Dip 缩放比例

àì夳堔傛蜴生んèń 2021-12-22 10:27 271阅读 0赞

double DipToZoom(_In_ int dip)
    {
    	double dRet = 1.0;
    
    	switch (dip)
    	{
    	case 96:
    		dRet = 1.00;
    		break;
    	case 120:
    		dRet = 1.25;
    		break;
    	case 144:
    		dRet = 1.50;
    		break;
    	case 192:
    		dRet = 2.0;
    		break;
    	default:
    		dRet = 1.00;
    	}
    
    	return dRet;
    }
    
    VOID GetProcessZoom(_Out_ double& xZoom, _Out_ double& yZoom)
    {
    	HDC desktopDc = ::GetDC(NULL);
    
    	xZoom = yZoom = 1.00;
    
    	do 
    	{
    		if (NULL == desktopDc) break;
    
    		xZoom = DipToZoom(::GetDeviceCaps(desktopDc, LOGPIXELSX));
    		yZoom = DipToZoom(::GetDeviceCaps(desktopDc, LOGPIXELSY));
    
    		::ReleaseDC(NULL, desktopDc);
    
    	} while (0);
    }
    
    
    #pragma once
    
    #ifndef __SHCORE_H__
    #define __SHCORE_H__
    
    #include <wtypes.h>
    
    #define SHCORE_NAME_A					"Shcore.dll"
    #define SHCORE_NAME_W					L"Shcore.dll"
    
    #define SetProcessDpiAwareness_NAME_A	"SetProcessDpiAwareness"
    #define GetProcessDpiAwareness_NAME_A	"GetProcessDpiAwareness"
    
    typedef enum {
    	PROCESS_DPI_UNAWARE				= 0,
    	PROCESS_SYSTEM_DPI_AWARE		= 1,
    	PROCESS_PER_MONITOR_DPI_AWARE	= 2,
    }E_PROCESS_DPI_AWARENESS;
    
    typedef
    HRESULT 
    (WINAPI* SetProcessDpiAwareness_T)(
    	_In_ E_PROCESS_DPI_AWARENESS value);
    
    typedef
    HRESULT
    (WINAPI* GetProcessDpiAwareness_T)(
    _In_opt_ HANDLE hprocess,
    _Out_ E_PROCESS_DPI_AWARENESS *value);
    
    class Shcore
    {
    public:
    	static HMODULE GetModuleHandle();
    
    	static SetProcessDpiAwareness_T SetProcessDpiAwareness();
    
    	static GetProcessDpiAwareness_T GetProcessDpiAwareness();
    };
    
    #endif
    
    
    #include "Shcore.h"
    
    HMODULE Shcore::GetModuleHandle()
    {
    	static HMODULE s_hShcore = NULL;
    
    	if (NULL == s_hShcore)
    	{
    		s_hShcore = ::GetModuleHandleW(SHCORE_NAME_W);
    	}
    
    	return s_hShcore;
    }
    
    SetProcessDpiAwareness_T Shcore::SetProcessDpiAwareness()
    {
    	return (SetProcessDpiAwareness_T)::GetProcAddress(GetModuleHandle(), SetProcessDpiAwareness_NAME_A);
    }
    
    GetProcessDpiAwareness_T Shcore::GetProcessDpiAwareness()
    {
    	return (GetProcessDpiAwareness_T)::GetProcAddress(GetModuleHandle(), GetProcessDpiAwareness_NAME_A);
    }
    
    HRESULT SetCurProDipAwareness(_In_ E_PROCESS_DPI_AWARENESS value)
    {
    	HRESULT hr = S_OK;
    
    	static SetProcessDpiAwareness_T s_SetProcessDpiAwareness = NULL;
    
    	if (NULL == s_SetProcessDpiAwareness)
    	{
    		s_SetProcessDpiAwareness = Shcore::SetProcessDpiAwareness();
    	}
    
    	if (NULL != s_SetProcessDpiAwareness)
    	{
    		hr = s_SetProcessDpiAwareness(value);
    	}
    
    	return hr;
    }
    
    HRESULT GetCurProDpiAwareness(_Out_ E_PROCESS_DPI_AWARENESS& value)
    {
    	HRESULT hr = S_OK;
    
    	static GetProcessDpiAwareness_T s_GetProcessDpiAwareness = NULL;
    
    	if (NULL == s_GetProcessDpiAwareness)
    	{
    		s_GetProcessDpiAwareness = Shcore::GetProcessDpiAwareness();
    	}
    
    	if (NULL != s_GetProcessDpiAwareness)
    	{
    		hr = s_GetProcessDpiAwareness(::GetCurrentProcess(),&value);
    	}
    
    	return hr;
    }