From 58bce2d205bee3f5adb33b15efe73098e77429eb Mon Sep 17 00:00:00 2001
From: Richard Nelson <richard@lindenlab.com>
Date: Wed, 9 Sep 2009 01:26:44 +0000
Subject: merge -r132032-132812
 svn+ssh://svn.lindenlab.com/svn/linden/branches/gooey/gooey-1

---
 indra/llui/lllocalcliprect.cpp | 143 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 143 insertions(+)
 create mode 100644 indra/llui/lllocalcliprect.cpp

(limited to 'indra/llui/lllocalcliprect.cpp')

diff --git a/indra/llui/lllocalcliprect.cpp b/indra/llui/lllocalcliprect.cpp
new file mode 100644
index 0000000000..058b6ae178
--- /dev/null
+++ b/indra/llui/lllocalcliprect.cpp
@@ -0,0 +1,143 @@
+/** 
+* @file lllocalcliprect.cpp
+*
+* $LicenseInfo:firstyear=2009&license=viewergpl$
+* 
+* Copyright (c) 2009, Linden Research, Inc.
+* 
+* Second Life Viewer Source Code
+* The source code in this file ("Source Code") is provided by Linden Lab
+* to you under the terms of the GNU General Public License, version 2.0
+* ("GPL"), unless you have obtained a separate licensing agreement
+* ("Other License"), formally executed by you and Linden Lab.  Terms of
+* the GPL can be found in doc/GPL-license.txt in this distribution, or
+* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
+* 
+* There are special exceptions to the terms and conditions of the GPL as
+* it is applied to this Source Code. View the full text of the exception
+* in the file doc/FLOSS-exception.txt in this software distribution, or
+* online at
+* http://secondlifegrid.net/programs/open_source/licensing/flossexception
+* 
+* By copying, modifying or distributing this software, you acknowledge
+* that you have read and understood your obligations described above,
+* and agree to abide by those obligations.
+* 
+* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+* COMPLETENESS OR PERFORMANCE.
+* $/LicenseInfo$
+*/
+#include "linden_common.h"
+
+#include "lllocalcliprect.h"
+
+#include "llfontgl.h"
+#include "llgl.h"
+#include "llui.h"
+
+#include <stack>
+
+//---------------------------------------------------------------------------
+// LLScreenClipRect
+// implementation class in screen space
+//---------------------------------------------------------------------------
+class LLScreenClipRect
+{
+public:
+	LLScreenClipRect(const LLRect& rect, BOOL enabled = TRUE);
+	virtual ~LLScreenClipRect();
+
+private:
+	static void pushClipRect(const LLRect& rect);
+	static void popClipRect();
+	static void updateScissorRegion();
+
+private:
+	LLGLState		mScissorState;
+	BOOL			mEnabled;
+
+	static std::stack<LLRect> sClipRectStack;
+};
+
+/*static*/ std::stack<LLRect> LLScreenClipRect::sClipRectStack;
+
+
+LLScreenClipRect::LLScreenClipRect(const LLRect& rect, BOOL enabled)
+:	mScissorState(GL_SCISSOR_TEST),
+	mEnabled(enabled)
+{
+	if (mEnabled)
+	{
+		pushClipRect(rect);
+	}
+	mScissorState.setEnabled(!sClipRectStack.empty());
+	updateScissorRegion();
+}
+
+LLScreenClipRect::~LLScreenClipRect()
+{
+	if (mEnabled)
+	{
+		popClipRect();
+	}
+	updateScissorRegion();
+}
+
+//static 
+void LLScreenClipRect::pushClipRect(const LLRect& rect)
+{
+	LLRect combined_clip_rect = rect;
+	if (!sClipRectStack.empty())
+	{
+		LLRect top = sClipRectStack.top();
+		combined_clip_rect.intersectWith(top);
+
+		if(combined_clip_rect.isEmpty())
+		{
+			// avoid artifacts where zero area rects show up as lines
+			combined_clip_rect = LLRect::null;
+		}
+	}
+	sClipRectStack.push(combined_clip_rect);
+}
+
+//static 
+void LLScreenClipRect::popClipRect()
+{
+	sClipRectStack.pop();
+}
+
+//static
+void LLScreenClipRect::updateScissorRegion()
+{
+	if (sClipRectStack.empty()) return;
+
+	LLRect rect = sClipRectStack.top();
+	stop_glerror();
+	S32 x,y,w,h;
+	x = llfloor(rect.mLeft * LLUI::sGLScaleFactor.mV[VX]);
+	y = llfloor(rect.mBottom * LLUI::sGLScaleFactor.mV[VY]);
+	w = llmax(0, llceil(rect.getWidth() * LLUI::sGLScaleFactor.mV[VX])) + 1;
+	h = llmax(0, llceil(rect.getHeight() * LLUI::sGLScaleFactor.mV[VY])) + 1;
+	glScissor( x,y,w,h );
+	stop_glerror();
+}
+
+//---------------------------------------------------------------------------
+// LLLocalClipRect
+//---------------------------------------------------------------------------
+LLLocalClipRect::LLLocalClipRect(const LLRect& rect, BOOL enabled /* = TRUE */)
+{
+	LLRect screen(rect.mLeft + LLFontGL::sCurOrigin.mX, 
+		rect.mTop + LLFontGL::sCurOrigin.mY, 
+		rect.mRight + LLFontGL::sCurOrigin.mX, 
+		rect.mBottom + LLFontGL::sCurOrigin.mY);
+	mScreenClipRect = new LLScreenClipRect(screen, enabled);
+}
+
+LLLocalClipRect::~LLLocalClipRect()
+{
+	delete mScreenClipRect;
+	mScreenClipRect = NULL;
+}
-- 
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