/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */

#ifndef INCLUDED_VCL_BMPACC_HXX
#define INCLUDED_VCL_BMPACC_HXX

#include <tools/solar.h>
#include <vcl/dllapi.h>
#include <vcl/salbtype.hxx>
#include <vcl/bitmap.hxx>


// - Access defines -


#define DECL_FORMAT_GETPIXEL( Format ) \
static BitmapColor GetPixelFor##Format( ConstScanline pScanline, long nX, const ColorMask& rMask );

#define DECL_FORMAT_SETPIXEL( Format ) \
static void SetPixelFor##Format( Scanline pScanline, long nX, const BitmapColor& rBitmapColor, const ColorMask& rMask );

#define DECL_FORMAT( Format )   \
DECL_FORMAT_GETPIXEL( Format )  \
DECL_FORMAT_SETPIXEL( Format )

#define IMPL_FORMAT_GETPIXEL( Format ) \
BitmapColor BitmapReadAccess::GetPixelFor##Format( ConstScanline pScanline, long nX, const ColorMask& rMask )

#define IMPL_FORMAT_GETPIXEL_NOMASK( Format ) \
BitmapColor BitmapReadAccess::GetPixelFor##Format( ConstScanline pScanline, long nX, const ColorMask& )

#define IMPL_FORMAT_SETPIXEL( Format ) \
void BitmapReadAccess::SetPixelFor##Format( Scanline pScanline, long nX, const BitmapColor& rBitmapColor, const ColorMask& rMask )

#define IMPL_FORMAT_SETPIXEL_NOMASK( Format ) \
void BitmapReadAccess::SetPixelFor##Format( Scanline pScanline, long nX, const BitmapColor& rBitmapColor, const ColorMask& )

#define CASE_FORMAT( Format )           \
case( BMP_FORMAT##Format ):            \
{                                       \
    mFncGetPixel = GetPixelFor##Format;\
    mFncSetPixel = SetPixelFor##Format;\
}                                       \
break;



// - Access functions -


typedef BitmapColor (*FncGetPixel)( ConstScanline pScanline, long nX, const ColorMask& rMask );
typedef void (*FncSetPixel)( Scanline pScanline, long nX, const BitmapColor& rBitmapColor, const ColorMask& rMask );


// - BitmapReadAccess -


class VCL_DLLPUBLIC BitmapReadAccess
{
    friend class BitmapWriteAccess;

private:

                                BitmapReadAccess() {}
                                BitmapReadAccess( const BitmapReadAccess& ) {}
    BitmapReadAccess&           operator=( const BitmapReadAccess& ) { return *this; }

protected:
    Bitmap                      maBitmap;
    BitmapBuffer*               mpBuffer;
    Scanline*                   mpScanBuf;
    ColorMask                   maColorMask;
    FncGetPixel                 mFncGetPixel;
    FncSetPixel                 mFncSetPixel;
    bool                        mbModify;


SAL_DLLPRIVATE  void            ImplCreate( Bitmap& rBitmap );
SAL_DLLPRIVATE  void            ImplDestroy();
SAL_DLLPRIVATE  bool            ImplSetAccessPointers( sal_uLong nFormat );

public:

SAL_DLLPRIVATE  void            ImplZeroInitUnusedBits();
SAL_DLLPRIVATE  BitmapBuffer*   ImplGetBitmapBuffer() const { return mpBuffer; }

                                DECL_FORMAT( _1BIT_MSB_PAL )
                                DECL_FORMAT( _1BIT_LSB_PAL )
                                DECL_FORMAT( _4BIT_MSN_PAL )
                                DECL_FORMAT( _4BIT_LSN_PAL )
                                DECL_FORMAT( _8BIT_PAL )
                                DECL_FORMAT( _8BIT_TC_MASK )
                                DECL_FORMAT( _16BIT_TC_MSB_MASK )
                                DECL_FORMAT( _16BIT_TC_LSB_MASK )
                                DECL_FORMAT( _24BIT_TC_BGR )
                                DECL_FORMAT( _24BIT_TC_RGB )
                                DECL_FORMAT( _24BIT_TC_MASK )
                                DECL_FORMAT( _32BIT_TC_ABGR )
                                DECL_FORMAT( _32BIT_TC_ARGB )
                                DECL_FORMAT( _32BIT_TC_BGRA )
                                DECL_FORMAT( _32BIT_TC_RGBA )
                                DECL_FORMAT( _32BIT_TC_MASK )
protected:
                                BitmapReadAccess( Bitmap& rBitmap, bool bModify );

public:
                                BitmapReadAccess( Bitmap& rBitmap );
    virtual                     ~BitmapReadAccess();

    inline bool                 operator!() const;

    inline long                 Width() const;
    inline long                 Height() const;
    inline Point                TopLeft() const;
    inline Point                BottomRight() const;

    inline bool                 IsTopDown() const;
    inline bool                 IsBottomUp() const;

    inline sal_uLong                GetScanlineFormat() const;
    inline sal_uLong                GetScanlineSize() const;

    inline sal_uInt16               GetBitCount() const;
    inline BitmapColor          GetBestMatchingColor( const BitmapColor& rBitmapColor );

    inline Scanline             GetBuffer() const;
    inline Scanline             GetScanline( long nY ) const;

    inline bool                 HasPalette() const;
    inline const BitmapPalette& GetPalette() const;
    inline sal_uInt16               GetPaletteEntryCount() const;
    inline const BitmapColor&   GetPaletteColor( sal_uInt16 nColor ) const;
    inline const BitmapColor&   GetBestPaletteColor( const BitmapColor& rBitmapColor ) const;
    sal_uInt16                      GetBestPaletteIndex( const BitmapColor& rBitmapColor ) const;

    inline bool                 HasColorMask() const;
    inline ColorMask&           GetColorMask() const;

    inline BitmapColor          GetPixelFromData( const sal_uInt8* pData, long nX ) const;
    inline void                 SetPixelOnData( sal_uInt8* pData, long nX, const BitmapColor& rBitmapColor );
    inline BitmapColor          GetPixel( long nY, long nX ) const;
    inline BitmapColor          GetColor( long nY, long nX ) const;
    inline sal_uInt8            GetPixelIndex( long nY, long nX ) const;
    inline sal_uInt8            GetLuminance( long nY, long nX ) const;

    /** Get the interpolated color at coordinates fY, fX; if outside, return rFallback */
    BitmapColor GetInterpolatedColorWithFallback( double fY, double fX, const BitmapColor& rFallback ) const;

    /** Get the color at coordinates fY, fX; if outside, return rFallback. Automatically does the correct
        inside/outside checks, e.g. static_cast< sal_uInt32 >(-0.25) *is* 0, not -1 and has to be outside */
    BitmapColor GetColorWithFallback( double fY, double fX, const BitmapColor& rFallback ) const;
};


// - BitmapWriteAccess -


class VCL_DLLPUBLIC BitmapWriteAccess : public BitmapReadAccess
{
public:

                                BitmapWriteAccess( Bitmap& rBitmap );
    virtual                     ~BitmapWriteAccess();

    void                        CopyScanline( long nY, const BitmapReadAccess& rReadAcc );
    void                        CopyScanline( long nY, ConstScanline aSrcScanline,
                                              sal_uLong nSrcScanlineFormat, sal_uLong nSrcScanlineSize );

    void                        CopyBuffer( const BitmapReadAccess& rReadAcc );

    inline void                 SetPalette( const BitmapPalette& rPalette );
    inline void                 SetPaletteEntryCount( sal_uInt16 nCount );
    inline void                 SetPaletteColor( sal_uInt16 nColor, const BitmapColor& rBitmapColor );

    inline void                 SetPixel( long nY, long nX, const BitmapColor& rBitmapColor );
    inline void                 SetPixelIndex( long nY, long nX, sal_uInt8 cIndex );

    void                        SetLineColor( const Color& rColor );

    void                        SetFillColor( const Color& rColor );

    void                        Erase( const Color& rColor );

    void                        DrawLine( const Point& rStart, const Point& rEnd );

    void                        FillRect( const Rectangle& rRect );
    void                        DrawRect( const Rectangle& rRect );

private:

    BitmapColor*                mpLineColor;
    BitmapColor*                mpFillColor;

                                BitmapWriteAccess() {}
                                BitmapWriteAccess( const BitmapWriteAccess& ) : BitmapReadAccess() {}
    BitmapWriteAccess&          operator=( const BitmapWriteAccess& ) { return *this; }
};


// - Inlines -


inline bool BitmapReadAccess::operator!() const
{
    return( mpBuffer == NULL );
}



inline long BitmapReadAccess::Width() const
{
    return( mpBuffer ? mpBuffer->mnWidth : 0L );
}



inline long BitmapReadAccess::Height() const
{
    return( mpBuffer ? mpBuffer->mnHeight : 0L );
}



inline Point BitmapReadAccess::TopLeft() const
{
    return Point();
}



inline Point BitmapReadAccess::BottomRight() const
{
    return Point( Width() - 1L, Height() - 1L );
}



inline bool BitmapReadAccess::IsTopDown() const
{
    DBG_ASSERT( mpBuffer, "Access is not valid!" );
    return mpBuffer && ( BMP_SCANLINE_ADJUSTMENT( mpBuffer->mnFormat ) == BMP_FORMAT_TOP_DOWN );
}



inline bool BitmapReadAccess::IsBottomUp() const
{
    return !IsTopDown();
}



inline sal_uLong BitmapReadAccess::GetScanlineFormat() const
{
    DBG_ASSERT( mpBuffer, "Access is not valid!" );
    return( mpBuffer ? BMP_SCANLINE_FORMAT( mpBuffer->mnFormat ) : 0UL );
}



inline sal_uLong BitmapReadAccess::GetScanlineSize() const
{
    DBG_ASSERT( mpBuffer, "Access is not valid!" );
    return( mpBuffer ? mpBuffer->mnScanlineSize : 0UL );
}



inline sal_uInt16  BitmapReadAccess::GetBitCount() const
{
    DBG_ASSERT( mpBuffer, "Access is not valid!" );
    return( mpBuffer ? mpBuffer->mnBitCount : 0 );
}



inline BitmapColor BitmapReadAccess::GetBestMatchingColor( const BitmapColor& rBitmapColor )
{
    if( HasPalette() )
        return BitmapColor( (sal_uInt8) GetBestPaletteIndex( rBitmapColor ) );
    else
        return rBitmapColor;
}



inline Scanline BitmapReadAccess::GetBuffer() const
{
    DBG_ASSERT( mpBuffer, "Access is not valid!" );
    return( mpBuffer ? mpBuffer->mpBits : NULL );
}



inline Scanline BitmapReadAccess::GetScanline( long nY ) const
{
    DBG_ASSERT( mpBuffer, "Access is not valid!" );
    DBG_ASSERT( nY < mpBuffer->mnHeight, "y-coordinate out of range!" );
    return( mpBuffer ? mpScanBuf[ nY ] : NULL );
}



inline bool BitmapReadAccess::HasPalette() const
{
    DBG_ASSERT( mpBuffer, "Access is not valid!" );
    return( mpBuffer && !!mpBuffer->maPalette );
}



inline const BitmapPalette& BitmapReadAccess::GetPalette() const
{
    DBG_ASSERT( mpBuffer, "Access is not valid!" );
    return mpBuffer->maPalette;
}



inline sal_uInt16 BitmapReadAccess::GetPaletteEntryCount() const
{
    DBG_ASSERT( HasPalette(), "Bitmap has no palette!" );
    return( HasPalette() ? mpBuffer->maPalette.GetEntryCount() : 0 );
}



inline const BitmapColor& BitmapReadAccess::GetPaletteColor( sal_uInt16 nColor ) const
{
    DBG_ASSERT( mpBuffer, "Access is not valid!" );
    DBG_ASSERT( HasPalette(), "Bitmap has no palette!" );
    return mpBuffer->maPalette[ nColor ];
}



inline const BitmapColor& BitmapReadAccess::GetBestPaletteColor( const BitmapColor& rBitmapColor ) const
{
    return GetPaletteColor( GetBestPaletteIndex( rBitmapColor ) );
}



inline bool BitmapReadAccess::HasColorMask() const
{
    DBG_ASSERT( mpBuffer, "Access is not valid!" );
    const sal_uLong nFormat = BMP_SCANLINE_FORMAT( mpBuffer->mnFormat );

    return( nFormat == BMP_FORMAT_8BIT_TC_MASK  ||
            nFormat == BMP_FORMAT_16BIT_TC_MSB_MASK ||
            nFormat == BMP_FORMAT_16BIT_TC_LSB_MASK ||
            nFormat == BMP_FORMAT_24BIT_TC_MASK ||
            nFormat == BMP_FORMAT_32BIT_TC_MASK );
}



inline ColorMask& BitmapReadAccess::GetColorMask() const
{
    DBG_ASSERT( mpBuffer, "Access is not valid!" );
    return mpBuffer->maColorMask;
}



inline BitmapColor BitmapReadAccess::GetPixel( long nY, long nX ) const
{
    DBG_ASSERT( mpBuffer, "Access is not valid!" );
    DBG_ASSERT( nX < mpBuffer->mnWidth, "x-coordinate out of range!" );
    DBG_ASSERT( nY < mpBuffer->mnHeight, "y-coordinate out of range!" );
    return mFncGetPixel( mpScanBuf[ nY ], nX, maColorMask );
}

inline sal_uInt8 BitmapReadAccess::GetPixelIndex( long nY, long nX ) const
{
    return GetPixel( nY, nX ).GetBlueOrIndex();
}



inline BitmapColor BitmapReadAccess::GetPixelFromData( const sal_uInt8* pData, long nX ) const
{
    DBG_ASSERT( pData, "Access is not valid!" );
    return mFncGetPixel( pData, nX, maColorMask );
}



inline void BitmapReadAccess::SetPixelOnData( sal_uInt8* pData, long nX, const BitmapColor& rBitmapColor )
{
    DBG_ASSERT( pData, "Access is not valid!" );
    mFncSetPixel( pData, nX, rBitmapColor, maColorMask );
}



inline BitmapColor BitmapReadAccess::GetColor( long nY, long nX ) const
{
    if( HasPalette() )
        return mpBuffer->maPalette[ GetPixelIndex( nY, nX ) ];
    else
        return GetPixel( nY, nX );
}



inline sal_uInt8 BitmapReadAccess::GetLuminance( long nY, long nX ) const
{
    return GetColor( nY, nX ).GetLuminance();
}



inline void BitmapWriteAccess::SetPalette( const BitmapPalette& rPalette )
{
    DBG_ASSERT( mpBuffer, "Access is not valid!" );
    mpBuffer->maPalette = rPalette;
}



inline void BitmapWriteAccess::SetPaletteEntryCount( sal_uInt16 nCount )
{
    DBG_ASSERT( mpBuffer, "Access is not valid!" );
    mpBuffer->maPalette.SetEntryCount( nCount );
}



inline void BitmapWriteAccess::SetPaletteColor( sal_uInt16 nColor, const BitmapColor& rBitmapColor )
{
    DBG_ASSERT( mpBuffer, "Access is not valid!" );
    DBG_ASSERT( HasPalette(), "Bitmap has no palette!" );
    mpBuffer->maPalette[ nColor ] = rBitmapColor;
}



inline void BitmapWriteAccess::SetPixel( long nY, long nX, const BitmapColor& rBitmapColor )
{
    DBG_ASSERT( mpBuffer, "Access is not valid!" );
    DBG_ASSERT( nX < mpBuffer->mnWidth, "x-coordinate out of range!" );
    DBG_ASSERT( nY < mpBuffer->mnHeight, "y-coordinate out of range!" );
    mFncSetPixel( mpScanBuf[ nY ], nX, rBitmapColor, maColorMask );
}

inline void BitmapWriteAccess::SetPixelIndex( long nY, long nX, sal_uInt8 cIndex )
{
    SetPixel( nY, nX, BitmapColor( cIndex ));
}



#endif // INCLUDED_VCL_BMPACC_HXX

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