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4680 | right-hear | 1 | /* |
2 | * jpeglib.h |
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3 | * |
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4 | * Copyright (C) 1991-1998, 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 defines the application interface for the JPEG library. |
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9 | * Most applications using the library need only include this file, |
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10 | * and perhaps jerror.h if they want to know the exact error codes. |
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11 | */ |
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12 | |||
13 | #ifndef JPEGLIB_H |
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14 | #define JPEGLIB_H |
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15 | |||
16 | /* |
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17 | * First we include the configuration files that record how this |
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18 | * installation of the JPEG library is set up. jconfig.h can be |
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19 | * generated automatically for many systems. jmorecfg.h contains |
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20 | * manual configuration options that most people need not worry about. |
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21 | */ |
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22 | |||
23 | #ifndef JCONFIG_INCLUDED /* in case jinclude.h already did */ |
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24 | #include "jconfig.h" /* widely used configuration options */ |
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25 | #endif |
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26 | #include "jmorecfg.h" /* seldom changed options */ |
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27 | |||
28 | |||
29 | /* Version ID for the JPEG library. |
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30 | * Might be useful for tests like "#if JPEG_LIB_VERSION >= 60". |
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31 | */ |
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32 | |||
33 | #define JPEG_LIB_VERSION 62 /* Version 6b */ |
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34 | |||
35 | |||
36 | /* Various constants determining the sizes of things. |
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37 | * All of these are specified by the JPEG standard, so don't change them |
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38 | * if you want to be compatible. |
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39 | */ |
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40 | |||
41 | #define DCTSIZE 8 /* The basic DCT block is 8x8 samples */ |
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42 | #define DCTSIZE2 64 /* DCTSIZE squared; # of elements in a block */ |
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43 | #define NUM_QUANT_TBLS 4 /* Quantization tables are numbered 0..3 */ |
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44 | #define NUM_HUFF_TBLS 4 /* Huffman tables are numbered 0..3 */ |
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45 | #define NUM_ARITH_TBLS 16 /* Arith-coding tables are numbered 0..15 */ |
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46 | #define MAX_COMPS_IN_SCAN 4 /* JPEG limit on # of components in one scan */ |
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47 | #define MAX_SAMP_FACTOR 4 /* JPEG limit on sampling factors */ |
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48 | /* Unfortunately, some bozo at Adobe saw no reason to be bound by the standard; |
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49 | * the PostScript DCT filter can emit files with many more than 10 blocks/MCU. |
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50 | * If you happen to run across such a file, you can up D_MAX_BLOCKS_IN_MCU |
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51 | * to handle it. We even let you do this from the jconfig.h file. However, |
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52 | * we strongly discourage changing C_MAX_BLOCKS_IN_MCU; just because Adobe |
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53 | * sometimes emits noncompliant files doesn't mean you should too. |
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54 | */ |
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55 | #define C_MAX_BLOCKS_IN_MCU 10 /* compressor's limit on blocks per MCU */ |
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56 | #ifndef D_MAX_BLOCKS_IN_MCU |
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57 | #define D_MAX_BLOCKS_IN_MCU 10 /* decompressor's limit on blocks per MCU */ |
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58 | #endif |
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59 | |||
60 | |||
61 | /* Data structures for images (arrays of samples and of DCT coefficients). |
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62 | * On 80x86 machines, the image arrays are too big for near pointers, |
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63 | * but the pointer arrays can fit in near memory. |
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64 | */ |
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65 | |||
66 | typedef JSAMPLE FAR *JSAMPROW; /* ptr to one image row of pixel samples. */ |
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67 | typedef JSAMPROW *JSAMPARRAY; /* ptr to some rows (a 2-D sample array) */ |
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68 | typedef JSAMPARRAY *JSAMPIMAGE; /* a 3-D sample array: top index is color */ |
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69 | |||
70 | typedef JCOEF JBLOCK[DCTSIZE2]; /* one block of coefficients */ |
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71 | typedef JBLOCK FAR *JBLOCKROW; /* pointer to one row of coefficient blocks */ |
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72 | typedef JBLOCKROW *JBLOCKARRAY; /* a 2-D array of coefficient blocks */ |
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73 | typedef JBLOCKARRAY *JBLOCKIMAGE; /* a 3-D array of coefficient blocks */ |
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74 | |||
75 | typedef JCOEF FAR *JCOEFPTR; /* useful in a couple of places */ |
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76 | |||
77 | |||
78 | /* Types for JPEG compression parameters and working tables. */ |
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79 | |||
80 | |||
81 | /* DCT coefficient quantization tables. */ |
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82 | |||
83 | typedef struct { |
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84 | /* This array gives the coefficient quantizers in natural array order |
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85 | * (not the zigzag order in which they are stored in a JPEG DQT marker). |
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86 | * CAUTION: IJG versions prior to v6a kept this array in zigzag order. |
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87 | */ |
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88 | UINT16 quantval[DCTSIZE2]; /* quantization step for each coefficient */ |
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89 | /* This field is used only during compression. It's initialized FALSE when |
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90 | * the table is created, and set TRUE when it's been output to the file. |
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91 | * You could suppress output of a table by setting this to TRUE. |
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92 | * (See jpeg_suppress_tables for an example.) |
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93 | */ |
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94 | boolean sent_table; /* TRUE when table has been output */ |
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95 | } JQUANT_TBL; |
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96 | |||
97 | |||
98 | /* Huffman coding tables. */ |
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99 | |||
100 | typedef struct { |
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101 | /* These two fields directly represent the contents of a JPEG DHT marker */ |
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102 | UINT8 bits[17]; /* bits[k] = # of symbols with codes of */ |
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103 | /* length k bits; bits[0] is unused */ |
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104 | UINT8 huffval[256]; /* The symbols, in order of incr code length */ |
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105 | /* This field is used only during compression. It's initialized FALSE when |
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106 | * the table is created, and set TRUE when it's been output to the file. |
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107 | * You could suppress output of a table by setting this to TRUE. |
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108 | * (See jpeg_suppress_tables for an example.) |
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109 | */ |
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110 | boolean sent_table; /* TRUE when table has been output */ |
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111 | } JHUFF_TBL; |
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112 | |||
113 | |||
114 | /* Basic info about one component (color channel). */ |
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115 | |||
116 | typedef struct { |
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117 | /* These values are fixed over the whole image. */ |
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118 | /* For compression, they must be supplied by parameter setup; */ |
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119 | /* for decompression, they are read from the SOF marker. */ |
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120 | int component_id; /* identifier for this component (0..255) */ |
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121 | int component_index; /* its index in SOF or cinfo->comp_info[] */ |
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122 | int h_samp_factor; /* horizontal sampling factor (1..4) */ |
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123 | int v_samp_factor; /* vertical sampling factor (1..4) */ |
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124 | int quant_tbl_no; /* quantization table selector (0..3) */ |
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125 | /* These values may vary between scans. */ |
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126 | /* For compression, they must be supplied by parameter setup; */ |
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127 | /* for decompression, they are read from the SOS marker. */ |
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128 | /* The decompressor output side may not use these variables. */ |
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129 | int dc_tbl_no; /* DC entropy table selector (0..3) */ |
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130 | int ac_tbl_no; /* AC entropy table selector (0..3) */ |
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131 | |||
132 | /* Remaining fields should be treated as private by applications. */ |
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133 | |||
134 | /* These values are computed during compression or decompression startup: */ |
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135 | /* Component's size in DCT blocks. |
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136 | * Any dummy blocks added to complete an MCU are not counted; therefore |
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137 | * these values do not depend on whether a scan is interleaved or not. |
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138 | */ |
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139 | JDIMENSION width_in_blocks; |
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140 | JDIMENSION height_in_blocks; |
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141 | /* Size of a DCT block in samples. Always DCTSIZE for compression. |
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142 | * For decompression this is the size of the output from one DCT block, |
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143 | * reflecting any scaling we choose to apply during the IDCT step. |
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144 | * Values of 1,2,4,8 are likely to be supported. Note that different |
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145 | * components may receive different IDCT scalings. |
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146 | */ |
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147 | int DCT_scaled_size; |
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148 | /* The downsampled dimensions are the component's actual, unpadded number |
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149 | * of samples at the main buffer (preprocessing/compression interface), thus |
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150 | * downsampled_width = ceil(image_width * Hi/Hmax) |
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151 | * and similarly for height. For decompression, IDCT scaling is included, so |
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152 | * downsampled_width = ceil(image_width * Hi/Hmax * DCT_scaled_size/DCTSIZE) |
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153 | */ |
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154 | JDIMENSION downsampled_width; /* actual width in samples */ |
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155 | JDIMENSION downsampled_height; /* actual height in samples */ |
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156 | /* This flag is used only for decompression. In cases where some of the |
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157 | * components will be ignored (eg grayscale output from YCbCr image), |
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158 | * we can skip most computations for the unused components. |
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159 | */ |
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160 | boolean component_needed; /* do we need the value of this component? */ |
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161 | |||
162 | /* These values are computed before starting a scan of the component. */ |
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163 | /* The decompressor output side may not use these variables. */ |
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164 | int MCU_width; /* number of blocks per MCU, horizontally */ |
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165 | int MCU_height; /* number of blocks per MCU, vertically */ |
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166 | int MCU_blocks; /* MCU_width * MCU_height */ |
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167 | int MCU_sample_width; /* MCU width in samples, MCU_width*DCT_scaled_size */ |
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168 | int last_col_width; /* # of non-dummy blocks across in last MCU */ |
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169 | int last_row_height; /* # of non-dummy blocks down in last MCU */ |
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170 | |||
171 | /* Saved quantization table for component; NULL if none yet saved. |
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172 | * See jdinput.c comments about the need for this information. |
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173 | * This field is currently used only for decompression. |
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174 | */ |
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175 | JQUANT_TBL * quant_table; |
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176 | |||
177 | /* Private per-component storage for DCT or IDCT subsystem. */ |
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178 | void * dct_table; |
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179 | } jpeg_component_info; |
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180 | |||
181 | |||
182 | /* The script for encoding a multiple-scan file is an array of these: */ |
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183 | |||
184 | typedef struct { |
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185 | int comps_in_scan; /* number of components encoded in this scan */ |
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186 | int component_index[MAX_COMPS_IN_SCAN]; /* their SOF/comp_info[] indexes */ |
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187 | int Ss, Se; /* progressive JPEG spectral selection parms */ |
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188 | int Ah, Al; /* progressive JPEG successive approx. parms */ |
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189 | } jpeg_scan_info; |
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190 | |||
191 | /* The decompressor can save APPn and COM markers in a list of these: */ |
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192 | |||
193 | typedef struct jpeg_marker_struct FAR * jpeg_saved_marker_ptr; |
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194 | |||
195 | struct jpeg_marker_struct { |
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196 | jpeg_saved_marker_ptr next; /* next in list, or NULL */ |
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197 | UINT8 marker; /* marker code: JPEG_COM, or JPEG_APP0+n */ |
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198 | unsigned int original_length; /* # bytes of data in the file */ |
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199 | unsigned int data_length; /* # bytes of data saved at data[] */ |
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200 | JOCTET FAR * data; /* the data contained in the marker */ |
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201 | /* the marker length word is not counted in data_length or original_length */ |
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202 | }; |
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203 | |||
204 | /* Known color spaces. */ |
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205 | |||
206 | typedef enum { |
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207 | JCS_UNKNOWN, /* error/unspecified */ |
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208 | JCS_GRAYSCALE, /* monochrome */ |
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209 | JCS_RGB, /* red/green/blue */ |
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210 | JCS_YCbCr, /* Y/Cb/Cr (also known as YUV) */ |
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211 | JCS_CMYK, /* C/M/Y/K */ |
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212 | JCS_YCCK /* Y/Cb/Cr/K */ |
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213 | } J_COLOR_SPACE; |
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214 | |||
215 | /* DCT/IDCT algorithm options. */ |
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216 | |||
217 | typedef enum { |
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218 | JDCT_ISLOW, /* slow but accurate integer algorithm */ |
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219 | JDCT_IFAST, /* faster, less accurate integer method */ |
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220 | JDCT_FLOAT /* floating-point: accurate, fast on fast HW */ |
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221 | } J_DCT_METHOD; |
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222 | |||
223 | #ifndef JDCT_DEFAULT /* may be overridden in jconfig.h */ |
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224 | #define JDCT_DEFAULT JDCT_ISLOW |
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225 | #endif |
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226 | #ifndef JDCT_FASTEST /* may be overridden in jconfig.h */ |
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227 | #define JDCT_FASTEST JDCT_IFAST |
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228 | #endif |
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229 | |||
230 | /* Dithering options for decompression. */ |
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231 | |||
232 | typedef enum { |
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233 | JDITHER_NONE, /* no dithering */ |
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234 | JDITHER_ORDERED, /* simple ordered dither */ |
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235 | JDITHER_FS /* Floyd-Steinberg error diffusion dither */ |
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236 | } J_DITHER_MODE; |
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237 | |||
238 | |||
239 | /* Common fields between JPEG compression and decompression master structs. */ |
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240 | |||
241 | #define jpeg_common_fields \ |
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242 | struct jpeg_error_mgr * err; /* Error handler module */\ |
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243 | struct jpeg_memory_mgr * mem; /* Memory manager module */\ |
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244 | struct jpeg_progress_mgr * progress; /* Progress monitor, or NULL if none */\ |
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245 | void * client_data; /* Available for use by application */\ |
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246 | boolean is_decompressor; /* So common code can tell which is which */\ |
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247 | int global_state /* For checking call sequence validity */ |
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248 | |||
249 | /* Routines that are to be used by both halves of the library are declared |
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250 | * to receive a pointer to this structure. There are no actual instances of |
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251 | * jpeg_common_struct, only of jpeg_compress_struct and jpeg_decompress_struct. |
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252 | */ |
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253 | struct jpeg_common_struct { |
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254 | jpeg_common_fields; /* Fields common to both master struct types */ |
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255 | /* Additional fields follow in an actual jpeg_compress_struct or |
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256 | * jpeg_decompress_struct. All three structs must agree on these |
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257 | * initial fields! (This would be a lot cleaner in C++.) |
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258 | */ |
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259 | }; |
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260 | |||
261 | typedef struct jpeg_common_struct * j_common_ptr; |
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262 | typedef struct jpeg_compress_struct * j_compress_ptr; |
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263 | typedef struct jpeg_decompress_struct * j_decompress_ptr; |
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264 | |||
265 | |||
266 | /* Master record for a compression instance */ |
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267 | |||
268 | struct jpeg_compress_struct { |
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269 | jpeg_common_fields; /* Fields shared with jpeg_decompress_struct */ |
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270 | |||
271 | /* Destination for compressed data */ |
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272 | struct jpeg_destination_mgr * dest; |
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273 | |||
274 | /* Description of source image --- these fields must be filled in by |
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275 | * outer application before starting compression. in_color_space must |
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276 | * be correct before you can even call jpeg_set_defaults(). |
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277 | */ |
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278 | |||
279 | JDIMENSION image_width; /* input image width */ |
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280 | JDIMENSION image_height; /* input image height */ |
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281 | int input_components; /* # of color components in input image */ |
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282 | J_COLOR_SPACE in_color_space; /* colorspace of input image */ |
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283 | |||
284 | double input_gamma; /* image gamma of input image */ |
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285 | |||
286 | /* Compression parameters --- these fields must be set before calling |
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287 | * jpeg_start_compress(). We recommend calling jpeg_set_defaults() to |
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288 | * initialize everything to reasonable defaults, then changing anything |
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289 | * the application specifically wants to change. That way you won't get |
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290 | * burnt when new parameters are added. Also note that there are several |
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291 | * helper routines to simplify changing parameters. |
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292 | */ |
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293 | |||
294 | int data_precision; /* bits of precision in image data */ |
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295 | |||
296 | int num_components; /* # of color components in JPEG image */ |
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297 | J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */ |
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298 | |||
299 | jpeg_component_info * comp_info; |
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300 | /* comp_info[i] describes component that appears i'th in SOF */ |
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301 | |||
302 | JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS]; |
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303 | /* ptrs to coefficient quantization tables, or NULL if not defined */ |
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304 | |||
305 | JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS]; |
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306 | JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS]; |
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307 | /* ptrs to Huffman coding tables, or NULL if not defined */ |
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308 | |||
309 | UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */ |
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310 | UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */ |
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311 | UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */ |
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312 | |||
313 | int num_scans; /* # of entries in scan_info array */ |
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314 | const jpeg_scan_info * scan_info; /* script for multi-scan file, or NULL */ |
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315 | /* The default value of scan_info is NULL, which causes a single-scan |
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316 | * sequential JPEG file to be emitted. To create a multi-scan file, |
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317 | * set num_scans and scan_info to point to an array of scan definitions. |
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318 | */ |
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319 | |||
320 | boolean raw_data_in; /* TRUE=caller supplies downsampled data */ |
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321 | boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */ |
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322 | boolean optimize_coding; /* TRUE=optimize entropy encoding parms */ |
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323 | boolean CCIR601_sampling; /* TRUE=first samples are cosited */ |
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324 | int smoothing_factor; /* 1..100, or 0 for no input smoothing */ |
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325 | J_DCT_METHOD dct_method; /* DCT algorithm selector */ |
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326 | |||
327 | /* The restart interval can be specified in absolute MCUs by setting |
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328 | * restart_interval, or in MCU rows by setting restart_in_rows |
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329 | * (in which case the correct restart_interval will be figured |
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330 | * for each scan). |
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331 | */ |
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332 | unsigned int restart_interval; /* MCUs per restart, or 0 for no restart */ |
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333 | int restart_in_rows; /* if > 0, MCU rows per restart interval */ |
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334 | |||
335 | /* Parameters controlling emission of special markers. */ |
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336 | |||
337 | boolean write_JFIF_header; /* should a JFIF marker be written? */ |
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338 | UINT8 JFIF_major_version; /* What to write for the JFIF version number */ |
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339 | UINT8 JFIF_minor_version; |
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340 | /* These three values are not used by the JPEG code, merely copied */ |
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341 | /* into the JFIF APP0 marker. density_unit can be 0 for unknown, */ |
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342 | /* 1 for dots/inch, or 2 for dots/cm. Note that the pixel aspect */ |
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343 | /* ratio is defined by X_density/Y_density even when density_unit=0. */ |
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344 | UINT8 density_unit; /* JFIF code for pixel size units */ |
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345 | UINT16 X_density; /* Horizontal pixel density */ |
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346 | UINT16 Y_density; /* Vertical pixel density */ |
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347 | boolean write_Adobe_marker; /* should an Adobe marker be written? */ |
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348 | |||
349 | /* State variable: index of next scanline to be written to |
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350 | * jpeg_write_scanlines(). Application may use this to control its |
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351 | * processing loop, e.g., "while (next_scanline < image_height)". |
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352 | */ |
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353 | |||
354 | JDIMENSION next_scanline; /* 0 .. image_height-1 */ |
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355 | |||
356 | /* Remaining fields are known throughout compressor, but generally |
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357 | * should not be touched by a surrounding application. |
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358 | */ |
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359 | |||
360 | /* |
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361 | * These fields are computed during compression startup |
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362 | */ |
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363 | boolean progressive_mode; /* TRUE if scan script uses progressive mode */ |
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364 | int max_h_samp_factor; /* largest h_samp_factor */ |
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365 | int max_v_samp_factor; /* largest v_samp_factor */ |
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366 | |||
367 | JDIMENSION total_iMCU_rows; /* # of iMCU rows to be input to coef ctlr */ |
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368 | /* The coefficient controller receives data in units of MCU rows as defined |
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369 | * for fully interleaved scans (whether the JPEG file is interleaved or not). |
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370 | * There are v_samp_factor * DCTSIZE sample rows of each component in an |
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371 | * "iMCU" (interleaved MCU) row. |
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372 | */ |
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373 | |||
374 | /* |
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375 | * These fields are valid during any one scan. |
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376 | * They describe the components and MCUs actually appearing in the scan. |
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377 | */ |
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378 | int comps_in_scan; /* # of JPEG components in this scan */ |
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379 | jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN]; |
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380 | /* *cur_comp_info[i] describes component that appears i'th in SOS */ |
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381 | |||
382 | JDIMENSION MCUs_per_row; /* # of MCUs across the image */ |
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383 | JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */ |
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384 | |||
385 | int blocks_in_MCU; /* # of DCT blocks per MCU */ |
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386 | int MCU_membership[C_MAX_BLOCKS_IN_MCU]; |
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387 | /* MCU_membership[i] is index in cur_comp_info of component owning */ |
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388 | /* i'th block in an MCU */ |
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389 | |||
390 | int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */ |
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391 | |||
392 | /* |
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393 | * Links to compression subobjects (methods and private variables of modules) |
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394 | */ |
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395 | struct jpeg_comp_master * master; |
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396 | struct jpeg_c_main_controller * main; |
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397 | struct jpeg_c_prep_controller * prep; |
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398 | struct jpeg_c_coef_controller * coef; |
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399 | struct jpeg_marker_writer * marker; |
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400 | struct jpeg_color_converter * cconvert; |
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401 | struct jpeg_downsampler * downsample; |
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402 | struct jpeg_forward_dct * fdct; |
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403 | struct jpeg_entropy_encoder * entropy; |
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404 | jpeg_scan_info * script_space; /* workspace for jpeg_simple_progression */ |
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405 | int script_space_size; |
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406 | }; |
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407 | |||
408 | |||
409 | /* Master record for a decompression instance */ |
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410 | |||
411 | struct jpeg_decompress_struct { |
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412 | jpeg_common_fields; /* Fields shared with jpeg_compress_struct */ |
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413 | |||
414 | /* Source of compressed data */ |
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415 | struct jpeg_source_mgr * src; |
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416 | |||
417 | /* Basic description of image --- filled in by jpeg_read_header(). */ |
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418 | /* Application may inspect these values to decide how to process image. */ |
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419 | |||
420 | JDIMENSION image_width; /* nominal image width (from SOF marker) */ |
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421 | JDIMENSION image_height; /* nominal image height */ |
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422 | int num_components; /* # of color components in JPEG image */ |
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423 | J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */ |
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424 | |||
425 | /* Decompression processing parameters --- these fields must be set before |
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426 | * calling jpeg_start_decompress(). Note that jpeg_read_header() initializes |
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427 | * them to default values. |
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428 | */ |
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429 | |||
430 | J_COLOR_SPACE out_color_space; /* colorspace for output */ |
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431 | |||
432 | unsigned int scale_num, scale_denom; /* fraction by which to scale image */ |
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433 | |||
434 | double output_gamma; /* image gamma wanted in output */ |
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435 | |||
436 | boolean buffered_image; /* TRUE=multiple output passes */ |
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437 | boolean raw_data_out; /* TRUE=downsampled data wanted */ |
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438 | |||
439 | J_DCT_METHOD dct_method; /* IDCT algorithm selector */ |
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440 | boolean do_fancy_upsampling; /* TRUE=apply fancy upsampling */ |
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441 | boolean do_block_smoothing; /* TRUE=apply interblock smoothing */ |
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442 | |||
443 | boolean quantize_colors; /* TRUE=colormapped output wanted */ |
||
444 | /* the following are ignored if not quantize_colors: */ |
||
445 | J_DITHER_MODE dither_mode; /* type of color dithering to use */ |
||
446 | boolean two_pass_quantize; /* TRUE=use two-pass color quantization */ |
||
447 | int desired_number_of_colors; /* max # colors to use in created colormap */ |
||
448 | /* these are significant only in buffered-image mode: */ |
||
449 | boolean enable_1pass_quant; /* enable future use of 1-pass quantizer */ |
||
450 | boolean enable_external_quant;/* enable future use of external colormap */ |
||
451 | boolean enable_2pass_quant; /* enable future use of 2-pass quantizer */ |
||
452 | |||
453 | /* Description of actual output image that will be returned to application. |
||
454 | * These fields are computed by jpeg_start_decompress(). |
||
455 | * You can also use jpeg_calc_output_dimensions() to determine these values |
||
456 | * in advance of calling jpeg_start_decompress(). |
||
457 | */ |
||
458 | |||
459 | JDIMENSION output_width; /* scaled image width */ |
||
460 | JDIMENSION output_height; /* scaled image height */ |
||
461 | int out_color_components; /* # of color components in out_color_space */ |
||
462 | int output_components; /* # of color components returned */ |
||
463 | /* output_components is 1 (a colormap index) when quantizing colors; |
||
464 | * otherwise it equals out_color_components. |
||
465 | */ |
||
466 | int rec_outbuf_height; /* min recommended height of scanline buffer */ |
||
467 | /* If the buffer passed to jpeg_read_scanlines() is less than this many rows |
||
468 | * high, space and time will be wasted due to unnecessary data copying. |
||
469 | * Usually rec_outbuf_height will be 1 or 2, at most 4. |
||
470 | */ |
||
471 | |||
472 | /* When quantizing colors, the output colormap is described by these fields. |
||
473 | * The application can supply a colormap by setting colormap non-NULL before |
||
474 | * calling jpeg_start_decompress; otherwise a colormap is created during |
||
475 | * jpeg_start_decompress or jpeg_start_output. |
||
476 | * The map has out_color_components rows and actual_number_of_colors columns. |
||
477 | */ |
||
478 | int actual_number_of_colors; /* number of entries in use */ |
||
479 | JSAMPARRAY colormap; /* The color map as a 2-D pixel array */ |
||
480 | |||
481 | /* State variables: these variables indicate the progress of decompression. |
||
482 | * The application may examine these but must not modify them. |
||
483 | */ |
||
484 | |||
485 | /* Row index of next scanline to be read from jpeg_read_scanlines(). |
||
486 | * Application may use this to control its processing loop, e.g., |
||
487 | * "while (output_scanline < output_height)". |
||
488 | */ |
||
489 | JDIMENSION output_scanline; /* 0 .. output_height-1 */ |
||
490 | |||
491 | /* Current input scan number and number of iMCU rows completed in scan. |
||
492 | * These indicate the progress of the decompressor input side. |
||
493 | */ |
||
494 | int input_scan_number; /* Number of SOS markers seen so far */ |
||
495 | JDIMENSION input_iMCU_row; /* Number of iMCU rows completed */ |
||
496 | |||
497 | /* The "output scan number" is the notional scan being displayed by the |
||
498 | * output side. The decompressor will not allow output scan/row number |
||
499 | * to get ahead of input scan/row, but it can fall arbitrarily far behind. |
||
500 | */ |
||
501 | int output_scan_number; /* Nominal scan number being displayed */ |
||
502 | JDIMENSION output_iMCU_row; /* Number of iMCU rows read */ |
||
503 | |||
504 | /* Current progression status. coef_bits[c][i] indicates the precision |
||
505 | * with which component c's DCT coefficient i (in zigzag order) is known. |
||
506 | * It is -1 when no data has yet been received, otherwise it is the point |
||
507 | * transform (shift) value for the most recent scan of the coefficient |
||
508 | * (thus, 0 at completion of the progression). |
||
509 | * This pointer is NULL when reading a non-progressive file. |
||
510 | */ |
||
511 | int (*coef_bits)[DCTSIZE2]; /* -1 or current Al value for each coef */ |
||
512 | |||
513 | /* Internal JPEG parameters --- the application usually need not look at |
||
514 | * these fields. Note that the decompressor output side may not use |
||
515 | * any parameters that can change between scans. |
||
516 | */ |
||
517 | |||
518 | /* Quantization and Huffman tables are carried forward across input |
||
519 | * datastreams when processing abbreviated JPEG datastreams. |
||
520 | */ |
||
521 | |||
522 | JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS]; |
||
523 | /* ptrs to coefficient quantization tables, or NULL if not defined */ |
||
524 | |||
525 | JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS]; |
||
526 | JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS]; |
||
527 | /* ptrs to Huffman coding tables, or NULL if not defined */ |
||
528 | |||
529 | /* These parameters are never carried across datastreams, since they |
||
530 | * are given in SOF/SOS markers or defined to be reset by SOI. |
||
531 | */ |
||
532 | |||
533 | int data_precision; /* bits of precision in image data */ |
||
534 | |||
535 | jpeg_component_info * comp_info; |
||
536 | /* comp_info[i] describes component that appears i'th in SOF */ |
||
537 | |||
538 | boolean progressive_mode; /* TRUE if SOFn specifies progressive mode */ |
||
539 | boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */ |
||
540 | |||
541 | UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */ |
||
542 | UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */ |
||
543 | UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */ |
||
544 | |||
545 | unsigned int restart_interval; /* MCUs per restart interval, or 0 for no restart */ |
||
546 | |||
547 | /* These fields record data obtained from optional markers recognized by |
||
548 | * the JPEG library. |
||
549 | */ |
||
550 | boolean saw_JFIF_marker; /* TRUE iff a JFIF APP0 marker was found */ |
||
551 | /* Data copied from JFIF marker; only valid if saw_JFIF_marker is TRUE: */ |
||
552 | UINT8 JFIF_major_version; /* JFIF version number */ |
||
553 | UINT8 JFIF_minor_version; |
||
554 | UINT8 density_unit; /* JFIF code for pixel size units */ |
||
555 | UINT16 X_density; /* Horizontal pixel density */ |
||
556 | UINT16 Y_density; /* Vertical pixel density */ |
||
557 | boolean saw_Adobe_marker; /* TRUE iff an Adobe APP14 marker was found */ |
||
558 | UINT8 Adobe_transform; /* Color transform code from Adobe marker */ |
||
559 | |||
560 | boolean CCIR601_sampling; /* TRUE=first samples are cosited */ |
||
561 | |||
562 | /* Aside from the specific data retained from APPn markers known to the |
||
563 | * library, the uninterpreted contents of any or all APPn and COM markers |
||
564 | * can be saved in a list for examination by the application. |
||
565 | */ |
||
566 | jpeg_saved_marker_ptr marker_list; /* Head of list of saved markers */ |
||
567 | |||
568 | /* Remaining fields are known throughout decompressor, but generally |
||
569 | * should not be touched by a surrounding application. |
||
570 | */ |
||
571 | |||
572 | /* |
||
573 | * These fields are computed during decompression startup |
||
574 | */ |
||
575 | int max_h_samp_factor; /* largest h_samp_factor */ |
||
576 | int max_v_samp_factor; /* largest v_samp_factor */ |
||
577 | |||
578 | int min_DCT_scaled_size; /* smallest DCT_scaled_size of any component */ |
||
579 | |||
580 | JDIMENSION total_iMCU_rows; /* # of iMCU rows in image */ |
||
581 | /* The coefficient controller's input and output progress is measured in |
||
582 | * units of "iMCU" (interleaved MCU) rows. These are the same as MCU rows |
||
583 | * in fully interleaved JPEG scans, but are used whether the scan is |
||
584 | * interleaved or not. We define an iMCU row as v_samp_factor DCT block |
||
585 | * rows of each component. Therefore, the IDCT output contains |
||
586 | * v_samp_factor*DCT_scaled_size sample rows of a component per iMCU row. |
||
587 | */ |
||
588 | |||
589 | JSAMPLE * sample_range_limit; /* table for fast range-limiting */ |
||
590 | |||
591 | /* |
||
592 | * These fields are valid during any one scan. |
||
593 | * They describe the components and MCUs actually appearing in the scan. |
||
594 | * Note that the decompressor output side must not use these fields. |
||
595 | */ |
||
596 | int comps_in_scan; /* # of JPEG components in this scan */ |
||
597 | jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN]; |
||
598 | /* *cur_comp_info[i] describes component that appears i'th in SOS */ |
||
599 | |||
600 | JDIMENSION MCUs_per_row; /* # of MCUs across the image */ |
||
601 | JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */ |
||
602 | |||
603 | int blocks_in_MCU; /* # of DCT blocks per MCU */ |
||
604 | int MCU_membership[D_MAX_BLOCKS_IN_MCU]; |
||
605 | /* MCU_membership[i] is index in cur_comp_info of component owning */ |
||
606 | /* i'th block in an MCU */ |
||
607 | |||
608 | int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */ |
||
609 | |||
610 | /* This field is shared between entropy decoder and marker parser. |
||
611 | * It is either zero or the code of a JPEG marker that has been |
||
612 | * read from the data source, but has not yet been processed. |
||
613 | */ |
||
614 | int unread_marker; |
||
615 | |||
616 | /* |
||
617 | * Links to decompression subobjects (methods, private variables of modules) |
||
618 | */ |
||
619 | struct jpeg_decomp_master * master; |
||
620 | struct jpeg_d_main_controller * main; |
||
621 | struct jpeg_d_coef_controller * coef; |
||
622 | struct jpeg_d_post_controller * post; |
||
623 | struct jpeg_input_controller * inputctl; |
||
624 | struct jpeg_marker_reader * marker; |
||
625 | struct jpeg_entropy_decoder * entropy; |
||
626 | struct jpeg_inverse_dct * idct; |
||
627 | struct jpeg_upsampler * upsample; |
||
628 | struct jpeg_color_deconverter * cconvert; |
||
629 | struct jpeg_color_quantizer * cquantize; |
||
630 | }; |
||
631 | |||
632 | |||
633 | /* "Object" declarations for JPEG modules that may be supplied or called |
||
634 | * directly by the surrounding application. |
||
635 | * As with all objects in the JPEG library, these structs only define the |
||
636 | * publicly visible methods and state variables of a module. Additional |
||
637 | * private fields may exist after the public ones. |
||
638 | */ |
||
639 | |||
640 | |||
641 | /* Error handler object */ |
||
642 | |||
643 | struct jpeg_error_mgr { |
||
644 | /* Error exit handler: does not return to caller */ |
||
645 | JMETHOD(void, error_exit, (j_common_ptr cinfo)); |
||
646 | /* Conditionally emit a trace or warning message */ |
||
647 | JMETHOD(void, emit_message, (j_common_ptr cinfo, int msg_level)); |
||
648 | /* Routine that actually outputs a trace or error message */ |
||
649 | JMETHOD(void, output_message, (j_common_ptr cinfo)); |
||
650 | /* Format a message string for the most recent JPEG error or message */ |
||
651 | JMETHOD(void, format_message, (j_common_ptr cinfo, char * buffer)); |
||
652 | #define JMSG_LENGTH_MAX 200 /* recommended size of format_message buffer */ |
||
653 | /* Reset error state variables at start of a new image */ |
||
654 | JMETHOD(void, reset_error_mgr, (j_common_ptr cinfo)); |
||
655 | |||
656 | /* The message ID code and any parameters are saved here. |
||
657 | * A message can have one string parameter or up to 8 int parameters. |
||
658 | */ |
||
659 | int msg_code; |
||
660 | #define JMSG_STR_PARM_MAX 80 |
||
661 | union { |
||
662 | int i[8]; |
||
663 | char s[JMSG_STR_PARM_MAX]; |
||
664 | } msg_parm; |
||
665 | |||
666 | /* Standard state variables for error facility */ |
||
667 | |||
668 | int trace_level; /* max msg_level that will be displayed */ |
||
669 | |||
670 | /* For recoverable corrupt-data errors, we emit a warning message, |
||
671 | * but keep going unless emit_message chooses to abort. emit_message |
||
672 | * should count warnings in num_warnings. The surrounding application |
||
673 | * can check for bad data by seeing if num_warnings is nonzero at the |
||
674 | * end of processing. |
||
675 | */ |
||
676 | long num_warnings; /* number of corrupt-data warnings */ |
||
677 | |||
678 | /* These fields point to the table(s) of error message strings. |
||
679 | * An application can change the table pointer to switch to a different |
||
680 | * message list (typically, to change the language in which errors are |
||
681 | * reported). Some applications may wish to add additional error codes |
||
682 | * that will be handled by the JPEG library error mechanism; the second |
||
683 | * table pointer is used for this purpose. |
||
684 | * |
||
685 | * First table includes all errors generated by JPEG library itself. |
||
686 | * Error code 0 is reserved for a "no such error string" message. |
||
687 | */ |
||
688 | const char * const * jpeg_message_table; /* Library errors */ |
||
689 | int last_jpeg_message; /* Table contains strings 0..last_jpeg_message */ |
||
690 | /* Second table can be added by application (see cjpeg/djpeg for example). |
||
691 | * It contains strings numbered first_addon_message..last_addon_message. |
||
692 | */ |
||
693 | const char * const * addon_message_table; /* Non-library errors */ |
||
694 | int first_addon_message; /* code for first string in addon table */ |
||
695 | int last_addon_message; /* code for last string in addon table */ |
||
696 | }; |
||
697 | |||
698 | |||
699 | /* Progress monitor object */ |
||
700 | |||
701 | struct jpeg_progress_mgr { |
||
702 | JMETHOD(void, progress_monitor, (j_common_ptr cinfo)); |
||
703 | |||
704 | long pass_counter; /* work units completed in this pass */ |
||
705 | long pass_limit; /* total number of work units in this pass */ |
||
706 | int completed_passes; /* passes completed so far */ |
||
707 | int total_passes; /* total number of passes expected */ |
||
708 | }; |
||
709 | |||
710 | |||
711 | /* Data destination object for compression */ |
||
712 | |||
713 | struct jpeg_destination_mgr { |
||
714 | JOCTET * next_output_byte; /* => next byte to write in buffer */ |
||
715 | size_t free_in_buffer; /* # of byte spaces remaining in buffer */ |
||
716 | |||
717 | JMETHOD(void, init_destination, (j_compress_ptr cinfo)); |
||
718 | JMETHOD(boolean, empty_output_buffer, (j_compress_ptr cinfo)); |
||
719 | JMETHOD(void, term_destination, (j_compress_ptr cinfo)); |
||
720 | }; |
||
721 | |||
722 | |||
723 | /* Data source object for decompression */ |
||
724 | |||
725 | struct jpeg_source_mgr { |
||
726 | const JOCTET * next_input_byte; /* => next byte to read from buffer */ |
||
727 | size_t bytes_in_buffer; /* # of bytes remaining in buffer */ |
||
728 | |||
729 | JMETHOD(void, init_source, (j_decompress_ptr cinfo)); |
||
730 | JMETHOD(boolean, fill_input_buffer, (j_decompress_ptr cinfo)); |
||
731 | JMETHOD(void, skip_input_data, (j_decompress_ptr cinfo, long num_bytes)); |
||
732 | JMETHOD(boolean, resync_to_restart, (j_decompress_ptr cinfo, int desired)); |
||
733 | JMETHOD(void, term_source, (j_decompress_ptr cinfo)); |
||
734 | }; |
||
735 | |||
736 | |||
737 | /* Memory manager object. |
||
738 | * Allocates "small" objects (a few K total), "large" objects (tens of K), |
||
739 | * and "really big" objects (virtual arrays with backing store if needed). |
||
740 | * The memory manager does not allow individual objects to be freed; rather, |
||
741 | * each created object is assigned to a pool, and whole pools can be freed |
||
742 | * at once. This is faster and more convenient than remembering exactly what |
||
743 | * to free, especially where malloc()/free() are not too speedy. |
||
744 | * NB: alloc routines never return NULL. They exit to error_exit if not |
||
745 | * successful. |
||
746 | */ |
||
747 | |||
748 | #define JPOOL_PERMANENT 0 /* lasts until master record is destroyed */ |
||
749 | #define JPOOL_IMAGE 1 /* lasts until done with image/datastream */ |
||
750 | #define JPOOL_NUMPOOLS 2 |
||
751 | |||
752 | typedef struct jvirt_sarray_control * jvirt_sarray_ptr; |
||
753 | typedef struct jvirt_barray_control * jvirt_barray_ptr; |
||
754 | |||
755 | |||
756 | struct jpeg_memory_mgr { |
||
757 | /* Method pointers */ |
||
758 | JMETHOD(void *, alloc_small, (j_common_ptr cinfo, int pool_id, |
||
759 | size_t sizeofobject)); |
||
760 | JMETHOD(void FAR *, alloc_large, (j_common_ptr cinfo, int pool_id, |
||
761 | size_t sizeofobject)); |
||
762 | JMETHOD(JSAMPARRAY, alloc_sarray, (j_common_ptr cinfo, int pool_id, |
||
763 | JDIMENSION samplesperrow, |
||
764 | JDIMENSION numrows)); |
||
765 | JMETHOD(JBLOCKARRAY, alloc_barray, (j_common_ptr cinfo, int pool_id, |
||
766 | JDIMENSION blocksperrow, |
||
767 | JDIMENSION numrows)); |
||
768 | JMETHOD(jvirt_sarray_ptr, request_virt_sarray, (j_common_ptr cinfo, |
||
769 | int pool_id, |
||
770 | boolean pre_zero, |
||
771 | JDIMENSION samplesperrow, |
||
772 | JDIMENSION numrows, |
||
773 | JDIMENSION maxaccess)); |
||
774 | JMETHOD(jvirt_barray_ptr, request_virt_barray, (j_common_ptr cinfo, |
||
775 | int pool_id, |
||
776 | boolean pre_zero, |
||
777 | JDIMENSION blocksperrow, |
||
778 | JDIMENSION numrows, |
||
779 | JDIMENSION maxaccess)); |
||
780 | JMETHOD(void, realize_virt_arrays, (j_common_ptr cinfo)); |
||
781 | JMETHOD(JSAMPARRAY, access_virt_sarray, (j_common_ptr cinfo, |
||
782 | jvirt_sarray_ptr ptr, |
||
783 | JDIMENSION start_row, |
||
784 | JDIMENSION num_rows, |
||
785 | boolean writable)); |
||
786 | JMETHOD(JBLOCKARRAY, access_virt_barray, (j_common_ptr cinfo, |
||
787 | jvirt_barray_ptr ptr, |
||
788 | JDIMENSION start_row, |
||
789 | JDIMENSION num_rows, |
||
790 | boolean writable)); |
||
791 | JMETHOD(void, free_pool, (j_common_ptr cinfo, int pool_id)); |
||
792 | JMETHOD(void, self_destruct, (j_common_ptr cinfo)); |
||
793 | |||
794 | /* Limit on memory allocation for this JPEG object. (Note that this is |
||
795 | * merely advisory, not a guaranteed maximum; it only affects the space |
||
796 | * used for virtual-array buffers.) May be changed by outer application |
||
797 | * after creating the JPEG object. |
||
798 | */ |
||
799 | long max_memory_to_use; |
||
800 | |||
801 | /* Maximum allocation request accepted by alloc_large. */ |
||
802 | long max_alloc_chunk; |
||
803 | }; |
||
804 | |||
805 | |||
806 | /* Routine signature for application-supplied marker processing methods. |
||
807 | * Need not pass marker code since it is stored in cinfo->unread_marker. |
||
808 | */ |
||
809 | typedef JMETHOD(boolean, jpeg_marker_parser_method, (j_decompress_ptr cinfo)); |
||
810 | |||
811 | |||
812 | /* Declarations for routines called by application. |
||
813 | * The JPP macro hides prototype parameters from compilers that can't cope. |
||
814 | * Note JPP requires double parentheses. |
||
815 | */ |
||
816 | |||
817 | #ifdef HAVE_PROTOTYPES |
||
818 | #define JPP(arglist) arglist |
||
819 | #else |
||
820 | #define JPP(arglist) () |
||
821 | #endif |
||
822 | |||
823 | |||
824 | /* Short forms of external names for systems with brain-damaged linkers. |
||
825 | * We shorten external names to be unique in the first six letters, which |
||
826 | * is good enough for all known systems. |
||
827 | * (If your compiler itself needs names to be unique in less than 15 |
||
828 | * characters, you are out of luck. Get a better compiler.) |
||
829 | */ |
||
830 | |||
831 | #ifdef NEED_SHORT_EXTERNAL_NAMES |
||
832 | #define jpeg_std_error jStdError |
||
833 | #define jpeg_CreateCompress jCreaCompress |
||
834 | #define jpeg_CreateDecompress jCreaDecompress |
||
835 | #define jpeg_destroy_compress jDestCompress |
||
836 | #define jpeg_destroy_decompress jDestDecompress |
||
837 | #define jpeg_stdio_dest jStdDest |
||
838 | #define jpeg_stdio_src jStdSrc |
||
839 | #define jpeg_set_defaults jSetDefaults |
||
840 | #define jpeg_set_colorspace jSetColorspace |
||
841 | #define jpeg_default_colorspace jDefColorspace |
||
842 | #define jpeg_set_quality jSetQuality |
||
843 | #define jpeg_set_linear_quality jSetLQuality |
||
844 | #define jpeg_add_quant_table jAddQuantTable |
||
845 | #define jpeg_quality_scaling jQualityScaling |
||
846 | #define jpeg_simple_progression jSimProgress |
||
847 | #define jpeg_suppress_tables jSuppressTables |
||
848 | #define jpeg_alloc_quant_table jAlcQTable |
||
849 | #define jpeg_alloc_huff_table jAlcHTable |
||
850 | #define jpeg_start_compress jStrtCompress |
||
851 | #define jpeg_write_scanlines jWrtScanlines |
||
852 | #define jpeg_finish_compress jFinCompress |
||
853 | #define jpeg_write_raw_data jWrtRawData |
||
854 | #define jpeg_write_marker jWrtMarker |
||
855 | #define jpeg_write_m_header jWrtMHeader |
||
856 | #define jpeg_write_m_byte jWrtMByte |
||
857 | #define jpeg_write_tables jWrtTables |
||
858 | #define jpeg_read_header jReadHeader |
||
859 | #define jpeg_start_decompress jStrtDecompress |
||
860 | #define jpeg_read_scanlines jReadScanlines |
||
861 | #define jpeg_finish_decompress jFinDecompress |
||
862 | #define jpeg_read_raw_data jReadRawData |
||
863 | #define jpeg_has_multiple_scans jHasMultScn |
||
864 | #define jpeg_start_output jStrtOutput |
||
865 | #define jpeg_finish_output jFinOutput |
||
866 | #define jpeg_input_complete jInComplete |
||
867 | #define jpeg_new_colormap jNewCMap |
||
868 | #define jpeg_consume_input jConsumeInput |
||
869 | #define jpeg_calc_output_dimensions jCalcDimensions |
||
870 | #define jpeg_save_markers jSaveMarkers |
||
871 | #define jpeg_set_marker_processor jSetMarker |
||
872 | #define jpeg_read_coefficients jReadCoefs |
||
873 | #define jpeg_write_coefficients jWrtCoefs |
||
874 | #define jpeg_copy_critical_parameters jCopyCrit |
||
875 | #define jpeg_abort_compress jAbrtCompress |
||
876 | #define jpeg_abort_decompress jAbrtDecompress |
||
877 | #define jpeg_abort jAbort |
||
878 | #define jpeg_destroy jDestroy |
||
879 | #define jpeg_resync_to_restart jResyncRestart |
||
880 | #endif /* NEED_SHORT_EXTERNAL_NAMES */ |
||
881 | |||
882 | |||
883 | /* Default error-management setup */ |
||
884 | EXTERN(struct jpeg_error_mgr *) jpeg_std_error |
||
885 | JPP((struct jpeg_error_mgr * err)); |
||
886 | |||
887 | /* Initialization of JPEG compression objects. |
||
888 | * jpeg_create_compress() and jpeg_create_decompress() are the exported |
||
889 | * names that applications should call. These expand to calls on |
||
890 | * jpeg_CreateCompress and jpeg_CreateDecompress with additional information |
||
891 | * passed for version mismatch checking. |
||
892 | * NB: you must set up the error-manager BEFORE calling jpeg_create_xxx. |
||
893 | */ |
||
894 | #define jpeg_create_compress(cinfo) \ |
||
895 | jpeg_CreateCompress((cinfo), JPEG_LIB_VERSION, \ |
||
896 | (size_t) sizeof(struct jpeg_compress_struct)) |
||
897 | #define jpeg_create_decompress(cinfo) \ |
||
898 | jpeg_CreateDecompress((cinfo), JPEG_LIB_VERSION, \ |
||
899 | (size_t) sizeof(struct jpeg_decompress_struct)) |
||
900 | EXTERN(void) jpeg_CreateCompress JPP((j_compress_ptr cinfo, |
||
901 | int version, size_t structsize)); |
||
902 | EXTERN(void) jpeg_CreateDecompress JPP((j_decompress_ptr cinfo, |
||
903 | int version, size_t structsize)); |
||
904 | /* Destruction of JPEG compression objects */ |
||
905 | EXTERN(void) jpeg_destroy_compress JPP((j_compress_ptr cinfo)); |
||
906 | EXTERN(void) jpeg_destroy_decompress JPP((j_decompress_ptr cinfo)); |
||
907 | |||
908 | /* Standard data source and destination managers: stdio streams. */ |
||
909 | /* Caller is responsible for opening the file before and closing after. */ |
||
910 | EXTERN(void) jpeg_stdio_dest JPP((j_compress_ptr cinfo, FILE * outfile)); |
||
911 | EXTERN(void) jpeg_stdio_src JPP((j_decompress_ptr cinfo, FILE * infile)); |
||
912 | |||
913 | /* Default parameter setup for compression */ |
||
914 | EXTERN(void) jpeg_set_defaults JPP((j_compress_ptr cinfo)); |
||
915 | /* Compression parameter setup aids */ |
||
916 | EXTERN(void) jpeg_set_colorspace JPP((j_compress_ptr cinfo, |
||
917 | J_COLOR_SPACE colorspace)); |
||
918 | EXTERN(void) jpeg_default_colorspace JPP((j_compress_ptr cinfo)); |
||
919 | EXTERN(void) jpeg_set_quality JPP((j_compress_ptr cinfo, int quality, |
||
920 | boolean force_baseline)); |
||
921 | EXTERN(void) jpeg_set_linear_quality JPP((j_compress_ptr cinfo, |
||
922 | int scale_factor, |
||
923 | boolean force_baseline)); |
||
924 | EXTERN(void) jpeg_add_quant_table JPP((j_compress_ptr cinfo, int which_tbl, |
||
925 | const unsigned int *basic_table, |
||
926 | int scale_factor, |
||
927 | boolean force_baseline)); |
||
928 | EXTERN(int) jpeg_quality_scaling JPP((int quality)); |
||
929 | EXTERN(void) jpeg_simple_progression JPP((j_compress_ptr cinfo)); |
||
930 | EXTERN(void) jpeg_suppress_tables JPP((j_compress_ptr cinfo, |
||
931 | boolean suppress)); |
||
932 | EXTERN(JQUANT_TBL *) jpeg_alloc_quant_table JPP((j_common_ptr cinfo)); |
||
933 | EXTERN(JHUFF_TBL *) jpeg_alloc_huff_table JPP((j_common_ptr cinfo)); |
||
934 | |||
935 | /* Main entry points for compression */ |
||
936 | EXTERN(void) jpeg_start_compress JPP((j_compress_ptr cinfo, |
||
937 | boolean write_all_tables)); |
||
938 | EXTERN(JDIMENSION) jpeg_write_scanlines JPP((j_compress_ptr cinfo, |
||
939 | JSAMPARRAY scanlines, |
||
940 | JDIMENSION num_lines)); |
||
941 | EXTERN(void) jpeg_finish_compress JPP((j_compress_ptr cinfo)); |
||
942 | |||
943 | /* Replaces jpeg_write_scanlines when writing raw downsampled data. */ |
||
944 | EXTERN(JDIMENSION) jpeg_write_raw_data JPP((j_compress_ptr cinfo, |
||
945 | JSAMPIMAGE data, |
||
946 | JDIMENSION num_lines)); |
||
947 | |||
948 | /* Write a special marker. See libjpeg.doc concerning safe usage. */ |
||
949 | EXTERN(void) jpeg_write_marker |
||
950 | JPP((j_compress_ptr cinfo, int marker, |
||
951 | const JOCTET * dataptr, unsigned int datalen)); |
||
952 | /* Same, but piecemeal. */ |
||
953 | EXTERN(void) jpeg_write_m_header |
||
954 | JPP((j_compress_ptr cinfo, int marker, unsigned int datalen)); |
||
955 | EXTERN(void) jpeg_write_m_byte |
||
956 | JPP((j_compress_ptr cinfo, int val)); |
||
957 | |||
958 | /* Alternate compression function: just write an abbreviated table file */ |
||
959 | EXTERN(void) jpeg_write_tables JPP((j_compress_ptr cinfo)); |
||
960 | |||
961 | /* Decompression startup: read start of JPEG datastream to see what's there */ |
||
962 | EXTERN(int) jpeg_read_header JPP((j_decompress_ptr cinfo, |
||
963 | boolean require_image)); |
||
964 | /* Return value is one of: */ |
||
965 | #define JPEG_SUSPENDED 0 /* Suspended due to lack of input data */ |
||
966 | #define JPEG_HEADER_OK 1 /* Found valid image datastream */ |
||
967 | #define JPEG_HEADER_TABLES_ONLY 2 /* Found valid table-specs-only datastream */ |
||
968 | /* If you pass require_image = TRUE (normal case), you need not check for |
||
969 | * a TABLES_ONLY return code; an abbreviated file will cause an error exit. |
||
970 | * JPEG_SUSPENDED is only possible if you use a data source module that can |
||
971 | * give a suspension return (the stdio source module doesn't). |
||
972 | */ |
||
973 | |||
974 | /* Main entry points for decompression */ |
||
975 | EXTERN(boolean) jpeg_start_decompress JPP((j_decompress_ptr cinfo)); |
||
976 | EXTERN(JDIMENSION) jpeg_read_scanlines JPP((j_decompress_ptr cinfo, |
||
977 | JSAMPARRAY scanlines, |
||
978 | JDIMENSION max_lines)); |
||
979 | EXTERN(boolean) jpeg_finish_decompress JPP((j_decompress_ptr cinfo)); |
||
980 | |||
981 | /* Replaces jpeg_read_scanlines when reading raw downsampled data. */ |
||
982 | EXTERN(JDIMENSION) jpeg_read_raw_data JPP((j_decompress_ptr cinfo, |
||
983 | JSAMPIMAGE data, |
||
984 | JDIMENSION max_lines)); |
||
985 | |||
986 | /* Additional entry points for buffered-image mode. */ |
||
987 | EXTERN(boolean) jpeg_has_multiple_scans JPP((j_decompress_ptr cinfo)); |
||
988 | EXTERN(boolean) jpeg_start_output JPP((j_decompress_ptr cinfo, |
||
989 | int scan_number)); |
||
990 | EXTERN(boolean) jpeg_finish_output JPP((j_decompress_ptr cinfo)); |
||
991 | EXTERN(boolean) jpeg_input_complete JPP((j_decompress_ptr cinfo)); |
||
992 | EXTERN(void) jpeg_new_colormap JPP((j_decompress_ptr cinfo)); |
||
993 | EXTERN(int) jpeg_consume_input JPP((j_decompress_ptr cinfo)); |
||
994 | /* Return value is one of: */ |
||
995 | /* #define JPEG_SUSPENDED 0 Suspended due to lack of input data */ |
||
996 | #define JPEG_REACHED_SOS 1 /* Reached start of new scan */ |
||
997 | #define JPEG_REACHED_EOI 2 /* Reached end of image */ |
||
998 | #define JPEG_ROW_COMPLETED 3 /* Completed one iMCU row */ |
||
999 | #define JPEG_SCAN_COMPLETED 4 /* Completed last iMCU row of a scan */ |
||
1000 | |||
1001 | /* Precalculate output dimensions for current decompression parameters. */ |
||
1002 | EXTERN(void) jpeg_calc_output_dimensions JPP((j_decompress_ptr cinfo)); |
||
1003 | |||
1004 | /* Control saving of COM and APPn markers into marker_list. */ |
||
1005 | EXTERN(void) jpeg_save_markers |
||
1006 | JPP((j_decompress_ptr cinfo, int marker_code, |
||
1007 | unsigned int length_limit)); |
||
1008 | |||
1009 | /* Install a special processing method for COM or APPn markers. */ |
||
1010 | EXTERN(void) jpeg_set_marker_processor |
||
1011 | JPP((j_decompress_ptr cinfo, int marker_code, |
||
1012 | jpeg_marker_parser_method routine)); |
||
1013 | |||
1014 | /* Read or write raw DCT coefficients --- useful for lossless transcoding. */ |
||
1015 | EXTERN(jvirt_barray_ptr *) jpeg_read_coefficients JPP((j_decompress_ptr cinfo)); |
||
1016 | EXTERN(void) jpeg_write_coefficients JPP((j_compress_ptr cinfo, |
||
1017 | jvirt_barray_ptr * coef_arrays)); |
||
1018 | EXTERN(void) jpeg_copy_critical_parameters JPP((j_decompress_ptr srcinfo, |
||
1019 | j_compress_ptr dstinfo)); |
||
1020 | |||
1021 | /* If you choose to abort compression or decompression before completing |
||
1022 | * jpeg_finish_(de)compress, then you need to clean up to release memory, |
||
1023 | * temporary files, etc. You can just call jpeg_destroy_(de)compress |
||
1024 | * if you're done with the JPEG object, but if you want to clean it up and |
||
1025 | * reuse it, call this: |
||
1026 | */ |
||
1027 | EXTERN(void) jpeg_abort_compress JPP((j_compress_ptr cinfo)); |
||
1028 | EXTERN(void) jpeg_abort_decompress JPP((j_decompress_ptr cinfo)); |
||
1029 | |||
1030 | /* Generic versions of jpeg_abort and jpeg_destroy that work on either |
||
1031 | * flavor of JPEG object. These may be more convenient in some places. |
||
1032 | */ |
||
1033 | EXTERN(void) jpeg_abort JPP((j_common_ptr cinfo)); |
||
1034 | EXTERN(void) jpeg_destroy JPP((j_common_ptr cinfo)); |
||
1035 | |||
1036 | /* Default restart-marker-resync procedure for use by data source modules */ |
||
1037 | EXTERN(boolean) jpeg_resync_to_restart JPP((j_decompress_ptr cinfo, |
||
1038 | int desired)); |
||
1039 | |||
1040 | |||
1041 | /* These marker codes are exported since applications and data source modules |
||
1042 | * are likely to want to use them. |
||
1043 | */ |
||
1044 | |||
1045 | #define JPEG_RST0 0xD0 /* RST0 marker code */ |
||
1046 | #define JPEG_EOI 0xD9 /* EOI marker code */ |
||
1047 | #define JPEG_APP0 0xE0 /* APP0 marker code */ |
||
1048 | #define JPEG_COM 0xFE /* COM marker code */ |
||
1049 | |||
1050 | |||
1051 | /* If we have a brain-damaged compiler that emits warnings (or worse, errors) |
||
1052 | * for structure definitions that are never filled in, keep it quiet by |
||
1053 | * supplying dummy definitions for the various substructures. |
||
1054 | */ |
||
1055 | |||
1056 | #ifdef INCOMPLETE_TYPES_BROKEN |
||
1057 | #ifndef JPEG_INTERNALS /* will be defined in jpegint.h */ |
||
1058 | struct jvirt_sarray_control { long dummy; }; |
||
1059 | struct jvirt_barray_control { long dummy; }; |
||
1060 | struct jpeg_comp_master { long dummy; }; |
||
1061 | struct jpeg_c_main_controller { long dummy; }; |
||
1062 | struct jpeg_c_prep_controller { long dummy; }; |
||
1063 | struct jpeg_c_coef_controller { long dummy; }; |
||
1064 | struct jpeg_marker_writer { long dummy; }; |
||
1065 | struct jpeg_color_converter { long dummy; }; |
||
1066 | struct jpeg_downsampler { long dummy; }; |
||
1067 | struct jpeg_forward_dct { long dummy; }; |
||
1068 | struct jpeg_entropy_encoder { long dummy; }; |
||
1069 | struct jpeg_decomp_master { long dummy; }; |
||
1070 | struct jpeg_d_main_controller { long dummy; }; |
||
1071 | struct jpeg_d_coef_controller { long dummy; }; |
||
1072 | struct jpeg_d_post_controller { long dummy; }; |
||
1073 | struct jpeg_input_controller { long dummy; }; |
||
1074 | struct jpeg_marker_reader { long dummy; }; |
||
1075 | struct jpeg_entropy_decoder { long dummy; }; |
||
1076 | struct jpeg_inverse_dct { long dummy; }; |
||
1077 | struct jpeg_upsampler { long dummy; }; |
||
1078 | struct jpeg_color_deconverter { long dummy; }; |
||
1079 | struct jpeg_color_quantizer { long dummy; }; |
||
1080 | #endif /* JPEG_INTERNALS */ |
||
1081 | #endif /* INCOMPLETE_TYPES_BROKEN */ |
||
1082 | |||
1083 | |||
1084 | /* |
||
1085 | * The JPEG library modules define JPEG_INTERNALS before including this file. |
||
1086 | * The internal structure declarations are read only when that is true. |
||
1087 | * Applications using the library should not include jpegint.h, but may wish |
||
1088 | * to include jerror.h. |
||
1089 | */ |
||
1090 | |||
1091 | #ifdef JPEG_INTERNALS |
||
1092 | #include "jpegint.h" /* fetch private declarations */ |
||
1093 | #include "jerror.h" /* fetch error codes too */ |
||
1094 | #endif |
||
1095 | |||
1096 | #endif /* JPEGLIB_H */>> |