XmbufQueryExtension(3X11)XmbufQueryExtension(3X11)NAME
XmbufQueryExtension, XmbufGetVersion, XmbufCreateBuffers, XmbufDestroy‐
Buffers, XmbufDisplayBuffers, XmbufGetWindowAttributes, XmbufChangeWin‐
dowAttributes, XmbufGetBufferAttributes, XmbufChangeBufferAttributes,
XmbufGetScreenInfo, XmbufCreateStereoWindow - X multibuffering func‐
tions
SYNOPSIS
#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 XmbufChangeWindowAt‐
tributes(
Display *dpy,
Window window,
unsigned long valuemask,
XmbufSetWindowAttributes *attributes ); Status XmbufGetBuffer‐
Attributes(
Display *dpy,
Multibuffer buffer,
XmbufBufferAttributes *attributes ); void XmbufChangeBufferAt‐
tributes(
Display *dpy,
Multibuffer buffer,
unsigned long valuemask,
XmbufSetBufferAttributes *attributes ); Status XmbufGetScreen‐
Info(
Display *dpy,
Drawable drawable,
int *nmono_return,
XmbufBufferInfo **mono_info_return,
int *nstereo_return,
XmbufBufferInfo **stereo_info_return ); Window XmbufCreat‐
eStereoWindow(
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 */ } XmbufUpdateNo‐
tifyEvent;
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 */ } XmbufBuffer‐
Attributes;
Per-buffer attributes that can be set:
typedef struct {
unsigned long event_mask; /* events that have been
selected */ } XmbufSetBufferAt‐
tributes;
Per-screen buffer info (there will be lists of them):
typedef struct {
VisualID visualid; /* visual useable at this depth */
int max_buffers; /* most buffers for this visual */
int depth; /* depth of buffers to be created */ } Xmbuf‐
BufferInfo;
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
Matc 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 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, 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
XmbufQueryExtension(3X11)
