Framebuffer重要结构体说明.docVIP

fb_var_screeninfo：记录了帧缓冲设备和指定显示模式的可修改记录。包括屏幕的分辨率，像素信息和一些时序变量 struct fb_var_screeninfo { __u32 xres; /* 行像素数 */ __u32 yres; /* 列像素数 */ __u32 xres_virtual; /* virtual resolution */ __u32 yres_virtual; __u32 xoffset; /* offset from virtual to visible */ __u32 yoffset; /* resolution */ __u32 bits_per_pixel; /*每个像素的位数 */ __u32 grayscale; /* != 0 Graylevels instead of colors */ struct fb_bitfield red; /* bitfield in fb mem if true color, */ struct fb_bitfield green;/* else only length is significant */ struct fb_bitfield blue; struct fb_bitfield transp;/* transparency */ __u32 nonstd; /* != 0 Non standard pixel format */ __u32 activate; /* see FB_ACTIVATE_* */ __u32 height; /* height of picture in mm */ __u32 width; /* width of picture in mm */ __u32 accel_flags; /* acceleration flags (hints) */ /* Timing: All values in pixclocks, except pixclock (of course) */ __u32 pixclock; /* pixel clock in ps (pico seconds) */ __u32 left_margin; /* time from sync to picture */ __u32 right_margin; /* time from picture to sync */ __u32 upper_margin; /* time from sync to picture */ __u32 lower_margin; __u32 hsync_len; /* length of horizontal sync */ __u32 vsync_len; /* length of vertical sync */ __u32 sync; /* see FB_SYNC_* */ __u32 vmode; /* see FB_VMODE_* */ __u32 reserved[6]; /* Reserved for future compatibility */ }; 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?grayscale;????????/*?!=?0?Graylevels?instead?of?colors?*/?? ?? ????struct?fb_bitfield?red;?????/*?bitfield?in?fb?mem?if?true?color,?*/?? ????struct?fb_bitfield?green;???/*?else?only?length?is?significant?*/?? ?