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       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 _IPDF_PNGHELPER_HXX
      21                 :            : #define _IPDF_PNGHELPER_HXX
      22                 :            : 
      23                 :            : #include "sal/types.h"
      24                 :            : #include "pdfioutdev_gpl.hxx"
      25                 :            : 
      26                 :            : 
      27                 :            : namespace pdfi
      28                 :            : {
      29                 :            :     class PngHelper
      30                 :            :     {
      31                 :            :         static sal_uInt32 crc_table[ 256 ];
      32                 :            :         static bool bCRCTableInit;
      33                 :            : 
      34                 :            :         static void initCRCTable();
      35                 :            :         static void appendFileHeader( OutputBuffer& o_rOutputBuf );
      36                 :            :         static size_t startChunk( const char* pChunkName, OutputBuffer& o_rOut );
      37                 :            :         static void endChunk( size_t nStart, OutputBuffer& o_rOut );
      38                 :            : 
      39                 :            :         static void set( sal_uInt32 i_nValue, OutputBuffer& o_rOutputBuf, size_t i_nIndex );
      40                 :          0 :         static void append( sal_uInt32 i_nValue, OutputBuffer& o_rOutputBuf )
      41                 :            :         {
      42                 :          0 :             size_t nCur = o_rOutputBuf.size();
      43         [ #  # ]:          0 :             o_rOutputBuf.insert( o_rOutputBuf.end(), 4, (Output_t)0 );
      44                 :          0 :             set( i_nValue, o_rOutputBuf, nCur );
      45                 :          0 :         }
      46                 :            : 
      47                 :            :         static void appendIHDR( OutputBuffer& o_rOutputBuf, int width, int height, int depth, int colortype );
      48                 :            :         static void appendIEND( OutputBuffer& o_rOutputBuf );
      49                 :            : 
      50                 :            :     public:
      51                 :            :         static void updateCRC( sal_uInt32& io_rCRC, const sal_uInt8* i_pBuf, size_t i_nLen );
      52                 :            :         static sal_uInt32 getCRC( const sal_uInt8* i_pBuf, size_t i_nLen );
      53                 :            : 
      54                 :            :         // deflates the passed buff i_pBuf and appends it to the output vector
      55                 :            :         // returns the number of bytes added to the output
      56                 :            :         static sal_uInt32 deflateBuffer( const Output_t* i_pBuf, size_t i_nLen, OutputBuffer& o_rOut );
      57                 :            : 
      58                 :            :         static void createPng( OutputBuffer&     o_rOutputBuf,
      59                 :            :                                Stream*           str,
      60                 :            :                                int               width,
      61                 :            :                                int               height,
      62                 :            :                                GfxRGB&           zeroColor,
      63                 :            :                                GfxRGB&           oneColor,
      64                 :            :                                bool              bIsMask
      65                 :            :                                );
      66                 :            :         static void createPng( OutputBuffer& o_rOutputBuf,
      67                 :            :                                Stream* str,
      68                 :            :                                int width, int height, GfxImageColorMap* colorMap,
      69                 :            :                                Stream* maskStr,
      70                 :            :                                int maskWidth, int maskHeight, GfxImageColorMap* maskColorMap );
      71                 :            : 
      72                 :            :         // for one bit masks
      73                 :            :         static void createPng( OutputBuffer& o_rOutputBuf,
      74                 :            :                                Stream* str,
      75                 :            :                                int width, int height, GfxImageColorMap* colorMap,
      76                 :            :                                Stream* maskStr,
      77                 :            :                                int maskWidth, int maskHeight, bool maskInvert );
      78                 :            : 
      79                 :            :     };
      80                 :            : }
      81                 :            : 
      82                 :            : #endif
      83                 :            : 
      84                 :            : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */