--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graphicsdeviceinterface/gdi/sgdi/ZOOMFAC.CPP	Tue Feb 02 01:47:50 2010 +0200
@@ -0,0 +1,205 @@
+// Copyright (c) 2003-2009 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:
+//
+
+#include <gdi.h>
+#include "GDIPANIC.h"
+
+_LIT(KGdiTZoomFactorPanicCategory,"TZoomFactor");
+
+//
+// TZoomFactor
+//
+
+ 
+EXPORT_C TZoomFactor::TZoomFactor():
+	iZoomFactor(EZoomOneToOne),
+	iDevice(NULL)
+/** Constructs a default zoom factor object.
+
+Note that a TZoomFactor object cannot be used until a CGraphicsDevice to which 
+it is associated is specified (by SetGraphicsDeviceMap()). Therefore the other 
+constructor is normally used for constructing TZoomFactors. The default constructor 
+function is provided for use in TZoomFactor-derived classes. */
+	{}
+
+ 
+EXPORT_C TZoomFactor::~TZoomFactor()
+/** Destructor.
+
+Frees resources owned by the object, prior to its destruction. */
+	{}
+
+ 
+EXPORT_C TInt TZoomFactor::ZoomFactor() const
+/** Gets the zoom factor.
+
+@return The zoom factor */
+	{
+	return iZoomFactor;
+	}
+
+ 
+EXPORT_C void TZoomFactor::SetZoomFactor(TInt aZoomFactor)
+/** Sets the zoom factor.
+
+@param aZoomFactor The desired zoom factor. */
+	{
+	iZoomFactor=aZoomFactor;
+	}
+
+ 
+EXPORT_C void TZoomFactor::SetTwipToPixelMapping(const TSize& aSizeInPixels,const TSize& aSizeInTwips)
+// Ensure that aSizeInTwips fits inside aSizeInPixels when zoomed
+/** Sets the twips to pixels mapping for the graphics device with which the zoom 
+factor is associated.
+
+This setting is used by all the twips to pixels and pixels to twips conversion 
+functions.
+
+@param aSizeInPixels The size of the graphics device area in pixels. 
+@param aSizeInTwips The size of the graphics device area in twips. */
+	{
+	GDI_ASSERT_ALWAYS_GENERAL(iDevice!=NULL,User::Panic(KGdiTZoomFactorPanicCategory,KErrNotFound));
+	TInt devicepixelwidth=iDevice->HorizontalTwipsToPixels(aSizeInTwips.iWidth);
+	TInt devicepixelheight=iDevice->VerticalTwipsToPixels(aSizeInTwips.iHeight);
+	if(devicepixelwidth==0 || devicepixelheight==0)
+		{
+		iZoomFactor=0;
+		return;
+		}
+	iZoomFactor = (1000*aSizeInPixels.iWidth+(devicepixelwidth/2))/devicepixelwidth;
+	TInt temp = (1000*aSizeInPixels.iHeight+(devicepixelheight/2))/devicepixelheight;
+	if (temp<iZoomFactor)
+		iZoomFactor = temp;
+	}
+
+EXPORT_C TInt TZoomFactor::HorizontalTwipsToPixels(TInt aTwipWidth) const
+/** Converts a horizontal dimension from twips to pixels on the graphics
+device.
+
+This function implements the pure virtual function defined in
+MGraphicsDeviceMap::HorizontalTwipsToPixels() */
+	{
+	// iZoomFactor expressed in units of a thousandth
+	// delegated conversion is done 8 times multiplied for 3 guard bits
+	// hence result divided by 8
+	GDI_ASSERT_ALWAYS_GENERAL(iDevice!=NULL,User::Panic(KGdiTZoomFactorPanicCategory,KErrNotFound));
+	return (iDevice->HorizontalTwipsToPixels(((aTwipWidth*iZoomFactor)/125))+((aTwipWidth<0)?-4:4))/8;
+	}
+
+
+EXPORT_C TInt TZoomFactor::VerticalTwipsToPixels(TInt aTwipHeight) const
+/** Converts a vertical dimension from twips to pixels on the graphics
+device.
+
+This function implements the pure virtual function defined in
+MGraphicsDeviceMap::VerticalTwipsToPixels() */	
+	{
+	GDI_ASSERT_ALWAYS_GENERAL(iDevice!=NULL,User::Panic(KGdiTZoomFactorPanicCategory,KErrNotFound));
+	return (iDevice->VerticalTwipsToPixels(((aTwipHeight*iZoomFactor)/125))+((aTwipHeight<0)?-4:4))/8;
+	}
+
+
+EXPORT_C TInt TZoomFactor::HorizontalPixelsToTwips(TInt aPixelWidth) const 
+/** Converts a horizontal dimension from pixels to twips on the graphics
+device.
+
+This function implements the pure virtual function defined in
+MGraphicsDeviceMap::HorizontalPixelsToTwips() */	
+	{
+	GDI_ASSERT_ALWAYS_GENERAL(iDevice!=NULL,User::Panic(KGdiTZoomFactorPanicCategory,KErrNotFound));
+	TInt temp = iDevice->HorizontalPixelsToTwips(aPixelWidth*8)*1000;
+	temp+=(temp<0)?-(iZoomFactor*4):iZoomFactor*4;
+	TInt eightTimesZoom=iZoomFactor*8;
+	if(eightTimesZoom)
+		return temp/eightTimesZoom;
+	return(0);
+	}
+
+EXPORT_C TInt TZoomFactor::VerticalPixelsToTwips(TInt aPixelHeight) const
+/**  Converts a vertical dimension from pixels to twips on the graphics
+device.
+
+This function implements the pure virtual function defined in
+MGraphicsDeviceMap::VerticalPixelsToTwips() */	
+	{
+	GDI_ASSERT_ALWAYS_GENERAL(iDevice!=NULL,User::Panic(KGdiTZoomFactorPanicCategory,KErrNotFound));
+	TInt temp = iDevice->VerticalPixelsToTwips(aPixelHeight*8)*1000;
+	temp+=(temp<0)?-(iZoomFactor*4):iZoomFactor*4;
+	TInt eightTimesZoom=iZoomFactor*8;
+	if(eightTimesZoom)
+		return temp/eightTimesZoom;
+	return(0);
+	}
+
+/**
+@publishedAll
+*/
+EXPORT_C TInt TZoomFactor::GetNearestFontInTwips(CFont*& aFont, const TFontSpec& aFontSpec)
+	{
+	return GetNearestFontToDesignHeightInTwips(aFont, aFontSpec);
+	}
+
+/**
+Gets the font which is the nearest to the given font specification.
+Matching to design height gives no guarantees on the actual physical size of the font.
+
+@param aFont On return, contains a pointer to the nearest font.
+@param aFontSpec The specification of the font to be matched.
+@return KErrNone if successful; a system-wide error code otherwise.
+@publishedAll
+@released
+*/
+EXPORT_C TInt TZoomFactor::GetNearestFontToDesignHeightInTwips(CFont*& aFont, const TFontSpec& aFontSpec)
+	{
+	GDI_ASSERT_ALWAYS_GENERAL(iDevice, User::Panic(KGdiTZoomFactorPanicCategory, KErrNotFound));
+	TFontSpec fontSpec = aFontSpec;
+	fontSpec.iHeight = (fontSpec.iHeight * iZoomFactor + EZoomOneToOne / 2) / EZoomOneToOne;
+	return (const_cast<MGraphicsDeviceMap*>(iDevice))->GetNearestFontToDesignHeightInTwips(aFont, fontSpec);
+	}
+
+/**
+Gets the font which is the nearest to the given font specification.
+Matching to maximum height returns a font that will fit within the height specified.
+
+@param aFont On return, contains a pointer to the nearest font.
+@param aFontSpec The specification of the font to be matched.
+@param aMaxHeight The maximum height within which the font must fit.
+This overrides the height specified in aFontSpec. If maximum height
+is greater than 1024 pixels, the function returns KErrTooBig. And 
+returns KErrArgument if equals to 1 pixel.
+@return KErrNone if successful; a system-wide error code otherwise.
+@publishedAll
+@released
+*/
+EXPORT_C TInt TZoomFactor::GetNearestFontToMaxHeightInTwips(CFont*& aFont, const TFontSpec& aFontSpec, TInt aMaxHeight)
+	{
+	GDI_ASSERT_ALWAYS_GENERAL(iDevice, User::Panic(KGdiTZoomFactorPanicCategory, KErrNotFound));
+	TFontSpec fontSpec = aFontSpec;
+	fontSpec.iHeight = (fontSpec.iHeight * iZoomFactor + EZoomOneToOne / 2) / EZoomOneToOne;
+	aMaxHeight = (aMaxHeight * iZoomFactor + EZoomOneToOne / 2) / EZoomOneToOne;
+	return (const_cast<MGraphicsDeviceMap*>(iDevice))->GetNearestFontToMaxHeightInTwips(aFont, fontSpec, aMaxHeight);
+	}
+
+/** Releases the specified font.
+
+This function implements the pure virtual function defined in
+MGraphicsDeviceMap::ReleaseFont() 
+@param aFont A pointer to the font to be released. */	
+EXPORT_C void TZoomFactor::ReleaseFont(CFont* aFont)
+	{
+	GDI_ASSERT_ALWAYS_GENERAL(iDevice != NULL, User::Panic(KGdiTZoomFactorPanicCategory, KErrNotFound));
+	((MGraphicsDeviceMap*)iDevice)->ReleaseFont(aFont);
+	}