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XmbufQueryExtension(3)





NAME

       XmbufQueryExtension, XmbufGetVersion, XmbufCreateBuffers, XmbufDestroy-
       Buffers, XmbufDisplayBuffers, XmbufGetWindowAttributes, XmbufChangeWin-
       dowAttributes,  XmbufGetBufferAttributes,  XmbufChangeBufferAttributes,
       XmbufGetScreenInfo, XmbufCreateStereoWindow -  X  multibuffering  func-
       tions


SYNTAX

       #include <X11/extensions/multibuf.h>

       Bool XmbufQueryExtension(
           Display *dpy,
           Display *dpy,
           int *event_base_return,
           int *error_base_return);

       Status XmbufGetVersion(
           Display *dpy,
           int *major_version_return,
           int *minor_version_return);

       int XmbufCreateBuffers(
           Display *dpy,
           Window window,
           int count,
           int update_action,
           int update_hint,
           Multibuffer *buffers_update);

       void XmbufDestroyBuffers(
           Display *dpy,
           Window window);

       void XmbufDisplayBuffers(
           Display *dpy,
           int count,
           Multibuffer *buffers,
           int min_delay,
           int max_delay);

       Status XmbufGetWindowAttributes(
           Display *dpy,
           Window window,
           XmbufWindowAttributes *attributes);

       void XmbufChangeWindowAttributes(
           Display *dpy,
           Window window,
           unsigned long valuemask,
           XmbufSetWindowAttributes *attributes);

       Status XmbufGetBufferAttributes(
           Display *dpy,
           Multibuffer buffer,
           XmbufBufferAttributes *attributes);

       void XmbufChangeBufferAttributes(
           Display *dpy,
           Multibuffer buffer,
           unsigned long valuemask,
           XmbufSetBufferAttributes *attributes);

       Status XmbufGetScreenInfo(
           Display *dpy,
           Drawable drawable,
           int *nmono_return,
           XmbufBufferInfo **mono_info_return,
           int *nstereo_return,
           XmbufBufferInfo **stereo_info_return);

       Window XmbufCreateStereoWindow(
           Display *dpy,
           Window parent,
           int x,
           int y,
           unsigned int width,
           unsigned int height,
           unsigned int border_width,
           int depth,
           unsigned int class,                 /* InputOutput, InputOnly*/
           Visual *visual,
           unsigned long valuemask,
           XSetWindowAttributes *attributes,
           Multibuffer *left_return,
           Multibuffer *right_return);


STRUCTURES

       Events:
       typedef struct {
           int type;                 /* of event */
           unsigned long serial;     /* # of last request processed by server */
           int send_event;           /* true if this came from a SendEvent request */
           Display *display;         /* Display the event was read from */
           Multibuffer buffer;       /* buffer of event */
           int state;                /* see Clobbered constants above */
       } XmbufClobberNotifyEvent;

       typedef struct {
           int type;                 /* of event */
           unsigned long serial;     /* # of last request processed by server */
           int send_event;           /* true if this came from a SendEvent request */
           Display *display;         /* Display the event was read from */
           Multibuffer buffer;       /* buffer of event */
       } XmbufUpdateNotifyEvent;

       Per-window attributes that can be got:
       typedef struct {
           int displayed_index;      /* which buffer is being displayed */
           int update_action;        /* Undefined, Background, Untouched, Copied */
           int update_hint;          /* Frequent, Intermittent, Static */
           int window_mode;          /* Mono, Stereo */
           int nbuffers;             /* Number of buffers */
           Multibuffer *buffers;     /* Buffers */
       } XmbufWindowAttributes;

       Per-window attributes that can be set:
       typedef struct {
           int update_hint;          /* Frequent, Intermittent, Static */
       } XmbufSetWindowAttributes;

       Per-buffer attributes that can be got:
       typedef struct {
           Window window;            /* which window this belongs to */
           unsigned long event_mask; /* events that have been selected */
           int buffer_index;         /* which buffer is this */
           int side;                 /* Mono, Left, Right */
       } XmbufBufferAttributes;

       Per-buffer attributes that can be set:
       typedef struct {
           unsigned long event_mask; /* events that have been selected */
       } XmbufSetBufferAttributes;

       Per-screen buffer info (there will be lists of them):
       typedef struct {
           VisualID visualid;        /* visual usable at this depth */
           int max_buffers;          /* most buffers for this visual */
           int depth;                /* depth of buffers to be created */
       } XmbufBufferInfo;


DESCRIPTION

       The  application  programming  library  for  the  X11 Double-Buffering,
       Multi-Buffering, and Stereo Extension contains the interfaces described
       below.  With the exception of XmbufQueryExtension, if any of these rou-
       tines are called with a display that does not  support  the  extension,
       the ExtensionErrorHandler (which can be set with XSetExtensionErrorHan-
       dler and functions the same way as XSetErrorHandler) will be called and
       the function will then return.

       XmbufQueryExtension returns True if the multibuffering/stereo extension
       is available on the given display.  If the extension exists, the  value
       of  the  first event code (which should be added to the event type con-
       stants MultibufferClobberNotify and MultibufferUpdateNotify to get  the
       actual  values)  is  stored into event_base_return and the value of the
       first error code (which should be added  to  the  error  type  constant
       MultibufferBadBuffer   to   get   the  actual  value)  is  stored  into
       error_base_return.

       XmbufGetVersion gets the major and minor version numbers of the  exten-
       sion.   The  return  value is zero if an error occurs or non-zero if no
       error happens.

       XmbufCreateBuffers requests that "count" buffers be  created  with  the
       given  update_action  and  update_hint and be associated with the indi-
       cated window.  The number of buffers created is returned  (zero  if  an
       error  occurred)  and buffers_update is filled in with that many Multi-
       buffer identifiers.

       XmbufDestroyBuffers destroys the buffers associated with the given win-
       dow.

       XmbufDisplayBuffers  displays  the  indicated buffers their appropriate
       windows within max_delay milliseconds after min_delay milliseconds have
       passed.   No two buffers may be associated with the same window or else
       a Match error is generated.

       XmbufGetWindowAttributes gets the multibuffering attributes that  apply
       to  all  buffers associated with the given window.  The list of buffers
       returns may be freed with XFree.  Returns non-zero on success and  zero
       if an error occurs.

       XmbufChangeWindowAttributes  sets  the  multibuffering  attributes that
       apply to all buffers associated with the given window.   This  is  cur-
       rently limited to the update_hint.

       XmbufGetBufferAttributes  gets the attributes for the indicated buffer.
       Returns non-zero on success and zero if an error occurs.

       XmbufChangeBufferAttributes sets the attributes for the indicated  buf-
       fer.  This is currently limited to the event_mask.

       XmbufGetScreenInfo  gets the parameters controlling how mono and stereo
       windows may be created on the screen of the given drawable.   The  num-
       bers  of  sets  of  visual  and depths are returned in nmono_return and
       nstereo_return.   If  nmono_return   is   greater   than   zero,   then
       mono_info_return  is  set to the address of an array of XmbufBufferInfo
       structures describing the various visuals and depths that may be  used.
       Otherwise,    mono_info_return    is    set    to   NULL.    Similarly,
       stereo_info_return is set according  to  nstereo_return.   The  storage
       returned  in mono_info_return and stereo_info_return may be released by
       XFree.  If no errors are encounted, non-zero will be returned.

       XmbufCreateStereoWindow creates a stereo window in the  same  way  that
       XCreateWindow  creates  a mono window.  The buffer ids for the left and
       right buffers are returned in  left_return  and  right_return,  respec-
       tively.   If an extension error handler that returns is installed, None
       will be returned if the extension is not available on this display.


PREDEFINED VALUES

       Update_action field:
            MultibufferUpdateActionUndefined
            MultibufferUpdateActionBackground
            MultibufferUpdateActionUntouched
            MultibufferUpdateActionCopied

       Update_hint field:
            MultibufferUpdateHintFrequent
            MultibufferUpdateHintIntermittent
            MultibufferUpdateHintStatic

       Valuemask fields:
            MultibufferWindowUpdateHint
            MultibufferBufferEventMask

       Mono vs. stereo and left vs. right:
            MultibufferModeMono
            MultibufferModeStereo
            MultibufferSideMono
            MultibufferSideLeft
            MultibufferSideRight

       Clobber state:
            MultibufferUnclobbered
            MultibufferPartiallyClobbered
            MultibufferFullyClobbered

       Event stuff:
            MultibufferClobberNotifyMask
            MultibufferUpdateNotifyMask
            MultibufferClobberNotify
            MultibufferUpdateNotify
            MultibufferNumberEvents
            MultibufferBadBuffer
            MultibufferNumberErrors


BUGS

       This manual page needs more work.


SEE ALSO

       Extending X for Double Buffering, Multi-Buffering, and Stereo

X Version 11                     libXext 1.0.3                        XMBUF(3)

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