Table of Contents

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 -lXxf86vm

Modeline Functions

The XF86VidModeGetModeLine function is used to query the settings for the currently selected video mode. The calling program should pass a pointer to a XF86VidModeModeLine 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 privsize field is non-zero, the calling program should call Xfree(private) to free the storage.

XF86VidModeGetAllModeLines 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 XF86VidModeModeInfo structures. The memory occupied by the array is dynamically allocated by the XF86VidModeGetAllModeLines function and should be freed by the caller. The first element of the array corresponds to the current video mode.

The XF86VidModeModModeLine 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 XF86VidModeDeleteModeLine function. The specified mode must match an existing mode. To be considered a match, all of the fields of the given XF86VidModeModeInfo structure must match, except the privsize and private 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 XF86VidModeValidateModeLine 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 MODE_OK, otherwise it returns a value indicating the reason why the mode is invalid (as defined in xf86.h)

Mode Switch Functions

When the function XF86VidModeSwitchMode is called, the server will change the video mode to next (or previous) video mode. The XF86VidModeSwitchToMode function can be used to switch directly to the specified mode. Matching is as specified in the description of the XF86VidModeAddModeLine function above. The XF86VidModeLockModeSwitch function can be used to allow or disallow mode switching whether the request to switch modes comes from a call to the XF86VidModeSwitchMode or XF86VidModeSwitchToMode functions or from one of the mode switch key sequences.

Monitor Functions

Information known to the server about the monitor is returned by the XF86VidModeGetMonitor function. The hsync and vsync fields each point to an array of XF86VidModeSyncRange structures. The arrays contain nhsync and nvsync elements, respectively. The hi and low values will be equal if a discreate value was given in the XF86Config file.

The vendor, model, hsync, and vsync fields point to dynamically allocated storage that should be freed by the caller.

Viewport Functions

The XF86VidModeGetViewPort and XF86VidModeSetViewPort 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 XF86VidModeQueryVersion function can be used to determine the version of the extension built into the server.

The function XF86VidModeQueryExtension 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

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