数码相册项目的实现
本人因为此阶段精力有限，没有时间去整理代码格式，还请见谅。
//功能；自动左右切换，每一秒切换一次；（自动切换）
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
int fd;
int *plcd=NULL;
void LCD_Draw_Point(int x,int y,int color)
{
if(x >=0 && x < 800 && y >=0 && y < 480)
{
*(plcd + 800*y + x) = color;
}
}
void bmp_display(char *pathname)
{
int fdBmp;
int w,h;
unsigned char buf[4];
int color_depth;
//打开对应的文件
fdBmp = open(pathname,O_RDONLY);
if(fdBmp<0)
{
perror("bmp open fail");
return;
}
//判断是不是BMP图片
read(fdBmp,buf,2);
if(buf[0] != 0x42 || buf[1] != 0x4d)
{
printf("This is not a BMP picture\n");
return;
}
//读图片的宽度
lseek(fdBmp,0x12,SEEK_SET);
read(fdBmp,buf,4);
w = buf[3] << 24 | buf[2] << 16 | buf[1] << 8 | buf[0];
//读图片的高度
lseek(fdBmp,0x16,SEEK_SET);
read(fdBmp,buf,4);
h = buf[3] << 24 | buf[2] << 16 | buf[1] << 8 | buf[0];
printf("w=%d h=%d\n",w,h);
//读图片的色深
lseek(fdBmp,0x1c,SEEK_SET);
read(fdBmp,buf,2);
color_depth = buf[1] << 8 | buf[0];
//计算图片数据的大小
int size = abs(w*h*color_depth/8) ;
//分配用来保存图片数据的内存空间
unsigned char *pixel = malloc(size);
lseek(fdBmp,54,SEEK_SET);
read(fdBmp,pixel,size);
int x,y;
int i=0;
unsigned char a,r,g,b;
int color;
for(y=0;y < abs(h); y++)
{
for(x=0;x b = pixel[i++]; g = pixel[i++]; r = pixel[i++]; a = (color_depth == 32) ? pixel[i++] : 0; color = a << 24 | r << 16 | g << 8 | b; //组合成一个新的颜色值ARGB int dy = h > 0 ? (h - 1 - y) : y; //判断图片是从左下角还是左上角开始显示 LCD_Draw_Point(x,dy,color); } } free(pixel); close(fdBmp); } void jpeg_display(char *pathname) { //1）、分配并且初始化一个jpeg的解压对象 struct jpeg_decompress_struct cinfo; //jpeg解压对象 struct jpeg_error_mgr jerr; //jpeg解压出错处理的结构体 cinfo.err = jpeg_std_error(&jerr); //初始化这两个对象 jpeg_create_decompress(&cinfo); //2）、将需要解压的JPEG图片读进来 FILE * infile; if ((infile = fopen(pathname, "r")) == NULL) { fprintf(stderr, "can't open \n"); exit(1); } jpeg_stdio_src(&cinfo, infile); //3）、读取JPEG的头信息 jpeg_read_header(&cinfo, TRUE); //4）、设置解压的参数，如果不需要修改，就不需要做什么，采用默认的解压参数就可以了。 //5）、调用对应的函数，进行解压操作 //printf("cinfo.output_components=%d cinfo.output_height=%d\n",cinfo.output_components,cinfo.output_height); jpeg_start_decompress(&cinfo); printf(" cinfo.output_height=%d\n",cinfo.output_height); printf("components=%d width=%d\n",cinfo.output_components,cinfo.output_width); unsigned char *buffer = malloc(cinfo.output_width * cinfo.output_components); //6）、逐行读入JPEG的数据，并且解压 int x,y=0; while ( cinfo.output_scanline < cinfo.output_height ) { y=cinfo.output_scanline; jpeg_read_scanlines(&cinfo, &buffer, 1); unsigned char a,r,g,b; int color; unsigned char *p = buffer; for(x=0;x < cinfo.output_width;x++) { if(cinfo.output_components == 3) { a=0; //如果cinfo.output_components == 3 它只有RGB的值 } else { a=*p++; //否则是ARGB的格式 } r = *p++; g = *p++; b = *p++; color = a << 24 | r << 16 | g << 8 | b; if(y<480 && x < 800) { LCD_Draw_Point( x, y, color); } } } //7）、调用函数完成解压操作 jpeg_finish_decompress(&cinfo); //8）、释放JPEG解压对象 jpeg_destroy_decompress(&cinfo); fclose(infile); } struct picnode { char name[32]; struct picnode *pre; struct picnode *next; int mode; }; struct pichead { struct picnode *next; struct picnode *pre; }; struct pichead *creathead() { struct pichead *dhead=(struct pichead *)malloc(sizeof(*dhead)); dhead->next=NULL; dhead->pre=NULL; return dhead; } void addnode(struct pichead *head,struct picnode *p) { if(head==NULL||p==NULL) { return; } if(head->next==NULL) { head->next=p; head->pre=p; } else { head->pre->next=p; p->pre=head->pre; head->pre=p; } } void printklink(struct pichead *head)//打印链表，调用jpeg图片显示 { struct picnode *p=head->next; while(p) { printf("%s %d\n",p->name,p->mode); if(p->mode==1) { jpeg_display(p->name); } else if(p->mode==0) { bmp_display(p->name); } sleep(1); p=p->next; } printf("********\n"); p=head->pre; while(p) { printf("%s %d\n",p->name,p->mode); if(p->mode==1) { jpeg_display(p->name); } else if(p->mode==0) { bmp_display(p->name); } sleep(1); p=p->pre; } } struct pichead * dirsize(char *pathname,struct pichead *head)//把图片路径放入链表； { DIR *dir; dir=opendir(pathname); struct stat st; char filename[520]; int size=0; if(dir==NULL) { perror("open dir fail"); } struct dirent *dirp=NULL; while(dirp=readdir(dir)) { if(strcmp(dirp->d_name,".")==0||strcmp(dirp->d_name,"..")==0)//过滤掉当前目录和上一级目录 { continue; } sprintf(filename,"%s/%s",pathname,dirp->d_name); if(strcmp(filename+strlen(filename)-4,".jpg")==0) { // printf("==> %s\n",filename); struct picnode *p=(struct picnode *)malloc(sizeof(*p)); strcpy(p->name,filename); p->mode=1; p->next=NULL; p->pre=NULL; addnode(head,p); } if(strcmp(filename+strlen(filename)-4,".bmp")==0) { // printf("==> %s\n",filename); struct picnode *p=(struct picnode *)malloc(sizeof(*p)); strcpy(p->name,filename); p->mode=0; p->next=NULL; p->pre=NULL; addnode(head,p); } stat(filename,&st); if(S_ISDIR(st.st_mode)) { dirsize(filename,head); } else { size+=st.st_size;//可以不要，用来计算文件总大小的； } } closedir(dir); return head; } int main(int argc,char *argv[]) { fd = open("/dev/fb0",O_RDWR); if(fd < 0) { perror("open lcd fail"); return -1; } struct fb_var_screeninfo fbinfo; ioctl(fd,FBIOGET_VSCREENINFO,&fbinfo); printf("x:%d y:%d bit_per_pixel:%d\n",fbinfo.xres,fbinfo.yres,fbinfo.bits_per_pixel); plcd = mmap( NULL ,//表示映射的地址，为空让系统自动分配 fbinfo.xres*fbinfo.yres*fbinfo.bits_per_pixel/8,//分配内存的大小 PROT_WRITE,//对这个内存区域访问的权限 MAP_SHARED,//其他进程访问的权限 fd, 0//偏移量 ); if(plcd == MAP_FAILED) { perror("mmap fail"); close(fd); return -1; } int x,y; struct pichead *head=creathead();//创建单链表； head=dirsize(argv[1],head);//把图片文件名加到链表里面去； printklink(head);//打印图片； munmap(plcd,fbinfo.xres*fbinfo.yres*fbinfo.bits_per_pixel/8);//解映射； close(fd); return 0; } //功能；能实现通过左右滑动实现图片切换； #include #include #include #include #include #include #include #include #include #include #include #include #include #include int fd; int *plcd=NULL; void bmp_display(char *pathname); void jpeg_display(char *pathname); struct picnode//定义结点结构体 { char name[32]; struct picnode *pre; struct picnode *next; int mode; }; struct pichead//定义头节点结构体，里面没有内容 { struct picnode *next; struct picnode *pre; }; struct pichead *creathead()//创建头节点 { struct pichead *dhead=(struct pichead *)malloc(sizeof(*dhead)); dhead->next=NULL; dhead->pre=NULL; return dhead; } void addnode(struct pichead *head,struct picnode *p)//将结点一个一个加入到链表里面，注意头 //节点的pre和最后一个结点的next为NULL; { if(head==NULL||p==NULL) { return; } if(head->next==NULL) { head->next=p; head->pre=p; } else { head->pre->next=p; p->pre=head->pre; head->pre=p; } } struct picnode *printklink(struct picnode *p,int ff) { if(ff==1)//ff为1时，显示左滑的照片； { p=p->pre; printf("%s %d\n",p->name,p->mode); if(p->mode==1) { jpeg_display(p->name); } else if(p->mode==0) { bmp_display(p->name); } } else if(ff==0)//为0时显示向右的照片； { p=p->next; printf("%s %d\n",p->name,p->mode); if(p->mode==1) { jpeg_display(p->name); } else if(p->mode==0) { bmp_display(p->name); } } return p; } struct pichead * dirsize(char *pathname,struct pichead *head)//把图片路径都搜索出来 //放入链表的name里面 { DIR *dir; dir=opendir(pathname); struct stat st; char filename[520]; int size=0; if(dir==NULL) { perror("open dir fail"); } struct dirent *dirp=NULL; while(dirp=readdir(dir))//while循环不断读取目录里面的内容； { if(strcmp(dirp->d_name,".")==0||strcmp(dirp->d_name,"..")==0) { continue; } sprintf(filename,"%s/%s",pathname,dirp->d_name); if(strcmp(filename+strlen(filename)-4,".jpg")==0)//筛选.jpg格式照片； { struct picnode *p=(struct picnode *)malloc(sizeof(*p)); strcpy(p->name,filename); p->mode=1; p->next=NULL; p->pre=NULL; addnode(head,p); } if(strcmp(filename+strlen(filename)-4,".bmp")==0)//筛选.bmp格式照片； { struct picnode *p=(struct picnode *)malloc(sizeof(*p)); strcpy(p->name,filename); p->mode=0; p->next=NULL; p->pre=NULL; addnode(head,p); } stat(filename,&st); if(S_ISDIR(st.st_mode))//如果是目录，继续调用函数遍历； { dirsize(filename,head); } } closedir(dir); return head; } void LCD_Draw_Point(int x,int y,int color)//画点函数 { if(x >=0 && x < 800 && y >=0 && y < 480) { *(plcd + 800*y + x) = color; } } void bmp_display(char *pathname)//bmp格式图片显示 { int fdBmp; int w,h; unsigned char buf[4]; int color_depth; //打开对应的文件 fdBmp = open(pathname,O_RDONLY); if(fdBmp<0) { perror("bmp open fail"); return; } //判断是不是BMP图片 read(fdBmp,buf,2); if(buf[0] != 0x42 || buf[1] != 0x4d) { printf("This is not a BMP picture\n"); return; } //读图片的宽度 lseek(fdBmp,0x12,SEEK_SET); read(fdBmp,buf,4); w = buf[3] << 24 | buf[2] << 16 | buf[1] << 8 | buf[0]; //读图片的高度 lseek(fdBmp,0x16,SEEK_SET); read(fdBmp,buf,4); h = buf[3] << 24 | buf[2] << 16 | buf[1] << 8 | buf[0]; printf("w=%d h=%d\n",w,h); //读图片的色深 lseek(fdBmp,0x1c,SEEK_SET); read(fdBmp,buf,2); color_depth = buf[1] << 8 | buf[0]; //计算图片数据的大小 int size = abs(w*h*color_depth/8) ; //分配用来保存图片数据的内存空间 unsigned char *pixel = malloc(size); lseek(fdBmp,54,SEEK_SET); read(fdBmp,pixel,size); int x,y; int i=0; unsigned char a,r,g,b; int color; for(y=0;y < abs(h); y++) { for(x=0;x b = pixel[i++]; g = pixel[i++]; r = pixel[i++]; a = (color_depth == 32) ? pixel[i++] : 0; color = a << 24 | r << 16 | g << 8 | b; //组合成一个新的颜色值ARGB int dy = h > 0 ? (h - 1 - y) : y; //判断图片是从左下角还是左上角开始显示 LCD_Draw_Point(x,dy,color); } } free(pixel); close(fdBmp); } void jpeg_display(char *pathname)//jpeg图片显示函数 { //1）、分配并且初始化一个jpeg的解压对象 struct jpeg_decompress_struct cinfo; //jpeg解压对象 struct jpeg_error_mgr jerr; //jpeg解压出错处理的结构体 cinfo.err = jpeg_std_error(&jerr); //初始化这两个对象 jpeg_create_decompress(&cinfo); //2）、将需要解压的JPEG图片读进来 FILE * infile; if ((infile = fopen(pathname, "r")) == NULL) { fprintf(stderr, "can't open \n"); exit(1); } jpeg_stdio_src(&cinfo, infile); //3）、读取JPEG的头信息 jpeg_read_header(&cinfo, TRUE); //4）、设置解压的参数，如果不需要修改，就不需要做什么，采用默认的解压参数就可以了。 //5）、调用对应的函数，进行解压操作 //printf("cinfo.output_components=%d cinfo.output_height=%d\n",cinfo.output_components,cinfo.output_height); jpeg_start_decompress(&cinfo); printf(" cinfo.output_height=%d\n",cinfo.output_height); printf("components=%d width=%d\n",cinfo.output_components,cinfo.output_width); unsigned char *buffer = malloc(cinfo.output_width * cinfo.output_components); //6）、逐行读入JPEG的数据，并且解压 int x,y=0; while ( cinfo.output_scanline < cinfo.output_height ) { y=cinfo.output_scanline; jpeg_read_scanlines(&cinfo, &buffer, 1); unsigned char a,r,g,b; int color; unsigned char *p = buffer; for(x=0;x < cinfo.output_width;x++) { if(cinfo.output_components == 3) { a=0; //如果cinfo.output_components == 3 它只有RGB的值 } else { a=*p++; //否则是ARGB的格式 } r = *p++; g = *p++; b = *p++; color = a << 24 | r << 16 | g << 8 | b; if(y<480 && x < 800) { LCD_Draw_Point( x, y, color); } } } //7）、调用函数完成解压操作 jpeg_finish_decompress(&cinfo); //8）、释放JPEG解压对象 jpeg_destroy_decompress(&cinfo); fclose(infile); } int main(int argc,char *argv[]) { fd = open("/dev/fb0",O_RDWR);//打开framebuffer，相当于显存； if(fd < 0) { perror("open lcd fail"); return -1; } struct fb_var_screeninfo fbinfo; ioctl(fd,FBIOGET_VSCREENINFO,&fbinfo); printf("x:%d y:%d bit_per_pixel:%d\n",fbinfo.xres,fbinfo.yres,fbinfo.bits_per_pixel); plcd = mmap( NULL ,//表示映射的地址，为空让系统自动分配 fbinfo.xres*fbinfo.yres*fbinfo.bits_per_pixel/8,//分配内存的大小 PROT_WRITE,//对这个内存区域访问的权限 MAP_SHARED,//其他进程访问的权限 fd, 0//偏移量 ); if(plcd == MAP_FAILED) { perror("mmap fail"); close(fd); return -1; } int x,y; for(y=0;y<480;y++) { for(x=0;x<800;x++) { *(plcd + x + y*800) = 0x000000FF;//显示蓝色屏幕； } } struct pichead * head=creathead(); head=dirsize(argv[1],head); struct picnode *p=head->next; if(p->mode==1) { jpeg_display(p->name); } else if(p->mode==0) { bmp_display(p->name); }//创建头结点，并显示头节点下一节点的图片，因为头节点没内荣； int fdts; struct input_event ts;//事件结构体； fdts = open("/dev/input/event0",O_RDONLY); if(fdts < 0) { perror("ts open fail"); return -1; } while(1) { int m1=0,m2=0,flag=0; while(1) { read(fdts,&ts,sizeof(struct input_event)); if(ts.type == EV_KEY && ts.code == 0x14a )//按键事件，只有在按下时值为1，滑动过程没值，值为触摸屏事件； { if(ts.value==1)//按下 { flag=1;//标志位； } else if(ts.value==0)//松开 { if(m1>m2) { if(p->pre==NULL) { p=head->pre; }//因为头节点pre为空 p=printklink(p,1); break;//左滑； } else if(m1 { if(p->next==NULL) { p=head->next; }//最后一个节点的next为NULL; p=printklink(p,0); break;//右滑； } } } else if(ts.type == EV_ABS&&ts.code == ABS_X)//采集两点的x坐标； { if (flag==1) { m1=ts.value; flag=2; } else if(flag==2) { m2=ts.value; } } } } mummap(plcd,fbinfo.xres*fbinfo.yres*fbinfo.bits_per_pixel/8);//解映射； close(fdts); close(fd); return 0; } //功能：实现左右点切换图片 #include #include #include #include #include #include #include #include int fd; int *plcd=NULL; void LCD_Draw_Point(int x,int y,int color) { if(x >=0 && x < 800 && y >=0 && y < 480) { *(plcd + 800*y + x) = color; } } void jpeg_display(char *pathname) { //1）、分配并且初始化一个jpeg的解压对象 struct jpeg_decompress_struct cinfo; //jpeg解压对象 struct jpeg_error_mgr jerr; //jpeg解压出错处理的结构体 cinfo.err = jpeg_std_error(&jerr); //初始化这两个对象 jpeg_create_decompress(&cinfo); //2）、将需要解压的JPEG图片读进来 FILE * infile; if ((infile = fopen(pathname, "r")) == NULL) { fprintf(stderr, "can't open \n"); exit(1); } jpeg_stdio_src(&cinfo, infile); //3）、读取JPEG的头信息 jpeg_read_header(&cinfo, TRUE); //4）、设置解压的参数，如果不需要修改，就不需要做什么，采用默认的解压参数就可以了。 //5）、调用对应的函数，进行解压操作 //printf("cinfo.output_components=%d cinfo.output_height=%d\n",cinfo.output_components,cinfo.output_height); jpeg_start_decompress(&cinfo); printf(" cinfo.output_height=%d\n",cinfo.output_height); printf("components=%d width=%d\n",cinfo.output_components,cinfo.output_width); unsigned char *buffer = malloc(cinfo.output_width * cinfo.output_components); //6）、逐行读入JPEG的数据，并且解压 int x,y=0; while ( cinfo.output_scanline < cinfo.output_height ) { y=cinfo.output_scanline; jpeg_read_scanlines(&cinfo, &buffer, 1); unsigned char a,r,g,b; int color; unsigned char *p = buffer; for(x=0;x < cinfo.output_width;x++) { if(cinfo.output_components == 3) { a=0; //如果cinfo.output_components == 3 它只有RGB的值 } else { a=*p++; //否则是ARGB的格式 } r = *p++; g = *p++; b = *p++; color = a << 24 | r << 16 | g << 8 | b; if(y<480 && x < 800) { LCD_Draw_Point( x, y, color); } } } //7）、调用函数完成解压操作 jpeg_finish_decompress(&cinfo); //8）、释放JPEG解压对象 jpeg_destroy_decompress(&cinfo); fclose(infile); } int main() { fd = open("/dev/fb0",O_RDWR); if(fd < 0) { perror("open lcd fail"); return -1; } struct fb_var_screeninfo fbinfo; ioctl(fd,FBIOGET_VSCREENINFO,&fbinfo); printf("x:%d y:%d bit_per_pixel:%d\n",fbinfo.xres,fbinfo.yres,fbinfo.bits_per_pixel); plcd = mmap( NULL ,//表示映射的地址，为空让系统自动分配 fbinfo.xres*fbinfo.yres*fbinfo.bits_per_pixel/8,//分配内存的大小 PROT_WRITE,//对这个内存区域访问的权限 MAP_SHARED,//其他进程访问的权限 fd, 0//偏移量 ); if(plcd == MAP_FAILED) { perror("mmap fail"); close(fd); return -1; } int x,y; for(y=0;y<480;y++) { for(x=0;x<800;x++) { *(plcd + x + y*800) = 0x000000FF; } } int fdts; struct input_event ts; fdts = open("/dev/input/event0",O_RDONLY); if(fdts < 0) { perror("ts open fail"); return -1; } while(1) { read(fdts,&ts,sizeof(struct input_event)); if(ts.type == EV_ABS) { if(ts.code == ABS_X) { printf("x=%d\n",ts.value); if(ts.value<=400) { jpeg_display("caobo/1.jpg"); } else { jpeg_display("caobo/2.jpg"); } } else if(ts.code == ABS_Y) { printf("y=%d\n",ts.value); } } } close(fdts); return 0; }