Nvidia Quadro FX 4800

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NVIDIA Corporation

72 Quadro FX 4800/5800 and Quadro CX SDI User’s Guide– Version 1.0

HAPTER 5

API Control

);

ThisfunctionisthesameasXNVCTRLSetAttribute(),andreturnsTrueiftheoperation

succeeds,otherwiseFalse.

XNVCTRLQueryAttribute()

Bool XNVCTRLQueryAttribute (

Display *dpy,

int screen,

unsigned int display_mask,

unsigned int attribute,

int *value

);

ThisfunctionreturnsTrueiftheattributeexists,otherwiseFalse.

IfXNVCTRLQueryAttributereturnsTrue,valuewillcontainthevalueofthespecified

attribute.Notallattributesrequirethedisplay_maskparameter.See“NV_CTRL_GVO

Attributes”onpage 75 fordetails.

Possibleerrors:

•BadValue‐Thescreendoesnʹtexist.

• BadMatch‐TheNVIDIAdriverisnotpresent

onthatscreen.

XNVCTRLQueryStringAttribute()

Bool XNVCTRLQueryStringAttribute (

Display *dpy,

int screen,

unsigned int display_mask,

unsigned int attribute,

char **ptr

);

ThisfunctionreturnsTrueiftheattributeexists,otherwiseFalse.

IfXNVCTRLQueryStringAttributereturnsTrue,*ptrwillpointtoanallocatedstring

containingthestringattributerequested.Itisthecallerʹsresponsibilitytofreethestring

whendone.

Possibleerrors:

Nvidia Quadro FX 4800 - Page 76