salbmp.hxx

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 *   Licensed to the Apache Software Foundation (ASF) under one or more
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#ifndef INCLUDED_VCL_INC_SALBMP_HXX
#define INCLUDED_VCL_INC_SALBMP_HXX

#include <tools/gen.hxx>
#include <tools/solar.h>
#include <vcl/checksum.hxx>
#include <vcl/BitmapAccessMode.hxx>
#include <vcl/BitmapBuffer.hxx>
#include <com/sun/star/rendering/XBitmapCanvas.hpp>

struct BitmapBuffer;
class Color;
class SalGraphics;
class BitmapPalette;
struct BitmapSystemData;
enum class BmpScaleFlag;

extern const sal_uLong nVCLRLut[ 6 ];
extern const sal_uLong nVCLGLut[ 6 ];
extern const sal_uLong nVCLBLut[ 6 ];
extern const sal_uLong nVCLDitherLut[ 256 ];
extern const sal_uLong nVCLLut[ 256 ];

class VCL_PLUGIN_PUBLIC SalBitmap
{
public:

    SalBitmap()
        : mnChecksum(0)
        , mbChecksumValid(false)
    {
    }

    virtual                 ~SalBitmap();

    virtual bool            Create( const Size& rSize,
                                    sal_uInt16 nBitCount,
                                    const BitmapPalette& rPal ) = 0;
    virtual bool            Create( const SalBitmap& rSalBmp ) = 0;
    virtual bool            Create( const SalBitmap& rSalBmp,
                                    SalGraphics* pGraphics ) = 0;
    virtual bool            Create( const SalBitmap& rSalBmp,
                                    sal_uInt16 nNewBitCount ) = 0;
    virtual bool            Create( const css::uno::Reference< css::rendering::XBitmapCanvas >& rBitmapCanvas,
                                    Size& rSize,
                                    bool bMask = false ) = 0;
    virtual void            Destroy() = 0;
    virtual Size            GetSize() const = 0;
    virtual sal_uInt16      GetBitCount() const = 0;

    virtual BitmapBuffer*   AcquireBuffer( BitmapAccessMode nMode ) = 0;
    virtual void            ReleaseBuffer( BitmapBuffer* pBuffer, BitmapAccessMode nMode ) = 0;
    virtual bool            GetSystemData( BitmapSystemData& rData ) = 0;

    virtual bool            ScalingSupported() const = 0;
    virtual bool            Scale( const double& rScaleX, const double& rScaleY, BmpScaleFlag nScaleFlag ) = 0;
    void                    DropScaledCache();

    virtual bool            Replace( const Color& rSearchColor, const Color& rReplaceColor, sal_uInt8 nTol ) = 0;

    virtual bool            ConvertToGreyscale()
    {
        return false;
    }
    virtual bool            InterpretAs8Bit()
    {
        return false;
    }

    virtual bool            Erase( const Color& /*color*/ )
    {
        return false;
    }
    // Optimized case for AlphaMask::BlendWith().
    virtual bool            AlphaBlendWith( const SalBitmap& /*rSalBmp*/ )
    {
        return false;
    }

    void GetChecksum(BitmapChecksum& rChecksum) const
    {
        updateChecksum();
        if (!mbChecksumValid)
            rChecksum = 0; // back-compat
        else
            rChecksum = mnChecksum;
    }

    void InvalidateChecksum()
    {
        mbChecksumValid = false;
    }

protected:
    BitmapChecksum mnChecksum;
    bool           mbChecksumValid;

protected:
    void updateChecksum() const;
    // helper function to convert data in 1,2,4 bpp formats to a 8/24/32bpp format
    enum class BitConvert
    {
        A8,
        RGBA,
        BGRA,
        LAST = BGRA
    };
    static std::unique_ptr< sal_uInt8[] > convertDataBitCount( const sal_uInt8* src,
        int width, int height, int bitCount, int bytesPerRow, const BitmapPalette& palette,
        BitConvert type );
};

#endif

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