1 /*

     2 * Copyright (c) 2006-2007 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

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

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description:   8 bits for alpha, red, green and blue component in a pixel.

    15 *

    16 */

    17 

    18 

    19 //  INCLUDE FILES

    20 #include "TMID8888Format.h"

    21 

    22 // CONSTANTS

    23 const TInt KMIDAlphaShift = 24;

    24 const TInt KMIDRedShift   = 16;

    25 const TInt KMIDGreenShift =  8;

    26 

    27 inline TUint32 ConvertInternalInline8888(const TMIDInternalARGB& aInternal)

    28 {

    29     return ((aInternal.iA << KMIDAlphaShift) & K8888AMax) |

    30            ((aInternal.iR << KMIDRedShift) & K8888RMax) |

    31            ((aInternal.iG << KMIDGreenShift) & K8888GMax) |

    32            ((aInternal.iB) & K8888BMax);

    33 }

    34 

    35 inline void ConvertInline8888(TMIDInternalARGB& aResult, TUint32 aColor, TBool aTransparency)

    36 {

    37     // set alpha only if a bitmap is transparent, otherwise use full opaque

    38     aResult.iA = aTransparency

    39                  ? (TUint8)((aColor & K8888AMax) >> KMIDAlphaShift)

    40                  : KAlphaFullOpaque;

    41 

    42     aResult.iR = (TUint8)((aColor & K8888RMax) >> KMIDRedShift);

    43     aResult.iG = (TUint8)((aColor & K8888GMax) >> KMIDGreenShift);

    44     aResult.iB = (TUint8)(aColor & K8888BMax);

    45 }

    46 

    47 void TMID8888Format::InitializeL(const TMIDBitmapParameters& aParameters)

    48 {

    49     TMIDFormatConverter::InitializeL(aParameters);

    50     __ASSERT_DEBUG(!iAlphaBitmap, User::Invariant());

    51     iOffset += iTransformer.iPoint.iX + iTransformer.iPoint.iY * iScanlength;

    52     iBitmap = aParameters.iPixels;

    53 }

    54 

    55 TUint32 TMID8888Format::ConvertInternal(const TMIDInternalARGB& aInternal)

    56 {

    57     return ConvertInternalInline8888(aInternal);

    58 }

    59 

    60 void TMID8888Format::Convert(TMIDInternalARGB& aResult, TUint32 aColor) const

    61 {

    62     ConvertInline8888(aResult, aColor, iTransparency);

    63 }

    64 

    65 void TMID8888Format::GetPixel(TMIDInternalARGB& aResult) const

    66 {

    67     ConvertInline8888(aResult, iBitmap[ iOffset ], iTransparency);    // CSI: 2 Wrong index means implementation error #

    68 }

    69 

    70 void TMID8888Format::PlotPixel(const TMIDInternalARGB& aInternal)

    71 {

    72     iBitmap[ iOffset ] = ConvertInternalInline8888(aInternal);    // CSI: 2 Wrong index means implementation error #

    73 }

    74 

    75 TUint8 TMID8888Format::GetAlpha() const

    76 {

    77     // we need only last 8 bits since it is either white or black

    78     __ASSERT_DEBUG(!iAlphaBitmap, User::Invariant());

    79     return (TUint8)(iBitmap[ iOffset ] >> KMIDAlphaShift);    // CSI: 2 Wrong index means implementation error #

    80 }

    81 

    82 void TMID8888Format::GetPixelWithAlpha(TMIDInternalARGB& aResult) const

    83 {

    84     __ASSERT_DEBUG(!iAlphaBitmap, User::Invariant());

    85     GetPixel(aResult);

    86 }

    87 

    88 TBool TMID8888Format::CheckSize(TInt aPixelSize, TInt aLastDrawnPixelOffset)

    89 {

    90     return ((aLastDrawnPixelOffset * KBytesPerPixel8888) <= aPixelSize);

    91 }