1XMBUF(3)                          X FUNCTIONS                         XMBUF(3)
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NAME

6       XmbufQueryExtension, XmbufGetVersion, XmbufCreateBuffers, XmbufDestroy‐
7       Buffers, XmbufDisplayBuffers, XmbufGetWindowAttributes, XmbufChangeWin‐
8       dowAttributes,  XmbufGetBufferAttributes,  XmbufChangeBufferAttributes,
9       XmbufGetScreenInfo, XmbufCreateStereoWindow -  X  multibuffering  func‐
10       tions
11

SYNTAX

13       #include <X11/extensions/multibuf.h>
14
15       Bool XmbufQueryExtension(
16           Display *dpy,
17           Display *dpy,
18           int *event_base_return,
19           int *error_base_return);
20
21       Status XmbufGetVersion(
22           Display *dpy,
23           int *major_version_return,
24           int *minor_version_return);
25
26       int XmbufCreateBuffers(
27           Display *dpy,
28           Window window,
29           int count,
30           int update_action,
31           int update_hint,
32           Multibuffer *buffers_update);
33
34       void XmbufDestroyBuffers(
35           Display *dpy,
36           Window window);
37
38       void XmbufDisplayBuffers(
39           Display *dpy,
40           int count,
41           Multibuffer *buffers,
42           int min_delay,
43           int max_delay);
44
45       Status XmbufGetWindowAttributes(
46           Display *dpy,
47           Window window,
48           XmbufWindowAttributes *attributes);
49
50       void XmbufChangeWindowAttributes(
51           Display *dpy,
52           Window window,
53           unsigned long valuemask,
54           XmbufSetWindowAttributes *attributes);
55
56       Status XmbufGetBufferAttributes(
57           Display *dpy,
58           Multibuffer buffer,
59           XmbufBufferAttributes *attributes);
60
61       void XmbufChangeBufferAttributes(
62           Display *dpy,
63           Multibuffer buffer,
64           unsigned long valuemask,
65           XmbufSetBufferAttributes *attributes);
66
67       Status XmbufGetScreenInfo(
68           Display *dpy,
69           Drawable drawable,
70           int *nmono_return,
71           XmbufBufferInfo **mono_info_return,
72           int *nstereo_return,
73           XmbufBufferInfo **stereo_info_return);
74
75       Window XmbufCreateStereoWindow(
76           Display *dpy,
77           Window parent,
78           int x,
79           int y,
80           unsigned int width,
81           unsigned int height,
82           unsigned int border_width,
83           int depth,
84           unsigned int class,                 /* InputOutput, InputOnly*/
85           Visual *visual,
86           unsigned long valuemask,
87           XSetWindowAttributes *attributes,
88           Multibuffer *left_return,
89           Multibuffer *right_return);
90

STRUCTURES

92       Events:
93       typedef struct {
94           int type;   /* of event */
95           unsigned long serial;       /* # of last request processed by server */
96           int send_event;     /* true if this came from a SendEvent request */
97           Display *display;   /* Display the event was read from */
98           Multibuffer buffer; /* buffer of event */
99           int state;  /* see Clobbered constants above */
100       } XmbufClobberNotifyEvent;
101
102       typedef struct {
103           int type;   /* of event */
104           unsigned long serial;       /* # of last request processed by server */
105           int send_event;     /* true if this came from a SendEvent request */
106           Display *display;   /* Display the event was read from */
107           Multibuffer buffer; /* buffer of event */
108       } XmbufUpdateNotifyEvent;
109
110       Per-window attributes that can be got:
111
112       typedef struct {
113           int displayed_index; /* which buffer is being displayed */
114           int update_action;   /* Undefined, Background, Untouched, Copied */
115           int update_hint;     /* Frequent, Intermittent, Static */
116           int window_mode;     /* Mono, Stereo */
117           int nbuffers;   /* Number of buffers */
118           Multibuffer *buffers;     /* Buffers */
119       } XmbufWindowAttributes;
120
121       Per-window attributes that can be set:
122
123       typedef struct {
124           int update_hint;     /* Frequent, Intermittent, Static */
125       } XmbufSetWindowAttributes;
126
127       Per-buffer attributes that can be got:
128
129       typedef struct {
130           Window window;  /* which window this belongs to */
131           unsigned long event_mask; /* events that have been selected */
132           int buffer_index;    /* which buffer is this */
133           int side;  /* Mono, Left, Right */
134       } XmbufBufferAttributes;
135
136       Per-buffer attributes that can be set:
137
138       typedef struct {
139           unsigned long event_mask; /* events that have been selected */
140       } XmbufSetBufferAttributes;
141
142       Per-screen buffer info (there will be lists of them):
143
144       typedef struct {
145           VisualID visualid;   /* visual usable at this depth */
146           int max_buffers;     /* most buffers for this visual */
147           int depth; /* depth of buffers to be created */
148       } XmbufBufferInfo;
149

DESCRIPTION

151       The  application  programming  library  for  the  X11 Double-Buffering,
152       Multi-Buffering, and Stereo Extension contains the interfaces described
153       below.  With the exception of XmbufQueryExtension, if any of these rou‐
154       tines are called with a display that does not  support  the  extension,
155       the ExtensionErrorHandler (which can be set with XSetExtensionErrorHan‐
156       dler and functions the same way as XSetErrorHandler) will be called and
157       the function will then return.
158
159       XmbufQueryExtension returns True if the multibuffering/stereo extension
160       is available on the given display.  If the extension exists, the  value
161       of  the  first event code (which should be added to the event type con‐
162       stants MultibufferClobberNotify and MultibufferUpdateNotify to get  the
163       actual  values)  is  stored into event_base_return and the value of the
164       first error code (which should be added  to  the  error  type  constant
165       MultibufferBadBuffer   to   get   the  actual  value)  is  stored  into
166       error_base_return.
167
168       XmbufGetVersion gets the major and minor version numbers of the  exten‐
169       sion.   The  return  value is zero if an error occurs or non-zero if no
170       error happens.
171
172       XmbufCreateBuffers requests that "count" buffers be  created  with  the
173       given  update_action  and  update_hint and be associated with the indi‐
174       cated window.  The number of buffers created is returned  (zero  if  an
175       error  occurred)  and buffers_update is filled in with that many Multi‐
176       buffer identifiers.
177
178       XmbufDestroyBuffers destroys the buffers associated with the given win‐
179       dow.
180
181       XmbufDisplayBuffers  displays  the  indicated buffers their appropriate
182       windows within max_delay milliseconds after min_delay milliseconds have
183       passed.   No two buffers may be associated with the same window or else
184       a Match error is generated.
185
186       XmbufGetWindowAttributes gets the multibuffering attributes that  apply
187       to  all  buffers associated with the given window.  The list of buffers
188       returns may be freed with XFree.  Returns non-zero on success and  zero
189       if an error occurs.
190
191       XmbufChangeWindowAttributes  sets  the  multibuffering  attributes that
192       apply to all buffers associated with the given window.   This  is  cur‐
193       rently limited to the update_hint.
194
195       XmbufGetBufferAttributes  gets the attributes for the indicated buffer.
196       Returns non-zero on success and zero if an error occurs.
197
198       XmbufChangeBufferAttributes sets the attributes for the indicated  buf‐
199       fer.  This is currently limited to the event_mask.
200
201       XmbufGetScreenInfo  gets the parameters controlling how mono and stereo
202       windows may be created on the screen of the given drawable.   The  num‐
203       bers  of  sets  of  visual  and depths are returned in nmono_return and
204       nstereo_return.   If  nmono_return   is   greater   than   zero,   then
205       mono_info_return  is  set to the address of an array of XmbufBufferInfo
206       structures describing the various visuals and depths that may be  used.
207       Otherwise,    mono_info_return    is    set    to   NULL.    Similarly,
208       stereo_info_return is set according  to  nstereo_return.   The  storage
209       returned  in mono_info_return and stereo_info_return may be released by
210       XFree.  If no errors are encounted, non-zero will be returned.
211
212       XmbufCreateStereoWindow creates a stereo window in the  same  way  that
213       XCreateWindow  creates  a mono window.  The buffer ids for the left and
214       right buffers are returned in  left_return  and  right_return,  respec‐
215       tively.   If an extension error handler that returns is installed, None
216       will be returned if the extension is not available on this display.
217

PREDEFINED VALUES

219       Update_action field:
220              MultibufferUpdateActionUndefined
221              MultibufferUpdateActionBackground
222              MultibufferUpdateActionUntouched
223              MultibufferUpdateActionCopied
224
225       Update_hint field:
226              MultibufferUpdateHintFrequent
227              MultibufferUpdateHintIntermittent
228              MultibufferUpdateHintStatic
229
230       Valuemask fields:
231              MultibufferWindowUpdateHint
232              MultibufferBufferEventMask
233
234       Mono vs. stereo and left vs. right:
235              MultibufferModeMono
236              MultibufferModeStereo
237              MultibufferSideMono
238              MultibufferSideLeft
239              MultibufferSideRight
240
241       Clobber state:
242              MultibufferUnclobbered
243              MultibufferPartiallyClobbered
244              MultibufferFullyClobbered
245
246       Event stuff:
247              MultibufferClobberNotifyMask
248              MultibufferUpdateNotifyMask
249              MultibufferClobberNotify
250              MultibufferUpdateNotify
251              MultibufferNumberEvents
252              MultibufferBadBuffer
253              MultibufferNumberErrors
254

BUGS

256       This manual page needs more work.
257

SEE ALSO

259       Extending X for Double Buffering, Multi-Buffering, and Stereo
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263X Version 11                     libXext 1.3.4                        XMBUF(3)
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