vcl/source/filter/igif/gifread.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 #ifndef _GIFREAD_HXX
  21 #define _GIFREAD_HXX
  22
  23 #include <vcl/graph.hxx>
  24 #include <vcl/bmpacc.hxx>
  25
  26 #ifdef _GIFPRIVATE
  27
  28 enum GIFAction
  29 {
  30     GLOBAL_HEADER_READING,
  31     MARKER_READING,
  32     EXTENSION_READING,
  33     LOCAL_HEADER_READING,
  34     FIRST_BLOCK_READING,
  35     NEXT_BLOCK_READING,
  36     ABORT_READING,
  37     END_READING
  38 };
  39
  40 enum ReadState
  41 {
  42     GIFREAD_OK,
  43     GIFREAD_ERROR,
  44     GIFREAD_NEED_MORE
  45 };
  46
  47 class GIFLZWDecompressor;
  48
  49 class SvStream;
  50
  51 class GIFReader : public GraphicReader
  52 {
  53     Graphic             aImGraphic;
  54     Animation           aAnimation;
  55     Bitmap              aBmp8;
  56     Bitmap              aBmp1;
  57     BitmapPalette       aGPalette;
  58     BitmapPalette       aLPalette;
  59     SvStream&           rIStm;
  60     HPBYTE              pSrcBuf;
  61     GIFLZWDecompressor* pDecomp;
  62     BitmapWriteAccess*  pAcc8;
  63     BitmapWriteAccess*  pAcc1;
  64     long                nYAcc;
  65     long                nLastPos;
  66     sal_uInt32          nLogWidth100;
  67     sal_uInt32          nLogHeight100;
  68     sal_uInt16              nTimer;
  69     sal_uInt16              nGlobalWidth;           // maximale Bildbreite aus Header
  70     sal_uInt16              nGlobalHeight;          // maximale Bildhoehe aus Header
  71     sal_uInt16              nImageWidth;            // maximale Bildbreite aus Header
  72     sal_uInt16              nImageHeight;           // maximale Bildhoehe aus Header
  73     sal_uInt16              nImagePosX;
  74     sal_uInt16              nImagePosY;
  75     sal_uInt16              nImageX;                // maximale Bildbreite aus Header
  76     sal_uInt16              nImageY;                // maximale Bildhoehe aus Header
  77     sal_uInt16              nLastImageY;
  78     sal_uInt16              nLastInterCount;
  79     sal_uInt16              nLoops;
  80     GIFAction           eActAction;
  81     sal_Bool                bStatus;
  82     sal_Bool                bGCTransparent;         // Ob das Bild Transparent ist, wenn ja:
  83     sal_Bool                bInterlaced;
  84     sal_Bool                bOverreadBlock;
  85     sal_Bool                bImGraphicReady;
  86     sal_Bool                bGlobalPalette;
  87     sal_uInt8               nBackgroundColor;       // Hintergrundfarbe
  88     sal_uInt8               nGCTransparentIndex;    // Pixel von diesem Index sind durchsichtig
  89     sal_uInt8               nGCDisposalMethod;      // 'Disposal Method' (siehe GIF-Doku)
  90     sal_uInt8               cTransIndex1;
  91     sal_uInt8               cNonTransIndex1;
  92
  93     void                ReadPaletteEntries( BitmapPalette* pPal, sal_uLong nCount );
  94     void                ClearImageExtensions();
  95     sal_Bool                CreateBitmaps( long nWidth, long nHeight, BitmapPalette* pPal, sal_Bool bWatchForBackgroundColor );
  96     sal_Bool                ReadGlobalHeader();
  97     sal_Bool                ReadExtension();
  98     sal_Bool                ReadLocalHeader();
  99     sal_uLong               ReadNextBlock();
 100     void                FillImages( HPBYTE pBytes, sal_uLong nCount );
 101     void                CreateNewBitmaps();
 102     sal_Bool                ProcessGIF();
 103
 104 public:
 105
 106     ReadState           ReadGIF( Graphic& rGraphic );
 107     const Graphic&      GetIntermediateGraphic();
 108
 109                         GIFReader( SvStream& rStm );
 110     virtual             ~GIFReader();
 111 };
 112
 113 #endif // _GIFPRIVATE
 114
 115 sal_Bool ImportGIF( SvStream& rStream, Graphic& rGraphic );
 116
 117 #endif // _GIFREAD_HXX
 118
 119 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */