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#include "main.h"
#include "dpi.h"
// DPI awareness based on http://msdn.microsoft.com/en-US/library/dd464660.aspx
// Definition: relative pixel = 1 pixel at 96 DPI and scaled based on actual DPI.
BOOL _fInitialized = FALSE;
int _dpiX = 96, _dpiY = 96;
void _Init()
{
if (!_fInitialized)
{
HDC hdc = GetDC(NULL);
if (hdc)
{
_dpiX = GetDeviceCaps(hdc, LOGPIXELSX);
_dpiY = GetDeviceCaps(hdc, LOGPIXELSY);
ReleaseDC(NULL, hdc);
}
_fInitialized = TRUE;
}
}
// Get screen DPI.
int GetDPIX()
{
_Init();
return _dpiX;
}
int GetDPIY()
{
_Init();
return _dpiY;
}
// Convert between raw pixels and relative pixels.
int ScaleX(int x)
{
_Init();
return MulDiv(x, _dpiX, 96);
}
int ScaleY(int y)
{
_Init();
return MulDiv(y, _dpiY, 96);
}
int UnscaleX(int x)
{
_Init();
return MulDiv(x, 96, _dpiX);
}
int UnscaleY(int y)
{
_Init();
return MulDiv(y, 96, _dpiY);
}
int _ScaledSystemMetricX(int nIndex)
{
_Init();
return MulDiv(GetSystemMetrics(nIndex), 96, _dpiX);
}
int _ScaledSystemMetricY(int nIndex)
{
_Init();
return MulDiv(GetSystemMetrics(nIndex), 96, _dpiY);
}
// Determine the screen dimensions in relative pixels.
int ScaledScreenWidth()
{
return _ScaledSystemMetricX(SM_CXSCREEN);
}
int ScaledScreenHeight()
{
return _ScaledSystemMetricY(SM_CYSCREEN);
}
// Scale rectangle from raw pixels to relative pixels.
void ScaleRect(__inout RECT *pRect)
{
pRect->left = ScaleX(pRect->left);
pRect->right = ScaleX(pRect->right);
pRect->top = ScaleY(pRect->top);
pRect->bottom = ScaleY(pRect->bottom);
}
// Determine if screen resolution meets minimum requirements in relative pixels.
BOOL IsResolutionAtLeast(int cxMin, int cyMin)
{
return (ScaledScreenWidth() >= cxMin) && (ScaledScreenHeight() >= cyMin);
}
// Convert a point size (1/72 of an inch) to raw pixels.
int PointsToPixels(int pt)
{
_Init();
return MulDiv(pt, _dpiY, 72);
}
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