Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 1 | /* |
| 2 | * jpeglib.h |
| 3 | * |
DRC | a73e870 | 2012-12-31 02:52:30 +0000 | [diff] [blame] | 4 | * This file was part of the Independent JPEG Group's software: |
Thomas G. Lane | 5ead57a | 1998-03-27 00:00:00 +0000 | [diff] [blame] | 5 | * Copyright (C) 1991-1998, Thomas G. Lane. |
Guido Vollbeding | 5996a25 | 2009-06-27 00:00:00 +0000 | [diff] [blame] | 6 | * Modified 2002-2009 by Guido Vollbeding. |
DRC | da13af6 | 2014-05-18 17:52:06 +0000 | [diff] [blame] | 7 | * libjpeg-turbo Modifications: |
DRC | 78df2e6 | 2014-05-12 09:23:57 +0000 | [diff] [blame] | 8 | * Copyright (C) 2009-2011, 2013-2014, D. R. Commander. |
DRC | eb32cc1 | 2015-06-25 03:44:36 +0000 | [diff] [blame] | 9 | * Copyright (C) 2015, Google, Inc. |
DRC | 7e3acc0 | 2015-10-10 10:25:46 -0500 | [diff] [blame] | 10 | * For conditions of distribution and use, see the accompanying README.ijg |
| 11 | * file. |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 12 | * |
| 13 | * This file defines the application interface for the JPEG library. |
| 14 | * Most applications using the library need only include this file, |
| 15 | * and perhaps jerror.h if they want to know the exact error codes. |
| 16 | */ |
| 17 | |
Thomas G. Lane | 9ba2f5e | 1994-12-07 00:00:00 +0000 | [diff] [blame] | 18 | #ifndef JPEGLIB_H |
| 19 | #define JPEGLIB_H |
| 20 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 21 | /* |
| 22 | * First we include the configuration files that record how this |
| 23 | * installation of the JPEG library is set up. jconfig.h can be |
| 24 | * generated automatically for many systems. jmorecfg.h contains |
| 25 | * manual configuration options that most people need not worry about. |
| 26 | */ |
| 27 | |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 28 | #ifndef JCONFIG_INCLUDED /* in case jinclude.h already did */ |
| 29 | #include "jconfig.h" /* widely used configuration options */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 30 | #endif |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 31 | #include "jmorecfg.h" /* seldom changed options */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 32 | |
| 33 | |
Guido Vollbeding | 5996a25 | 2009-06-27 00:00:00 +0000 | [diff] [blame] | 34 | #ifdef __cplusplus |
| 35 | #ifndef DONT_USE_EXTERN_C |
| 36 | extern "C" { |
| 37 | #endif |
| 38 | #endif |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 39 | |
| 40 | |
| 41 | /* Various constants determining the sizes of things. |
| 42 | * All of these are specified by the JPEG standard, so don't change them |
| 43 | * if you want to be compatible. |
| 44 | */ |
| 45 | |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 46 | #define DCTSIZE 8 /* The basic DCT block is 8x8 samples */ |
| 47 | #define DCTSIZE2 64 /* DCTSIZE squared; # of elements in a block */ |
| 48 | #define NUM_QUANT_TBLS 4 /* Quantization tables are numbered 0..3 */ |
| 49 | #define NUM_HUFF_TBLS 4 /* Huffman tables are numbered 0..3 */ |
| 50 | #define NUM_ARITH_TBLS 16 /* Arith-coding tables are numbered 0..15 */ |
| 51 | #define MAX_COMPS_IN_SCAN 4 /* JPEG limit on # of components in one scan */ |
| 52 | #define MAX_SAMP_FACTOR 4 /* JPEG limit on sampling factors */ |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 53 | /* Unfortunately, some bozo at Adobe saw no reason to be bound by the standard; |
| 54 | * the PostScript DCT filter can emit files with many more than 10 blocks/MCU. |
| 55 | * If you happen to run across such a file, you can up D_MAX_BLOCKS_IN_MCU |
| 56 | * to handle it. We even let you do this from the jconfig.h file. However, |
| 57 | * we strongly discourage changing C_MAX_BLOCKS_IN_MCU; just because Adobe |
| 58 | * sometimes emits noncompliant files doesn't mean you should too. |
| 59 | */ |
| 60 | #define C_MAX_BLOCKS_IN_MCU 10 /* compressor's limit on blocks per MCU */ |
| 61 | #ifndef D_MAX_BLOCKS_IN_MCU |
| 62 | #define D_MAX_BLOCKS_IN_MCU 10 /* decompressor's limit on blocks per MCU */ |
| 63 | #endif |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 64 | |
| 65 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 66 | /* Data structures for images (arrays of samples and of DCT coefficients). |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 67 | */ |
| 68 | |
DRC | 5033f3e | 2014-05-18 18:33:44 +0000 | [diff] [blame] | 69 | typedef JSAMPLE *JSAMPROW; /* ptr to one image row of pixel samples. */ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 70 | typedef JSAMPROW *JSAMPARRAY; /* ptr to some rows (a 2-D sample array) */ |
| 71 | typedef JSAMPARRAY *JSAMPIMAGE; /* a 3-D sample array: top index is color */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 72 | |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 73 | typedef JCOEF JBLOCK[DCTSIZE2]; /* one block of coefficients */ |
DRC | 5033f3e | 2014-05-18 18:33:44 +0000 | [diff] [blame] | 74 | typedef JBLOCK *JBLOCKROW; /* pointer to one row of coefficient blocks */ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 75 | typedef JBLOCKROW *JBLOCKARRAY; /* a 2-D array of coefficient blocks */ |
| 76 | typedef JBLOCKARRAY *JBLOCKIMAGE; /* a 3-D array of coefficient blocks */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 77 | |
DRC | 5033f3e | 2014-05-18 18:33:44 +0000 | [diff] [blame] | 78 | typedef JCOEF *JCOEFPTR; /* useful in a couple of places */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 79 | |
| 80 | |
| 81 | /* Types for JPEG compression parameters and working tables. */ |
| 82 | |
| 83 | |
| 84 | /* DCT coefficient quantization tables. */ |
| 85 | |
| 86 | typedef struct { |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 87 | /* This array gives the coefficient quantizers in natural array order |
| 88 | * (not the zigzag order in which they are stored in a JPEG DQT marker). |
| 89 | * CAUTION: IJG versions prior to v6a kept this array in zigzag order. |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 90 | */ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 91 | UINT16 quantval[DCTSIZE2]; /* quantization step for each coefficient */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 92 | /* This field is used only during compression. It's initialized FALSE when |
| 93 | * the table is created, and set TRUE when it's been output to the file. |
| 94 | * You could suppress output of a table by setting this to TRUE. |
| 95 | * (See jpeg_suppress_tables for an example.) |
| 96 | */ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 97 | boolean sent_table; /* TRUE when table has been output */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 98 | } JQUANT_TBL; |
| 99 | |
| 100 | |
| 101 | /* Huffman coding tables. */ |
| 102 | |
| 103 | typedef struct { |
| 104 | /* These two fields directly represent the contents of a JPEG DHT marker */ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 105 | UINT8 bits[17]; /* bits[k] = # of symbols with codes of */ |
| 106 | /* length k bits; bits[0] is unused */ |
| 107 | UINT8 huffval[256]; /* The symbols, in order of incr code length */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 108 | /* This field is used only during compression. It's initialized FALSE when |
| 109 | * the table is created, and set TRUE when it's been output to the file. |
| 110 | * You could suppress output of a table by setting this to TRUE. |
| 111 | * (See jpeg_suppress_tables for an example.) |
| 112 | */ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 113 | boolean sent_table; /* TRUE when table has been output */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 114 | } JHUFF_TBL; |
| 115 | |
| 116 | |
| 117 | /* Basic info about one component (color channel). */ |
| 118 | |
| 119 | typedef struct { |
| 120 | /* These values are fixed over the whole image. */ |
| 121 | /* For compression, they must be supplied by parameter setup; */ |
| 122 | /* for decompression, they are read from the SOF marker. */ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 123 | int component_id; /* identifier for this component (0..255) */ |
| 124 | int component_index; /* its index in SOF or cinfo->comp_info[] */ |
| 125 | int h_samp_factor; /* horizontal sampling factor (1..4) */ |
| 126 | int v_samp_factor; /* vertical sampling factor (1..4) */ |
| 127 | int quant_tbl_no; /* quantization table selector (0..3) */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 128 | /* These values may vary between scans. */ |
| 129 | /* For compression, they must be supplied by parameter setup; */ |
| 130 | /* for decompression, they are read from the SOS marker. */ |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 131 | /* The decompressor output side may not use these variables. */ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 132 | int dc_tbl_no; /* DC entropy table selector (0..3) */ |
| 133 | int ac_tbl_no; /* AC entropy table selector (0..3) */ |
| 134 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 135 | /* Remaining fields should be treated as private by applications. */ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 136 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 137 | /* These values are computed during compression or decompression startup: */ |
| 138 | /* Component's size in DCT blocks. |
| 139 | * Any dummy blocks added to complete an MCU are not counted; therefore |
| 140 | * these values do not depend on whether a scan is interleaved or not. |
| 141 | */ |
| 142 | JDIMENSION width_in_blocks; |
| 143 | JDIMENSION height_in_blocks; |
| 144 | /* Size of a DCT block in samples. Always DCTSIZE for compression. |
| 145 | * For decompression this is the size of the output from one DCT block, |
| 146 | * reflecting any scaling we choose to apply during the IDCT step. |
DRC | fe9c907 | 2014-04-18 07:58:29 +0000 | [diff] [blame] | 147 | * Values from 1 to 16 are supported. |
| 148 | * Note that different components may receive different IDCT scalings. |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 149 | */ |
DRC | 10acd81 | 2010-10-09 19:24:28 +0000 | [diff] [blame] | 150 | #if JPEG_LIB_VERSION >= 70 |
| 151 | int DCT_h_scaled_size; |
| 152 | int DCT_v_scaled_size; |
| 153 | #else |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 154 | int DCT_scaled_size; |
DRC | 10acd81 | 2010-10-09 19:24:28 +0000 | [diff] [blame] | 155 | #endif |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 156 | /* The downsampled dimensions are the component's actual, unpadded number |
| 157 | * of samples at the main buffer (preprocessing/compression interface), thus |
| 158 | * downsampled_width = ceil(image_width * Hi/Hmax) |
| 159 | * and similarly for height. For decompression, IDCT scaling is included, so |
DRC | 10acd81 | 2010-10-09 19:24:28 +0000 | [diff] [blame] | 160 | * downsampled_width = ceil(image_width * Hi/Hmax * DCT_[h_]scaled_size/DCTSIZE) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 161 | */ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 162 | JDIMENSION downsampled_width; /* actual width in samples */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 163 | JDIMENSION downsampled_height; /* actual height in samples */ |
| 164 | /* This flag is used only for decompression. In cases where some of the |
| 165 | * components will be ignored (eg grayscale output from YCbCr image), |
| 166 | * we can skip most computations for the unused components. |
| 167 | */ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 168 | boolean component_needed; /* do we need the value of this component? */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 169 | |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 170 | /* These values are computed before starting a scan of the component. */ |
| 171 | /* The decompressor output side may not use these variables. */ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 172 | int MCU_width; /* number of blocks per MCU, horizontally */ |
| 173 | int MCU_height; /* number of blocks per MCU, vertically */ |
| 174 | int MCU_blocks; /* MCU_width * MCU_height */ |
| 175 | int MCU_sample_width; /* MCU width in samples, MCU_width*DCT_[h_]scaled_size */ |
| 176 | int last_col_width; /* # of non-dummy blocks across in last MCU */ |
| 177 | int last_row_height; /* # of non-dummy blocks down in last MCU */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 178 | |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 179 | /* Saved quantization table for component; NULL if none yet saved. |
| 180 | * See jdinput.c comments about the need for this information. |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 181 | * This field is currently used only for decompression. |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 182 | */ |
| 183 | JQUANT_TBL * quant_table; |
| 184 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 185 | /* Private per-component storage for DCT or IDCT subsystem. */ |
| 186 | void * dct_table; |
| 187 | } jpeg_component_info; |
| 188 | |
| 189 | |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 190 | /* The script for encoding a multiple-scan file is an array of these: */ |
| 191 | |
| 192 | typedef struct { |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 193 | int comps_in_scan; /* number of components encoded in this scan */ |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 194 | int component_index[MAX_COMPS_IN_SCAN]; /* their SOF/comp_info[] indexes */ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 195 | int Ss, Se; /* progressive JPEG spectral selection parms */ |
| 196 | int Ah, Al; /* progressive JPEG successive approx. parms */ |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 197 | } jpeg_scan_info; |
| 198 | |
Thomas G. Lane | 5ead57a | 1998-03-27 00:00:00 +0000 | [diff] [blame] | 199 | /* The decompressor can save APPn and COM markers in a list of these: */ |
| 200 | |
DRC | 5033f3e | 2014-05-18 18:33:44 +0000 | [diff] [blame] | 201 | typedef struct jpeg_marker_struct * jpeg_saved_marker_ptr; |
Thomas G. Lane | 5ead57a | 1998-03-27 00:00:00 +0000 | [diff] [blame] | 202 | |
| 203 | struct jpeg_marker_struct { |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 204 | jpeg_saved_marker_ptr next; /* next in list, or NULL */ |
| 205 | UINT8 marker; /* marker code: JPEG_COM, or JPEG_APP0+n */ |
| 206 | unsigned int original_length; /* # bytes of data in the file */ |
| 207 | unsigned int data_length; /* # bytes of data saved at data[] */ |
DRC | 5033f3e | 2014-05-18 18:33:44 +0000 | [diff] [blame] | 208 | JOCTET * data; /* the data contained in the marker */ |
Thomas G. Lane | 5ead57a | 1998-03-27 00:00:00 +0000 | [diff] [blame] | 209 | /* the marker length word is not counted in data_length or original_length */ |
| 210 | }; |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 211 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 212 | /* Known color spaces. */ |
| 213 | |
DRC | f25c071 | 2009-04-03 12:00:51 +0000 | [diff] [blame] | 214 | #define JCS_EXTENSIONS 1 |
DRC | 67ce3b2 | 2011-12-19 02:21:03 +0000 | [diff] [blame] | 215 | #define JCS_ALPHA_EXTENSIONS 1 |
DRC | f25c071 | 2009-04-03 12:00:51 +0000 | [diff] [blame] | 216 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 217 | typedef enum { |
DRC | 333e918 | 2014-05-12 00:34:08 +0000 | [diff] [blame] | 218 | JCS_UNKNOWN, /* error/unspecified */ |
| 219 | JCS_GRAYSCALE, /* monochrome */ |
| 220 | JCS_RGB, /* red/green/blue as specified by the RGB_RED, |
| 221 | RGB_GREEN, RGB_BLUE, and RGB_PIXELSIZE macros */ |
| 222 | JCS_YCbCr, /* Y/Cb/Cr (also known as YUV) */ |
| 223 | JCS_CMYK, /* C/M/Y/K */ |
| 224 | JCS_YCCK, /* Y/Cb/Cr/K */ |
| 225 | JCS_EXT_RGB, /* red/green/blue */ |
| 226 | JCS_EXT_RGBX, /* red/green/blue/x */ |
| 227 | JCS_EXT_BGR, /* blue/green/red */ |
| 228 | JCS_EXT_BGRX, /* blue/green/red/x */ |
| 229 | JCS_EXT_XBGR, /* x/blue/green/red */ |
| 230 | JCS_EXT_XRGB, /* x/red/green/blue */ |
| 231 | /* When out_color_space it set to JCS_EXT_RGBX, JCS_EXT_BGRX, JCS_EXT_XBGR, |
| 232 | or JCS_EXT_XRGB during decompression, the X byte is undefined, and in |
| 233 | order to ensure the best performance, libjpeg-turbo can set that byte to |
| 234 | whatever value it wishes. Use the following colorspace constants to |
| 235 | ensure that the X byte is set to 0xFF, so that it can be interpreted as an |
| 236 | opaque alpha channel. */ |
| 237 | JCS_EXT_RGBA, /* red/green/blue/alpha */ |
| 238 | JCS_EXT_BGRA, /* blue/green/red/alpha */ |
| 239 | JCS_EXT_ABGR, /* alpha/blue/green/red */ |
DRC | 78df2e6 | 2014-05-12 09:23:57 +0000 | [diff] [blame] | 240 | JCS_EXT_ARGB, /* alpha/red/green/blue */ |
| 241 | JCS_RGB565 /* 5-bit red/6-bit green/5-bit blue */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 242 | } J_COLOR_SPACE; |
| 243 | |
| 244 | /* DCT/IDCT algorithm options. */ |
| 245 | |
| 246 | typedef enum { |
DRC | 333e918 | 2014-05-12 00:34:08 +0000 | [diff] [blame] | 247 | JDCT_ISLOW, /* slow but accurate integer algorithm */ |
| 248 | JDCT_IFAST, /* faster, less accurate integer method */ |
| 249 | JDCT_FLOAT /* floating-point: accurate, fast on fast HW */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 250 | } J_DCT_METHOD; |
| 251 | |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 252 | #ifndef JDCT_DEFAULT /* may be overridden in jconfig.h */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 253 | #define JDCT_DEFAULT JDCT_ISLOW |
| 254 | #endif |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 255 | #ifndef JDCT_FASTEST /* may be overridden in jconfig.h */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 256 | #define JDCT_FASTEST JDCT_IFAST |
| 257 | #endif |
| 258 | |
| 259 | /* Dithering options for decompression. */ |
| 260 | |
| 261 | typedef enum { |
DRC | 333e918 | 2014-05-12 00:34:08 +0000 | [diff] [blame] | 262 | JDITHER_NONE, /* no dithering */ |
| 263 | JDITHER_ORDERED, /* simple ordered dither */ |
| 264 | JDITHER_FS /* Floyd-Steinberg error diffusion dither */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 265 | } J_DITHER_MODE; |
| 266 | |
| 267 | |
| 268 | /* Common fields between JPEG compression and decompression master structs. */ |
| 269 | |
| 270 | #define jpeg_common_fields \ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 271 | struct jpeg_error_mgr * err; /* Error handler module */\ |
| 272 | struct jpeg_memory_mgr * mem; /* Memory manager module */\ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 273 | struct jpeg_progress_mgr * progress; /* Progress monitor, or NULL if none */\ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 274 | void * client_data; /* Available for use by application */\ |
| 275 | boolean is_decompressor; /* So common code can tell which is which */\ |
| 276 | int global_state /* For checking call sequence validity */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 277 | |
| 278 | /* Routines that are to be used by both halves of the library are declared |
| 279 | * to receive a pointer to this structure. There are no actual instances of |
| 280 | * jpeg_common_struct, only of jpeg_compress_struct and jpeg_decompress_struct. |
| 281 | */ |
| 282 | struct jpeg_common_struct { |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 283 | jpeg_common_fields; /* Fields common to both master struct types */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 284 | /* Additional fields follow in an actual jpeg_compress_struct or |
| 285 | * jpeg_decompress_struct. All three structs must agree on these |
| 286 | * initial fields! (This would be a lot cleaner in C++.) |
| 287 | */ |
| 288 | }; |
| 289 | |
| 290 | typedef struct jpeg_common_struct * j_common_ptr; |
| 291 | typedef struct jpeg_compress_struct * j_compress_ptr; |
| 292 | typedef struct jpeg_decompress_struct * j_decompress_ptr; |
| 293 | |
| 294 | |
| 295 | /* Master record for a compression instance */ |
| 296 | |
| 297 | struct jpeg_compress_struct { |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 298 | jpeg_common_fields; /* Fields shared with jpeg_decompress_struct */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 299 | |
| 300 | /* Destination for compressed data */ |
| 301 | struct jpeg_destination_mgr * dest; |
| 302 | |
| 303 | /* Description of source image --- these fields must be filled in by |
| 304 | * outer application before starting compression. in_color_space must |
| 305 | * be correct before you can even call jpeg_set_defaults(). |
| 306 | */ |
| 307 | |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 308 | JDIMENSION image_width; /* input image width */ |
| 309 | JDIMENSION image_height; /* input image height */ |
| 310 | int input_components; /* # of color components in input image */ |
| 311 | J_COLOR_SPACE in_color_space; /* colorspace of input image */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 312 | |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 313 | double input_gamma; /* image gamma of input image */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 314 | |
| 315 | /* Compression parameters --- these fields must be set before calling |
| 316 | * jpeg_start_compress(). We recommend calling jpeg_set_defaults() to |
| 317 | * initialize everything to reasonable defaults, then changing anything |
| 318 | * the application specifically wants to change. That way you won't get |
| 319 | * burnt when new parameters are added. Also note that there are several |
| 320 | * helper routines to simplify changing parameters. |
| 321 | */ |
| 322 | |
DRC | 36a6eec | 2010-10-08 08:05:44 +0000 | [diff] [blame] | 323 | #if JPEG_LIB_VERSION >= 70 |
Guido Vollbeding | 5996a25 | 2009-06-27 00:00:00 +0000 | [diff] [blame] | 324 | unsigned int scale_num, scale_denom; /* fraction by which to scale image */ |
| 325 | |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 326 | JDIMENSION jpeg_width; /* scaled JPEG image width */ |
| 327 | JDIMENSION jpeg_height; /* scaled JPEG image height */ |
Guido Vollbeding | 5996a25 | 2009-06-27 00:00:00 +0000 | [diff] [blame] | 328 | /* Dimensions of actual JPEG image that will be written to file, |
| 329 | * derived from input dimensions by scaling factors above. |
| 330 | * These fields are computed by jpeg_start_compress(). |
| 331 | * You can also use jpeg_calc_jpeg_dimensions() to determine these values |
| 332 | * in advance of calling jpeg_start_compress(). |
| 333 | */ |
DRC | 36a6eec | 2010-10-08 08:05:44 +0000 | [diff] [blame] | 334 | #endif |
Guido Vollbeding | 5996a25 | 2009-06-27 00:00:00 +0000 | [diff] [blame] | 335 | |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 336 | int data_precision; /* bits of precision in image data */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 337 | |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 338 | int num_components; /* # of color components in JPEG image */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 339 | J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */ |
| 340 | |
| 341 | jpeg_component_info * comp_info; |
| 342 | /* comp_info[i] describes component that appears i'th in SOF */ |
Guido Vollbeding | 5996a25 | 2009-06-27 00:00:00 +0000 | [diff] [blame] | 343 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 344 | JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS]; |
DRC | 36a6eec | 2010-10-08 08:05:44 +0000 | [diff] [blame] | 345 | #if JPEG_LIB_VERSION >= 70 |
Guido Vollbeding | 5996a25 | 2009-06-27 00:00:00 +0000 | [diff] [blame] | 346 | int q_scale_factor[NUM_QUANT_TBLS]; |
DRC | 36a6eec | 2010-10-08 08:05:44 +0000 | [diff] [blame] | 347 | #endif |
Guido Vollbeding | 5996a25 | 2009-06-27 00:00:00 +0000 | [diff] [blame] | 348 | /* ptrs to coefficient quantization tables, or NULL if not defined, |
| 349 | * and corresponding scale factors (percentage, initialized 100). |
| 350 | */ |
| 351 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 352 | JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS]; |
| 353 | JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS]; |
| 354 | /* ptrs to Huffman coding tables, or NULL if not defined */ |
Guido Vollbeding | 5996a25 | 2009-06-27 00:00:00 +0000 | [diff] [blame] | 355 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 356 | UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */ |
| 357 | UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */ |
| 358 | UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */ |
| 359 | |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 360 | int num_scans; /* # of entries in scan_info array */ |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 361 | const jpeg_scan_info * scan_info; /* script for multi-scan file, or NULL */ |
| 362 | /* The default value of scan_info is NULL, which causes a single-scan |
| 363 | * sequential JPEG file to be emitted. To create a multi-scan file, |
| 364 | * set num_scans and scan_info to point to an array of scan definitions. |
| 365 | */ |
| 366 | |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 367 | boolean raw_data_in; /* TRUE=caller supplies downsampled data */ |
| 368 | boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */ |
| 369 | boolean optimize_coding; /* TRUE=optimize entropy encoding parms */ |
| 370 | boolean CCIR601_sampling; /* TRUE=first samples are cosited */ |
DRC | 36a6eec | 2010-10-08 08:05:44 +0000 | [diff] [blame] | 371 | #if JPEG_LIB_VERSION >= 70 |
Guido Vollbeding | 5996a25 | 2009-06-27 00:00:00 +0000 | [diff] [blame] | 372 | boolean do_fancy_downsampling; /* TRUE=apply fancy downsampling */ |
DRC | 36a6eec | 2010-10-08 08:05:44 +0000 | [diff] [blame] | 373 | #endif |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 374 | int smoothing_factor; /* 1..100, or 0 for no input smoothing */ |
| 375 | J_DCT_METHOD dct_method; /* DCT algorithm selector */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 376 | |
| 377 | /* The restart interval can be specified in absolute MCUs by setting |
| 378 | * restart_interval, or in MCU rows by setting restart_in_rows |
| 379 | * (in which case the correct restart_interval will be figured |
| 380 | * for each scan). |
| 381 | */ |
| 382 | unsigned int restart_interval; /* MCUs per restart, or 0 for no restart */ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 383 | int restart_in_rows; /* if > 0, MCU rows per restart interval */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 384 | |
| 385 | /* Parameters controlling emission of special markers. */ |
| 386 | |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 387 | boolean write_JFIF_header; /* should a JFIF marker be written? */ |
| 388 | UINT8 JFIF_major_version; /* What to write for the JFIF version number */ |
Thomas G. Lane | 5ead57a | 1998-03-27 00:00:00 +0000 | [diff] [blame] | 389 | UINT8 JFIF_minor_version; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 390 | /* These three values are not used by the JPEG code, merely copied */ |
| 391 | /* into the JFIF APP0 marker. density_unit can be 0 for unknown, */ |
| 392 | /* 1 for dots/inch, or 2 for dots/cm. Note that the pixel aspect */ |
| 393 | /* ratio is defined by X_density/Y_density even when density_unit=0. */ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 394 | UINT8 density_unit; /* JFIF code for pixel size units */ |
| 395 | UINT16 X_density; /* Horizontal pixel density */ |
| 396 | UINT16 Y_density; /* Vertical pixel density */ |
| 397 | boolean write_Adobe_marker; /* should an Adobe marker be written? */ |
| 398 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 399 | /* State variable: index of next scanline to be written to |
| 400 | * jpeg_write_scanlines(). Application may use this to control its |
| 401 | * processing loop, e.g., "while (next_scanline < image_height)". |
| 402 | */ |
| 403 | |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 404 | JDIMENSION next_scanline; /* 0 .. image_height-1 */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 405 | |
| 406 | /* Remaining fields are known throughout compressor, but generally |
| 407 | * should not be touched by a surrounding application. |
| 408 | */ |
| 409 | |
| 410 | /* |
| 411 | * These fields are computed during compression startup |
| 412 | */ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 413 | boolean progressive_mode; /* TRUE if scan script uses progressive mode */ |
| 414 | int max_h_samp_factor; /* largest h_samp_factor */ |
| 415 | int max_v_samp_factor; /* largest v_samp_factor */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 416 | |
DRC | 36a6eec | 2010-10-08 08:05:44 +0000 | [diff] [blame] | 417 | #if JPEG_LIB_VERSION >= 70 |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 418 | int min_DCT_h_scaled_size; /* smallest DCT_h_scaled_size of any component */ |
| 419 | int min_DCT_v_scaled_size; /* smallest DCT_v_scaled_size of any component */ |
DRC | 36a6eec | 2010-10-08 08:05:44 +0000 | [diff] [blame] | 420 | #endif |
Guido Vollbeding | 5996a25 | 2009-06-27 00:00:00 +0000 | [diff] [blame] | 421 | |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 422 | JDIMENSION total_iMCU_rows; /* # of iMCU rows to be input to coef ctlr */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 423 | /* The coefficient controller receives data in units of MCU rows as defined |
| 424 | * for fully interleaved scans (whether the JPEG file is interleaved or not). |
| 425 | * There are v_samp_factor * DCTSIZE sample rows of each component in an |
| 426 | * "iMCU" (interleaved MCU) row. |
| 427 | */ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 428 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 429 | /* |
| 430 | * These fields are valid during any one scan. |
| 431 | * They describe the components and MCUs actually appearing in the scan. |
| 432 | */ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 433 | int comps_in_scan; /* # of JPEG components in this scan */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 434 | jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN]; |
| 435 | /* *cur_comp_info[i] describes component that appears i'th in SOS */ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 436 | |
| 437 | JDIMENSION MCUs_per_row; /* # of MCUs across the image */ |
| 438 | JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */ |
| 439 | |
| 440 | int blocks_in_MCU; /* # of DCT blocks per MCU */ |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 441 | int MCU_membership[C_MAX_BLOCKS_IN_MCU]; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 442 | /* MCU_membership[i] is index in cur_comp_info of component owning */ |
| 443 | /* i'th block in an MCU */ |
| 444 | |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 445 | int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */ |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 446 | |
DRC | 36a6eec | 2010-10-08 08:05:44 +0000 | [diff] [blame] | 447 | #if JPEG_LIB_VERSION >= 80 |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 448 | int block_size; /* the basic DCT block size: 1..16 */ |
| 449 | const int * natural_order; /* natural-order position array */ |
| 450 | int lim_Se; /* min( Se, DCTSIZE2-1 ) */ |
DRC | 36a6eec | 2010-10-08 08:05:44 +0000 | [diff] [blame] | 451 | #endif |
Guido Vollbeding | 989630f | 2010-01-10 00:00:00 +0000 | [diff] [blame] | 452 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 453 | /* |
| 454 | * Links to compression subobjects (methods and private variables of modules) |
| 455 | */ |
| 456 | struct jpeg_comp_master * master; |
| 457 | struct jpeg_c_main_controller * main; |
| 458 | struct jpeg_c_prep_controller * prep; |
| 459 | struct jpeg_c_coef_controller * coef; |
| 460 | struct jpeg_marker_writer * marker; |
| 461 | struct jpeg_color_converter * cconvert; |
| 462 | struct jpeg_downsampler * downsample; |
| 463 | struct jpeg_forward_dct * fdct; |
| 464 | struct jpeg_entropy_encoder * entropy; |
Thomas G. Lane | 5ead57a | 1998-03-27 00:00:00 +0000 | [diff] [blame] | 465 | jpeg_scan_info * script_space; /* workspace for jpeg_simple_progression */ |
| 466 | int script_space_size; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 467 | }; |
| 468 | |
| 469 | |
| 470 | /* Master record for a decompression instance */ |
| 471 | |
| 472 | struct jpeg_decompress_struct { |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 473 | jpeg_common_fields; /* Fields shared with jpeg_compress_struct */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 474 | |
| 475 | /* Source of compressed data */ |
| 476 | struct jpeg_source_mgr * src; |
| 477 | |
| 478 | /* Basic description of image --- filled in by jpeg_read_header(). */ |
| 479 | /* Application may inspect these values to decide how to process image. */ |
| 480 | |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 481 | JDIMENSION image_width; /* nominal image width (from SOF marker) */ |
| 482 | JDIMENSION image_height; /* nominal image height */ |
| 483 | int num_components; /* # of color components in JPEG image */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 484 | J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */ |
| 485 | |
| 486 | /* Decompression processing parameters --- these fields must be set before |
| 487 | * calling jpeg_start_decompress(). Note that jpeg_read_header() initializes |
| 488 | * them to default values. |
| 489 | */ |
| 490 | |
| 491 | J_COLOR_SPACE out_color_space; /* colorspace for output */ |
| 492 | |
| 493 | unsigned int scale_num, scale_denom; /* fraction by which to scale image */ |
| 494 | |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 495 | double output_gamma; /* image gamma wanted in output */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 496 | |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 497 | boolean buffered_image; /* TRUE=multiple output passes */ |
| 498 | boolean raw_data_out; /* TRUE=downsampled data wanted */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 499 | |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 500 | J_DCT_METHOD dct_method; /* IDCT algorithm selector */ |
| 501 | boolean do_fancy_upsampling; /* TRUE=apply fancy upsampling */ |
| 502 | boolean do_block_smoothing; /* TRUE=apply interblock smoothing */ |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 503 | |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 504 | boolean quantize_colors; /* TRUE=colormapped output wanted */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 505 | /* the following are ignored if not quantize_colors: */ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 506 | J_DITHER_MODE dither_mode; /* type of color dithering to use */ |
| 507 | boolean two_pass_quantize; /* TRUE=use two-pass color quantization */ |
| 508 | int desired_number_of_colors; /* max # colors to use in created colormap */ |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 509 | /* these are significant only in buffered-image mode: */ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 510 | boolean enable_1pass_quant; /* enable future use of 1-pass quantizer */ |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 511 | boolean enable_external_quant;/* enable future use of external colormap */ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 512 | boolean enable_2pass_quant; /* enable future use of 2-pass quantizer */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 513 | |
| 514 | /* Description of actual output image that will be returned to application. |
| 515 | * These fields are computed by jpeg_start_decompress(). |
| 516 | * You can also use jpeg_calc_output_dimensions() to determine these values |
| 517 | * in advance of calling jpeg_start_decompress(). |
| 518 | */ |
| 519 | |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 520 | JDIMENSION output_width; /* scaled image width */ |
| 521 | JDIMENSION output_height; /* scaled image height */ |
| 522 | int out_color_components; /* # of color components in out_color_space */ |
| 523 | int output_components; /* # of color components returned */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 524 | /* output_components is 1 (a colormap index) when quantizing colors; |
| 525 | * otherwise it equals out_color_components. |
| 526 | */ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 527 | int rec_outbuf_height; /* min recommended height of scanline buffer */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 528 | /* If the buffer passed to jpeg_read_scanlines() is less than this many rows |
| 529 | * high, space and time will be wasted due to unnecessary data copying. |
| 530 | * Usually rec_outbuf_height will be 1 or 2, at most 4. |
| 531 | */ |
| 532 | |
| 533 | /* When quantizing colors, the output colormap is described by these fields. |
| 534 | * The application can supply a colormap by setting colormap non-NULL before |
| 535 | * calling jpeg_start_decompress; otherwise a colormap is created during |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 536 | * jpeg_start_decompress or jpeg_start_output. |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 537 | * The map has out_color_components rows and actual_number_of_colors columns. |
| 538 | */ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 539 | int actual_number_of_colors; /* number of entries in use */ |
| 540 | JSAMPARRAY colormap; /* The color map as a 2-D pixel array */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 541 | |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 542 | /* State variables: these variables indicate the progress of decompression. |
| 543 | * The application may examine these but must not modify them. |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 544 | */ |
| 545 | |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 546 | /* Row index of next scanline to be read from jpeg_read_scanlines(). |
| 547 | * Application may use this to control its processing loop, e.g., |
| 548 | * "while (output_scanline < output_height)". |
| 549 | */ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 550 | JDIMENSION output_scanline; /* 0 .. output_height-1 */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 551 | |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 552 | /* Current input scan number and number of iMCU rows completed in scan. |
| 553 | * These indicate the progress of the decompressor input side. |
| 554 | */ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 555 | int input_scan_number; /* Number of SOS markers seen so far */ |
| 556 | JDIMENSION input_iMCU_row; /* Number of iMCU rows completed */ |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 557 | |
| 558 | /* The "output scan number" is the notional scan being displayed by the |
| 559 | * output side. The decompressor will not allow output scan/row number |
| 560 | * to get ahead of input scan/row, but it can fall arbitrarily far behind. |
| 561 | */ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 562 | int output_scan_number; /* Nominal scan number being displayed */ |
| 563 | JDIMENSION output_iMCU_row; /* Number of iMCU rows read */ |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 564 | |
| 565 | /* Current progression status. coef_bits[c][i] indicates the precision |
| 566 | * with which component c's DCT coefficient i (in zigzag order) is known. |
| 567 | * It is -1 when no data has yet been received, otherwise it is the point |
| 568 | * transform (shift) value for the most recent scan of the coefficient |
| 569 | * (thus, 0 at completion of the progression). |
| 570 | * This pointer is NULL when reading a non-progressive file. |
| 571 | */ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 572 | int (*coef_bits)[DCTSIZE2]; /* -1 or current Al value for each coef */ |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 573 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 574 | /* Internal JPEG parameters --- the application usually need not look at |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 575 | * these fields. Note that the decompressor output side may not use |
| 576 | * any parameters that can change between scans. |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 577 | */ |
| 578 | |
| 579 | /* Quantization and Huffman tables are carried forward across input |
| 580 | * datastreams when processing abbreviated JPEG datastreams. |
| 581 | */ |
| 582 | |
| 583 | JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS]; |
| 584 | /* ptrs to coefficient quantization tables, or NULL if not defined */ |
| 585 | |
| 586 | JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS]; |
| 587 | JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS]; |
| 588 | /* ptrs to Huffman coding tables, or NULL if not defined */ |
| 589 | |
| 590 | /* These parameters are never carried across datastreams, since they |
| 591 | * are given in SOF/SOS markers or defined to be reset by SOI. |
| 592 | */ |
| 593 | |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 594 | int data_precision; /* bits of precision in image data */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 595 | |
| 596 | jpeg_component_info * comp_info; |
| 597 | /* comp_info[i] describes component that appears i'th in SOF */ |
| 598 | |
DRC | 36a6eec | 2010-10-08 08:05:44 +0000 | [diff] [blame] | 599 | #if JPEG_LIB_VERSION >= 80 |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 600 | boolean is_baseline; /* TRUE if Baseline SOF0 encountered */ |
DRC | 36a6eec | 2010-10-08 08:05:44 +0000 | [diff] [blame] | 601 | #endif |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 602 | boolean progressive_mode; /* TRUE if SOFn specifies progressive mode */ |
| 603 | boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */ |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 604 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 605 | UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */ |
| 606 | UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */ |
| 607 | UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */ |
| 608 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 609 | unsigned int restart_interval; /* MCUs per restart interval, or 0 for no restart */ |
| 610 | |
| 611 | /* These fields record data obtained from optional markers recognized by |
| 612 | * the JPEG library. |
| 613 | */ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 614 | boolean saw_JFIF_marker; /* TRUE iff a JFIF APP0 marker was found */ |
Thomas G. Lane | 5ead57a | 1998-03-27 00:00:00 +0000 | [diff] [blame] | 615 | /* Data copied from JFIF marker; only valid if saw_JFIF_marker is TRUE: */ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 616 | UINT8 JFIF_major_version; /* JFIF version number */ |
Thomas G. Lane | 5ead57a | 1998-03-27 00:00:00 +0000 | [diff] [blame] | 617 | UINT8 JFIF_minor_version; |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 618 | UINT8 density_unit; /* JFIF code for pixel size units */ |
| 619 | UINT16 X_density; /* Horizontal pixel density */ |
| 620 | UINT16 Y_density; /* Vertical pixel density */ |
| 621 | boolean saw_Adobe_marker; /* TRUE iff an Adobe APP14 marker was found */ |
| 622 | UINT8 Adobe_transform; /* Color transform code from Adobe marker */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 623 | |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 624 | boolean CCIR601_sampling; /* TRUE=first samples are cosited */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 625 | |
Thomas G. Lane | 5ead57a | 1998-03-27 00:00:00 +0000 | [diff] [blame] | 626 | /* Aside from the specific data retained from APPn markers known to the |
| 627 | * library, the uninterpreted contents of any or all APPn and COM markers |
| 628 | * can be saved in a list for examination by the application. |
| 629 | */ |
| 630 | jpeg_saved_marker_ptr marker_list; /* Head of list of saved markers */ |
| 631 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 632 | /* Remaining fields are known throughout decompressor, but generally |
| 633 | * should not be touched by a surrounding application. |
| 634 | */ |
| 635 | |
| 636 | /* |
| 637 | * These fields are computed during decompression startup |
| 638 | */ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 639 | int max_h_samp_factor; /* largest h_samp_factor */ |
| 640 | int max_v_samp_factor; /* largest v_samp_factor */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 641 | |
DRC | 36a6eec | 2010-10-08 08:05:44 +0000 | [diff] [blame] | 642 | #if JPEG_LIB_VERSION >= 70 |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 643 | int min_DCT_h_scaled_size; /* smallest DCT_h_scaled_size of any component */ |
| 644 | int min_DCT_v_scaled_size; /* smallest DCT_v_scaled_size of any component */ |
DRC | 36a6eec | 2010-10-08 08:05:44 +0000 | [diff] [blame] | 645 | #else |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 646 | int min_DCT_scaled_size; /* smallest DCT_scaled_size of any component */ |
DRC | 36a6eec | 2010-10-08 08:05:44 +0000 | [diff] [blame] | 647 | #endif |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 648 | |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 649 | JDIMENSION total_iMCU_rows; /* # of iMCU rows in image */ |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 650 | /* The coefficient controller's input and output progress is measured in |
| 651 | * units of "iMCU" (interleaved MCU) rows. These are the same as MCU rows |
| 652 | * in fully interleaved JPEG scans, but are used whether the scan is |
| 653 | * interleaved or not. We define an iMCU row as v_samp_factor DCT block |
| 654 | * rows of each component. Therefore, the IDCT output contains |
DRC | 36a6eec | 2010-10-08 08:05:44 +0000 | [diff] [blame] | 655 | * v_samp_factor*DCT_[v_]scaled_size sample rows of a component per iMCU row. |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 656 | */ |
| 657 | |
| 658 | JSAMPLE * sample_range_limit; /* table for fast range-limiting */ |
| 659 | |
| 660 | /* |
| 661 | * These fields are valid during any one scan. |
| 662 | * They describe the components and MCUs actually appearing in the scan. |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 663 | * Note that the decompressor output side must not use these fields. |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 664 | */ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 665 | int comps_in_scan; /* # of JPEG components in this scan */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 666 | jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN]; |
| 667 | /* *cur_comp_info[i] describes component that appears i'th in SOS */ |
| 668 | |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 669 | JDIMENSION MCUs_per_row; /* # of MCUs across the image */ |
| 670 | JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 671 | |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 672 | int blocks_in_MCU; /* # of DCT blocks per MCU */ |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 673 | int MCU_membership[D_MAX_BLOCKS_IN_MCU]; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 674 | /* MCU_membership[i] is index in cur_comp_info of component owning */ |
| 675 | /* i'th block in an MCU */ |
| 676 | |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 677 | int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */ |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 678 | |
DRC | 36a6eec | 2010-10-08 08:05:44 +0000 | [diff] [blame] | 679 | #if JPEG_LIB_VERSION >= 80 |
Guido Vollbeding | 989630f | 2010-01-10 00:00:00 +0000 | [diff] [blame] | 680 | /* These fields are derived from Se of first SOS marker. |
| 681 | */ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 682 | int block_size; /* the basic DCT block size: 1..16 */ |
Guido Vollbeding | 989630f | 2010-01-10 00:00:00 +0000 | [diff] [blame] | 683 | const int * natural_order; /* natural-order position array for entropy decode */ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 684 | int lim_Se; /* min( Se, DCTSIZE2-1 ) for entropy decode */ |
DRC | 36a6eec | 2010-10-08 08:05:44 +0000 | [diff] [blame] | 685 | #endif |
Guido Vollbeding | 989630f | 2010-01-10 00:00:00 +0000 | [diff] [blame] | 686 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 687 | /* This field is shared between entropy decoder and marker parser. |
| 688 | * It is either zero or the code of a JPEG marker that has been |
| 689 | * read from the data source, but has not yet been processed. |
| 690 | */ |
| 691 | int unread_marker; |
| 692 | |
| 693 | /* |
| 694 | * Links to decompression subobjects (methods, private variables of modules) |
| 695 | */ |
| 696 | struct jpeg_decomp_master * master; |
| 697 | struct jpeg_d_main_controller * main; |
| 698 | struct jpeg_d_coef_controller * coef; |
| 699 | struct jpeg_d_post_controller * post; |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 700 | struct jpeg_input_controller * inputctl; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 701 | struct jpeg_marker_reader * marker; |
| 702 | struct jpeg_entropy_decoder * entropy; |
| 703 | struct jpeg_inverse_dct * idct; |
| 704 | struct jpeg_upsampler * upsample; |
| 705 | struct jpeg_color_deconverter * cconvert; |
| 706 | struct jpeg_color_quantizer * cquantize; |
| 707 | }; |
| 708 | |
| 709 | |
| 710 | /* "Object" declarations for JPEG modules that may be supplied or called |
| 711 | * directly by the surrounding application. |
| 712 | * As with all objects in the JPEG library, these structs only define the |
| 713 | * publicly visible methods and state variables of a module. Additional |
| 714 | * private fields may exist after the public ones. |
| 715 | */ |
| 716 | |
| 717 | |
| 718 | /* Error handler object */ |
| 719 | |
| 720 | struct jpeg_error_mgr { |
| 721 | /* Error exit handler: does not return to caller */ |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 722 | void (*error_exit) (j_common_ptr cinfo); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 723 | /* Conditionally emit a trace or warning message */ |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 724 | void (*emit_message) (j_common_ptr cinfo, int msg_level); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 725 | /* Routine that actually outputs a trace or error message */ |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 726 | void (*output_message) (j_common_ptr cinfo); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 727 | /* Format a message string for the most recent JPEG error or message */ |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 728 | void (*format_message) (j_common_ptr cinfo, char * buffer); |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 729 | #define JMSG_LENGTH_MAX 200 /* recommended size of format_message buffer */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 730 | /* Reset error state variables at start of a new image */ |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 731 | void (*reset_error_mgr) (j_common_ptr cinfo); |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 732 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 733 | /* The message ID code and any parameters are saved here. |
| 734 | * A message can have one string parameter or up to 8 int parameters. |
| 735 | */ |
| 736 | int msg_code; |
| 737 | #define JMSG_STR_PARM_MAX 80 |
| 738 | union { |
| 739 | int i[8]; |
| 740 | char s[JMSG_STR_PARM_MAX]; |
| 741 | } msg_parm; |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 742 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 743 | /* Standard state variables for error facility */ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 744 | |
| 745 | int trace_level; /* max msg_level that will be displayed */ |
| 746 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 747 | /* For recoverable corrupt-data errors, we emit a warning message, |
| 748 | * but keep going unless emit_message chooses to abort. emit_message |
| 749 | * should count warnings in num_warnings. The surrounding application |
| 750 | * can check for bad data by seeing if num_warnings is nonzero at the |
| 751 | * end of processing. |
| 752 | */ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 753 | long num_warnings; /* number of corrupt-data warnings */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 754 | |
| 755 | /* These fields point to the table(s) of error message strings. |
| 756 | * An application can change the table pointer to switch to a different |
| 757 | * message list (typically, to change the language in which errors are |
| 758 | * reported). Some applications may wish to add additional error codes |
| 759 | * that will be handled by the JPEG library error mechanism; the second |
| 760 | * table pointer is used for this purpose. |
| 761 | * |
| 762 | * First table includes all errors generated by JPEG library itself. |
| 763 | * Error code 0 is reserved for a "no such error string" message. |
| 764 | */ |
| 765 | const char * const * jpeg_message_table; /* Library errors */ |
| 766 | int last_jpeg_message; /* Table contains strings 0..last_jpeg_message */ |
| 767 | /* Second table can be added by application (see cjpeg/djpeg for example). |
| 768 | * It contains strings numbered first_addon_message..last_addon_message. |
| 769 | */ |
| 770 | const char * const * addon_message_table; /* Non-library errors */ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 771 | int first_addon_message; /* code for first string in addon table */ |
| 772 | int last_addon_message; /* code for last string in addon table */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 773 | }; |
| 774 | |
| 775 | |
| 776 | /* Progress monitor object */ |
| 777 | |
| 778 | struct jpeg_progress_mgr { |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 779 | void (*progress_monitor) (j_common_ptr cinfo); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 780 | |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 781 | long pass_counter; /* work units completed in this pass */ |
| 782 | long pass_limit; /* total number of work units in this pass */ |
| 783 | int completed_passes; /* passes completed so far */ |
| 784 | int total_passes; /* total number of passes expected */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 785 | }; |
| 786 | |
| 787 | |
| 788 | /* Data destination object for compression */ |
| 789 | |
| 790 | struct jpeg_destination_mgr { |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 791 | JOCTET * next_output_byte; /* => next byte to write in buffer */ |
| 792 | size_t free_in_buffer; /* # of byte spaces remaining in buffer */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 793 | |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 794 | void (*init_destination) (j_compress_ptr cinfo); |
| 795 | boolean (*empty_output_buffer) (j_compress_ptr cinfo); |
| 796 | void (*term_destination) (j_compress_ptr cinfo); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 797 | }; |
| 798 | |
| 799 | |
| 800 | /* Data source object for decompression */ |
| 801 | |
| 802 | struct jpeg_source_mgr { |
| 803 | const JOCTET * next_input_byte; /* => next byte to read from buffer */ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 804 | size_t bytes_in_buffer; /* # of bytes remaining in buffer */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 805 | |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 806 | void (*init_source) (j_decompress_ptr cinfo); |
| 807 | boolean (*fill_input_buffer) (j_decompress_ptr cinfo); |
| 808 | void (*skip_input_data) (j_decompress_ptr cinfo, long num_bytes); |
| 809 | boolean (*resync_to_restart) (j_decompress_ptr cinfo, int desired); |
| 810 | void (*term_source) (j_decompress_ptr cinfo); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 811 | }; |
| 812 | |
| 813 | |
| 814 | /* Memory manager object. |
| 815 | * Allocates "small" objects (a few K total), "large" objects (tens of K), |
| 816 | * and "really big" objects (virtual arrays with backing store if needed). |
| 817 | * The memory manager does not allow individual objects to be freed; rather, |
| 818 | * each created object is assigned to a pool, and whole pools can be freed |
| 819 | * at once. This is faster and more convenient than remembering exactly what |
| 820 | * to free, especially where malloc()/free() are not too speedy. |
| 821 | * NB: alloc routines never return NULL. They exit to error_exit if not |
| 822 | * successful. |
| 823 | */ |
| 824 | |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 825 | #define JPOOL_PERMANENT 0 /* lasts until master record is destroyed */ |
| 826 | #define JPOOL_IMAGE 1 /* lasts until done with image/datastream */ |
| 827 | #define JPOOL_NUMPOOLS 2 |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 828 | |
| 829 | typedef struct jvirt_sarray_control * jvirt_sarray_ptr; |
| 830 | typedef struct jvirt_barray_control * jvirt_barray_ptr; |
| 831 | |
| 832 | |
| 833 | struct jpeg_memory_mgr { |
| 834 | /* Method pointers */ |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 835 | void * (*alloc_small) (j_common_ptr cinfo, int pool_id, size_t sizeofobject); |
DRC | 5033f3e | 2014-05-18 18:33:44 +0000 | [diff] [blame] | 836 | void * (*alloc_large) (j_common_ptr cinfo, int pool_id, |
| 837 | size_t sizeofobject); |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 838 | JSAMPARRAY (*alloc_sarray) (j_common_ptr cinfo, int pool_id, |
| 839 | JDIMENSION samplesperrow, JDIMENSION numrows); |
| 840 | JBLOCKARRAY (*alloc_barray) (j_common_ptr cinfo, int pool_id, |
| 841 | JDIMENSION blocksperrow, JDIMENSION numrows); |
| 842 | jvirt_sarray_ptr (*request_virt_sarray) (j_common_ptr cinfo, int pool_id, |
| 843 | boolean pre_zero, |
| 844 | JDIMENSION samplesperrow, |
| 845 | JDIMENSION numrows, |
| 846 | JDIMENSION maxaccess); |
| 847 | jvirt_barray_ptr (*request_virt_barray) (j_common_ptr cinfo, int pool_id, |
| 848 | boolean pre_zero, |
| 849 | JDIMENSION blocksperrow, |
| 850 | JDIMENSION numrows, |
| 851 | JDIMENSION maxaccess); |
| 852 | void (*realize_virt_arrays) (j_common_ptr cinfo); |
| 853 | JSAMPARRAY (*access_virt_sarray) (j_common_ptr cinfo, jvirt_sarray_ptr ptr, |
| 854 | JDIMENSION start_row, JDIMENSION num_rows, |
| 855 | boolean writable); |
| 856 | JBLOCKARRAY (*access_virt_barray) (j_common_ptr cinfo, jvirt_barray_ptr ptr, |
| 857 | JDIMENSION start_row, JDIMENSION num_rows, |
| 858 | boolean writable); |
| 859 | void (*free_pool) (j_common_ptr cinfo, int pool_id); |
| 860 | void (*self_destruct) (j_common_ptr cinfo); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 861 | |
| 862 | /* Limit on memory allocation for this JPEG object. (Note that this is |
| 863 | * merely advisory, not a guaranteed maximum; it only affects the space |
| 864 | * used for virtual-array buffers.) May be changed by outer application |
| 865 | * after creating the JPEG object. |
| 866 | */ |
| 867 | long max_memory_to_use; |
Thomas G. Lane | 5ead57a | 1998-03-27 00:00:00 +0000 | [diff] [blame] | 868 | |
| 869 | /* Maximum allocation request accepted by alloc_large. */ |
| 870 | long max_alloc_chunk; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 871 | }; |
| 872 | |
| 873 | |
| 874 | /* Routine signature for application-supplied marker processing methods. |
| 875 | * Need not pass marker code since it is stored in cinfo->unread_marker. |
| 876 | */ |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 877 | typedef boolean (*jpeg_marker_parser_method) (j_decompress_ptr cinfo); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 878 | |
| 879 | |
DRC | e2dd3e3 | 2014-11-25 09:48:15 +0000 | [diff] [blame] | 880 | /* Originally, this macro was used as a way of defining function prototypes |
| 881 | * for both modern compilers as well as older compilers that did not support |
DRC | 2a6b831 | 2014-11-25 10:07:43 +0000 | [diff] [blame] | 882 | * prototype parameters. libjpeg-turbo has never supported these older, |
| 883 | * non-ANSI compilers, but the macro is still included because there is some |
| 884 | * software out there that uses it. |
DRC | e2dd3e3 | 2014-11-25 09:48:15 +0000 | [diff] [blame] | 885 | */ |
| 886 | |
| 887 | #define JPP(arglist) arglist |
| 888 | |
| 889 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 890 | /* Default error-management setup */ |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 891 | EXTERN(struct jpeg_error_mgr *) jpeg_std_error (struct jpeg_error_mgr * err); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 892 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 893 | /* Initialization of JPEG compression objects. |
| 894 | * jpeg_create_compress() and jpeg_create_decompress() are the exported |
| 895 | * names that applications should call. These expand to calls on |
| 896 | * jpeg_CreateCompress and jpeg_CreateDecompress with additional information |
| 897 | * passed for version mismatch checking. |
| 898 | * NB: you must set up the error-manager BEFORE calling jpeg_create_xxx. |
| 899 | */ |
| 900 | #define jpeg_create_compress(cinfo) \ |
| 901 | jpeg_CreateCompress((cinfo), JPEG_LIB_VERSION, \ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 902 | (size_t) sizeof(struct jpeg_compress_struct)) |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 903 | #define jpeg_create_decompress(cinfo) \ |
| 904 | jpeg_CreateDecompress((cinfo), JPEG_LIB_VERSION, \ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 905 | (size_t) sizeof(struct jpeg_decompress_struct)) |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 906 | EXTERN(void) jpeg_CreateCompress (j_compress_ptr cinfo, int version, |
| 907 | size_t structsize); |
| 908 | EXTERN(void) jpeg_CreateDecompress (j_decompress_ptr cinfo, int version, |
| 909 | size_t structsize); |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 910 | /* Destruction of JPEG compression objects */ |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 911 | EXTERN(void) jpeg_destroy_compress (j_compress_ptr cinfo); |
| 912 | EXTERN(void) jpeg_destroy_decompress (j_decompress_ptr cinfo); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 913 | |
| 914 | /* Standard data source and destination managers: stdio streams. */ |
| 915 | /* Caller is responsible for opening the file before and closing after. */ |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 916 | EXTERN(void) jpeg_stdio_dest (j_compress_ptr cinfo, FILE * outfile); |
| 917 | EXTERN(void) jpeg_stdio_src (j_decompress_ptr cinfo, FILE * infile); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 918 | |
DRC | ab70623 | 2013-01-18 23:42:31 +0000 | [diff] [blame] | 919 | #if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED) |
Guido Vollbeding | 989630f | 2010-01-10 00:00:00 +0000 | [diff] [blame] | 920 | /* Data source and destination managers: memory buffers. */ |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 921 | EXTERN(void) jpeg_mem_dest (j_compress_ptr cinfo, unsigned char ** outbuffer, |
| 922 | unsigned long * outsize); |
Kornel Lesiński | 7222ec2 | 2015-01-08 00:53:31 +0000 | [diff] [blame] | 923 | EXTERN(void) jpeg_mem_src (j_decompress_ptr cinfo, |
| 924 | const unsigned char * inbuffer, |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 925 | unsigned long insize); |
DRC | 36a6eec | 2010-10-08 08:05:44 +0000 | [diff] [blame] | 926 | #endif |
Guido Vollbeding | 989630f | 2010-01-10 00:00:00 +0000 | [diff] [blame] | 927 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 928 | /* Default parameter setup for compression */ |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 929 | EXTERN(void) jpeg_set_defaults (j_compress_ptr cinfo); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 930 | /* Compression parameter setup aids */ |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 931 | EXTERN(void) jpeg_set_colorspace (j_compress_ptr cinfo, |
| 932 | J_COLOR_SPACE colorspace); |
| 933 | EXTERN(void) jpeg_default_colorspace (j_compress_ptr cinfo); |
| 934 | EXTERN(void) jpeg_set_quality (j_compress_ptr cinfo, int quality, |
| 935 | boolean force_baseline); |
| 936 | EXTERN(void) jpeg_set_linear_quality (j_compress_ptr cinfo, int scale_factor, |
| 937 | boolean force_baseline); |
DRC | 36a6eec | 2010-10-08 08:05:44 +0000 | [diff] [blame] | 938 | #if JPEG_LIB_VERSION >= 70 |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 939 | EXTERN(void) jpeg_default_qtables (j_compress_ptr cinfo, |
| 940 | boolean force_baseline); |
DRC | 36a6eec | 2010-10-08 08:05:44 +0000 | [diff] [blame] | 941 | #endif |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 942 | EXTERN(void) jpeg_add_quant_table (j_compress_ptr cinfo, int which_tbl, |
| 943 | const unsigned int *basic_table, |
| 944 | int scale_factor, boolean force_baseline); |
| 945 | EXTERN(int) jpeg_quality_scaling (int quality); |
| 946 | EXTERN(void) jpeg_simple_progression (j_compress_ptr cinfo); |
| 947 | EXTERN(void) jpeg_suppress_tables (j_compress_ptr cinfo, boolean suppress); |
| 948 | EXTERN(JQUANT_TBL *) jpeg_alloc_quant_table (j_common_ptr cinfo); |
| 949 | EXTERN(JHUFF_TBL *) jpeg_alloc_huff_table (j_common_ptr cinfo); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 950 | |
| 951 | /* Main entry points for compression */ |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 952 | EXTERN(void) jpeg_start_compress (j_compress_ptr cinfo, |
| 953 | boolean write_all_tables); |
| 954 | EXTERN(JDIMENSION) jpeg_write_scanlines (j_compress_ptr cinfo, |
| 955 | JSAMPARRAY scanlines, |
| 956 | JDIMENSION num_lines); |
| 957 | EXTERN(void) jpeg_finish_compress (j_compress_ptr cinfo); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 958 | |
DRC | 36a6eec | 2010-10-08 08:05:44 +0000 | [diff] [blame] | 959 | #if JPEG_LIB_VERSION >= 70 |
Guido Vollbeding | 5996a25 | 2009-06-27 00:00:00 +0000 | [diff] [blame] | 960 | /* Precalculate JPEG dimensions for current compression parameters. */ |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 961 | EXTERN(void) jpeg_calc_jpeg_dimensions (j_compress_ptr cinfo); |
DRC | 36a6eec | 2010-10-08 08:05:44 +0000 | [diff] [blame] | 962 | #endif |
Guido Vollbeding | 5996a25 | 2009-06-27 00:00:00 +0000 | [diff] [blame] | 963 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 964 | /* Replaces jpeg_write_scanlines when writing raw downsampled data. */ |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 965 | EXTERN(JDIMENSION) jpeg_write_raw_data (j_compress_ptr cinfo, JSAMPIMAGE data, |
| 966 | JDIMENSION num_lines); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 967 | |
Guido Vollbeding | 5996a25 | 2009-06-27 00:00:00 +0000 | [diff] [blame] | 968 | /* Write a special marker. See libjpeg.txt concerning safe usage. */ |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 969 | EXTERN(void) jpeg_write_marker (j_compress_ptr cinfo, int marker, |
| 970 | const JOCTET * dataptr, unsigned int datalen); |
Thomas G. Lane | 5ead57a | 1998-03-27 00:00:00 +0000 | [diff] [blame] | 971 | /* Same, but piecemeal. */ |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 972 | EXTERN(void) jpeg_write_m_header (j_compress_ptr cinfo, int marker, |
| 973 | unsigned int datalen); |
| 974 | EXTERN(void) jpeg_write_m_byte (j_compress_ptr cinfo, int val); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 975 | |
| 976 | /* Alternate compression function: just write an abbreviated table file */ |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 977 | EXTERN(void) jpeg_write_tables (j_compress_ptr cinfo); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 978 | |
| 979 | /* Decompression startup: read start of JPEG datastream to see what's there */ |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 980 | EXTERN(int) jpeg_read_header (j_decompress_ptr cinfo, boolean require_image); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 981 | /* Return value is one of: */ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 982 | #define JPEG_SUSPENDED 0 /* Suspended due to lack of input data */ |
| 983 | #define JPEG_HEADER_OK 1 /* Found valid image datastream */ |
| 984 | #define JPEG_HEADER_TABLES_ONLY 2 /* Found valid table-specs-only datastream */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 985 | /* If you pass require_image = TRUE (normal case), you need not check for |
| 986 | * a TABLES_ONLY return code; an abbreviated file will cause an error exit. |
| 987 | * JPEG_SUSPENDED is only possible if you use a data source module that can |
| 988 | * give a suspension return (the stdio source module doesn't). |
| 989 | */ |
| 990 | |
| 991 | /* Main entry points for decompression */ |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 992 | EXTERN(boolean) jpeg_start_decompress (j_decompress_ptr cinfo); |
| 993 | EXTERN(JDIMENSION) jpeg_read_scanlines (j_decompress_ptr cinfo, |
| 994 | JSAMPARRAY scanlines, |
| 995 | JDIMENSION max_lines); |
DRC | eb32cc1 | 2015-06-25 03:44:36 +0000 | [diff] [blame] | 996 | EXTERN(JDIMENSION) jpeg_skip_scanlines (j_decompress_ptr cinfo, |
| 997 | JDIMENSION num_lines); |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 998 | EXTERN(boolean) jpeg_finish_decompress (j_decompress_ptr cinfo); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 999 | |
| 1000 | /* Replaces jpeg_read_scanlines when reading raw downsampled data. */ |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 1001 | EXTERN(JDIMENSION) jpeg_read_raw_data (j_decompress_ptr cinfo, JSAMPIMAGE data, |
| 1002 | JDIMENSION max_lines); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 1003 | |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 1004 | /* Additional entry points for buffered-image mode. */ |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 1005 | EXTERN(boolean) jpeg_has_multiple_scans (j_decompress_ptr cinfo); |
| 1006 | EXTERN(boolean) jpeg_start_output (j_decompress_ptr cinfo, int scan_number); |
| 1007 | EXTERN(boolean) jpeg_finish_output (j_decompress_ptr cinfo); |
| 1008 | EXTERN(boolean) jpeg_input_complete (j_decompress_ptr cinfo); |
| 1009 | EXTERN(void) jpeg_new_colormap (j_decompress_ptr cinfo); |
| 1010 | EXTERN(int) jpeg_consume_input (j_decompress_ptr cinfo); |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 1011 | /* Return value is one of: */ |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 1012 | /* #define JPEG_SUSPENDED 0 Suspended due to lack of input data */ |
| 1013 | #define JPEG_REACHED_SOS 1 /* Reached start of new scan */ |
| 1014 | #define JPEG_REACHED_EOI 2 /* Reached end of image */ |
| 1015 | #define JPEG_ROW_COMPLETED 3 /* Completed one iMCU row */ |
| 1016 | #define JPEG_SCAN_COMPLETED 4 /* Completed last iMCU row of a scan */ |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 1017 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 1018 | /* Precalculate output dimensions for current decompression parameters. */ |
DRC | 36a6eec | 2010-10-08 08:05:44 +0000 | [diff] [blame] | 1019 | #if JPEG_LIB_VERSION >= 80 |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 1020 | EXTERN(void) jpeg_core_output_dimensions (j_decompress_ptr cinfo); |
DRC | 36a6eec | 2010-10-08 08:05:44 +0000 | [diff] [blame] | 1021 | #endif |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 1022 | EXTERN(void) jpeg_calc_output_dimensions (j_decompress_ptr cinfo); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 1023 | |
Thomas G. Lane | 5ead57a | 1998-03-27 00:00:00 +0000 | [diff] [blame] | 1024 | /* Control saving of COM and APPn markers into marker_list. */ |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 1025 | EXTERN(void) jpeg_save_markers (j_decompress_ptr cinfo, int marker_code, |
| 1026 | unsigned int length_limit); |
Thomas G. Lane | 5ead57a | 1998-03-27 00:00:00 +0000 | [diff] [blame] | 1027 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 1028 | /* Install a special processing method for COM or APPn markers. */ |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 1029 | EXTERN(void) jpeg_set_marker_processor (j_decompress_ptr cinfo, |
| 1030 | int marker_code, |
| 1031 | jpeg_marker_parser_method routine); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 1032 | |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 1033 | /* Read or write raw DCT coefficients --- useful for lossless transcoding. */ |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 1034 | EXTERN(jvirt_barray_ptr *) jpeg_read_coefficients (j_decompress_ptr cinfo); |
| 1035 | EXTERN(void) jpeg_write_coefficients (j_compress_ptr cinfo, |
| 1036 | jvirt_barray_ptr * coef_arrays); |
| 1037 | EXTERN(void) jpeg_copy_critical_parameters (j_decompress_ptr srcinfo, |
| 1038 | j_compress_ptr dstinfo); |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 1039 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 1040 | /* If you choose to abort compression or decompression before completing |
| 1041 | * jpeg_finish_(de)compress, then you need to clean up to release memory, |
| 1042 | * temporary files, etc. You can just call jpeg_destroy_(de)compress |
| 1043 | * if you're done with the JPEG object, but if you want to clean it up and |
| 1044 | * reuse it, call this: |
| 1045 | */ |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 1046 | EXTERN(void) jpeg_abort_compress (j_compress_ptr cinfo); |
| 1047 | EXTERN(void) jpeg_abort_decompress (j_decompress_ptr cinfo); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 1048 | |
| 1049 | /* Generic versions of jpeg_abort and jpeg_destroy that work on either |
| 1050 | * flavor of JPEG object. These may be more convenient in some places. |
| 1051 | */ |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 1052 | EXTERN(void) jpeg_abort (j_common_ptr cinfo); |
| 1053 | EXTERN(void) jpeg_destroy (j_common_ptr cinfo); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 1054 | |
| 1055 | /* Default restart-marker-resync procedure for use by data source modules */ |
DRC | bc56b75 | 2014-05-16 10:43:44 +0000 | [diff] [blame] | 1056 | EXTERN(boolean) jpeg_resync_to_restart (j_decompress_ptr cinfo, int desired); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 1057 | |
| 1058 | |
| 1059 | /* These marker codes are exported since applications and data source modules |
| 1060 | * are likely to want to use them. |
| 1061 | */ |
| 1062 | |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 1063 | #define JPEG_RST0 0xD0 /* RST0 marker code */ |
| 1064 | #define JPEG_EOI 0xD9 /* EOI marker code */ |
| 1065 | #define JPEG_APP0 0xE0 /* APP0 marker code */ |
| 1066 | #define JPEG_COM 0xFE /* COM marker code */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 1067 | |
| 1068 | |
| 1069 | /* If we have a brain-damaged compiler that emits warnings (or worse, errors) |
| 1070 | * for structure definitions that are never filled in, keep it quiet by |
| 1071 | * supplying dummy definitions for the various substructures. |
| 1072 | */ |
| 1073 | |
| 1074 | #ifdef INCOMPLETE_TYPES_BROKEN |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 1075 | #ifndef JPEG_INTERNALS /* will be defined in jpegint.h */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 1076 | struct jvirt_sarray_control { long dummy; }; |
| 1077 | struct jvirt_barray_control { long dummy; }; |
| 1078 | struct jpeg_comp_master { long dummy; }; |
| 1079 | struct jpeg_c_main_controller { long dummy; }; |
| 1080 | struct jpeg_c_prep_controller { long dummy; }; |
| 1081 | struct jpeg_c_coef_controller { long dummy; }; |
| 1082 | struct jpeg_marker_writer { long dummy; }; |
| 1083 | struct jpeg_color_converter { long dummy; }; |
| 1084 | struct jpeg_downsampler { long dummy; }; |
| 1085 | struct jpeg_forward_dct { long dummy; }; |
| 1086 | struct jpeg_entropy_encoder { long dummy; }; |
| 1087 | struct jpeg_decomp_master { long dummy; }; |
| 1088 | struct jpeg_d_main_controller { long dummy; }; |
| 1089 | struct jpeg_d_coef_controller { long dummy; }; |
| 1090 | struct jpeg_d_post_controller { long dummy; }; |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 1091 | struct jpeg_input_controller { long dummy; }; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 1092 | struct jpeg_marker_reader { long dummy; }; |
| 1093 | struct jpeg_entropy_decoder { long dummy; }; |
| 1094 | struct jpeg_inverse_dct { long dummy; }; |
| 1095 | struct jpeg_upsampler { long dummy; }; |
| 1096 | struct jpeg_color_deconverter { long dummy; }; |
| 1097 | struct jpeg_color_quantizer { long dummy; }; |
| 1098 | #endif /* JPEG_INTERNALS */ |
| 1099 | #endif /* INCOMPLETE_TYPES_BROKEN */ |
| 1100 | |
| 1101 | |
| 1102 | /* |
| 1103 | * The JPEG library modules define JPEG_INTERNALS before including this file. |
| 1104 | * The internal structure declarations are read only when that is true. |
| 1105 | * Applications using the library should not include jpegint.h, but may wish |
| 1106 | * to include jerror.h. |
| 1107 | */ |
| 1108 | |
| 1109 | #ifdef JPEG_INTERNALS |
DRC | b775351 | 2014-05-11 09:36:25 +0000 | [diff] [blame] | 1110 | #include "jpegint.h" /* fetch private declarations */ |
| 1111 | #include "jerror.h" /* fetch error codes too */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 1112 | #endif |
Thomas G. Lane | 9ba2f5e | 1994-12-07 00:00:00 +0000 | [diff] [blame] | 1113 | |
DRC | ca3cebb | 2010-02-23 08:12:38 +0000 | [diff] [blame] | 1114 | #ifdef __cplusplus |
Guido Vollbeding | 5996a25 | 2009-06-27 00:00:00 +0000 | [diff] [blame] | 1115 | #ifndef DONT_USE_EXTERN_C |
DRC | ca3cebb | 2010-02-23 08:12:38 +0000 | [diff] [blame] | 1116 | } |
| 1117 | #endif |
Guido Vollbeding | 5996a25 | 2009-06-27 00:00:00 +0000 | [diff] [blame] | 1118 | #endif |
DRC | ca3cebb | 2010-02-23 08:12:38 +0000 | [diff] [blame] | 1119 | |
Thomas G. Lane | 9ba2f5e | 1994-12-07 00:00:00 +0000 | [diff] [blame] | 1120 | #endif /* JPEGLIB_H */ |