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The Independent JPEG Group's JPEG software v8

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This commit is contained in:
Guido Vollbeding 2010-01-10 00:00:00 +00:00 committed by DRC
parent 5996a25e2f
commit 989630f70c
41 changed files with 3910 additions and 5168 deletions
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3
Makefile.in
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@ -1,4 +1,4 @@
# Makefile.in generated by automake 1.11 from Makefile.am.
# Makefile.in generated by automake 1.11.1 from Makefile.am.
# @configure_input@
# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
@ -218,6 +218,7 @@ PACKAGE_BUGREPORT = @PACKAGE_BUGREPORT@
PACKAGE_NAME = @PACKAGE_NAME@
PACKAGE_STRING = @PACKAGE_STRING@
PACKAGE_TARNAME = @PACKAGE_TARNAME@
PACKAGE_URL = @PACKAGE_URL@
PACKAGE_VERSION = @PACKAGE_VERSION@
PATH_SEPARATOR = @PATH_SEPARATOR@
RANLIB = @RANLIB@

51
README
View File

@ -1,10 +1,10 @@
The Independent JPEG Group's JPEG software
==========================================
README for release 7 of 27-Jun-2009
README for release 8 of 10-Jan-2010
===================================
This distribution contains the seventh public release of the Independent JPEG
This distribution contains the eighth public release of the Independent JPEG
Group's free JPEG software. You are welcome to redistribute this software and
to use it for any purpose, subject to the conditions under LEGAL ISSUES, below.
@ -114,7 +114,7 @@ with respect to this software, its quality, accuracy, merchantability, or
fitness for a particular purpose. This software is provided "AS IS", and you,
its user, assume the entire risk as to its quality and accuracy.
This software is copyright (C) 1991-2009, Thomas G. Lane, Guido Vollbeding.
This software is copyright (C) 1991-2010, Thomas G. Lane, Guido Vollbeding.
All Rights Reserved except as specified below.
Permission is hereby granted to use, copy, modify, and distribute this
@ -221,16 +221,18 @@ Part 1: Requirements and guidelines" and has document numbers ISO/IEC IS
10918-1, ITU-T T.81. Part 2 is titled "Digital Compression and Coding of
Continuous-tone Still Images, Part 2: Compliance testing" and has document
numbers ISO/IEC IS 10918-2, ITU-T T.83.
IJG JPEG 8 introduces an implementation of the JPEG SmartScale extension
which is specified in a contributed document at ITU and ISO with title "ITU-T
JPEG-Plus Proposal for Extending ITU-T T.81 for Advanced Image Coding", April
2006, Geneva, Switzerland. The latest version of the document is Revision 3.
The JPEG standard does not specify all details of an interchangeable file
format. For the omitted details we follow the "JFIF" conventions, revision
1.02. A copy of the JFIF spec is available from:
Literature Department
C-Cube Microsystems, Inc.
1778 McCarthy Blvd.
Milpitas, CA 95035
phone (408) 944-6300, fax (408) 944-6314
A PostScript version of this document is available at
1.02. JFIF 1.02 has been adopted as an Ecma International Technical Report
and thus received a formal publication status. It is available as a free
download in PDF format from
http://www.ecma-international.org/publications/techreports/E-TR-098.htm.
A PostScript version of the JFIF document is available at
http://www.ijg.org/files/jfif.ps.gz. There is also a plain text version at
http://www.ijg.org/files/jfif.txt.gz, but it is missing the figures.
@ -252,8 +254,8 @@ ARCHIVE LOCATIONS
The "official" archive site for this software is www.ijg.org.
The most recent released version can always be found there in
directory "files". This particular version will be archived as
http://www.ijg.org/files/jpegsrc.v7.tar.gz, and in Windows-compatible
"zip" archive format as http://www.ijg.org/files/jpegsr7.zip.
http://www.ijg.org/files/jpegsrc.v8.tar.gz, and in Windows-compatible
"zip" archive format as http://www.ijg.org/files/jpegsr8.zip.
The JPEG FAQ (Frequently Asked Questions) article is a source of some
general information about JPEG.
@ -269,9 +271,8 @@ with body
ACKNOWLEDGMENTS
===============
Thank to Juergen Bruder of the Georg-Cantor-Organization at the
Martin-Luther-University Halle for providing me with a copy of the common
DCT algorithm article, only to find out that I had come to the same result
Thank to Juergen Bruder for providing me with a copy of the common DCT
algorithm article, only to find out that I had come to the same result
in a more direct and comprehensible way with a more generative approach.
Thank to Istvan Sebestyen and Joan L. Mitchell for inviting me to the
@ -283,8 +284,8 @@ Joint Video Team (MPEG & ITU) meeting in Geneva, Switzerland.
Thank to John Korejwa and Massimo Ballerini for inviting me to
fruitful consultations in Boston, MA and Milan, Italy.
Thank to Hendrik Elstner, Roland Fassauer, and Simone Zuck for
corresponding business development.
Thank to Hendrik Elstner, Roland Fassauer, Simone Zuck, Guenther
Maier-Gerber, and Walter Stoeber for corresponding business development.
Thank to Nico Zschach and Dirk Stelling of the technical support team
at the Digital Images company in Halle for providing me with extra
@ -293,6 +294,8 @@ equipment for configuration tests.
Thank to Richard F. Lyon (then of Foveon Inc.) for fruitful
communication about JPEG configuration in Sigma Photo Pro software.
Thank to Andrew Finkenstadt for hosting the ijg.org site.
Last but not least special thank to Thomas G. Lane for the original
design and development of this singular software package.
@ -301,9 +304,9 @@ FILE FORMAT WARS
================
The ISO JPEG standards committee actually promotes different formats like
JPEG-2000 or JPEG-XR which are incompatible with original DCT-based JPEG
and which are based on faulty technologies. IJG therefore does not and
will not support such momentary mistakes (see REFERENCES).
"JPEG 2000" or "JPEG XR" which are incompatible with original DCT-based
JPEG and which are based on faulty technologies. IJG therefore does not
and will not support such momentary mistakes (see REFERENCES).
We have little or no sympathy for the promotion of these formats. Indeed,
one of the original reasons for developing this free software was to help
force convergence on common, interoperable format standards for JPEG files.
@ -315,8 +318,8 @@ image files indefinitely.)
TO DO
=====
v7 is basically just a necessary interim release, paving the way for a
major breakthrough in image coding technology with the next v8 package
which is scheduled for release in the year 2010.
Version 8.0 is the first release of a new generation JPEG standard
to overcome the limitations of the original JPEG specification.
More features are being prepared for coming releases...
Please send bug reports, offers of help, etc. to jpeg-info@jpegclub.org.
Please send bug reports, offers of help, etc. to jpeg-info@uc.ag.

20
aclocal.m4 vendored
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@ -1,4 +1,4 @@
# generated automatically by aclocal 1.11 -*- Autoconf -*-
# generated automatically by aclocal 1.11.1 -*- Autoconf -*-
# Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
# 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
@ -13,8 +13,8 @@
m4_ifndef([AC_AUTOCONF_VERSION],
[m4_copy([m4_PACKAGE_VERSION], [AC_AUTOCONF_VERSION])])dnl
m4_if(m4_defn([AC_AUTOCONF_VERSION]), [2.63],,
[m4_warning([this file was generated for autoconf 2.63.
m4_if(m4_defn([AC_AUTOCONF_VERSION]), [2.65],,
[m4_warning([this file was generated for autoconf 2.65.
You have another version of autoconf. It may work, but is not guaranteed to.
If you have problems, you may need to regenerate the build system entirely.
To do so, use the procedure documented by the package, typically `autoreconf'.])])
@ -7859,15 +7859,15 @@ m4_define([lt_dict_filter],
# Generated from ltversion.in.
# serial 3012 ltversion.m4
# serial 3017 ltversion.m4
# This file is part of GNU Libtool
m4_define([LT_PACKAGE_VERSION], [2.2.6])
m4_define([LT_PACKAGE_REVISION], [1.3012])
m4_define([LT_PACKAGE_VERSION], [2.2.6b])
m4_define([LT_PACKAGE_REVISION], [1.3017])
AC_DEFUN([LTVERSION_VERSION],
[macro_version='2.2.6'
macro_revision='1.3012'
[macro_version='2.2.6b'
macro_revision='1.3017'
_LT_DECL(, macro_version, 0, [Which release of libtool.m4 was used?])
_LT_DECL(, macro_revision, 0)
])
@ -7980,7 +7980,7 @@ AC_DEFUN([AM_AUTOMAKE_VERSION],
[am__api_version='1.11'
dnl Some users find AM_AUTOMAKE_VERSION and mistake it for a way to
dnl require some minimum version. Point them to the right macro.
m4_if([$1], [1.11], [],
m4_if([$1], [1.11.1], [],
[AC_FATAL([Do not call $0, use AM_INIT_AUTOMAKE([$1]).])])dnl
])
@ -7996,7 +7996,7 @@ m4_define([_AM_AUTOCONF_VERSION], [])
# Call AM_AUTOMAKE_VERSION and AM_AUTOMAKE_VERSION so they can be traced.
# This function is AC_REQUIREd by AM_INIT_AUTOMAKE.
AC_DEFUN([AM_SET_CURRENT_AUTOMAKE_VERSION],
[AM_AUTOMAKE_VERSION([1.11])dnl
[AM_AUTOMAKE_VERSION([1.11.1])dnl
m4_ifndef([AC_AUTOCONF_VERSION],
[m4_copy([m4_PACKAGE_VERSION], [AC_AUTOCONF_VERSION])])dnl
_AM_AUTOCONF_VERSION(m4_defn([AC_AUTOCONF_VERSION]))])

2
cderror.h
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@ -2,6 +2,7 @@
* cderror.h
*
* Copyright (C) 1994-1997, Thomas G. Lane.
* Modified 2009 by Guido Vollbeding.
* This file is part of the Independent JPEG Group's software.
* For conditions of distribution and use, see the accompanying README file.
*
@ -45,6 +46,7 @@ JMESSAGE(JERR_BMP_BADHEADER, "Invalid BMP file: bad header length")
JMESSAGE(JERR_BMP_BADPLANES, "Invalid BMP file: biPlanes not equal to 1")
JMESSAGE(JERR_BMP_COLORSPACE, "BMP output must be grayscale or RGB")
JMESSAGE(JERR_BMP_COMPRESSED, "Sorry, compressed BMPs not yet supported")
JMESSAGE(JERR_BMP_EMPTY, "Empty BMP image")
JMESSAGE(JERR_BMP_NOT, "Not a BMP file - does not start with BM")
JMESSAGE(JTRC_BMP, "%ux%u 24-bit BMP image")
JMESSAGE(JTRC_BMP_MAPPED, "%ux%u 8-bit colormapped BMP image")

20
change.log
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@ -1,6 +1,26 @@
CHANGE LOG for Independent JPEG Group's JPEG software
Version 8 10-Jan-2010
----------------------
jpegtran now supports the same -scale option as djpeg for "lossless" resize.
An implementation of the JPEG SmartScale extension is required for this
feature. A (draft) specification of the JPEG SmartScale extension is
available as a contributed document at ITU and ISO. Revision 2 or later
of the document is required (latest document version is Revision 3).
The SmartScale extension will enable more features beside lossless resize
in future implementations, as described in the document (new compression
options).
Add sanity check in BMP reader module to avoid cjpeg crash for empty input
image (thank to Isaev Ildar of ISP RAS, Moscow, RU for reporting this error).
Add data source and destination managers for read from and write to
memory buffers. New API functions jpeg_mem_src and jpeg_mem_dest.
Thank to Roberto Boni from Italy for the suggestion.
Version 7 27-Jun-2009
----------------------

4
cjpeg.1
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@ -1,4 +1,4 @@
.TH CJPEG 1 "10 June 2009"
.TH CJPEG 1 "30 December 2009"
.SH NAME
cjpeg \- compress an image file to a JPEG file
.SH SYNOPSIS
@ -135,7 +135,7 @@ and assigned to components with
.B \-qslots
parameter (see the "wizard" switches below).
.B Caution:
You must explicitely add
You must explicitly add
.BI \-sample " 1x1"
for efficient separate color
quality selection, since the default value used by library is 2x2!

196
config.guess vendored
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@ -1,10 +1,10 @@
#! /bin/sh
# Attempt to guess a canonical system name.
# Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
# 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
# 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
# Free Software Foundation, Inc.
timestamp='2009-04-27'
timestamp='2009-11-20'
# This file is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
@ -27,16 +27,16 @@ timestamp='2009-04-27'
# the same distribution terms that you use for the rest of that program.
# Originally written by Per Bothner <per@bothner.com>.
# Please send patches to <config-patches@gnu.org>. Submit a context
# diff and a properly formatted ChangeLog entry.
# Originally written by Per Bothner. Please send patches (context
# diff format) to <config-patches@gnu.org> and include a ChangeLog
# entry.
#
# This script attempts to guess a canonical system name similar to
# config.sub. If it succeeds, it prints the system name on stdout, and
# exits with 0. Otherwise, it exits with 1.
#
# The plan is that this can be called by configure scripts if you
# don't specify an explicit build system type.
# You can get the latest version of this script from:
# http://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.guess;hb=HEAD
me=`echo "$0" | sed -e 's,.*/,,'`
@ -170,7 +170,7 @@ case "${UNAME_MACHINE}:${UNAME_SYSTEM}:${UNAME_RELEASE}:${UNAME_VERSION}" in
arm*|i386|m68k|ns32k|sh3*|sparc|vax)
eval $set_cc_for_build
if echo __ELF__ | $CC_FOR_BUILD -E - 2>/dev/null \
| grep __ELF__ >/dev/null
| grep -q __ELF__
then
# Once all utilities can be ECOFF (netbsdecoff) or a.out (netbsdaout).
# Return netbsd for either. FIX?
@ -333,6 +333,9 @@ case "${UNAME_MACHINE}:${UNAME_SYSTEM}:${UNAME_RELEASE}:${UNAME_VERSION}" in
sun4*:SunOS:5.*:* | tadpole*:SunOS:5.*:*)
echo sparc-sun-solaris2`echo ${UNAME_RELEASE}|sed -e 's/[^.]*//'`
exit ;;
i86pc:AuroraUX:5.*:* | i86xen:AuroraUX:5.*:*)
echo i386-pc-auroraux${UNAME_RELEASE}
exit ;;
i86pc:SunOS:5.*:* | i86xen:SunOS:5.*:*)
eval $set_cc_for_build
SUN_ARCH="i386"
@ -656,7 +659,7 @@ EOF
# => hppa64-hp-hpux11.23
if echo __LP64__ | (CCOPTS= $CC_FOR_BUILD -E - 2>/dev/null) |
grep __LP64__ >/dev/null
grep -q __LP64__
then
HP_ARCH="hppa2.0w"
else
@ -807,12 +810,12 @@ EOF
i*:PW*:*)
echo ${UNAME_MACHINE}-pc-pw32
exit ;;
*:Interix*:[3456]*)
*:Interix*:*)
case ${UNAME_MACHINE} in
x86)
echo i586-pc-interix${UNAME_RELEASE}
exit ;;
EM64T | authenticamd | genuineintel)
authenticamd | genuineintel | EM64T)
echo x86_64-unknown-interix${UNAME_RELEASE}
exit ;;
IA64)
@ -822,6 +825,9 @@ EOF
[345]86:Windows_95:* | [345]86:Windows_98:* | [345]86:Windows_NT:*)
echo i${UNAME_MACHINE}-pc-mks
exit ;;
8664:Windows_NT:*)
echo x86_64-pc-mks
exit ;;
i*:Windows_NT*:* | Pentium*:Windows_NT*:*)
# How do we know it's Interix rather than the generic POSIX subsystem?
# It also conflicts with pre-2.0 versions of AT&T UWIN. Should we
@ -851,6 +857,20 @@ EOF
i*86:Minix:*:*)
echo ${UNAME_MACHINE}-pc-minix
exit ;;
alpha:Linux:*:*)
case `sed -n '/^cpu model/s/^.*: \(.*\)/\1/p' < /proc/cpuinfo` in
EV5) UNAME_MACHINE=alphaev5 ;;
EV56) UNAME_MACHINE=alphaev56 ;;
PCA56) UNAME_MACHINE=alphapca56 ;;
PCA57) UNAME_MACHINE=alphapca56 ;;
EV6) UNAME_MACHINE=alphaev6 ;;
EV67) UNAME_MACHINE=alphaev67 ;;
EV68*) UNAME_MACHINE=alphaev68 ;;
esac
objdump --private-headers /bin/sh | grep -q ld.so.1
if test "$?" = 0 ; then LIBC="libc1" ; else LIBC="" ; fi
echo ${UNAME_MACHINE}-unknown-linux-gnu${LIBC}
exit ;;
arm*:Linux:*:*)
eval $set_cc_for_build
if echo __ARM_EABI__ | $CC_FOR_BUILD -E - 2>/dev/null \
@ -873,6 +893,17 @@ EOF
frv:Linux:*:*)
echo frv-unknown-linux-gnu
exit ;;
i*86:Linux:*:*)
LIBC=gnu
eval $set_cc_for_build
sed 's/^ //' << EOF >$dummy.c
#ifdef __dietlibc__
LIBC=dietlibc
#endif
EOF
eval `$CC_FOR_BUILD -E $dummy.c 2>/dev/null | grep '^LIBC'`
echo "${UNAME_MACHINE}-pc-linux-${LIBC}"
exit ;;
ia64:Linux:*:*)
echo ${UNAME_MACHINE}-unknown-linux-gnu
exit ;;
@ -882,78 +913,34 @@ EOF
m68*:Linux:*:*)
echo ${UNAME_MACHINE}-unknown-linux-gnu
exit ;;
mips:Linux:*:*)
mips:Linux:*:* | mips64:Linux:*:*)
eval $set_cc_for_build
sed 's/^ //' << EOF >$dummy.c
#undef CPU
#undef mips
#undef mipsel
#undef ${UNAME_MACHINE}
#undef ${UNAME_MACHINE}el
#if defined(__MIPSEL__) || defined(__MIPSEL) || defined(_MIPSEL) || defined(MIPSEL)
CPU=mipsel
CPU=${UNAME_MACHINE}el
#else
#if defined(__MIPSEB__) || defined(__MIPSEB) || defined(_MIPSEB) || defined(MIPSEB)
CPU=mips
CPU=${UNAME_MACHINE}
#else
CPU=
#endif
#endif
EOF
eval "`$CC_FOR_BUILD -E $dummy.c 2>/dev/null | sed -n '
/^CPU/{
s: ::g
p
}'`"
test x"${CPU}" != x && { echo "${CPU}-unknown-linux-gnu"; exit; }
;;
mips64:Linux:*:*)
eval $set_cc_for_build
sed 's/^ //' << EOF >$dummy.c
#undef CPU
#undef mips64
#undef mips64el
#if defined(__MIPSEL__) || defined(__MIPSEL) || defined(_MIPSEL) || defined(MIPSEL)
CPU=mips64el
#else
#if defined(__MIPSEB__) || defined(__MIPSEB) || defined(_MIPSEB) || defined(MIPSEB)
CPU=mips64
#else
CPU=
#endif
#endif
EOF
eval "`$CC_FOR_BUILD -E $dummy.c 2>/dev/null | sed -n '
/^CPU/{
s: ::g
p
}'`"
eval `$CC_FOR_BUILD -E $dummy.c 2>/dev/null | grep '^CPU'`
test x"${CPU}" != x && { echo "${CPU}-unknown-linux-gnu"; exit; }
;;
or32:Linux:*:*)
echo or32-unknown-linux-gnu
exit ;;
ppc:Linux:*:*)
echo powerpc-unknown-linux-gnu
exit ;;
ppc64:Linux:*:*)
echo powerpc64-unknown-linux-gnu
exit ;;
alpha:Linux:*:*)
case `sed -n '/^cpu model/s/^.*: \(.*\)/\1/p' < /proc/cpuinfo` in
EV5) UNAME_MACHINE=alphaev5 ;;
EV56) UNAME_MACHINE=alphaev56 ;;
PCA56) UNAME_MACHINE=alphapca56 ;;
PCA57) UNAME_MACHINE=alphapca56 ;;
EV6) UNAME_MACHINE=alphaev6 ;;
EV67) UNAME_MACHINE=alphaev67 ;;
EV68*) UNAME_MACHINE=alphaev68 ;;
esac
objdump --private-headers /bin/sh | grep ld.so.1 >/dev/null
if test "$?" = 0 ; then LIBC="libc1" ; else LIBC="" ; fi
echo ${UNAME_MACHINE}-unknown-linux-gnu${LIBC}
exit ;;
padre:Linux:*:*)
echo sparc-unknown-linux-gnu
exit ;;
parisc64:Linux:*:* | hppa64:Linux:*:*)
echo hppa64-unknown-linux-gnu
exit ;;
parisc:Linux:*:* | hppa:Linux:*:*)
# Look for CPU level
case `grep '^cpu[^a-z]*:' /proc/cpuinfo 2>/dev/null | cut -d' ' -f2` in
@ -962,8 +949,11 @@ EOF
*) echo hppa-unknown-linux-gnu ;;
esac
exit ;;
parisc64:Linux:*:* | hppa64:Linux:*:*)
echo hppa64-unknown-linux-gnu
ppc64:Linux:*:*)
echo powerpc64-unknown-linux-gnu
exit ;;
ppc:Linux:*:*)
echo powerpc-unknown-linux-gnu
exit ;;
s390:Linux:*:* | s390x:Linux:*:*)
echo ${UNAME_MACHINE}-ibm-linux
@ -986,66 +976,6 @@ EOF
xtensa*:Linux:*:*)
echo ${UNAME_MACHINE}-unknown-linux-gnu
exit ;;
i*86:Linux:*:*)
# The BFD linker knows what the default object file format is, so
# first see if it will tell us. cd to the root directory to prevent
# problems with other programs or directories called `ld' in the path.
# Set LC_ALL=C to ensure ld outputs messages in English.
ld_supported_targets=`cd /; LC_ALL=C ld --help 2>&1 \
| sed -ne '/supported targets:/!d
s/[ ][ ]*/ /g
s/.*supported targets: *//
s/ .*//
p'`
case "$ld_supported_targets" in
elf32-i386)
TENTATIVE="${UNAME_MACHINE}-pc-linux-gnu"
;;
a.out-i386-linux)
echo "${UNAME_MACHINE}-pc-linux-gnuaout"
exit ;;
"")
# Either a pre-BFD a.out linker (linux-gnuoldld) or
# one that does not give us useful --help.
echo "${UNAME_MACHINE}-pc-linux-gnuoldld"
exit ;;
esac
# Determine whether the default compiler is a.out or elf
eval $set_cc_for_build
sed 's/^ //' << EOF >$dummy.c
#include <features.h>
#ifdef __ELF__
# ifdef __GLIBC__
# if __GLIBC__ >= 2
LIBC=gnu
# else
LIBC=gnulibc1
# endif
# else
LIBC=gnulibc1
# endif
#else
#if defined(__INTEL_COMPILER) || defined(__PGI) || defined(__SUNPRO_C) || defined(__SUNPRO_CC)
LIBC=gnu
#else
LIBC=gnuaout
#endif
#endif
#ifdef __dietlibc__
LIBC=dietlibc
#endif
EOF
eval "`$CC_FOR_BUILD -E $dummy.c 2>/dev/null | sed -n '
/^LIBC/{
s: ::g
p
}'`"
test x"${LIBC}" != x && {
echo "${UNAME_MACHINE}-pc-linux-${LIBC}"
exit
}
test x"${TENTATIVE}" != x && { echo "${TENTATIVE}"; exit; }
;;
i*86:DYNIX/ptx:4*:*)
# ptx 4.0 does uname -s correctly, with DYNIX/ptx in there.
# earlier versions are messed up and put the nodename in both
@ -1074,7 +1004,7 @@ EOF
i*86:syllable:*:*)
echo ${UNAME_MACHINE}-pc-syllable
exit ;;
i*86:LynxOS:2.*:* | i*86:LynxOS:3.[01]*:* | i*86:LynxOS:4.0*:*)
i*86:LynxOS:2.*:* | i*86:LynxOS:3.[01]*:* | i*86:LynxOS:4.[02]*:*)
echo i386-unknown-lynxos${UNAME_RELEASE}
exit ;;
i*86:*DOS:*:*)
@ -1182,7 +1112,7 @@ EOF
rs6000:LynxOS:2.*:*)
echo rs6000-unknown-lynxos${UNAME_RELEASE}
exit ;;
PowerPC:LynxOS:2.*:* | PowerPC:LynxOS:3.[01]*:* | PowerPC:LynxOS:4.0*:*)
PowerPC:LynxOS:2.*:* | PowerPC:LynxOS:3.[01]*:* | PowerPC:LynxOS:4.[02]*:*)
echo powerpc-unknown-lynxos${UNAME_RELEASE}
exit ;;
SM[BE]S:UNIX_SV:*:*)
@ -1275,6 +1205,16 @@ EOF
*:Darwin:*:*)
UNAME_PROCESSOR=`uname -p` || UNAME_PROCESSOR=unknown
case $UNAME_PROCESSOR in
i386)
eval $set_cc_for_build
if [ "$CC_FOR_BUILD" != 'no_compiler_found' ]; then
if (echo '#ifdef __LP64__'; echo IS_64BIT_ARCH; echo '#endif') | \
(CCOPTS= $CC_FOR_BUILD -E - 2>/dev/null) | \
grep IS_64BIT_ARCH >/dev/null
then
UNAME_PROCESSOR="x86_64"
fi
fi ;;
unknown) UNAME_PROCESSOR=powerpc ;;
esac
echo ${UNAME_PROCESSOR}-apple-darwin${UNAME_RELEASE}

43
config.sub vendored
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@ -1,10 +1,10 @@
#! /bin/sh
# Configuration validation subroutine script.
# Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
# 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
# 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
# Free Software Foundation, Inc.
timestamp='2009-04-17'
timestamp='2009-11-20'
# This file is (in principle) common to ALL GNU software.
# The presence of a machine in this file suggests that SOME GNU software
@ -32,13 +32,16 @@ timestamp='2009-04-17'
# Please send patches to <config-patches@gnu.org>. Submit a context
# diff and a properly formatted ChangeLog entry.
# diff and a properly formatted GNU ChangeLog entry.
#
# Configuration subroutine to validate and canonicalize a configuration type.
# Supply the specified configuration type as an argument.
# If it is invalid, we print an error message on stderr and exit with code 1.
# Otherwise, we print the canonical config type on stdout and succeed.
# You can get the latest version of this script from:
# http://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.sub;hb=HEAD
# This file is supposed to be the same for all GNU packages
# and recognize all the CPU types, system types and aliases
# that are meaningful with *any* GNU software.
@ -149,10 +152,13 @@ case $os in
-convergent* | -ncr* | -news | -32* | -3600* | -3100* | -hitachi* |\
-c[123]* | -convex* | -sun | -crds | -omron* | -dg | -ultra | -tti* | \
-harris | -dolphin | -highlevel | -gould | -cbm | -ns | -masscomp | \
-apple | -axis | -knuth | -cray)
-apple | -axis | -knuth | -cray | -microblaze)
os=
basic_machine=$1
;;
-bluegene*)
os=-cnk
;;
-sim | -cisco | -oki | -wec | -winbond)
os=
basic_machine=$1
@ -281,6 +287,7 @@ case $basic_machine in
| pdp10 | pdp11 | pj | pjl \
| powerpc | powerpc64 | powerpc64le | powerpcle | ppcbe \
| pyramid \
| rx \
| score \
| sh | sh[1234] | sh[24]a | sh[24]aeb | sh[23]e | sh[34]eb | sheb | shbe | shle | sh[1234]le | sh3ele \
| sh64 | sh64le \
@ -288,13 +295,14 @@ case $basic_machine in
| sparcv8 | sparcv9 | sparcv9b | sparcv9v \
| spu | strongarm \
| tahoe | thumb | tic4x | tic80 | tron \
| ubicom32 \
| v850 | v850e \
| we32k \
| x86 | xc16x | xscale | xscalee[bl] | xstormy16 | xtensa \
| z8k | z80)
basic_machine=$basic_machine-unknown
;;
m6811 | m68hc11 | m6812 | m68hc12)
m6811 | m68hc11 | m6812 | m68hc12 | picochip)
# Motorola 68HC11/12.
basic_machine=$basic_machine-unknown
os=-none
@ -337,7 +345,7 @@ case $basic_machine in
| lm32-* \
| m32c-* | m32r-* | m32rle-* \
| m68000-* | m680[012346]0-* | m68360-* | m683?2-* | m68k-* \
| m88110-* | m88k-* | maxq-* | mcore-* | metag-* \
| m88110-* | m88k-* | maxq-* | mcore-* | metag-* | microblaze-* \
| mips-* | mipsbe-* | mipseb-* | mipsel-* | mipsle-* \
| mips16-* \
| mips64-* | mips64el-* \
@ -365,7 +373,7 @@ case $basic_machine in
| pdp10-* | pdp11-* | pj-* | pjl-* | pn-* | power-* \
| powerpc-* | powerpc64-* | powerpc64le-* | powerpcle-* | ppcbe-* \
| pyramid-* \
| romp-* | rs6000-* \
| romp-* | rs6000-* | rx-* \
| sh-* | sh[1234]-* | sh[24]a-* | sh[24]aeb-* | sh[23]e-* | sh[34]eb-* | sheb-* | shbe-* \
| shle-* | sh[1234]le-* | sh3ele-* | sh64-* | sh64le-* \
| sparc-* | sparc64-* | sparc64b-* | sparc64v-* | sparc86x-* | sparclet-* \
@ -374,6 +382,7 @@ case $basic_machine in
| tahoe-* | thumb-* \
| tic30-* | tic4x-* | tic54x-* | tic55x-* | tic6x-* | tic80-* | tile-* \
| tron-* \
| ubicom32-* \
| v850-* | v850e-* | vax-* \
| we32k-* \
| x86-* | x86_64-* | xc16x-* | xps100-* | xscale-* | xscalee[bl]-* \
@ -467,6 +476,10 @@ case $basic_machine in
basic_machine=bfin-`echo $basic_machine | sed 's/^[^-]*-//'`
os=-linux
;;
bluegene*)
basic_machine=powerpc-ibm
os=-cnk
;;
c90)
basic_machine=c90-cray
os=-unicos
@ -719,6 +732,9 @@ case $basic_machine in
basic_machine=ns32k-utek
os=-sysv
;;
microblaze)
basic_machine=microblaze-xilinx
;;
mingw32)
basic_machine=i386-pc
os=-mingw32
@ -1240,6 +1256,9 @@ case $os in
# First match some system type aliases
# that might get confused with valid system types.
# -solaris* is a basic system type, with this one exception.
-auroraux)
os=-auroraux
;;
-solaris1 | -solaris1.*)
os=`echo $os | sed -e 's|solaris1|sunos4|'`
;;
@ -1260,9 +1279,9 @@ case $os in
# Each alternative MUST END IN A *, to match a version number.
# -sysv* is not here because it comes later, after sysvr4.
-gnu* | -bsd* | -mach* | -minix* | -genix* | -ultrix* | -irix* \
| -*vms* | -sco* | -esix* | -isc* | -aix* | -sunos | -sunos[34]*\
| -hpux* | -unos* | -osf* | -luna* | -dgux* | -solaris* | -sym* \
| -kopensolaris* \
| -*vms* | -sco* | -esix* | -isc* | -aix* | -cnk* | -sunos | -sunos[34]*\
| -hpux* | -unos* | -osf* | -luna* | -dgux* | -auroraux* | -solaris* \
| -sym* | -kopensolaris* \
| -amigaos* | -amigados* | -msdos* | -newsos* | -unicos* | -aof* \
| -aos* | -aros* \
| -nindy* | -vxsim* | -vxworks* | -ebmon* | -hms* | -mvs* \
@ -1283,7 +1302,7 @@ case $os in
| -os2* | -vos* | -palmos* | -uclinux* | -nucleus* \
| -morphos* | -superux* | -rtmk* | -rtmk-nova* | -windiss* \
| -powermax* | -dnix* | -nx6 | -nx7 | -sei* | -dragonfly* \
| -skyos* | -haiku* | -rdos* | -toppers* | -drops*)
| -skyos* | -haiku* | -rdos* | -toppers* | -drops* | -es*)
# Remember, each alternative MUST END IN *, to match a version number.
;;
-qnx*)
@ -1613,7 +1632,7 @@ case $basic_machine in
-sunos*)
vendor=sun
;;
-aix*)
-cnk*|-aix*)
vendor=ibm
;;
-beos*)

6081
configure vendored
View File

File diff suppressed because it is too large Load Diff

2
configure.ac
View File

@ -5,7 +5,7 @@
# Configure script for IJG libjpeg
#
AC_INIT([libjpeg], [7.0])
AC_INIT([libjpeg], [8.0])
# Directory where autotools helper scripts lives.
AC_CONFIG_AUX_DIR([.])

9
djpeg.1
View File

@ -1,4 +1,4 @@
.TH DJPEG 1 "28 March 2009"
.TH DJPEG 1 "3 October 2009"
.SH NAME
djpeg \- decompress a JPEG file to an image file
.SH SYNOPSIS
@ -62,9 +62,10 @@ runs noticeably faster in this mode.
.TP
.BI \-scale " M/N"
Scale the output image by a factor M/N. Currently supported scale factors are
M/8 with all M from 1 to 16. If the /N part is omitted, then M specifies the
DCT scaled size to be applied on the given input, which is currently
equivalent to M/8 scaling, since the source DCT size is currently always 8.
M/N with all M from 1 to 16, where N is the source DCT size, which is 8 for
baseline JPEG. If the /N part is omitted, then M specifies the DCT scaled
size to be applied on the given input. For baseline JPEG this is equivalent
to M/8 scaling, since the source DCT size for baseline JPEG is 8.
Scaling is handy if the image is larger than your screen; also,
.B djpeg
runs much faster when scaling down the output.

4
filelist.txt
View File

@ -73,7 +73,7 @@ jfdctflt.c Forward DCT using floating-point arithmetic.
jchuff.c Huffman entropy coding.
jcarith.c Arithmetic entropy coding.
jcmarker.c JPEG marker writing.
jdatadst.c Data destination manager for stdio output.
jdatadst.c Data destination managers for memory and stdio output.
Decompression side of the library:
@ -95,7 +95,7 @@ jdmerge.c Merged upsampling/color conversion (faster, lower quality).
jquant1.c One-pass color quantization using a fixed-spacing colormap.
jquant2.c Two-pass color quantization using a custom-generated colormap.
Also handles one-pass quantization to an externally given map.
jdatasrc.c Data source manager for stdio input.
jdatasrc.c Data source managers for memory and stdio input.
Support files for both compression and decompression:

237
jaricom.c
View File

@ -1,7 +1,7 @@
/*
* jaricom.c
*
* Developed 1997 by Guido Vollbeding.
* Developed 1997-2009 by Guido Vollbeding.
* This file is part of the Independent JPEG Group's software.
* For conditions of distribution and use, see the accompanying README file.
*
@ -26,123 +26,128 @@
* implementation (jbig_tab.c).
*/
#define V(a,b,c,d) (((INT32)a << 16) | ((INT32)c << 8) | ((INT32)d << 7) | b)
#define V(i,a,b,c,d) (((INT32)a << 16) | ((INT32)c << 8) | ((INT32)d << 7) | b)
const INT32 jaritab[113] = {
const INT32 jpeg_aritab[113+1] = {
/*
* Index, Qe_Value, Next_Index_LPS, Next_Index_MPS, Switch_MPS
*/
/* 0 */ V( 0x5a1d, 1, 1, 1 ),
/* 1 */ V( 0x2586, 14, 2, 0 ),
/* 2 */ V( 0x1114, 16, 3, 0 ),
/* 3 */ V( 0x080b, 18, 4, 0 ),
/* 4 */ V( 0x03d8, 20, 5, 0 ),
/* 5 */ V( 0x01da, 23, 6, 0 ),
/* 6 */ V( 0x00e5, 25, 7, 0 ),
/* 7 */ V( 0x006f, 28, 8, 0 ),
/* 8 */ V( 0x0036, 30, 9, 0 ),
/* 9 */ V( 0x001a, 33, 10, 0 ),
/* 10 */ V( 0x000d, 35, 11, 0 ),
/* 11 */ V( 0x0006, 9, 12, 0 ),
/* 12 */ V( 0x0003, 10, 13, 0 ),
/* 13 */ V( 0x0001, 12, 13, 0 ),
/* 14 */ V( 0x5a7f, 15, 15, 1 ),
/* 15 */ V( 0x3f25, 36, 16, 0 ),
/* 16 */ V( 0x2cf2, 38, 17, 0 ),
/* 17 */ V( 0x207c, 39, 18, 0 ),
/* 18 */ V( 0x17b9, 40, 19, 0 ),
/* 19 */ V( 0x1182, 42, 20, 0 ),
/* 20 */ V( 0x0cef, 43, 21, 0 ),
/* 21 */ V( 0x09a1, 45, 22, 0 ),
/* 22 */ V( 0x072f, 46, 23, 0 ),
/* 23 */ V( 0x055c, 48, 24, 0 ),
/* 24 */ V( 0x0406, 49, 25, 0 ),
/* 25 */ V( 0x0303, 51, 26, 0 ),
/* 26 */ V( 0x0240, 52, 27, 0 ),
/* 27 */ V( 0x01b1, 54, 28, 0 ),
/* 28 */ V( 0x0144, 56, 29, 0 ),
/* 29 */ V( 0x00f5, 57, 30, 0 ),
/* 30 */ V( 0x00b7, 59, 31, 0 ),
/* 31 */ V( 0x008a, 60, 32, 0 ),
/* 32 */ V( 0x0068, 62, 33, 0 ),
/* 33 */ V( 0x004e, 63, 34, 0 ),
/* 34 */ V( 0x003b, 32, 35, 0 ),
/* 35 */ V( 0x002c, 33, 9, 0 ),
/* 36 */ V( 0x5ae1, 37, 37, 1 ),
/* 37 */ V( 0x484c, 64, 38, 0 ),
/* 38 */ V( 0x3a0d, 65, 39, 0 ),
/* 39 */ V( 0x2ef1, 67, 40, 0 ),
/* 40 */ V( 0x261f, 68, 41, 0 ),
/* 41 */ V( 0x1f33, 69, 42, 0 ),
/* 42 */ V( 0x19a8, 70, 43, 0 ),
/* 43 */ V( 0x1518, 72, 44, 0 ),
/* 44 */ V( 0x1177, 73, 45, 0 ),
/* 45 */ V( 0x0e74, 74, 46, 0 ),
/* 46 */ V( 0x0bfb, 75, 47, 0 ),
/* 47 */ V( 0x09f8, 77, 48, 0 ),
/* 48 */ V( 0x0861, 78, 49, 0 ),
/* 49 */ V( 0x0706, 79, 50, 0 ),
/* 50 */ V( 0x05cd, 48, 51, 0 ),
/* 51 */ V( 0x04de, 50, 52, 0 ),
/* 52 */ V( 0x040f, 50, 53, 0 ),
/* 53 */ V( 0x0363, 51, 54, 0 ),
/* 54 */ V( 0x02d4, 52, 55, 0 ),
/* 55 */ V( 0x025c, 53, 56, 0 ),
/* 56 */ V( 0x01f8, 54, 57, 0 ),
/* 57 */ V( 0x01a4, 55, 58, 0 ),
/* 58 */ V( 0x0160, 56, 59, 0 ),
/* 59 */ V( 0x0125, 57, 60, 0 ),
/* 60 */ V( 0x00f6, 58, 61, 0 ),
/* 61 */ V( 0x00cb, 59, 62, 0 ),
/* 62 */ V( 0x00ab, 61, 63, 0 ),
/* 63 */ V( 0x008f, 61, 32, 0 ),
/* 64 */ V( 0x5b12, 65, 65, 1 ),
/* 65 */ V( 0x4d04, 80, 66, 0 ),
/* 66 */ V( 0x412c, 81, 67, 0 ),
/* 67 */ V( 0x37d8, 82, 68, 0 ),
/* 68 */ V( 0x2fe8, 83, 69, 0 ),
/* 69 */ V( 0x293c, 84, 70, 0 ),
/* 70 */ V( 0x2379, 86, 71, 0 ),
/* 71 */ V( 0x1edf, 87, 72, 0 ),
/* 72 */ V( 0x1aa9, 87, 73, 0 ),
/* 73 */ V( 0x174e, 72, 74, 0 ),
/* 74 */ V( 0x1424, 72, 75, 0 ),
/* 75 */ V( 0x119c, 74, 76, 0 ),
/* 76 */ V( 0x0f6b, 74, 77, 0 ),
/* 77 */ V( 0x0d51, 75, 78, 0 ),
/* 78 */ V( 0x0bb6, 77, 79, 0 ),
/* 79 */ V( 0x0a40, 77, 48, 0 ),
/* 80 */ V( 0x5832, 80, 81, 1 ),
/* 81 */ V( 0x4d1c, 88, 82, 0 ),
/* 82 */ V( 0x438e, 89, 83, 0 ),
/* 83 */ V( 0x3bdd, 90, 84, 0 ),
/* 84 */ V( 0x34ee, 91, 85, 0 ),
/* 85 */ V( 0x2eae, 92, 86, 0 ),
/* 86 */ V( 0x299a, 93, 87, 0 ),
/* 87 */ V( 0x2516, 86, 71, 0 ),
/* 88 */ V( 0x5570, 88, 89, 1 ),
/* 89 */ V( 0x4ca9, 95, 90, 0 ),
/* 90 */ V( 0x44d9, 96, 91, 0 ),
/* 91 */ V( 0x3e22, 97, 92, 0 ),
/* 92 */ V( 0x3824, 99, 93, 0 ),
/* 93 */ V( 0x32b4, 99, 94, 0 ),
/* 94 */ V( 0x2e17, 93, 86, 0 ),
/* 95 */ V( 0x56a8, 95, 96, 1 ),
/* 96 */ V( 0x4f46, 101, 97, 0 ),
/* 97 */ V( 0x47e5, 102, 98, 0 ),
/* 98 */ V( 0x41cf, 103, 99, 0 ),
/* 99 */ V( 0x3c3d, 104, 100, 0 ),
/* 100 */ V( 0x375e, 99, 93, 0 ),
/* 101 */ V( 0x5231, 105, 102, 0 ),
/* 102 */ V( 0x4c0f, 106, 103, 0 ),
/* 103 */ V( 0x4639, 107, 104, 0 ),
/* 104 */ V( 0x415e, 103, 99, 0 ),
/* 105 */ V( 0x5627, 105, 106, 1 ),
/* 106 */ V( 0x50e7, 108, 107, 0 ),
/* 107 */ V( 0x4b85, 109, 103, 0 ),
/* 108 */ V( 0x5597, 110, 109, 0 ),
/* 109 */ V( 0x504f, 111, 107, 0 ),
/* 110 */ V( 0x5a10, 110, 111, 1 ),
/* 111 */ V( 0x5522, 112, 109, 0 ),
/* 112 */ V( 0x59eb, 112, 111, 1 )
V( 0, 0x5a1d, 1, 1, 1 ),
V( 1, 0x2586, 14, 2, 0 ),
V( 2, 0x1114, 16, 3, 0 ),
V( 3, 0x080b, 18, 4, 0 ),
V( 4, 0x03d8, 20, 5, 0 ),
V( 5, 0x01da, 23, 6, 0 ),
V( 6, 0x00e5, 25, 7, 0 ),
V( 7, 0x006f, 28, 8, 0 ),
V( 8, 0x0036, 30, 9, 0 ),
V( 9, 0x001a, 33, 10, 0 ),
V( 10, 0x000d, 35, 11, 0 ),
V( 11, 0x0006, 9, 12, 0 ),
V( 12, 0x0003, 10, 13, 0 ),
V( 13, 0x0001, 12, 13, 0 ),
V( 14, 0x5a7f, 15, 15, 1 ),
V( 15, 0x3f25, 36, 16, 0 ),
V( 16, 0x2cf2, 38, 17, 0 ),
V( 17, 0x207c, 39, 18, 0 ),
V( 18, 0x17b9, 40, 19, 0 ),
V( 19, 0x1182, 42, 20, 0 ),
V( 20, 0x0cef, 43, 21, 0 ),
V( 21, 0x09a1, 45, 22, 0 ),
V( 22, 0x072f, 46, 23, 0 ),
V( 23, 0x055c, 48, 24, 0 ),
V( 24, 0x0406, 49, 25, 0 ),
V( 25, 0x0303, 51, 26, 0 ),
V( 26, 0x0240, 52, 27, 0 ),
V( 27, 0x01b1, 54, 28, 0 ),
V( 28, 0x0144, 56, 29, 0 ),
V( 29, 0x00f5, 57, 30, 0 ),
V( 30, 0x00b7, 59, 31, 0 ),
V( 31, 0x008a, 60, 32, 0 ),
V( 32, 0x0068, 62, 33, 0 ),
V( 33, 0x004e, 63, 34, 0 ),
V( 34, 0x003b, 32, 35, 0 ),
V( 35, 0x002c, 33, 9, 0 ),
V( 36, 0x5ae1, 37, 37, 1 ),
V( 37, 0x484c, 64, 38, 0 ),
V( 38, 0x3a0d, 65, 39, 0 ),
V( 39, 0x2ef1, 67, 40, 0 ),
V( 40, 0x261f, 68, 41, 0 ),
V( 41, 0x1f33, 69, 42, 0 ),
V( 42, 0x19a8, 70, 43, 0 ),
V( 43, 0x1518, 72, 44, 0 ),
V( 44, 0x1177, 73, 45, 0 ),
V( 45, 0x0e74, 74, 46, 0 ),
V( 46, 0x0bfb, 75, 47, 0 ),
V( 47, 0x09f8, 77, 48, 0 ),
V( 48, 0x0861, 78, 49, 0 ),
V( 49, 0x0706, 79, 50, 0 ),
V( 50, 0x05cd, 48, 51, 0 ),
V( 51, 0x04de, 50, 52, 0 ),
V( 52, 0x040f, 50, 53, 0 ),
V( 53, 0x0363, 51, 54, 0 ),
V( 54, 0x02d4, 52, 55, 0 ),
V( 55, 0x025c, 53, 56, 0 ),
V( 56, 0x01f8, 54, 57, 0 ),
V( 57, 0x01a4, 55, 58, 0 ),
V( 58, 0x0160, 56, 59, 0 ),
V( 59, 0x0125, 57, 60, 0 ),
V( 60, 0x00f6, 58, 61, 0 ),
V( 61, 0x00cb, 59, 62, 0 ),
V( 62, 0x00ab, 61, 63, 0 ),
V( 63, 0x008f, 61, 32, 0 ),
V( 64, 0x5b12, 65, 65, 1 ),
V( 65, 0x4d04, 80, 66, 0 ),
V( 66, 0x412c, 81, 67, 0 ),
V( 67, 0x37d8, 82, 68, 0 ),
V( 68, 0x2fe8, 83, 69, 0 ),
V( 69, 0x293c, 84, 70, 0 ),
V( 70, 0x2379, 86, 71, 0 ),
V( 71, 0x1edf, 87, 72, 0 ),
V( 72, 0x1aa9, 87, 73, 0 ),
V( 73, 0x174e, 72, 74, 0 ),
V( 74, 0x1424, 72, 75, 0 ),
V( 75, 0x119c, 74, 76, 0 ),
V( 76, 0x0f6b, 74, 77, 0 ),
V( 77, 0x0d51, 75, 78, 0 ),
V( 78, 0x0bb6, 77, 79, 0 ),
V( 79, 0x0a40, 77, 48, 0 ),
V( 80, 0x5832, 80, 81, 1 ),
V( 81, 0x4d1c, 88, 82, 0 ),
V( 82, 0x438e, 89, 83, 0 ),
V( 83, 0x3bdd, 90, 84, 0 ),
V( 84, 0x34ee, 91, 85, 0 ),
V( 85, 0x2eae, 92, 86, 0 ),
V( 86, 0x299a, 93, 87, 0 ),
V( 87, 0x2516, 86, 71, 0 ),
V( 88, 0x5570, 88, 89, 1 ),
V( 89, 0x4ca9, 95, 90, 0 ),
V( 90, 0x44d9, 96, 91, 0 ),
V( 91, 0x3e22, 97, 92, 0 ),
V( 92, 0x3824, 99, 93, 0 ),
V( 93, 0x32b4, 99, 94, 0 ),
V( 94, 0x2e17, 93, 86, 0 ),
V( 95, 0x56a8, 95, 96, 1 ),
V( 96, 0x4f46, 101, 97, 0 ),
V( 97, 0x47e5, 102, 98, 0 ),
V( 98, 0x41cf, 103, 99, 0 ),
V( 99, 0x3c3d, 104, 100, 0 ),
V( 100, 0x375e, 99, 93, 0 ),
V( 101, 0x5231, 105, 102, 0 ),
V( 102, 0x4c0f, 106, 103, 0 ),
V( 103, 0x4639, 107, 104, 0 ),
V( 104, 0x415e, 103, 99, 0 ),
V( 105, 0x5627, 105, 106, 1 ),
V( 106, 0x50e7, 108, 107, 0 ),
V( 107, 0x4b85, 109, 103, 0 ),
V( 108, 0x5597, 110, 109, 0 ),
V( 109, 0x504f, 111, 107, 0 ),
V( 110, 0x5a10, 110, 111, 1 ),
V( 111, 0x5522, 112, 109, 0 ),
V( 112, 0x59eb, 112, 111, 1 ),
/*
* This last entry is used for fixed probability estimate of 0.5
* as recommended in Section 10.3 Table 5 of ITU-T Rec. T.851.
*/
V( 113, 0x5a1d, 113, 113, 0 )
};

99
jcarith.c
View File

@ -1,7 +1,7 @@
/*
* jcarith.c
*
* Developed 1997 by Guido Vollbeding.
* Developed 1997-2009 by Guido Vollbeding.
* This file is part of the Independent JPEG Group's software.
* For conditions of distribution and use, see the accompanying README file.
*
@ -40,6 +40,9 @@ typedef struct {
/* Pointers to statistics areas (these workspaces have image lifespan) */
unsigned char * dc_stats[NUM_ARITH_TBLS];
unsigned char * ac_stats[NUM_ARITH_TBLS];
/* Statistics bin for coding with fixed probability 0.5 */
unsigned char fixed_bin[4];
} arith_entropy_encoder;
typedef arith_entropy_encoder * arith_entropy_ptr;
@ -48,8 +51,6 @@ typedef arith_entropy_encoder * arith_entropy_ptr;
* for the statistics area.
* According to sections F.1.4.4.1.3 and F.1.4.4.2, we need at least
* 49 statistics bins for DC, and 245 statistics bins for AC coding.
* Note that we use one additional AC bin for codings with fixed
* probability (0.5), thus the minimum number for AC is 246.
*
* We use a compact representation with 1 byte per statistics bin,
* thus the numbers directly represent byte sizes.
@ -217,7 +218,6 @@ finish_pass (j_compress_ptr cinfo)
LOCAL(void)
arith_encode (j_compress_ptr cinfo, unsigned char *st, int val)
{
extern const INT32 jaritab[];
register arith_entropy_ptr e = (arith_entropy_ptr) cinfo->entropy;
register unsigned char nl, nm;
register INT32 qe, temp;
@ -227,7 +227,7 @@ arith_encode (j_compress_ptr cinfo, unsigned char *st, int val)
* Qe values and probability estimation state machine
*/
sv = *st;
qe = jaritab[sv & 0x7F]; /* => Qe_Value */
qe = jpeg_aritab[sv & 0x7F]; /* => Qe_Value */
nl = qe & 0xFF; qe >>= 8; /* Next_Index_LPS + Switch_MPS */
nm = qe & 0xFF; qe >>= 8; /* Next_Index_MPS */
@ -327,16 +327,18 @@ emit_restart (j_compress_ptr cinfo, int restart_num)
emit_byte(0xFF, cinfo);
emit_byte(JPEG_RST0 + restart_num, cinfo);
/* Re-initialize statistics areas */
for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
compptr = cinfo->cur_comp_info[ci];
/* Re-initialize statistics areas */
if (cinfo->progressive_mode == 0 || (cinfo->Ss == 0 && cinfo->Ah == 0)) {
/* DC needs no table for refinement scan */
if (cinfo->Ss == 0 && cinfo->Ah == 0) {
MEMZERO(entropy->dc_stats[compptr->dc_tbl_no], DC_STAT_BINS);
/* Reset DC predictions to 0 */
entropy->last_dc_val[ci] = 0;
entropy->dc_context[ci] = 0;
}
if (cinfo->progressive_mode == 0 || cinfo->Ss) {
/* AC needs no table when not present */
if (cinfo->Se) {
MEMZERO(entropy->ac_stats[compptr->ac_tbl_no], AC_STAT_BINS);
}
}
@ -427,9 +429,9 @@ encode_mcu_DC_first (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
}
arith_encode(cinfo, st, 0);
/* Section F.1.4.4.1.2: Establish dc_context conditioning category */
if (m < (int) (((INT32) 1 << cinfo->arith_dc_L[tbl]) >> 1))
if (m < (int) ((1L << cinfo->arith_dc_L[tbl]) >> 1))
entropy->dc_context[ci] = 0; /* zero diff category */
else if (m > (int) (((INT32) 1 << cinfo->arith_dc_U[tbl]) >> 1))
else if (m > (int) ((1L << cinfo->arith_dc_U[tbl]) >> 1))
entropy->dc_context[ci] += 8; /* large diff category */
/* Figure F.9: Encoding the magnitude bit pattern of v */
st += 14;
@ -455,6 +457,7 @@ encode_mcu_AC_first (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
unsigned char *st;
int tbl, k, ke;
int v, v2, m;
const int * natural_order;
/* Emit restart marker if needed */
if (cinfo->restart_interval) {
@ -467,6 +470,8 @@ encode_mcu_AC_first (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
entropy->restarts_to_go--;
}
natural_order = cinfo->natural_order;
/* Encode the MCU data block */
block = MCU_data[0];
tbl = cinfo->cur_comp_info[0]->ac_tbl_no;
@ -474,12 +479,12 @@ encode_mcu_AC_first (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
/* Sections F.1.4.2 & F.1.4.4.2: Encoding of AC coefficients */
/* Establish EOB (end-of-block) index */
for (ke = cinfo->Se + 1; ke > 1; ke--)
for (ke = cinfo->Se; ke > 0; ke--)
/* We must apply the point transform by Al. For AC coefficients this
* is an integer division with rounding towards 0. To do this portably
* in C, we shift after obtaining the absolute value.
*/
if ((v = (*block)[jpeg_natural_order[ke - 1]]) >= 0) {
if ((v = (*block)[natural_order[ke]]) >= 0) {
if (v >>= cinfo->Al) break;
} else {
v = -v;
@ -487,22 +492,21 @@ encode_mcu_AC_first (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
}
/* Figure F.5: Encode_AC_Coefficients */
for (k = cinfo->Ss; k < ke; k++) {
for (k = cinfo->Ss; k <= ke; k++) {
st = entropy->ac_stats[tbl] + 3 * (k - 1);
arith_encode(cinfo, st, 0); /* EOB decision */
entropy->ac_stats[tbl][245] = 0;
for (;;) {
if ((v = (*block)[jpeg_natural_order[k]]) >= 0) {
if ((v = (*block)[natural_order[k]]) >= 0) {
if (v >>= cinfo->Al) {
arith_encode(cinfo, st + 1, 1);
arith_encode(cinfo, entropy->ac_stats[tbl] + 245, 0);
arith_encode(cinfo, entropy->fixed_bin, 0);
break;
}
} else {
v = -v;
if (v >>= cinfo->Al) {
arith_encode(cinfo, st + 1, 1);
arith_encode(cinfo, entropy->ac_stats[tbl] + 245, 1);
arith_encode(cinfo, entropy->fixed_bin, 1);
break;
}
}
@ -551,7 +555,7 @@ METHODDEF(boolean)
encode_mcu_DC_refine (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
{
arith_entropy_ptr entropy = (arith_entropy_ptr) cinfo->entropy;
unsigned char st[4];
unsigned char *st;
int Al, blkn;
/* Emit restart marker if needed */
@ -565,11 +569,11 @@ encode_mcu_DC_refine (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
entropy->restarts_to_go--;
}
st = entropy->fixed_bin; /* use fixed probability estimation */
Al = cinfo->Al;
/* Encode the MCU data blocks */
for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
st[0] = 0; /* use fixed probability estimation */
/* We simply emit the Al'th bit of the DC coefficient value. */
arith_encode(cinfo, st, (MCU_data[blkn][0][0] >> Al) & 1);
}
@ -590,6 +594,7 @@ encode_mcu_AC_refine (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
unsigned char *st;
int tbl, k, ke, kex;
int v;
const int * natural_order;
/* Emit restart marker if needed */
if (cinfo->restart_interval) {
@ -602,6 +607,8 @@ encode_mcu_AC_refine (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
entropy->restarts_to_go--;
}
natural_order = cinfo->natural_order;
/* Encode the MCU data block */
block = MCU_data[0];
tbl = cinfo->cur_comp_info[0]->ac_tbl_no;
@ -609,12 +616,12 @@ encode_mcu_AC_refine (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
/* Section G.1.3.3: Encoding of AC coefficients */
/* Establish EOB (end-of-block) index */
for (ke = cinfo->Se + 1; ke > 1; ke--)
for (ke = cinfo->Se; ke > 0; ke--)
/* We must apply the point transform by Al. For AC coefficients this
* is an integer division with rounding towards 0. To do this portably
* in C, we shift after obtaining the absolute value.
*/
if ((v = (*block)[jpeg_natural_order[ke - 1]]) >= 0) {
if ((v = (*block)[natural_order[ke]]) >= 0) {
if (v >>= cinfo->Al) break;
} else {
v = -v;
@ -622,8 +629,8 @@ encode_mcu_AC_refine (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
}
/* Establish EOBx (previous stage end-of-block) index */
for (kex = ke; kex > 1; kex--)
if ((v = (*block)[jpeg_natural_order[kex - 1]]) >= 0) {
for (kex = ke; kex > 0; kex--)
if ((v = (*block)[natural_order[kex]]) >= 0) {
if (v >>= cinfo->Ah) break;
} else {
v = -v;
@ -631,19 +638,18 @@ encode_mcu_AC_refine (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
}
/* Figure G.10: Encode_AC_Coefficients_SA */
for (k = cinfo->Ss; k < ke; k++) {
for (k = cinfo->Ss; k <= ke; k++) {
st = entropy->ac_stats[tbl] + 3 * (k - 1);
if (k >= kex)
if (k > kex)
arith_encode(cinfo, st, 0); /* EOB decision */
entropy->ac_stats[tbl][245] = 0;
for (;;) {
if ((v = (*block)[jpeg_natural_order[k]]) >= 0) {
if ((v = (*block)[natural_order[k]]) >= 0) {
if (v >>= cinfo->Al) {
if (v >> 1) /* previously nonzero coef */
arith_encode(cinfo, st + 2, (v & 1));
else { /* newly nonzero coef */
arith_encode(cinfo, st + 1, 1);
arith_encode(cinfo, entropy->ac_stats[tbl] + 245, 0);
arith_encode(cinfo, entropy->fixed_bin, 0);
}
break;
}
@ -654,7 +660,7 @@ encode_mcu_AC_refine (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
arith_encode(cinfo, st + 2, (v & 1));
else { /* newly nonzero coef */
arith_encode(cinfo, st + 1, 1);
arith_encode(cinfo, entropy->ac_stats[tbl] + 245, 1);
arith_encode(cinfo, entropy->fixed_bin, 1);
}
break;
}
@ -685,6 +691,7 @@ encode_mcu (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
unsigned char *st;
int blkn, ci, tbl, k, ke;
int v, v2, m;
const int * natural_order;
/* Emit restart marker if needed */
if (cinfo->restart_interval) {
@ -697,6 +704,8 @@ encode_mcu (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
entropy->restarts_to_go--;
}
natural_order = cinfo->natural_order;
/* Encode the MCU data blocks */
for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
block = MCU_data[blkn];
@ -744,9 +753,9 @@ encode_mcu (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
}
arith_encode(cinfo, st, 0);
/* Section F.1.4.4.1.2: Establish dc_context conditioning category */
if (m < (int) (((INT32) 1 << cinfo->arith_dc_L[tbl]) >> 1))
if (m < (int) ((1L << cinfo->arith_dc_L[tbl]) >> 1))
entropy->dc_context[ci] = 0; /* zero diff category */
else if (m > (int) (((INT32) 1 << cinfo->arith_dc_U[tbl]) >> 1))
else if (m > (int) ((1L << cinfo->arith_dc_U[tbl]) >> 1))
entropy->dc_context[ci] += 8; /* large diff category */
/* Figure F.9: Encoding the magnitude bit pattern of v */
st += 14;
@ -759,25 +768,24 @@ encode_mcu (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
tbl = compptr->ac_tbl_no;
/* Establish EOB (end-of-block) index */
for (ke = DCTSIZE2; ke > 1; ke--)
if ((*block)[jpeg_natural_order[ke - 1]]) break;
for (ke = cinfo->lim_Se; ke > 0; ke--)
if ((*block)[natural_order[ke]]) break;
/* Figure F.5: Encode_AC_Coefficients */
for (k = 1; k < ke; k++) {
for (k = 1; k <= ke; k++) {
st = entropy->ac_stats[tbl] + 3 * (k - 1);
arith_encode(cinfo, st, 0); /* EOB decision */
while ((v = (*block)[jpeg_natural_order[k]]) == 0) {
while ((v = (*block)[natural_order[k]]) == 0) {
arith_encode(cinfo, st + 1, 0); st += 3; k++;
}
arith_encode(cinfo, st + 1, 1);
/* Figure F.6: Encoding nonzero value v */
/* Figure F.7: Encoding the sign of v */
entropy->ac_stats[tbl][245] = 0;
if (v > 0) {
arith_encode(cinfo, entropy->ac_stats[tbl] + 245, 0);
arith_encode(cinfo, entropy->fixed_bin, 0);
} else {
v = -v;
arith_encode(cinfo, entropy->ac_stats[tbl] + 245, 1);
arith_encode(cinfo, entropy->fixed_bin, 1);
}
st += 2;
/* Figure F.8: Encoding the magnitude category of v */
@ -804,8 +812,8 @@ encode_mcu (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
while (m >>= 1)
arith_encode(cinfo, st, (m & v) ? 1 : 0);
}
/* Encode EOB decision only if k < DCTSIZE2 */
if (k < DCTSIZE2) {
/* Encode EOB decision only if k <= cinfo->lim_Se */
if (k <= cinfo->lim_Se) {
st = entropy->ac_stats[tbl] + 3 * (k - 1);
arith_encode(cinfo, st, 1);
}
@ -851,10 +859,11 @@ start_pass (j_compress_ptr cinfo, boolean gather_statistics)
} else
entropy->pub.encode_mcu = encode_mcu;
/* Allocate & initialize requested statistics areas */
for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
compptr = cinfo->cur_comp_info[ci];
/* Allocate & initialize requested statistics areas */
if (cinfo->progressive_mode == 0 || (cinfo->Ss == 0 && cinfo->Ah == 0)) {
/* DC needs no table for refinement scan */
if (cinfo->Ss == 0 && cinfo->Ah == 0) {
tbl = compptr->dc_tbl_no;
if (tbl < 0 || tbl >= NUM_ARITH_TBLS)
ERREXIT1(cinfo, JERR_NO_ARITH_TABLE, tbl);
@ -866,7 +875,8 @@ start_pass (j_compress_ptr cinfo, boolean gather_statistics)
entropy->last_dc_val[ci] = 0;
entropy->dc_context[ci] = 0;
}
if (cinfo->progressive_mode == 0 || cinfo->Ss) {
/* AC needs no table when not present */
if (cinfo->Se) {
tbl = compptr->ac_tbl_no;
if (tbl < 0 || tbl >= NUM_ARITH_TBLS)
ERREXIT1(cinfo, JERR_NO_ARITH_TABLE, tbl);
@ -918,4 +928,7 @@ jinit_arith_encoder (j_compress_ptr cinfo)
entropy->dc_stats[i] = NULL;
entropy->ac_stats[i] = NULL;
}
/* Initialize index for fixed probability estimation */
entropy->fixed_bin[0] = 113;
}

226
jchuff.c
View File

@ -87,8 +87,6 @@ typedef struct {
unsigned int restarts_to_go; /* MCUs left in this restart interval */
int next_restart_num; /* next restart number to write (0-7) */
/* Following four fields used only in sequential mode */
/* Pointers to derived tables (these workspaces have image lifespan) */
c_derived_tbl * dc_derived_tbls[NUM_HUFF_TBLS];
c_derived_tbl * ac_derived_tbls[NUM_HUFF_TBLS];
@ -114,15 +112,6 @@ typedef struct {
unsigned int BE; /* # of buffered correction bits before MCU */
char * bit_buffer; /* buffer for correction bits (1 per char) */
/* packing correction bits tightly would save some space but cost time... */
/* Pointers to derived tables (these workspaces have image lifespan).
* Since any one scan in progressive mode codes only DC or only AC,
* we only need one set of tables, not one for DC and one for AC.
*/
c_derived_tbl * derived_tbls[NUM_HUFF_TBLS];
/* Statistics tables for optimization; again, one set is enough */
long * count_ptrs[NUM_HUFF_TBLS];
} huff_entropy_encoder;
typedef huff_entropy_encoder * huff_entropy_ptr;
@ -419,12 +408,25 @@ flush_bits_e (huff_entropy_ptr entropy)
INLINE
LOCAL(void)
emit_symbol (huff_entropy_ptr entropy, int tbl_no, int symbol)
emit_dc_symbol (huff_entropy_ptr entropy, int tbl_no, int symbol)
{
if (entropy->gather_statistics)
entropy->count_ptrs[tbl_no][symbol]++;
entropy->dc_count_ptrs[tbl_no][symbol]++;
else {
c_derived_tbl * tbl = entropy->derived_tbls[tbl_no];
c_derived_tbl * tbl = entropy->dc_derived_tbls[tbl_no];
emit_bits_e(entropy, tbl->ehufco[symbol], tbl->ehufsi[symbol]);
}
}
INLINE
LOCAL(void)
emit_ac_symbol (huff_entropy_ptr entropy, int tbl_no, int symbol)
{
if (entropy->gather_statistics)
entropy->ac_count_ptrs[tbl_no][symbol]++;
else {
c_derived_tbl * tbl = entropy->ac_derived_tbls[tbl_no];
emit_bits_e(entropy, tbl->ehufco[symbol], tbl->ehufsi[symbol]);
}
}
@ -467,7 +469,7 @@ emit_eobrun (huff_entropy_ptr entropy)
if (nbits > 14)
ERREXIT(entropy->cinfo, JERR_HUFF_MISSING_CODE);
emit_symbol(entropy, entropy->ac_tbl_no, nbits << 4);
emit_ac_symbol(entropy, entropy->ac_tbl_no, nbits << 4);
if (nbits)
emit_bits_e(entropy, entropy->EOBRUN, nbits);
@ -592,7 +594,7 @@ encode_mcu_DC_first (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
ERREXIT(cinfo, JERR_BAD_DCT_COEF);
/* Count/emit the Huffman-coded symbol for the number of bits */
emit_symbol(entropy, compptr->dc_tbl_no, nbits);
emit_dc_symbol(entropy, compptr->dc_tbl_no, nbits);
/* Emit that number of bits of the value, if positive, */
/* or the complement of its magnitude, if negative. */
@ -629,8 +631,8 @@ encode_mcu_AC_first (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
register int temp, temp2;
register int nbits;
register int r, k;
int Se = cinfo->Se;
int Al = cinfo->Al;
int Se, Al;
const int * natural_order;
JBLOCKROW block;
entropy->next_output_byte = cinfo->dest->next_output_byte;
@ -641,6 +643,10 @@ encode_mcu_AC_first (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
if (entropy->restarts_to_go == 0)
emit_restart_e(entropy, entropy->next_restart_num);
Se = cinfo->Se;
Al = cinfo->Al;
natural_order = cinfo->natural_order;
/* Encode the MCU data block */
block = MCU_data[0];
@ -649,7 +655,7 @@ encode_mcu_AC_first (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
r = 0; /* r = run length of zeros */
for (k = cinfo->Ss; k <= Se; k++) {
if ((temp = (*block)[jpeg_natural_order[k]]) == 0) {
if ((temp = (*block)[natural_order[k]]) == 0) {
r++;
continue;
}
@ -678,7 +684,7 @@ encode_mcu_AC_first (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
emit_eobrun(entropy);
/* if run length > 15, must emit special run-length-16 codes (0xF0) */
while (r > 15) {
emit_symbol(entropy, entropy->ac_tbl_no, 0xF0);
emit_ac_symbol(entropy, entropy->ac_tbl_no, 0xF0);
r -= 16;
}
@ -691,7 +697,7 @@ encode_mcu_AC_first (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
ERREXIT(cinfo, JERR_BAD_DCT_COEF);
/* Count/emit Huffman symbol for run length / number of bits */
emit_symbol(entropy, entropy->ac_tbl_no, (r << 4) + nbits);
emit_ac_symbol(entropy, entropy->ac_tbl_no, (r << 4) + nbits);
/* Emit that number of bits of the value, if positive, */
/* or the complement of its magnitude, if negative. */
@ -785,8 +791,8 @@ encode_mcu_AC_refine (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
int EOB;
char *BR_buffer;
unsigned int BR;
int Se = cinfo->Se;
int Al = cinfo->Al;
int Se, Al;
const int * natural_order;
JBLOCKROW block;
int absvalues[DCTSIZE2];
@ -798,6 +804,10 @@ encode_mcu_AC_refine (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
if (entropy->restarts_to_go == 0)
emit_restart_e(entropy, entropy->next_restart_num);
Se = cinfo->Se;
Al = cinfo->Al;
natural_order = cinfo->natural_order;
/* Encode the MCU data block */
block = MCU_data[0];
@ -806,7 +816,7 @@ encode_mcu_AC_refine (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
*/
EOB = 0;
for (k = cinfo->Ss; k <= Se; k++) {
temp = (*block)[jpeg_natural_order[k]];
temp = (*block)[natural_order[k]];
/* We must apply the point transform by Al. For AC coefficients this
* is an integer division with rounding towards 0. To do this portably
* in C, we shift after obtaining the absolute value.
@ -836,7 +846,7 @@ encode_mcu_AC_refine (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
/* emit any pending EOBRUN and the BE correction bits */
emit_eobrun(entropy);
/* Emit ZRL */
emit_symbol(entropy, entropy->ac_tbl_no, 0xF0);
emit_ac_symbol(entropy, entropy->ac_tbl_no, 0xF0);
r -= 16;
/* Emit buffered correction bits that must be associated with ZRL */
emit_buffered_bits(entropy, BR_buffer, BR);
@ -859,10 +869,10 @@ encode_mcu_AC_refine (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
emit_eobrun(entropy);
/* Count/emit Huffman symbol for run length / number of bits */
emit_symbol(entropy, entropy->ac_tbl_no, (r << 4) + 1);
emit_ac_symbol(entropy, entropy->ac_tbl_no, (r << 4) + 1);
/* Emit output bit for newly-nonzero coef */
temp = ((*block)[jpeg_natural_order[k]] < 0) ? 0 : 1;
temp = ((*block)[natural_order[k]] < 0) ? 0 : 1;
emit_bits_e(entropy, (unsigned int) temp, 1);
/* Emit buffered correction bits that must be associated with this code */
@ -909,6 +919,8 @@ encode_one_block (working_state * state, JCOEFPTR block, int last_dc_val,
register int temp, temp2;
register int nbits;
register int k, r, i;
int Se = state->cinfo->lim_Se;
const int * natural_order = state->cinfo->natural_order;
/* Encode the DC coefficient difference per section F.1.2.1 */
@ -947,8 +959,8 @@ encode_one_block (working_state * state, JCOEFPTR block, int last_dc_val,
r = 0; /* r = run length of zeros */
for (k = 1; k < DCTSIZE2; k++) {
if ((temp = block[jpeg_natural_order[k]]) == 0) {
for (k = 1; k <= Se; k++) {
if ((temp = block[natural_order[k]]) == 0) {
r++;
} else {
/* if run length > 15, must emit special run-length-16 codes (0xF0) */
@ -1113,6 +1125,8 @@ htest_one_block (j_compress_ptr cinfo, JCOEFPTR block, int last_dc_val,
register int temp;
register int nbits;
register int k, r;
int Se = cinfo->lim_Se;
const int * natural_order = cinfo->natural_order;
/* Encode the DC coefficient difference per section F.1.2.1 */
@ -1139,8 +1153,8 @@ htest_one_block (j_compress_ptr cinfo, JCOEFPTR block, int last_dc_val,
r = 0; /* r = run length of zeros */
for (k = 1; k < DCTSIZE2; k++) {
if ((temp = block[jpeg_natural_order[k]]) == 0) {
for (k = 1; k <= Se; k++) {
if ((temp = block[natural_order[k]]) == 0) {
r++;
} else {
/* if run length > 15, must emit special run-length-16 codes (0xF0) */
@ -1383,63 +1397,44 @@ METHODDEF(void)
finish_pass_gather (j_compress_ptr cinfo)
{
huff_entropy_ptr entropy = (huff_entropy_ptr) cinfo->entropy;
int ci, dctbl, actbl, tbl;
int ci, tbl;
jpeg_component_info * compptr;
JHUFF_TBL **htblptr;
boolean did_dc[NUM_HUFF_TBLS];
boolean did_ac[NUM_HUFF_TBLS];
boolean did[NUM_HUFF_TBLS];
/* It's important not to apply jpeg_gen_optimal_table more than once
* per table, because it clobbers the input frequency counts!
*/
if (cinfo->progressive_mode) {
if (cinfo->progressive_mode)
/* Flush out buffered data (all we care about is counting the EOB symbol) */
emit_eobrun(entropy);
MEMZERO(did, SIZEOF(did));
for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
compptr = cinfo->cur_comp_info[ci];
if (cinfo->Ss == 0) {
if (cinfo->Ah != 0) /* DC refinement needs no table */
continue;
tbl = compptr->dc_tbl_no;
} else {
tbl = compptr->ac_tbl_no;
}
if (! did[tbl]) {
if (cinfo->Ss == 0)
htblptr = & cinfo->dc_huff_tbl_ptrs[tbl];
else
htblptr = & cinfo->ac_huff_tbl_ptrs[tbl];
if (*htblptr == NULL)
*htblptr = jpeg_alloc_huff_table((j_common_ptr) cinfo);
jpeg_gen_optimal_table(cinfo, *htblptr, entropy->count_ptrs[tbl]);
did[tbl] = TRUE;
}
}
} else {
MEMZERO(did_dc, SIZEOF(did_dc));
MEMZERO(did_ac, SIZEOF(did_ac));
for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
compptr = cinfo->cur_comp_info[ci];
dctbl = compptr->dc_tbl_no;
actbl = compptr->ac_tbl_no;
if (! did_dc[dctbl]) {
htblptr = & cinfo->dc_huff_tbl_ptrs[dctbl];
/* DC needs no table for refinement scan */
if (cinfo->Ss == 0 && cinfo->Ah == 0) {
tbl = compptr->dc_tbl_no;
if (! did_dc[tbl]) {
htblptr = & cinfo->dc_huff_tbl_ptrs[tbl];
if (*htblptr == NULL)
*htblptr = jpeg_alloc_huff_table((j_common_ptr) cinfo);
jpeg_gen_optimal_table(cinfo, *htblptr, entropy->dc_count_ptrs[dctbl]);
did_dc[dctbl] = TRUE;
jpeg_gen_optimal_table(cinfo, *htblptr, entropy->dc_count_ptrs[tbl]);
did_dc[tbl] = TRUE;
}
if (! did_ac[actbl]) {
htblptr = & cinfo->ac_huff_tbl_ptrs[actbl];
}
/* AC needs no table when not present */
if (cinfo->Se) {
tbl = compptr->ac_tbl_no;
if (! did_ac[tbl]) {
htblptr = & cinfo->ac_huff_tbl_ptrs[tbl];
if (*htblptr == NULL)
*htblptr = jpeg_alloc_huff_table((j_common_ptr) cinfo);
jpeg_gen_optimal_table(cinfo, *htblptr, entropy->ac_count_ptrs[actbl]);
did_ac[actbl] = TRUE;
jpeg_gen_optimal_table(cinfo, *htblptr, entropy->ac_count_ptrs[tbl]);
did_ac[tbl] = TRUE;
}
}
}
@ -1456,7 +1451,7 @@ METHODDEF(void)
start_pass_huff (j_compress_ptr cinfo, boolean gather_statistics)
{
huff_entropy_ptr entropy = (huff_entropy_ptr) cinfo->entropy;
int ci, dctbl, actbl, tbl;
int ci, tbl;
jpeg_component_info * compptr;
if (gather_statistics)
@ -1489,42 +1484,8 @@ start_pass_huff (j_compress_ptr cinfo, boolean gather_statistics)
}
}
/* Only DC coefficients may be interleaved, so cinfo->comps_in_scan = 1
* for AC coefficients.
*/
for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
compptr = cinfo->cur_comp_info[ci];
/* Initialize DC predictions to 0 */
entropy->saved.last_dc_val[ci] = 0;
/* Get table index */
if (cinfo->Ss == 0) {
if (cinfo->Ah != 0) /* DC refinement needs no table */
continue;
tbl = compptr->dc_tbl_no;
} else {
entropy->ac_tbl_no = tbl = compptr->ac_tbl_no;
}
if (gather_statistics) {
/* Check for invalid table index */
/* (make_c_derived_tbl does this in the other path) */
if (tbl < 0 || tbl >= NUM_HUFF_TBLS)
ERREXIT1(cinfo, JERR_NO_HUFF_TABLE, tbl);
/* Allocate and zero the statistics tables */
/* Note that jpeg_gen_optimal_table expects 257 entries in each table! */
if (entropy->count_ptrs[tbl] == NULL)
entropy->count_ptrs[tbl] = (long *)
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
257 * SIZEOF(long));
MEMZERO(entropy->count_ptrs[tbl], 257 * SIZEOF(long));
} else {
/* Compute derived values for Huffman table */
/* We may do this more than once for a table, but it's not expensive */
jpeg_make_c_derived_tbl(cinfo, cinfo->Ss == 0, tbl,
& entropy->derived_tbls[tbl]);
}
}
/* Initialize AC stuff */
entropy->ac_tbl_no = cinfo->cur_comp_info[0]->ac_tbl_no;
entropy->EOBRUN = 0;
entropy->BE = 0;
} else {
@ -1532,41 +1493,50 @@ start_pass_huff (j_compress_ptr cinfo, boolean gather_statistics)
entropy->pub.encode_mcu = encode_mcu_gather;
else
entropy->pub.encode_mcu = encode_mcu_huff;
}
for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
compptr = cinfo->cur_comp_info[ci];
dctbl = compptr->dc_tbl_no;
actbl = compptr->ac_tbl_no;
/* DC needs no table for refinement scan */
if (cinfo->Ss == 0 && cinfo->Ah == 0) {
tbl = compptr->dc_tbl_no;
if (gather_statistics) {
/* Check for invalid table indexes */
/* Check for invalid table index */
/* (make_c_derived_tbl does this in the other path) */
if (dctbl < 0 || dctbl >= NUM_HUFF_TBLS)
ERREXIT1(cinfo, JERR_NO_HUFF_TABLE, dctbl);
if (actbl < 0 || actbl >= NUM_HUFF_TBLS)
ERREXIT1(cinfo, JERR_NO_HUFF_TABLE, actbl);
if (tbl < 0 || tbl >= NUM_HUFF_TBLS)
ERREXIT1(cinfo, JERR_NO_HUFF_TABLE, tbl);
/* Allocate and zero the statistics tables */
/* Note that jpeg_gen_optimal_table expects 257 entries in each table! */
if (entropy->dc_count_ptrs[dctbl] == NULL)
entropy->dc_count_ptrs[dctbl] = (long *)
if (entropy->dc_count_ptrs[tbl] == NULL)
entropy->dc_count_ptrs[tbl] = (long *)
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
257 * SIZEOF(long));
MEMZERO(entropy->dc_count_ptrs[dctbl], 257 * SIZEOF(long));
if (entropy->ac_count_ptrs[actbl] == NULL)
entropy->ac_count_ptrs[actbl] = (long *)
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
257 * SIZEOF(long));
MEMZERO(entropy->ac_count_ptrs[actbl], 257 * SIZEOF(long));
MEMZERO(entropy->dc_count_ptrs[tbl], 257 * SIZEOF(long));
} else {
/* Compute derived values for Huffman tables */
/* We may do this more than once for a table, but it's not expensive */
jpeg_make_c_derived_tbl(cinfo, TRUE, dctbl,
& entropy->dc_derived_tbls[dctbl]);
jpeg_make_c_derived_tbl(cinfo, FALSE, actbl,
& entropy->ac_derived_tbls[actbl]);
jpeg_make_c_derived_tbl(cinfo, TRUE, tbl,
& entropy->dc_derived_tbls[tbl]);
}
/* Initialize DC predictions to 0 */
entropy->saved.last_dc_val[ci] = 0;
}
/* AC needs no table when not present */
if (cinfo->Se) {
tbl = compptr->ac_tbl_no;
if (gather_statistics) {
if (tbl < 0 || tbl >= NUM_HUFF_TBLS)
ERREXIT1(cinfo, JERR_NO_HUFF_TABLE, tbl);
if (entropy->ac_count_ptrs[tbl] == NULL)
entropy->ac_count_ptrs[tbl] = (long *)
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
257 * SIZEOF(long));
MEMZERO(entropy->ac_count_ptrs[tbl], 257 * SIZEOF(long));
} else {
jpeg_make_c_derived_tbl(cinfo, FALSE, tbl,
& entropy->ac_derived_tbls[tbl]);
}
}
}
/* Initialize bit buffer to empty */
@ -1595,18 +1565,12 @@ jinit_huff_encoder (j_compress_ptr cinfo)
cinfo->entropy = (struct jpeg_entropy_encoder *) entropy;
entropy->pub.start_pass = start_pass_huff;
if (cinfo->progressive_mode) {
/* Mark tables unallocated */
for (i = 0; i < NUM_HUFF_TBLS; i++) {
entropy->derived_tbls[i] = NULL;
entropy->count_ptrs[i] = NULL;
}
entropy->bit_buffer = NULL; /* needed only in AC refinement scan */
} else {
/* Mark tables unallocated */
for (i = 0; i < NUM_HUFF_TBLS; i++) {
entropy->dc_derived_tbls[i] = entropy->ac_derived_tbls[i] = NULL;
entropy->dc_count_ptrs[i] = entropy->ac_count_ptrs[i] = NULL;
}
}
if (cinfo->progressive_mode)
entropy->bit_buffer = NULL; /* needed only in AC refinement scan */
}

77
jcmarker.c
View File

@ -2,6 +2,7 @@
* jcmarker.c
*
* Copyright (C) 1991-1998, Thomas G. Lane.
* Modified 2003-2009 by Guido Vollbeding.
* This file is part of the Independent JPEG Group's software.
* For conditions of distribution and use, see the accompanying README file.
*
@ -153,21 +154,22 @@ emit_dqt (j_compress_ptr cinfo, int index)
ERREXIT1(cinfo, JERR_NO_QUANT_TABLE, index);
prec = 0;
for (i = 0; i < DCTSIZE2; i++) {
if (qtbl->quantval[i] > 255)
for (i = 0; i <= cinfo->lim_Se; i++) {
if (qtbl->quantval[cinfo->natural_order[i]] > 255)
prec = 1;
}
if (! qtbl->sent_table) {
emit_marker(cinfo, M_DQT);
emit_2bytes(cinfo, prec ? DCTSIZE2*2 + 1 + 2 : DCTSIZE2 + 1 + 2);
emit_2bytes(cinfo,
prec ? cinfo->lim_Se * 2 + 2 + 1 + 2 : cinfo->lim_Se + 1 + 1 + 2);
emit_byte(cinfo, index + (prec<<4));
for (i = 0; i < DCTSIZE2; i++) {
for (i = 0; i <= cinfo->lim_Se; i++) {
/* The table entries must be emitted in zigzag order. */
unsigned int qval = qtbl->quantval[jpeg_natural_order[i]];
unsigned int qval = qtbl->quantval[cinfo->natural_order[i]];
if (prec)
emit_byte(cinfo, (int) (qval >> 8));
emit_byte(cinfo, (int) (qval & 0xFF));
@ -235,7 +237,11 @@ emit_dac (j_compress_ptr cinfo)
for (i = 0; i < cinfo->comps_in_scan; i++) {
compptr = cinfo->cur_comp_info[i];
/* DC needs no table for refinement scan */
if (cinfo->Ss == 0 && cinfo->Ah == 0)
dc_in_use[compptr->dc_tbl_no] = 1;
/* AC needs no table when not present */
if (cinfo->Se)
ac_in_use[compptr->ac_tbl_no] = 1;
}
@ -320,22 +326,16 @@ emit_sos (j_compress_ptr cinfo)
for (i = 0; i < cinfo->comps_in_scan; i++) {
compptr = cinfo->cur_comp_info[i];
emit_byte(cinfo, compptr->component_id);
td = compptr->dc_tbl_no;
ta = compptr->ac_tbl_no;
if (cinfo->progressive_mode) {
/* Progressive mode: only DC or only AC tables are used in one scan;
* furthermore, Huffman coding of DC refinement uses no table at all.
* We emit 0 for unused field(s); this is recommended by the P&M text
/* We emit 0 for unused field(s); this is recommended by the P&M text
* but does not seem to be specified in the standard.
*/
if (cinfo->Ss == 0) {
ta = 0; /* DC scan */
if (cinfo->Ah != 0 && !cinfo->arith_code)
td = 0; /* no DC table either */
} else {
td = 0; /* AC scan */
}
}
/* DC needs no table for refinement scan */
td = cinfo->Ss == 0 && cinfo->Ah == 0 ? compptr->dc_tbl_no : 0;
/* AC needs no table when not present */
ta = cinfo->Se ? compptr->ac_tbl_no : 0;
emit_byte(cinfo, (td << 4) + ta);
}
@ -345,6 +345,22 @@ emit_sos (j_compress_ptr cinfo)
}
LOCAL(void)
emit_pseudo_sos (j_compress_ptr cinfo)
/* Emit a pseudo SOS marker */
{
emit_marker(cinfo, M_SOS);
emit_2bytes(cinfo, 2 + 1 + 3); /* length */
emit_byte(cinfo, 0); /* Ns */
emit_byte(cinfo, 0); /* Ss */
emit_byte(cinfo, cinfo->block_size * cinfo->block_size - 1); /* Se */
emit_byte(cinfo, 0); /* Ah/Al */
}
LOCAL(void)
emit_jfif_app0 (j_compress_ptr cinfo)
/* Emit a JFIF-compliant APP0 marker */
@ -484,7 +500,7 @@ write_file_header (j_compress_ptr cinfo)
/*
* Write frame header.
* This consists of DQT and SOFn markers.
* This consists of DQT and SOFn markers, and a conditional pseudo SOS marker.
* Note that we do not emit the SOF until we have emitted the DQT(s).
* This avoids compatibility problems with incorrect implementations that
* try to error-check the quant table numbers as soon as they see the SOF.
@ -511,7 +527,7 @@ write_frame_header (j_compress_ptr cinfo)
* Note we assume that Huffman table numbers won't be changed later.
*/
if (cinfo->arith_code || cinfo->progressive_mode ||
cinfo->data_precision != 8) {
cinfo->data_precision != 8 || cinfo->block_size != DCTSIZE) {
is_baseline = FALSE;
} else {
is_baseline = TRUE;
@ -541,6 +557,10 @@ write_frame_header (j_compress_ptr cinfo)
else
emit_sof(cinfo, M_SOF1); /* SOF code for non-baseline Huffman file */
}
/* Check to emit pseudo SOS marker */
if (cinfo->progressive_mode && cinfo->block_size != DCTSIZE)
emit_pseudo_sos(cinfo);
}
@ -569,20 +589,13 @@ write_scan_header (j_compress_ptr cinfo)
*/
for (i = 0; i < cinfo->comps_in_scan; i++) {
compptr = cinfo->cur_comp_info[i];
if (cinfo->progressive_mode) {
/* Progressive mode: only DC or only AC tables are used in one scan */
if (cinfo->Ss == 0) {
if (cinfo->Ah == 0) /* DC needs no table for refinement scan */
/* DC needs no table for refinement scan */
if (cinfo->Ss == 0 && cinfo->Ah == 0)
emit_dht(cinfo, compptr->dc_tbl_no, FALSE);
} else {
/* AC needs no table when not present */
if (cinfo->Se)
emit_dht(cinfo, compptr->ac_tbl_no, TRUE);
}
} else {
/* Sequential mode: need both DC and AC tables */
emit_dht(cinfo, compptr->dc_tbl_no, FALSE);
emit_dht(cinfo, compptr->ac_tbl_no, TRUE);
}
}
}
/* Emit DRI if required --- note that DRI value could change for each scan.

108
jcmaster.c
View File

@ -2,7 +2,7 @@
* jcmaster.c
*
* Copyright (C) 1991-1997, Thomas G. Lane.
* Modified 2003-2009 by Guido Vollbeding.
* Modified 2003-2010 by Guido Vollbeding.
* This file is part of the Independent JPEG Group's software.
* For conditions of distribution and use, see the accompanying README file.
*
@ -110,8 +110,8 @@ jpeg_calc_jpeg_dimensions (j_compress_ptr cinfo)
/* Provide 1/1 scaling */
cinfo->jpeg_width = cinfo->image_width;
cinfo->jpeg_height = cinfo->image_height;
cinfo->min_DCT_h_scaled_size = DCTSIZE;
cinfo->min_DCT_v_scaled_size = DCTSIZE;
cinfo->min_DCT_h_scaled_size = 8;
cinfo->min_DCT_v_scaled_size = 8;
} else if (cinfo->scale_num * 9 >= cinfo->scale_denom * 8) {
/* Provide 8/9 scaling */
cinfo->jpeg_width = (JDIMENSION)
@ -187,11 +187,40 @@ jpeg_calc_jpeg_dimensions (j_compress_ptr cinfo)
cinfo->min_DCT_v_scaled_size = DCTSIZE;
#endif /* DCT_SCALING_SUPPORTED */
cinfo->block_size = DCTSIZE;
cinfo->natural_order = jpeg_natural_order;
cinfo->lim_Se = DCTSIZE2-1;
}
LOCAL(void)
initial_setup (j_compress_ptr cinfo)
jpeg_calc_trans_dimensions (j_compress_ptr cinfo)
{
if (cinfo->min_DCT_h_scaled_size < 1 || cinfo->min_DCT_h_scaled_size > 16
|| cinfo->min_DCT_h_scaled_size != cinfo->min_DCT_v_scaled_size)
ERREXIT2(cinfo, JERR_BAD_DCTSIZE,
cinfo->min_DCT_h_scaled_size, cinfo->min_DCT_v_scaled_size);
cinfo->block_size = cinfo->min_DCT_h_scaled_size;
switch (cinfo->block_size) {
case 2: cinfo->natural_order = jpeg_natural_order2; break;
case 3: cinfo->natural_order = jpeg_natural_order3; break;
case 4: cinfo->natural_order = jpeg_natural_order4; break;
case 5: cinfo->natural_order = jpeg_natural_order5; break;
case 6: cinfo->natural_order = jpeg_natural_order6; break;
case 7: cinfo->natural_order = jpeg_natural_order7; break;
default: cinfo->natural_order = jpeg_natural_order; break;
}
cinfo->lim_Se = cinfo->block_size < DCTSIZE ?
cinfo->block_size * cinfo->block_size - 1 : DCTSIZE2-1;
}
LOCAL(void)
initial_setup (j_compress_ptr cinfo, boolean transcode_only)
/* Do computations that are needed before master selection phase */
{
int ci, ssize;
@ -199,11 +228,14 @@ initial_setup (j_compress_ptr cinfo)
long samplesperrow;
JDIMENSION jd_samplesperrow;
if (transcode_only)
jpeg_calc_trans_dimensions(cinfo);
else
jpeg_calc_jpeg_dimensions(cinfo);
/* Sanity check on image dimensions */
if (cinfo->jpeg_height <= 0 || cinfo->jpeg_width <= 0
|| cinfo->num_components <= 0 || cinfo->input_components <= 0)
if (cinfo->jpeg_height <= 0 || cinfo->jpeg_width <= 0 ||
cinfo->num_components <= 0 || cinfo->input_components <= 0)
ERREXIT(cinfo, JERR_EMPTY_IMAGE);
/* Make sure image isn't bigger than I can handle */
@ -278,19 +310,19 @@ initial_setup (j_compress_ptr cinfo)
/* Size in DCT blocks */
compptr->width_in_blocks = (JDIMENSION)
jdiv_round_up((long) cinfo->jpeg_width * (long) compptr->h_samp_factor,
(long) (cinfo->max_h_samp_factor * DCTSIZE));
(long) (cinfo->max_h_samp_factor * cinfo->block_size));
compptr->height_in_blocks = (JDIMENSION)
jdiv_round_up((long) cinfo->jpeg_height * (long) compptr->v_samp_factor,
(long) (cinfo->max_v_samp_factor * DCTSIZE));
(long) (cinfo->max_v_samp_factor * cinfo->block_size));
/* Size in samples */
compptr->downsampled_width = (JDIMENSION)
jdiv_round_up((long) cinfo->jpeg_width *
(long) (compptr->h_samp_factor * compptr->DCT_h_scaled_size),
(long) (cinfo->max_h_samp_factor * DCTSIZE));
(long) (cinfo->max_h_samp_factor * cinfo->block_size));
compptr->downsampled_height = (JDIMENSION)
jdiv_round_up((long) cinfo->jpeg_height *
(long) (compptr->v_samp_factor * compptr->DCT_v_scaled_size),
(long) (cinfo->max_v_samp_factor * DCTSIZE));
(long) (cinfo->max_v_samp_factor * cinfo->block_size));
/* Mark component needed (this flag isn't actually used for compression) */
compptr->component_needed = TRUE;
}
@ -300,7 +332,7 @@ initial_setup (j_compress_ptr cinfo)
*/
cinfo->total_iMCU_rows = (JDIMENSION)
jdiv_round_up((long) cinfo->jpeg_height,
(long) (cinfo->max_v_samp_factor*DCTSIZE));
(long) (cinfo->max_v_samp_factor * cinfo->block_size));
}
@ -440,6 +472,39 @@ validate_script (j_compress_ptr cinfo)
}
}
LOCAL(void)
reduce_script (j_compress_ptr cinfo)
/* Adapt scan script for use with reduced block size;
* assume that script has been validated before.
*/
{
jpeg_scan_info * scanptr;
int idxout, idxin;
/* Circumvent const declaration for this function */
scanptr = (jpeg_scan_info *) cinfo->scan_info;
idxout = 0;
for (idxin = 0; idxin < cinfo->num_scans; idxin++) {
/* After skipping, idxout becomes smaller than idxin */
if (idxin != idxout)
/* Copy rest of data;
* note we stay in given chunk of allocated memory.
*/
scanptr[idxout] = scanptr[idxin];
if (scanptr[idxout].Ss > cinfo->lim_Se)
/* Entire scan out of range - skip this entry */
continue;
if (scanptr[idxout].Se > cinfo->lim_Se)
/* Limit scan to end of block */
scanptr[idxout].Se = cinfo->lim_Se;
idxout++;
}
cinfo->num_scans = idxout;
}
#endif /* C_MULTISCAN_FILES_SUPPORTED */
@ -460,10 +525,13 @@ select_scan_parameters (j_compress_ptr cinfo)
cinfo->cur_comp_info[ci] =
&cinfo->comp_info[scanptr->component_index[ci]];
}
if (cinfo->progressive_mode) {
cinfo->Ss = scanptr->Ss;
cinfo->Se = scanptr->Se;
cinfo->Ah = scanptr->Ah;
cinfo->Al = scanptr->Al;
return;
}
}
else
#endif
@ -476,11 +544,11 @@ select_scan_parameters (j_compress_ptr cinfo)
for (ci = 0; ci < cinfo->num_components; ci++) {
cinfo->cur_comp_info[ci] = &cinfo->comp_info[ci];
}
}
cinfo->Ss = 0;
cinfo->Se = DCTSIZE2-1;
cinfo->Se = cinfo->block_size * cinfo->block_size - 1;
cinfo->Ah = 0;
cinfo->Al = 0;
}
}
@ -528,10 +596,10 @@ per_scan_setup (j_compress_ptr cinfo)
/* Overall image size in MCUs */
cinfo->MCUs_per_row = (JDIMENSION)
jdiv_round_up((long) cinfo->jpeg_width,
(long) (cinfo->max_h_samp_factor*DCTSIZE));
(long) (cinfo->max_h_samp_factor * cinfo->block_size));
cinfo->MCU_rows_in_scan = (JDIMENSION)
jdiv_round_up((long) cinfo->jpeg_height,
(long) (cinfo->max_v_samp_factor*DCTSIZE));
(long) (cinfo->max_v_samp_factor * cinfo->block_size));
cinfo->blocks_in_MCU = 0;
@ -734,11 +802,13 @@ jinit_c_master_control (j_compress_ptr cinfo, boolean transcode_only)
master->pub.is_last_pass = FALSE;
/* Validate parameters, determine derived values */
initial_setup(cinfo);
initial_setup(cinfo, transcode_only);
if (cinfo->scan_info != NULL) {
#ifdef C_MULTISCAN_FILES_SUPPORTED
validate_script(cinfo);
if (cinfo->block_size < DCTSIZE)
reduce_script(cinfo);
#else
ERREXIT(cinfo, JERR_NOT_COMPILED);
#endif
@ -747,8 +817,10 @@ jinit_c_master_control (j_compress_ptr cinfo, boolean transcode_only)
cinfo->num_scans = 1;
}
if (cinfo->progressive_mode && cinfo->arith_code == 0) /* TEMPORARY HACK ??? */
cinfo->optimize_coding = TRUE; /* assume default tables no good for progressive mode */
if ((cinfo->progressive_mode || cinfo->block_size < DCTSIZE) &&
!cinfo->arith_code) /* TEMPORARY HACK ??? */
/* assume default tables no good for progressive or downscale mode */
cinfo->optimize_coding = TRUE;
/* Initialize my private state */
if (transcode_only) {

13
jctrans.c
View File

@ -2,6 +2,7 @@
* jctrans.c
*
* Copyright (C) 1995-1998, Thomas G. Lane.
* Modified 2000-2009 by Guido Vollbeding.
* This file is part of the Independent JPEG Group's software.
* For conditions of distribution and use, see the accompanying README file.
*
@ -76,6 +77,10 @@ jpeg_copy_critical_parameters (j_decompress_ptr srcinfo,
dstinfo->image_height = srcinfo->image_height;
dstinfo->input_components = srcinfo->num_components;
dstinfo->in_color_space = srcinfo->jpeg_color_space;
dstinfo->jpeg_width = srcinfo->output_width;
dstinfo->jpeg_height = srcinfo->output_height;
dstinfo->min_DCT_h_scaled_size = srcinfo->min_DCT_h_scaled_size;
dstinfo->min_DCT_v_scaled_size = srcinfo->min_DCT_v_scaled_size;
/* Initialize all parameters to default values */
jpeg_set_defaults(dstinfo);
/* jpeg_set_defaults may choose wrong colorspace, eg YCbCr if input is RGB.
@ -158,17 +163,13 @@ LOCAL(void)
transencode_master_selection (j_compress_ptr cinfo,
jvirt_barray_ptr * coef_arrays)
{
/* Although we don't actually use input_components for transcoding,
* jcmaster.c's initial_setup will complain if input_components is 0.
*/
cinfo->input_components = 1;
/* Initialize master control (includes parameter checking/processing) */
jinit_c_master_control(cinfo, TRUE /* transcode only */);
/* Entropy encoding: either Huffman or arithmetic coding. */
if (cinfo->arith_code) {
if (cinfo->arith_code)
jinit_arith_encoder(cinfo);
} else {
else {
jinit_huff_encoder(cinfo);
}

4
jdapimin.c
View File

@ -186,8 +186,8 @@ default_decompress_parms (j_decompress_ptr cinfo)
}
/* Set defaults for other decompression parameters. */
cinfo->scale_num = DCTSIZE; /* 1:1 scaling */
cinfo->scale_denom = DCTSIZE;
cinfo->scale_num = cinfo->block_size; /* 1:1 scaling */
cinfo->scale_denom = cinfo->block_size;
cinfo->output_gamma = 1.0;
cinfo->buffered_image = FALSE;
cinfo->raw_data_out = FALSE;

82
jdarith.c
View File

@ -1,7 +1,7 @@
/*
* jdarith.c
*
* Developed 1997 by Guido Vollbeding.
* Developed 1997-2009 by Guido Vollbeding.
* This file is part of the Independent JPEG Group's software.
* For conditions of distribution and use, see the accompanying README file.
*
@ -37,6 +37,9 @@ typedef struct {
/* Pointers to statistics areas (these workspaces have image lifespan) */
unsigned char * dc_stats[NUM_ARITH_TBLS];
unsigned char * ac_stats[NUM_ARITH_TBLS];
/* Statistics bin for coding with fixed probability 0.5 */
unsigned char fixed_bin[4];
} arith_entropy_decoder;
typedef arith_entropy_decoder * arith_entropy_ptr;
@ -45,8 +48,6 @@ typedef arith_entropy_decoder * arith_entropy_ptr;
* for the statistics area.
* According to sections F.1.4.4.1.3 and F.1.4.4.2, we need at least
* 49 statistics bins for DC, and 245 statistics bins for AC coding.
* Note that we use one additional AC bin for codings with fixed
* probability (0.5), thus the minimum number for AC is 246.
*
* We use a compact representation with 1 byte per statistics bin,
* thus the numbers directly represent byte sizes.
@ -104,7 +105,6 @@ get_byte (j_decompress_ptr cinfo)
LOCAL(int)
arith_decode (j_decompress_ptr cinfo, unsigned char *st)
{
extern const INT32 jaritab[];
register arith_entropy_ptr e = (arith_entropy_ptr) cinfo->entropy;
register unsigned char nl, nm;
register INT32 qe, temp;
@ -149,7 +149,7 @@ arith_decode (j_decompress_ptr cinfo, unsigned char *st)
* Qe values and probability estimation state machine
*/
sv = *st;
qe = jaritab[sv & 0x7F]; /* => Qe_Value */
qe = jpeg_aritab[sv & 0x7F]; /* => Qe_Value */
nl = qe & 0xFF; qe >>= 8; /* Next_Index_LPS + Switch_MPS */
nm = qe & 0xFF; qe >>= 8; /* Next_Index_MPS */
@ -197,16 +197,17 @@ process_restart (j_decompress_ptr cinfo)
if (! (*cinfo->marker->read_restart_marker) (cinfo))
ERREXIT(cinfo, JERR_CANT_SUSPEND);
/* Re-initialize statistics areas */
for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
compptr = cinfo->cur_comp_info[ci];
/* Re-initialize statistics areas */
if (cinfo->progressive_mode == 0 || (cinfo->Ss == 0 && cinfo->Ah == 0)) {
if (! cinfo->progressive_mode || (cinfo->Ss == 0 && cinfo->Ah == 0)) {
MEMZERO(entropy->dc_stats[compptr->dc_tbl_no], DC_STAT_BINS);
/* Reset DC predictions to 0 */
entropy->last_dc_val[ci] = 0;
entropy->dc_context[ci] = 0;
}
if (cinfo->progressive_mode == 0 || cinfo->Ss) {
if ((! cinfo->progressive_mode && cinfo->lim_Se) ||
(cinfo->progressive_mode && cinfo->Ss)) {
MEMZERO(entropy->ac_stats[compptr->ac_tbl_no], AC_STAT_BINS);
}
}
@ -288,9 +289,9 @@ decode_mcu_DC_first (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
}
}
/* Section F.1.4.4.1.2: Establish dc_context conditioning category */
if (m < (int) (((INT32) 1 << cinfo->arith_dc_L[tbl]) >> 1))
if (m < (int) ((1L << cinfo->arith_dc_L[tbl]) >> 1))
entropy->dc_context[ci] = 0; /* zero diff category */
else if (m > (int) (((INT32) 1 << cinfo->arith_dc_U[tbl]) >> 1))
else if (m > (int) ((1L << cinfo->arith_dc_U[tbl]) >> 1))
entropy->dc_context[ci] = 12 + (sign * 4); /* large diff category */
else
entropy->dc_context[ci] = 4 + (sign * 4); /* small diff category */
@ -324,6 +325,7 @@ decode_mcu_AC_first (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
unsigned char *st;
int tbl, sign, k;
int v, m;
const int * natural_order;
/* Process restart marker if needed */
if (cinfo->restart_interval) {
@ -334,6 +336,8 @@ decode_mcu_AC_first (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
if (entropy->ct == -1) return TRUE; /* if error do nothing */
natural_order = cinfo->natural_order;
/* There is always only one block per MCU */
block = MCU_data[0];
tbl = cinfo->cur_comp_info[0]->ac_tbl_no;
@ -354,8 +358,7 @@ decode_mcu_AC_first (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
}
/* Figure F.21: Decoding nonzero value v */
/* Figure F.22: Decoding the sign of v */
entropy->ac_stats[tbl][245] = 0;
sign = arith_decode(cinfo, entropy->ac_stats[tbl] + 245);
sign = arith_decode(cinfo, entropy->fixed_bin);
st += 2;
/* Figure F.23: Decoding the magnitude category of v */
if ((m = arith_decode(cinfo, st)) != 0) {
@ -380,7 +383,7 @@ decode_mcu_AC_first (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
if (arith_decode(cinfo, st)) v |= m;
v += 1; if (sign) v = -v;
/* Scale and output coefficient in natural (dezigzagged) order */
(*block)[jpeg_natural_order[k]] = (JCOEF) (v << cinfo->Al);
(*block)[natural_order[k]] = (JCOEF) (v << cinfo->Al);
}
return TRUE;
@ -395,7 +398,7 @@ METHODDEF(boolean)
decode_mcu_DC_refine (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
{
arith_entropy_ptr entropy = (arith_entropy_ptr) cinfo->entropy;
unsigned char st[4];
unsigned char *st;
int p1, blkn;
/* Process restart marker if needed */
@ -405,12 +408,12 @@ decode_mcu_DC_refine (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
entropy->restarts_to_go--;
}
st = entropy->fixed_bin; /* use fixed probability estimation */
p1 = 1 << cinfo->Al; /* 1 in the bit position being coded */
/* Outer loop handles each block in the MCU */
for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
st[0] = 0; /* use fixed probability estimation */
/* Encoded data is simply the next bit of the two's-complement DC value */
if (arith_decode(cinfo, st))
MCU_data[blkn][0][0] |= p1;
@ -433,6 +436,7 @@ decode_mcu_AC_refine (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
unsigned char *st;
int tbl, k, kex;
int p1, m1;
const int * natural_order;
/* Process restart marker if needed */
if (cinfo->restart_interval) {
@ -443,6 +447,8 @@ decode_mcu_AC_refine (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
if (entropy->ct == -1) return TRUE; /* if error do nothing */
natural_order = cinfo->natural_order;
/* There is always only one block per MCU */
block = MCU_data[0];
tbl = cinfo->cur_comp_info[0]->ac_tbl_no;
@ -451,15 +457,15 @@ decode_mcu_AC_refine (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
m1 = (-1) << cinfo->Al; /* -1 in the bit position being coded */
/* Establish EOBx (previous stage end-of-block) index */
for (kex = cinfo->Se + 1; kex > 1; kex--)
if ((*block)[jpeg_natural_order[kex - 1]]) break;
for (kex = cinfo->Se; kex > 0; kex--)
if ((*block)[natural_order[kex]]) break;
for (k = cinfo->Ss; k <= cinfo->Se; k++) {
st = entropy->ac_stats[tbl] + 3 * (k - 1);
if (k >= kex)
if (k > kex)
if (arith_decode(cinfo, st)) break; /* EOB flag */
for (;;) {
thiscoef = *block + jpeg_natural_order[k];
thiscoef = *block + natural_order[k];
if (*thiscoef) { /* previously nonzero coef */
if (arith_decode(cinfo, st + 2)) {
if (*thiscoef < 0)
@ -470,8 +476,7 @@ decode_mcu_AC_refine (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
break;
}
if (arith_decode(cinfo, st + 1)) { /* newly nonzero coef */
entropy->ac_stats[tbl][245] = 0;
if (arith_decode(cinfo, entropy->ac_stats[tbl] + 245))
if (arith_decode(cinfo, entropy->fixed_bin))
*thiscoef = m1;
else
*thiscoef = p1;
@ -503,6 +508,7 @@ decode_mcu (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
unsigned char *st;
int blkn, ci, tbl, sign, k;
int v, m;
const int * natural_order;
/* Process restart marker if needed */
if (cinfo->restart_interval) {
@ -513,6 +519,8 @@ decode_mcu (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
if (entropy->ct == -1) return TRUE; /* if error do nothing */
natural_order = cinfo->natural_order;
/* Outer loop handles each block in the MCU */
for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
@ -548,9 +556,9 @@ decode_mcu (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
}
}
/* Section F.1.4.4.1.2: Establish dc_context conditioning category */
if (m < (int) (((INT32) 1 << cinfo->arith_dc_L[tbl]) >> 1))
if (m < (int) ((1L << cinfo->arith_dc_L[tbl]) >> 1))
entropy->dc_context[ci] = 0; /* zero diff category */
else if (m > (int) (((INT32) 1 << cinfo->arith_dc_U[tbl]) >> 1))
else if (m > (int) ((1L << cinfo->arith_dc_U[tbl]) >> 1))
entropy->dc_context[ci] = 12 + (sign * 4); /* large diff category */
else
entropy->dc_context[ci] = 4 + (sign * 4); /* small diff category */
@ -570,12 +578,12 @@ decode_mcu (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
tbl = compptr->ac_tbl_no;
/* Figure F.20: Decode_AC_coefficients */
for (k = 1; k < DCTSIZE2; k++) {
for (k = 1; k <= cinfo->lim_Se; k++) {
st = entropy->ac_stats[tbl] + 3 * (k - 1);
if (arith_decode(cinfo, st)) break; /* EOB flag */
while (arith_decode(cinfo, st + 1) == 0) {
st += 3; k++;
if (k >= DCTSIZE2) {
if (k > cinfo->lim_Se) {
WARNMS(cinfo, JWRN_ARITH_BAD_CODE);
entropy->ct = -1; /* spectral overflow */
return TRUE;
@ -583,8 +591,7 @@ decode_mcu (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
}
/* Figure F.21: Decoding nonzero value v */
/* Figure F.22: Decoding the sign of v */
entropy->ac_stats[tbl][245] = 0;
sign = arith_decode(cinfo, entropy->ac_stats[tbl] + 245);
sign = arith_decode(cinfo, entropy->fixed_bin);
st += 2;
/* Figure F.23: Decoding the magnitude category of v */
if ((m = arith_decode(cinfo, st)) != 0) {
@ -608,7 +615,7 @@ decode_mcu (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
while (m >>= 1)
if (arith_decode(cinfo, st)) v |= m;
v += 1; if (sign) v = -v;
(*block)[jpeg_natural_order[k]] = (JCOEF) v;
(*block)[natural_order[k]] = (JCOEF) v;
}
}
@ -634,7 +641,7 @@ start_pass (j_decompress_ptr cinfo)
goto bad;
} else {
/* need not check Ss/Se < 0 since they came from unsigned bytes */
if (cinfo->Se < cinfo->Ss || cinfo->Se >= DCTSIZE2)
if (cinfo->Se < cinfo->Ss || cinfo->Se > cinfo->lim_Se)
goto bad;
/* AC scans may have only one component */
if (cinfo->comps_in_scan != 1)
@ -680,20 +687,19 @@ start_pass (j_decompress_ptr cinfo)
}
} else {
/* Check that the scan parameters Ss, Se, Ah/Al are OK for sequential JPEG.
* This ought to be an error condition, but we make it a warning because
* there are some baseline files out there with all zeroes in these bytes.
* This ought to be an error condition, but we make it a warning.
*/
if (cinfo->Ss != 0 || cinfo->Se != DCTSIZE2-1 ||
cinfo->Ah != 0 || cinfo->Al != 0)
if (cinfo->Ss != 0 || cinfo->Ah != 0 || cinfo->Al != 0 ||
(cinfo->Se < DCTSIZE2 && cinfo->Se != cinfo->lim_Se))
WARNMS(cinfo, JWRN_NOT_SEQUENTIAL);
/* Select MCU decoding routine */
entropy->pub.decode_mcu = decode_mcu;
}
/* Allocate & initialize requested statistics areas */
for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
compptr = cinfo->cur_comp_info[ci];
/* Allocate & initialize requested statistics areas */
if (cinfo->progressive_mode == 0 || (cinfo->Ss == 0 && cinfo->Ah == 0)) {
if (! cinfo->progressive_mode || (cinfo->Ss == 0 && cinfo->Ah == 0)) {
tbl = compptr->dc_tbl_no;
if (tbl < 0 || tbl >= NUM_ARITH_TBLS)
ERREXIT1(cinfo, JERR_NO_ARITH_TABLE, tbl);
@ -705,7 +711,8 @@ start_pass (j_decompress_ptr cinfo)
entropy->last_dc_val[ci] = 0;
entropy->dc_context[ci] = 0;
}
if (cinfo->progressive_mode == 0 || cinfo->Ss) {
if ((! cinfo->progressive_mode && cinfo->lim_Se) ||
(cinfo->progressive_mode && cinfo->Ss)) {
tbl = compptr->ac_tbl_no;
if (tbl < 0 || tbl >= NUM_ARITH_TBLS)
ERREXIT1(cinfo, JERR_NO_ARITH_TABLE, tbl);
@ -748,6 +755,9 @@ jinit_arith_decoder (j_decompress_ptr cinfo)
entropy->ac_stats[i] = NULL;
}
/* Initialize index for fixed probability estimation */
entropy->fixed_bin[0] = 113;
if (cinfo->progressive_mode) {
/* Create progression status table */
int *coef_bit_ptr, ci;

122
jdatadst.c
View File

@ -2,13 +2,14 @@
* jdatadst.c
*
* Copyright (C) 1994-1996, Thomas G. Lane.
* Modified 2009 by Guido Vollbeding.
* This file is part of the Independent JPEG Group's software.
* For conditions of distribution and use, see the accompanying README file.
*
* This file contains compression data destination routines for the case of
* emitting JPEG data to a file (or any stdio stream). While these routines
* are sufficient for most applications, some will want to use a different
* destination manager.
* emitting JPEG data to memory or to a file (or any stdio stream).
* While these routines are sufficient for most applications,
* some will want to use a different destination manager.
* IMPORTANT: we assume that fwrite() will correctly transcribe an array of
* JOCTETs into 8-bit-wide elements on external storage. If char is wider
* than 8 bits on your machine, you may need to do some tweaking.
@ -19,6 +20,11 @@
#include "jpeglib.h"
#include "jerror.h"
#ifndef HAVE_STDLIB_H /* <stdlib.h> should declare malloc(),free() */
extern void * malloc JPP((size_t size));
extern void free JPP((void *ptr));
#endif
/* Expanded data destination object for stdio output */
@ -34,6 +40,21 @@ typedef my_destination_mgr * my_dest_ptr;
#define OUTPUT_BUF_SIZE 4096 /* choose an efficiently fwrite'able size */
/* Expanded data destination object for memory output */
typedef struct {
struct jpeg_destination_mgr pub; /* public fields */
unsigned char ** outbuffer; /* target buffer */
unsigned long * outsize;
unsigned char * newbuffer; /* newly allocated buffer */
JOCTET * buffer; /* start of buffer */
size_t bufsize;
} my_mem_destination_mgr;
typedef my_mem_destination_mgr * my_mem_dest_ptr;
/*
* Initialize destination --- called by jpeg_start_compress
* before any data is actually written.
@ -53,6 +74,12 @@ init_destination (j_compress_ptr cinfo)
dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
}
METHODDEF(void)
init_mem_destination (j_compress_ptr cinfo)
{
/* no work necessary here */
}
/*
* Empty the output buffer --- called whenever buffer fills up.
@ -92,6 +119,36 @@ empty_output_buffer (j_compress_ptr cinfo)
return TRUE;
}
METHODDEF(boolean)
empty_mem_output_buffer (j_compress_ptr cinfo)
{
size_t nextsize;
JOCTET * nextbuffer;
my_mem_dest_ptr dest = (my_mem_dest_ptr) cinfo->dest;
/* Try to allocate new buffer with double size */
nextsize = dest->bufsize * 2;
nextbuffer = malloc(nextsize);
if (nextbuffer == NULL)
ERREXIT1(cinfo, JERR_OUT_OF_MEMORY, 10);
MEMCOPY(nextbuffer, dest->buffer, dest->bufsize);
if (dest->newbuffer != NULL)
free(dest->newbuffer);
dest->newbuffer = nextbuffer;
dest->pub.next_output_byte = nextbuffer + dest->bufsize;
dest->pub.free_in_buffer = dest->bufsize;
dest->buffer = nextbuffer;
dest->bufsize = nextsize;
return TRUE;
}
/*
* Terminate destination --- called by jpeg_finish_compress
@ -119,6 +176,15 @@ term_destination (j_compress_ptr cinfo)
ERREXIT(cinfo, JERR_FILE_WRITE);
}
METHODDEF(void)
term_mem_destination (j_compress_ptr cinfo)
{
my_mem_dest_ptr dest = (my_mem_dest_ptr) cinfo->dest;
*dest->outbuffer = dest->buffer;
*dest->outsize = dest->bufsize - dest->pub.free_in_buffer;
}
/*
* Prepare for output to a stdio stream.
@ -149,3 +215,53 @@ jpeg_stdio_dest (j_compress_ptr cinfo, FILE * outfile)
dest->pub.term_destination = term_destination;
dest->outfile = outfile;
}
/*
* Prepare for output to a memory buffer.
* The caller may supply an own initial buffer with appropriate size.
* Otherwise, or when the actual data output exceeds the given size,
* the library adapts the buffer size as necessary.
* The standard library functions malloc/free are used for allocating
* larger memory, so the buffer is available to the application after
* finishing compression, and then the application is responsible for
* freeing the requested memory.
*/
GLOBAL(void)
jpeg_mem_dest (j_compress_ptr cinfo,
unsigned char ** outbuffer, unsigned long * outsize)
{
my_mem_dest_ptr dest;
if (outbuffer == NULL || outsize == NULL) /* sanity check */
ERREXIT(cinfo, JERR_BUFFER_SIZE);
/* The destination object is made permanent so that multiple JPEG images
* can be written to the same buffer without re-executing jpeg_mem_dest.
*/
if (cinfo->dest == NULL) { /* first time for this JPEG object? */
cinfo->dest = (struct jpeg_destination_mgr *)
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
SIZEOF(my_mem_destination_mgr));
}
dest = (my_mem_dest_ptr) cinfo->dest;
dest->pub.init_destination = init_mem_destination;
dest->pub.empty_output_buffer = empty_mem_output_buffer;
dest->pub.term_destination = term_mem_destination;
dest->outbuffer = outbuffer;
dest->outsize = outsize;
dest->newbuffer = NULL;
if (*outbuffer == NULL || *outsize == 0) {
/* Allocate initial buffer */
dest->newbuffer = *outbuffer = malloc(OUTPUT_BUF_SIZE);
if (dest->newbuffer == NULL)
ERREXIT1(cinfo, JERR_OUT_OF_MEMORY, 10);
*outsize = OUTPUT_BUF_SIZE;
}
dest->pub.next_output_byte = dest->buffer = *outbuffer;
dest->pub.free_in_buffer = dest->bufsize = *outsize;
}

78
jdatasrc.c
View File

@ -2,13 +2,14 @@
* jdatasrc.c
*
* Copyright (C) 1994-1996, Thomas G. Lane.
* Modified 2009 by Guido Vollbeding.
* This file is part of the Independent JPEG Group's software.
* For conditions of distribution and use, see the accompanying README file.
*
* This file contains decompression data source routines for the case of
* reading JPEG data from a file (or any stdio stream). While these routines
* are sufficient for most applications, some will want to use a different
* source manager.
* reading JPEG data from memory or from a file (or any stdio stream).
* While these routines are sufficient for most applications,
* some will want to use a different source manager.
* IMPORTANT: we assume that fread() will correctly transcribe an array of
* JOCTETs from 8-bit-wide elements on external storage. If char is wider
* than 8 bits on your machine, you may need to do some tweaking.
@ -52,6 +53,12 @@ init_source (j_decompress_ptr cinfo)
src->start_of_file = TRUE;
}
METHODDEF(void)
init_mem_source (j_decompress_ptr cinfo)
{
/* no work necessary here */
}
/*
* Fill the input buffer --- called whenever buffer is emptied.
@ -111,6 +118,26 @@ fill_input_buffer (j_decompress_ptr cinfo)
return TRUE;
}
METHODDEF(boolean)
fill_mem_input_buffer (j_decompress_ptr cinfo)
{
static JOCTET mybuffer[4];
/* The whole JPEG data is expected to reside in the supplied memory
* buffer, so any request for more data beyond the given buffer size
* is treated as an error.
*/
WARNMS(cinfo, JWRN_JPEG_EOF);
/* Insert a fake EOI marker */
mybuffer[0] = (JOCTET) 0xFF;
mybuffer[1] = (JOCTET) JPEG_EOI;
cinfo->src->next_input_byte = mybuffer;
cinfo->src->bytes_in_buffer = 2;
return TRUE;
}
/*
* Skip data --- used to skip over a potentially large amount of
@ -127,22 +154,22 @@ fill_input_buffer (j_decompress_ptr cinfo)
METHODDEF(void)
skip_input_data (j_decompress_ptr cinfo, long num_bytes)
{
my_src_ptr src = (my_src_ptr) cinfo->src;
struct jpeg_source_mgr * src = cinfo->src;
/* Just a dumb implementation for now. Could use fseek() except
* it doesn't work on pipes. Not clear that being smart is worth
* any trouble anyway --- large skips are infrequent.
*/
if (num_bytes > 0) {
while (num_bytes > (long) src->pub.bytes_in_buffer) {
num_bytes -= (long) src->pub.bytes_in_buffer;
while (num_bytes > (long) src->bytes_in_buffer) {
num_bytes -= (long) src->bytes_in_buffer;
(void) fill_input_buffer(cinfo);
/* note we assume that fill_input_buffer will never return FALSE,
* so suspension need not be handled.
*/
}
src->pub.next_input_byte += (size_t) num_bytes;
src->pub.bytes_in_buffer -= (size_t) num_bytes;
src->next_input_byte += (size_t) num_bytes;
src->bytes_in_buffer -= (size_t) num_bytes;
}
}
@ -210,3 +237,38 @@ jpeg_stdio_src (j_decompress_ptr cinfo, FILE * infile)
src->pub.bytes_in_buffer = 0; /* forces fill_input_buffer on first read */
src->pub.next_input_byte = NULL; /* until buffer loaded */
}
/*
* Prepare for input from a supplied memory buffer.
* The buffer must contain the whole JPEG data.
*/
GLOBAL(void)
jpeg_mem_src (j_decompress_ptr cinfo,
unsigned char * inbuffer, unsigned long insize)
{
struct jpeg_source_mgr * src;
if (inbuffer == NULL || insize == 0) /* Treat empty input as fatal error */
ERREXIT(cinfo, JERR_INPUT_EMPTY);
/* The source object is made permanent so that a series of JPEG images
* can be read from the same buffer by calling jpeg_mem_src only before
* the first one.
*/
if (cinfo->src == NULL) { /* first time for this JPEG object? */
cinfo->src = (struct jpeg_source_mgr *)
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
SIZEOF(struct jpeg_source_mgr));
}
src = cinfo->src;
src->init_source = init_mem_source;
src->fill_input_buffer = fill_mem_input_buffer;
src->skip_input_data = skip_input_data;
src->resync_to_restart = jpeg_resync_to_restart; /* use default method */
src->term_source = term_source;
src->bytes_in_buffer = (size_t) insize;
src->next_input_byte = (JOCTET *) inbuffer;
}

304
jdhuff.c
View File

@ -229,6 +229,7 @@ typedef struct {
savable_state saved; /* Other state at start of MCU */
/* These fields are NOT loaded into local working state. */
boolean insufficient_data; /* set TRUE after emitting warning */
unsigned int restarts_to_go; /* MCUs left in this restart interval */
/* Following two fields used only in progressive mode */
@ -267,6 +268,51 @@ static const int jpeg_zigzag_order[8][8] = {
{ 35, 36, 48, 49, 57, 58, 62, 63 }
};
static const int jpeg_zigzag_order7[7][7] = {
{ 0, 1, 5, 6, 14, 15, 27 },
{ 2, 4, 7, 13, 16, 26, 28 },
{ 3, 8, 12, 17, 25, 29, 38 },
{ 9, 11, 18, 24, 30, 37, 39 },
{ 10, 19, 23, 31, 36, 40, 45 },
{ 20, 22, 32, 35, 41, 44, 46 },
{ 21, 33, 34, 42, 43, 47, 48 }
};
static const int jpeg_zigzag_order6[6][6] = {
{ 0, 1, 5, 6, 14, 15 },
{ 2, 4, 7, 13, 16, 25 },
{ 3, 8, 12, 17, 24, 26 },
{ 9, 11, 18, 23, 27, 32 },
{ 10, 19, 22, 28, 31, 33 },
{ 20, 21, 29, 30, 34, 35 }
};
static const int jpeg_zigzag_order5[5][5] = {
{ 0, 1, 5, 6, 14 },
{ 2, 4, 7, 13, 15 },
{ 3, 8, 12, 16, 21 },
{ 9, 11, 17, 20, 22 },
{ 10, 18, 19, 23, 24 }
};
static const int jpeg_zigzag_order4[4][4] = {
{ 0, 1, 5, 6 },
{ 2, 4, 7, 12 },
{ 3, 8, 11, 13 },
{ 9, 10, 14, 15 }
};
static const int jpeg_zigzag_order3[3][3] = {
{ 0, 1, 5 },
{ 2, 4, 6 },
{ 3, 7, 8 }
};
static const int jpeg_zigzag_order2[2][2] = {
{ 0, 1 },
{ 2, 3 }
};
/*
* Compute the derived values for a Huffman table.
@ -496,9 +542,9 @@ jpeg_fill_bit_buffer (bitread_working_state * state,
* We use a nonvolatile flag to ensure that only one warning message
* appears per data segment.
*/
if (! cinfo->entropy->insufficient_data) {
if (! ((huff_entropy_ptr) cinfo->entropy)->insufficient_data) {
WARNMS(cinfo, JWRN_HIT_MARKER);
cinfo->entropy->insufficient_data = TRUE;
((huff_entropy_ptr) cinfo->entropy)->insufficient_data = TRUE;
}
/* Fill the buffer with zero bits */
get_buffer <<= MIN_GET_BITS - bits_left;
@ -616,7 +662,7 @@ process_restart (j_decompress_ptr cinfo)
* leaving the flag set.
*/
if (cinfo->unread_marker == 0)
entropy->pub.insufficient_data = FALSE;
entropy->insufficient_data = FALSE;
return TRUE;
}
@ -668,7 +714,7 @@ decode_mcu_DC_first (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
/* If we've run out of data, just leave the MCU set to zeroes.
* This way, we return uniform gray for the remainder of the segment.
*/
if (! entropy->pub.insufficient_data) {
if (! entropy->insufficient_data) {
/* Load up working state */
BITREAD_LOAD_STATE(cinfo,entropy->bitstate);
@ -720,10 +766,10 @@ METHODDEF(boolean)
decode_mcu_AC_first (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
{
huff_entropy_ptr entropy = (huff_entropy_ptr) cinfo->entropy;
int Se = cinfo->Se;
int Al = cinfo->Al;
register int s, k, r;
unsigned int EOBRUN;
int Se, Al;
const int * natural_order;
JBLOCKROW block;
BITREAD_STATE_VARS;
d_derived_tbl * tbl;
@ -738,7 +784,11 @@ decode_mcu_AC_first (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
/* If we've run out of data, just leave the MCU set to zeroes.
* This way, we return uniform gray for the remainder of the segment.
*/
if (! entropy->pub.insufficient_data) {
if (! entropy->insufficient_data) {
Se = cinfo->Se;
Al = cinfo->Al;
natural_order = cinfo->natural_order;
/* Load up working state.
* We can avoid loading/saving bitread state if in an EOB run.
@ -764,7 +814,7 @@ decode_mcu_AC_first (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
r = GET_BITS(s);
s = HUFF_EXTEND(r, s);
/* Scale and output coefficient in natural (dezigzagged) order */
(*block)[jpeg_natural_order[k]] = (JCOEF) (s << Al);
(*block)[natural_order[k]] = (JCOEF) (s << Al);
} else {
if (r == 15) { /* ZRL */
k += 15; /* skip 15 zeroes in band */
@ -854,11 +904,10 @@ METHODDEF(boolean)
decode_mcu_AC_refine (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
{
huff_entropy_ptr entropy = (huff_entropy_ptr) cinfo->entropy;
int Se = cinfo->Se;
int p1 = 1 << cinfo->Al; /* 1 in the bit position being coded */
int m1 = (-1) << cinfo->Al; /* -1 in the bit position being coded */
register int s, k, r;
unsigned int EOBRUN;
int Se, p1, m1;
const int * natural_order;
JBLOCKROW block;
JCOEFPTR thiscoef;
BITREAD_STATE_VARS;
@ -875,7 +924,12 @@ decode_mcu_AC_refine (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
/* If we've run out of data, don't modify the MCU.
*/
if (! entropy->pub.insufficient_data) {
if (! entropy->insufficient_data) {
Se = cinfo->Se;
p1 = 1 << cinfo->Al; /* 1 in the bit position being coded */
m1 = (-1) << cinfo->Al; /* -1 in the bit position being coded */
natural_order = cinfo->natural_order;
/* Load up working state */
BITREAD_LOAD_STATE(cinfo,entropy->bitstate);
@ -926,7 +980,7 @@ decode_mcu_AC_refine (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
* if the absolute value of the coefficient must be increased.
*/
do {
thiscoef = *block + jpeg_natural_order[k];
thiscoef = *block + natural_order[k];
if (*thiscoef != 0) {
CHECK_BIT_BUFFER(br_state, 1, goto undoit);
if (GET_BITS(1)) {
@ -944,7 +998,7 @@ decode_mcu_AC_refine (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
k++;
} while (k <= Se);
if (s) {
int pos = jpeg_natural_order[k];
int pos = natural_order[k];
/* Output newly nonzero coefficient */
(*block)[pos] = (JCOEF) s;
/* Remember its position in case we have to suspend */
@ -960,7 +1014,7 @@ decode_mcu_AC_refine (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
* if the absolute value of the coefficient must be increased.
*/
for (; k <= Se; k++) {
thiscoef = *block + jpeg_natural_order[k];
thiscoef = *block + natural_order[k];
if (*thiscoef != 0) {
CHECK_BIT_BUFFER(br_state, 1, goto undoit);
if (GET_BITS(1)) {
@ -997,7 +1051,136 @@ undoit:
/*
* Decode one MCU's worth of Huffman-compressed coefficients.
* Decode one MCU's worth of Huffman-compressed coefficients,
* partial blocks.
*/
METHODDEF(boolean)
decode_mcu_sub (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
{
huff_entropy_ptr entropy = (huff_entropy_ptr) cinfo->entropy;
const int * natural_order;
int Se, blkn;
BITREAD_STATE_VARS;
savable_state state;
/* Process restart marker if needed; may have to suspend */
if (cinfo->restart_interval) {
if (entropy->restarts_to_go == 0)
if (! process_restart(cinfo))
return FALSE;
}
/* If we've run out of data, just leave the MCU set to zeroes.
* This way, we return uniform gray for the remainder of the segment.
*/
if (! entropy->insufficient_data) {
natural_order = cinfo->natural_order;
Se = cinfo->lim_Se;
/* Load up working state */
BITREAD_LOAD_STATE(cinfo,entropy->bitstate);
ASSIGN_STATE(state, entropy->saved);
/* Outer loop handles each block in the MCU */
for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
JBLOCKROW block = MCU_data[blkn];
d_derived_tbl * htbl;
register int s, k, r;
int coef_limit, ci;
/* Decode a single block's worth of coefficients */
/* Section F.2.2.1: decode the DC coefficient difference */
htbl = entropy->dc_cur_tbls[blkn];
HUFF_DECODE(s, br_state, htbl, return FALSE, label1);
htbl = entropy->ac_cur_tbls[blkn];
k = 1;
coef_limit = entropy->coef_limit[blkn];
if (coef_limit) {
/* Convert DC difference to actual value, update last_dc_val */
if (s) {
CHECK_BIT_BUFFER(br_state, s, return FALSE);
r = GET_BITS(s);
s = HUFF_EXTEND(r, s);
}
ci = cinfo->MCU_membership[blkn];
s += state.last_dc_val[ci];
state.last_dc_val[ci] = s;
/* Output the DC coefficient */
(*block)[0] = (JCOEF) s;
/* Section F.2.2.2: decode the AC coefficients */
/* Since zeroes are skipped, output area must be cleared beforehand */
for (; k < coef_limit; k++) {
HUFF_DECODE(s, br_state, htbl, return FALSE, label2);
r = s >> 4;
s &= 15;
if (s) {
k += r;
CHECK_BIT_BUFFER(br_state, s, return FALSE);
r = GET_BITS(s);
s = HUFF_EXTEND(r, s);
/* Output coefficient in natural (dezigzagged) order.
* Note: the extra entries in natural_order[] will save us
* if k > Se, which could happen if the data is corrupted.
*/
(*block)[natural_order[k]] = (JCOEF) s;
} else {
if (r != 15)
goto EndOfBlock;
k += 15;
}
}
} else {
if (s) {
CHECK_BIT_BUFFER(br_state, s, return FALSE);
DROP_BITS(s);
}
}
/* Section F.2.2.2: decode the AC coefficients */
/* In this path we just discard the values */
for (; k <= Se; k++) {
HUFF_DECODE(s, br_state, htbl, return FALSE, label3);
r = s >> 4;
s &= 15;
if (s) {
k += r;
CHECK_BIT_BUFFER(br_state, s, return FALSE);
DROP_BITS(s);
} else {
if (r != 15)
break;
k += 15;
}
}
EndOfBlock: ;
}
/* Completed MCU, so update state */
BITREAD_SAVE_STATE(cinfo,entropy->bitstate);
ASSIGN_STATE(entropy->saved, state);
}
/* Account for restart interval (no-op if not using restarts) */
entropy->restarts_to_go--;
return TRUE;
}
/*
* Decode one MCU's worth of Huffman-compressed coefficients,
* full-size blocks.
*/
METHODDEF(boolean)
@ -1018,7 +1201,7 @@ decode_mcu (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
/* If we've run out of data, just leave the MCU set to zeroes.
* This way, we return uniform gray for the remainder of the segment.
*/
if (! entropy->pub.insufficient_data) {
if (! entropy->insufficient_data) {
/* Load up working state */
BITREAD_LOAD_STATE(cinfo,entropy->bitstate);
@ -1127,7 +1310,7 @@ METHODDEF(void)
start_pass_huff_decoder (j_decompress_ptr cinfo)
{
huff_entropy_ptr entropy = (huff_entropy_ptr) cinfo->entropy;
int ci, blkn, dctbl, actbl, i;
int ci, blkn, tbl, i;
jpeg_component_info * compptr;
if (cinfo->progressive_mode) {
@ -1137,7 +1320,7 @@ start_pass_huff_decoder (j_decompress_ptr cinfo)
goto bad;
} else {
/* need not check Ss/Se < 0 since they came from unsigned bytes */
if (cinfo->Se < cinfo->Ss || cinfo->Se >= DCTSIZE2)
if (cinfo->Se < cinfo->Ss || cinfo->Se > cinfo->lim_Se)
goto bad;
/* AC scans may have only one component */
if (cinfo->comps_in_scan != 1)
@ -1196,16 +1379,16 @@ start_pass_huff_decoder (j_decompress_ptr cinfo)
*/
if (cinfo->Ss == 0) {
if (cinfo->Ah == 0) { /* DC refinement needs no table */
i = compptr->dc_tbl_no;
jpeg_make_d_derived_tbl(cinfo, TRUE, i,
& entropy->derived_tbls[i]);
tbl = compptr->dc_tbl_no;
jpeg_make_d_derived_tbl(cinfo, TRUE, tbl,
& entropy->derived_tbls[tbl]);
}
} else {
i = compptr->ac_tbl_no;
jpeg_make_d_derived_tbl(cinfo, FALSE, i,
& entropy->derived_tbls[i]);
tbl = compptr->ac_tbl_no;
jpeg_make_d_derived_tbl(cinfo, FALSE, tbl,
& entropy->derived_tbls[tbl]);
/* remember the single active table */
entropy->ac_derived_tbl = entropy->derived_tbls[i];
entropy->ac_derived_tbl = entropy->derived_tbls[tbl];
}
/* Initialize DC predictions to 0 */
entropy->saved.last_dc_val[ci] = 0;
@ -1218,23 +1401,35 @@ start_pass_huff_decoder (j_decompress_ptr cinfo)
* This ought to be an error condition, but we make it a warning because
* there are some baseline files out there with all zeroes in these bytes.
*/
if (cinfo->Ss != 0 || cinfo->Se != DCTSIZE2-1 ||
cinfo->Ah != 0 || cinfo->Al != 0)
if (cinfo->Ss != 0 || cinfo->Ah != 0 || cinfo->Al != 0 ||
((cinfo->is_baseline || cinfo->Se < DCTSIZE2) &&
cinfo->Se != cinfo->lim_Se))
WARNMS(cinfo, JWRN_NOT_SEQUENTIAL);
/* Select MCU decoding routine */
/* We retain the hard-coded case for full-size blocks.
* This is not necessary, but it appears that this version is slightly
* more performant in the given implementation.
* With an improved implementation we would prefer a single optimized
* function.
*/
if (cinfo->lim_Se != DCTSIZE2-1)
entropy->pub.decode_mcu = decode_mcu_sub;
else
entropy->pub.decode_mcu = decode_mcu;
for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
compptr = cinfo->cur_comp_info[ci];
dctbl = compptr->dc_tbl_no;
actbl = compptr->ac_tbl_no;
/* Compute derived values for Huffman tables */
/* We may do this more than once for a table, but it's not expensive */
jpeg_make_d_derived_tbl(cinfo, TRUE, dctbl,
& entropy->dc_derived_tbls[dctbl]);
jpeg_make_d_derived_tbl(cinfo, FALSE, actbl,
& entropy->ac_derived_tbls[actbl]);
tbl = compptr->dc_tbl_no;
jpeg_make_d_derived_tbl(cinfo, TRUE, tbl,
& entropy->dc_derived_tbls[tbl]);
if (cinfo->lim_Se) { /* AC needs no table when not present */
tbl = compptr->ac_tbl_no;
jpeg_make_d_derived_tbl(cinfo, FALSE, tbl,
& entropy->ac_derived_tbls[tbl]);
}
/* Initialize DC predictions to 0 */
entropy->saved.last_dc_val[ci] = 0;
}
@ -1249,10 +1444,47 @@ start_pass_huff_decoder (j_decompress_ptr cinfo)
/* Decide whether we really care about the coefficient values */
if (compptr->component_needed) {
ci = compptr->DCT_v_scaled_size;
if (ci <= 0 || ci > 8) ci = 8;
i = compptr->DCT_h_scaled_size;
switch (cinfo->lim_Se) {
case (1*1-1):
entropy->coef_limit[blkn] = 1;
break;
case (2*2-1):
if (ci <= 0 || ci > 2) ci = 2;
if (i <= 0 || i > 2) i = 2;
entropy->coef_limit[blkn] = 1 + jpeg_zigzag_order2[ci - 1][i - 1];
break;
case (3*3-1):
if (ci <= 0 || ci > 3) ci = 3;
if (i <= 0 || i > 3) i = 3;
entropy->coef_limit[blkn] = 1 + jpeg_zigzag_order3[ci - 1][i - 1];
break;
case (4*4-1):
if (ci <= 0 || ci > 4) ci = 4;
if (i <= 0 || i > 4) i = 4;
entropy->coef_limit[blkn] = 1 + jpeg_zigzag_order4[ci - 1][i - 1];
break;
case (5*5-1):
if (ci <= 0 || ci > 5) ci = 5;
if (i <= 0 || i > 5) i = 5;
entropy->coef_limit[blkn] = 1 + jpeg_zigzag_order5[ci - 1][i - 1];
break;
case (6*6-1):
if (ci <= 0 || ci > 6) ci = 6;
if (i <= 0 || i > 6) i = 6;
entropy->coef_limit[blkn] = 1 + jpeg_zigzag_order6[ci - 1][i - 1];
break;
case (7*7-1):
if (ci <= 0 || ci > 7) ci = 7;
if (i <= 0 || i > 7) i = 7;
entropy->coef_limit[blkn] = 1 + jpeg_zigzag_order7[ci - 1][i - 1];
break;
default:
if (ci <= 0 || ci > 8) ci = 8;
if (i <= 0 || i > 8) i = 8;
entropy->coef_limit[blkn] = 1 + jpeg_zigzag_order[ci - 1][i - 1];
break;
}
} else {
entropy->coef_limit[blkn] = 0;
}
@ -1262,7 +1494,7 @@ start_pass_huff_decoder (j_decompress_ptr cinfo)
/* Initialize bitread state variables */
entropy->bitstate.bits_left = 0;
entropy->bitstate.get_buffer = 0; /* unnecessary, but keeps Purify quiet */
entropy->pub.insufficient_data = FALSE;
entropy->insufficient_data = FALSE;
/* Initialize restart counter */
entropy->restarts_to_go = cinfo->restart_interval;

321
jdinput.c
View File

@ -22,7 +22,7 @@
typedef struct {
struct jpeg_input_controller pub; /* public fields */
boolean inheaders; /* TRUE until first SOS is reached */
int inheaders; /* Nonzero until first SOS is reached */
} my_input_controller;
typedef my_input_controller * my_inputctl_ptr;
@ -36,6 +36,174 @@ METHODDEF(int) consume_markers JPP((j_decompress_ptr cinfo));
* Routines to calculate various quantities related to the size of the image.
*/
/*
* Compute output image dimensions and related values.
* NOTE: this is exported for possible use by application.
* Hence it mustn't do anything that can't be done twice.
*/
GLOBAL(void)
jpeg_core_output_dimensions (j_decompress_ptr cinfo)
/* Do computations that are needed before master selection phase.
* This function is used for transcoding and full decompression.
*/
{
#ifdef IDCT_SCALING_SUPPORTED
int ci;
jpeg_component_info *compptr;
/* Compute actual output image dimensions and DCT scaling choices. */
if (cinfo->scale_num * cinfo->block_size <= cinfo->scale_denom) {
/* Provide 1/block_size scaling */
cinfo->output_width = (JDIMENSION)
jdiv_round_up((long) cinfo->image_width, (long) cinfo->block_size);
cinfo->output_height = (JDIMENSION)
jdiv_round_up((long) cinfo->image_height, (long) cinfo->block_size);
cinfo->min_DCT_h_scaled_size = 1;
cinfo->min_DCT_v_scaled_size = 1;
} else if (cinfo->scale_num * cinfo->block_size <= cinfo->scale_denom * 2) {
/* Provide 2/block_size scaling */
cinfo->output_width = (JDIMENSION)
jdiv_round_up((long) cinfo->image_width * 2L, (long) cinfo->block_size);
cinfo->output_height = (JDIMENSION)
jdiv_round_up((long) cinfo->image_height * 2L, (long) cinfo->block_size);
cinfo->min_DCT_h_scaled_size = 2;
cinfo->min_DCT_v_scaled_size = 2;
} else if (cinfo->scale_num * cinfo->block_size <= cinfo->scale_denom * 3) {
/* Provide 3/block_size scaling */
cinfo->output_width = (JDIMENSION)
jdiv_round_up((long) cinfo->image_width * 3L, (long) cinfo->block_size);
cinfo->output_height = (JDIMENSION)
jdiv_round_up((long) cinfo->image_height * 3L, (long) cinfo->block_size);
cinfo->min_DCT_h_scaled_size = 3;
cinfo->min_DCT_v_scaled_size = 3;
} else if (cinfo->scale_num * cinfo->block_size <= cinfo->scale_denom * 4) {
/* Provide 4/block_size scaling */
cinfo->output_width = (JDIMENSION)
jdiv_round_up((long) cinfo->image_width * 4L, (long) cinfo->block_size);
cinfo->output_height = (JDIMENSION)
jdiv_round_up((long) cinfo->image_height * 4L, (long) cinfo->block_size);
cinfo->min_DCT_h_scaled_size = 4;
cinfo->min_DCT_v_scaled_size = 4;
} else if (cinfo->scale_num * cinfo->block_size <= cinfo->scale_denom * 5) {
/* Provide 5/block_size scaling */
cinfo->output_width = (JDIMENSION)
jdiv_round_up((long) cinfo->image_width * 5L, (long) cinfo->block_size);
cinfo->output_height = (JDIMENSION)
jdiv_round_up((long) cinfo->image_height * 5L, (long) cinfo->block_size);
cinfo->min_DCT_h_scaled_size = 5;
cinfo->min_DCT_v_scaled_size = 5;
} else if (cinfo->scale_num * cinfo->block_size <= cinfo->scale_denom * 6) {
/* Provide 6/block_size scaling */
cinfo->output_width = (JDIMENSION)
jdiv_round_up((long) cinfo->image_width * 6L, (long) cinfo->block_size);
cinfo->output_height = (JDIMENSION)
jdiv_round_up((long) cinfo->image_height * 6L, (long) cinfo->block_size);
cinfo->min_DCT_h_scaled_size = 6;
cinfo->min_DCT_v_scaled_size = 6;
} else if (cinfo->scale_num * cinfo->block_size <= cinfo->scale_denom * 7) {
/* Provide 7/block_size scaling */
cinfo->output_width = (JDIMENSION)
jdiv_round_up((long) cinfo->image_width * 7L, (long) cinfo->block_size);
cinfo->output_height = (JDIMENSION)
jdiv_round_up((long) cinfo->image_height * 7L, (long) cinfo->block_size);
cinfo->min_DCT_h_scaled_size = 7;
cinfo->min_DCT_v_scaled_size = 7;
} else if (cinfo->scale_num * cinfo->block_size <= cinfo->scale_denom * 8) {
/* Provide 8/block_size scaling */
cinfo->output_width = (JDIMENSION)
jdiv_round_up((long) cinfo->image_width * 8L, (long) cinfo->block_size);
cinfo->output_height = (JDIMENSION)
jdiv_round_up((long) cinfo->image_height * 8L, (long) cinfo->block_size);
cinfo->min_DCT_h_scaled_size = 8;
cinfo->min_DCT_v_scaled_size = 8;
} else if (cinfo->scale_num * cinfo->block_size <= cinfo->scale_denom * 9) {
/* Provide 9/block_size scaling */
cinfo->output_width = (JDIMENSION)
jdiv_round_up((long) cinfo->image_width * 9L, (long) cinfo->block_size);
cinfo->output_height = (JDIMENSION)
jdiv_round_up((long) cinfo->image_height * 9L, (long) cinfo->block_size);
cinfo->min_DCT_h_scaled_size = 9;
cinfo->min_DCT_v_scaled_size = 9;
} else if (cinfo->scale_num * cinfo->block_size <= cinfo->scale_denom * 10) {
/* Provide 10/block_size scaling */
cinfo->output_width = (JDIMENSION)
jdiv_round_up((long) cinfo->image_width * 10L, (long) cinfo->block_size);
cinfo->output_height = (JDIMENSION)
jdiv_round_up((long) cinfo->image_height * 10L, (long) cinfo->block_size);
cinfo->min_DCT_h_scaled_size = 10;
cinfo->min_DCT_v_scaled_size = 10;
} else if (cinfo->scale_num * cinfo->block_size <= cinfo->scale_denom * 11) {
/* Provide 11/block_size scaling */
cinfo->output_width = (JDIMENSION)
jdiv_round_up((long) cinfo->image_width * 11L, (long) cinfo->block_size);
cinfo->output_height = (JDIMENSION)
jdiv_round_up((long) cinfo->image_height * 11L, (long) cinfo->block_size);
cinfo->min_DCT_h_scaled_size = 11;
cinfo->min_DCT_v_scaled_size = 11;
} else if (cinfo->scale_num * cinfo->block_size <= cinfo->scale_denom * 12) {
/* Provide 12/block_size scaling */
cinfo->output_width = (JDIMENSION)
jdiv_round_up((long) cinfo->image_width * 12L, (long) cinfo->block_size);
cinfo->output_height = (JDIMENSION)
jdiv_round_up((long) cinfo->image_height * 12L, (long) cinfo->block_size);
cinfo->min_DCT_h_scaled_size = 12;
cinfo->min_DCT_v_scaled_size = 12;
} else if (cinfo->scale_num * cinfo->block_size <= cinfo->scale_denom * 13) {
/* Provide 13/block_size scaling */
cinfo->output_width = (JDIMENSION)
jdiv_round_up((long) cinfo->image_width * 13L, (long) cinfo->block_size);
cinfo->output_height = (JDIMENSION)
jdiv_round_up((long) cinfo->image_height * 13L, (long) cinfo->block_size);
cinfo->min_DCT_h_scaled_size = 13;
cinfo->min_DCT_v_scaled_size = 13;
} else if (cinfo->scale_num * cinfo->block_size <= cinfo->scale_denom * 14) {
/* Provide 14/block_size scaling */
cinfo->output_width = (JDIMENSION)
jdiv_round_up((long) cinfo->image_width * 14L, (long) cinfo->block_size);
cinfo->output_height = (JDIMENSION)
jdiv_round_up((long) cinfo->image_height * 14L, (long) cinfo->block_size);
cinfo->min_DCT_h_scaled_size = 14;
cinfo->min_DCT_v_scaled_size = 14;
} else if (cinfo->scale_num * cinfo->block_size <= cinfo->scale_denom * 15) {
/* Provide 15/block_size scaling */
cinfo->output_width = (JDIMENSION)
jdiv_round_up((long) cinfo->image_width * 15L, (long) cinfo->block_size);
cinfo->output_height = (JDIMENSION)
jdiv_round_up((long) cinfo->image_height * 15L, (long) cinfo->block_size);
cinfo->min_DCT_h_scaled_size = 15;
cinfo->min_DCT_v_scaled_size = 15;
} else {
/* Provide 16/block_size scaling */
cinfo->output_width = (JDIMENSION)
jdiv_round_up((long) cinfo->image_width * 16L, (long) cinfo->block_size);
cinfo->output_height = (JDIMENSION)
jdiv_round_up((long) cinfo->image_height * 16L, (long) cinfo->block_size);
cinfo->min_DCT_h_scaled_size = 16;
cinfo->min_DCT_v_scaled_size = 16;
}
/* Recompute dimensions of components */
for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
ci++, compptr++) {
compptr->DCT_h_scaled_size = cinfo->min_DCT_h_scaled_size;
compptr->DCT_v_scaled_size = cinfo->min_DCT_v_scaled_size;
}
#else /* !IDCT_SCALING_SUPPORTED */
/* Hardwire it to "no scaling" */
cinfo->output_width = cinfo->image_width;
cinfo->output_height = cinfo->image_height;
/* jdinput.c has already initialized DCT_scaled_size,
* and has computed unscaled downsampled_width and downsampled_height.
*/
#endif /* IDCT_SCALING_SUPPORTED */
}
LOCAL(void)
initial_setup (j_decompress_ptr cinfo)
/* Called once, when first SOS marker is reached */
@ -71,25 +239,121 @@ initial_setup (j_decompress_ptr cinfo)
compptr->v_samp_factor);
}
/* We initialize DCT_scaled_size and min_DCT_scaled_size to DCTSIZE.
* In the full decompressor, this will be overridden by jdmaster.c;
* but in the transcoder, jdmaster.c is not used, so we must do it here.
/* Derive block_size, natural_order, and lim_Se */
if (cinfo->is_baseline || (cinfo->progressive_mode &&
cinfo->comps_in_scan)) { /* no pseudo SOS marker */
cinfo->block_size = DCTSIZE;
cinfo->natural_order = jpeg_natural_order;
cinfo->lim_Se = DCTSIZE2-1;
} else
switch (cinfo->Se) {
case (1*1-1):
cinfo->block_size = 1;
cinfo->natural_order = jpeg_natural_order; /* not needed */
cinfo->lim_Se = cinfo->Se;
break;
case (2*2-1):
cinfo->block_size = 2;
cinfo->natural_order = jpeg_natural_order2;
cinfo->lim_Se = cinfo->Se;
break;
case (3*3-1):
cinfo->block_size = 3;
cinfo->natural_order = jpeg_natural_order3;
cinfo->lim_Se = cinfo->Se;
break;
case (4*4-1):
cinfo->block_size = 4;
cinfo->natural_order = jpeg_natural_order4;
cinfo->lim_Se = cinfo->Se;
break;
case (5*5-1):
cinfo->block_size = 5;
cinfo->natural_order = jpeg_natural_order5;
cinfo->lim_Se = cinfo->Se;
break;
case (6*6-1):
cinfo->block_size = 6;
cinfo->natural_order = jpeg_natural_order6;
cinfo->lim_Se = cinfo->Se;
break;
case (7*7-1):
cinfo->block_size = 7;
cinfo->natural_order = jpeg_natural_order7;
cinfo->lim_Se = cinfo->Se;
break;
case (8*8-1):
cinfo->block_size = 8;
cinfo->natural_order = jpeg_natural_order;
cinfo->lim_Se = DCTSIZE2-1;
break;
case (9*9-1):
cinfo->block_size = 9;
cinfo->natural_order = jpeg_natural_order;
cinfo->lim_Se = DCTSIZE2-1;
break;
case (10*10-1):
cinfo->block_size = 10;
cinfo->natural_order = jpeg_natural_order;
cinfo->lim_Se = DCTSIZE2-1;
break;
case (11*11-1):
cinfo->block_size = 11;
cinfo->natural_order = jpeg_natural_order;
cinfo->lim_Se = DCTSIZE2-1;
break;
case (12*12-1):
cinfo->block_size = 12;
cinfo->natural_order = jpeg_natural_order;
cinfo->lim_Se = DCTSIZE2-1;
break;
case (13*13-1):
cinfo->block_size = 13;
cinfo->natural_order = jpeg_natural_order;
cinfo->lim_Se = DCTSIZE2-1;
break;
case (14*14-1):
cinfo->block_size = 14;
cinfo->natural_order = jpeg_natural_order;
cinfo->lim_Se = DCTSIZE2-1;
break;
case (15*15-1):
cinfo->block_size = 15;
cinfo->natural_order = jpeg_natural_order;
cinfo->lim_Se = DCTSIZE2-1;
break;
case (16*16-1):
cinfo->block_size = 16;
cinfo->natural_order = jpeg_natural_order;
cinfo->lim_Se = DCTSIZE2-1;
break;
default:
ERREXIT4(cinfo, JERR_BAD_PROGRESSION,
cinfo->Ss, cinfo->Se, cinfo->Ah, cinfo->Al);
break;
}
/* We initialize DCT_scaled_size and min_DCT_scaled_size to block_size.
* In the full decompressor,
* this will be overridden by jpeg_calc_output_dimensions in jdmaster.c;
* but in the transcoder,
* jpeg_calc_output_dimensions is not used, so we must do it here.
*/
cinfo->min_DCT_h_scaled_size = DCTSIZE;
cinfo->min_DCT_v_scaled_size = DCTSIZE;
cinfo->min_DCT_h_scaled_size = cinfo->block_size;
cinfo->min_DCT_v_scaled_size = cinfo->block_size;
/* Compute dimensions of components */
for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
ci++, compptr++) {
compptr->DCT_h_scaled_size = DCTSIZE;
compptr->DCT_v_scaled_size = DCTSIZE;
compptr->DCT_h_scaled_size = cinfo->block_size;
compptr->DCT_v_scaled_size = cinfo->block_size;
/* Size in DCT blocks */
compptr->width_in_blocks = (JDIMENSION)
jdiv_round_up((long) cinfo->image_width * (long) compptr->h_samp_factor,
(long) (cinfo->max_h_samp_factor * DCTSIZE));
(long) (cinfo->max_h_samp_factor * cinfo->block_size));
compptr->height_in_blocks = (JDIMENSION)
jdiv_round_up((long) cinfo->image_height * (long) compptr->v_samp_factor,
(long) (cinfo->max_v_samp_factor * DCTSIZE));
(long) (cinfo->max_v_samp_factor * cinfo->block_size));
/* downsampled_width and downsampled_height will also be overridden by
* jdmaster.c if we are doing full decompression. The transcoder library
* doesn't use these values, but the calling application might.
@ -110,7 +374,7 @@ initial_setup (j_decompress_ptr cinfo)
/* Compute number of fully interleaved MCU rows. */
cinfo->total_iMCU_rows = (JDIMENSION)
jdiv_round_up((long) cinfo->image_height,
(long) (cinfo->max_v_samp_factor*DCTSIZE));
(long) (cinfo->max_v_samp_factor * cinfo->block_size));
/* Decide whether file contains multiple scans */
if (cinfo->comps_in_scan < cinfo->num_components || cinfo->progressive_mode)
@ -164,10 +428,10 @@ per_scan_setup (j_decompress_ptr cinfo)
/* Overall image size in MCUs */
cinfo->MCUs_per_row = (JDIMENSION)
jdiv_round_up((long) cinfo->image_width,
(long) (cinfo->max_h_samp_factor*DCTSIZE));
(long) (cinfo->max_h_samp_factor * cinfo->block_size));
cinfo->MCU_rows_in_scan = (JDIMENSION)
jdiv_round_up((long) cinfo->image_height,
(long) (cinfo->max_v_samp_factor*DCTSIZE));
(long) (cinfo->max_v_samp_factor * cinfo->block_size));
cinfo->blocks_in_MCU = 0;
@ -285,6 +549,10 @@ finish_input_pass (j_decompress_ptr cinfo)
* The consume_input method pointer points either here or to the
* coefficient controller's consume_data routine, depending on whether
* we are reading a compressed data segment or inter-segment markers.
*
* Note: This function should NOT return a pseudo SOS marker (with zero
* component number) to the caller. A pseudo marker received by
* read_markers is processed and then skipped for other markers.
*/
METHODDEF(int)
@ -296,13 +564,19 @@ consume_markers (j_decompress_ptr cinfo)
if (inputctl->pub.eoi_reached) /* After hitting EOI, read no further */
return JPEG_REACHED_EOI;
for (;;) { /* Loop to pass pseudo SOS marker */
val = (*cinfo->marker->read_markers) (cinfo);
switch (val) {
case JPEG_REACHED_SOS: /* Found SOS */
if (inputctl->inheaders) { /* 1st SOS */
if (inputctl->inheaders == 1)
initial_setup(cinfo);
inputctl->inheaders = FALSE;
if (cinfo->comps_in_scan == 0) { /* pseudo SOS marker */
inputctl->inheaders = 2;
break;
}
inputctl->inheaders = 0;
/* Note: start_input_pass must be called by jdmaster.c
* before any more input can be consumed. jdapimin.c is
* responsible for enforcing this sequencing.
@ -310,9 +584,11 @@ consume_markers (j_decompress_ptr cinfo)
} else { /* 2nd or later SOS marker */
if (! inputctl->pub.has_multiple_scans)
ERREXIT(cinfo, JERR_EOI_EXPECTED); /* Oops, I wasn't expecting this! */
if (cinfo->comps_in_scan == 0) /* unexpected pseudo SOS marker */
break;
start_input_pass(cinfo);
}
break;
return val;
case JPEG_REACHED_EOI: /* Found EOI */
inputctl->pub.eoi_reached = TRUE;
if (inputctl->inheaders) { /* Tables-only datastream, apparently */
@ -325,12 +601,13 @@ consume_markers (j_decompress_ptr cinfo)
if (cinfo->output_scan_number > cinfo->input_scan_number)
cinfo->output_scan_number = cinfo->input_scan_number;
}
break;
case JPEG_SUSPENDED:
break;
}
return val;
case JPEG_SUSPENDED:
return val;
default:
return val;
}
}
}
@ -346,7 +623,7 @@ reset_input_controller (j_decompress_ptr cinfo)
inputctl->pub.consume_input = consume_markers;
inputctl->pub.has_multiple_scans = FALSE; /* "unknown" would be better */
inputctl->pub.eoi_reached = FALSE;
inputctl->inheaders = TRUE;
inputctl->inheaders = 1;
/* Reset other modules */
(*cinfo->err->reset_error_mgr) ((j_common_ptr) cinfo);
(*cinfo->marker->reset_marker_reader) (cinfo);
@ -380,5 +657,5 @@ jinit_input_controller (j_decompress_ptr cinfo)
*/
inputctl->pub.has_multiple_scans = FALSE; /* "unknown" would be better */
inputctl->pub.eoi_reached = FALSE;
inputctl->inheaders = TRUE;
inputctl->inheaders = 1;
}

72
jdmarker.c
View File

@ -2,6 +2,7 @@
* jdmarker.c
*
* Copyright (C) 1991-1998, Thomas G. Lane.
* Modified 2009 by Guido Vollbeding.
* This file is part of the Independent JPEG Group's software.
* For conditions of distribution and use, see the accompanying README file.
*
@ -234,7 +235,8 @@ get_soi (j_decompress_ptr cinfo)
LOCAL(boolean)
get_sof (j_decompress_ptr cinfo, boolean is_prog, boolean is_arith)
get_sof (j_decompress_ptr cinfo, boolean is_baseline, boolean is_prog,
boolean is_arith)
/* Process a SOFn marker */
{
INT32 length;
@ -242,6 +244,7 @@ get_sof (j_decompress_ptr cinfo, boolean is_prog, boolean is_arith)
jpeg_component_info * compptr;
INPUT_VARS(cinfo);
cinfo->is_baseline = is_baseline;
cinfo->progressive_mode = is_prog;
cinfo->arith_code = is_arith;
@ -315,7 +318,9 @@ get_sos (j_decompress_ptr cinfo)
TRACEMS1(cinfo, 1, JTRC_SOS, n);
if (length != (n * 2 + 6) || n < 1 || n > MAX_COMPS_IN_SCAN)
if (length != (n * 2 + 6) || n > MAX_COMPS_IN_SCAN ||
(n == 0 && !cinfo->progressive_mode))
/* pseudo SOS marker only allowed in progressive mode */
ERREXIT(cinfo, JERR_BAD_LENGTH);
cinfo->comps_in_scan = n;
@ -359,8 +364,8 @@ get_sos (j_decompress_ptr cinfo)
/* Prepare to scan data & restart markers */
cinfo->marker->next_restart_num = 0;
/* Count another SOS marker */
cinfo->input_scan_number++;
/* Count another (non-pseudo) SOS marker */
if (n) cinfo->input_scan_number++;
INPUT_SYNC(cinfo);
return TRUE;
@ -490,16 +495,18 @@ LOCAL(boolean)
get_dqt (j_decompress_ptr cinfo)
/* Process a DQT marker */
{
INT32 length;
int n, i, prec;
INT32 length, count, i;
int n, prec;
unsigned int tmp;
JQUANT_TBL *quant_ptr;
const int *natural_order;
INPUT_VARS(cinfo);
INPUT_2BYTES(cinfo, length, return FALSE);
length -= 2;
while (length > 0) {
length--;
INPUT_BYTE(cinfo, n, return FALSE);
prec = n >> 4;
n &= 0x0F;
@ -513,13 +520,43 @@ get_dqt (j_decompress_ptr cinfo)
cinfo->quant_tbl_ptrs[n] = jpeg_alloc_quant_table((j_common_ptr) cinfo);
quant_ptr = cinfo->quant_tbl_ptrs[n];
if (prec) {
if (length < DCTSIZE2 * 2) {
/* Initialize full table for safety. */
for (i = 0; i < DCTSIZE2; i++) {
quant_ptr->quantval[i] = 1;
}
count = length >> 1;
} else
count = DCTSIZE2;
} else {
if (length < DCTSIZE2) {
/* Initialize full table for safety. */
for (i = 0; i < DCTSIZE2; i++) {
quant_ptr->quantval[i] = 1;
}
count = length;
} else
count = DCTSIZE2;
}
switch (count) {
case (2*2): natural_order = jpeg_natural_order2; break;
case (3*3): natural_order = jpeg_natural_order3; break;
case (4*4): natural_order = jpeg_natural_order4; break;
case (5*5): natural_order = jpeg_natural_order5; break;
case (6*6): natural_order = jpeg_natural_order6; break;
case (7*7): natural_order = jpeg_natural_order7; break;
default: natural_order = jpeg_natural_order; break;
}
for (i = 0; i < count; i++) {
if (prec)
INPUT_2BYTES(cinfo, tmp, return FALSE);
else
INPUT_BYTE(cinfo, tmp, return FALSE);
/* We convert the zigzag-order table to natural array order. */
quant_ptr->quantval[jpeg_natural_order[i]] = (UINT16) tmp;
quant_ptr->quantval[natural_order[i]] = (UINT16) tmp;
}
if (cinfo->err->trace_level >= 2) {
@ -532,8 +569,8 @@ get_dqt (j_decompress_ptr cinfo)
}
}
length -= DCTSIZE2+1;
if (prec) length -= DCTSIZE2;
length -= count;
if (prec) length -= count;
}
if (length != 0)
@ -946,6 +983,11 @@ first_marker (j_decompress_ptr cinfo)
*
* Returns same codes as are defined for jpeg_consume_input:
* JPEG_SUSPENDED, JPEG_REACHED_SOS, or JPEG_REACHED_EOI.
*
* Note: This function may return a pseudo SOS marker (with zero
* component number) for treat by input controller's consume_input.
* consume_input itself should filter out (skip) the pseudo marker
* after processing for the caller.
*/
METHODDEF(int)
@ -975,23 +1017,27 @@ read_markers (j_decompress_ptr cinfo)
break;
case M_SOF0: /* Baseline */
if (! get_sof(cinfo, TRUE, FALSE, FALSE))
return JPEG_SUSPENDED;
break;
case M_SOF1: /* Extended sequential, Huffman */
if (! get_sof(cinfo, FALSE, FALSE))
if (! get_sof(cinfo, FALSE, FALSE, FALSE))
return JPEG_SUSPENDED;
break;
case M_SOF2: /* Progressive, Huffman */
if (! get_sof(cinfo, TRUE, FALSE))
if (! get_sof(cinfo, FALSE, TRUE, FALSE))
return JPEG_SUSPENDED;
break;
case M_SOF9: /* Extended sequential, arithmetic */
if (! get_sof(cinfo, FALSE, TRUE))
if (! get_sof(cinfo, FALSE, FALSE, TRUE))
return JPEG_SUSPENDED;
break;
case M_SOF10: /* Progressive, arithmetic */
if (! get_sof(cinfo, TRUE, TRUE))
if (! get_sof(cinfo, FALSE, TRUE, TRUE))
return JPEG_SUSPENDED;
break;

152
jdmaster.c
View File

@ -2,7 +2,7 @@
* jdmaster.c
*
* Copyright (C) 1991-1997, Thomas G. Lane.
* Modified 2002-2008 by Guido Vollbeding.
* Modified 2002-2009 by Guido Vollbeding.
* This file is part of the Independent JPEG Group's software.
* For conditions of distribution and use, see the accompanying README file.
*
@ -86,7 +86,9 @@ use_merged_upsample (j_decompress_ptr cinfo)
GLOBAL(void)
jpeg_calc_output_dimensions (j_decompress_ptr cinfo)
/* Do computations that are needed before master selection phase */
/* Do computations that are needed before master selection phase.
* This function is used for full decompression.
*/
{
#ifdef IDCT_SCALING_SUPPORTED
int ci;
@ -97,134 +99,11 @@ jpeg_calc_output_dimensions (j_decompress_ptr cinfo)
if (cinfo->global_state != DSTATE_READY)
ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
/* Compute core output image dimensions and DCT scaling choices. */
jpeg_core_output_dimensions(cinfo);
#ifdef IDCT_SCALING_SUPPORTED
/* Compute actual output image dimensions and DCT scaling choices. */
if (cinfo->scale_num * 8 <= cinfo->scale_denom) {
/* Provide 1/8 scaling */
cinfo->output_width = (JDIMENSION)
jdiv_round_up((long) cinfo->image_width, 8L);
cinfo->output_height = (JDIMENSION)
jdiv_round_up((long) cinfo->image_height, 8L);
cinfo->min_DCT_h_scaled_size = 1;
cinfo->min_DCT_v_scaled_size = 1;
} else if (cinfo->scale_num * 4 <= cinfo->scale_denom) {
/* Provide 1/4 scaling */
cinfo->output_width = (JDIMENSION)
jdiv_round_up((long) cinfo->image_width, 4L);
cinfo->output_height = (JDIMENSION)
jdiv_round_up((long) cinfo->image_height, 4L);
cinfo->min_DCT_h_scaled_size = 2;
cinfo->min_DCT_v_scaled_size = 2;
} else if (cinfo->scale_num * 8 <= cinfo->scale_denom * 3) {
/* Provide 3/8 scaling */
cinfo->output_width = (JDIMENSION)
jdiv_round_up((long) cinfo->image_width * 3L, 8L);
cinfo->output_height = (JDIMENSION)
jdiv_round_up((long) cinfo->image_height * 3L, 8L);
cinfo->min_DCT_h_scaled_size = 3;
cinfo->min_DCT_v_scaled_size = 3;
} else if (cinfo->scale_num * 2 <= cinfo->scale_denom) {
/* Provide 1/2 scaling */
cinfo->output_width = (JDIMENSION)
jdiv_round_up((long) cinfo->image_width, 2L);
cinfo->output_height = (JDIMENSION)
jdiv_round_up((long) cinfo->image_height, 2L);
cinfo->min_DCT_h_scaled_size = 4;
cinfo->min_DCT_v_scaled_size = 4;
} else if (cinfo->scale_num * 8 <= cinfo->scale_denom * 5) {
/* Provide 5/8 scaling */
cinfo->output_width = (JDIMENSION)
jdiv_round_up((long) cinfo->image_width * 5L, 8L);
cinfo->output_height = (JDIMENSION)
jdiv_round_up((long) cinfo->image_height * 5L, 8L);
cinfo->min_DCT_h_scaled_size = 5;
cinfo->min_DCT_v_scaled_size = 5;
} else if (cinfo->scale_num * 4 <= cinfo->scale_denom * 3) {
/* Provide 3/4 scaling */
cinfo->output_width = (JDIMENSION)
jdiv_round_up((long) cinfo->image_width * 3L, 4L);
cinfo->output_height = (JDIMENSION)
jdiv_round_up((long) cinfo->image_height * 3L, 4L);
cinfo->min_DCT_h_scaled_size = 6;
cinfo->min_DCT_v_scaled_size = 6;
} else if (cinfo->scale_num * 8 <= cinfo->scale_denom * 7) {
/* Provide 7/8 scaling */
cinfo->output_width = (JDIMENSION)
jdiv_round_up((long) cinfo->image_width * 7L, 8L);
cinfo->output_height = (JDIMENSION)
jdiv_round_up((long) cinfo->image_height * 7L, 8L);
cinfo->min_DCT_h_scaled_size = 7;
cinfo->min_DCT_v_scaled_size = 7;
} else if (cinfo->scale_num <= cinfo->scale_denom) {
/* Provide 1/1 scaling */
cinfo->output_width = cinfo->image_width;
cinfo->output_height = cinfo->image_height;
cinfo->min_DCT_h_scaled_size = DCTSIZE;
cinfo->min_DCT_v_scaled_size = DCTSIZE;
} else if (cinfo->scale_num * 8 <= cinfo->scale_denom * 9) {
/* Provide 9/8 scaling */
cinfo->output_width = cinfo->image_width + (JDIMENSION)
jdiv_round_up((long) cinfo->image_width, 8L);
cinfo->output_height = cinfo->image_height + (JDIMENSION)
jdiv_round_up((long) cinfo->image_height, 8L);
cinfo->min_DCT_h_scaled_size = 9;
cinfo->min_DCT_v_scaled_size = 9;
} else if (cinfo->scale_num * 4 <= cinfo->scale_denom * 5) {
/* Provide 5/4 scaling */
cinfo->output_width = cinfo->image_width + (JDIMENSION)
jdiv_round_up((long) cinfo->image_width, 4L);
cinfo->output_height = cinfo->image_height + (JDIMENSION)
jdiv_round_up((long) cinfo->image_height, 4L);
cinfo->min_DCT_h_scaled_size = 10;
cinfo->min_DCT_v_scaled_size = 10;
} else if (cinfo->scale_num * 8 <= cinfo->scale_denom * 11) {
/* Provide 11/8 scaling */
cinfo->output_width = cinfo->image_width + (JDIMENSION)
jdiv_round_up((long) cinfo->image_width * 3L, 8L);
cinfo->output_height = cinfo->image_height + (JDIMENSION)
jdiv_round_up((long) cinfo->image_height * 3L, 8L);
cinfo->min_DCT_h_scaled_size = 11;
cinfo->min_DCT_v_scaled_size = 11;
} else if (cinfo->scale_num * 2 <= cinfo->scale_denom * 3) {
/* Provide 3/2 scaling */
cinfo->output_width = cinfo->image_width + (JDIMENSION)
jdiv_round_up((long) cinfo->image_width, 2L);
cinfo->output_height = cinfo->image_height + (JDIMENSION)
jdiv_round_up((long) cinfo->image_height, 2L);
cinfo->min_DCT_h_scaled_size = 12;
cinfo->min_DCT_v_scaled_size = 12;
} else if (cinfo->scale_num * 8 <= cinfo->scale_denom * 13) {
/* Provide 13/8 scaling */
cinfo->output_width = cinfo->image_width + (JDIMENSION)
jdiv_round_up((long) cinfo->image_width * 5L, 8L);
cinfo->output_height = cinfo->image_height + (JDIMENSION)
jdiv_round_up((long) cinfo->image_height * 5L, 8L);
cinfo->min_DCT_h_scaled_size = 13;
cinfo->min_DCT_v_scaled_size = 13;
} else if (cinfo->scale_num * 4 <= cinfo->scale_denom * 7) {
/* Provide 7/4 scaling */
cinfo->output_width = cinfo->image_width + (JDIMENSION)
jdiv_round_up((long) cinfo->image_width * 3L, 4L);
cinfo->output_height = cinfo->image_height + (JDIMENSION)
jdiv_round_up((long) cinfo->image_height * 3L, 4L);
cinfo->min_DCT_h_scaled_size = 14;
cinfo->min_DCT_v_scaled_size = 14;
} else if (cinfo->scale_num * 8 <= cinfo->scale_denom * 15) {
/* Provide 15/8 scaling */
cinfo->output_width = cinfo->image_width + (JDIMENSION)
jdiv_round_up((long) cinfo->image_width * 7L, 8L);
cinfo->output_height = cinfo->image_height + (JDIMENSION)
jdiv_round_up((long) cinfo->image_height * 7L, 8L);
cinfo->min_DCT_h_scaled_size = 15;
cinfo->min_DCT_v_scaled_size = 15;
} else {
/* Provide 2/1 scaling */
cinfo->output_width = cinfo->image_width << 1;
cinfo->output_height = cinfo->image_height << 1;
cinfo->min_DCT_h_scaled_size = 16;
cinfo->min_DCT_v_scaled_size = 16;
}
/* In selecting the actual DCT scaling for each component, we try to
* scale up the chroma components via IDCT scaling rather than upsampling.
* This saves time if the upsampler gets to use 1:1 scaling.
@ -263,22 +142,13 @@ jpeg_calc_output_dimensions (j_decompress_ptr cinfo)
compptr->downsampled_width = (JDIMENSION)
jdiv_round_up((long) cinfo->image_width *
(long) (compptr->h_samp_factor * compptr->DCT_h_scaled_size),
(long) (cinfo->max_h_samp_factor * DCTSIZE));
(long) (cinfo->max_h_samp_factor * cinfo->block_size));
compptr->downsampled_height = (JDIMENSION)
jdiv_round_up((long) cinfo->image_height *
(long) (compptr->v_samp_factor * compptr->DCT_v_scaled_size),
(long) (cinfo->max_v_samp_factor * DCTSIZE));
(long) (cinfo->max_v_samp_factor * cinfo->block_size));
}
#else /* !IDCT_SCALING_SUPPORTED */
/* Hardwire it to "no scaling" */
cinfo->output_width = cinfo->image_width;
cinfo->output_height = cinfo->image_height;
/* jdinput.c has already initialized DCT_scaled_size to DCTSIZE,
* and has computed unscaled downsampled_width and downsampled_height.
*/
#endif /* IDCT_SCALING_SUPPORTED */
/* Report number of components in selected colorspace. */
@ -485,9 +355,9 @@ master_selection (j_decompress_ptr cinfo)
/* Inverse DCT */
jinit_inverse_dct(cinfo);
/* Entropy decoding: either Huffman or arithmetic coding. */
if (cinfo->arith_code) {
if (cinfo->arith_code)
jinit_arith_decoder(cinfo);
} else {
else {
jinit_huff_decoder(cinfo);
}

4
jdtrans.c
View File

@ -2,6 +2,7 @@
* jdtrans.c
*
* Copyright (C) 1995-1997, Thomas G. Lane.
* Modified 2000-2009 by Guido Vollbeding.
* This file is part of the Independent JPEG Group's software.
* For conditions of distribution and use, see the accompanying README file.
*
@ -99,6 +100,9 @@ transdecode_master_selection (j_decompress_ptr cinfo)
/* This is effectively a buffered-image operation. */
cinfo->buffered_image = TRUE;
/* Compute output image dimensions and related values. */
jpeg_core_output_dimensions(cinfo);
/* Entropy decoding: either Huffman or arithmetic coding. */
if (cinfo->arith_code)
jinit_arith_decoder(cinfo);

2
jmorecfg.h
View File

@ -160,11 +160,13 @@ typedef short INT16;
#ifndef XMD_H /* X11/xmd.h correctly defines INT32 */
#ifndef _BASETSD_H_ /* Microsoft defines it in basetsd.h */
#ifndef _BASETSD_H /* MinGW is slightly different */
#ifndef QGLOBAL_H /* Qt defines it in qglobal.h */
typedef long INT32;
#endif
#endif
#endif
#endif
/* Datatype used for image dimensions. The JPEG standard only supports
* images up to 64K*64K due to 16-bit fields in SOF markers. Therefore

20
jpegint.h
View File

@ -213,10 +213,6 @@ struct jpeg_entropy_decoder {
JMETHOD(void, start_pass, (j_decompress_ptr cinfo));
JMETHOD(boolean, decode_mcu, (j_decompress_ptr cinfo,
JBLOCKROW *MCU_data));
/* This is here to share code between baseline and progressive decoders; */
/* other modules probably should not use it */
boolean insufficient_data; /* set TRUE after emitting warning */
};
/* Inverse DCT (also performs dequantization) */
@ -330,6 +326,13 @@ struct jpeg_color_quantizer {
#define jzero_far jZeroFar
#define jpeg_zigzag_order jZIGTable
#define jpeg_natural_order jZAGTable
#define jpeg_natural_order7 jZAGTable7
#define jpeg_natural_order6 jZAGTable6
#define jpeg_natural_order5 jZAGTable5
#define jpeg_natural_order4 jZAGTable4
#define jpeg_natural_order3 jZAGTable3
#define jpeg_natural_order2 jZAGTable2
#define jpeg_aritab jAriTab
#endif /* NEED_SHORT_EXTERNAL_NAMES */
@ -384,6 +387,15 @@ EXTERN(void) jzero_far JPP((void FAR * target, size_t bytestozero));
extern const int jpeg_zigzag_order[]; /* natural coef order to zigzag order */
#endif
extern const int jpeg_natural_order[]; /* zigzag coef order to natural order */
extern const int jpeg_natural_order7[]; /* zz to natural order for 7x7 block */
extern const int jpeg_natural_order6[]; /* zz to natural order for 6x6 block */
extern const int jpeg_natural_order5[]; /* zz to natural order for 5x5 block */
extern const int jpeg_natural_order4[]; /* zz to natural order for 4x4 block */
extern const int jpeg_natural_order3[]; /* zz to natural order for 3x3 block */
extern const int jpeg_natural_order2[]; /* zz to natural order for 2x2 block */
/* Arithmetic coding probability estimation tables in jaricom.c */
extern const INT32 jpeg_aritab[];
/* Suppress undefined-structure complaints if necessary. */

29
jpeglib.h
View File

@ -34,10 +34,10 @@ extern "C" {
#endif
/* Version ID for the JPEG library.
* Might be useful for tests like "#if JPEG_LIB_VERSION >= 70".
* Might be useful for tests like "#if JPEG_LIB_VERSION >= 80".
*/
#define JPEG_LIB_VERSION 70 /* Version 7.0 */
#define JPEG_LIB_VERSION 80 /* Version 8.0 */
/* Various constants determining the sizes of things.
@ -171,7 +171,7 @@ typedef struct {
int MCU_width; /* number of blocks per MCU, horizontally */
int MCU_height; /* number of blocks per MCU, vertically */
int MCU_blocks; /* MCU_width * MCU_height */
int MCU_sample_width; /* MCU width in samples, MCU_width*DCT_scaled_size */
int MCU_sample_width; /* MCU width in samples: MCU_width * DCT_h_scaled_size */
int last_col_width; /* # of non-dummy blocks across in last MCU */
int last_row_height; /* # of non-dummy blocks down in last MCU */
@ -414,6 +414,10 @@ struct jpeg_compress_struct {
int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */
int block_size; /* the basic DCT block size: 1..16 */
const int * natural_order; /* natural-order position array */
int lim_Se; /* min( Se, DCTSIZE2-1 ) */
/*
* Links to compression subobjects (methods and private variables of modules)
*/
@ -560,6 +564,7 @@ struct jpeg_decompress_struct {
jpeg_component_info * comp_info;
/* comp_info[i] describes component that appears i'th in SOF */
boolean is_baseline; /* TRUE if Baseline SOF0 encountered */
boolean progressive_mode; /* TRUE if SOFn specifies progressive mode */
boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */
@ -633,6 +638,12 @@ struct jpeg_decompress_struct {
int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */
/* These fields are derived from Se of first SOS marker.
*/
int block_size; /* the basic DCT block size: 1..16 */
const int * natural_order; /* natural-order position array for entropy decode */
int lim_Se; /* min( Se, DCTSIZE2-1 ) for entropy decode */
/* This field is shared between entropy decoder and marker parser.
* It is either zero or the code of a JPEG marker that has been
* read from the data source, but has not yet been processed.
@ -862,6 +873,8 @@ typedef JMETHOD(boolean, jpeg_marker_parser_method, (j_decompress_ptr cinfo));
#define jpeg_destroy_decompress jDestDecompress
#define jpeg_stdio_dest jStdDest
#define jpeg_stdio_src jStdSrc
#define jpeg_mem_dest jMemDest
#define jpeg_mem_src jMemSrc
#define jpeg_set_defaults jSetDefaults
#define jpeg_set_colorspace jSetColorspace
#define jpeg_default_colorspace jDefColorspace
@ -894,6 +907,7 @@ typedef JMETHOD(boolean, jpeg_marker_parser_method, (j_decompress_ptr cinfo));
#define jpeg_input_complete jInComplete
#define jpeg_new_colormap jNewCMap
#define jpeg_consume_input jConsumeInput
#define jpeg_core_output_dimensions jCoreDimensions
#define jpeg_calc_output_dimensions jCalcDimensions
#define jpeg_save_markers jSaveMarkers
#define jpeg_set_marker_processor jSetMarker
@ -938,6 +952,14 @@ EXTERN(void) jpeg_destroy_decompress JPP((j_decompress_ptr cinfo));
EXTERN(void) jpeg_stdio_dest JPP((j_compress_ptr cinfo, FILE * outfile));
EXTERN(void) jpeg_stdio_src JPP((j_decompress_ptr cinfo, FILE * infile));
/* Data source and destination managers: memory buffers. */
EXTERN(void) jpeg_mem_dest JPP((j_compress_ptr cinfo,
unsigned char ** outbuffer,
unsigned long * outsize));
EXTERN(void) jpeg_mem_src JPP((j_decompress_ptr cinfo,
unsigned char * inbuffer,
unsigned long insize));
/* Default parameter setup for compression */
EXTERN(void) jpeg_set_defaults JPP((j_compress_ptr cinfo));
/* Compression parameter setup aids */
@ -1032,6 +1054,7 @@ EXTERN(int) jpeg_consume_input JPP((j_decompress_ptr cinfo));
#define JPEG_SCAN_COMPLETED 4 /* Completed last iMCU row of a scan */
/* Precalculate output dimensions for current decompression parameters. */
EXTERN(void) jpeg_core_output_dimensions JPP((j_decompress_ptr cinfo));
EXTERN(void) jpeg_calc_output_dimensions JPP((j_decompress_ptr cinfo));
/* Control saving of COM and APPn markers into marker_list. */

17
jpegtran.1
View File

@ -1,4 +1,4 @@
.TH JPEGTRAN 1 "28 March 2009"
.TH JPEGTRAN 1 "28 December 2009"
.SH NAME
jpegtran \- lossless transformation of JPEG files
.SH SYNOPSIS
@ -165,7 +165,7 @@ The image can be losslessly cropped by giving the switch:
.B \-crop WxH+X+Y
Crop to a rectangular subarea of width W, height H starting at point X,Y.
.PP
Another not-strictly-lossless transformation switch is:
Other not-strictly-lossless transformation switches are:
.TP
.B \-grayscale
Force grayscale output.
@ -178,6 +178,19 @@ is particularly handy for fixing a monochrome picture that was mistakenly
encoded as a color JPEG. (In such a case, the space savings from getting rid
of the near-empty chroma channels won't be large; but the decoding time for
a grayscale JPEG is substantially less than that for a color JPEG.)
.TP
.BI \-scale " M/N"
Scale the output image by a factor M/N.
.IP
Currently supported scale factors are M/N with all M from 1 to 16, where N is
the source DCT size, which is 8 for baseline JPEG. If the /N part is omitted,
then M specifies the DCT scaled size to be applied on the given input. For
baseline JPEG this is equivalent to M/8 scaling, since the source DCT size
for baseline JPEG is 8.
.B Caution:
An implementation of the JPEG SmartScale extension is required for this
feature. SmartScale enabled JPEG is not yet widely implemented, so many
decoders will be unable to view a SmartScale extended JPEG file at all.
.PP
.B jpegtran
also recognizes these switches that control what to do with "extra" markers,

34
jpegtran.c
View File

@ -1,14 +1,14 @@
/*
* jpegtran.c
*
* Copyright (C) 1995-2001, Thomas G. Lane.
* Copyright (C) 1995-2009, Thomas G. Lane, Guido Vollbeding.
* This file is part of the Independent JPEG Group's software.
* For conditions of distribution and use, see the accompanying README file.
*
* This file contains a command-line user interface for JPEG transcoding.
* It is very similar to cjpeg.c, but provides lossless transcoding between
* different JPEG file formats. It also provides some lossless and sort-of-
* lossless transformations of JPEG data.
* It is very similar to cjpeg.c, and partly to djpeg.c, but provides
* lossless transcoding between different JPEG file formats. It also
* provides some lossless and sort-of-lossless transformations of JPEG data.
*/
#include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */
@ -37,6 +37,7 @@
static const char * progname; /* program name for error messages */
static char * outfilename; /* for -outfile switch */
static char * scaleoption; /* -scale switch */
static JCOPY_OPTION copyoption; /* -copy switch */
static jpeg_transform_info transformoption; /* image transformation options */
@ -69,6 +70,7 @@ usage (void)
fprintf(stderr, " -flip [horizontal|vertical] Mirror image (left-right or top-bottom)\n");
fprintf(stderr, " -perfect Fail if there is non-transformable edge blocks\n");
fprintf(stderr, " -rotate [90|180|270] Rotate image (degrees clockwise)\n");
fprintf(stderr, " -scale M/N Scale output image by fraction M/N, eg, 1/8\n");
fprintf(stderr, " -transpose Transpose image\n");
fprintf(stderr, " -transverse Transverse transpose image\n");
fprintf(stderr, " -trim Drop non-transformable edge blocks\n");
@ -132,10 +134,11 @@ parse_switches (j_compress_ptr cinfo, int argc, char **argv,
/* Set up default JPEG parameters. */
simple_progressive = FALSE;
outfilename = NULL;
scaleoption = NULL;
copyoption = JCOPYOPT_DEFAULT;
transformoption.transform = JXFORM_NONE;
transformoption.trim = FALSE;
transformoption.perfect = FALSE;
transformoption.trim = FALSE;
transformoption.force_grayscale = FALSE;
transformoption.crop = FALSE;
cinfo->err->trace_level = 0;
@ -299,6 +302,13 @@ parse_switches (j_compress_ptr cinfo, int argc, char **argv,
else
usage();
} else if (keymatch(arg, "scale", 4)) {
/* Scale the output image by a fraction M/N. */
if (++argn >= argc) /* advance to next argument */
usage();
scaleoption = argv[argn];
/* We must postpone processing until decompression startup. */
} else if (keymatch(arg, "scans", 1)) {
/* Set scan script. */
#ifdef C_MULTISCAN_FILES_SUPPORTED
@ -453,20 +463,22 @@ main (int argc, char **argv)
/* Read file header */
(void) jpeg_read_header(&srcinfo, TRUE);
/* Adjust default decompression parameters */
if (scaleoption != NULL)
if (sscanf(scaleoption, "%d/%d",
&srcinfo.scale_num, &srcinfo.scale_denom) < 1)
usage();
/* Any space needed by a transform option must be requested before
* jpeg_read_coefficients so that memory allocation will be done right.
*/
#if TRANSFORMS_SUPPORTED
/* Fails right away if -perfect is given and transformation is not perfect.
/* Fail right away if -perfect is given and transformation is not perfect.
*/
if (transformoption.perfect &&
!jtransform_perfect_transform(srcinfo.image_width, srcinfo.image_height,
srcinfo.max_h_samp_factor * DCTSIZE, srcinfo.max_v_samp_factor * DCTSIZE,
transformoption.transform)) {
if (!jtransform_request_workspace(&srcinfo, &transformoption)) {
fprintf(stderr, "%s: transformation is not perfect\n", progname);
exit(EXIT_FAILURE);
}
jtransform_request_workspace(&srcinfo, &transformoption);
#endif
/* Read source file as DCT coefficients */

52
jutils.c
View File

@ -2,6 +2,7 @@
* jutils.c
*
* Copyright (C) 1991-1996, Thomas G. Lane.
* Modified 2009 by Guido Vollbeding.
* This file is part of the Independent JPEG Group's software.
* For conditions of distribution and use, see the accompanying README file.
*
@ -63,6 +64,57 @@ const int jpeg_natural_order[DCTSIZE2+16] = {
63, 63, 63, 63, 63, 63, 63, 63
};
const int jpeg_natural_order7[7*7+16] = {
0, 1, 8, 16, 9, 2, 3, 10,
17, 24, 32, 25, 18, 11, 4, 5,
12, 19, 26, 33, 40, 48, 41, 34,
27, 20, 13, 6, 14, 21, 28, 35,
42, 49, 50, 43, 36, 29, 22, 30,
37, 44, 51, 52, 45, 38, 46, 53,
54,
63, 63, 63, 63, 63, 63, 63, 63, /* extra entries for safety in decoder */
63, 63, 63, 63, 63, 63, 63, 63
};
const int jpeg_natural_order6[6*6+16] = {
0, 1, 8, 16, 9, 2, 3, 10,
17, 24, 32, 25, 18, 11, 4, 5,
12, 19, 26, 33, 40, 41, 34, 27,
20, 13, 21, 28, 35, 42, 43, 36,
29, 37, 44, 45,
63, 63, 63, 63, 63, 63, 63, 63, /* extra entries for safety in decoder */
63, 63, 63, 63, 63, 63, 63, 63
};
const int jpeg_natural_order5[5*5+16] = {
0, 1, 8, 16, 9, 2, 3, 10,
17, 24, 32, 25, 18, 11, 4, 12,
19, 26, 33, 34, 27, 20, 28, 35,
36,
63, 63, 63, 63, 63, 63, 63, 63, /* extra entries for safety in decoder */
63, 63, 63, 63, 63, 63, 63, 63
};
const int jpeg_natural_order4[4*4+16] = {
0, 1, 8, 16, 9, 2, 3, 10,
17, 24, 25, 18, 11, 19, 26, 27,
63, 63, 63, 63, 63, 63, 63, 63, /* extra entries for safety in decoder */
63, 63, 63, 63, 63, 63, 63, 63
};
const int jpeg_natural_order3[3*3+16] = {
0, 1, 8, 16, 9, 2, 10, 17,
18,
63, 63, 63, 63, 63, 63, 63, 63, /* extra entries for safety in decoder */
63, 63, 63, 63, 63, 63, 63, 63
};
const int jpeg_natural_order2[2*2+16] = {
0, 1, 8, 9,
63, 63, 63, 63, 63, 63, 63, 63, /* extra entries for safety in decoder */
63, 63, 63, 63, 63, 63, 63, 63
};
/*
* Arithmetic utilities

6
jversion.h
View File

@ -1,7 +1,7 @@
/*
* jversion.h
*
* Copyright (C) 1991-2009, Thomas G. Lane, Guido Vollbeding.
* Copyright (C) 1991-2010, Thomas G. Lane, Guido Vollbeding.
* This file is part of the Independent JPEG Group's software.
* For conditions of distribution and use, see the accompanying README file.
*
@ -9,6 +9,6 @@
*/
#define JVERSION "7 27-Jun-2009"
#define JVERSION "8 10-Jan-2010"
#define JCOPYRIGHT "Copyright (C) 2009, Thomas G. Lane, Guido Vollbeding"
#define JCOPYRIGHT "Copyright (C) 2010, Thomas G. Lane, Guido Vollbeding"

2
libjpeg.map
View File

@ -1,4 +1,4 @@
LIBJPEG_7.0 {
LIBJPEG_8.0 {
global:
*;
};

49
libjpeg.txt
View File

@ -1123,16 +1123,17 @@ J_COLOR_SPACE out_color_space
unsigned int scale_num, scale_denom
Scale the image by the fraction scale_num/scale_denom. Currently,
the supported scaling ratios are N/8 with all N from 1 to 16. (The
library design allows for arbitrary scaling ratios but this is not
likely to be implemented any time soon.) The values are initialized
by jpeg_read_header() with the source DCT size, which is currently
8/8. If you change only the scale_num value while leaving the other
unchanged, then this specifies the DCT scaled size to be applied on
the given input, which is currently equivalent to N/8 scaling, since
the source DCT size is currently always 8. Smaller scaling ratios
permit significantly faster decoding since fewer pixels need be
processed and a simpler IDCT method can be used.
the supported scaling ratios are M/N with all M from 1 to 16, where
N is the source DCT size, which is 8 for baseline JPEG. (The library
design allows for arbitrary scaling ratios but this is not likely
to be implemented any time soon.) The values are initialized by
jpeg_read_header() with the source DCT size. For baseline JPEG
this is 8/8. If you change only the scale_num value while leaving
the other unchanged, then this specifies the DCT scaled size to be
applied on the given input. For baseline JPEG this is equivalent
to M/8 scaling, since the source DCT size for baseline JPEG is 8.
Smaller scaling ratios permit significantly faster decoding since
fewer pixels need be processed and a simpler IDCT method can be used.
boolean quantize_colors
If set TRUE, colormapped output will be delivered. Default is FALSE,
@ -1432,21 +1433,22 @@ Compressed data handling (source and destination managers)
The JPEG compression library sends its compressed data to a "destination
manager" module. The default destination manager just writes the data to a
stdio stream, but you can provide your own manager to do something else.
Similarly, the decompression library calls a "source manager" to obtain the
compressed data; you can provide your own source manager if you want the data
to come from somewhere other than a stdio stream.
memory buffer or to a stdio stream, but you can provide your own manager to
do something else. Similarly, the decompression library calls a "source
manager" to obtain the compressed data; you can provide your own source
manager if you want the data to come from somewhere other than a memory
buffer or a stdio stream.
In both cases, compressed data is processed a bufferload at a time: the
destination or source manager provides a work buffer, and the library invokes
the manager only when the buffer is filled or emptied. (You could define a
one-character buffer to force the manager to be invoked for each byte, but
that would be rather inefficient.) The buffer's size and location are
controlled by the manager, not by the library. For example, if you desired to
decompress a JPEG datastream that was all in memory, you could just make the
buffer pointer and length point to the original data in memory. Then the
buffer-reload procedure would be invoked only if the decompressor ran off the
end of the datastream, which would indicate an erroneous datastream.
controlled by the manager, not by the library. For example, the memory
source manager just makes the buffer pointer and length point to the original
data in memory. In this case the buffer-reload procedure will be invoked
only if the decompressor ran off the end of the datastream, which would
indicate an erroneous datastream.
The work buffer is defined as an array of datatype JOCTET, which is generally
"char" or "unsigned char". On a machine where char is not exactly 8 bits
@ -1498,7 +1500,8 @@ You will also need code to create a jpeg_destination_mgr struct, fill in its
method pointers, and insert a pointer to the struct into the "dest" field of
the JPEG compression object. This can be done in-line in your setup code if
you like, but it's probably cleaner to provide a separate routine similar to
the jpeg_stdio_dest() routine of the supplied destination manager.
the jpeg_stdio_dest() or jpeg_mem_dest() routines of the supplied destination
managers.
Decompression source managers follow a parallel design, but with some
additional frammishes. The source manager struct contains a pointer and count
@ -1574,10 +1577,10 @@ You will also need code to create a jpeg_source_mgr struct, fill in its method
pointers, and insert a pointer to the struct into the "src" field of the JPEG
decompression object. This can be done in-line in your setup code if you
like, but it's probably cleaner to provide a separate routine similar to the
jpeg_stdio_src() routine of the supplied source manager.
jpeg_stdio_src() or jpeg_mem_src() routines of the supplied source managers.
For more information, consult the stdio source and destination managers
in jdatasrc.c and jdatadst.c.
For more information, consult the memory and stdio source and destination
managers in jdatasrc.c and jdatadst.c.
I/O suspension

16
ltmain.sh
View File

@ -1,6 +1,6 @@
# Generated from ltmain.m4sh.
# ltmain.sh (GNU libtool) 2.2.6
# ltmain.sh (GNU libtool) 2.2.6b
# Written by Gordon Matzigkeit <gord@gnu.ai.mit.edu>, 1996
# Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005, 2006, 2007 2008 Free Software Foundation, Inc.
@ -65,7 +65,7 @@
# compiler: $LTCC
# compiler flags: $LTCFLAGS
# linker: $LD (gnu? $with_gnu_ld)
# $progname: (GNU libtool) 2.2.6
# $progname: (GNU libtool) 2.2.6b
# automake: $automake_version
# autoconf: $autoconf_version
#
@ -73,9 +73,9 @@
PROGRAM=ltmain.sh
PACKAGE=libtool
VERSION=2.2.6
VERSION=2.2.6b
TIMESTAMP=""
package_revision=1.3012
package_revision=1.3017
# Be Bourne compatible
if test -n "${ZSH_VERSION+set}" && (emulate sh) >/dev/null 2>&1; then
@ -116,15 +116,15 @@ $lt_unset CDPATH
: ${CP="cp -f"}
: ${ECHO="echo"}
: ${EGREP="/usr/bin/grep -E"}
: ${FGREP="/usr/bin/grep -F"}
: ${GREP="/usr/bin/grep"}
: ${EGREP="/bin/grep -E"}
: ${FGREP="/bin/grep -F"}
: ${GREP="/bin/grep"}
: ${LN_S="ln -s"}
: ${MAKE="make"}
: ${MKDIR="mkdir"}
: ${MV="mv -f"}
: ${RM="rm -f"}
: ${SED="/opt/local/bin/gsed"}
: ${SED="/bin/sed"}
: ${SHELL="${CONFIG_SHELL-/bin/sh}"}
: ${Xsed="$SED -e 1s/^X//"}

16
rdbmp.c
View File

@ -2,6 +2,7 @@
* rdbmp.c
*
* Copyright (C) 1994-1996, Thomas G. Lane.
* Modified 2009 by Guido Vollbeding.
* This file is part of the Independent JPEG Group's software.
* For conditions of distribution and use, see the accompanying README file.
*
@ -251,8 +252,8 @@ start_input_bmp (j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
(((INT32) UCH(array[offset+3])) << 24))
INT32 bfOffBits;
INT32 headerSize;
INT32 biWidth = 0; /* initialize to avoid compiler warning */
INT32 biHeight = 0;
INT32 biWidth;
INT32 biHeight;
unsigned int biPlanes;
INT32 biCompression;
INT32 biXPelsPerMeter,biYPelsPerMeter;
@ -300,8 +301,6 @@ start_input_bmp (j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
ERREXIT(cinfo, JERR_BMP_BADDEPTH);
break;
}
if (biPlanes != 1)
ERREXIT(cinfo, JERR_BMP_BADPLANES);
break;
case 40:
case 64:
@ -329,8 +328,6 @@ start_input_bmp (j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
ERREXIT(cinfo, JERR_BMP_BADDEPTH);
break;
}
if (biPlanes != 1)
ERREXIT(cinfo, JERR_BMP_BADPLANES);
if (biCompression != 0)
ERREXIT(cinfo, JERR_BMP_COMPRESSED);
@ -343,9 +340,14 @@ start_input_bmp (j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
break;
default:
ERREXIT(cinfo, JERR_BMP_BADHEADER);
break;
return;
}
if (biWidth <= 0 || biHeight <= 0)
ERREXIT(cinfo, JERR_BMP_EMPTY);
if (biPlanes != 1)
ERREXIT(cinfo, JERR_BMP_BADPLANES);
/* Compute distance to bitmap data --- will adjust for colormap below */
bPad = bfOffBits - (headerSize + 14);

164
transupp.c
View File

@ -133,7 +133,8 @@ do_flip_h_no_crop (j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
* mirroring by changing the signs of odd-numbered columns.
* Partial iMCUs at the right edge are left untouched.
*/
MCU_cols = srcinfo->image_width / (dstinfo->max_h_samp_factor * DCTSIZE);
MCU_cols = srcinfo->output_width /
(dstinfo->max_h_samp_factor * dstinfo->min_DCT_h_scaled_size);
for (ci = 0; ci < dstinfo->num_components; ci++) {
compptr = dstinfo->comp_info + ci;
@ -198,7 +199,8 @@ do_flip_h (j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
* different rows of a single virtual array simultaneously. Otherwise,
* this is essentially the same as the routine above.
*/
MCU_cols = srcinfo->image_width / (dstinfo->max_h_samp_factor * DCTSIZE);
MCU_cols = srcinfo->output_width /
(dstinfo->max_h_samp_factor * dstinfo->min_DCT_h_scaled_size);
for (ci = 0; ci < dstinfo->num_components; ci++) {
compptr = dstinfo->comp_info + ci;
@ -262,7 +264,8 @@ do_flip_v (j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
* of odd-numbered rows.
* Partial iMCUs at the bottom edge are copied verbatim.
*/
MCU_rows = srcinfo->image_height / (dstinfo->max_v_samp_factor * DCTSIZE);
MCU_rows = srcinfo->output_height /
(dstinfo->max_v_samp_factor * dstinfo->min_DCT_v_scaled_size);
for (ci = 0; ci < dstinfo->num_components; ci++) {
compptr = dstinfo->comp_info + ci;
@ -389,7 +392,8 @@ do_rot_90 (j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
* at the (output) right edge properly. They just get transposed and
* not mirrored.
*/
MCU_cols = srcinfo->image_height / (dstinfo->max_h_samp_factor * DCTSIZE);
MCU_cols = srcinfo->output_height /
(dstinfo->max_h_samp_factor * dstinfo->min_DCT_h_scaled_size);
for (ci = 0; ci < dstinfo->num_components; ci++) {
compptr = dstinfo->comp_info + ci;
@ -469,7 +473,8 @@ do_rot_270 (j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
* at the (output) bottom edge properly. They just get transposed and
* not mirrored.
*/
MCU_rows = srcinfo->image_width / (dstinfo->max_v_samp_factor * DCTSIZE);
MCU_rows = srcinfo->output_width /
(dstinfo->max_v_samp_factor * dstinfo->min_DCT_v_scaled_size);
for (ci = 0; ci < dstinfo->num_components; ci++) {
compptr = dstinfo->comp_info + ci;
@ -536,8 +541,10 @@ do_rot_180 (j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
JCOEFPTR src_ptr, dst_ptr;
jpeg_component_info *compptr;
MCU_cols = srcinfo->image_width / (dstinfo->max_h_samp_factor * DCTSIZE);
MCU_rows = srcinfo->image_height / (dstinfo->max_v_samp_factor * DCTSIZE);
MCU_cols = srcinfo->output_width /
(dstinfo->max_h_samp_factor * dstinfo->min_DCT_h_scaled_size);
MCU_rows = srcinfo->output_height /
(dstinfo->max_v_samp_factor * dstinfo->min_DCT_v_scaled_size);
for (ci = 0; ci < dstinfo->num_components; ci++) {
compptr = dstinfo->comp_info + ci;
@ -645,8 +652,10 @@ do_transverse (j_decompress_ptr srcinfo, j_compress_ptr dstinfo,
JCOEFPTR src_ptr, dst_ptr;
jpeg_component_info *compptr;
MCU_cols = srcinfo->image_height / (dstinfo->max_h_samp_factor * DCTSIZE);
MCU_rows = srcinfo->image_width / (dstinfo->max_v_samp_factor * DCTSIZE);
MCU_cols = srcinfo->output_height /
(dstinfo->max_h_samp_factor * dstinfo->min_DCT_h_scaled_size);
MCU_rows = srcinfo->output_width /
(dstinfo->max_v_samp_factor * dstinfo->min_DCT_v_scaled_size);
for (ci = 0; ci < dstinfo->num_components; ci++) {
compptr = dstinfo->comp_info + ci;
@ -822,10 +831,10 @@ trim_right_edge (jpeg_transform_info *info, JDIMENSION full_width)
{
JDIMENSION MCU_cols;
MCU_cols = info->output_width / (info->max_h_samp_factor * DCTSIZE);
MCU_cols = info->output_width / info->iMCU_sample_width;
if (MCU_cols > 0 && info->x_crop_offset + MCU_cols ==
full_width / (info->max_h_samp_factor * DCTSIZE))
info->output_width = MCU_cols * (info->max_h_samp_factor * DCTSIZE);
full_width / info->iMCU_sample_width)
info->output_width = MCU_cols * info->iMCU_sample_width;
}
LOCAL(void)
@ -833,10 +842,10 @@ trim_bottom_edge (jpeg_transform_info *info, JDIMENSION full_height)
{
JDIMENSION MCU_rows;
MCU_rows = info->output_height / (info->max_v_samp_factor * DCTSIZE);
MCU_rows = info->output_height / info->iMCU_sample_height;
if (MCU_rows > 0 && info->y_crop_offset + MCU_rows ==
full_height / (info->max_v_samp_factor * DCTSIZE))
info->output_height = MCU_rows * (info->max_v_samp_factor * DCTSIZE);
full_height / info->iMCU_sample_height)
info->output_height = MCU_rows * info->iMCU_sample_height;
}
@ -852,59 +861,89 @@ trim_bottom_edge (jpeg_transform_info *info, JDIMENSION full_height)
* Hence, this routine must be called after jpeg_read_header (which reads
* the image dimensions) and before jpeg_read_coefficients (which realizes
* the source's virtual arrays).
*
* This function returns FALSE right away if -perfect is given
* and transformation is not perfect. Otherwise returns TRUE.
*/
GLOBAL(void)
GLOBAL(boolean)
jtransform_request_workspace (j_decompress_ptr srcinfo,
jpeg_transform_info *info)
{
jvirt_barray_ptr *coef_arrays = NULL;
jvirt_barray_ptr *coef_arrays;
boolean need_workspace, transpose_it;
jpeg_component_info *compptr;
JDIMENSION xoffset, yoffset, width_in_iMCUs, height_in_iMCUs;
JDIMENSION xoffset, yoffset;
JDIMENSION width_in_iMCUs, height_in_iMCUs;
JDIMENSION width_in_blocks, height_in_blocks;
int ci, h_samp_factor, v_samp_factor;
/* Determine number of components in output image */
if (info->force_grayscale &&
srcinfo->jpeg_color_space == JCS_YCbCr &&
srcinfo->num_components == 3) {
srcinfo->num_components == 3)
/* We'll only process the first component */
info->num_components = 1;
} else {
else
/* Process all the components */
info->num_components = srcinfo->num_components;
/* Compute output image dimensions and related values. */
jpeg_core_output_dimensions(srcinfo);
/* Return right away if -perfect is given and transformation is not perfect.
*/
if (info->perfect) {
if (info->num_components == 1) {
if (!jtransform_perfect_transform(srcinfo->output_width,
srcinfo->output_height,
srcinfo->min_DCT_h_scaled_size,
srcinfo->min_DCT_v_scaled_size,
info->transform))
return FALSE;
} else {
if (!jtransform_perfect_transform(srcinfo->output_width,
srcinfo->output_height,
srcinfo->max_h_samp_factor * srcinfo->min_DCT_h_scaled_size,
srcinfo->max_v_samp_factor * srcinfo->min_DCT_v_scaled_size,
info->transform))
return FALSE;
}
}
/* If there is only one output component, force the iMCU size to be 1;
* else use the source iMCU size. (This allows us to do the right thing
* when reducing color to grayscale, and also provides a handy way of
* cleaning up "funny" grayscale images whose sampling factors are not 1x1.)
*/
switch (info->transform) {
case JXFORM_TRANSPOSE:
case JXFORM_TRANSVERSE:
case JXFORM_ROT_90:
case JXFORM_ROT_270:
info->output_width = srcinfo->image_height;
info->output_height = srcinfo->image_width;
info->output_width = srcinfo->output_height;
info->output_height = srcinfo->output_width;
if (info->num_components == 1) {
info->max_h_samp_factor = 1;
info->max_v_samp_factor = 1;
info->iMCU_sample_width = srcinfo->min_DCT_v_scaled_size;
info->iMCU_sample_height = srcinfo->min_DCT_h_scaled_size;
} else {
info->max_h_samp_factor = srcinfo->max_v_samp_factor;
info->max_v_samp_factor = srcinfo->max_h_samp_factor;
info->iMCU_sample_width =
srcinfo->max_v_samp_factor * srcinfo->min_DCT_v_scaled_size;
info->iMCU_sample_height =
srcinfo->max_h_samp_factor * srcinfo->min_DCT_h_scaled_size;
}
break;
default:
info->output_width = srcinfo->image_width;
info->output_height = srcinfo->image_height;
info->output_width = srcinfo->output_width;
info->output_height = srcinfo->output_height;
if (info->num_components == 1) {
info->max_h_samp_factor = 1;
info->max_v_samp_factor = 1;
info->iMCU_sample_width = srcinfo->min_DCT_h_scaled_size;
info->iMCU_sample_height = srcinfo->min_DCT_v_scaled_size;
} else {
info->max_h_samp_factor = srcinfo->max_h_samp_factor;
info->max_v_samp_factor = srcinfo->max_v_samp_factor;
info->iMCU_sample_width =
srcinfo->max_h_samp_factor * srcinfo->min_DCT_h_scaled_size;
info->iMCU_sample_height =
srcinfo->max_v_samp_factor * srcinfo->min_DCT_v_scaled_size;
}
break;
}
@ -942,12 +981,12 @@ jtransform_request_workspace (j_decompress_ptr srcinfo,
yoffset = info->crop_yoffset;
/* Now adjust so that upper left corner falls at an iMCU boundary */
info->output_width =
info->crop_width + (xoffset % (info->max_h_samp_factor * DCTSIZE));
info->crop_width + (xoffset % info->iMCU_sample_width);
info->output_height =
info->crop_height + (yoffset % (info->max_v_samp_factor * DCTSIZE));
info->crop_height + (yoffset % info->iMCU_sample_height);
/* Save x/y offsets measured in iMCUs */
info->x_crop_offset = xoffset / (info->max_h_samp_factor * DCTSIZE);
info->y_crop_offset = yoffset / (info->max_v_samp_factor * DCTSIZE);
info->x_crop_offset = xoffset / info->iMCU_sample_width;
info->y_crop_offset = yoffset / info->iMCU_sample_height;
} else {
info->x_crop_offset = 0;
info->y_crop_offset = 0;
@ -966,14 +1005,14 @@ jtransform_request_workspace (j_decompress_ptr srcinfo,
break;
case JXFORM_FLIP_H:
if (info->trim)
trim_right_edge(info, srcinfo->image_width);
trim_right_edge(info, srcinfo->output_width);
if (info->y_crop_offset != 0)
need_workspace = TRUE;
/* do_flip_h_no_crop doesn't need a workspace array */
break;
case JXFORM_FLIP_V:
if (info->trim)
trim_bottom_edge(info, srcinfo->image_height);
trim_bottom_edge(info, srcinfo->output_height);
/* Need workspace arrays having same dimensions as source image. */
need_workspace = TRUE;
break;
@ -985,8 +1024,8 @@ jtransform_request_workspace (j_decompress_ptr srcinfo,
break;
case JXFORM_TRANSVERSE:
if (info->trim) {
trim_right_edge(info, srcinfo->image_height);
trim_bottom_edge(info, srcinfo->image_width);
trim_right_edge(info, srcinfo->output_height);
trim_bottom_edge(info, srcinfo->output_width);
}
/* Need workspace arrays having transposed dimensions. */
need_workspace = TRUE;
@ -994,22 +1033,22 @@ jtransform_request_workspace (j_decompress_ptr srcinfo,
break;
case JXFORM_ROT_90:
if (info->trim)
trim_right_edge(info, srcinfo->image_height);
trim_right_edge(info, srcinfo->output_height);
/* Need workspace arrays having transposed dimensions. */
need_workspace = TRUE;
transpose_it = TRUE;
break;
case JXFORM_ROT_180:
if (info->trim) {
trim_right_edge(info, srcinfo->image_width);
trim_bottom_edge(info, srcinfo->image_height);
trim_right_edge(info, srcinfo->output_width);
trim_bottom_edge(info, srcinfo->output_height);
}
/* Need workspace arrays having same dimensions as source image. */
need_workspace = TRUE;
break;
case JXFORM_ROT_270:
if (info->trim)
trim_bottom_edge(info, srcinfo->image_width);
trim_bottom_edge(info, srcinfo->output_width);
/* Need workspace arrays having transposed dimensions. */
need_workspace = TRUE;
transpose_it = TRUE;
@ -1026,10 +1065,10 @@ jtransform_request_workspace (j_decompress_ptr srcinfo,
SIZEOF(jvirt_barray_ptr) * info->num_components);
width_in_iMCUs = (JDIMENSION)
jdiv_round_up((long) info->output_width,
(long) (info->max_h_samp_factor * DCTSIZE));
(long) info->iMCU_sample_width);
height_in_iMCUs = (JDIMENSION)
jdiv_round_up((long) info->output_height,
(long) (info->max_v_samp_factor * DCTSIZE));
(long) info->iMCU_sample_height);
for (ci = 0; ci < info->num_components; ci++) {
compptr = srcinfo->comp_info + ci;
if (info->num_components == 1) {
@ -1048,9 +1087,11 @@ jtransform_request_workspace (j_decompress_ptr srcinfo,
((j_common_ptr) srcinfo, JPOOL_IMAGE, FALSE,
width_in_blocks, height_in_blocks, (JDIMENSION) v_samp_factor);
}
}
info->workspace_coef_arrays = coef_arrays;
} else
info->workspace_coef_arrays = NULL;
return TRUE;
}
@ -1062,8 +1103,17 @@ transpose_critical_parameters (j_compress_ptr dstinfo)
int tblno, i, j, ci, itemp;
jpeg_component_info *compptr;
JQUANT_TBL *qtblptr;
JDIMENSION jtemp;
UINT16 qtemp;
/* Transpose image dimensions */
jtemp = dstinfo->image_width;
dstinfo->image_width = dstinfo->image_height;
dstinfo->image_height = jtemp;
itemp = dstinfo->min_DCT_h_scaled_size;
dstinfo->min_DCT_h_scaled_size = dstinfo->min_DCT_v_scaled_size;
dstinfo->min_DCT_v_scaled_size = itemp;
/* Transpose sampling factors */
for (ci = 0; ci < dstinfo->num_components; ci++) {
compptr = dstinfo->comp_info + ci;
@ -1296,10 +1346,10 @@ jtransform_adjust_parameters (j_decompress_ptr srcinfo,
}
/* Correct the destination's image dimensions as necessary
* for crop and rotate/flip operations.
* for rotate/flip, resize, and crop operations.
*/
dstinfo->image_width = info->output_width;
dstinfo->image_height = info->output_height;
dstinfo->jpeg_width = info->output_width;
dstinfo->jpeg_height = info->output_height;
/* Transpose destination image parameters */
switch (info->transform) {
@ -1326,12 +1376,12 @@ jtransform_adjust_parameters (j_decompress_ptr srcinfo,
/* Suppress output of JFIF marker */
dstinfo->write_JFIF_header = FALSE;
/* Adjust Exif image parameters */
if (dstinfo->image_width != srcinfo->image_width ||
dstinfo->image_height != srcinfo->image_height)
if (dstinfo->jpeg_width != srcinfo->image_width ||
dstinfo->jpeg_height != srcinfo->image_height)
/* Align data segment to start of TIFF structure for parsing */
adjust_exif_parameters(srcinfo->marker_list->data + 6,
srcinfo->marker_list->data_length - 6,
dstinfo->image_width, dstinfo->image_height);
dstinfo->jpeg_width, dstinfo->jpeg_height);
}
/* Return the appropriate output data set */
@ -1415,8 +1465,8 @@ jtransform_execute_transform (j_decompress_ptr srcinfo,
* (after reading source header):
* image_width = cinfo.image_width
* image_height = cinfo.image_height
* MCU_width = cinfo.max_h_samp_factor * DCTSIZE
* MCU_height = cinfo.max_v_samp_factor * DCTSIZE
* MCU_width = cinfo.max_h_samp_factor * cinfo.block_size
* MCU_height = cinfo.max_v_samp_factor * cinfo.block_size
* Result:
* TRUE = perfect transformation possible
* FALSE = perfect transformation not possible

19
transupp.h
View File

@ -1,7 +1,7 @@
/*
* transupp.h
*
* Copyright (C) 1997-2001, Thomas G. Lane.
* Copyright (C) 1997-2009, Thomas G. Lane, Guido Vollbeding.
* This file is part of the Independent JPEG Group's software.
* For conditions of distribution and use, see the accompanying README file.
*
@ -58,9 +58,14 @@
* dimensions to keep the lower right crop corner unchanged. (Thus, the
* output image covers at least the requested region, but may cover more.)
*
* If both crop and a rotate/flip transform are requested, the crop is applied
* last --- that is, the crop region is specified in terms of the destination
* image.
* We also provide a lossless-resize option, which is kind of a lossless-crop
* operation in the DCT coefficient block domain - it discards higher-order
* coefficients and losslessly preserves lower-order coefficients of a
* sub-block.
*
* Rotate/flip transform, resize, and crop can be requested together in a
* single invocation. The crop is applied last --- that is, the crop region
* is specified in terms of the destination image after transform/resize.
*
* We also offer a "force to grayscale" option, which simply discards the
* chrominance channels of a YCbCr image. This is lossless in the sense that
@ -143,8 +148,8 @@ typedef struct {
JDIMENSION output_height;
JDIMENSION x_crop_offset; /* destination crop offsets measured in iMCUs */
JDIMENSION y_crop_offset;
int max_h_samp_factor; /* destination iMCU size */
int max_v_samp_factor;
int iMCU_sample_width; /* destination iMCU size */
int iMCU_sample_height;
} jpeg_transform_info;
@ -154,7 +159,7 @@ typedef struct {
EXTERN(boolean) jtransform_parse_crop_spec
JPP((jpeg_transform_info *info, const char *spec));
/* Request any required workspace */
EXTERN(void) jtransform_request_workspace
EXTERN(boolean) jtransform_request_workspace
JPP((j_decompress_ptr srcinfo, jpeg_transform_info *info));
/* Adjust output image parameters */
EXTERN(jvirt_barray_ptr *) jtransform_adjust_parameters

32
usage.txt
View File

@ -137,7 +137,7 @@ behaviour in case that only one parameter is given, which is then used for
both luminance and chrominance (slots 0 and 1). More or custom quantization
tables can be set with -qtables and assigned to components with -qslots
parameter (see the "wizard" switches below).
CAUTION: You must explicitely add -sample 1x1 for efficient separate color
CAUTION: You must explicitly add -sample 1x1 for efficient separate color
quality selection, since the default value used by library is 2x2!
The -progressive switch creates a "progressive JPEG" file. In this type of
@ -245,14 +245,15 @@ The basic command line switches for djpeg are:
djpeg runs noticeably faster in this mode.
-scale M/N Scale the output image by a factor M/N. Currently
supported scale factors are M/8 with all M from 1 to
16. If the /N part is omitted, then M specifies the
DCT scaled size to be applied on the given input,
which is currently equivalent to M/8 scaling, since
the source DCT size is currently always 8.
Scaling is handy if the image is larger than your
screen; also, djpeg runs much faster when scaling
down the output.
supported scale factors are M/N with all M from 1 to
16, where N is the source DCT size, which is 8 for
baseline JPEG. If the /N part is omitted, then M
specifies the DCT scaled size to be applied on the
given input. For baseline JPEG this is equivalent to
M/8 scaling, since the source DCT size for baseline
JPEG is 8. Scaling is handy if the image is larger
than your screen; also, djpeg runs much faster when
scaling down the output.
-bmp Select BMP output format (Windows flavor). 8-bit
colormapped format is emitted if -colors or -grayscale
@ -507,7 +508,8 @@ The image can be losslessly cropped by giving the switch:
-crop WxH+X+Y Crop to a rectangular subarea of width W, height H
starting at point X,Y.
Another not-strictly-lossless transformation switch is:
Other not-strictly-lossless transformation switches are:
-grayscale Force grayscale output.
This option discards the chrominance channels if the input image is YCbCr
(ie, a standard color JPEG), resulting in a grayscale JPEG file. The
@ -518,6 +520,16 @@ encoded as a color JPEG. (In such a case, the space savings from getting rid
of the near-empty chroma channels won't be large; but the decoding time for
a grayscale JPEG is substantially less than that for a color JPEG.)
-scale M/N Scale the output image by a factor M/N.
Currently supported scale factors are M/N with all M from 1 to 16, where N is
the source DCT size, which is 8 for baseline JPEG. If the /N part is omitted,
then M specifies the DCT scaled size to be applied on the given input. For
baseline JPEG this is equivalent to M/8 scaling, since the source DCT size
for baseline JPEG is 8. CAUTION: An implementation of the JPEG SmartScale
extension is required for this feature. SmartScale enabled JPEG is not yet
widely implemented, so many decoders will be unable to view a SmartScale
extended JPEG file at all.
jpegtran also recognizes these switches that control what to do with "extra"
markers, such as comment blocks:
-copy none Copy no extra markers from source file. This setting