Introduction to libjpeg-turbo
libjpeg-turbo is a fork of the
original IJG libjpeg which uses
SIMD to accelerate baseline JPEG compression and decompression.
libjpeg is a library that
implements JPEG image encoding, decoding and transcoding.
Note
Development versions of BLFS may not build or run some packages
properly if LFS or dependencies have been updated since the most
recent stable versions of the books.
Package Information
libjpeg-turbo Dependencies
Required
CMake-3.30.4
Recommended
NASM-2.16.03 or yasm-1.3.0 (for building the package with
optimized assembly routine)
Installation of libjpeg-turbo
Install libjpeg-turbo by running
the following commands:
mkdir build &&
cd build &&
cmake -D CMAKE_INSTALL_PREFIX=/usr \
-D CMAKE_BUILD_TYPE=RELEASE \
-D ENABLE_STATIC=FALSE \
-D CMAKE_INSTALL_DEFAULT_LIBDIR=lib \
-D CMAKE_SKIP_INSTALL_RPATH=ON \
-D CMAKE_INSTALL_DOCDIR=/usr/share/doc/libjpeg-turbo-3.0.1 \
.. &&
make
To test the results, issue: make
test.
Now, as the root
user:
make install
Command Explanations
-D
CMAKE_SKIP_INSTALL_RPATH=ON
: This switch makes
cmake remove
hardcoded library search paths (rpath) when installing a binary
executable file or a shared library. This package does not need
rpath once it's installed into the standard location, and rpath may
sometimes cause unwanted effects or even security issues.
-D WITH_JPEG8=ON
: This switch enables
compatibility with libjpeg version
8.
Contents
Installed Programs:
cjpeg, djpeg, jpegtran, rdjpgcom,
tjbench, and wrjpgcom
Installed Libraries:
libjpeg.so and libturbojpeg.so
Installed Directories:
/usr/share/doc/libjpeg-turbo-3.0.1
Short Descriptions
cjpeg
|
compresses image files to produce a JPEG/JFIF file on the
standard output. Currently supported input file formats
are: PPM (PBMPLUS color format), PGM (PBMPLUS gray-scale
format), BMP, and Targa
|
djpeg
|
decompresses image files from JPEG/JFIF format to either
PPM (PBMPLUS color format), PGM (PBMPLUS gray-scale
format), BMP, or Targa format
|
jpegtran
|
is used for lossless transformation of JPEG files
|
rdjpgcom
|
displays text comments from within a JPEG file
|
tjbench
|
is used to benchmark the performance of libjpeg-turbo
|
wrjpgcom
|
inserts text comments into a JPEG file
|
libjpeg.so
|
contains functions used for reading and writing JPEG
images
|