vcl/source/filter/jpeg/Exif.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #pragma once
  21
  22 #include <tools/stream.hxx>
  23 #include <tools/degree.hxx>
  24
  25 namespace exif {
  26
  27 enum Orientation {
  28     TOP_LEFT        = 1,
  29     TOP_RIGHT       = 2,
  30     BOTTOM_RIGHT    = 3,
  31     BOTTOM_LEFT     = 4,
  32     LEFT_TOP        = 5,
  33     RIGHT_TOP       = 6,
  34     RIGHT_BOTTOM    = 7,
  35     LEFT_BOTTOM     = 8
  36 };
  37 };
  38
  39 enum Tag {
  40     ORIENTATION         = 0x0112
  41 };
  42
  43 class Exif final
  44 {
  45 private:
  46     exif::Orientation maOrientation;
  47     bool mbExifPresent;
  48
  49     bool processJpeg(SvStream& rStream, bool bSetValue);
  50     bool processExif(SvStream& rStream, sal_uInt16 aLength, bool bSetValue);
  51     void processIFD(sal_uInt8* pExifData, sal_uInt16 aLength, sal_uInt16 aOffset, sal_uInt16 aNumberOfTags, bool bSetValue, bool bLittleEndian);
  52
  53     struct ExifIFD {
  54         sal_uInt8 tag[2];
  55         sal_uInt8 type[2];
  56         sal_uInt8 count[4];
  57         sal_uInt8 offset[4];
  58     };
  59
  60     struct TiffHeader {
  61         sal_uInt16 byteOrder;
  62         sal_uInt16 tagAlign;
  63         sal_uInt32 offset;
  64     };
  65
  66     static exif::Orientation convertToOrientation(sal_Int32 value);
  67
  68 public:
  69     Exif();
  70
  71     bool hasExif() const { return mbExifPresent;}
  72
  73     exif::Orientation getOrientation() const { return maOrientation;}
  74     Degree10 getRotation() const;
  75
  76     void setOrientation(exif::Orientation orientation);
  77
  78     bool read(SvStream& rStream);
  79     void write(SvStream& rStream);
  80
  81 };
  82
  83 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */