1 // Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies).

     2 // All rights reserved.

     3 // This component and the accompanying materials are made available

     4 // under the terms of "Eclipse Public License v1.0"

     5 // which accompanies this distribution, and is available

     6 // at the URL "http://www.eclipse.org/legal/epl-v10.html".

     7 //

     8 // Initial Contributors:

     9 // Nokia Corporation - initial contribution.

    10 //

    11 // Contributors:

    12 //

    13 // Description:

    14 //

    15 

    16 #include <graphics/lookuptable.h>

    17 #include <graphics/blendingalgorithms.h>

    18 

    19 #include "pixelutil.h"

    20 #include "directgdiadapter.h"

    21 #include "directgditypes.h"

    22 

    23 TBool PixelFormatUtil::HasAlpha(TUidPixelFormat aPixelFormat)

    24 	{

    25 	const TBool hasAlpha = 

    26 		// short circuit format equivalent to legacy TDisplayMode with alpha channel

    27 		aPixelFormat == EUidPixelFormatARGB_8888 ||

    28 		aPixelFormat == EUidPixelFormatARGB_8888_PRE ||

    29 

    30 		aPixelFormat == EUidPixelFormatBGRA_8888 ||

    31 		aPixelFormat == EUidPixelFormatABGR_8888 ||

    32 		aPixelFormat == EUidPixelFormatABGR_8888_PRE ||

    33 		aPixelFormat == EUidPixelFormatBGRA_8888_PRE ||

    34 		aPixelFormat == EUidPixelFormatARGB_2101010 ||

    35 		aPixelFormat == EUidPixelFormatABGR_2101010 ||

    36 		aPixelFormat == EUidPixelFormatARGB_1555 ||

    37 		aPixelFormat == EUidPixelFormatARGB_4444 ||

    38 		aPixelFormat == EUidPixelFormatARGB_8332 ||

    39 		aPixelFormat == EUidPixelFormatBGRA_5551 ||

    40 		aPixelFormat == EUidPixelFormatBGRA_4444 ||

    41 		aPixelFormat == EUidPixelFormatAP_88 ||

    42 		aPixelFormat == EUidPixelFormatA_8;

    43 	

    44 	return hasAlpha;

    45 	}

    46 

    47 TUidPixelFormat PixelFormatUtil::ConvertToPixelFormat(TDisplayMode aDisplayMode)

    48 	{

    49 	switch (aDisplayMode)

    50 		{

    51 		case EGray2:

    52 			return EUidPixelFormatL_1;

    53 		case EGray4:

    54 			return EUidPixelFormatL_2;

    55 		case EGray16:

    56 			return EUidPixelFormatL_4;

    57 		case EGray256:

    58 			return EUidPixelFormatL_8;

    59 		case EColor16:

    60 			return EUidPixelFormatP_4;

    61 		case EColor256:

    62 			return EUidPixelFormatP_8;

    63 		case EColor4K:

    64 			return EUidPixelFormatXRGB_4444;

    65 		case EColor64K:

    66 			return EUidPixelFormatRGB_565;

    67 		case EColor16M:

    68 			return EUidPixelFormatRGB_888;		

    69 		case EColor16MU:

    70 			return EUidPixelFormatXRGB_8888;

    71 		case EColor16MA:

    72 			return EUidPixelFormatARGB_8888;

    73 		case EColor16MAP:

    74 			return EUidPixelFormatARGB_8888_PRE;

    75 		default:

    76 			return EUidPixelFormatUnknown;

    77 		};	

    78 	}

    79 

    80 TDisplayMode PixelFormatUtil::ConvertToDisplayMode(TUidPixelFormat aPixelFormat)

    81 	{

    82 	switch (aPixelFormat)	

    83 		{

    84 		case EUidPixelFormatL_1:

    85 			return EGray2;

    86 		case EUidPixelFormatL_2:

    87 			return EGray4;

    88 		case EUidPixelFormatL_4:

    89 			return EGray16;

    90 		case EUidPixelFormatL_8:

    91 			return EGray256;

    92 		case EUidPixelFormatP_4:

    93 			return EColor16;

    94 		case EUidPixelFormatP_8:

    95 			return EColor256;

    96 		case EUidPixelFormatXRGB_4444:

    97 			return EColor4K;

    98 		case EUidPixelFormatRGB_565:

    99 			return EColor64K;

   100 		case EUidPixelFormatRGB_888:

   101 			return EColor16M;

   102 		case EUidPixelFormatXRGB_8888:

   103 			return EColor16MU;

   104 		case EUidPixelFormatARGB_8888:

   105 			return EColor16MA;

   106 		case EUidPixelFormatARGB_8888_PRE:

   107 			return EColor16MAP;

   108 		default:

   109 			return ENone;

   110 		}

   111 	}

   112 

   113 TInt PixelFormatUtil::BitsPerPixel(TUidPixelFormat aPixelFormat)

   114 	{

   115 	switch (aPixelFormat)

   116 		{

   117 		case EUidPixelFormatP_1:

   118 		case EUidPixelFormatL_1:

   119 			return 1;

   120 		case EUidPixelFormatP_2:

   121 		case EUidPixelFormatL_2:

   122 			return 2;

   123 		case EUidPixelFormatP_4:

   124 		case EUidPixelFormatL_4:

   125 			return 4;

   126 		case EUidPixelFormatRGB_332:

   127 		case EUidPixelFormatA_8:

   128 		case EUidPixelFormatBGR_332:

   129 		case EUidPixelFormatP_8:

   130 		case EUidPixelFormatL_8:

   131 			return 8;

   132 		case EUidPixelFormatRGB_565:

   133 		case EUidPixelFormatBGR_565:

   134 		case EUidPixelFormatARGB_1555:

   135 		case EUidPixelFormatXRGB_1555:

   136 		case EUidPixelFormatARGB_4444:

   137 		case EUidPixelFormatARGB_8332:

   138 		case EUidPixelFormatBGRX_5551:

   139 		case EUidPixelFormatBGRA_5551:

   140 		case EUidPixelFormatBGRA_4444:

   141 		case EUidPixelFormatBGRX_4444:

   142 		case EUidPixelFormatAP_88:

   143 		case EUidPixelFormatXRGB_4444:

   144 		case EUidPixelFormatXBGR_4444:

   145 			return 16;

   146 		case EUidPixelFormatBGR_888:

   147 		case EUidPixelFormatRGB_888:

   148 			return 24;

   149 		case EUidPixelFormatXRGB_8888:

   150 		case EUidPixelFormatBGRX_8888:

   151 		case EUidPixelFormatXBGR_8888:

   152 		case EUidPixelFormatBGRA_8888:

   153 		case EUidPixelFormatARGB_8888:

   154 		case EUidPixelFormatABGR_8888:

   155 		case EUidPixelFormatARGB_8888_PRE:

   156 		case EUidPixelFormatABGR_8888_PRE:

   157 		case EUidPixelFormatBGRA_8888_PRE:

   158 		case EUidPixelFormatARGB_2101010:

   159 		case EUidPixelFormatABGR_2101010:

   160 			return 32;

   161 		default:

   162 			GRAPHICS_ASSERT_DEBUG(EFalse, EDirectGdiPanicInvalidDisplayMode);

   163 			return 0;

   164 		};	

   165 	}

   166 

   167 /**

   168 Create pixel buffer reader from a given pixel buffer by specifying its buffer addres and properties.

   169 Supported format are:

   170 -EUidPixelFormatRGB_565

   171 -EUidPixelFormatXRGB_8888

   172 -EUidPixelFormatARGB_8888

   173 -EUidPixelFormatARGB_8888_PRE

   174 */

   175 TPixelBufferReader::TPixelBufferReader(const TUint32* aPixelBuffer, const TSize& aSize, TInt aStride, TUidPixelFormat aFormat):

   176 	iBuffer(aPixelBuffer),

   177 	iSize(aSize),

   178 	iStride(aStride),

   179 	iFormat(aFormat)

   180 	{

   181 	GRAPHICS_ASSERT_DEBUG(iBuffer && iStride!=0, EDirectGdiPanicInvalidBitmap);

   182 	GRAPHICS_ASSERT_DEBUG(iSize.iWidth!=0 && iSize.iHeight!=0, EDirectGdiPanicOutOfBounds);

   183 	GRAPHICS_ASSERT_DEBUG(

   184 		iFormat==EUidPixelFormatRGB_565 ||

   185 		iFormat==EUidPixelFormatXRGB_8888 ||

   186 		iFormat==EUidPixelFormatARGB_8888 ||

   187 		iFormat==EUidPixelFormatARGB_8888_PRE,

   188 		EDirectGdiPanicInvalidDisplayMode);

   189 	}

   190 

   191 /**

   192 Copies pixels into user buffer starting and ending based on the given read position and 

   193 read length (in pixels). Convert data into user pixel format if requested.

   194 Copying will be done forward or backward (from a given read position) based on read direction parameter.

   195 

   196 @pre	TPixelBufferReader object was constructed with valid pixel buffer and its properties.

   197 		Starting and ending read position is within the pixel buffer area.

   198 		Supported read format:

   199 			RGB_565

   200 			XRGB_8888, ARGB_8888 or ARGB_8888_PRE.

   201 @post	Pixels copied into user buffer.

   202 */

   203 void TPixelBufferReader::GetScanLine(TDes8& aReadBuf, const TPoint& aReadPos, TInt aReadLen,

   204 		TUidPixelFormat aReadFormat, TReadDirection aReadDir) const

   205 	{

   206 	GRAPHICS_ASSERT_DEBUG(aReadPos.iX>=0 && aReadPos.iX<iSize.iWidth &&

   207 		aReadPos.iY>=0 && aReadPos.iY<iSize.iHeight, EDirectGdiPanicOutOfBounds);

   208 	GRAPHICS_ASSERT_DEBUG(

   209 		aReadFormat==EUidPixelFormatRGB_565 ||

   210 		aReadFormat==EUidPixelFormatXRGB_8888 ||

   211 		aReadFormat==EUidPixelFormatARGB_8888 ||

   212 		aReadFormat==EUidPixelFormatARGB_8888_PRE,

   213 		EDirectGdiPanicInvalidDisplayMode);

   214 

   215 #ifdef _DEBUG

   216 	switch (aReadDir)

   217 		{

   218 		case EReadHorizontal:

   219 		GRAPHICS_ASSERT_DEBUG(aReadPos.iX+aReadLen<=iSize.iWidth, EDirectGdiPanicOutOfBounds);

   220 		break;

   221 

   222 		case EReadHorizontalReverse:

   223 		GRAPHICS_ASSERT_DEBUG(aReadPos.iX-aReadLen+1>=0, EDirectGdiPanicOutOfBounds);

   224 		break;

   225 		

   226 		case EReadVertical:

   227   		GRAPHICS_ASSERT_DEBUG(aReadPos.iY+aReadLen<=iSize.iHeight, EDirectGdiPanicOutOfBounds);

   228 		break;

   229 		

   230 		case EReadVerticalReverse:

   231   		GRAPHICS_ASSERT_DEBUG(aReadPos.iY-aReadLen+1>=0, EDirectGdiPanicOutOfBounds);

   232 		break;

   233 		}

   234 #endif

   235 

   236 	switch(aReadFormat)

   237 		{

   238 		case EUidPixelFormatRGB_565:

   239 			GetScanLineRGB_565(aReadBuf, aReadPos, aReadLen,  aReadDir);

   240 			break;

   241 		case EUidPixelFormatXRGB_8888:

   242 			GetScanLineXRGB_8888(aReadBuf, aReadPos, aReadLen,  aReadDir);

   243 			break;

   244 		case EUidPixelFormatARGB_8888:

   245 			GetScanLineARGB_8888(aReadBuf, aReadPos, aReadLen,  aReadDir);

   246 			break;

   247 		case EUidPixelFormatARGB_8888_PRE:

   248 			GetScanLineARGB_8888_PRE(aReadBuf, aReadPos, aReadLen,  aReadDir);

   249 			break;

   250 		default:

   251 			aReadBuf.SetLength(0);

   252 			break;

   253 		};

   254 	}

   255 

   256 /**

   257 Copies pixels into user buffer starting and ending based on the given read position and 

   258 read length (in pixels). Converts data into user pixel format and scales up or down depending

   259 on the specified parameters. Copying will be done forward or backward (from a given read position)

   260 based on read direction parameter.

   261 

   262 @pre	TPixelBufferReader object was constructed with valid pixel buffer and its properties.

   263 		Starting and ending read position is within the pixel buffer area.

   264 		Supported read format:

   265 			RGB_565

   266 			XRGB_8888, ARGB_8888 or ARGB_8888_PRE.

   267 @post	Pixels copied into user buffer.

   268 */

   269 void TPixelBufferReader::GetScaledScanLine(TDes8& aReadBuf, const TPoint& aReadPos, TInt aClipPos,

   270 		TInt aClipLen, TInt aDestLen, TInt aSrcLen, TUidPixelFormat aReadFormat,

   271 		TReadDirection aReadDir) const

   272 	{

   273 	GRAPHICS_ASSERT_DEBUG(aReadPos.iX>=0 && aReadPos.iX<iSize.iWidth &&

   274 		aReadPos.iY>=0 && aReadPos.iY<iSize.iHeight, EDirectGdiPanicOutOfBounds);

   275 

   276 	GRAPHICS_ASSERT_DEBUG(

   277 		aReadFormat==EUidPixelFormatRGB_565 ||

   278 		aReadFormat==EUidPixelFormatXRGB_8888 ||

   279 		aReadFormat==EUidPixelFormatARGB_8888 ||

   280 		aReadFormat==EUidPixelFormatARGB_8888_PRE,

   281 		EDirectGdiPanicInvalidDisplayMode);

   282 

   283 	if (aReadDir == EReadHorizontal || aReadDir == EReadHorizontalReverse)

   284 		{

   285 		GetScaledScanLineH(aReadBuf, aReadPos, aClipPos, aClipLen, aDestLen, aSrcLen, aReadFormat, aReadDir);

   286 		}

   287 	else

   288 		{

   289 		GetScaledScanLineV(aReadBuf, aReadPos, aClipPos, aClipLen, aDestLen, aSrcLen, aReadFormat, aReadDir);

   290 		}

   291 	}

   292 

   293 /**

   294 Gets pixel address in arbitrary position within the buffer

   295 */

   296 const TUint32* TPixelBufferReader::GetPixelAddr(const TPoint& aPos) const

   297 	{

   298 	const TUint32* slptr = GetScanLineAddr(aPos.iY);

   299 	return PixelFormatUtil::BitsPerPixel(iFormat)==32? slptr+aPos.iX : (TUint32*)((TUint16*)slptr+aPos.iX);

   300 	}

   301 

   302 /**

   303 Gets scanline address for a give row poisition

   304 */

   305 const TUint32* TPixelBufferReader::GetScanLineAddr(TInt aRow) const

   306 	{

   307 	return (iBuffer + (aRow * iStride >> 2));

   308 	}

   309 

   310 /**

   311 Copies from 16-bit src to 32-bit dest

   312 */

   313 void TPixelBufferReader::CopyFromRGB_565(TUint32* aDstPtr, const TUint16* aSrcPtr,

   314 		TInt aNumOfPixels, TInt aAdvance) const

   315 	{

   316 	const TUint16* lowAdd = Convert16to32bppLow();

   317 	const TUint32* highAdd = Convert16to32bppHigh();

   318 

   319 	while (aNumOfPixels--)

   320 		{

   321 		const TUint8 low = *aSrcPtr & 0xff;

   322 		const TUint8 high = *aSrcPtr >> 8;

   323 		*aDstPtr++ = (*(highAdd+high)) | (*(lowAdd+low));

   324 		

   325 		aSrcPtr += aAdvance;

   326 		}

   327 	}

   328 

   329 /**

   330 Calculates pixel position increment based on a given read direction and buffer pixel format.

   331 */

   332 TInt TPixelBufferReader::GetAdvance(TReadDirection aReadDir) const

   333 	{

   334 	TInt advance = 0;

   335 	// supported pixel buffer is either 16-bit or 32-bit

   336 	//

   337 	switch (aReadDir)

   338 		{

   339 		case EReadHorizontal:

   340 			advance = 1;

   341 			break;

   342 		case EReadHorizontalReverse:

   343 			advance = -1;

   344 			break;

   345 		case EReadVertical:

   346 			advance = PixelFormatUtil::BitsPerPixel(iFormat)==16? iStride >> 1 : iStride >> 2;

   347 			break;

   348 		case EReadVerticalReverse:

   349 			advance = PixelFormatUtil::BitsPerPixel(iFormat)==16? -(iStride >> 1) : -(iStride >> 2);

   350 			break;

   351 		}

   352 

   353 	return advance;

   354 	}

   355 

   356 /**

   357 Reads and converts scanline into RGB_565.

   358 */

   359 void TPixelBufferReader::GetScanLineRGB_565(TDes8& aReadBuf, const TPoint& aReadPos, TInt aReadLen,

   360 		TReadDirection aReadDir) const

   361 	{

   362 	// read as much as buffer can hold

   363 	aReadLen = Min(aReadLen, aReadBuf.MaxLength() >> 1);

   364 	aReadBuf.SetLength(aReadLen << 1);

   365 

   366 	TUint16* dstPtr = (TUint16*)aReadBuf.Ptr();

   367 	const TUint32* scanLinePtr = GetScanLineAddr(aReadPos.iY);

   368 	TInt posX = aReadPos.iX;

   369 	const TInt advance = GetAdvance(aReadDir);

   370 

   371 	// supported pixel buffer:

   372 	// RGB_565

   373 	// XRGB_8888

   374 	// ARGB_8888

   375 	// ARGB_8888_PRE

   376 	//

   377 	switch (iFormat)		

   378 		{

   379 		case EUidPixelFormatRGB_565:

   380 			{

   381 			const TUint16* srcPtr = (TUint16*)scanLinePtr + posX;

   382 			while (aReadLen--)

   383 				{

   384 				*dstPtr++ = *srcPtr;

   385 				srcPtr += advance;

   386 				}

   387 			}

   388 			break;

   389 

   390 		case EUidPixelFormatXRGB_8888:

   391 			{

   392 			const TUint32* srcPtr = scanLinePtr + posX;

   393 			while (aReadLen--)

   394 				{

   395 				*dstPtr++ = TUint16(TRgb::Color16MU(*srcPtr).Color64K());

   396 				srcPtr += advance;

   397 				}

   398 			}

   399 			break;

   400 

   401 		case EUidPixelFormatARGB_8888:

   402 			{

   403 			const TUint32* srcPtr = scanLinePtr + posX;

   404 			while (aReadLen--)

   405 				{

   406 				*dstPtr++ = TUint16(TRgb::Color16MA(*srcPtr).Color64K());

   407 				srcPtr += advance;

   408 				}

   409 			}

   410 			break;

   411 

   412 		case EUidPixelFormatARGB_8888_PRE:

   413 			{

   414 			const TUint32* srcPtr = scanLinePtr + posX;

   415 			while (aReadLen--)

   416 				{

   417 				*dstPtr++ = TUint16(TRgb::Color16MAP(*srcPtr).Color64K());

   418 				srcPtr += advance;

   419 				}

   420 			}

   421 			break;

   422 		}

   423 	}

   424 

   425 /**

   426 Reads and converts scanline into XRGB_8888.

   427 */

   428 void TPixelBufferReader::GetScanLineXRGB_8888(TDes8& aReadBuf, const TPoint& aReadPos, TInt aReadLen,

   429 		TReadDirection aReadDir) const

   430 	{

   431 	// read as much as buffer can hold

   432 	aReadLen = Min(aReadLen, aReadBuf.MaxLength() >> 2);

   433 	aReadBuf.SetLength(aReadLen << 2);

   434 

   435 	TUint32* dstPtr = (TUint32*)aReadBuf.Ptr();

   436 	const TUint32* scanLinePtr = GetScanLineAddr(aReadPos.iY);

   437 	TInt posX = aReadPos.iX;

   438 	const TInt advance = GetAdvance(aReadDir);

   439 

   440 	// supported pixel buffer:

   441 	// RGB_565

   442 	// XRGB_8888

   443 	// ARGB_8888

   444 	// ARGB_8888_PRE

   445 	//

   446 	switch (iFormat)

   447 		{

   448 		case EUidPixelFormatRGB_565:

   449 			{

   450 			const TUint16* srcPtr = (TUint16*)scanLinePtr + posX;

   451 			CopyFromRGB_565(dstPtr, srcPtr, aReadLen, advance);

   452 			}

   453 			break;

   454 

   455 		case EUidPixelFormatXRGB_8888:

   456 		case EUidPixelFormatARGB_8888:

   457 			{

   458 			const TUint32* srcPtr = scanLinePtr + posX;

   459 			while (aReadLen--)

   460 				{

   461 				*dstPtr++ = *srcPtr;

   462 				srcPtr += advance;

   463 				}

   464 			}

   465 			break;

   466 

   467 		case EUidPixelFormatARGB_8888_PRE:

   468 			{

   469 			const TUint32* srcPtr = scanLinePtr + posX;

   470 			const TUint16* normTable = PtrTo16BitNormalisationTable();

   471 			while(aReadLen--)

   472 				{

   473 				*dstPtr++ = PMA2NonPMAPixel(*srcPtr, normTable);

   474 				srcPtr += advance;

   475 				}			

   476 			}

   477 			break;

   478 		}

   479 	}

   480 

   481 /**

   482 Reads and converts scanline into ARGB_8888.

   483 */

   484 void TPixelBufferReader::GetScanLineARGB_8888(TDes8& aReadBuf, const TPoint& aReadPos, TInt aReadLen,

   485 		TReadDirection aReadDir) const

   486 	{

   487 	// read as much as buffer can hold

   488 	aReadLen = Min(aReadLen, aReadBuf.MaxLength() >> 2);

   489 	aReadBuf.SetLength(aReadLen << 2);

   490 

   491 	TUint32* dstPtr = (TUint32*)aReadBuf.Ptr();

   492 	const TUint32* scanLinePtr = GetScanLineAddr(aReadPos.iY);

   493 	TInt posX = aReadPos.iX;

   494 	const TInt advance = GetAdvance(aReadDir);

   495 

   496 	// supported pixel buffer:

   497 	// RGB_565

   498 	// XRGB_8888

   499 	// ARGB_8888

   500 	// ARGB_8888_PRE

   501 	//

   502 	switch (iFormat)

   503 		{

   504 		case EUidPixelFormatRGB_565:

   505 			{

   506 			const TUint16* srcPtr = (TUint16*)scanLinePtr + posX;

   507 			CopyFromRGB_565(dstPtr, srcPtr, aReadLen, advance);

   508 			}

   509 			break;

   510 

   511 		case EUidPixelFormatXRGB_8888:

   512 			{

   513 			const TUint32* srcPtr = scanLinePtr + posX;

   514 			while (aReadLen--)

   515 				{

   516 				*dstPtr++ = 0xff000000 | *srcPtr;

   517 				srcPtr += advance;

   518 				}

   519 			}

   520 			break;

   521 		

   522 		case EUidPixelFormatARGB_8888:

   523 			{

   524 			const TUint32* srcPtr = scanLinePtr + posX;

   525 			while (aReadLen--)

   526 				{

   527 				*dstPtr++ = *srcPtr;

   528 				srcPtr += advance;

   529 				}

   530 			}

   531 			break;

   532 

   533 		case EUidPixelFormatARGB_8888_PRE:

   534 			{

   535 			const TUint32* srcPtr = scanLinePtr + posX;

   536 			const TUint16* normTable = PtrTo16BitNormalisationTable();

   537 			while(aReadLen--)

   538 				{

   539 				*dstPtr++ = PMA2NonPMAPixel(*srcPtr, normTable);

   540 				srcPtr += advance;

   541 				}			

   542 			}

   543 			break;

   544 		}

   545 	}

   546 

   547 /**

   548 Read and convert scanline into ARGB_8888_PRE.

   549 */

   550 void TPixelBufferReader::GetScanLineARGB_8888_PRE(TDes8& aReadBuf, const TPoint& aReadPos, TInt aReadLen,

   551 		TReadDirection aReadDir) const

   552 	{

   553 	// read as much as buffer can hold

   554 	aReadLen = Min(aReadLen, aReadBuf.MaxLength() >> 2);

   555 	aReadBuf.SetLength(aReadLen << 2);

   556 

   557 	TUint32* dstPtr = (TUint32*)aReadBuf.Ptr();

   558 	const TUint32* scanLinePtr = GetScanLineAddr(aReadPos.iY);

   559 	TInt posX = aReadPos.iX;

   560 	const TInt advance = GetAdvance(aReadDir);

   561 

   562 	// supported pixel buffer:

   563 	// RGB_565

   564 	// XRGB_8888

   565 	// ARGB_8888

   566 	// ARGB_8888_PRE

   567 	//

   568 	switch (iFormat)

   569 		{

   570 		case EUidPixelFormatRGB_565:

   571 			{

   572 			const TUint16* srcPtr = (TUint16*)scanLinePtr + posX;

   573 			CopyFromRGB_565(dstPtr, srcPtr, aReadLen, advance);

   574 			}

   575 			break;

   576 

   577 		case EUidPixelFormatXRGB_8888:

   578 			{

   579 			const TUint32* srcPtr = scanLinePtr + posX;

   580 			while (aReadLen--)

   581 				{

   582 				*dstPtr++ = 0xff000000 | *srcPtr;

   583 				srcPtr += advance;

   584 				}

   585 			}

   586 			break;

   587 

   588 		case EUidPixelFormatARGB_8888:

   589 			{

   590 			const TUint32* srcPtr = scanLinePtr + posX;

   591 			while (aReadLen--)

   592 				{

   593 				TUint32 argb = *srcPtr;

   594 				Convert2PMA(argb);

   595 				*dstPtr++ = argb;

   596 

   597 				srcPtr += advance;

   598 				}

   599 			}

   600 			break;

   601 

   602 		case EUidPixelFormatARGB_8888_PRE:

   603 			{

   604 			const TUint32* srcPtr = scanLinePtr + posX;

   605 			while (aReadLen--)

   606 				{

   607 				*dstPtr++ = *srcPtr;

   608 				srcPtr += advance;

   609 				}

   610 			}

   611 			break;

   612 		}

   613 	}

   614 

   615 /**

   616 Reads and scales pixels horizontally from either left or right. Converts to other pixel format if

   617 requested.

   618 */

   619 void TPixelBufferReader::GetScaledScanLineH(TDes8& aReadBuf, const TPoint& aReadPos, TInt aClipDestPos,

   620 		TInt aClipDestLen, TInt aDestLen, TInt aSrcLen, TUidPixelFormat aReadFormat,

   621 		TReadDirection aReadDir) const

   622 	{

   623 	// setup DDA for scaling in X direction, use read pos as starting point and move right or left

   624 	// depending on the read direction

   625 	//

   626 	TLinearDDA xScaler;

   627 	TPoint xPos(aReadPos.iX, 0);

   628 	const TPoint delta = aReadDir==EReadHorizontal? TPoint(aSrcLen, aDestLen) : TPoint(-aSrcLen, aDestLen);

   629 	xScaler.Construct(xPos, xPos + delta, TLinearDDA::ELeft);

   630 

   631 	// jump to dest X position and return the corresponding src X position

   632 	xPos.iY = aClipDestPos;

   633 	if (aClipDestPos > 0)

   634 		{

   635 		xScaler.JumpToYCoord(xPos.iX, xPos.iY);

   636 		}

   637 	else

   638 		{

   639 		xScaler.NextStep(xPos);

   640 		}

   641 

   642 	const TUint32* scanLinePtr = GetScanLineAddr(aReadPos.iY);

   643 

   644 	// supported pixel buffer:

   645 	// RGB_565

   646 	// XRGB_8888

   647 	// ARGB_8888

   648 	// ARGB_8888_PRE

   649 

   650 	// supported read format

   651 	// RGB_565

   652 	// XRGB_8888

   653 	// ARGB_8888

   654 	// ARGB_8888_PRE

   655 

   656 	switch(aReadFormat)

   657 		{

   658 		case EUidPixelFormatRGB_565:

   659 			{

   660 			aClipDestLen = Min(aClipDestLen, aReadBuf.MaxLength() >> 1);

   661 			aReadBuf.SetLength(aClipDestLen << 1);

   662 

   663 			TUint16* dstPtr = (TUint16*)aReadBuf.Ptr();

   664 			TUint16* dstLimit = dstPtr + aClipDestLen;

   665 			

   666 			switch (iFormat)

   667 				{

   668 				case EUidPixelFormatRGB_565:

   669 					{

   670 					const TUint16* srcPtr = (TUint16*) scanLinePtr;					

   671 					while(dstPtr < dstLimit)

   672 						{

   673 						*dstPtr++ = *(srcPtr + xPos.iX);

   674 						xScaler.NextStep(xPos);

   675 						}

   676 					}

   677 					break;

   678 

   679 				case EUidPixelFormatXRGB_8888:

   680 					{

   681 					const TUint32* srcPtr = scanLinePtr;

   682 					while (dstPtr < dstLimit)

   683 						{

   684 						*dstPtr++ = TUint16(TRgb::Color16MU(*(srcPtr + xPos.iX)).Color64K());

   685 						xScaler.NextStep(xPos);

   686 						}

   687 					}

   688 					break;

   689 

   690 				case EUidPixelFormatARGB_8888:

   691 					{

   692 					const TUint32* srcPtr = scanLinePtr;

   693 					while (dstPtr < dstLimit)

   694 						{

   695 						*dstPtr++ = TUint16(TRgb::Color16MA(*(srcPtr + xPos.iX)).Color64K());

   696 						xScaler.NextStep(xPos);

   697 						}

   698 					}

   699 					break;

   700 

   701 				case EUidPixelFormatARGB_8888_PRE:

   702 					{

   703 					const TUint32* srcPtr = scanLinePtr;

   704 					while (dstPtr < dstLimit)

   705 						{

   706 						*dstPtr++ = TUint16(TRgb::Color16MAP(*(srcPtr + xPos.iX)).Color64K());

   707 						xScaler.NextStep(xPos);

   708 						}

   709 					}

   710 					break;

   711 				}

   712 			}

   713 			break;

   714 

   715 		case EUidPixelFormatXRGB_8888:

   716 			{

   717 			aClipDestLen = Min(aClipDestLen, aReadBuf.MaxLength() >> 2);

   718 			aReadBuf.SetLength(aClipDestLen << 2);

   719 

   720 			TUint32* dstPtr = (TUint32*)aReadBuf.Ptr();

   721 			TUint32* dstLimit = dstPtr + aClipDestLen;

   722 			

   723 			switch (iFormat)

   724 				{

   725 				case EUidPixelFormatRGB_565:

   726 					{

   727 					const TUint16* srcPtr = (TUint16*)scanLinePtr;

   728 

   729 					const TUint16* lowAdd = Convert16to32bppLow();

   730 					const TUint32* highAdd = Convert16to32bppHigh();

   731 

   732 					while (dstPtr < dstLimit)

   733 						{

   734 						TUint16 c = *(srcPtr + xPos.iX);

   735 						const TUint8 low = c & 0xff;

   736 						const TUint8 high = c >> 8;

   737 						*dstPtr++ = (*(highAdd+high)) | (*(lowAdd+low));

   738 						

   739 						xScaler.NextStep(xPos);

   740 						}

   741 					}

   742 					break;

   743 

   744 				case EUidPixelFormatXRGB_8888:

   745 				case EUidPixelFormatARGB_8888:

   746 					{

   747 					const TUint32* srcPtr = scanLinePtr;

   748 					while(dstPtr < dstLimit)

   749 						{

   750 						*dstPtr++ = *(srcPtr + xPos.iX);

   751 						xScaler.NextStep(xPos);

   752 						}

   753 					}

   754 					break;

   755 

   756 				case EUidPixelFormatARGB_8888_PRE:

   757 					{

   758 					const TUint32* srcPtr = scanLinePtr;

   759 					const TUint16* normTable = PtrTo16BitNormalisationTable();

   760 					while(dstPtr < dstLimit)

   761 						{

   762 						*dstPtr++ = PMA2NonPMAPixel(*(srcPtr + xPos.iX), normTable);

   763 						xScaler.NextStep(xPos);

   764 						}			

   765 					}

   766 					break;

   767 				}

   768 			}

   769 			break;

   770 		

   771 		case EUidPixelFormatARGB_8888:

   772 			{

   773 			aClipDestLen = Min(aClipDestLen, aReadBuf.MaxLength() >> 2);

   774 			aReadBuf.SetLength(aClipDestLen << 2);

   775 

   776 			TUint32* dstPtr = (TUint32*)aReadBuf.Ptr();

   777 			TUint32* dstLimit = dstPtr + aClipDestLen;

   778 			

   779 			switch (iFormat)

   780 				{

   781 				case EUidPixelFormatRGB_565:

   782 					{

   783 					const TUint16* srcPtr = (TUint16*)scanLinePtr;

   784 

   785 					const TUint16* lowAdd = Convert16to32bppLow();

   786 					const TUint32* highAdd = Convert16to32bppHigh();

   787 

   788 					while (dstPtr < dstLimit)

   789 						{

   790 						TUint16 c = *(srcPtr + xPos.iX);

   791 						const TUint8 low = c & 0xff;

   792 						const TUint8 high = c >> 8;

   793 						*dstPtr++ = (*(highAdd+high)) | (*(lowAdd+low));

   794 						

   795 						xScaler.NextStep(xPos);

   796 						}

   797 					}

   798 					break;

   799 					

   800 				case EUidPixelFormatXRGB_8888:

   801 					{

   802 					const TUint32* srcPtr = scanLinePtr;

   803 					while(dstPtr < dstLimit)

   804 						{

   805 						*dstPtr++ = 0xff000000 | *(srcPtr + xPos.iX);

   806 						xScaler.NextStep(xPos);

   807 						}

   808 					}

   809 					break;

   810 				

   811 				case EUidPixelFormatARGB_8888:

   812 					{

   813 					const TUint32* srcPtr = scanLinePtr;

   814 					while(dstPtr < dstLimit)

   815 						{

   816 						*dstPtr++ = *(srcPtr + xPos.iX);

   817 						xScaler.NextStep(xPos);

   818 						}

   819 					}

   820 					break;

   821 

   822 				case EUidPixelFormatARGB_8888_PRE:

   823 					{

   824 					const TUint32* srcPtr = scanLinePtr;

   825 					const TUint16* normTable = PtrTo16BitNormalisationTable();

   826 					while(dstPtr < dstLimit)

   827 						{

   828 						*dstPtr++ = PMA2NonPMAPixel(*(srcPtr + xPos.iX), normTable);

   829 						xScaler.NextStep(xPos);

   830 						}			

   831 					}

   832 					break;

   833 				}

   834 			}

   835 			break;

   836 

   837 		case EUidPixelFormatARGB_8888_PRE:

   838 			{

   839 			aClipDestLen = Min(aClipDestLen, aReadBuf.MaxLength() >> 2);

   840 			aReadBuf.SetLength(aClipDestLen << 2);

   841 

   842 			TUint32* dstPtr = (TUint32*)aReadBuf.Ptr();

   843 			TUint32* dstLimit = dstPtr + aClipDestLen;

   844 			

   845 			switch (iFormat)

   846 				{

   847 				case EUidPixelFormatRGB_565:

   848 					{

   849 					const TUint16* srcPtr = (TUint16*)scanLinePtr;

   850 

   851 					const TUint16* lowAdd = Convert16to32bppLow();

   852 					const TUint32* highAdd = Convert16to32bppHigh();

   853 

   854 					while (dstPtr < dstLimit)

   855 						{

   856 						TUint16 c = *(srcPtr + xPos.iX);

   857 						const TUint8 low = c & 0xff;

   858 						const TUint8 high = c >> 8;

   859 						*dstPtr++ = (*(highAdd+high)) | (*(lowAdd+low));

   860 						

   861 						xScaler.NextStep(xPos);

   862 						}

   863 					}

   864 					break;

   865 

   866 				case EUidPixelFormatXRGB_8888:

   867 					{

   868 					const TUint32* srcPtr = scanLinePtr;

   869 					while(dstPtr < dstLimit)

   870 						{

   871 						*dstPtr++ = 0xff000000 | *(srcPtr + xPos.iX);

   872 						xScaler.NextStep(xPos);

   873 						}

   874 					}

   875 					break;

   876 

   877 				case EUidPixelFormatARGB_8888_PRE:

   878 					{

   879 					const TUint32* srcPtr = scanLinePtr;

   880 					while(dstPtr < dstLimit)

   881 						{

   882 						*dstPtr++ = *(srcPtr + xPos.iX);

   883 						xScaler.NextStep(xPos);

   884 						}

   885 					}

   886 					break;

   887 

   888 				case EUidPixelFormatARGB_8888:

   889 					{

   890 					const TUint32* srcPtr = scanLinePtr;

   891 					while (dstPtr < dstLimit)

   892 						{

   893 						TUint32 argb = *(srcPtr + xPos.iX);

   894 						Convert2PMA(argb);

   895 						*dstPtr++ = argb;

   896 

   897 						xScaler.NextStep(xPos);

   898 						}

   899 					}

   900 					break;

   901 				}

   902 			}

   903 		break;

   904 		}

   905 	}

   906 

   907 /**

   908 Reads and scales pixels vertically from either top or bottom. Converts to other pixel format 

   909 if requested.

   910 */

   911 void TPixelBufferReader::GetScaledScanLineV(TDes8& aReadBuf, const TPoint& aReadPos, TInt aClipDestPos,

   912 		TInt aClipDestLen, TInt aDestLen, TInt aSrcLen, TUidPixelFormat aReadFormat,

   913 		TReadDirection aReadDir) const

   914 	{

   915 	// setup DDA for scaling in Y direction, use read pos as starting point and move up or down

   916 	// depending on the read direction

   917 	//

   918 	TLinearDDA yScaler;

   919 	TPoint yPos(aReadPos.iY, 0);

   920 	const TPoint delta = aReadDir==EReadVertical? TPoint(aSrcLen, aDestLen) : TPoint(-aSrcLen, aDestLen);

   921 	yScaler.Construct(yPos, yPos + delta, TLinearDDA::ELeft);

   922 

   923 	// jump to dest Y position and return the corresponding src Y position

   924 	yPos.iY = aClipDestPos;

   925 	if (aClipDestPos > 0)

   926 		{

   927 		yScaler.JumpToYCoord(yPos.iX, yPos.iY);

   928 		}

   929 	else

   930 		{

   931 		yScaler.NextStep(yPos);

   932 		}

   933 

   934 	// supported pixel buffer:

   935 	// RGB_565

   936 	// XRGB_8888

   937 	// ARGB_8888

   938 	// ARGB_8888_PRE

   939 

   940 	// supported read format

   941 	// RGB_565

   942 	// XRGB_8888

   943 	// ARGB_8888

   944 	// ARGB_8888_PRE

   945 

   946 	switch(aReadFormat)

   947 		{

   948 		case EUidPixelFormatRGB_565:

   949 			{

   950 			aClipDestLen = Min(aClipDestLen, aReadBuf.MaxLength() >> 1);

   951 			aReadBuf.SetLength(aClipDestLen << 1);

   952 

   953 			TUint16* dstPtr = (TUint16*)aReadBuf.Ptr();

   954 			TUint16* dstLimit = dstPtr + aClipDestLen;

   955 			

   956 			switch (iFormat)

   957 				{

   958 				case EUidPixelFormatRGB_565:

   959 					{

   960 					const TUint16* srcPtr = (TUint16*) iBuffer + aReadPos.iX;

   961 					const TInt offset = iStride >> 1;

   962 					

   963 					while(dstPtr < dstLimit)

   964 						{

   965 						*dstPtr++ = *(srcPtr + yPos.iX * offset);

   966 						yScaler.NextStep(yPos);

   967 						}

   968 					}

   969 					break;

   970 

   971 				case EUidPixelFormatXRGB_8888:

   972 					{

   973 					const TUint32* srcPtr = iBuffer + aReadPos.iX;

   974 					const TInt offset = iStride >> 2;

   975 					

   976 					while (dstPtr < dstLimit)

   977 						{

   978 						*dstPtr++ = TUint16(TRgb::Color16MU(*(srcPtr + yPos.iX * offset)).Color64K());

   979 						yScaler.NextStep(yPos);

   980 						}

   981 					}

   982 					break;

   983 

   984 				case EUidPixelFormatARGB_8888:

   985 					{

   986 					const TUint32* srcPtr = iBuffer + aReadPos.iX;

   987 					const TInt offset = iStride >> 2;

   988 					

   989 					while (dstPtr < dstLimit)

   990 						{

   991 						*dstPtr++ = TUint16(TRgb::Color16MA(*(srcPtr + yPos.iX * offset)).Color64K());

   992 						yScaler.NextStep(yPos);

   993 						}

   994 					}

   995 					break;

   996 

   997 				case EUidPixelFormatARGB_8888_PRE:

   998 					{

   999 					const TUint32* srcPtr = iBuffer + aReadPos.iX;

  1000 					const TInt offset = iStride >> 2;

  1001 					

  1002 					while (dstPtr < dstLimit)

  1003 						{

  1004 						*dstPtr++ = TUint16(TRgb::Color16MAP(*(srcPtr + yPos.iX * offset)).Color64K());

  1005 						yScaler.NextStep(yPos);

  1006 						}

  1007 					}

  1008 					break;

  1009 				}

  1010 			}

  1011 			break;

  1012 

  1013 		case EUidPixelFormatXRGB_8888:

  1014 			{

  1015 			aClipDestLen = Min(aClipDestLen, aReadBuf.MaxLength() >> 2);

  1016 			aReadBuf.SetLength(aClipDestLen << 2);

  1017 

  1018 			TUint32* dstPtr = (TUint32*)aReadBuf.Ptr();

  1019 			TUint32* dstLimit = dstPtr + aClipDestLen;

  1020 			

  1021 			switch (iFormat)

  1022 				{

  1023 				case EUidPixelFormatRGB_565:

  1024 					{

  1025 					const TUint16* srcPtr = (TUint16*)iBuffer + aReadPos.iX;

  1026 					const TInt offset = iStride >> 1;

  1027 

  1028 					const TUint16* lowAdd = Convert16to32bppLow();

  1029 					const TUint32* highAdd = Convert16to32bppHigh();

  1030 

  1031 					while (dstPtr < dstLimit)

  1032 						{

  1033 						TUint16 c = *(srcPtr + yPos.iX * offset);

  1034 						const TUint8 low = c & 0xff;

  1035 						const TUint8 high = c >> 8;

  1036 						*dstPtr++ = (*(highAdd+high)) | (*(lowAdd+low));

  1037 						

  1038 						yScaler.NextStep(yPos);

  1039 						}

  1040 					}

  1041 					break;

  1042 

  1043 				case EUidPixelFormatXRGB_8888:

  1044 				case EUidPixelFormatARGB_8888:				

  1045 					{

  1046 					const TUint32* srcPtr = iBuffer + aReadPos.iX;

  1047 					const TInt offset = iStride >> 2;

  1048 					

  1049 					while(dstPtr < dstLimit)

  1050 						{

  1051 						*dstPtr++ = *(srcPtr + yPos.iX * offset);

  1052 						yScaler.NextStep(yPos);

  1053 						}

  1054 					}

  1055 					break;

  1056 

  1057 				case EUidPixelFormatARGB_8888_PRE:

  1058 					{

  1059 					const TUint32* srcPtr = iBuffer + aReadPos.iX;

  1060 					const TInt offset = iStride >> 2;

  1061 					const TUint16* normTable = PtrTo16BitNormalisationTable();

  1062 					

  1063 					while(dstPtr < dstLimit)

  1064 						{

  1065 						*dstPtr++ = PMA2NonPMAPixel(*(srcPtr + yPos.iX * offset), normTable);

  1066 						yScaler.NextStep(yPos);

  1067 						}			

  1068 					}

  1069 					break;

  1070 				}

  1071 			}

  1072 			break;

  1073 		

  1074 		case EUidPixelFormatARGB_8888:

  1075 			{

  1076 			aClipDestLen = Min(aClipDestLen, aReadBuf.MaxLength() >> 2);

  1077 			aReadBuf.SetLength(aClipDestLen << 2);

  1078 

  1079 			TUint32* dstPtr = (TUint32*)aReadBuf.Ptr();

  1080 			TUint32* dstLimit = dstPtr + aClipDestLen;

  1081 			

  1082 			switch (iFormat)

  1083 				{

  1084 				case EUidPixelFormatRGB_565:

  1085 					{

  1086 					const TUint16* srcPtr = (TUint16*)iBuffer + aReadPos.iX;

  1087 					const TInt offset = iStride >> 1;

  1088 

  1089 					const TUint16* lowAdd = Convert16to32bppLow();

  1090 					const TUint32* highAdd = Convert16to32bppHigh();

  1091 

  1092 					while (dstPtr < dstLimit)

  1093 						{

  1094 						TUint16 c = *(srcPtr + yPos.iX * offset);

  1095 						const TUint8 low = c & 0xff;

  1096 						const TUint8 high = c >> 8;

  1097 						*dstPtr++ = (*(highAdd+high)) | (*(lowAdd+low));

  1098 						

  1099 						yScaler.NextStep(yPos);

  1100 						}

  1101 					}

  1102 					break;

  1103 					

  1104 				case EUidPixelFormatXRGB_8888:

  1105 					{

  1106 					const TUint32* srcPtr = iBuffer + aReadPos.iX;

  1107 					const TInt offset = iStride >> 2;

  1108 					

  1109 					while(dstPtr < dstLimit)

  1110 						{

  1111 						*dstPtr++ = 0xff000000 | *(srcPtr + yPos.iX * offset);

  1112 						yScaler.NextStep(yPos);

  1113 						}

  1114 					}

  1115 					break;

  1116 				

  1117 				case EUidPixelFormatARGB_8888:

  1118 					{

  1119 					const TUint32* srcPtr = iBuffer + aReadPos.iX;

  1120 					const TInt offset = iStride >> 2;

  1121 					

  1122 					while(dstPtr < dstLimit)

  1123 						{

  1124 						*dstPtr++ = *(srcPtr + yPos.iX * offset);

  1125 						yScaler.NextStep(yPos);

  1126 						}

  1127 					}

  1128 					break;

  1129 

  1130 				case EUidPixelFormatARGB_8888_PRE:

  1131 					{

  1132 					const TUint32* srcPtr = iBuffer + aReadPos.iX;

  1133 					const TInt offset = iStride >> 2;

  1134 					const TUint16* normTable = PtrTo16BitNormalisationTable();

  1135