NAME

Imager::File::JPEG - read and write JPEG files

SYNOPSIS

  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) { ... }

DESCRIPTION

Imager's JPEG support is documented in Imager::Files.

Besides providing JPEG support, Imager::File::JPEG has the following methods:

libjpeg_version()

  Imager::File::JPEG->libjpeg_version();

Returns version information about the variety of libjpeg Imager::File::JPEG was compiled with. This is determined at build time. This includes:

• The library type, one of libjpeg, libjpeg-turbo or mozjpeg.

• version followed by the library version number.

• api followed by the libjpeg API version.

For libjpeg the API and library versions are always equal.

is_turbojpeg()

  Imager::File::JPEG->is_turbojpeg();

Returns true if Imager::File::JPEG was built with libjpeg-turbo. Note that mozjpeg is built on top of libjpeg-turbo so this will return true for mozjpeg.

is_mozjpeg()

  Imager::File::JPEG->is_mozjpeg();

Returns true if Imager::File::JPEG was built with mozjpeg. Note that mozjpeg doesn't define its own version numbering, so mozjpeg is detected by defines that only mozjpeg currently defines.

has_arith_coding()

Returns true if the libjpeg variant Imager::File::JPEG was built with has both encoding and decoding support for arithmetic coding.

has_encode_arith_coding()

Returns true if the libjpeg variant Imager::File::JPEG was built with has encoding support for arithmetic coding.

has_decode_arith_coding()

Returns true if the libjpeg variant Imager::File::JPEG was built with has decoding support for arithmetic coding.

AUTHOR

Tony Cook <tonyc@cpan.org>

SEE ALSO

Imager, Imager::Files.