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