XF86VIDMODE(3X11)

NAME
XF86VidModeQueryExtension, XF86VidModeQueryVersion, XF86VidModeGetModeLine, XF86VidModeGetAllModeLines, XF86VidModeDeleteModeLine, XF86VidModeModModeLine, XF86VidModeValidateModeLine, XF86VidModeSwitchMode, XF86VidModeSwitchToMode, XF86VidModeLockModeSwitch, XF86VidModeGetMonitor, XF86VidModeGetViewPort, XF86VidModeSetViewPort - XFree86-VidMode extension interface functions

SYNTAX

#include <X11/extensions/xf86vmode.h>

Bool XF86VidModeQueryExtension(
    Display *display,
    int *event_base_return,
    int *error_base_return);

Bool XF86VidModeQueryVersion(
    Display *display,
    int *major_version_return,
    int *minor_version_return);

Bool XF86VidModeGetModeLine(
    Display *display,
    int screen,
    int *dotclock_return,
    XF86VidModeModeLine *modeline);

Bool XF86VidModeGetAllModeLines(
    Display *display,
    int screen,
    int *modecount_return,
    XF86VidModeModeInfo **modesinfo);

Bool XF86VidModeDeleteModeLine(
    Display *display,
    int screen,
    XF86VidModeModeInfo *modeline);

Bool XF86VidModeModModeLine(
    Display *display,
    int screen,
    XF86VidModeModeLine *modeline);

Status XF86VidModeValidateModeLine(
    Display *display,
    int screen,
    XF86VidModeModeLine *modeline);

Bool XF86VidModeSwitchMode(
    Display *display,
    int screen,
    int zoom);

Bool XF86VidModeSwitchToMode(
    Display *display,
    int screen,
    XF86VidModeModeInfo *modeline);

Bool XF86VidModeLockModeSwitch(
    Display *display,
    int screen,
    int lock);

Bool XF86VidModeGetMonitor(
    Display *display,
    int screen,
    XF86VidModeMonitor *monitor);

Bool XF86VidModeGetViewPort(
    Display *display,
    int screen,
    int *x_return,
    int *y_return);

Bool XF86VidModeSetViewPort(
    Display *display,
    int screen,
    int x,
    int y);

ARGUMENTS

display
    Specifies the connection to the X server.

screen
    Specifies which screen number the setting apply to.

event_base_return
    Returns the base event number for the extension.

error_base_return
    Returns the base error number for the extension.

major_version_return
    Returns the major version number of the extension.

minor_version_return
    Returns the minor version number of the extension.

dotclock_return
    Returns the clock for the mode line.

modecount_return
    Returns the number of video modes available in the server.

zoom
    If greater than zero, indicates that the server should switch to the next mode, otherwise switch to the previous mode.

lock
    Indicates that mode switching should be locked, if non-zero.

modeline
    Specifies or returns the timing values for a video mode.

modesinfo
    Returns the timing values and dotclocks for all of the available video modes.

monitor
    Returns information about the monitor.

x   Specifies the desired X location for the viewport.

x_return
    Returns the current X location of the viewport.

y   Specifies the desired Y location for the viewport.

y_return
    Returns the current Y location of the viewport.

STRUCTURES
Video Mode Settings:
typedef struct {
    unsigned short	hdisplay;
    unsigned short	hsyncstart;
    unsigned short	hsyncend;
    unsigned short	htotal;
    unsigned short	vdisplay;
    unsigned short	vsyncstart;
    unsigned short	vsyncend;
    unsigned short	vtotal;
    unsigned int	flags;
    int	privsize;
    INT32	*private;
} XF86VidModeModeLine;

typedef struct {
    unsigned int	dotclock;
    unsigned short	hdisplay;
    unsigned short	hsyncstart;
    unsigned short	hsyncend;
    unsigned short	htotal;
    unsigned short	vdisplay;
    unsigned short	vsyncstart;
    unsigned short	vsyncend;
    unsigned short	vtotal;
    unsigned int	flags;
    int	privsize;
    INT32	*private;
} XF86VidModeModeInfo;

Monitor information:
typedef struct {
    char*	vendor;
    char*	model;
    float	bandwidth;
    unsigned char	nhsync;
    XF86VidModeSyncRange*	hsync;
    unsigned char	nvsync;
    XF86VidModeSyncRange*	vsync;
} XF86VidModeMonitor;

typedef struct {
    float	hi;
    float	lo;
} XF86VidModeSyncRange;

DESCRIPTION
These functions provide an interface to the server extension XFree86-VidModeExtension which allows the video modes to be queried and adjusted dynamically and mode switching to be controlled. Applications that use these functions must be linked with

  MODELINE FUNCTIONS
The function is used to query the settings for the currently selected video mode. The calling program should pass a pointer to a structure that it has already allocated. The function fills in the fields of the structure.

If there are any server private values (currently only applicable to the S3 server) the function will allocate storage for them. Therefore, if the field is non-zero, the calling program should call to free the storage.

returns the settings for all video modes. The calling program supplies the address of a pointer which will be set by the function to point to an array of structures. The memory occupied by the array is dynamically allocated by the function and should be freed by the caller. The first element of the array corresponds to the current video mode.

The function can be used to change the settings of the current video mode provided the requested settings are valid (e.g. they don't exceed the capabilities of the monitor).

Modes can be deleted with the function. The specified mode must match an existing mode. To be considered a match, all of the fields of the given structure must match, except the and fields. If the mode to be deleted is the current mode, a mode switch to the next mode will occur first. The last remaining mode can not be deleted.

The validity of a mode can be checked with the function. If the specified mode can be used by the server (i.e. meets all the constraints placed upon a mode by the combination of the server, card, and monitor) the function returns otherwise it returns a value indicating the reason why the mode is invalid (as defined in xf86.h)

  MODE SWITCH FUNCTIONS
When the function is called, the server will change the video mode to next (or previous) video mode. The function can be used to switch directly to the specified mode. Matching is as specified in the description of the function above. The function can be used to allow or disallow mode switching whether the request to switch modes comes from a call to the or functions or from one of the mode switch key sequences.

  MONITOR FUNCTIONS
Information known to the server about the monitor is returned by the function. The and fields each point to an array of structures. The arrays contain and elements, respectively. The and values will be equal if a discreate value was given in the file.

The and fields point to dynamically allocated storage that should be freed by the caller.

  VIEWPORT FUNCTIONS
The and functions can be used to, respectively, query and change the location of the upper left corner of the viewport into the virtual screen.

  OTHER FUNCTIONS
The function can be used to determine the version of the extension built into the server.

The function returns the lowest numbered error and event values assigned to the extension.

SEE ALSO
XFree86(1), XF86Config(4/5), xvidtune(1)

AUTHORS
Kaleb Keithley, Jon Tombs, David Dawes, and Joe Moss