Fix Pending property API, adding RRPostPendingProperty.

Pending Properties take effect when the driver says they do, so provide an
API to tell DIX when a property effect is made. Also, allow driver
to reject property values in RRChangeOutputProperty.
(cherry picked from commit 8eb288fbd69e2ffd02521d2c6a964c8180d08ec8)

1 files changed, 94 insertions, 57 deletions

diff --git a/randr/rrproperty.c b/randr/rrproperty.c
index edfed1f47..b0182daa7 100644
--- a/randr/rrproperty.c
+++ b/randr/rrproperty.c
@@ -121,19 +121,19 @@ RRDeleteOutputProperty (RROutputPtr output, Atom property)
 int
 RRChangeOutputProperty (RROutputPtr output, Atom property, Atom type,
 			int format, int mode, unsigned long len,
-			pointer value, Bool sendevent)
+			pointer value, Bool sendevent, Bool pending)
 {
     RRPropertyPtr		    prop;
     xRROutputPropertyNotifyEvent    event;
     rrScrPrivPtr		    pScrPriv = rrGetScrPriv(output->pScreen);
-    int				    sizeInBytes;
-    int				    totalSize;
-    pointer			    data;
+    int				    size_in_bytes;
+    int				    total_size;
+    unsigned long		    total_len;
     RRPropertyValuePtr		    prop_value;
+    RRPropertyValueRec		    new_value;
     Bool			    add = FALSE;
 
-    sizeInBytes = format >> 3;
-    totalSize = len * sizeInBytes;
+    size_in_bytes = format >> 3;
 
     /* first see if property already exists */
     prop = RRQueryOutputProperty (output, property);
@@ -145,7 +145,7 @@ RRChangeOutputProperty (RROutputPtr output, Atom property, Atom type,
 	add = TRUE;
 	mode = PropModeReplace;
     }
-    if (prop->is_pending)
+    if (pending && prop->is_pending)
 	prop_value = &prop->pending;
     else
 	prop_value = &prop->current;
@@ -159,68 +159,75 @@ RRChangeOutputProperty (RROutputPtr output, Atom property, Atom type,
 	return(BadMatch);
     if ((prop_value->type != type) && (mode != PropModeReplace))
 	return(BadMatch);
+    new_value = *prop_value;
     if (mode == PropModeReplace)
+	total_len = len;
+    else
+	total_len = prop_value->size + len;
+
+    if (mode == PropModeReplace || len > 0)
     {
-	if (totalSize != prop_value->size * (prop_value->format >> 3))
+	pointer	    new_data, old_data;
+	
+	total_size = total_len * size_in_bytes;
+	new_value.data = (pointer)xalloc (total_size);
+	if (!new_value.data && total_size)
 	{
-	    if (prop_value->data)
-		data = (pointer)xrealloc(prop_value->data, totalSize);
-	    else
-		data = (pointer)xalloc (totalSize);
-	    if (!data && len)
-	    {
-		if (add)
-		    RRDestroyOutputProperty (prop);
-		return(BadAlloc);
-	    }
-	    prop_value->data = data;
+	    if (add)
+		RRDestroyOutputProperty (prop);
+	    return BadAlloc;
 	}
 	if (len)
-	    memmove((char *)prop_value->data, (char *)value, totalSize);
-	prop_value->size = len;
-	prop_value->type = type;
-	prop_value->format = format;
+	    memmove((char *)new_value.data, (char *)value, total_size);
+	new_value.size = len;
+	new_value.type = type;
+	new_value.format = format;
+
+	switch (mode) {
+	case PropModeReplace:
+	    new_data = new_value.data;
+	    old_data = NULL;
+	    break;
+	case PropModeAppend:
+	    new_data = (pointer) (((char *) new_value.data) + 
+				  (prop_value->size * size_in_bytes));
+	    old_data = new_value.data;
+	    break;
+	case PropModePrepend:
+	    new_data = new_value.data;
+	    old_data = (pointer) (((char *) new_value.data) + 
+				  (prop_value->size * size_in_bytes));
+	    break;
+	}
+	memcpy ((char *) new_data, (char *) value, len * size_in_bytes);
+	if (old_data)
+	    memcpy ((char *) old_data, (char *) prop_value->data, 
+		    prop_value->size * size_in_bytes);
+	
+	if (pending && pScrPriv->rrOutputSetProperty &&
+	    !pScrPriv->rrOutputSetProperty(output->pScreen, output,
+					   prop->propertyName, &new_value))
+	{
+	    if (new_value.data)
+		xfree (new_value.data);
+	    return (BadValue);
+	}
+	if (prop_value->data)
+	    xfree (prop_value->data);
+	*prop_value = new_value;
     }
+    
     else if (len == 0)
     {
 	/* do nothing */
     }
-    else if (mode == PropModeAppend)
-    {
-	data = (pointer)xrealloc(prop_value->data,
-				 sizeInBytes * (len + prop_value->size));
-	if (!data)
-	    return(BadAlloc);
-	prop_value->data = data;
-	memmove(&((char *)data)[prop_value->size * sizeInBytes], 
-		(char *)value,
-	      totalSize);
-	prop_value->size += len;
-    }
-    else if (mode == PropModePrepend)
-    {
-	data = (pointer)xalloc(sizeInBytes * (len + prop_value->size));
-	if (!data)
-	    return(BadAlloc);
-	memmove(&((char *)data)[totalSize], (char *)prop_value->data, 
-	      (int)(prop_value->size * sizeInBytes));
-	memmove((char *)data, (char *)value, totalSize);
-	xfree(prop_value->data);
-	prop_value->data = data;
-	prop_value->size += len;
-    }
+    
     if (add)
     {
 	prop->next = output->properties;
 	output->properties = prop;
     }
 
-    if (!prop->is_pending) {
-	/* What should we do in case of failure? */
-	pScrPriv->rrOutputSetProperty(output->pScreen, output,
-				      prop->propertyName, prop_value);
-    }
-
     if (sendevent)
     {
 	event.type = RREventBase + RRNotify;
@@ -234,6 +241,33 @@ RRChangeOutputProperty (RROutputPtr output, Atom property, Atom type,
     return(Success);
 }
 
+Bool
+RRPostPendingProperty (RROutputPtr output, Atom property)
+{
+    RRPropertyPtr		    prop = RRQueryOutputProperty (output, property);
+    RRPropertyValuePtr		    pending_value;
+    RRPropertyValuePtr		    current_value;
+    
+    if (!prop)
+	return FALSE;
+    if (!prop->is_pending)
+	return FALSE;
+    pending_value = &prop->pending;
+    current_value = &prop->current;
+
+    if (pending_value->type == current_value->type &&
+	pending_value->format == current_value->format &&
+	pending_value->size == current_value->size &&
+	!memcmp (pending_value->data, current_value->data, pending_value->size))
+	return TRUE;
+    
+    if (RRChangeOutputProperty (output, property, 
+				pending_value->type, pending_value->format, PropModeReplace,
+				pending_value->size, pending_value->data, TRUE, FALSE) != Success)
+	return FALSE;
+    return TRUE;
+}
+
 RRPropertyPtr
 RRQueryOutputProperty (RROutputPtr output, Atom property)
 {
@@ -474,7 +508,7 @@ ProcRRChangeOutputProperty (ClientPtr client)
 
     err = RRChangeOutputProperty(output, stuff->property,
 				 stuff->type, (int)format,
-				 (int)mode, len, (pointer)&stuff[1], TRUE);
+				 (int)mode, len, (pointer)&stuff[1], TRUE, TRUE);
     if (err != Success)
 	return err;
     else
@@ -508,8 +542,8 @@ int
 ProcRRGetOutputProperty (ClientPtr client)
 {
     REQUEST(xRRGetOutputPropertyReq);
-    RRPropertyPtr			prop, *prev;
-    RRPropertyValuePtr			prop_value;
+    RRPropertyPtr		prop, *prev;
+    RRPropertyValuePtr		prop_value;
     unsigned long		n, len, ind;
     RROutputPtr			output;
     xRRGetOutputPropertyReply	reply;
@@ -600,7 +634,10 @@ ProcRRGetOutputProperty (ClientPtr client)
     reply.bytesAfter = n - (ind + len);
     reply.format = prop_value->format;
     reply.length = (len + 3) >> 2;
-    reply.nItems = len / (prop_value->format / 8 );
+    if (prop_value->format)
+	reply.nItems = len / (prop_value->format / 8);
+    else
+	reply.nItems = 0;
     reply.propertyType = prop_value->type;
 
     if (stuff->delete && (reply.bytesAfter == 0))