217 lines
8.3 KiB
Plaintext
217 lines
8.3 KiB
Plaintext
IJG JPEG LIBRARY: FILE LIST
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Copyright (C) 1994-2017, Thomas G. Lane, Guido Vollbeding.
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This file is part of the Independent JPEG Group's software.
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For conditions of distribution and use, see the accompanying README file.
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Here is a road map to the files in the IJG JPEG distribution. The
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distribution includes the JPEG library proper, plus two application
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programs ("cjpeg" and "djpeg") which use the library to convert JPEG
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files to and from some other popular image formats. A third application
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"jpegtran" uses the library to do lossless conversion between different
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variants of JPEG. There are also two stand-alone applications,
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"rdjpgcom" and "wrjpgcom".
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THE JPEG LIBRARY
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================
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Include files:
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jpeglib.h JPEG library's exported data and function declarations.
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jconfig.h Configuration declarations. Note: this file is not present
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in the distribution; it is generated during installation.
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jmorecfg.h Additional configuration declarations; need not be changed
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for a standard installation.
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jerror.h Declares JPEG library's error and trace message codes.
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jinclude.h Central include file used by all IJG .c files to reference
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system include files.
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jpegint.h JPEG library's internal data structures.
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jdct.h Private declarations for forward & reverse DCT subsystems.
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jmemsys.h Private declarations for memory management subsystem.
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jversion.h Version information.
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Applications using the library should include jpeglib.h (which in turn
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includes jconfig.h and jmorecfg.h). Optionally, jerror.h may be included
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if the application needs to reference individual JPEG error codes. The
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other include files are intended for internal use and would not normally
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be included by an application program. (cjpeg/djpeg/etc do use jinclude.h,
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since its function is to improve portability of the whole IJG distribution.
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Most other applications will directly include the system include files they
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want, and hence won't need jinclude.h.)
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C source code files:
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These files contain most of the functions intended to be called directly by
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an application program:
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jcapimin.c Application program interface: core routines for compression.
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jcapistd.c Application program interface: standard compression.
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jdapimin.c Application program interface: core routines for decompression.
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jdapistd.c Application program interface: standard decompression.
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jcomapi.c Application program interface routines common to compression
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and decompression.
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jcparam.c Compression parameter setting helper routines.
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jctrans.c API and library routines for transcoding compression.
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jdtrans.c API and library routines for transcoding decompression.
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Compression side of the library:
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jcinit.c Initialization: determines which other modules to use.
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jcmaster.c Master control: setup and inter-pass sequencing logic.
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jcmainct.c Main buffer controller (preprocessor => JPEG compressor).
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jcprepct.c Preprocessor buffer controller.
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jccoefct.c Buffer controller for DCT coefficient buffer.
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jccolor.c Color space conversion.
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jcsample.c Downsampling.
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jcdctmgr.c DCT manager (DCT implementation selection & control).
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jfdctint.c Forward DCT using slow-but-accurate integer method.
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jfdctfst.c Forward DCT using faster, less accurate integer method.
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jfdctflt.c Forward DCT using floating-point arithmetic.
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jchuff.c Huffman entropy coding.
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jcarith.c Arithmetic entropy coding.
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jcmarker.c JPEG marker writing.
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jdatadst.c Data destination managers for memory and stdio output.
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Decompression side of the library:
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jdmaster.c Master control: determines which other modules to use.
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jdinput.c Input controller: controls input processing modules.
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jdmainct.c Main buffer controller (JPEG decompressor => postprocessor).
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jdcoefct.c Buffer controller for DCT coefficient buffer.
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jdpostct.c Postprocessor buffer controller.
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jdmarker.c JPEG marker reading.
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jdhuff.c Huffman entropy decoding.
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jdarith.c Arithmetic entropy decoding.
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jddctmgr.c IDCT manager (IDCT implementation selection & control).
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jidctint.c Inverse DCT using slow-but-accurate integer method.
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jidctfst.c Inverse DCT using faster, less accurate integer method.
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jidctflt.c Inverse DCT using floating-point arithmetic.
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jdsample.c Upsampling.
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jdcolor.c Color space conversion.
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jdmerge.c Merged upsampling/color conversion (faster, lower quality).
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jquant1.c One-pass color quantization using a fixed-spacing colormap.
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jquant2.c Two-pass color quantization using a custom-generated colormap.
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Also handles one-pass quantization to an externally given map.
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jdatasrc.c Data source managers for memory and stdio input.
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Support files for both compression and decompression:
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jaricom.c Tables for common use in arithmetic entropy encoding and
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decoding routines.
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jerror.c Standard error handling routines (application replaceable).
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jmemmgr.c System-independent (more or less) memory management code.
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jutils.c Miscellaneous utility routines.
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jmemmgr.c relies on a system-dependent memory management module. The IJG
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distribution includes the following implementations of the system-dependent
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module:
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jmemnobs.c "No backing store": assumes adequate virtual memory exists.
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jmemansi.c Makes temporary files with ANSI-standard routine tmpfile().
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jmemname.c Makes temporary files with program-generated file names.
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jmemdos.c Custom implementation for MS-DOS (16-bit environment only):
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can use extended and expanded memory as well as temp files.
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jmemmac.c Custom implementation for Apple Macintosh.
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Exactly one of the system-dependent modules should be configured into an
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installed JPEG library (see install.txt for hints about which one to use).
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On unusual systems you may find it worthwhile to make a special
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system-dependent memory manager.
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Non-C source code files:
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jmemdosa.asm 80x86 assembly code support for jmemdos.c; used only in
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MS-DOS-specific configurations of the JPEG library.
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CJPEG/DJPEG/JPEGTRAN
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====================
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Include files:
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cdjpeg.h Declarations shared by cjpeg/djpeg/jpegtran modules.
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cderror.h Additional error and trace message codes for cjpeg et al.
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transupp.h Declarations for jpegtran support routines in transupp.c.
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C source code files:
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cjpeg.c Main program for cjpeg.
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djpeg.c Main program for djpeg.
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jpegtran.c Main program for jpegtran.
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cdjpeg.c Utility routines used by all three programs.
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rdcolmap.c Code to read a colormap file for djpeg's "-map" switch.
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rdswitch.c Code to process some of cjpeg's more complex switches.
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Also used by jpegtran.
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transupp.c Support code for jpegtran: lossless image manipulations.
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Image file reader modules for cjpeg:
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rdbmp.c BMP file input.
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rdgif.c GIF file input (now just a stub).
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rdppm.c PPM/PGM file input.
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rdrle.c Utah RLE file input.
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rdtarga.c Targa file input.
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Image file writer modules for djpeg:
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wrbmp.c BMP file output.
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wrgif.c GIF file output (a mere shadow of its former self).
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wrppm.c PPM/PGM file output.
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wrrle.c Utah RLE file output.
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wrtarga.c Targa file output.
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RDJPGCOM/WRJPGCOM
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=================
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C source code files:
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rdjpgcom.c Stand-alone rdjpgcom application.
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wrjpgcom.c Stand-alone wrjpgcom application.
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These programs do not depend on the IJG library. They do use
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jconfig.h and jinclude.h, only to improve portability.
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ADDITIONAL FILES
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================
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Documentation (see README for a guide to the documentation files):
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README Master documentation file.
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*.txt Other documentation files.
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*.1 Documentation in Unix man page format.
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change.log Version-to-version change highlights.
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example.c Sample code for calling JPEG library.
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Configuration/installation files and programs (see install.txt for more info):
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configure Unix shell script to perform automatic configuration.
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configure.ac Source file for use with Autoconf to generate configure.
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ltmain.sh Support scripts for configure (from GNU libtool).
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config.guess
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config.sub
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depcomp
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missing
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ar-lib
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compile
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install-sh Install shell script for those Unix systems lacking one.
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Makefile.in Makefile input for configure.
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Makefile.am Source file for use with Automake to generate Makefile.in.
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ckconfig.c Program to generate jconfig.h on non-Unix systems.
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jconfig.txt Template for making jconfig.h by hand.
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mak*.* Sample makefiles for particular systems.
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jconfig.* Sample jconfig.h for particular systems.
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libjpeg.map Script to generate shared library with versioned symbols.
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libjpeg.pc.in libjpeg.pc pkg-config file input for configure.
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aclocal.m4 M4 macro definitions for use with Autoconf.
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Test files (see install.txt for test procedure):
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test*.* Source and comparison files for confidence test.
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These are binary image files, NOT text files.
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