嵌入式

嵌入式linux截屏程序

2019-07-12 20:09发布

站内文章 / 嵌入式Linux
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基于网上一个代码改的。 源地址：http://blog.csdn.net/z1179675084/article/details/14645359 // 注意，由于fb_bpp = 16的情况没用到，以下修改后的代码只调整了fb_bpp不为16的情况 #include #include #include #include #include #include #include #include #include #include #include #include #include static unsigned int capframe = 0; static unsigned char filename[30]; FILE *bmpFile; unsigned char bmp_head_t[] = { 0x42,0x4d,0x42,0x58,0x02,0x00,0x00,0x00,0x00,0x00, 0x42,0x00,0x00,0x00,0x28,0x00,0x00,0x00,0xf0,0x00, 0x00,0x00,0x40,0x01,0x00,0x00,0x01,0x00,0x10,0x00, 0x03,0x00,0x00,0x00,0x00,0x58,0x02,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,0x00,0xf8,0x00,0x00,0xe0,0x07, 0x00,0x00,0x1f,0x00,0x00,0x00 }; static int fb_bpp; //14byte typedef struct { char cfType[2]; /* 文件类型, 必须为 "BM" (0x4D42)*/ unsigned int cfSize; /* 文件的大小(字节) */ unsigned int cfReserved; /* 保留, 必须为 0 */ unsigned int cfoffBits; /* 位图阵列相对于文件头的偏移量(字节)*/ }__attribute__((packed)) BITMAPFILEHEADER; /* 文件头结构 */ //40byte typedef struct { unsigned int ciSize; /* size of BITMAPINFOHEADER */ unsigned int ciWidth; /* 位图宽度(像素) */ unsigned int ciHeight; /* 位图高度(像素) */ unsigned short ciPlanes; /* 目标设备的位平面数, 必须置为1 */ unsigned short ciBitCount; /* 每个像素的位数, 1,4,8或24 */ unsigned int ciCompress; /* 位图阵列的压缩方法,0=不压缩 */ unsigned int ciSizeImage; /* 图像大小(字节) */ unsigned int ciXPelsPerMeter;/* 目标设备水平每米像素个数 */ unsigned int ciYPelsPerMeter;/* 目标设备垂直每米像素个数 */ unsigned int ciClrUsed; /* 位图实际使用的颜 {MOD}表的颜 {MOD}数 */ unsigned int ciClrImportant; /* 重要颜 {MOD}索引的个数 */ }__attribute__((packed)) BITMAPINFOHEADER; /* 位图信息头结构 */ BITMAPFILEHEADER FileHead; BITMAPINFOHEADER InfoHead; unsigned char bmp_head[54]; static int fb_fp = -1; static char *fb_addr = NULL; int width=0; int height=0; static inline int fb_init(void) { int dev_fp = -1; int fb_size; struct fb_var_screeninfo vinfo; dev_fp = open("/dev/fb0", O_RDWR); if (dev_fp < 0) { perror("/dev/fb0"); return -1; } if (ioctl(dev_fp, FBIOGET_VSCREENINFO, &vinfo)) { printf("Error reading variable information. "); exit(1); } width=vinfo.xres; height=vinfo.yres; fb_bpp=vinfo.bits_per_pixel; //if(fb_bpp==24) fb_bpp=32; fb_size=width*height*fb_bpp/8; if ((fb_addr = (char*)mmap(0, fb_size, PROT_READ | PROT_WRITE, MAP_SHARED, dev_fp, 0)) < 0) { perror("mmap()"); return -1; } printf("%dx%d bpp:%d mmaped 0x%08x ",width,height,fb_bpp,fb_addr); return dev_fp; } void writeImageToFile(unsigned int size) { sprintf(filename,"/mnt/sd/0%d.bmp",capframe); bmpFile=fopen(filename, "w+"); if(fb_bpp == 16) fwrite(bmp_head_t,1,66,bmpFile); else { fwrite(&FileHead,1,14,bmpFile); fwrite(&InfoHead,1,40,bmpFile); } //fwrite(fb_addr,1,size,bmpFile); int h = 0; for (h = height-1; h > 0; h--) { fwrite(fb_addr + h * width*fb_bpp/8, 1, width*fb_bpp/8, bmpFile); } fclose(bmpFile); printf("%s ", filename); } int main(int argc, char *argv[]) { unsigned int i = 10; unsigned long size = 0; fb_fp = fb_init(); size=width*height*fb_bpp/8; if (argc < 2) { printf("run like 'prntscr num', num is bmpname' "); return 0; } capframe = atoi(argv[1]); if(fb_bpp==16){ *((unsigned int*)(bmp_head_t+18)) = width; *((unsigned int*)(bmp_head_t+22)) = height; *((unsigned short*)(bmp_head+28)) = 16; }else{ FileHead.cfType[0] = 'B'; FileHead.cfType[1] = 'M'; unsigned int tmp = width*height*fb_bpp/8;+54; FileHead.cfSize = tmp; FileHead.cfoffBits = 54; InfoHead.ciSize = 40; InfoHead.ciWidth = width; InfoHead.ciHeight = height; InfoHead.ciBitCount = 32; InfoHead.ciCompress = 0; InfoHead.ciSizeImage = size; } //while(i--) { writeImageToFile(size); } return 0; }

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