如何直接写入linux framebuffer？

Question

如何直接写入linux framebuffer？

Answer 1

看看FBIOPUT_VSCREENINFO,ioctl和mmap

(我有代码,但没有在这台电脑,对不起)

编辑:这应该让你开始

  //open file descriptor and get info
inf fdScreen = open( "devicename", O_RDWR );
fb_var_screeninfo varInfo;
ioctl( fdScreen, FBIOGET_VSCREENINFO, &varInfo );

  //set resolution/dpi/color depth/.. in varInfo, then write it back
ioctl( fdScreen, FBIOPUT_VSCREENINFO, &varInfo );

  //get writable screen memory; unsigned short here for 16bit color
unsigned short* display = mmap( 0, nScreenSize,
                                PROT_READ | PROT_WRITE, MAP_SHARED, fdScreen, 0 );

Answer 2

基本上你打开/ dev/fb0,对它做一些ioctls,然后mmap它.然后,您只需写入流程中的mmap'd区域即可.