FBIOGET_VSCREENINFO

Product	Supported
Ascend 950PR/Ascend 950DT	☓
Atlas A3 training products/Atlas A3 inference products	☓
Atlas A2 training products/Atlas A2 inference products	☓
Atlas 200I/500 A2 inference products	√
Atlas inference products	☓
Atlas training products	☓

Obtains the variable information about the Framebuffer screen, including the resolution and pixel format.

int ioctl (int fd, FBIOGET_VSCREENINFO, fb_var_screeninfo *var)

Parameter	Input/Output	Description
fd	Input	File descriptor of an FB device. When open("/dev/fbx") is called in the application, the file descriptor of the Framebuffer corresponding to the current VO device is returned.
FBIOGET_VSCREENINFO	Input	ioctl number.
var	Output	Pointer to the variable information structure.

Parameter

Input/Output

Description

Input

File descriptor of an FB device.

When open("/dev/fbx") is called in the application, the file descriptor of the Framebuffer corresponding to the current VO device is returned.

FBIOGET_VSCREENINFO

Input

ioctl number.

var

Output

Pointer to the variable information structure.

0: success
Other values: failure. The error code of the Linux kernel is returned. For details, click here.

The default resolution of the HD graphics layer is 1920 × 1080, the default resolution of the cursor layer is 256 × 256, the default resolution of the SD graphics layer is 720 × 576, and the default pixel format is ARGB8888.
Before using the HiFB API, you need to call hi_mpi_vo_enable to enable the VO device.
This API does not support multiple processes or multiple threads.

Parent topic: HiFB for Managing Overlaid Graphics Layers