windows7 64位机上，libjpeg-turbo的安装和使用

libjpeg-turbo是对libjpeg的扩展，支持SIMD指令，如X86架构的MMX、SSE、SSE2、3DNOW，ARM架构的NEON，在对jpeg进行编码和解码的过程中能提高速度。

         MMX：多媒体扩展的缩写，第六代CPU芯片重要特点，57条指令。

         SSE2：SIMD流技术扩展2,144个新增指令，被MMX优化过的程序很容易被SSE2进行更深层次的优化。

         NEON：可加速多媒体和信号处理算法，它是ARM系列处理器的128位SIMD架构扩展。

         在速度上，libjpeg-turbo一般是libjpeg的2-4倍。它既能调用libjpegAPI，又可调用TurboJPEG API。可以使用libjpeg-turbo替代libjpeg。

 

编译libjpeg-turbo：

1、  从https://sourceforge.net/projects/libjpeg-turbo/通过TortoiseSVN下载libjpeg-turbo最新源代码，将其保存到D:\soft\libjpeg-turbo文件夹下；

2、  从http://www.cmake.org/下载最新版的CMake，并安装；

3、  在D:\soft\libjpeg-turbo文件夹下手动创建一个vs2010文件夹；

4、  打开CMake，其中where isthe source code选项，选择D:/soft/libjpeg-turbo/libjpeg-turbo；where to build thebinaries选项，选择D:/soft/libjpeg-turbo/vs2010；

5、  点击Configure，在弹出的对话框中选择VisualStudio 10，其它默认，点击Finish；

6、  如果有红色框显示，继续点击Configure(将CMAKE_INSTALL_PREFIX中的value改为D:\libjpeg-turbo)；

7、  点击Generate，此时会在vs2010文件夹中看到libjpeg-turbo.sln文件；

8、  从https://sourceforge.net/projects/nasm/下载最新版的nasm；

9、  将nasm安装到D:\ProgramFiles\NASM文件夹下，并将其中的nasm.exe和ndisasm.exe两个文件拷贝到C:\ProgramFiles\Microsoft Visual Studio 10.0\VC\bin下(如果是64位，则拷贝到C:\ProgramFiles (x86)\Microsoft Visual Studio 10.0\VC\bin)，将其D:\ProgramFiles\NASM添加到系统环境变量中；

10、             打开libjpeg-turbo.sln，分别在Debug和Release下，选择Solution Explorer里的Solution libjpeg-turbo，点击右键，运行”Rebuild Solution”，然后选中INSTALL, build；

11、             全部完成后会在D:\libjpeg-turbo文件夹下生成bin、doc、lib、include四个文件夹，编译成功(说明：默认的Debgu和Release下生成的所有文件夹都相同，注意区分)；

12、             打开vs2010，新建一个控制台应用程序，为vs2010配置libjpeg-turbo环境：选择View--> Properties Manager-->分别选中Debug和Release上的Microsoft.Cpp.Win32.user，点击右键-->Properties：VC++ Directories，Include Directories：D:\libjpeg-turbo\include；Library Directories：D:\libjpeg-turbo\lib；

13、             选中工程-->Properties-->Configuration Properties-->Linker-->Input-->AdditionalDependencies：Debug和Release，添加相应的.lib库；

14、             将D:\libjpeg-turbo\bin加入到windows系统环境变量Path中，重启。

 

新建一个控制台工程：

1、将jconfig.h文件拷贝到该工程目录下；

2、stdafx.h:

#pragma once#include "targetver.h"#include <stdio.h>#include "D:/Soft/libjpegturbo/libjpegturbo/jpeglib.h"

3、stdafx.cpp:

#include "stdafx.h"// TODO: reference any additional headers you need in STDAFX.H// and not in this file#ifdef _DEBUG#pragma comment(lib, "D:/Soft/libjpegturbo/vs2010/Debug/jpeg-static.lib")#else#pragma comment(lib, "D:/Soft/libjpegturbo/vs2010/Release/jpeg-static.lib")#endif

4、main.cpp:

#include "stdafx.h"#include <iostream>#include <stdio.h>#include <setjmp.h>#include <string.h>#include <stdlib.h>using namespace std;int read_JPEG_file(string strImageName){/* This struct contains the JPEG decompression parameters and pointers to     * working space (which is allocated as needed by the JPEG library).     */struct jpeg_decompress_struct cinfo;/* We use our private extension JPEG error handler.     * Note that this struct must live as long as the main JPEG parameter     * struct, to avoid dangling-pointer problems.     */struct jpeg_error_mgr jerr;/* More stuff */FILE * infile;/* source file */JSAMPARRAY buffer;/* Output row buffer */int row_stride;/* physical row width in output buffer *//* In this example we want to open the input file before doing anything else, * so that the setjmp() error recovery below can assume the file is open. * VERY IMPORTANT: use "b" option to fopen() if you are on a machine that * requires it in order to read binary files. */if ((infile = fopen(strImageName.c_str(), "rb")) == NULL) {fprintf(stderr, "can't open %s\n", strImageName);return -1;}/* Step 1: allocate and initialize JPEG decompression object *//* We set up the normal JPEG error routines, then override error_exit. */cinfo.err = jpeg_std_error(&jerr);/* Establish the setjmp return context for my_error_exit to use. *///if (setjmp(jerr.setjmp_buffer)) {/* If we get here, the JPEG code has signaled an error. * We need to clean up the JPEG object, close the input file, and return. *///jpeg_destroy_decompress(&cinfo);//fclose(infile);//return -1;//}/* Now we can initialize the JPEG decompression object. */jpeg_create_decompress(&cinfo);/* Step 2: specify data source (eg, a file) */jpeg_stdio_src(&cinfo, infile);/* Step 3: read file parameters with jpeg_read_header() */jpeg_read_header(&cinfo, TRUE);/* We can ignore the return value from jpeg_read_header since *   (a) suspension is not possible with the stdio data source, and     *   (b) we passed TRUE to reject a tables-only JPEG file as an error.     * See libjpeg.txt for more info.     */printf("image_width = %d\n", cinfo.image_width);printf("image_height = %d\n", cinfo.image_height);printf("num_components = %d\n", cinfo.num_components);/* Step 4: set parameters for decompression *//* In this example, we don't need to change any of the defaults set by     * jpeg_read_header(), so we do nothing here.     */printf("enter scale M/N:\n");//scanf("%d/%d", &cinfo.scale_num, &cinfo.scale_denom);cinfo.scale_num = 2;cinfo.scale_denom = 4;printf("scale to : %d/%d\n", cinfo.scale_num, cinfo.scale_denom);/* Step 5: Start decompressor */jpeg_start_decompress(&cinfo);/* We can ignore the return value since suspension is not possible     * with the stdio data source.     *///输出的图象的信息printf("output_width = %d\n", cinfo.output_width);printf("output_height = %d\n", cinfo.output_height);printf("output_components = %d\n", cinfo.output_components);/* We may need to do some setup of our own at this point before reading * the data.  After jpeg_start_decompress() we have the correct scaled     * output image dimensions available, as well as the output colormap     * if we asked for color quantization.     * In this example, we need to make an output work buffer of the right size.     */ /* JSAMPLEs per row in output buffer */row_stride = cinfo.output_width * cinfo.output_components;/* Make a one-row-high sample array that will go away when done with image */buffer = (*cinfo.mem->alloc_sarray)((j_common_ptr) &cinfo, JPOOL_IMAGE, row_stride, 1);/* Step 6: while (scan lines remain to be read) */    /*           jpeg_read_scanlines(...); *//* Here we use the library's state variable cinfo.output_scanline as the     * loop counter, so that we don't have to keep track ourselves.     */while (cinfo.output_scanline < cinfo.output_height) {    /* jpeg_read_scanlines expects an array of pointers to scanlines.     * Here the array is only one element long, but you could ask for     * more than one scanline at a time if that's more convenient.     */jpeg_read_scanlines(&cinfo, buffer, 1);/* Assume put_scanline_someplace wants a pointer and sample count. *///put_scanline_someplace(buffer[0], row_stride);}/* Step 7: Finish decompression */jpeg_finish_decompress(&cinfo);    /* We can ignore the return value since suspension is not possible     * with the stdio data source.     *//* Step 8: Release JPEG decompression object *//* This is an important step since it will release a good deal of memory. */jpeg_destroy_decompress(&cinfo);/* After finish_decompress, we can close the input file. * Here we postpone it until after no more JPEG errors are possible, * so as to simplify the setjmp error logic above.  (Actually, I don't * think that jpeg_destroy can do an error exit, but why assume anything...) */fclose(infile);    /* At this point you may want to check to see whether any corrupt-data     * warnings occurred (test whether jerr.pub.num_warnings is nonzero).     */return 0;}int write_JPEG_file(string strImageName, int quality){unsigned char* image_buffer;/* Points to large array of R,G,B-order data */int image_height = 200;/* Number of rows in image */int image_width = 400;/* Number of columns in image *//* This struct contains the JPEG compression parameters and pointers to     * working space (which is allocated as needed by the JPEG library).     * It is possible to have several such structures, representing multiple     * compression/decompression processes, in existence at once.  We refer     * to any one struct (and its associated working data) as a "JPEG object".     */    struct jpeg_compress_struct cinfo;/* This struct represents a JPEG error handler.  It is declared separately     * because applications often want to supply a specialized error handler     * (see the second half of this file for an example).  But here we just     * take the easy way out and use the standard error handler, which will     * print a message on stderr and call exit() if compression fails.     * Note that this struct must live as long as the main JPEG parameter     * struct, to avoid dangling-pointer problems.     */struct jpeg_error_mgr jerr;/* More stuff */FILE * outfile;/* target file */JSAMPROW row_pointer[1];/* pointer to JSAMPLE row[s] */int row_stride;/* physical row width in image buffer *//* Step 1: allocate and initialize JPEG compression object */    /* We have to set up the error handler first, in case the initialization     * step fails.  (Unlikely, but it could happen if you are out of memory.)     * This routine fills in the contents of struct jerr, and returns jerr's     * address which we place into the link field in cinfo.     */cinfo.err = jpeg_std_error(&jerr);/* Now we can initialize the JPEG compression object. */jpeg_create_compress(&cinfo);/* Step 2: specify data destination (eg, a file) */    /* Note: steps 2 and 3 can be done in either order. */    /* Here we use the library-supplied code to send compressed data to a     * stdio stream.  You can also write your own code to do something else.     * VERY IMPORTANT: use "b" option to fopen() if you are on a machine that     * requires it in order to write binary files.     */if ((outfile = fopen(strImageName.c_str(), "wb")) == NULL) {fprintf(stderr, "can't open %s\n", strImageName);//exit(1);return -1;}jpeg_stdio_dest(&cinfo, outfile);/* Step 3: set parameters for compression *//* First we supply a description of the input image. * Four fields of the cinfo struct must be filled in: */cinfo.image_width = image_width; /* image width and height, in pixels */cinfo.image_height = image_height;cinfo.input_components = 3;/* # of color components per pixel */cinfo.in_color_space = JCS_RGB; /* colorspace of input image *//* Now use the library's routine to set default compression parameters. * (You must set at least cinfo.in_color_space before calling this, * since the defaults depend on the source color space.) */jpeg_set_defaults(&cinfo);/* Now you can set any non-default parameters you wish to. * Here we just illustrate the use of quality (quantization table) scaling: */jpeg_set_quality(&cinfo, quality, TRUE /* limit to baseline-JPEG values */);/* Step 4: Start compressor *//* TRUE ensures that we will write a complete interchange-JPEG file. * Pass TRUE unless you are very sure of what you're doing. */jpeg_start_compress(&cinfo, TRUE);/* Step 5: while (scan lines remain to be written) *//*           jpeg_write_scanlines(...); *//* Here we use the library's state variable cinfo.next_scanline as the * loop counter, so that we don't have to keep track ourselves. * To keep things simple, we pass one scanline per call; you can pass * more if you wish, though. */row_stride = image_width * 3;/* JSAMPLEs per row in image_buffer */image_buffer = new unsigned char[row_stride * cinfo.image_height];memset(image_buffer, 0xff, row_stride * cinfo.image_height);int line = 0;//while (cinfo.next_scanline < cinfo.image_height) {while (line < cinfo.image_height) {/* jpeg_write_scanlines expects an array of pointers to scanlines. * Here the array is only one element long, but you could pass * more than one scanline at a time if that's more convenient. *///row_pointer[0] = &image_buffer[cinfo.next_scanline * row_stride];row_pointer[0] = &image_buffer[line * row_stride];jpeg_write_scanlines(&cinfo, row_pointer, 1);line ++;}delete image_buffer;/* Step 6: Finish compression */jpeg_finish_compress(&cinfo);/* After finish_compress, we can close the output file. */fclose(outfile);/* Step 7: release JPEG compression object *//* This is an important step since it will release a good deal of memory. */jpeg_destroy_compress(&cinfo);return 0;}struct Image{int bpp;int width;int height;unsigned char* data;};struct jerror_mgr{jpeg_error_mgr base;jmp_buf        jmp;};METHODDEF(void) jerror_exit(j_common_ptr jinfo){jerror_mgr* err = (jerror_mgr*)jinfo->err;longjmp(err->jmp, 1);}METHODDEF(void) joutput_message(j_common_ptr){}bool Image_LoadJpeg(Image* image, unsigned char* img_data, unsigned int img_size){jpeg_decompress_struct jinfo;jerror_mgr jerr;jinfo.err = jpeg_std_error(&jerr.base);jerr.base.error_exit = jerror_exit;jerr.base.output_message = joutput_message;jpeg_create_decompress(&jinfo);image->data = NULL;if (setjmp(jerr.jmp)) goto bail;jpeg_mem_src(&jinfo, img_data, img_size);if (jpeg_read_header(&jinfo, TRUE) != JPEG_HEADER_OK) goto bail;jinfo.dct_method = JDCT_FLOAT; // change this to JDCT_ISLOW on Android/iOSif (!jpeg_start_decompress(&jinfo)) goto bail;if (jinfo.num_components != 1 && jinfo.num_components != 3) goto bail;image->data = new (std::nothrow) unsigned char [jinfo.output_width * jinfo.output_height * jinfo.output_components];if (!image->data) goto bail;{JSAMPROW ptr = image->data;while (jinfo.output_scanline < jinfo.output_height){if (jpeg_read_scanlines(&jinfo, &ptr, 1) != 1) goto bail;ptr += jinfo.output_width * jinfo.output_components;}}if (!jpeg_finish_decompress(&jinfo)) goto bail;image->bpp = jinfo.output_components;image->width = jinfo.output_width;image->height = jinfo.output_height;jpeg_destroy_decompress(&jinfo);return true;bail:jpeg_destroy_decompress(&jinfo);if (image->data) delete [] image->data;return false;}struct ImageData {unsigned char *pixels;long  width;long height;};int TestImage(string strSrcImageName, string strDstImageName){//readstruct jpeg_decompress_struct cinfo_decompress;FILE* infile;int row_stride;struct jpeg_error_mgr jerr;if ((infile = fopen(strSrcImageName.c_str(), "rb")) == NULL) {fprintf(stderr, "can't open %s\n", strSrcImageName);return -1;}cinfo_decompress.err = jpeg_std_error(&jerr);jpeg_create_decompress(&cinfo_decompress);jpeg_stdio_src(&cinfo_decompress, infile);int ret = jpeg_read_header(&cinfo_decompress, TRUE);if (ret != JPEG_HEADER_OK) return -1;jpeg_start_decompress(&cinfo_decompress);row_stride = cinfo_decompress.output_width * cinfo_decompress.output_components;int buffer_height = 1;JSAMPARRAY buffer = (JSAMPARRAY)malloc(sizeof(JSAMPROW) * buffer_height);buffer[0] = (JSAMPROW)malloc(sizeof(JSAMPLE) * row_stride);//JSAMPARRAY buffer = (*cinfo_decompress.mem->alloc_sarray)((j_common_ptr)&cinfo_decompress, JPOOL_IMAGE, row_stride, 1);ImageData *imageData;imageData = new ImageData;imageData->width = cinfo_decompress.output_width;imageData->height = cinfo_decompress.output_height;imageData->pixels = new unsigned char [cinfo_decompress.output_width * cinfo_decompress.output_height * cinfo_decompress.output_components];long counter = 0;while (cinfo_decompress.output_scanline < cinfo_decompress.output_height) {jpeg_read_scanlines(&cinfo_decompress, buffer, 1);memcpy(imageData->pixels + counter, buffer[0], row_stride);counter += row_stride;}jpeg_finish_decompress(&cinfo_decompress);jpeg_destroy_decompress(&cinfo_decompress);fclose(infile);//writeunsigned char* image_buffer;int image_height = cinfo_decompress.output_height;int image_width = cinfo_decompress.output_width;FILE * outfile;JSAMPROW row_pointer[1];int row_stride_dst;struct jpeg_compress_struct cinfo_compress;cinfo_compress.err = jpeg_std_error(&jerr);jpeg_create_compress(&cinfo_compress);if ((outfile = fopen(strDstImageName.c_str(), "wb")) == NULL) {fprintf(stderr, "can't open %s\n", strDstImageName);//exit(1);return -1;}jpeg_stdio_dest(&cinfo_compress, outfile);cinfo_compress.image_width = image_width;cinfo_compress.image_height = image_height;cinfo_compress.input_components = 3;cinfo_compress.in_color_space = JCS_YCbCr;int quality = 70;jpeg_set_defaults(&cinfo_compress);jpeg_set_quality(&cinfo_compress, quality, TRUE);jpeg_start_compress(&cinfo_compress, TRUE);row_stride_dst = image_width * 3;image_buffer = new unsigned char[row_stride_dst * cinfo_compress.image_height];memcpy(image_buffer, imageData->pixels, row_stride_dst * cinfo_compress.image_height);while (cinfo_compress.next_scanline < cinfo_compress.image_height) {row_pointer[0] = &image_buffer[cinfo_compress.next_scanline * row_stride_dst];jpeg_write_scanlines(&cinfo_compress, row_pointer, 1);}jpeg_finish_compress(&cinfo_compress);fclose(outfile);jpeg_destroy_compress(&cinfo_compress);if (imageData) {delete imageData;imageData = NULL;}if (image_buffer)delete [] image_buffer;return 0;}int main(int argc, char* argv[]){string strImageName = "1.jpg";int flag1 = read_JPEG_file(strImageName);if (flag1 == 0) cout<<"read ok!"<<endl;else cout<<"read error!"<<endl;strImageName = "2.bmp";int flag2 = write_JPEG_file(strImageName, 80);if (flag2 == 0) cout<<"write ok!"<<endl;else cout<<"write error!"<<endl;string strSrcImageName = "a.jpg";string strDstImageName = "b.jpg";int flag3 = TestImage(strSrcImageName, strDstImageName);if (flag3 == 0) cout<<"test ok!"<<endl;else cout<<"test error!"<<endl;return 0;}

参考文献：

1、  http://libjpeg-turbo.virtualgl.org/

2、  http://www.linuxsir.org/bbs/thread374093.html

3、  http://blog.sina.com.cn/s/blog_a5b979d30101af56.html

4、  http://blog.csdn.net/jwzhangjie/article/details/8807409

5、  http://blog.csdn.net/hongwazi_2010/article/details/9153087