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.

2 files changed, 0 insertions, 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;