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XF86VIDMODE

Section: C Library Functions (3)
Updated: libXxf86vm 1.1.3
Index Return to Main Contents

NAME

XF86VidModeQueryExtension, XF86VidModeQueryVersion, XF86VidModeSetClientVersion, XF86VidModeGetModeLine, XF86VidModeGetAllModeLines, XF86VidModeDeleteModeLine, XF86VidModeModModeLine, XF86VidModeValidateModeLine, XF86VidModeSwitchMode, XF86VidModeSwitchToMode, XF86VidModeLockModeSwitch, XF86VidModeGetMonitor, XF86VidModeGetViewPort, XF86VidModeSetViewPort, XF86VidModeGetDotClocks, XF86VidModeGetGamma, XF86VidModeSetGamma, XF86VidModeGetGammaRamp, XF86VidModeSetGammaRamp, XF86VidModeGetGammaRampSize, XF86VidModeGetPermissions - Extension library for the XFree86-VidMode X extension

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 XF86VidModeSetClientVersion(
    Display *display);

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);

XF86VidModeGetDotClocks(
    Display *display,
    int screen,
    int *flags return,
    int *number of clocks return,
    int *max dot clock return,
    int **clocks return);

XF86VidModeGetGamma(
    Display *display,
    int screen,
    XF86VidModeGamma *Gamma);

XF86VidModeSetGamma(
    Display *display,
    int screen,
    XF86VidModeGamma *Gamma);

XF86VidModeGetGammaRamp(
    Display *display,
    int screen,
    int size,
    unsigned short *red array,
    unsigned short *green array,
    unsigned short *blue array);

XF86VidModeSetGammaRamp(
    Display *display,
    int screen,
    int size,
    unsigned short *red array,
    unsigned short *green array,
    unsigned short *blue array);

XF86VidModeGetGammaRampSize(
    Display *display,
    int screen,
    int *size);

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;   /* Number of display pixels horizontally */
    unsigned short     hsyncstart; /* Horizontal sync start */
    unsigned short     hsyncend;   /* Horizontal sync end */
    unsigned short     htotal;     /* Total horizontal pixels */
    unsigned short     vdisplay;   /* Number of display pixels vertically */
    unsigned short     vsyncstart; /* Vertical sync start */
    unsigned short     vsyncend;   /* Vertical sync start */
    unsigned short     vtotal;     /* Total vertical pixels */
    unsigned int       flags;      /* Mode flags */
    int                privsize;   /* Size of private */
    INT32              *private;   /* Server privates */
} XF86VidModeModeLine;

typedef struct {
    unsigned int       dotclock;   /* Pixel clock */
    unsigned short     hdisplay;   /* Number of display pixels horizontally */
    unsigned short     hsyncstart; /* Horizontal sync start */
    unsigned short     hsyncend;   /* Horizontal sync end */
    unsigned short     htotal;     /* Total horizontal pixels */
    unsigned short     vdisplay;   /* Number of display pixels vertically */
    unsigned short     vsyncstart; /* Vertical sync start */
    unsigned short     vsyncend;   /* Vertical sync start */
    unsigned short     vtotal;     /* Total vertical pixels */
    unsigned int       flags;      /* Mode flags */
    int                privsize;   /* Size of private */
    INT32              *private;   /* Server privates */
} XF86VidModeModeInfo;

Monitor information:
typedef struct {
    char*              vendor;     /* Name of manufacturer */
    char*              model;      /* Model name */
    float              EMPTY;      /* unused, for backward compatibility */
    unsigned char      nhsync;     /* Number of horiz sync ranges */
    XF86VidModeSyncRange*          hsync;/* Horizontal sync ranges */
    unsigned char      nvsync;     /* Number of vert sync ranges */
    XF86VidModeSyncRange*          vsync;/* Vertical sync ranges */
} XF86VidModeMonitor;

typedef struct {
    float              hi;         /* Top of range */
    float              lo;         /* Bottom of range */
} XF86VidModeSyncRange;

typedef struct {
    int type;                      /* of event */
    unsigned long serial;          /* # of last request processed by server */
    Bool send_event;               /* true if this came from a SendEvent req */
    Display *display;              /* Display the event was read from */
    Window root;                   /* root window of event screen */
    int state;                     /* What happened */
    int kind;                      /* What happened */
    Bool forced;                   /* extents of new region */
    Time time;                     /* event timestamp */
} XF86VidModeNotifyEvent;

typedef struct {
    float red;                     /* Red Gamma value */
    float green;                   /* Green Gamma value */
    float blue;                    /* Blue Gamma value */
} XF86VidModeGamma;

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.

Note: Because of the asynchronous nature of the X protocol, a call to XFlush is needed if the application wants to see the mode change immediately. To be informed of the execution status of the request, a custom error handler should be installed using XSetErrorHandler before calling the mode switching function.

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.

BUGS

The XF86VidModeSetClientVersion, XF86VidModeGetDotClocks, XF86VidModeGetGamma, XF86VidModeSetGamma, XF86VidModeSetGammaRamp, XF86VidModeGetGammaRamp, XF86VidModeGetGammaRampSize, and XF86VidModeGetPermissions functions need to be documented. In the meantime, check the source code for information about how to use them.