Add GetScreenResourcesCurrent

randr.h

@@ -2,6 +2,7 @@
  * Copyright © 2000 Compaq Computer Corporation
  * Copyright © 2002 Hewlett Packard Company
  * Copyright © 2006 Intel Corporation
+ * Copyright © 2008 Red Hat, Inc.
  *
  * Permission to use, copy, modify, distribute, and sell this software and its
  * documentation for any purpose is hereby granted without fee, provided that
@@ -77,6 +78,9 @@ typedef unsigned long	XRandrModeFlags;
 #define X_RRGetCrtcGamma	    23
 #define X_RRSetCrtcGamma	    24
 
+/* V1.3 additions */
+#define X_RRGetScreenResourcesCurrent	25
+
 /* Event selection bits */
 #define RRScreenChangeNotifyMask  (1L << 0)
 /* V1.2 additions */

randrproto.h

@@ -2,6 +2,7 @@
  * Copyright © 2000 Compaq Computer Corporation
  * Copyright © 2002 Hewlett-Packard Company
  * Copyright © 2006 Intel Corporation
+ * Copyright © 2008 Red Hat, Inc.
  *
  * Permission to use, copy, modify, distribute, and sell this software and its
  * documentation for any purpose is hereby granted without fee, provided that
@@ -561,6 +562,34 @@ typedef struct {
 } xRRSetCrtcGammaReq;
 #define sz_xRRSetCrtcGammaReq		12
 
+/*
+ * Additions for V1.3
+ */
+
+typedef struct {
+    CARD8   reqType;
+    CARD8   randrReqType;
+    CARD16  length B16;
+    Window  window B32;
+} xRRGetScreenResourcesCurrentReq;
+#define sz_xRRGetScreenResourcesCurrentReq 8
+
+typedef struct {
+    BYTE	type;
+    CARD8	pad;
+    CARD16	sequenceNumber B16;
+    CARD32	length B32;
+    Time	timestamp B32;
+    Time	configTimestamp B32;
+    CARD16	nCrtcs B16;
+    CARD16	nOutputs B16;
+    CARD16	nModes B16;
+    CARD16	nbytesNames B16;
+    CARD32	pad1 B32;
+    CARD32	pad2 B32;
+} xRRGetScreenResourcesCurrentReply;
+#define sz_xRRGetScreenResourcesCurrentReply	32
+
 /*
  * event
  */

randrproto.txt

@@ -528,10 +528,10 @@ dynamic changes in the display environment.
 	
 	This request explicitly asks the server to ensure that the
 	configuration data is up-to-date wrt the hardware. If that requires
-	polling, this is when such polling would take place. Requests for
-	further information should not poll, but rather return the data
-	collected at this point.
-	
+	polling, this is when such polling would take place.  If the
+	current configuration is all that's required, use
+	RRGetScreenResourcesCurrent instead.
+
 ┌───
     RRGetOutputInfo
 	output: OUTPUT
@@ -968,6 +968,40 @@ dynamic changes in the display environment.
 	must be the size returned by RRGetCrtcGammaSize else a Value error
 	results.
 
+7.2. Extension Requests added in version 1.3 of the extension
+
+┌───
+    RRGetScreenResourcesCurrent
+	window: WINDOW
+      ▶
+	timestamp: TIMESTAMP
+	config-timestamp: TIMESTAMP
+	crtcs: LISTofCRTC
+	outputs: LISTofOUTPUT
+	modes: LISTofMODEINFO
+└───
+	Errors: Window
+
+	RRGetScreenResourcesCurrent returns the list of outputs and crtcs
+	connected to the screen associated with 'window'.
+
+	'timestamp' indicates when the configuration was last set.
+	
+	'config-timestamp' indicates when the configuration information last
+	changed. Requests to configure the output will fail unless the
+	timestamp indicates that the information the client is using is up
+	to date, to ensure clients can be well behaved in the face of race
+	conditions.
+
+	'crtcs' contains the list of CRTCs associated with the screen.
+
+	'outputs' contains the list of outputs associated with the screen.
+
+	'modes' contains the list of modes associated with the screen
+	
+	Unlike RRGetScreenResources, this merely returns the current
+	configuration, and does not poll for hardware changes.
+
                               ❧❧❧❧❧❧❧❧❧❧❧
 
 8. Extension Events
@@ -1128,6 +1162,8 @@ list of what each version provided:
 	1.2: Separate screens from CRTCs and outputs, switch to full VESA
 	     modes
 
+	1.3: Added cheap version of RRGetScreenResources.
+
 Compatibility between 0.0 and 1.0 was *NOT* preserved, and 0.0 clients
 will fail against 1.0 servers. The wire encoding op-codes were
 changed for GetScreenInfo to ensure this failure in a relatively
@@ -1135,7 +1171,8 @@ graceful way. Version 1.1 servers and clients are cross compatible with
 1.0. Version 1.1 is considered to be stable and we intend upward
 compatibility from this point. Version 1.2 offers an extended model of the
 system with multiple output support. It offers backward compatibility with
-version 1.1.
+version 1.1. Version 1.3 adds a cheap version of GetScreenResources to
+avoid expensive DDC operations.
 
                               ❧❧❧❧❧❧❧❧❧❧❧
 
@@ -1681,6 +1718,33 @@ A.2.1 Protocol Requests added with version 1.2
 	p				unused, p=pad(6n)
 └───
 
+A.2.2 Protocol Requests added with version 1.2
+
+┌───
+    RRGetScreenResourcesCurrent
+	1	CARD8			major opcode
+	1	8			RandR opcode
+	2	2			length
+	4	WINDOW			window
+      ▶
+	1	1			Reply
+	1				unused
+	2	CARD16			sequence number
+	4	c+o+8m+(b+p)/4		reply length
+	4	TIMESTAMP		timestamp
+	4	TIMESTAMP		config-timestamp
+	2	c			number of CRTCs
+	2	o			number of outputs
+	2	m			number of modeinfos
+	2	b			total bytes in mode names
+	8				unused
+	4c	LISTofCRTC		crtcs
+	4o	LISTofOUTPUT		outputs
+	32m	LISTofMODEINFO		modeinfos
+	b	STRING8			mode names
+	p				unused, p=pad(b)
+└───
+
 A.3 Protocol Events
 
 ┌───