XMBUF - Online Linux Manual PageSection : 3
Updated : libXext 1.3.5
Source : X Version 11
Note : X FUNCTIONS

NAMEXmbufQueryExtension, XmbufGetVersion, XmbufCreateBuffers, XmbufDestroyBuffers, XmbufDisplayBuffers, XmbufGetWindowAttributes, XmbufChangeWindowAttributes, XmbufGetBufferAttributes, XmbufChangeBufferAttributes, XmbufGetScreenInfo, XmbufCreateStereoWindow - X multibuffering functions

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);

STRUCTURESEvents: 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;

DESCRIPTIONThe 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 routines are called with a display that does not support the extension, the ExtensionErrorHandler (which can be set with  XSetExtensionErrorHandler  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 constants  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 extension. 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 indicated window. The number of buffers created is returned (zero if an error occurred) and buffers_update is filled in with that many Multibuffer identifiers.  XmbufDestroyBuffers  destroys the buffers associated with the given window.  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 currently 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 buffer. 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 numbers 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 encountered, 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, respectively. If an extension error handler that returns is installed,  None  will be returned if the extension is not available on this display.

PREDEFINED VALUESUpdate_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  

BUGSThis manual page needs more work.

SEE ALSOExtending X for Double Buffering, Multi-Buffering, and Stereo
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