framebuffer 保存 bmp图片格式

    最近需要完成一个从framebuffer中进行读取，然后将内存的东西保存为bmp图片格式，我的其他博客内容对framebuffer进行详细的讲解，以及bmp的格式进行详细的讲解。

    之前从网上看到了一些保存bmp图片的代码，在本地执行都会出现问题，本人就进行了自己编写，可以指定文件的文件名和文件类型

   也可以从github中获取源码：

直接看代码：https://github.com/Guazhen/Framebuffer_shot

  

#include <linux/fb.h>#include <stdio.h>#include <stdint.h> #include <fcntl.h>#include <sys/mman.h>#include <sys/ioctl.h> #include <getopt.h>#include <strings.h>#include <unistd.h>typedef unsigned short WORD;typedef unsigned int DWORD;typedef unsigned long LONG;typedef struct tagBITMAPFILEHEADER {WORD bfType;DWORD bfSize;WORD bfReserved1;WORD bfReserved2;DWORD bfOffBits; } __attribute__((packed)) BITMAPFILEHEADER;typedef struct tagBITMAPINFOHEADER{DWORD biSize; /*info header size in bytes*/DWORD biWidth; /*widht of image*/DWORD biHeight;/*height of image*/WORD biPlanes;/*number of colour planes*/ WORD biBitCount;/*bits per pixel*/DWORD biCompression;/*compression type*/DWORD biSizeImage;/*image size meter*/DWORD biXPelsPerMeter;/*pixels per meter*/DWORD biYPelsPerMeter;/*pexels per meter*/DWORD biClrUsed;/*number of colour*/DWORD biClrImportant;/*important colour*/} __attribute__((packed)) BITMAPINFOHEADER;int output_file;int type_file;struct fb_fix_screeninfo finfo;struct fb_var_screeninfo vinfo;static const struct option long_options[]=  {       {"output",1,NULL,'o'},       {"t",1,NULL,'t'},         {NULL,0,NULL,0}  }; static void usage(void)  {  fprintf(stderr,  "imax6 [option]...\n"  "  -o|--output               Output the filename.\n"  "  -t|--type               Output the type of thefilename.\n""  -h|--help               help information.\n"       );  };static void image_bmp( const char *filename){printf("starting bmp..\n");char tmpbufilename[126] = {0};if( NULL != filename){strcpy(tmpbufilename, filename);strcat(tmpbufilename,".bmp");}else{strcpy(tmpbufilename,"screen.bmp");}FILE *fp;BITMAPFILEHEADER    bmfh;        BITMAPINFOHEADER    bmih;        ((unsigned char *)&bmfh.bfType)[0] = 'B';        ((unsigned char *)&bmfh.bfType)[1] = 'M';        bmfh.bfSize =  sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + vinfo.yres * vinfo.xres * 4;        bmfh.bfReserved1 = 0;        bmfh.bfReserved2 = 0;        bmfh.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);        bmih.biSize = sizeof(BITMAPINFOHEADER);        bmih.biWidth = vinfo.xres;        bmih.biHeight = vinfo.yres;        bmih.biPlanes = 1;        bmih.biBitCount = 32;        bmih.biCompression = 0;        bmih.biSizeImage = 0; /*说明图像的大小，以字节为单位。当用BI_RGB格式时，总设置为0*/        bmih.biXPelsPerMeter = 0; /*缺省值*/        bmih.biYPelsPerMeter = 0;        bmih.biClrUsed = 0; /*说明位图实际使用的调色板索引数，0：使用所有的调色板索引*/        bmih.biClrImportant = 0; /*说明对图像显示有重要影响的颜色索引的数目，如果是0，表示都重要*/printf("tmpbufilename = %s\n",tmpbufilename);        FILE* image_file = fopen(tmpbufilename,"a");if( NULL == image_file){printf("image fopen fail\n");}        fwrite(&bmfh, sizeof(BITMAPFILEHEADER),1,image_file);        fwrite(&bmih, sizeof(BITMAPINFOHEADER),1,image_file);        FILE *raw_file = fopen( "test.raw","rb");if( NULL == raw_file){printf("rawfile fopen fail..\n");}/*fgetc是一种计算机语言中的函数。意为从文件指针stream指向的文件中读取一个字符，读取一个字节后，光标位置后移一个字节。格式：int fgetc(FILE *stream);*/        //int ch = fgetc(raw_file);int ch = getc(raw_file);/*for(y = 0; y < vinfo.yres; y+){  for(x = 0; x < vinfo.xres; x++)  {  long location = (x + vinfo.xoffset) * (vinfo.bits_per_pixel/8) + (y + vinfo.yoffset) * finfo.line_length;             write(image_file, fbp + location, 4);  }  }  */int x, y;   for( y = vinfo.yres - 1; y >= 0; y--){for(x = 0; x < vinfo.xres; x++){/*字节数*/long location = (x + vinfo.xoffset) * (vinfo.bits_per_pixel/8) + (y + vinfo.yoffset) * finfo.line_length;fseek(raw_file, location, SEEK_SET);ch = fgetc(raw_file);fputc(ch,image_file);ch = fgetc(raw_file);fputc(ch,image_file);ch = fgetc(raw_file);fputc(ch,image_file);ch = fgetc(raw_file);fputc(ch,image_file); }}/*while( ch != EOF)        {ch = fgetc(raw_file);                fputc(ch,image_file);ch = fgetc(raw_file);                fputc(ch,image_file);ch = fgetc(raw_file);                fputc(ch,image_file);ch = fgetc(raw_file);                fputc(ch,image_file);                        }*/        fp = popen("rm ./test.raw","r");        pclose(fp);fclose(raw_file);fclose(image_file);printf("ending bmp\n");}int main(int argc, char **argv){int opt = 0;int options_index = 0;char *tmp = NULL;char filename[126] = {0};char type[126] = {0};if(argc == 1){usage();return 2;}/* 解析命令行参数*/while((opt=getopt_long(argc,argv,"o:t:h?",long_options,&options_index))!=EOF )  {  switch(opt)  {    case 'o': output_file=1;sprintf(filename,"%s",optarg);break;  case 't': type_file=1;sprintf(type,"%s",optarg);break;   case 'h':  case '?': usage();return 2;break;  }  }int fb_fd = open("/dev/fb0",O_RDWR);if(fb_fd == -1){printf("open fail..\n");return -1;}ioctl(fb_fd, FBIOGET_VSCREENINFO, &vinfo);ioctl(fb_fd, FBIOGET_FSCREENINFO, &finfo);long screensize = vinfo.yres_virtual * finfo.line_length;FILE *fp = popen("bash ./test.sh","r");pclose(fp);//bmp if( output_file && type_file ){if( !strcmp(type,"bmp")){image_bmp(filename);}else if( !strcmp(type,"png")){printf("png type = %s\n",type);}else{printf("unkown\n");}}else{usage();return 2;}close(fb_fd);return 0;}