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ˆÃÊ 0ÉÄÇ $ ˆl–äY>”ji?u@3q·.õ1hßË „lx?ÊÅÈ ?÷ /* * jpeglib.h * * This file was part of the Independent JPEG Group's software: * Copyright (C) 1991-1998, Thomas G. Lane. * Modified 2002-2009 by Guido Vollbeding. * libjpeg-turbo Modifications: * Copyright (C) 2009-2011, 2013-2014, 2016-2017, 2020, D. R. Commander. * Copyright (C) 2015, Google, Inc. * For conditions of distribution and use, see the accompanying README.ijg * file. * * This file defines the application interface for the JPEG library. * Most applications using the library need only include this file, * and perhaps jerror.h if they want to know the exact error codes. */ #ifndef JPEGLIB_H #define JPEGLIB_H /* * First we include the configuration files that record how this * installation of the JPEG library is set up. jconfig.h can be * generated automatically for many systems. jmorecfg.h contains * manual configuration options that most people need not worry about. */ #ifndef JCONFIG_INCLUDED /* in case jinclude.h already did */ #include "jconfig.h" /* widely used configuration options */ #endif #include "jmorecfg.h" /* seldom changed options */ #ifdef __cplusplus #ifndef DONT_USE_EXTERN_C extern "C" { #endif #endif /* Various constants determining the sizes of things. * All of these are specified by the JPEG standard, so don't change them * if you want to be compatible. */ #define DCTSIZE 8 /* The basic DCT block is 8x8 samples */ #define DCTSIZE2 64 /* DCTSIZE squared; # of elements in a block */ #define NUM_QUANT_TBLS 4 /* Quantization tables are numbered 0..3 */ #define NUM_HUFF_TBLS 4 /* Huffman tables are numbered 0..3 */ #define NUM_ARITH_TBLS 16 /* Arith-coding tables are numbered 0..15 */ #define MAX_COMPS_IN_SCAN 4 /* JPEG limit on # of components in one scan */ #define MAX_SAMP_FACTOR 4 /* JPEG limit on sampling factors */ /* Unfortunately, some bozo at Adobe saw no reason to be bound by the standard; * the PostScript DCT filter can emit files with many more than 10 blocks/MCU. * If you happen to run across such a file, you can up D_MAX_BLOCKS_IN_MCU * to handle it. We even let you do this from the jconfig.h file. However, * we strongly discourage changing C_MAX_BLOCKS_IN_MCU; just because Adobe * sometimes emits noncompliant files doesn't mean you should too. */ #define C_MAX_BLOCKS_IN_MCU 10 /* compressor's limit on blocks per MCU */ #ifndef D_MAX_BLOCKS_IN_MCU #define D_MAX_BLOCKS_IN_MCU 10 /* decompressor's limit on blocks per MCU */ #endif /* Data structures for images (arrays of samples and of DCT coefficients). */ typedef JSAMPLE *JSAMPROW; /* ptr to one image row of pixel samples. */ typedef JSAMPROW *JSAMPARRAY; /* ptr to some rows (a 2-D sample array) */ typedef JSAMPARRAY *JSAMPIMAGE; /* a 3-D sample array: top index is color */ typedef JCOEF JBLOCK[DCTSIZE2]; /* one block of coefficients */ typedef JBLOCK *JBLOCKROW; /* pointer to one row of coefficient blocks */ typedef JBLOCKROW *JBLOCKARRAY; /* a 2-D array of coefficient blocks */ typedef JBLOCKARRAY *JBLOCKIMAGE; /* a 3-D array of coefficient blocks */ typedef JCOEF *JCOEFPTR; /* useful in a couple of places */ /* Types for JPEG compression parameters and working tables. */ /* DCT coefficient quantization tables. */ typedef struct { /* This array gives the coefficient quantizers in natural array order * (not the zigzag order in which they are stored in a JPEG DQT marker). * CAUTION: IJG versions prior to v6a kept this array in zigzag order. */ UINT16 quantval[DCTSIZE2];