// Copyright (c) 1998-2009 Nokia Corporation and/or its subsidiary(-ies).+
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// All rights reserved.+
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// This component and the accompanying materials are made available+
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// under the terms of "Eclipse Public License v1.0"+
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// which accompanies this distribution, and is available+
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".+
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//+
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// Initial Contributors:+
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// Nokia Corporation - initial contribution.+
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//+
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// Contributors:+
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//+
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// Description:+
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//+
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+
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#include <gdi.h>+
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#include "GDIPANIC.h"+
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+
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//+
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// CPalette+
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//+
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+
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_LIT(KGdiCPalettePanicCategory,"CPalette");+
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+
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EXPORT_C CPalette::CPalette():+
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	CBase(),+
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	iArray(NULL),+
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	iNumEntries(0)+
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	{}+
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+
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+
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EXPORT_C CPalette::~CPalette()+
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/** Destructor. */+
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	{+
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	delete [] iArray;+
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	}+
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+
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+
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EXPORT_C void CPalette::Clear()+
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/** Clears all the entries in the palette to TRgb(0). */+
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	{+
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	TRgb blank(0);+
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	for(TInt count=0;count<iNumEntries;count++)+
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		iArray[count]=blank;+
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	}+
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+
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+
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EXPORT_C CPalette* CPalette::NewL(TInt aNumberOfEntries)+
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/** Creates a new palette with the specified number of entries. +
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+
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@param aNumberOfEntries The number of entries in the palette being created.+
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@return The newly created palette. */+
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	{+
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	CPalette* thisptr=new(ELeave) CPalette;+
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	CleanupStack::PushL(thisptr);+
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	thisptr->ConstructL(aNumberOfEntries);+
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	CleanupStack::Pop();+
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	return(thisptr);+
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	}+
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+
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+
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EXPORT_C CPalette* CPalette::NewDefaultL(TDisplayMode aDispMode)+
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/** Creates a new default palette for the specified display mode. The default palette +
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for a particular display mode has one entry for each possible colour in that +
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display mode (2 entries for EGray2, 16 entries for EColor16 etc.); the colour +
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of each index p in the default palette is set to its default value according +
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to its display mode (e.g. if the mode is EColor16 then palette[p]==TRgb::Color16(p); +
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if the mode is EGray4 then palette[p]==TRgb::_Gray4(p)). +
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+
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@param aDispMode The display mode for which the palette is to be created. +
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@return The newly created palette */+
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	{+
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	TInt numentries=0;+
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	switch(aDispMode)+
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		{+
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	case EGray2:+
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		numentries=2;+
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		break;+
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	case EGray4:+
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		numentries=4;+
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		break;+
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	case EGray16:+
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	case EColor16:+
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		numentries=16;+
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		break;+
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	case EGray256:+
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	case EColor256:+
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		numentries=256;+
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		break;+
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	default:+
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		User::Leave(KErrNotSupported);+
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		};+
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	CPalette* thisptr=new(ELeave) CPalette;+
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	CleanupStack::PushL(thisptr);+
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	thisptr->ConstructL(numentries);+
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	TInt count=0;+
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	switch(aDispMode)+
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		{+
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	case EGray2:+
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		thisptr->iArray[0]=TRgb::_Gray2(0);+
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		thisptr->iArray[1]=TRgb::_Gray2(1);+
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		break;+
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	case EGray4:+
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		for(;count<numentries;count++)+
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			thisptr->iArray[count]=TRgb::_Gray4(count);+
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		break;+
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	case EGray16:+
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		for(;count<numentries;count++)+
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			thisptr->iArray[count]=TRgb::_Gray16(count);+
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		break;+
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	case EColor16:+
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		for(;count<numentries;count++)+
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			thisptr->iArray[count]=TRgb::Color16(count);+
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		break;+
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	case EGray256:+
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		for(;count<numentries;count++)+
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			thisptr->iArray[count]=TRgb::_Gray256(count);+
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		break;+
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	case EColor256:+
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		for(;count<numentries;count++)+
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			thisptr->iArray[count]=TRgb::Color256(count);+
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		break;+
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	default:+
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		User::Leave(KErrNotSupported);+
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		}+
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	CleanupStack::Pop();+
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	return(thisptr);+
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	}+
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+
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void CPalette::ConstructL(TInt aNumberOfEntries)+
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	{+
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	if(aNumberOfEntries<=0) User::Leave(KErrArgument);+
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	iArray=new(ELeave) TRgb[aNumberOfEntries];+
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	iNumEntries=aNumberOfEntries;+
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	}+
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+
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+
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EXPORT_C TRgb CPalette::GetEntry(TInt aIndex) const+
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/** Gets the RGB value of the palette entry at aPaletteIndex.+
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	+
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@param aPaletteIndex The index of the palette entry to get. +
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@return The RGB value of the palette entry */+
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	{+
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	GDI_ASSERT_ALWAYS_GENERAL(aIndex<iNumEntries,User::Panic(KGdiCPalettePanicCategory,KErrTooBig));+
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	if(aIndex<iNumEntries)+
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		return(iArray[aIndex]);+
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	TRgb defaultcol(0,0,0);+
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	return(defaultcol);+
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	}+
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+
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+
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EXPORT_C TRgb CPalette::NearestEntry(const TRgb& aColor) const+
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/** Gets the colour in the palette which is closest to the specified colour.+
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+
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@param aColor The colour to find.+
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@return The colour in the palette which is closest to the specified colour. */+
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	{+
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	return(iArray[NearestIndex(aColor)]);+
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	}+
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+
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+
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EXPORT_C TInt CPalette::NearestIndex(const TRgb& aColor) const+
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/** Gets the index of the colour in the palette which is closest to the specified +
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colour.+
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+
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@param aColor The colour to find.+
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@return The index of the colour in the palette which is closest to the specified +
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colour. */+
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	{+
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	TRgb* entry = iArray;+
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	TRgb* entryLimit = entry+iNumEntries;+
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	TRgb* lowest = entry;+
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	TInt mindif = KMaxTInt;+
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+
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	while(entry<entryLimit)+
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		{+
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		TInt value = entry->Internal();+
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+
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		TInt difference = Abs((TInt)(aColor.Internal()&0xFF)-(TInt)(value&0xFF))++
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						  (Abs((TInt)(aColor.Internal()&0xFF00)-(TInt)(value&0xFF00))>>8)++
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						  (Abs((TInt)(aColor.Internal()&0xFF0000)-(TInt)(value&0xFF0000))>>16);+
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+
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		if(difference<mindif)+
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			{+
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			lowest=entry;+
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			mindif=difference;+
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			if(difference==0)+
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				break;+
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			}+
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		entry++;+
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		}+
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	return(lowest-iArray);+
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	}+
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+
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+
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EXPORT_C void CPalette::SetEntry(TInt aIndex,const TRgb& aColor)+
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/** Sets the palette entry at aPaletteIndex to the RGB value aPaletteEntry.+
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	+
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@param aPaletteIndex The index of the palette entry to be set.+
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@param aPaletteEntry The RGB value to set that entry to. */+
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	{+
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	GDI_ASSERT_ALWAYS_GENERAL(aIndex<iNumEntries,User::Panic(KGdiCPalettePanicCategory,KErrTooBig));+
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	iArray[aIndex]=aColor;+
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	}+
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+
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+
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EXPORT_C void CPalette::GetDataPtr(TInt aFirstColor,TInt aNumColors,TPtr8& aPtr)+
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/** Returns a descriptor over the palette entries for the specifed colors. It is +
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designed so that the descriptor can be passed to another thread and that thread +
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copy the relevant entries.+
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+
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@param aFirstColor The first colour.+
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@param aNumColors Number of colours.+
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@param aPtr Descriptor. */+
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	{+
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	TInt size=sizeof(TRgb)*aNumColors;+
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	aPtr.Set(REINTERPRET_CAST(TUint8*,&iArray[aFirstColor]),size,size);+
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	}+
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