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DpiUtil.cpp
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100 lines (93 loc) · 3.06 KB
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// Copyright (C) Microsoft Corporation. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "stdafx.h"
#include "CheckFailure.h"
#include "DpiUtil.h"
void DpiUtil::SetProcessDpiAwarenessContext(DPI_AWARENESS_CONTEXT dpiAwarenessContext)
{
// Call the latest DPI awareness function possible
static auto SetProcessDpiAwarenessContextFunc = []() {
return reinterpret_cast<decltype(&::SetProcessDpiAwarenessContext)>(
::GetProcAddress(GetUser32Module(), "SetProcessDpiAwarenessContext"));
}();
if (SetProcessDpiAwarenessContextFunc)
{
// Windows 10 1703+: SetProcessDpiAwarenessContext
SetProcessDpiAwarenessContextFunc(dpiAwarenessContext);
}
else
{
static auto SetProcessDpiAwarenessFunc = []() {
return reinterpret_cast<decltype(&::SetProcessDpiAwareness)>(
::GetProcAddress(GetShcoreModule(), "SetProcessDpiAwareness"));
}();
if (SetProcessDpiAwarenessFunc)
{
// Windows 8.1+: SetProcessDpiAwareness
SetProcessDpiAwarenessFunc(
ProcessDpiAwarenessFromDpiAwarenessContext(dpiAwarenessContext));
}
else if (dpiAwarenessContext != DPI_AWARENESS_CONTEXT_UNAWARE)
{
// Windows 7+: SetProcessDPIAware
::SetProcessDPIAware();
}
}
}
int DpiUtil::GetDpiForWindow(HWND window)
{
static auto GetDpiForMonitorFunc = []() {
return reinterpret_cast<decltype(&::GetDpiForMonitor)>(
::GetProcAddress(GetShcoreModule(), "GetDpiForMonitor"));
}();
if (GetDpiForMonitorFunc)
{
UINT dpi_x, dpi_y;
HMONITOR monitor = ::MonitorFromWindow(window, MONITOR_DEFAULTTONEAREST);
CHECK_FAILURE(GetDpiForMonitorFunc(monitor, MDT_EFFECTIVE_DPI, &dpi_x, &dpi_y));
return dpi_x;
}
else
{
return GetDeviceCaps(GetDC(nullptr), LOGPIXELSX);
}
}
HMODULE DpiUtil::GetUser32Module()
{
static HMODULE user32Module = nullptr;
if (user32Module == nullptr)
{
user32Module = LoadLibraryA("User32.dll");
}
return user32Module;
}
HMODULE DpiUtil::GetShcoreModule()
{
static HMODULE shcoreModule = nullptr;
if (shcoreModule == nullptr)
{
shcoreModule = LoadLibraryA("Shcore.dll");
}
return shcoreModule;
}
PROCESS_DPI_AWARENESS DpiUtil::ProcessDpiAwarenessFromDpiAwarenessContext(
DPI_AWARENESS_CONTEXT dpiAwarenessContext)
{
if (dpiAwarenessContext == DPI_AWARENESS_CONTEXT_UNAWARE ||
dpiAwarenessContext == DPI_AWARENESS_CONTEXT_UNAWARE_GDISCALED)
{
return PROCESS_DPI_UNAWARE;
}
if (dpiAwarenessContext == DPI_AWARENESS_CONTEXT_SYSTEM_AWARE)
{
return PROCESS_SYSTEM_DPI_AWARE;
}
if (dpiAwarenessContext == DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE ||
dpiAwarenessContext == DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2)
{
return PROCESS_PER_MONITOR_DPI_AWARE;
}
// All DPI awarenes contexts should be covered above.
FAIL_FAST();
}