From 41f78f788431dea860a5438fb66beaa3b486bd28 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Stephan=20A=C3=9Fmus?= <superstippi@gmx.de>
Date: Fri, 11 Nov 2005 00:14:58 +0000
Subject: [PATCH] the current clipping is the combined user defined clipping
 from all previous states

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@14846 a95241bf-73f2-0310-859d-f6bbb57e9c96
---
 src/servers/app/DrawState.cpp | 22 +++++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)

diff --git a/src/servers/app/DrawState.cpp b/src/servers/app/DrawState.cpp
index 6dbf9c92ec..07546af8e2 100644
--- a/src/servers/app/DrawState.cpp
+++ b/src/servers/app/DrawState.cpp
@@ -66,7 +66,10 @@ DrawState::operator=(const DrawState& from)
 	fScale	= from.fScale;
 
 	if (from.fClippingRegion) {
-		SetClippingRegion(*(from.fClippingRegion));
+		if (fClippingRegion)
+			*fClippingRegion = *from.fClippingRegion;
+		else
+			fClippingRegion = new BRegion(*from.fClippingRegion);
 	} else {
 		delete fClippingRegion;
 		fClippingRegion = NULL;
@@ -302,15 +305,24 @@ DrawState::SetScale(float scale)
 void
 DrawState::SetClippingRegion(const BRegion& region)
 {
-	if (region.Frame().IsValid()) {
+	// reset clipping to that of previous state
+	if (PreviousState() != NULL && PreviousState()->ClippingRegion()) {
 		if (fClippingRegion)
-			*fClippingRegion = region;
-		else 
-			fClippingRegion = new BRegion(region);
+			*fClippingRegion = *(PreviousState()->ClippingRegion());
+		else
+			fClippingRegion = new BRegion(*(PreviousState()->ClippingRegion()));
 	} else {
 		delete fClippingRegion;
 		fClippingRegion = NULL;
 	}
+
+	// add the clipping from the passed region
+	if (region.Frame().IsValid()) {
+		if (fClippingRegion)
+			fClippingRegion->IntersectWith(&region);
+		else 
+			fClippingRegion = new BRegion(region);
+	}
 }