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FBIOGET_ALPHA_HIFB

The Atlas 200/300/500 Inference Product does not support this API.

The Atlas Training Series Product does not support this API.

Description

Obtains the alpha information of an overlaid layer.

Restrictions

  • 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.

Prototype

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

Parameters

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.

FBIOGET_ALPHA_HIFB

Input

ioctl number.

alpha

Output

Pointer to the alpha attribute.

Returns

  • 0: success
  • Other values: failure