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#include <windows.h>
#include "WindowsSHC.h"
#include <stdlib.h>
#include <stdio.h>
// #define VERBOSE_ON 1
#ifdef VERBOSE_ON
#define DBG_PRINT(args...) fprintf(stderr, args);
#else
#define DBG_PRINT(args...)
#endif
/* GetProcAddress doesn't exist in A/W variants under desktop Windows */
#ifndef UNDER_CE
#define GetProcAddressA GetProcAddress
#endif
typedef HRESULT(WINAPI *GetDpiForMonitorPROCADDR)(HMONITOR, int, UINT*, UINT*);
#ifndef MDT_EFFECTIVE_DPI
#define MDT_EFFECTIVE_DPI 0
#endif
// See also SetProcessDpiAwareness(..) and SetThreadDpiAwarenessContext(..)
#define INIT_CALLED_MASK 1 << 0
#define INIT_HAS_SHC_EXT_MASK 1 << 1
#define HAS_INIT(a) ( 0 != ( INIT_CALLED_MASK & (a) ) )
#define HAS_SHC_EXT(a) ( 0 != ( INIT_HAS_SHC_EXT_MASK & (a) ) )
static int _init = 0; // INIT_ bits, see above
static GetDpiForMonitorPROCADDR _GetDpiForMonitor = NULL;
static int initWindowsSHC() {
if( !HAS_INIT(_init) ) {
_init |= INIT_CALLED_MASK;
HANDLE hShcAPI = LoadLibrary(TEXT("shcore.dll"));
if (hShcAPI) {
_GetDpiForMonitor = (GetDpiForMonitorPROCADDR) GetProcAddressA (hShcAPI, "GetDpiForMonitor");
if(NULL != _GetDpiForMonitor ) {
_init |= INIT_HAS_SHC_EXT_MASK;
}
}
// FreeLibrary (hShcAPI);
DBG_PRINT("DWM - initWindowsSHC: hasSHC %d\n", HAS_SHC_EXT(_init));
}
return _init;
}
BOOL ShcIsExtensionAvailable() {
return HAS_SHC_EXT( initWindowsSHC() ) ? TRUE : FALSE;
}
BOOL ShcGetMonitorPixelScale1(HMONITOR hmon, float *psXY) {
psXY[0] = 0;
psXY[1] = 0;
if( !ShcIsExtensionAvailable() ) {
return FALSE;
}
if( NULL == hmon ) {
return FALSE;
}
UINT dpiX=0, dpiY=0;
if( S_OK != _GetDpiForMonitor(hmon, MDT_EFFECTIVE_DPI, &dpiX, &dpiY) ) {
return FALSE;
}
psXY[0] = (float)(dpiX) / 96.0f;
psXY[1] = (float)(dpiY) / 96.0f;
return TRUE;
}
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