FBIOPUT_ALPHA_HIFB

Product	Supported
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	☓

Sets the alpha information of an overlaid layer.

int ioctl (int fd,  FBIOPUT_ALPHA_HIFB,  hi_fb_alpha *alpha)

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 FB device corresponding to the current VO device is returned.
FBIOPUT_ALPHA_HIFB	Input	ioctl number.
alpha	Output	Pointer to the alpha attribute.

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 FB device corresponding to the current VO device is returned.

FBIOPUT_ALPHA_HIFB

Input

ioctl number.

alpha

Output

Pointer to the alpha attribute.

Before using the HiFB API, you need to call hi_mpi_vo_enable to enable the VO device.

Parent topic: HiFB for Managing Overlaid Graphics Layers