCOLOR; |
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133 | TRACEMS3(cinfo, 1, JTRC_RLE_MAPPED, width, height, |
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134 | 1 << source->header.cmaplen); |
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135 | } else if (source->header.ncolors == 3 && source->header.ncmap == 3) { |
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136 | source->visual = TRUECOLOR; |
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137 | TRACEMS3(cinfo, 1, JTRC_RLE_FULLMAP, width, height, |
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138 | 1 << source->header.cmaplen); |
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139 | } else if (source->header.ncolors == 3 && source->header.ncmap == 0) { |
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140 | source->visual = DIRECTCOLOR; |
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141 | TRACEMS2(cinfo, 1, JTRC_RLE, width, height); |
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142 | } else |
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143 | ERREXIT(cinfo, JERR_RLE_UNSUPPORTED); |
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144 | |||
145 | if (source->visual == GRAYSCALE || source->visual == MAPPEDGRAY) { |
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146 | cinfo->in_color_space = JCS_GRAYSCALE; |
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147 | cinfo->input_components = 1; |
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148 | } else { |
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149 | cinfo->in_color_space = JCS_RGB; |
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150 | cinfo->input_components = 3; |
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151 | } |
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152 | |||
153 | /* |
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154 | * A place to hold each scanline while it's converted. |
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155 | * (GRAYSCALE scanlines don't need converting) |
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156 | */ |
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157 | if (source->visual != GRAYSCALE) { |
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158 | source->rle_row = (rle_pixel**) (*cinfo->mem->alloc_sarray) |
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159 | ((j_common_ptr) cinfo, JPOOL_IMAGE, |
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160 | (JDIMENSION) width, (JDIMENSION) cinfo->input_components); |
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161 | } |
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162 | |||
163 | /* request a virtual array to hold the image */ |
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164 | source->image = (*cinfo->mem->request_virt_sarray) |
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165 | ((j_common_ptr) cinfo, JPOOL_IMAGE, FALSE, |
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166 | (JDIMENSION) (width * source->header.ncolors), |
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167 | (JDIMENSION) height, (JDIMENSION) 1); |
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168 | |||
169 | #ifdef PROGRESS_REPORT |
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170 | if (progress != NULL) { |
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171 | /* count file input as separate pass */ |
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172 | progress->total_extra_passes++; |
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173 | } |
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174 | #endif |
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175 | |||
176 | source->pub.buffer_height = 1; |
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177 | } |
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178 | |||
179 | |||
180 | /* |
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181 | * Read one row of pixels. |
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182 | * Called only after load_image has read the image into the virtual array. |
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183 | * Used for GRAYSCALE, MAPPEDGRAY, TRUECOLOR, and DIRECTCOLOR images. |
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184 | */ |
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185 | |||
186 | METHODDEF(JDIMENSION) |
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187 | get_rle_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) |
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188 | { |
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189 | rle_source_ptr source = (rle_source_ptr) sinfo; |
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190 | |||
191 | source->row--; |
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192 | source->pub.buffer = (*cinfo->mem->access_virt_sarray) |
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193 | ((j_common_ptr) cinfo, source->image, source->row, (JDIMENSION) 1, FALSE); |
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194 | |||
195 | return 1; |
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196 | } |
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197 | |||
198 | /* |
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199 | * Read one row of pixels. |
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200 | * Called only after load_image has read the image into the virtual array. |
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201 | * Used for PSEUDOCOLOR images. |
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202 | */ |
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203 | |||
204 | METHODDEF(JDIMENSION) |
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205 | get_pseudocolor_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) |
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206 | { |
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207 | rle_source_ptr source = (rle_source_ptr) sinfo; |
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208 | JSAMPROW src_row, dest_row; |
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209 | JDIMENSION col; |
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210 | rle_map *colormap; |
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211 | int val; |
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212 | |||
213 | colormap = source->header.cmap; |
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214 | dest_row = source->pub.buffer[0]; |
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215 | source->row--; |
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216 | src_row = * (*cinfo->mem->access_virt_sarray) |
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217 | ((j_common_ptr) cinfo, source->image, source->row, (JDIMENSION) 1, FALSE); |
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218 | |||
219 | for (col = cinfo->image_width; col > 0; col--) { |
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220 | val = GETJSAMPLE(*src_row++); |
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221 | *dest_row++ = (JSAMPLE) (colormap[val ] >> 8); |
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222 | *dest_row++ = (JSAMPLE) (colormap[val + 256] >> 8); |
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223 | *dest_row++ = (JSAMPLE) (colormap[val + 512] >> 8); |
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224 | } |
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225 | |||
226 | return 1; |
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227 | } |
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228 | |||
229 | |||
230 | /* |
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231 | * Load the image into a virtual array. We have to do this because RLE |
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232 | * files start at the lower left while the JPEG standard has them starting |
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233 | * in the upper left. This is called the first time we want to get a row |
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234 | * of input. What we do is load the RLE data into the array and then call |
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235 | * the appropriate routine to read one row from the array. Before returning, |
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236 | * we set source->pub.get_pixel_rows so that subsequent calls go straight to |
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237 | * the appropriate row-reading routine. |
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238 | */ |
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239 | |||
240 | METHODDEF(JDIMENSION) |
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241 | load_image (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) |
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242 | { |
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243 | rle_source_ptr source = (rle_source_ptr) sinfo; |
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244 | JDIMENSION row, col; |
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245 | JSAMPROW scanline, red_ptr, green_ptr, blue_ptr; |
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246 | rle_pixel **rle_row; |
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247 | rle_map *colormap; |
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248 | char channel; |
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249 | #ifdef PROGRESS_REPORT |
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250 | cd_progress_ptr progress = (cd_progress_ptr) cinfo->progress; |
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251 | #endif |
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252 | |||
253 | colormap = source->header.cmap; |
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254 | rle_row = source->rle_row; |
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255 | |||
256 | /* Read the RLE data into our virtual array. |
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257 | * We assume here that (a) rle_pixel is represented the same as JSAMPLE, |
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258 | * and (b) we are not on a machine where FAR pointers differ from regular. |
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259 | */ |
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260 | RLE_CLR_BIT(source->header, RLE_ALPHA); /* don't read the alpha channel */ |
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261 | |||
262 | #ifdef PROGRESS_REPORT |
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263 | if (progress != NULL) { |
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264 | progress->pub.pass_limit = cinfo->image_height; |
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265 | progress->pub.pass_counter = 0; |
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266 | (*progress->pub.progress_monitor) ((j_common_ptr) cinfo); |
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267 | } |
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268 | #endif |
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269 | |||
270 | switch (source->visual) { |
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271 | |||
272 | case GRAYSCALE: |
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273 | case PSEUDOCOLOR: |
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274 | for (row = 0; row < cinfo->image_height; row++) { |
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275 | rle_row = (rle_pixel **) (*cinfo->mem->access_virt_sarray) |
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276 | ((j_common_ptr) cinfo, source->image, row, (JDIMENSION) 1, TRUE); |
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277 | rle_getrow(&source->header, rle_row); |
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278 | #ifdef PROGRESS_REPORT |
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279 | if (progress != NULL) { |
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280 | progress->pub.pass_counter++; |
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281 | (*progress->pub.progress_monitor) ((j_common_ptr) cinfo); |
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282 | } |
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283 | #endif |
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284 | } |
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285 | break; |
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286 | |||
287 | case MAPPEDGRAY: |
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288 | case TRUECOLOR: |
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289 | for (row = 0; row < cinfo->image_height; row++) { |
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290 | scanline = * (*cinfo->mem->access_virt_sarray) |
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291 | ((j_common_ptr) cinfo, source->image, row, (JDIMENSION) 1, TRUE); |
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292 | rle_row = source->rle_row; |
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293 | rle_getrow(&source->header, rle_row); |
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294 | |||
295 | for (col = 0; col < cinfo->image_width; col++) { |
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296 | for (channel = 0; channel < source->header.ncolors; channel++) { |
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297 | *scanline++ = (JSAMPLE) |
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298 | (colormap[GETJSAMPLE(rle_row[channel][col]) + 256 * channel] >> 8); |
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299 | } |
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300 | } |
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301 | |||
302 | #ifdef PROGRESS_REPORT |
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303 | if (progress != NULL) { |
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304 | progress->pub.pass_counter++; |
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305 | (*progress->pub.progress_monitor) ((j_common_ptr) cinfo); |
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306 | } |
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307 | #endif |
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308 | } |
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309 | break; |
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310 | |||
311 | case DIRECTCOLOR: |
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312 | for (row = 0; row < cinfo->image_height; row++) { |
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313 | scanline = * (*cinfo->mem->access_virt_sarray) |
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314 | ((j_common_ptr) cinfo, source->image, row, (JDIMENSION) 1, TRUE); |
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315 | rle_getrow(&source->header, rle_row); |
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316 | |||
317 | red_ptr = rle_row[0]; |
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318 | green_ptr = rle_row[1]; |
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319 | blue_ptr = rle_row[2]; |
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320 | |||
321 | for (col = cinfo->image_width; col > 0; col--) { |
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322 | *scanline++ = *red_ptr++; |
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323 | *scanline++ = *green_ptr++; |
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324 | *scanline++ = *blue_ptr++; |
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325 | } |
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326 | |||
327 | #ifdef PROGRESS_REPORT |
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328 | if (progress != NULL) { |
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329 | progress->pub.pass_counter++; |
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330 | (*progress->pub.progress_monitor) ((j_common_ptr) cinfo); |
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331 | } |
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332 | #endif |
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333 | } |
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334 | } |
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335 | |||
336 | #ifdef PROGRESS_REPORT |
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337 | if (progress != NULL) |
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338 | progress->completed_extra_passes++; |
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339 | #endif |
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340 | |||
341 | /* Set up to call proper row-extraction routine in future */ |
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342 | if (source->visual == PSEUDOCOLOR) { |
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343 | source->pub.buffer = source->rle_row; |
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344 | source->pub.get_pixel_rows = get_pseudocolor_row; |
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345 | } else { |
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346 | source->pub.get_pixel_rows = get_rle_row; |
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347 | } |
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348 | source->row = cinfo->image_height; |
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349 | |||
350 | /* And fetch the topmost (bottommost) row */ |
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351 | return (*source->pub.get_pixel_rows) (cinfo, sinfo); |
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352 | } |
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353 | |||
354 | |||
355 | /* |
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356 | * Finish up at the end of the file. |
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357 | */ |
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358 | |||
359 | METHODDEF(void) |
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360 | finish_input_rle (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) |
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361 | { |
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362 | /* no work */ |
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363 | } |
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364 | |||
365 | |||
366 | /* |
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367 | * The module selection routine for RLE format input. |
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368 | */ |
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369 | |||
370 | GLOBAL(cjpeg_source_ptr) |
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371 | jinit_read_rle (j_compress_ptr cinfo) |
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372 | { |
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373 | rle_source_ptr source; |
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374 | |||
375 | /* Create module interface object */ |
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376 | source = (rle_source_ptr) |
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377 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
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378 | SIZEOF(rle_source_struct)); |
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379 | /* Fill in method ptrs */ |
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380 | source->pub.start_input = start_input_rle; |
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381 | source->pub.finish_input = finish_input_rle; |
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382 | source->pub.get_pixel_rows = load_image; |
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383 | |||
384 | return (cjpeg_source_ptr) source; |
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385 | } |
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386 | |||
387 | #endif /* RLE_SUPPORTED */>>>>>><>><>><> |