.\" -*- mode: troff; coding: utf-8 -*-
.\" Automatically generated by Pod::Man 5.01 (Pod::Simple 3.43)
.\"
.\" Standard preamble:
.\" ========================================================================
.de Sp \" Vertical space (when we can't use .PP)
.if t .sp .5v
.if n .sp
..
.de Vb \" Begin verbatim text
.ft CW
.nf
.ne \\$1
..
.de Ve \" End verbatim text
.ft R
.fi
..
.\" \*(C` and \*(C' are quotes in nroff, nothing in troff, for use with C<>.
.ie n \{\
.    ds C` ""
.    ds C' ""
'br\}
.el\{\
.    ds C`
.    ds C'
'br\}
.\"
.\" Escape single quotes in literal strings from groff's Unicode transform.
.ie \n(.g .ds Aq \(aq
.el       .ds Aq '
.\"
.\" If the F register is >0, we'll generate index entries on stderr for
.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
.\" entries marked with X<> in POD.  Of course, you'll have to process the
.\" output yourself in some meaningful fashion.
.\"
.\" Avoid warning from groff about undefined register 'F'.
.de IX
..
.nr rF 0
.if \n(.g .if rF .nr rF 1
.if (\n(rF:(\n(.g==0)) \{\
.    if \nF \{\
.        de IX
.        tm Index:\\$1\t\\n%\t"\\$2"
..
.        if !\nF==2 \{\
.            nr % 0
.            nr F 2
.        \}
.    \}
.\}
.rr rF
.\" ========================================================================
.\"
.IX Title "JPEG 3pm"
.TH JPEG 3pm 2024-04-13 "perl v5.38.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH NAME
Imager::File::JPEG \- read and write JPEG files
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 1
\&  use Imager;
\&
\&  my $img = Imager\->new;
\&  $img\->read(file=>"foo.jpg")
\&    or die $img\->errstr;
\&
\&  $img\->write(file => "foo.jpg")
\&    or die $img\->errstr;
\&
\&  my $version = Imager::File::JPEG\->libjpeg_version();
\&  if (Imager::File::JPEG\->is_turbojpeg) { ... }
\&  if (Imager::File::JPEG\->is_mozjpeg) { ... }
\&
\&  if (Imager::File::JPEG\->has_arith_coding) { ... }
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
Imager's JPEG support is documented in Imager::Files.
.PP
Besides providing JPEG support, Imager::File::JPEG has the following
methods:
.IP \fBlibjpeg_version()\fR 4
.IX Item "libjpeg_version()"
.Vb 1
\&  Imager::File::JPEG\->libjpeg_version();
.Ve
.Sp
Returns version information about the variety of \f(CW\*(C`libjpeg\*(C'\fR
Imager::File::JPEG was compiled with.  This is determined at build
time.  This includes:
.RS 4
.IP \(bu 4
The library type, one of \f(CW\*(C`libjpeg\*(C'\fR, \f(CW\*(C`libjpeg\-turbo\*(C'\fR or \f(CW\*(C`mozjpeg\*(C'\fR.
.IP \(bu 4
\&\f(CW\*(C`version\*(C'\fR followed by the library version number.
.IP \(bu 4
\&\f(CW\*(C`api\*(C'\fR followed by the \f(CW\*(C`libjpeg\*(C'\fR API version.
.RE
.RS 4
.Sp
For \f(CW\*(C`libjpeg\*(C'\fR the API and library versions are always equal.
.RE
.IP \fBis_turbojpeg()\fR 4
.IX Item "is_turbojpeg()"
.Vb 1
\&  Imager::File::JPEG\->is_turbojpeg();
.Ve
.Sp
Returns true if Imager::File::JPEG was built with \f(CW\*(C`libjpeg\-turbo\*(C'\fR.
Note that \f(CW\*(C`mozjpeg\*(C'\fR is built on top of \f(CW\*(C`libjpeg\-turbo\*(C'\fR so this will
return true for \f(CW\*(C`mozjpeg\*(C'\fR.
.IP \fBis_mozjpeg()\fR 4
.IX Item "is_mozjpeg()"
.Vb 1
\&  Imager::File::JPEG\->is_mozjpeg();
.Ve
.Sp
Returns true if Imager::File::JPEG was built with \f(CW\*(C`mozjpeg\*(C'\fR.  Note
that \f(CW\*(C`mozjpeg\*(C'\fR doesn't define its own version numbering, so
\&\f(CW\*(C`mozjpeg\*(C'\fR is detected by defines that only \f(CW\*(C`mozjpeg\*(C'\fR currently
defines.
.IP \fBhas_arith_coding()\fR 4
.IX Item "has_arith_coding()"
Returns true if the \f(CW\*(C`libjpeg\*(C'\fR variant \f(CW\*(C`Imager::File::JPEG\*(C'\fR was built
with has both encoding and decoding support for arithmetic coding.
.IP \fBhas_encode_arith_coding()\fR 4
.IX Item "has_encode_arith_coding()"
Returns true if the \f(CW\*(C`libjpeg\*(C'\fR variant \f(CW\*(C`Imager::File::JPEG\*(C'\fR was built
with has encoding support for arithmetic coding.
.IP \fBhas_decode_arith_coding()\fR 4
.IX Item "has_decode_arith_coding()"
Returns true if the \f(CW\*(C`libjpeg\*(C'\fR variant \f(CW\*(C`Imager::File::JPEG\*(C'\fR was built
with has decoding support for arithmetic coding.
.SH AUTHOR
.IX Header "AUTHOR"
Tony Cook <tonyc@cpan.org>
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Imager, Imager::Files.