Exif.hxx

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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#pragma once
 
#include <tools/stream.hxx>
#include <tools/degree.hxx>
 
namespace exif {
 
enum Orientation {
    TOP_LEFT        = 1,
    TOP_RIGHT       = 2,
    BOTTOM_RIGHT    = 3,
    BOTTOM_LEFT     = 4,
    LEFT_TOP        = 5,
    RIGHT_TOP       = 6,
    RIGHT_BOTTOM    = 7,
    LEFT_BOTTOM     = 8
};
};
 
enum Tag {
    ORIENTATION         = 0x0112
};
 
class Exif final
{
private:
    exif::Orientation maOrientation;
    bool mbExifPresent;
 
    bool processJpeg(SvStream& rStream, bool bSetValue);
    bool processExif(SvStream& rStream, sal_uInt16 aLength, bool bSetValue);
    void processIFD(sal_uInt8* pExifData, sal_uInt16 aLength, sal_uInt16 aOffset, sal_uInt16 aNumberOfTags, bool bSetValue, bool bLittleEndian);
 
    struct ExifIFD {
        sal_uInt8 tag[2];
        sal_uInt8 type[2];
        sal_uInt8 count[4];
        sal_uInt8 offset[4];
    };
 
    struct TiffHeader {
        sal_uInt16 byteOrder;
        sal_uInt16 tagAlign;
        sal_uInt32 offset;
    };
 
    static exif::Orientation convertToOrientation(sal_Int32 value);
 
public:
    Exif();
 
    bool hasExif() const { return mbExifPresent;}
 
    exif::Orientation getOrientation() const { return maOrientation;}
    Degree10 getRotation() const;
 
    void setOrientation(exif::Orientation orientation);
 
    bool read(SvStream& rStream);
    void write(SvStream& rStream);
 
};
 
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