diff -r 000000000000 -r 4e91876724a2 photosgallery/slideshow/utils/shwgeometryutilities.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/photosgallery/slideshow/utils/shwgeometryutilities.h	Thu Dec 17 08:45:44 2009 +0200
@@ -0,0 +1,118 @@
+/*
+* Copyright (c) 2007-2008 Nokia Corporation and/or its subsidiary(-ies). 
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description:    Thin callback wrapper
+ *
+*/
+
+
+
+
+// include guard for the whole file content
+#ifndef __SHWGEOMETRYUTILITIES_H__
+#define __SHWGEOMETRYUTILITIES_H__
+
+namespace NShwGeometryUtilities
+    {
+    /**
+     * Utility to calculate the fitting for coordinates and maintaining the 
+     * aspect ratio
+     * @param aFitted reference to second coordinate, this value gets 
+     *          multiplied with aNewAssigned / aAssigned
+     * @param aAssigned reference to first coordinate, this value gets 
+     *          assigned to aNewAssigned
+     * @param aNewAssigned new value for first coordinate
+     * 
+     * Example: X coordinate needs to be assigned a new value X2 and you need
+     * to calculate new Y coordinate maintaining the aspect ratio:
+     * FitDimension( Y, X, X2 );
+     * 
+     * @author Kimmo Hoikka
+     */
+    template< typename T>
+    void FitDimension( T& aFitted, T& aAssigned, T aNewAssigned )
+        {
+        // formula is:
+        // aFitted = ( aFitted *  aNewAssigned ) / aAssigned
+        // aAssigned = aNewAssigned
+        // calculate second coordinate
+        aFitted =
+            ( aFitted * aNewAssigned ) /
+                aAssigned;
+        // assign the first coordinate
+        aAssigned = aNewAssigned;
+        }
+
+    /**
+     * Utility to fit width and height inside given box
+     * maintaining the aspect ratio. Fit inside means that the image
+     * does not fill the whole box and it is not stretched.
+     * @param aWidth reference to the width to fit
+     * @param aHeight reference to the height to fit
+     * @param aBoxWidth the bounding box width
+     * @param aBoxHeight the bounding box height
+     */
+    template< typename T>
+    void FitInsideBox( T& aWidth, T& aHeight, T aBoxWidth, T aBoxHeight )
+        {
+        // calculate width difference
+        T wdiff = aWidth - aBoxWidth;
+        // calculate height difference
+        T hdiff = aHeight - aBoxHeight;
+        // check if wdiff is larger and positive
+        if( ( wdiff > hdiff ) && wdiff > 0 )
+            {
+            // width is larger and too big for box so need to fit height
+            FitDimension( aHeight, aWidth, aBoxWidth );
+            }
+        else if( hdiff > 0 )
+            {
+            // height is larger and too big for box so need to fit width
+            FitDimension( aWidth, aHeight, aBoxHeight );
+            }
+        }
+
+    /**
+     * Utility to set width and height to cover given box
+     * maintaining the aspect ratio. Fit cover means that the image
+     * fills the whole box and some part of it does not fit inside the box.
+     * @param aWidth reference to the width to fit
+     * @param aHeight reference to the height to fit
+     * @param aBoxWidth the bounding box width
+     * @param aBoxHeight the bounding box height
+     */
+    template< typename T>
+    void FitToCoverBox( T& aWidth, T& aHeight, T aBoxWidth, T aBoxHeight )
+        {
+        // try to fit with width first
+        T newWidth = aWidth;
+        T newHeight = aHeight;
+        // calculate new height according to the width change
+        FitDimension( newHeight, newWidth, aBoxWidth );
+        // check if height is inside box
+        if( newHeight < aBoxHeight )
+            {
+            // ok, it did not fill so fit according to height
+            FitDimension( aWidth, aHeight, aBoxHeight );
+            }
+        else
+            {
+            // did fill the image so assign new values
+            aWidth = newWidth;
+            aHeight = newHeight;
+            }
+        }
+    }
+ 
+
+#endif // __SHWGEOMETRYUTILITIES_H__