90 lines
2.8 KiB
C++
90 lines
2.8 KiB
C++
// Copyright (C) 2000 Tridia Corporation. All Rights Reserved.
|
|
// Copyright (C) 1999 AT&T Laboratories Cambridge. All Rights Reserved.
|
|
//
|
|
// This file is part of the VNC system.
|
|
//
|
|
// The VNC system 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 2 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// This program 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, write to the Free Software
|
|
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
|
|
// USA.
|
|
//
|
|
// TightVNC distribution homepage on the Web: http://www.tightvnc.com/
|
|
//
|
|
// If the source code for the VNC system is not available from the place
|
|
// whence you received this file, check http://www.uk.research.att.com/vnc or contact
|
|
// the authors on vnc@uk.research.att.com for information on obtaining it.
|
|
|
|
|
|
// vncEncodeZlib object
|
|
|
|
// The vncEncodeZlib object uses a zlib based compression encoding to send rectangles
|
|
// to a client
|
|
|
|
class vncEncodeZlib;
|
|
|
|
#if !defined(_WINVNC_ENCODEZLIB)
|
|
#define _WINVNC_ENCODEZLIB
|
|
#pragma once
|
|
|
|
#include "vncEncoder.h"
|
|
|
|
#include "zlib/zlib.h"
|
|
|
|
// Minimum zlib rectangle size in bytes. Anything smaller will
|
|
// not compress well due to overhead.
|
|
#define VNC_ENCODE_ZLIB_MIN_COMP_SIZE (17)
|
|
|
|
// Set maximum zlib rectangle size in pixels. Always allow at least
|
|
// two scan lines.
|
|
#define ZLIB_MAX_RECT_SIZE (8*1024)
|
|
#define ZLIB_MAX_SIZE(min) ((( min * 2 ) > ZLIB_MAX_RECT_SIZE ) ? ( min * 2 ) : ZLIB_MAX_RECT_SIZE )
|
|
|
|
|
|
// Class definition
|
|
|
|
class vncEncodeZlib : public vncEncoder
|
|
{
|
|
// Fields
|
|
public:
|
|
|
|
// Methods
|
|
public:
|
|
// Create/Destroy methods
|
|
vncEncodeZlib();
|
|
~vncEncodeZlib();
|
|
|
|
virtual void Init();
|
|
virtual const char* GetEncodingName() { return "Zlib"; }
|
|
|
|
virtual UINT RequiredBuffSize(UINT width, UINT height);
|
|
virtual UINT NumCodedRects(RECT &rect);
|
|
|
|
virtual UINT EncodeRect(BYTE *source, VSocket *outConn, BYTE *dest, const RECT &rect, int offx, int offy);
|
|
virtual UINT EncodeOneRect(BYTE *source, BYTE *dest, const RECT &rect);
|
|
|
|
//virtual VOID UpdateZLibDictionary( AGENT_CTX * lpAgentContext );
|
|
//virtual VOID DumpZLibDictionary( AGENT_CTX * lpAgentContext );
|
|
|
|
// Implementation
|
|
protected:
|
|
BYTE *m_buffer;
|
|
int m_bufflen;
|
|
struct z_stream_s compStream;
|
|
bool compStreamInited;
|
|
int offsetx;
|
|
int offsety;
|
|
};
|
|
|
|
#endif // _WINVNC_ENCODEZLIB
|
|
|