fb_var_screeninfo 说明 定义HIFB的可变屏幕信息,此为Linux FrameBuffer原生结构体。 定义 struct fb_var_screeninfo { __u32 xres; /* visible resolution */ __u32 yres; __u32 xres_virtual; /* virtual resolution */ __u32 yres_virt
fb_var_screeninfo解析 structfb_var_screeninfo{ __u32xres;/* visible resolution */ __u32yres; __u32xres_virtual;/* virtual resolution */ __u32yres_virtual; __u32xoffset;/* offset from virtual to visible */ __u32yoffset;/* resolution */ __u32bits_per_pixel;/* guess what */ ...
fb_fix_screeninfo 的 line_length 成员,含义是一行的 size,以字节数表示,就是屏幕的宽度。fb_var_screeninfo定义了视频硬件一些可变的特性。这些特性在程序运行期间可以由应用程序动态改变。由于篇幅有限在此只对这个结构体中主要的成员作出解释,详细解释请参见fb.h。成员变量xres和yres定义在显示屏上真实显示的...
struct fb_var_screeninfo {__u32 xres; /* visible resolution */__u32 yres;__u32 xres_virtual; /* virtual resolution */__u32 yres_virtual;__u32 xoffset; /* offset from virtual to visible */__u32 yoffset; /* resolution */__u32 bits_per_pixel; /* guess what */__u32 grays...
fb_var_screeninfo 解析 struct fb_var_screeninfo { __u32 xres; /* visible resolution */ __u32 yres; __u32 xres_virtual; /* virtual resolution */ __u32 yres_virtual; __u32 xoffset; /* offset from virtual to visible */ __u32 yoffset; /* resolution */ __u32 bits_per_pixel...
内容提示: fb_var_screeninfo 解析 struct fb_var_screeninfo { __u32 xres; /* visible resolution */ __u32 yres; __u32 xres_virtual; /* virtual resolution */ __u32 yres_virtual; __u32 xoffset; /* offset from virtual to visible */ __u32 yoffset; /* resolution */ __u32 bits...
I'm trying to make an application for linux that writes directly to the framebuffer /dev/fb0. In order to make it double buffered I try to make the virtual screen be double the size of the screen. This is the program I wrote: struct fb_var_screeninfo screeninfo_var; struct fb...
fbvarscreeninfo解析 系统标签: structfbbitfieldscreeninfo解析yresxres fb_var_screeninfo解析structfb_var_screeninfo{__u32xres;/*visibleresolution*/__u32yres;__u32xres_virtual;/*virtualresolution*/__u32yres_virtu...
struct fb_fix_screeninfo和struct fb_var_screeninfo都定义在系统的/usr/include/linux/fb.h文件内。下面分别结构体定义、结构体字段说明两部分来详细解释这两个结构体。 二、struct fb_fix_screeninfo详解 struct fb_fix_screeninfo主要用于获取FrameBuffer的固定信息,这些信息无法在应用层被更改,只能通过ioctl函数使用...
structfb_var_screeninfovar; /*可变参数*/ structfb_fix_screeninfofix; /*固定参数*/ structfb_ops*fbops; //帧缓冲操作 编写帧缓冲驱动的主要工作就是编写fb_ops各个成员函数 编写具体驱动方法步骤: 1、构建具体驱动的fb_fix_screeninfo; 2、构建具体驱动的fb_info; 3、构建具体驱动的structfb_ops,并定义...