mingw(gcc)编译libjpeg-turbo

10km

发布于 2022-05-07 10:16:15

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发布于 2022-05-07 10:16:15

最近的工作需要读写jpeg图像,网上找了半天，发现libjpeg-turbo是个不错的选择。 libjpeg-turbo是与libjpeg接口兼容的一个jpeg编/解码库，其主要的特点就是利用SIMD指令(如X86架构的MMX/SSE/SSE2，ARM架构的NEON)来加速jpeg图像的编/解码,相比被广泛使用的libjpeg，编码和解码性能提高2~4倍左右。

下面是其官网的说明：

libjpeg-turbo is a JPEG image codec that uses SIMD instructions (MMX, SSE2, NEON) to accelerate baseline JPEG compression and decompression on x86, x86-64, and ARM systems. On such systems, libjpeg-turbo is generally 2-4x as fast as libjpeg, all else being equal. On other types of systems, libjpeg-turbo can still outperform libjpeg by a significant amount, by virtue of its highly-optimized Huffman coding routines. In many cases, the performance of libjpeg-turbo rivals that of proprietary high-speed JPEG codecs.

官网上Downloads已经有编译好的windows平台的用于gcc/vc编译器的库可以下载，目前的最新版本是1.4.2，也可以下载源码(libjpeg-turbo-1.4.2.tar.gz)自己编译，下载地址为: http://nchc.dl.sourceforge.net/project/libjpeg-turbo/1.4.2/libjpeg-turbo-1.4.2.tar.gz，下面讲述如何在Windows下用gcc对libjpeg-turbo源进行编译。

安装NASM

因为libjpeg-turbo的源代码中用到了SIMD汇编指令，所以要编译源代码，就要先安装NASM,NASM全称The Netwide Assembler，是一款基于80x86和x86-64平台的汇编语言编译程序。可以在sourceforge.net的地址下载，也可以在其新的独立官网nasm.us下载

我下的是2.07版本(nasm-2.07-installer.exe)，默认安装到C:\Program Files (x86)\NASM,然后把这个位置添加到搜索路径(PATH环境变量)中。

环境变量设置好之后，需要reboot或logout。再次打开电脑，在命令行下执行”set path”,显示修改的环境变量已经生效

安装CMAKE

去cmake官网(https://cmake.org)下载一个最新版本，解压到本地文件夹，并像安装NASM一样将bin文件夹设置到搜索路径(PATH环境变量)中

安装MinGW

关于windows下mingw的安装网上有很教程，这里不多说了。

CMAKE编译

1. 源代码解压

将libjpeg-turbo-1.4.2.tar.gz解压到本地文件夹下 (D:\os.package\cpp\libjpeg\libjpeg-turbo-1.4.2)

2. 创建一个build目录

D:\os.package\cpp\libjpeg>mkdir libjpeg-turbo-1.4.2.prj D:\os.package\cpp\libjpeg>cd libjpeg-turbo-1.4.2.prj

3.生成Makefile

在创建的build目录下执行：

D:\os.package\cpp\libjpeg\libjpeg-turbo-1.4.2.prj>cmake ..\libjpeg-turbo-1.4.2 -G “Eclipse CDT4 - MinGW Makefiles” -DCMAKE_BUILD_TYPE:STRING=RELEASE -DCMAKE_GNUtoMS:BOOL=ON – The C compiler identification is GNU 5.2.0 – Could not determine Eclipse version, assuming at least 3.6 (Helios). Adjust C MAKE_ECLIPSE_VERSION if this is wrong. – Check for working C compiler: P:/MinGW/mingw64/bin/gcc.exe – Check for working C compiler: P:/MinGW/mingw64/bin/gcc.exe – works – Detecting C compiler ABI info – Detecting C compiler ABI info - done – Detecting C compile features – Detecting C compile features - done – CMAKE_BUILD_TYPE = RELEASE – VERSION = 1.4.2, BUILD = 20160115 – Arithmetic encoding support enabled – Arithmetic decoding support enabled – TurboJPEG C wrapper enabled – TurboJPEG Java wrapper disabled – In-memory source/destination managers enabled – 64-bit build – Install directory = c:/libjpeg-turbo-gcc64 – Building x86_64 SIMD extensions – Configuring done – Generating done – Build files have been written to: D:/os.package/cpp/libjpeg/libjpeg-turbo-1.4.2.prj

可选项说明： -G “Eclipse CDT4 - MinGW Makefiles”

指定生成 Eclipse+MinGW格式的工程文件，这样可以在eclipse环境下编译

-DCMAKE_BUILD_TYPE:STRING=RELEASE

设置编译类型为RELEASE，不设置默认也为RELASE

-DCMAKE_GNUtoMS:BOOL=ON

为动态库(DLL)生成MSVC格式的.lib,这样VC编译的项目就可以使用GCC生成的DLL,参见GNUtoMS说明。如果不需要可以不加。

4.编译

执行make,然后就是几分钟的编译过程。。。

D:\os.package\cpp\libjpeg\libjpeg-turbo-1.4.2.prj>make Scanning dependencies of target simd [ 0%] Generating jfdctflt-sse-64.obj [ 1%] Generating jccolor-sse2-64.obj [ 1%] Generating jcgray-sse2-64.obj [ 2%] Generating jcsample-sse2-64.obj [ 2%] Generating jdcolor-sse2-64.obj [ 2%] Generating jdmerge-sse2-64.obj [ 3%] Generating jdsample-sse2-64.obj [ 3%] Generating jfdctfst-sse2-64.obj [ 4%] Generating jfdctint-sse2-64.obj [ 4%] Generating jidctflt-sse2-64.obj [ 5%] Generating jidctfst-sse2-64.obj [ 5%] Generating jidctint-sse2-64.obj [ 5%] Generating jidctred-sse2-64.obj [ 6%] Generating jquantf-sse2-64.obj [ 6%] Generating jquanti-sse2-64.obj [ 6%] Built target simd Scanning dependencies of target jpeg-static [ 7%] Building C object CMakeFiles/jpeg-static.dir/jcapimin.c.obj [ 7%] Building C object CMakeFiles/jpeg-static.dir/jcapistd.c.obj [ 8%] Building C object CMakeFiles/jpeg-static.dir/jccoefct.c.obj [ 8%] Building C object CMakeFiles/jpeg-static.dir/jccolor.c.obj [ 9%] Building 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Microsoft (R) Library Manager Version 10.00.30319.01 Copyright (C) Microsoft Corporation. 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Microsoft (R) Library Manager Version 10.00.30319.01 Copyright (C) Microsoft Corporation. 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编译完成之后所有的生成文件都在build文件夹的根目录下