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/* -*- Mode: C++; indent-tabs-mode: t; c-basic-offset: 4; tab-width: 4 -*- */
/*
* CCITTFax4Encoder.hh
* Based on code from libtiff/tif_fax3.c, which is:
* Copyright (c) 1990-1997 Sam Leffler
* Copyright (c) 1991-1997 Silicon Graphics, Inc.
* Permission to use, copy, modify, distribute, and sell this software and
* its documentation for any purpose is hereby granted without fee, provided
* that (i) the above copyright notices and this permission notice appear in
* all copies of the software and related documentation, and (ii) the names of
* Sam Leffler and Silicon Graphics may not be used in any advertising or
* publicity relating to the software without the specific, prior written
* permission of Sam Leffler and Silicon Graphics.
*
* Modifications are:
* Copyright (C) 2016-2020 Sandro Mani <manisandro@gmail.com>
*
* gImageReader is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* gImageReader is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef FAX4ENCODER_HH
#define FAX4ENCODER_HH
#include <cstdint>
class CCITTFax4Encoder {
public:
CCITTFax4Encoder();
~CCITTFax4Encoder();
uint8_t* encode(const uint8_t* buffer, uint32_t width, uint32_t height, uint32_t rowbytes, uint32_t& outputSize);
private:
struct EncoderState;
struct TableEntry;
EncoderState* m_state;
void encode2DRow(const uint8_t* codeline, const uint8_t* refline, uint32_t linebits);
inline void putspan(int32_t span, const TableEntry* tab);
inline void putbits(uint16_t bits, uint16_t length);
inline void flushbits();
static const TableEntry whiteCodes[];
static const TableEntry blackCodes[];
static const TableEntry horizcode;
static const TableEntry passcode;
static const TableEntry vcodes[];
};
#endif // CCITT_HH
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