FBIOPAN_DISPLAY
Applicability
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Product |
Supported |
|---|---|
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☓ |
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☓ |
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√ |
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☓ |
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☓ |
Description
The display starts from different offsets of the virtual resolution. The actual resolution remains unchanged. As shown in the following figure, (xres_virtual, yres_virtual) indicates the virtual resolution, (xres, yres) indicates the actual display resolution, and (xoffset, yoffset) indicates the display offset.
Prototype
int ioctl (int fd, FBIOPAN_DISPLAY, fb_var_screeninfo *var)
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. |
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FBIOPAN_DISPLAY |
Input |
ioctl number. |
|
var |
Input |
Pointer to the variable information structure. |
Returns
- 0: success
- Other values: failure
Restrictions
- Before using the HiFB API, you need to call hi_mpi_vo_enable to enable the VO device.
- Ensure that the sum of the actual resolution and offset is within the range of the virtual resolution. Otherwise, the setting fails.
- This API does not support multiple processes or multiple threads.