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