106 lines
3.6 KiB
C++
106 lines
3.6 KiB
C++
// Copyright (C) 2000 Tridia Corporation. All Rights Reserved.
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// Copyright (C) 1999 AT&T Laboratories Cambridge. All Rights Reserved.
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//
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// This file is part of the VNC system.
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//
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// The VNC system is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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// USA.
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//
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// TightVNC distribution homepage on the Web: http://www.tightvnc.com/
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//
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// If the source code for the VNC system is not available from the place
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// whence you received this file, check http://www.uk.research.att.com/vnc or contact
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// the authors on vnc@uk.research.att.com for information on obtaining it.
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// vncEncodeZlibHex object
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// The vncEncodeZlibHex object uses a compression encoding to send rectangles
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// to a client. As with the hextile encoding, all rectangles are broken down
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// into a matrix of 16x16 (or smaller at bottom/right) tiles, which are
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// individually encoded with a subencoding mechanism. This encoding addds
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// the ability to apply zlib compression to the raw and other hextile
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// subencodings.
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class vncEncodeZlibHex;
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#if !defined(_WINVNC_ENCODEZLIBHEX)
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#define _WINVNC_ENCODEZLIBHEX
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#pragma once
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#include "vncEncoder.h"
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#include "zlib/zlib.h"
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// Minimum zlib rectangle size in bytes. Anything smaller will
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// not compress well due to overhead.
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#define VNC_ENCODE_ZLIBHEX_MIN_COMP_SIZE (17)
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// Flag used to mark our compressors as uninitialized.
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#define ZLIBHEX_COMP_UNINITED (-1)
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// Size of the smallest update portion sent independently across
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// the network. This encoder can transmit partial updates to
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// improve latency issues with performance.
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#define VNC_ENCODE_ZLIBHEX_MIN_DATAXFER (1400)
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// Class definition
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class vncEncodeZlibHex : public vncEncoder
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{
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// Fields
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public:
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// Methods
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public:
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// Create/Destroy methods
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vncEncodeZlibHex();
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~vncEncodeZlibHex();
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void Init();
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virtual const char* GetEncodingName() { return "ZlibHex"; }
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virtual UINT RequiredBuffSize(UINT width, UINT height);
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virtual UINT NumCodedRects(RECT &rect);
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// virtual UINT EncodeRect(BYTE *source, BYTE *dest, const RECT &rect);
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virtual UINT EncodeRect(BYTE *source, VSocket *outConn, BYTE *dest, const RECT &rect, int offx, int offy);
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//virtual VOID UpdateZLibDictionary( AGENT_CTX * lpAgentContext );
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//virtual VOID DumpZLibDictionary( AGENT_CTX * lpAgentContext );
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protected:
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virtual UINT zlibCompress(BYTE *from_buf, BYTE *to_buf, UINT length, struct z_stream_s *compressor);
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virtual UINT EncodeHextiles8(BYTE *source, BYTE *dest,
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VSocket *outConn, int x, int y, int w, int h);
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virtual UINT EncodeHextiles16(BYTE *source, BYTE *dest,
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VSocket *outConn, int x, int y, int w, int h);
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virtual UINT EncodeHextiles32(BYTE *source, BYTE *dest,
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VSocket *outConn, int x, int y, int w, int h);
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// Implementation
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protected:
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BYTE *m_buffer;
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int m_bufflen;
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int offsetx;
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int offsety;
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struct z_stream_s compStreamRaw;
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struct z_stream_s compStreamEncoded;
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};
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#endif // _WINVNC_ENCODEHEXTILE
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