BitmapInfoAccess.hxx

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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#ifndef INCLUDED_VCL_BITMAPINFOACCESS_HXX
#define INCLUDED_VCL_BITMAPINFOACCESS_HXX
 
#include <vcl/dllapi.h>
#include <vcl/bitmap.hxx>
#include <vcl/Scanline.hxx>
#include <vcl/BitmapBuffer.hxx>
#include <vcl/BitmapColor.hxx>
#include <vcl/BitmapAccessMode.hxx>
 
bool Bitmap32IsPreMultipled();
 
typedef BitmapColor (*FncGetPixel)(ConstScanline pScanline, tools::Long nX, const ColorMask& rMask);
typedef void (*FncSetPixel)(Scanline pScanline, tools::Long nX, const BitmapColor& rBitmapColor,
                            const ColorMask& rMask);
 
class VCL_DLLPUBLIC BitmapInfoAccess
{
    friend class BitmapReadAccess;
 
public:
    BitmapInfoAccess(Bitmap& rBitmap, BitmapAccessMode nMode = BitmapAccessMode::Info);
    virtual ~BitmapInfoAccess();
 
    bool operator!() const { return mpBuffer == nullptr; }
 
    tools::Long Width() const { return mpBuffer ? mpBuffer->mnWidth : 0L; }
 
    tools::Long Height() const { return mpBuffer ? mpBuffer->mnHeight : 0L; }
 
    bool IsTopDown() const
    {
        assert(mpBuffer && "Access is not valid!");
 
        return mpBuffer && (mpBuffer->mnFormat & ScanlineFormat::TopDown);
    }
 
    bool IsBottomUp() const { return !IsTopDown(); }
 
    ScanlineFormat GetScanlineFormat() const
    {
        assert(mpBuffer && "Access is not valid!");
 
        return mpBuffer ? RemoveScanline(mpBuffer->mnFormat) : ScanlineFormat::NONE;
    }
 
    sal_uInt32 GetScanlineSize() const
    {
        assert(mpBuffer && "Access is not valid!");
 
        return mpBuffer ? mpBuffer->mnScanlineSize : 0;
    }
 
    sal_uInt16 GetBitCount() const
    {
        assert(mpBuffer && "Access is not valid!");
 
        return mpBuffer ? mpBuffer->mnBitCount : 0;
    }
 
    BitmapColor GetBestMatchingColor(const BitmapColor& rBitmapColor) const
    {
        if (HasPalette())
            return BitmapColor(static_cast<sal_uInt8>(GetBestPaletteIndex(rBitmapColor)));
        else
            return rBitmapColor;
    }
 
    bool HasPalette() const
    {
        const BitmapBuffer* pBuffer = mpBuffer;
 
        assert(pBuffer && "Access is not valid!");
 
        return pBuffer && !!pBuffer->maPalette;
    }
 
    const BitmapPalette& GetPalette() const
    {
        const BitmapBuffer* pBuffer = mpBuffer;
 
        assert(pBuffer && "Access is not valid!");
 
        return pBuffer->maPalette;
    }
 
    sal_uInt16 GetPaletteEntryCount() const
    {
        const BitmapBuffer* pBuffer = mpBuffer;
 
        assert(HasPalette() && "Bitmap has no palette!");
 
        return HasPalette() ? pBuffer->maPalette.GetEntryCount() : 0;
    }
 
    const BitmapColor& GetPaletteColor(sal_uInt16 nColor) const
    {
        const BitmapBuffer* pBuffer = mpBuffer;
        assert(pBuffer && "Access is not valid!");
        assert(HasPalette() && "Bitmap has no palette!");
 
        return pBuffer->maPalette[nColor];
    }
 
    sal_uInt16 GetBestPaletteIndex(const BitmapColor& rBitmapColor) const;
 
    const ColorMask& GetColorMask() const
    {
        const BitmapBuffer* pBuffer = mpBuffer;
 
        assert(pBuffer && "Access is not valid!");
 
        return pBuffer->maColorMask;
    }
 
private:
    BitmapInfoAccess(const BitmapInfoAccess&) = delete;
    BitmapInfoAccess& operator=(const BitmapInfoAccess&) = delete;
 
protected:
    Bitmap maBitmap;
    BitmapBuffer* mpBuffer;
    ColorMask maColorMask;
    BitmapAccessMode mnAccessMode;
};
 
#endif // INCLUDED_VCL_BITMAPINFOACCESS_HXX
 
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