/*******************************************************************************

 * Copyright (c) 2005, 2010 Nokia Corporation and/or its subsidiary(-ies).

 * All rights reserved. This program and the accompanying materials

 * are made available under the terms of the Eclipse Public License v1.0

 * which accompanies this distribution, and is available at

 * http://www.eclipse.org/legal/epl-v10.html

 *

 * Contributors:

 *     Nokia Corporation - S60 implementation

 *******************************************************************************/

// SwtImage.h

#ifndef SWTIMAGE_H

#define SWTIMAGE_H

#include "eswtgraphics.h"

class CSwtGrPaletteData;

/**

 * CSwtImage

 * C++ implementation of org.eclipse.swt.graphics.Image.

 * Due to lack of support for paletted modes in CFbsBitmap ( the API exists

 * but is empty implemented ), colour images of bit depths 1, 2, 4 and 8 are

 * converted to 24 bits per pixel. This, however, does not affect grayscale

 * images.

 * @lib eswt

 */

NONSHARABLE_CLASS(CSwtImage)

        : public CBase

        , public MSwtImage

        , public MSwtResourceChangeObserver

{

// Data types

private:

    enum TMaskType

    {

        ENoMask = 0,    // No transparency

        EBinaryMask,    // Binary transparency

        EColorKey,      // Colour key: a colour is considered transparent.

        EDirtyColorKey, // Same as EColorKey but the mask needs to be regenerated

        EAlphaMask      // Alpha transparency

    };

// Own methods

public:

    /**

     * Two phase constructor.

     * @param aDevice graphic device

     * @param aSize initial image dimensions

     * @param aDisplay parent display

     * @param aMode display mode

     * @return pointer to blank image

     */

    static CSwtImage* NewL(MSwtDevice& aDevice, const TSize& aSize,

                           MSwtDisplay& aDisplay, TDisplayMode aMode = ENone);

    /**

     * Two phase constructor.

     * @param aDevice graphic device

     * @param aData image data

     * @param aDisplay parent display

     * @return pointer to image constructed from image data

     */

    static CSwtImage* NewL(MSwtDevice* aDevice, const MSwtImageData& aData,

                           MSwtDisplay* aDisplay);

    /**

     * Two phase constructor.

     * @param aBitmap source bitmap

     * @param aBitmap source mask

     * @param aTopLeft initial position

     * @param aDelayTime frame delay

     * @param aDisposalMethod disposal method of previous frames

     * @return pointer to image constructed bitmap + mask

     */

    static CSwtImage* NewL(CFbsBitmap& aBitmap, CFbsBitmap* aMask,

                           const TPoint& aTopLeft, TInt aDelayTime, TSwtGifDisposal aDisposalMethod);

private:

    /**

     * First phase constructor.

     * @param aDevice graphic device

     * @param aDisplay parent display

     */

    inline CSwtImage(MSwtDevice* aDevice, MSwtDisplay* aDisplay);

    /**

     * Destructor

     */

    ~CSwtImage();

    /**

     * Second phase constructor.

     * @param aSize initial image dimensions

     * @param aMode display mode

     */

    void ConstructL(const TSize& aSize, TDisplayMode aMode);

    /**

     * Second phase constructor.

     * @param aData image data

     */

    void ConstructL(const MSwtImageData& aData);

    /**

     * Second phase constructor.

     * @param aBitmap source bitmap

     * @param aBitmap source mask

     * @param aTopLeft initial position

     * @param aDelayTime frame delay

     * @param aDisposalMethod disposal method of previous frames

     */

    void ConstructL(CFbsBitmap& aBitmap, CFbsBitmap* aMask, const TPoint& aTopLeft,

                    TInt aDelayTime, TSwtGifDisposal aDisposalMethod);

    /**

     * Color key setter.

     * @param aData image data

     */

    void SetColorKeyL(const MSwtImageData& aData);

    /**

     * Ensures the mask is up to date. This method, although const, may actually

     * modify the image's mask but this will only occur if the image's content

     * has been modified and the mask wasn't updated at that moment.

     */

    void EnsureMaskIsUpToDate() const;

    /**

     * Computes the binary mask from the colour key.

     */

    void ComputeColorKeyMask();

    /**

     * Tests whether the image is a grayscale one.

     */

    TBool IsGrayscale() const;

    /**

     * Creates a new palette data object for the image.

     */

    CSwtGrPaletteData* GetPaletteDataL() const;

    /**

     * Computes the gray mode for the provided palette.

     * @return The gray mode suitable for the current palette or ENone if none

     *         has been found.

     */

    static TDisplayMode PaletteGrayMode(TInt aDepth, const CPalette& aPalette);

    /**

     * Computes the display mode of the provided data.

     * @return The display mode, or ENone if no suitable mode could be found.

     */

    static TDisplayMode DisplayMode(const MSwtImageData& aData);

    /**

     * Returns the bit depth for the specified display mode.

     */

    static TInt BitDepth(TDisplayMode aMode);

    /**

     * Returns the image depth bpp according to the bitmap display type.

     */

    TInt ImageDepth() const;

    /**

     * Returns the scanline padding for the specified bit depth.

     */

    static TInt ScanlinePadding(TInt aBitDepth);

    /**

     * Computes the number of bytes needed in a line.

     */

    static TInt BytesPerLine(TInt aPixelsPerLine, TInt aBitsPerPixel,

                             TInt aPadding);

    /**

     * Fills the provided bitmap with the provided colour.

     */

    static void FillBitmapL(CFbsBitmap& aBitmap, const TRgb& aColor,

                            const TRect& aRect);

    /**

     * Bitblt the bitmap with another bitmap.

     */

    void BitBltBitmapL(CFbsBitmapDevice& aDevice, const CFbsBitmap& aBitmap);

    /**

     * Fills the provided bitmap with the provided colour.

     */

    static void FillBitmapL(CFbsBitmapDevice& aDevice, const TRgb& aColor,

                            const TRect& aRect);

    /**

     * Creates a new palette object for a given gray mode.

     */

    static CPalette* NewGrayPaletteL(TDisplayMode aMode);

    /**

     * Shifts an integer by a certain number of bits.

     * @param aValue The integer whose bits are to be shifted

     * @param aShift The number of bits to shift by; a positive value shifts

     *               to the left, a negative value shifts to the right.

     */

    static inline TUint BitShift(TUint aValue, TInt aShift);

    /**

     * Extracts the red component of a pixel. The result is a value in [0;255].

     */

    static inline TUint GetRed(TUint aPixel,

                               const MSwtPaletteData::TDirectData& aPalette);

    /**

     * Extracts the green component of a pixel. The result is a value in [0;255].

     */

    static inline TUint GetGreen(TUint aPixel,

                                 const MSwtPaletteData::TDirectData& aPalette);

    /**

     * Extracts the blue component of a pixel. The result is a value in [0;255].

     */

    static inline TUint GetBlue(TUint aPixel,

                                const MSwtPaletteData::TDirectData& aPalette);

    /**

     * Extracts the RGB components of a pixel.

     */

    static inline TRgb GetRgb(TUint aPixel,

                              const MSwtPaletteData::TDirectData& aPalette);

    /**

     * Writes a 16-bit pixel in the Symbian format ( [rrrrrggg gggbbbbb] binary ).

     * @param aPtr     Where to write the pixel, the pointer is modified to point

     *                 after the pixel upon return.

     * @param aPixel   The pixel to write

     * @param aPalette Information about aPixel's format.

     */

    static inline void WritePixel16(TUint8*& aPtr, TUint aPixel,

                                    const MSwtPaletteData::TDirectData& aPalette);

    /**

     * Writes a True Color pixel in the Symbian format ( BGR ).

     * @param aPtr     Where to write the pixel, the pointer is modified to point

     *                 after the pixel upon return.

     * @param aPixel   The pixel to write

     * @param aPalette Information about aPixel's format.

     * @param a24Bit   Do the write in 24- or 32-bit format

     */

    static inline void WritePixelTrueColor(TUint8*& aPtr, TUint aPixel,

                                           const MSwtPaletteData::TDirectData& aPalette, TBool a24Bit);

    /**

     * Writes a True Color pixel in the Symbian format ( BGR ).

     * @param aPtr   Where to write the pixel, the pointer is modified to point

     *               after the pixel upon return.

     * @param aColor The colour to write at the specified location.

     */

    static inline void WritePixelTrueColor(TUint8*& aPtr, const TRgb& aColor,

                                           TBool a24Bit);

    /**

     * Copies data from a buffer of bytes to a bitmap.

     */

    static void CopyData(const CFbsBitmap& aBitmap, const TDesC8& aData,

                         TInt aLineCount, TInt aDepth, TInt aBytesPerLine,

                         const MSwtPaletteData* aPalette);

    /**

     * Add mask bitmap's alpha channel.

     */

    void AddMaskToAlphaChannel(const CFbsBitmap& aBitmap, const CFbsBitmap& aMask);

    /**

     * Copies data between two buffers arranged in units of 1 bit.

     * The bits of each byte are reversed on the fly.

     */

    static void Copy1(TUint8* aDest, TInt aBytesPerDestLine,

                      const TUint8* aSrce, TInt aBytesPerSrceLine, TInt aLineCount);

    /**

     * Copies data between two buffers arranged in units of 4 bits.

     * The four quarters of each byte are reversed on the fly.

     */

    static void Copy2(TUint8* aDest, TInt aBytesPerDestLine,

                      const TUint8* aSrce, TInt aBytesPerSrceLine, TInt aLineCount);

    /**

     * Copies data between two buffers arranged in units of 4 bits.

     * The two halves of each byte are swapped on the fly.

     */

    static void Copy4(TUint8* aDest, TInt aBytesPerDestLine,

                      const TUint8* aSrce, TInt aBytesPerSrceLine, TInt aLineCount);

    /**

     * Copies data between two buffers arranged in units of 8 bits.

     */

    static void Copy8(TUint8* aDest, TInt aBytesPerDestLine,

                      const TUint8* aSrce, TInt aBytesPerSrceLine, TInt aLineCount);

    /**

     * Copies data between two buffers arranged in units of 16 bits.

     * The first and last bytes of each unit are swapped on the fly to account

     * for the fact that Symbian's and SWT's red and blue channels are inverted.

     */

    static void Copy16(TUint8* aDest, TInt aBytesPerDestLine,

                       const TUint8* aSrce, TInt aBytesPerSrceLine, TInt aLineCount,

                       const MSwtPaletteData::TDirectData& aPalette);

    /**

     * Copies data from a buffer of 1-bit paletted pixels to a buffer of

     * 24/32-bit pixels.

     */

    static void Copy1ToTrueColor(TUint8* aDest, TInt aBytesPerDestLine,

                                 const TUint8* aSrce, TInt aBytesPerSrceLine, TInt aLineCount,

                                 const CPalette& aPalette, TBool a24Bit);

    /**

     * Copies data from a buffer of 2-bit paletted pixels to a buffer of

     * 24/32-bit pixels.

     */

    static void Copy2ToTrueColor(TUint8* aDest, TInt aBytesPerDestLine,

                                 const TUint8* aSrce, TInt aBytesPerSrceLine, TInt aLineCount,

                                 const CPalette& aPalette, TBool a24Bit);

    /**

     * Copies data from a buffer of 4-bit paletted pixels to a buffer of

     * 24/32-bit pixels

     */

    static void Copy4ToTrueColor(TUint8* aDest, TInt aBytesPerDestLine,

                                 const TUint8* aSrce, TInt aBytesPerSrceLine, TInt aLineCount,

                                 const CPalette& aPalette, TBool a24Bit);

    /**

     * Copies data from a buffer of 8-bit paletted pixels to a buffer of

     * 24/32-bit pixels

     */

    static void Copy8ToTrueColor(TUint8* aDest, TInt aBytesPerDestLine,

                                 const TUint8* aSrce, TInt aBytesPerSrceLine, TInt aLineCount,

                                 const CPalette& aPalette, TBool a24Bit);

    /**

     * Copies data from a buffer of 8-bit pixels to a buffer of 24/32-bit pixels.

     */

    static void Copy8ToTrueColor(TUint8* aDest, TInt aBytesPerDestLine,

                                 const TUint8* aSrce, TInt aBytesPerSrceLine, TInt aLineCount,

                                 const MSwtPaletteData::TDirectData& aPalette, TBool a24Bit);

    /**

     * Copies data between two buffers arranged in units of 24 bits.

     */

    static void Copy24(TUint8* aDest, TInt aBytesPerDestLine,

                       const TUint8* aSrce, TInt aBytesPerSrceLine, TInt aLineCount,

                       const MSwtPaletteData::TDirectData& aPalette);

    /**

     * Copies data between two buffers arranged in units of 24 bits.

     */

    static void Copy32(TUint8* aDest, TInt aBytesPerDestLine,

                       const TUint8* aSrce, TInt aBytesPerSrceLine, TInt aLineCount,

                       const MSwtPaletteData::TDirectData& aPalette);

    /**

     * Returns a newly allocated buffer to the data of the specified bitmap.

     */

    static HBufC8* GetPixelDataLC(const CFbsBitmap& aBitmap);

    /**

     * ?

     */

    static void GetPixels16(TUint8* aDest, TInt aBytesPerDestLine,

                            const TUint8* aSrce, TInt aBytesPerSrceLine, const TSize& aSize);

// From MSwtBitmapDrawable

public:

    MSwtGc* NewGcL();

    CBitmapDevice& GraphicsDevice();

    void HandleUpdate();

private:

    static void DestroyNativeGc(CBitmapContext* aGc);

// From MSwtImage

protected:

    CFbsBitmap& GetBitmap() const;

    CFbsBitmap& GetSubBitmap(const TSize& aSize) const;

// From MSwtImage

public:

    void Dispose();

    const CFbsBitmap* MaskBitmap(TBool aInvertedIfMonochrome = EFalse) const;

    const CFbsBitmap* SubMaskBitmap(const TSize& aSize, TBool aInvertedIfMonochrome = EFalse) const;

    TRect GetBounds() const;

    MSwtImageData* GetImageDataL() const;

    TInt AddSubRef(const TSize& aSize) const;

    TInt RemoveSubRef(const TSize& aSize) const;

    TInt SubRefCount(const TSize& aSize) const;

    CFbsBitmap* BitmapWithAlphaLC();

// From MSwtResourceChangeObserver

public:

    void OfferResourceChangeL(TInt aType);

// Data

private:

    /**

     * The device on which the image is created, may be NULL.

     * Not own.

     */

    MSwtDevice* iDevice;

    /**

     * Colour data, may be owned, cannot be NULL.

     * May be own or not own.

     */

    CFbsBitmap* iBitmap;

    /**

     * Device for drawing onto the bitmap, cannot be NULL.

     * Own.

     */

    CFbsBitmapDevice* iBitmapDevice;

    /**

     * The type of mask we're dealing with

     */

    TMaskType iMaskType;

    /**

     * Transparency mask, binary ( 1 bit ) or alpha ( 8 bits ), may be NULL.

     * May be own or not own.

     */

    CFbsBitmap* iMask;

    /**

     * Transparency mask inverted, binary ( 1 bit ) or alpha ( 8 bits ), may be NULL.

     * Created only upon request.

     * Own.

     */

    mutable CFbsBitmap* iMaskInverted;

    /**

     * The transparent colour, may be NULL.

     * Own.

     */

    TRgb* iColorKey;

    /**

     * The coordinates the bitmap's origin is at within an animation.

     */

    TPoint iOffset;

    /**

     * The original image information

     */

    MSwtImageData::TInfo iInfo;

    /**

     * The iBitmap and iMask object have been created outside of the object.

     * Do not delete them in the destructor.

     */

    TBool iOwnExternally;

    /**

     * The Display the image belongs to, may be NULL.

     * Not own.

     */

    MSwtDisplay* iDisplay;

    /**

     * Array holding the reference count for scaled copies of the main bitmap.

     */

    mutable RArray<TInt> iScaledBitmapRefs;

    /**

     * Array holding the scaled copies of the main bitmap.

     */

    mutable RPointerArray<CFbsBitmap> iScaledBitmaps;

    /**

     * Array holding the scaled copies of the main mask.

     */

    mutable RPointerArray<CFbsBitmap> iScaledMasks;

    /**

     * Array holding the scaled inverted copies of the main mask.

     * Entries valid only if mask is monochrome, otherwise NULL.

     */

    mutable RPointerArray<CFbsBitmap> iScaledMasksInverted;

};

#endif // SWTIMAGE_H