kc3-lang/libjpeg-turbo/BUILDING.md

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Building libjpeg-turbo

Build Requirements

All Systems

Un*x Platforms (including Linux, Mac, FreeBSD, Solaris, and Cygwin)

Windows

Out-of-Tree Builds

Binary objects, libraries, and executables are generated in the directory from which CMake is executed (the “binary directory”), and this directory need not necessarily be the same as the libjpeg-turbo source directory. You can create multiple independent binary directories, in which different versions of libjpeg-turbo can be built from the same source tree using different compilers or settings. In the sections below, {build_directory} refers to the binary directory, whereas {source_directory} refers to the libjpeg-turbo source directory. For in-tree builds, these directories are the same.

Build Procedure

NOTE: The build procedures below assume that CMake is invoked from the command line, but all of these procedures can be adapted to the CMake GUI as well.

Un*x

The following procedure will build libjpeg-turbo on Unix and Unix-like systems. (On Solaris, this generates a 32-bit build. See “Build Recipes” below for 64-bit build instructions.)

cd {build_directory}
cmake -G"Unix Makefiles" [additional CMake flags] {source_directory}
make

This will generate the following files under {build_directory}:

libjpeg.a<br> Static link library for the libjpeg API

libjpeg.so.{version} (Linux, Unix)<br> libjpeg.{version}.dylib (Mac)<br> cygjpeg-{version}.dll (Cygwin)<br> Shared library for the libjpeg API

By default, {version} is 62.2.0, 7.2.0, or 8.1.2, depending on whether libjpeg v6b (default), v7, or v8 emulation is enabled. If using Cygwin, {version} is 62, 7, or 8.

libjpeg.so (Linux, Unix)<br> libjpeg.dylib (Mac)<br> Development symlink for the libjpeg API

libjpeg.dll.a (Cygwin)<br> Import library for the libjpeg API

libturbojpeg.a<br> Static link library for the TurboJPEG API

libturbojpeg.so.0.2.0 (Linux, Unix)<br> libturbojpeg.0.2.0.dylib (Mac)<br> cygturbojpeg-0.dll (Cygwin)<br> Shared library for the TurboJPEG API

libturbojpeg.so (Linux, Unix)<br> libturbojpeg.dylib (Mac)<br> Development symlink for the TurboJPEG API

libturbojpeg.dll.a (Cygwin)<br> Import library for the TurboJPEG API

Visual C++ (Command Line)

cd {build_directory}
cmake -G"NMake Makefiles" -DCMAKE_BUILD_TYPE=Release [additional CMake flags] {source_directory}
nmake

This will build either a 32-bit or a 64-bit version of libjpeg-turbo, depending on which version of cl.exe is in the PATH.

The following files will be generated under {build_directory}:

jpeg-static.lib<br> Static link library for the libjpeg API

jpeg{version}.dll<br> DLL for the libjpeg API

jpeg.lib<br> Import library for the libjpeg API

turbojpeg-static.lib<br> Static link library for the TurboJPEG API

turbojpeg.dll<br> DLL for the TurboJPEG API

turbojpeg.lib<br> Import library for the TurboJPEG API

{version} is 62, 7, or 8, depending on whether libjpeg v6b (default), v7, or v8 emulation is enabled.

Visual C++ (IDE)

Choose the appropriate CMake generator option for your version of Visual Studio (run cmake with no arguments for a list of available generators.) For instance:

cd {build_directory}
cmake -G"Visual Studio 10" [additional CMake flags] {source_directory}

NOTE: Add “Win64” to the generator name (for example, “Visual Studio 10 Win64”) to build a 64-bit version of libjpeg-turbo. A separate build directory must be used for 32-bit and 64-bit builds.

You can then open ALL_BUILD.vcproj in Visual Studio and build one of the configurations in that project (“Debug”, “Release”, etc.) to generate a full build of libjpeg-turbo.

This will generate the following files under {build_directory}:

{configuration}/jpeg-static.lib<br> Static link library for the libjpeg API

{configuration}/jpeg{version}.dll<br> DLL for the libjpeg API

{configuration}/jpeg.lib<br> Import library for the libjpeg API

{configuration}/turbojpeg-static.lib<br> Static link library for the TurboJPEG API

{configuration}/turbojpeg.dll<br> DLL for the TurboJPEG API

{configuration}/turbojpeg.lib<br> Import library for the TurboJPEG API

{configuration} is Debug, Release, RelWithDebInfo, or MinSizeRel, depending on the configuration you built in the IDE, and {version} is 62, 7, or 8, depending on whether libjpeg v6b (default), v7, or v8 emulation is enabled.

MinGW

NOTE: This assumes that you are building on a Windows machine using the MSYS environment. If you are cross-compiling on a Un*x platform (including Mac and Cygwin), then see “Build Recipes” below.

cd {build_directory}
cmake -G"MSYS Makefiles" [additional CMake flags] {source_directory}
make

This will generate the following files under {build_directory}:

libjpeg.a<br> Static link library for the libjpeg API

libjpeg-{version}.dll<br> DLL for the libjpeg API

libjpeg.dll.a<br> Import library for the libjpeg API

libturbojpeg.a<br> Static link library for the TurboJPEG API

libturbojpeg.dll<br> DLL for the TurboJPEG API

libturbojpeg.dll.a<br> Import library for the TurboJPEG API

{version} is 62, 7, or 8, depending on whether libjpeg v6b (default), v7, or v8 emulation is enabled.

Debug Build

Add -DCMAKE_BUILD_TYPE=Debug to the CMake command line. Or, if building with NMake, remove -DCMAKE_BUILD_TYPE=Release (Debug builds are the default with NMake.)

libjpeg v7 or v8 API/ABI Emulation

Add -DWITH_JPEG7=1 to the CMake command line to build a version of libjpeg-turbo that is API/ABI-compatible with libjpeg v7. Add -DWITH_JPEG8=1 to the CMake command line to build a version of libjpeg-turbo that is API/ABI-compatible with libjpeg v8. See README.md for more information about libjpeg v7 and v8 emulation.

In-Memory Source/Destination Managers

When using libjpeg v6b or v7 API/ABI emulation, add -DWITH_MEM_SRCDST=0 to the CMake command line to build a version of libjpeg-turbo that lacks the jpeg_mem_src() and jpeg_mem_dest() functions. These functions were not part of the original libjpeg v6b and v7 APIs, so removing them ensures strict conformance with those APIs. See README.md for more information.

Arithmetic Coding Support

Since the patent on arithmetic coding has expired, this functionality has been included in this release of libjpeg-turbo. libjpeg-turbo’s implementation is based on the implementation in libjpeg v8, but it works when emulating libjpeg v7 or v6b as well. The default is to enable both arithmetic encoding and decoding, but those who have philosophical objections to arithmetic coding can add -DWITH_ARITH_ENC=0 or -DWITH_ARITH_DEC=0 to the CMake command line to disable encoding or decoding (respectively.)

TurboJPEG Java Wrapper

Add -DWITH_JAVA=1 to the CMake command line to incorporate an optional Java Native Interface (JNI) wrapper into the TurboJPEG shared library and build the Java front-end classes to support it. This allows the TurboJPEG shared library to be used directly from Java applications. See java/README for more details.

If Java is not in your PATH, or if you wish to use an alternate JDK to build/test libjpeg-turbo, then (prior to running CMake) set the JAVA_HOME environment variable to the location of the JDK that you wish to use. The Java_JAVAC_EXECUTABLE, Java_JAVA_EXECUTABLE, and Java_JAR_EXECUTABLE CMake variables can also be used to specify alternate commands or locations for javac, jar, and java (respectively.) You can also set the CMAKE_JAVA_COMPILE_FLAGS CMake variable or the JAVAFLAGS environment variable to specify arguments that should be passed to the Java compiler when building the TurboJPEG classes, and the JAVAARGS CMake variable to specify arguments that should be passed to the JRE when running the TurboJPEG Java unit tests.

Build Recipes

32-bit Build on 64-bit Linux/Unix/Mac

Use export/setenv to set the following environment variables before running CMake:

CFLAGS=-m32
LDFLAGS=-m32

64-bit Build on Solaris

Use export/setenv to set the following environment variables before running CMake:

CFLAGS=-m64
LDFLAGS=-m64

Other Compilers

On Un*x systems, prior to running CMake, you can set the CC environment variable to the command used to invoke the C compiler.

32-bit MinGW Build on Un*x (including Mac and Cygwin)

Create a file called toolchain.cmake under {build_directory}, with the following contents:

set(CMAKE_SYSTEM_NAME Windows)
set(CMAKE_SYSTEM_PROCESSOR X86)
set(CMAKE_C_COMPILER {mingw_binary_path}/i686-w64-mingw32-gcc)
set(CMAKE_RC_COMPILER {mingw_binary_path}/i686-w64-mingw32-windres)

{mingw_binary_path} is the directory under which the MinGW binaries are located (usually /usr/bin.) Next, execute the following commands:

cd {build_directory}
cmake -G"Unix Makefiles" -DCMAKE_TOOLCHAIN_FILE=toolchain.cmake \
  [additional CMake flags] {source_directory}
make

64-bit MinGW Build on Un*x (including Mac and Cygwin)

Create a file called toolchain.cmake under {build_directory}, with the following contents:

set(CMAKE_SYSTEM_NAME Windows)
set(CMAKE_SYSTEM_PROCESSOR AMD64)
set(CMAKE_C_COMPILER {mingw_binary_path}/x86_64-w64-mingw32-gcc)
set(CMAKE_RC_COMPILER {mingw_binary_path}/x86_64-w64-mingw32-windres)

{mingw_binary_path} is the directory under which the MinGW binaries are located (usually /usr/bin.) Next, execute the following commands:

cd {build_directory}
cmake -G"Unix Makefiles" -DCMAKE_TOOLCHAIN_FILE=toolchain.cmake \
  [additional CMake flags] {source_directory}
make

Building libjpeg-turbo for iOS

iOS platforms, such as the iPhone and iPad, use ARM processors, and all currently supported models include NEON instructions. Thus, they can take advantage of libjpeg-turbo’s SIMD extensions to significantly accelerate JPEG compression/decompression. This section describes how to build libjpeg-turbo for these platforms.

Additional build requirements

ARMv7 (32-bit)

gas-preprocessor.pl required

The following scripts demonstrate how to build libjpeg-turbo to run on the iPhone 3GS-4S/iPad 1st-3rd Generation and newer:

Xcode 4.2 and earlier (LLVM-GCC)

IOS_PLATFORMDIR=/Developer/Platforms/iPhoneOS.platform
IOS_SYSROOT=($IOS_PLATFORMDIR/Developer/SDKs/iPhoneOS*.sdk)
export CFLAGS="-mfloat-abi=softfp -march=armv7 -mcpu=cortex-a8 -mtune=cortex-a8 -mfpu=neon -miphoneos-version-min=3.0"

cd {build_directory}

cat <<EOF >toolchain.cmake
set(CMAKE_SYSTEM_NAME Darwin)
set(CMAKE_SYSTEM_PROCESSOR arm)
set(CMAKE_C_COMPILER ${IOS_PLATFORMDIR}/Developer/usr/bin/arm-apple-darwin10-llvm-gcc-4.2)
EOF

cmake -G"Unix Makefiles" -DCMAKE_TOOLCHAIN_FILE=toolchain.cmake \
  -DCMAKE_OSX_SYSROOT=${IOS_SYSROOT[0]} \
  [additional CMake flags] {source_directory}
make

Xcode 4.3-4.6 (LLVM-GCC)

Same as above, but replace the first line with:

IOS_PLATFORMDIR=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform

Xcode 5 and later (Clang)

IOS_PLATFORMDIR=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform
IOS_SYSROOT=($IOS_PLATFORMDIR/Developer/SDKs/iPhoneOS*.sdk)
export CFLAGS="-mfloat-abi=softfp -arch armv7 -miphoneos-version-min=3.0"
export ASMFLAGS="-no-integrated-as"

cd {build_directory}

cat <<EOF >toolchain.cmake
set(CMAKE_SYSTEM_NAME Darwin)
set(CMAKE_SYSTEM_PROCESSOR arm)
set(CMAKE_C_COMPILER /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang)
EOF

cmake -G"Unix Makefiles" -DCMAKE_TOOLCHAIN_FILE=toolchain.cmake \
  -DCMAKE_OSX_SYSROOT=${IOS_SYSROOT[0]} \
  [additional CMake flags] {source_directory}
make

ARMv7s (32-bit)

gas-preprocessor.pl required

The following scripts demonstrate how to build libjpeg-turbo to run on the iPhone 5/iPad 4th Generation and newer:

Xcode 4.5-4.6 (LLVM-GCC)

IOS_PLATFORMDIR=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform
IOS_SYSROOT=($IOS_PLATFORMDIR/Developer/SDKs/iPhoneOS*.sdk)
export CFLAGS="-Wall -mfloat-abi=softfp -march=armv7s -mcpu=swift -mtune=swift -mfpu=neon -miphoneos-version-min=6.0"

cd {build_directory}

cat <<EOF >toolchain.cmake
set(CMAKE_SYSTEM_NAME Darwin)
set(CMAKE_SYSTEM_PROCESSOR arm)
set(CMAKE_C_COMPILER ${IOS_PLATFORMDIR}/Developer/usr/bin/arm-apple-darwin10-llvm-gcc-4.2)
EOF

cmake -G"Unix Makefiles" -DCMAKE_TOOLCHAIN_FILE=toolchain.cmake \
  -DCMAKE_OSX_SYSROOT=${IOS_SYSROOT[0]} \
  [additional CMake flags] {source_directory}
make

Xcode 5 and later (Clang)

Same as the ARMv7 build procedure for Xcode 5 and later, except replace the compiler flags as follows:

export CFLAGS="-Wall -mfloat-abi=softfp -arch armv7s -miphoneos-version-min=6.0"

ARMv8 (64-bit)

gas-preprocessor.pl required if using Xcode < 6

The following script demonstrates how to build libjpeg-turbo to run on the iPhone 5S/iPad Mini 2/iPad Air and newer.

IOS_PLATFORMDIR=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform
IOS_SYSROOT=($IOS_PLATFORMDIR/Developer/SDKs/iPhoneOS*.sdk)
export CFLAGS="-Wall -arch arm64 -miphoneos-version-min=7.0 -funwind-tables"

cd {build_directory}

cat <<EOF >toolchain.cmake
set(CMAKE_SYSTEM_NAME Darwin)
set(CMAKE_SYSTEM_PROCESSOR aarch64)
set(CMAKE_C_COMPILER /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang)
EOF

cmake -G"Unix Makefiles" -DCMAKE_TOOLCHAIN_FILE=toolchain.cmake \
  -DCMAKE_OSX_SYSROOT=${IOS_SYSROOT[0]} \
  [additional CMake flags] {source_directory}
make

Once built, lipo can be used to combine the ARMv7, v7s, and/or v8 variants into a universal library.

Building libjpeg-turbo for Android

Building libjpeg-turbo for Android platforms requires v13b or later of the Android NDK.

ARMv7 (32-bit)

The following is a general recipe script that can be modified for your specific needs.

# Set these variables to suit your needs
NDK_PATH={full path to the NDK directory-- for example,
  /opt/android/android-ndk-r16b}
TOOLCHAIN={"gcc" or "clang"-- "gcc" must be used with NDK r16b and earlier,
  and "clang" must be used with NDK r17c and later}
ANDROID_VERSION={the minimum version of Android to support-- for example,
  "16", "19", etc.}

cd {build_directory}
cmake -G"Unix Makefiles" \
  -DANDROID_ABI=armeabi-v7a \
  -DANDROID_ARM_MODE=arm \
  -DANDROID_PLATFORM=android-${ANDROID_VERSION} \
  -DANDROID_TOOLCHAIN=${TOOLCHAIN} \
  -DCMAKE_ASM_FLAGS="--target=arm-linux-androideabi${ANDROID_VERSION}" \
  -DCMAKE_TOOLCHAIN_FILE=${NDK_PATH}/build/cmake/android.toolchain.cmake \
  [additional CMake flags] {source_directory}
make

ARMv8 (64-bit)

The following is a general recipe script that can be modified for your specific needs.

# Set these variables to suit your needs
NDK_PATH={full path to the NDK directory-- for example,
  /opt/android/android-ndk-r16b}
TOOLCHAIN={"gcc" or "clang"-- "gcc" must be used with NDK r14b and earlier,
  and "clang" must be used with NDK r17c and later}
ANDROID_VERSION={the minimum version of Android to support.  "21" or later
  is required for a 64-bit build.}

cd {build_directory}
cmake -G"Unix Makefiles" \
  -DANDROID_ABI=arm64-v8a \
  -DANDROID_ARM_MODE=arm \
  -DANDROID_PLATFORM=android-${ANDROID_VERSION} \
  -DANDROID_TOOLCHAIN=${TOOLCHAIN} \
  -DCMAKE_ASM_FLAGS="--target=aarch64-linux-android${ANDROID_VERSION}" \
  -DCMAKE_TOOLCHAIN_FILE=${NDK_PATH}/build/cmake/android.toolchain.cmake \
  [additional CMake flags] {source_directory}
make

x86 (32-bit)

The following is a general recipe script that can be modified for your specific needs.

# Set these variables to suit your needs
NDK_PATH={full path to the NDK directory-- for example,
  /opt/android/android-ndk-r16b}
TOOLCHAIN={"gcc" or "clang"-- "gcc" must be used with NDK r14b and earlier,
  and "clang" must be used with NDK r17c and later}
ANDROID_VERSION={The minimum version of Android to support-- for example,
  "16", "19", etc.}

cd {build_directory}
cmake -G"Unix Makefiles" \
  -DANDROID_ABI=x86 \
  -DANDROID_PLATFORM=android-${ANDROID_VERSION} \
  -DANDROID_TOOLCHAIN=${TOOLCHAIN} \
  -DCMAKE_TOOLCHAIN_FILE=${NDK_PATH}/build/cmake/android.toolchain.cmake \
  [additional CMake flags] {source_directory}
make

x86-64 (64-bit)

The following is a general recipe script that can be modified for your specific needs.

# Set these variables to suit your needs
NDK_PATH={full path to the NDK directory-- for example,
  /opt/android/android-ndk-r16b}
TOOLCHAIN={"gcc" or "clang"-- "gcc" must be used with NDK r14b and earlier,
  and "clang" must be used with NDK r17c and later}
ANDROID_VERSION={the minimum version of Android to support.  "21" or later
  is required for a 64-bit build.}

cd {build_directory}
cmake -G"Unix Makefiles" \
  -DANDROID_ABI=x86_64 \
  -DANDROID_PLATFORM=android-${ANDROID_VERSION} \
  -DANDROID_TOOLCHAIN=${TOOLCHAIN} \
  -DCMAKE_TOOLCHAIN_FILE=${NDK_PATH}/build/cmake/android.toolchain.cmake \
  [additional CMake flags] {source_directory}
make

Advanced CMake Options

To list and configure other CMake options not specifically mentioned in this guide, run

ccmake {source_directory}

or

cmake-gui {source_directory}

from the build directory after initially configuring the build. CCMake is a text-based interactive version of CMake, and CMake-GUI is a GUI version. Both will display all variables that are relevant to the libjpeg-turbo build, their current values, and a help string describing what they do.

Installing libjpeg-turbo

You can use the build system to install libjpeg-turbo (as opposed to creating an installer package.) To do this, run make install or nmake install (or build the “install” target in the Visual Studio IDE.) Running make uninstall or nmake uninstall (or building the “uninstall” target in the Visual Studio IDE) will uninstall libjpeg-turbo.

The CMAKE_INSTALL_PREFIX CMake variable can be modified in order to install libjpeg-turbo into a directory of your choosing. If you don’t specify CMAKE_INSTALL_PREFIX, then the default is:

c:\libjpeg-turbo<br> Visual Studio 32-bit build

c:\libjpeg-turbo64<br> Visual Studio 64-bit build

c:\libjpeg-turbo-gcc<br> MinGW 32-bit build

c:\libjpeg-turbo-gcc64<br> MinGW 64-bit build

/opt/libjpeg-turbo<br> Un*x

The default value of CMAKE_INSTALL_PREFIX causes the libjpeg-turbo files to be installed with a directory structure resembling that of the official libjpeg-turbo binary packages. Changing the value of CMAKE_INSTALL_PREFIX (for instance, to /usr/local) causes the libjpeg-turbo files to be installed with a directory structure that conforms to GNU standards.

The CMAKE_INSTALL_BINDIR, CMAKE_INSTALL_DATAROOTDIR, CMAKE_INSTALL_DOCDIR, CMAKE_INSTALL_INCLUDEDIR, CMAKE_INSTALL_JAVADIR, CMAKE_INSTALL_LIBDIR, and CMAKE_INSTALL_MANDIR CMake variables allow a finer degree of control over where specific files in the libjpeg-turbo distribution should be installed. These directory variables can either be specified as absolute paths or as paths relative to CMAKE_INSTALL_PREFIX (for instance, setting CMAKE_INSTALL_DOCDIR to doc would cause the documentation to be installed in ${CMAKE_INSTALL_PREFIX}/doc.) If a directory variable contains the name of another directory variable in angle brackets, then its final value will depend on the final value of that other variable. For instance, the default value of CMAKE_INSTALL_MANDIR is \<CMAKE_INSTALL_DATAROOTDIR>/man.

NOTE: If setting one of these directory variables to a relative path using the CMake command line, you must specify that the variable is of type PATH. For example:

cmake -G"{generator type}" -DCMAKE_INSTALL_LIBDIR:PATH=lib {source_directory}

Otherwise, CMake will assume that the path is relative to the build directory rather than the install directory.

Creating Distribution Packages

The following commands can be used to create various types of distribution packages:

Linux

make rpm

Create Red Hat-style binary RPM package. Requires RPM v4 or later.

make srpm

This runs make dist to create a pristine source tarball, then creates a Red Hat-style source RPM package from the tarball. Requires RPM v4 or later.

make deb

Create Debian-style binary package. Requires dpkg.

Mac

make dmg

Create Mac package/disk image. This requires pkgbuild and productbuild, which are installed by default on OS X 10.7 and later and which can be obtained by installing Xcode 3.2.6 (with the “Unix Development” option) on OS X 10.6. Packages built in this manner can be installed on OS X 10.5 and later, but they must be built on OS X 10.6 or later.

make udmg

This creates a Mac package/disk image that contains universal x86-64/i386/ARM binaries. The following CMake variables control which architectures are included in the universal binaries. Setting any of these variables to an empty string excludes that architecture from the package.

You should first use CMake to configure i386, ARMv7, ARMv7s, and/or ARMv8 sub-builds of libjpeg-turbo (see “Build Recipes” and “Building libjpeg-turbo for iOS” above) in build directories that match those specified in the aforementioned CMake variables. Next, configure the primary build of libjpeg-turbo as an out-of-tree build, and build it. Once the primary build has been built, run make udmg from the build directory. The packaging system will build the sub-builds, use lipo to combine them into a single set of universal binaries, then package the universal binaries in the same manner as make dmg.

Cygwin

make cygwinpkg

Build a Cygwin binary package.

Windows

If using NMake:

cd {build_directory}
nmake installer

If using MinGW:

cd {build_directory}
make installer

If using the Visual Studio IDE, build the “installer” target.

The installer package (libjpeg-turbo-{version}[-gcc|-vc][64].exe) will be located under {build_directory}. If building using the Visual Studio IDE, then the installer package will be located in a subdirectory with the same name as the configuration you built (such as {build_directory}\Debug\ or {build_directory}\Release).

Building a Windows installer requires the Nullsoft Install System. makensis.exe should be in your PATH.

Regression testing

The most common way to test libjpeg-turbo is by invoking make test (Un*x) or nmake test (Windows command line) or by building the “RUN_TESTS” target (Visual Studio IDE), once the build has completed. This runs a series of tests to ensure that mathematical compatibility has been maintained between libjpeg-turbo and libjpeg v6b. This also invokes the TurboJPEG unit tests, which ensure that the colorspace extensions, YUV encoding, decompression scaling, and other features of the TurboJPEG C and Java APIs are working properly (and, by extension, that the equivalent features of the underlying libjpeg API are also working.)

Invoking make testclean (Un*x) or nmake testclean (Windows command line) or building the “testclean” target (Visual Studio IDE) will clean up the output images generated by the tests.

On Un*x platforms, more extensive tests of the TurboJPEG C and Java wrappers can be run by invoking make tjtest. These extended TurboJPEG tests essentially iterate through all of the available features of the TurboJPEG APIs that are not covered by the TurboJPEG unit tests (including the lossless transform options) and compare the images generated by each feature to images generated using the equivalent feature in the libjpeg API. The extended TurboJPEG tests are meant to test for regressions in the TurboJPEG wrappers, not in the underlying libjpeg API library.

Source

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