vistaenhancements.cpp

teamviewer source code vc++

#include "stdhdrs.h"
#include "VistaEnhancements.h"

CVistaEnhancements::CVistaEnhancements(void)
{
	library_dwmapi = NULL;
	m_isCompositionEnabled = NULL;
	m_EnableComposition = NULL;

	// try to load the desktop window manager api
	library_dwmapi = ::LoadLibrary("dwmapi.dll");
	if(library_dwmapi)
	{
		m_EnableComposition = (DwmEnableCompositionFn)GetProcAddress(library_dwmapi, "DwmEnableComposition");
		m_isCompositionEnabled = (DwmIsCompositionEnabledFn)GetProcAddress(library_dwmapi, "DwmIsCompositionEnabled");
	}
	orig_composition = isCompositionEnabled();
}

CVistaEnhancements::~CVistaEnhancements(void)
{
	setComposition(orig_composition);
	FreeLibrary(library_dwmapi);
}

bool CVistaEnhancements::isLoaded_dwmapi()
{
	return m_isCompositionEnabled && m_EnableComposition;
}

bool CVistaEnhancements::isCompositionEnabled()
{
    if (!m_isCompositionEnabled)					// do nothing if DwmIsCompositionEnabled() is not known
		return false;

	BOOL enabled = FALSE;
	return SUCCEEDED(m_isCompositionEnabled(&enabled)) && enabled;
}

bool CVistaEnhancements::setComposition(bool doEnable)
{
	if (!m_EnableComposition)						// do nothing if DwmEnableComposition() is not known
		return false;

	doEnable = true;
	return m_EnableComposition(doEnable ? DWM_EC_ENABLECOMPOSITION : DWM_EC_DISABLECOMPOSITION);
}