From 7a21e7bc994c5fa7d3ab15ba7201667e134f1512 Mon Sep 17 00:00:00 2001
From: Keith Packard <keithp@keithp.com>
Date: Tue, 18 Mar 2008 16:02:36 -0700
Subject: Eliminate inverse matrix from randr transform protocol

It is easier, and potentially more precise, to compute the inverse in the
server where everything can eventually be kept in floating point form.
---
 include/X11/extensions/Xrandr.h | 3 ---
 src/XrrCrtc.c                   | 8 --------
 2 files changed, 11 deletions(-)

diff --git a/include/X11/extensions/Xrandr.h b/include/X11/extensions/Xrandr.h
index 32171f9..de18f3b 100644
--- a/include/X11/extensions/Xrandr.h
+++ b/include/X11/extensions/Xrandr.h
@@ -378,19 +378,16 @@ void
 XRRSetCrtcTransform (Display	*dpy,
 		     RRCrtc	crtc, 
 		     XTransform	*transform,
-		     XTransform	*inverse,
 		     char	*filter,
 		     XFixed	*params,
 		     int	nparams);
 
 typedef struct _XRRCrtcTransformAttributes {
     XTransform	pendingTransform;
-    XTransform	pendingInverse;
     char	*pendingFilter;
     int		pendingNparams;
     XFixed	*pendingParams;
     XTransform	currentTransform;
-    XTransform	currentInverse;
     char	*currentFilter;
     int		currentNparams;
     XFixed	*currentParams;
diff --git a/src/XrrCrtc.c b/src/XrrCrtc.c
index 8bca1b1..a1d92cb 100644
--- a/src/XrrCrtc.c
+++ b/src/XrrCrtc.c
@@ -311,7 +311,6 @@ void
 XRRSetCrtcTransform (Display	*dpy,
 		     RRCrtc	crtc, 
 		     XTransform	*transform,
-		     XTransform	*inverse,
 		     char	*filter,
 		     XFixed	*params,
 		     int	nparams)
@@ -329,7 +328,6 @@ XRRSetCrtcTransform (Display	*dpy,
     req->crtc = crtc;
 
     xRenderTransform_from_XTransform (&req->transform, transform);
-    xRenderTransform_from_XTransform (&req->inverse, inverse);
 
     req->nbytesFilter = nbytes;
     req->length += ((nbytes + 3) >> 2) + nparams;
@@ -377,11 +375,9 @@ XRRGetCrtcTransform (Display	*dpy,
     {
 	/* For pre-1.3 servers, just report identity matrices everywhere */
 	rep.pendingTransform = identity;
-	rep.pendingInverse = identity;
 	rep.pendingNbytesFilter = 0;
 	rep.pendingNparamsFilter = 0;
 	rep.currentTransform = identity;
-	rep.currentInverse = identity;
 	rep.currentNbytesFilter = 0;
 	rep.currentNparamsFilter = 0;
     }
@@ -396,11 +392,9 @@ XRRGetCrtcTransform (Display	*dpy,
 	if (!_XReply (dpy, (xReply *) &rep, CrtcTransformExtra >> 2, xFalse))
 	{
 	    rep.pendingTransform = identity;
-	    rep.pendingInverse = identity;
 	    rep.pendingNbytesFilter = 0;
 	    rep.pendingNparamsFilter = 0;
 	    rep.currentTransform = identity;
-	    rep.currentInverse = identity;
 	    rep.currentNbytesFilter = 0;
 	    rep.currentNparamsFilter = 0;
 	}
@@ -432,9 +426,7 @@ XRRGetCrtcTransform (Display	*dpy,
 	return False;
     }
     XTransform_from_xRenderTransform (&attr->pendingTransform, &rep.pendingTransform);
-    XTransform_from_xRenderTransform (&attr->pendingInverse, &rep.pendingInverse);
     XTransform_from_xRenderTransform (&attr->currentTransform, &rep.currentTransform);
-    XTransform_from_xRenderTransform (&attr->currentInverse, &rep.currentInverse);
 
     attr->pendingParams = (XFixed *) (attr + 1);
     attr->currentParams = attr->pendingParams + rep.pendingNparamsFilter;
-- 
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