From 5fa60a7abaa72ba95b90a4587476b940e764d889 Mon Sep 17 00:00:00 2001
From: Timothy Pearson <kb9vqf@pearsoncomputing.net>
Date: Mon, 17 Sep 2012 15:20:04 -0500
Subject: [PATCH] Add world matrix stack

---
 tdegtk/tqtcairopainter.cpp | 26 ++++++++++++++++++++------
 tdegtk/tqtcairopainter.h   |  5 +++++
 2 files changed, 25 insertions(+), 6 deletions(-)

diff --git a/tdegtk/tqtcairopainter.cpp b/tdegtk/tqtcairopainter.cpp
index 75d1b99..0e8da20 100644
--- a/tdegtk/tqtcairopainter.cpp
+++ b/tdegtk/tqtcairopainter.cpp
@@ -847,6 +847,7 @@ TQt3CairoPaintDevice::TQt3CairoPaintDevice( cairo_surface_t *cairosurface )
     : TQPaintDevice( TQInternal::Picture | TQInternal::ExternalDevice ), m_intermediateSurface(NULL), m_painter(NULL), m_devicePainter(NULL)
 {
 	m_surface = cairosurface;
+	m_worldMatrixStack.setAutoDelete(TRUE);
 }
 
 /*!
@@ -1174,6 +1175,7 @@ bool TQt3CairoPaintDevice::cmd( int c, TQPainter *pt, TQPDevCmdParam *p )
 			setCairoTransformations();
 			m_clipRegion = TQImage();
 			m_clipRegionEnabled = false;
+			m_worldMatrixStack.clear();
 		}
 		break;
 	    case PdcEnd:
@@ -1386,16 +1388,28 @@ bool TQt3CairoPaintDevice::cmd( int c, TQPainter *pt, TQPDevCmdParam *p )
 			}
 		}
 		break;
-#if 0
-#ifndef QT_NO_TRANSFORMATIONS
 	    case PdcSaveWMatrix:
-		painter->saveWorldMatrix();
+		if (p) {
+			const TQWMatrix* tqt3matrix = p[0].matrix;
+			m_worldMatrixStack.push(new TQWMatrix(*tqt3matrix));
+		}
 		break;
 	    case PdcRestoreWMatrix:
-		painter->restoreWorldMatrix();
+		if (p) {
+			if (!m_worldMatrixStack.isEmpty()) {
+				TQWMatrix* matrix = m_worldMatrixStack.pop();
+
+				// Set world matrix
+				TQPDevCmdParam param[2];
+				int command = PdcSetWMatrix;
+				param[0].matrix = matrix;
+				param[1].ival = 0;
+				cmd(command, pt, param);
+
+				delete matrix;
+			}
+		}
 		break;
-#endif
-#endif
 	    case PdcSetClip:
 		if ((p) && (m_painter)) {
 			m_clipRegionEnabled = p[0].ival;
diff --git a/tdegtk/tqtcairopainter.h b/tdegtk/tqtcairopainter.h
index 9332128..d04e9a4 100644
--- a/tdegtk/tqtcairopainter.h
+++ b/tdegtk/tqtcairopainter.h
@@ -29,11 +29,14 @@
 #include "ntqbrush.h"
 #include "ntqfont.h"
 #include "ntqimage.h"
+#include "ntqptrstack.h"
 #include "ntqpainter.h"
 
 #include <cairo.h>
 #include <pango/pangocairo.h>
 
+typedef TQPtrStack<TQWMatrix> TQWMatrixStack;
+
 class Q_EXPORT TQt3CairoPaintDevice : public TQPaintDevice		// picture class
 {
 	public:
@@ -85,6 +88,8 @@ class Q_EXPORT TQt3CairoPaintDevice : public TQPaintDevice		// picture class
 		TQFont m_font;
 		TQImage m_clipRegion;
 		bool m_clipRegionEnabled;
+
+		TQWMatrixStack m_worldMatrixStack;
 };
 
 #endif // TDEQT4PAINTER_H