// 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 <e32base.h>

#include <bitmap.h>

#include "CompressionBookmark.h"

#include "BitmapCompr.h"

#include "UTILS.H"

#include "bitmapconst.h"

GLREF_C void Panic(TFbsPanic aPanic);

/**

The method recalculates aLineScanPos which is used for quick search of the

nearest "length" byte before aStartPos.

Note: The method should be used only for compressed in RAM bitmaps for which

iPile != NULL.

@internalComponent

@post aLineScanPos might be updated

*/

GLDEF_C void AdjustLineScanningPosition(TLineScanningPosition& aLineScanPos, 

										const TUint32* aBase, 

										TInt aBitmapWidth, 

										TInt aStartPos,

										TInt aCompressedDataBytes)

	{

	TInt difference = ::Abs(aStartPos - aLineScanPos.iCursorPos);

	if(difference > aBitmapWidth && aCompressedDataBytes > KCompressionBookMarkThreshold)

		{

		const TCompressionBookMark* bookMarkPtr = 

			(const TCompressionBookMark*)((const TUint8*)aBase + 

										  (aCompressedDataBytes + 3) / 4 * 4 + 4);

		if(bookMarkPtr->iSrcDataOffset && bookMarkPtr->IsCheckSumOk())

			{

			TInt difference2 = ::Abs(aStartPos - bookMarkPtr->iCursorPos);

			if(difference2 < difference)

				{

				aLineScanPos.iCursorPos = bookMarkPtr->iCursorPos;

				aLineScanPos.iSrcDataPtr = ((TUint8*)aBase) + bookMarkPtr->iSrcDataOffset;

				}

			}

		}

	}

/**

The method gets the first 16 bpp pixel value pointed by aSrcPtr and copies it aCount times

to aDestPtr buffer.

@internalComponent

@pre aCount > 0

@param aSrcPtr It points to the source pixel

@param aDestPtr It points to the destination buffer where the pixel should be copied aCount times

@param aCount How many times the pixel value should be copied

@return The updated aDestPtr

*/

template <> 

TUint8* TScanLineDecompressor<E2bpp, E2bpp>::CopyPixel(TUint8* aDestPtr, 

												 const TUint8* aSrcPtr, 

												 TInt aCount) const

	{

	//We can't access directly the 16 bits data chunk, because it may be located at an odd address and

	//THUMB build will fail with "KERNEL EXEC-3".

	TUint8 lsb = *aSrcPtr;

	TUint8 msb = *(aSrcPtr + 1);

	TUint16 data = TUint16(lsb | (TUint16(msb) << 8));

	TUint32 data32 = TUint32(data | (TUint32(data) << 16));

	if((TUint32(aDestPtr) & 0x2) && aCount)

		{

		*(TUint16*)aDestPtr = data;

		aDestPtr += 2;//+= 2 - the pixel color is coded into 16 bits - 2 bytes

		aCount--;

		}

	while(aCount > 1)

		{

		*(TUint32*)aDestPtr = data32;

		aDestPtr += 4;//+= 4 - the pixel color is coded into 16 bits - 2 x 2 bytes

		aCount -= 2;

		}

	if(aCount)

		{

		*(TUint16*)aDestPtr = data;

		aDestPtr += 2;//+= 2 - the pixel color is coded into 16 bits - 2 bytes

		}

	return aDestPtr;

	}

/**

The method gets the first 24 bpp pixel value pointed by aSrcPtr and copies it aCount times

to aDestPtr buffer.

@internalComponent

@pre aCount > 0

@param aSrcPtr It points to the source pixel

@param aDestPtr It points to the destination buffer where the pixel should be copied aCount times

@param aCount How many times the pixel value should be copied

@return The updated aDestPtr

*/

template <> 

TUint8* TScanLineDecompressor<E3bpp, E3bpp>::CopyPixel(TUint8* aDestPtr, 

												 const TUint8* aSrcPtr, 

												 TInt aCount) const

	{

	const TUint8 b1 = *aSrcPtr;

	const TUint8 b2 = *(aSrcPtr + 1);

	const TUint8 b3 = *(aSrcPtr + 2);

	while(aCount--)

		{

		*aDestPtr++ = b1;

		*aDestPtr++ = b2;

		*aDestPtr++ = b3;

		}

	return aDestPtr;

	}

/**

The method gets the first 32 bpp pixel value pointed by aSrcPtr and copies it aCount times

to aDestPtr buffer.

@internalComponent

@pre aCount > 0

@param aSrcPtr It points to the source pixel

@param aDestPtr It points to the destination buffer where the pixel should be copied aCount times

@param aCount How many times the pixel value should be copied

@return The updated aDestPtr

*/

template <> 

TUint8* TScanLineDecompressor<E4bpp, E4bpp>::CopyPixel(TUint8* aDestPtr, 

												 const TUint8* aSrcPtr, 

												 TInt aCount) const

	{

	__ASSERT_DEBUG((reinterpret_cast<TUint32>(aDestPtr) & 0x3)==0,Panic(EFbsBitmapDecompressionError)); // make sure the start address is word aligned

	const TUint8 b1 = *aSrcPtr;

	const TUint8 b2 = *(aSrcPtr + 1);

	const TUint8 b3 = *(aSrcPtr + 2);

	const TUint8 b4 = *(aSrcPtr + 3);

	if((reinterpret_cast<TUint32>(aDestPtr) & 0x3)== 0)	// the start address is word aligned

		{

		const TUint32 pixel = (b4 << 24) | (b3 << 16) | (b2 << 8) | b1;

		TUint32* destPtr32 = reinterpret_cast <TUint32*>(aDestPtr);

		TInt blocksOf16 = ((aCount + 0x0f) >> 4);	// number of blocks of upto 16 words to write

		// the first iteration writes 1 to 15 words

		switch (aCount & 0x0f)

			{ // note that case statements intentionally cascade

		case 0:

			do {	// second and subsequent iterations always write 16 words

			*destPtr32++ = pixel;

		case 15:

			*destPtr32++ = pixel;

		case 14:

			*destPtr32++ = pixel;

		case 13:

			*destPtr32++ = pixel;

		case 12:

			*destPtr32++ = pixel;

		case 11:

			*destPtr32++ = pixel;

		case 10:

			*destPtr32++ = pixel;

		case 9:

			*destPtr32++ = pixel;

		case 8:

			*destPtr32++ = pixel;

		case 7:

			*destPtr32++ = pixel;

		case 6:

			*destPtr32++ = pixel;

		case 5:

			*destPtr32++ = pixel;

		case 4:

			*destPtr32++ = pixel;

		case 3:

			*destPtr32++ = pixel;

		case 2:

			*destPtr32++ = pixel;

		case 1:

			*destPtr32++ = pixel;

			} while(--blocksOf16 > 0);

			}

		return reinterpret_cast <TUint8*>(destPtr32);

		}

	while(aCount--)

		{

		*aDestPtr++ = b1;

		*aDestPtr++ = b2;

		*aDestPtr++ = b3;

		*aDestPtr++ = b4;

		}

	return aDestPtr;

	}

/**

The method gets the first 24 bpp pixel value pointed by aSrcPtr and copies it aCount times

to aDestPtr 32 bpp buffer.

@internalComponent

@pre aCount > 0

@param aSrcPtr It points to the source pixel

@param aDestPtr It points to the destination buffer where the pixel should be copied aCount times

@param aCount How many times the pixel value should be copied

@return The updated aDestPtr

*/

template <> 

TUint8* TScanLineDecompressor<E3bpp, E4bpp>::CopyPixel(TUint8* aDestPtr, 

												 const TUint8* aSrcPtr, 

												 TInt aCount) const

	{

	const TUint8 b1 = *aSrcPtr;

	const TUint8 b2 = *(aSrcPtr + 1);

	const TUint8 b3 = *(aSrcPtr + 2);

	if((reinterpret_cast<TUint32>(aDestPtr) & 0x3)== 0)	// the start address is word aligned

		{

		const TUint32 pixel = 0xFF000000 | (b3 << 16) | (b2 << 8) | b1; //it is more accurate to equalize to 0xff, 

																		 //as top byte could correspond an alpha channel

		TUint32* destPtr32 = reinterpret_cast <TUint32*>(aDestPtr);

		TInt blocksOf16 = ((aCount + 0x0f) >> 4);	// number of blocks of upto 16 words to write

		// the first iteration writes 1 to 15 words

		switch (aCount & 0x0f)

			{ // note that case statements intentionally cascade

		case 0:

			do {	// second and subsequent iterations always write 16 words

			*destPtr32++ = pixel;

		case 15:

			*destPtr32++ = pixel;

		case 14:

			*destPtr32++ = pixel;

		case 13:

			*destPtr32++ = pixel;

		case 12:

			*destPtr32++ = pixel;

		case 11:

			*destPtr32++ = pixel;

		case 10:

			*destPtr32++ = pixel;

		case 9:

			*destPtr32++ = pixel;

		case 8:

			*destPtr32++ = pixel;

		case 7:

			*destPtr32++ = pixel;

		case 6:

			*destPtr32++ = pixel;

		case 5:

			*destPtr32++ = pixel;

		case 4:

			*destPtr32++ = pixel;

		case 3:

			*destPtr32++ = pixel;

		case 2:

			*destPtr32++ = pixel;

		case 1:

			*destPtr32++ = pixel;

			} while(--blocksOf16 > 0);

			}

		return reinterpret_cast <TUint8*>(destPtr32);

		}

	while(aCount--)

		{

		*aDestPtr++ = b1;

		*aDestPtr++ = b2;

		*aDestPtr++ = b3;

		*aDestPtr++ = 0xff; //it is more accurate to equalize to 0xff, as top byte 

									//could correspond an alpha channel

		}

	return aDestPtr;

	}

/**

The method gets the 24 bpp pixel value pointed by aSrcPtr and copies it aCount times

to aDestPtr 32 bpp buffer.

@internalComponent

@pre aCount > 0

@param aSrcPtr It points to the source pixel

@param aDestPtr It points to the destination buffer where the pixel should be copied aCount times

@param aCount How many times the pixel value should be copied

@return The updated aDestPtr

*/

template <> 

TUint8* TScanLineDecompressor<E3bpp, E4bpp>::CopyBlockPixel(TUint8* aDestPtr, 

												 const TUint8* aSrcPtr, 

												 TInt aCount) const

	{

	while(aCount--)

		{

		*aDestPtr++ = *aSrcPtr++;

		*aDestPtr++ = *aSrcPtr++;

		*aDestPtr++ = *aSrcPtr++;

		*aDestPtr++ = 0xff; //it is more accurate to equalize to 0xff, as top byte 

									//could correspond an alpha channel

		}

	return aDestPtr;

	}

/**

The method should never be executed.

Introduced to prevent CCover compiler from failing.

@internalComponent

@return The unchanged aDestPtr

*/

template <> 

TUint8* TScanLineDecompressor<E2bpp, E2bpp>::CopyBlockPixel(TUint8* aDestPtr, 

												 const TUint8* /*aSrcPtr*/, 

												 TInt /*aCount*/) const

	{

	return aDestPtr;

	}

/**

The method should never be executed.

Introduced to prevent CCover compiler from failing.

@internalComponent

@return The unchanged aDestPtr

*/

template <> 

TUint8* TScanLineDecompressor<E3bpp, E3bpp>::CopyBlockPixel(TUint8* aDestPtr, 

												 const TUint8* /*aSrcPtr*/, 

												 TInt /*aCount*/) const

	{

	return aDestPtr;

	}

/**

The method should never be executed.

Introduced to prevent CCover compiler from failing.

@internalComponent

@return The unchanged aDestPtr

*/

template <> 

TUint8* TScanLineDecompressor<E4bpp, E4bpp>::CopyBlockPixel(TUint8* aDestPtr, 

												 const TUint8* /*aSrcPtr*/, 

												 TInt /*aCount*/) const

	{

	return aDestPtr;

	}