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/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
*
* This 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 software 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 software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
// -=- DeviceFrameBuffer.h
//
// The DeviceFrameBuffer class encapsulates the pixel data of a supplied
// Device Context Handle (HDC)
// *** THIS INTERFACE NEEDS TIDYING TO SEPARATE COORDINATE SYSTEMS BETTER ***
#ifndef __RFB_WIN32_DEVICE_FRAME_BUFFER_H__
#define __RFB_WIN32_DEVICE_FRAME_BUFFER_H__
#include <windows.h>
#include <rfb_win32/DIBSectionBuffer.h>
#include <rfb/Cursor.h>
#include <rfb/Region.h>
#include <rfb/Exception.h>
#include <rfb/Configuration.h>
namespace rfb {
class VNCServer;
namespace win32 {
// -=- DeviceFrameBuffer interface
// DeviceFrameBuffer is passed an HDC referring to a window or to
// the entire display. It may also be passed a rectangle specifying
// the Device-relative coordinates of the actual rectangle to treat
// as the desktop.
// Coordinate systems start getting really annoying here. There are
// three different "origins" to which coordinates might be relative:
//
// Desktop - VNC coordinates, top-left always (0,0)
// Device - DC coordinates. Top-left *usually (0,0) but could be other.
// Window - coordinates relative to the specified sub-rectangle within
// the supplied DC.
// Screen - Coordinates relative to the entire Windows virtual screen.
// The virtual screen includes all monitors that are part of
// the Windows desktop.
// The data member is made to point to an internal mirror of the
// current display data. Individual rectangles or regions of the
// buffer can be brought up to date by calling the grab functions.
class DeviceFrameBuffer : public DIBSectionBuffer {
public:
DeviceFrameBuffer(HDC deviceContext, const Rect& area_=Rect());
virtual ~DeviceFrameBuffer();
// - FrameBuffer overrides
virtual void grabRect(const Rect &rect);
virtual void grabRegion(const Region ®ion);
// - DeviceFrameBuffer specific methods
void setCursor(HCURSOR c, VNCServer* server);
// Set whether grabRect should ignore errors or throw exceptions
// Only set this if you are sure you'll capture the errors some other way!
void setIgnoreGrabErrors(bool ie) {ignoreGrabErrors=ie;}
static BoolParameter useCaptureBlt;
protected:
// Translate supplied Desktop coordinates into Device-relative coordinates
// This translation may have been affected at start-time by the supplied sub-rect.
Point desktopToDevice(const Point p) const {return p.translate(deviceCoords.tl);}
HDC device;
Rect deviceCoords;
bool ignoreGrabErrors;
};
};
};
#endif // __RFB_WIN32_DEVICE_FRAME_BUFFER_H__
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