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GammaRamp.cpp
146 lines (114 loc) · 2.41 KB
/
GammaRamp.cpp
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// GammaRamp.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include <conio.h>
#include "GammaRamp.h"
CGammaRamp::CGammaRamp() :
hGDI32(NULL),
hScreenDC(NULL),
pGetDeviceGammaRamp(NULL),
pSetDeviceGammaRamp(NULL)
{
}
CGammaRamp::~CGammaRamp()
{
FreeLibrary();
}
BOOL CGammaRamp::LoadLibrary()
{
BOOL bReturn = FALSE;
FreeLibrary();
hGDI32 = ::LoadLibrary(_T("gdi32.dll"));
if (hGDI32 != NULL)
{
pGetDeviceGammaRamp = (LPFNSETDEVICEGAMMARAMP)GetProcAddress(hGDI32, "GetDeviceGammaRamp");
pSetDeviceGammaRamp =
(LPFNSETDEVICEGAMMARAMP)GetProcAddress(hGDI32, "SetDeviceGammaRamp");
if (pGetDeviceGammaRamp == NULL || pSetDeviceGammaRamp == NULL)
FreeLibrary();
else
bReturn = TRUE;
}
return bReturn;
}
void CGammaRamp::FreeLibrary()
{
if (hGDI32 != NULL)
{
::FreeLibrary(hGDI32);
hGDI32 = NULL;
}
}
BOOL CGammaRamp::LoadLibraryIfNeeded()
{
BOOL bReturn = FALSE;
if (hGDI32 == NULL)
LoadLibrary();
if (pGetDeviceGammaRamp != NULL && pSetDeviceGammaRamp != NULL)
bReturn = TRUE;
return bReturn;
}
BOOL CGammaRamp::SetDeviceGammaRamp(HDC hDC, LPVOID lpRamp)
{
if (LoadLibraryIfNeeded())
return pSetDeviceGammaRamp(hDC, lpRamp);
else
return FALSE;
}
BOOL CGammaRamp::GetDeviceGammaRamp(HDC hDC, LPVOID lpRamp)
{
if (LoadLibraryIfNeeded())
return pGetDeviceGammaRamp(hDC, lpRamp);
else
return FALSE;
}
BOOL CGammaRamp::SetBrightness(WORD wBrightness, HDC hDC)
{
BOOL bReturn = FALSE;
HDC hGammaDC = hDC;
if (hDC == NULL)
hGammaDC = GetDC(NULL);
if (hGammaDC != NULL)
{
WORD GammaArray[3][256];
for (int iIndex = 0; iIndex < 256; iIndex++)
{
int iArrayValue = iIndex * (wBrightness + 128);
if (iArrayValue > 65535)
iArrayValue = 65535;
GammaArray[0][iIndex] =
GammaArray[1][iIndex] =
GammaArray[2][iIndex] = (WORD)iArrayValue;
}
bReturn = SetDeviceGammaRamp(hGammaDC, GammaArray);
}
if (hDC == NULL)
ReleaseDC(NULL, hGammaDC);
return bReturn;
}
int _tmain(int argc, _TCHAR* argv[])
{
CGammaRamp GammaRamp;
WORD wBrightness = 128;
BOOL bDone = FALSE;
while (!bDone)
{
switch (::_getch())
{
case 72:
GammaRamp.SetBrightness(++wBrightness);
break;
case 80:
GammaRamp.SetBrightness(--wBrightness);
break;
case 'q':
case 'Q':
bDone = TRUE;
break;
default:
break;
}
::_tprintf(_T("\r \r%ld"), wBrightness);
}
return 0;
}