[JPEG] how to compile JPEG turbo library files on different platforms

This article introduces how to compile on different platforms jpeg-turbo The library files .

Mac/Linux platform

Mac/Linux Platform compilation jpeg-turbo The library files （libturbojpeg） The process is as follows ：

1. download jpeg-turbo Source code

Source code github Address ：libjpeg-turbo

After downloading, switch the branch to 2.0.5 edition （ Here to 2.0.5 Version example , Other versions need to switch to the corresponding branch ）：

git clone https://github.com/libjpeg-turbo/libjpeg-turbo.git
cd libjpeg-turbo
git switch -c 2.0.5

2. compile

mkdir build
cd build
cmake .. && make -j8

After compiling , The static and dynamic libraries compiled are in build/ Under the table of contents .

Mac Under the jpeg-turbo The library files ：

libturbojpeg.a
libturbojpeg.dylib

Android platform

Android Compiling under the platform jpeg-turbo The process of library file is the same as that of Mac/Linux Broadly similar , The difference is that you need to use ndk Cross compile .

1. Download the source code and switch to 2.0.5
2. compile

32 Bit compilation ：

cmake -DCMAKE_TOOLCHAIN_FILE=/Users/lxq/Library/Android/sdk/ndk-bundle/build/cmake/android.toolchain.cmake -DANDROID_ABI=armeabi-v7a -DANDROID_ARM_NEON=ON -DAPP_PLATFORM=19 ..
make -j8

64 Bit compilation ：

cmake -DCMAKE_TOOLCHAIN_FILE=/Users/lxq/Library/Android/sdk/ndk-bundle/build/cmake/android.toolchain.cmake -DANDROID_ABI=arm64-v8a -DANDROID_ARM_NEON=ON -DAPP_PLATFORM=19 ..
make -j8