electron/brightray/browser/win/win32_desktop_notifications/common.h

#pragma once
#include <Windows.h>

namespace brightray {

struct NotificationData {
    DesktopNotificationController* controller = nullptr;

    std::wstring caption;
    std::wstring body_text;
    HBITMAP image = NULL;

    NotificationData() = default;

    ~NotificationData() {
        if (image) DeleteObject(image);
    }

    NotificationData(const NotificationData& other) = delete;
    NotificationData& operator=(const NotificationData& other) = delete;
};

template<typename T>
constexpr T ScaleForDpi(T value, unsigned dpi, unsigned source_dpi = 96) {
    return value * dpi / source_dpi;
}

struct ScreenMetrics {
    UINT dpi_x, dpi_y;

    ScreenMetrics() {
        typedef HRESULT WINAPI GetDpiForMonitor_t(HMONITOR, int, UINT*, UINT*);

        auto GetDpiForMonitor = reinterpret_cast<GetDpiForMonitor_t*>(
            GetProcAddress(GetModuleHandle(TEXT("shcore")),
                           "GetDpiForMonitor"));

        if (GetDpiForMonitor) {
            auto monitor = MonitorFromPoint({}, MONITOR_DEFAULTTOPRIMARY);
            if (GetDpiForMonitor(monitor, 0, &dpi_x, &dpi_y) == S_OK)
                return;
        }

        HDC hdc = GetDC(NULL);
        dpi_x = GetDeviceCaps(hdc, LOGPIXELSX);
        dpi_y = GetDeviceCaps(hdc, LOGPIXELSY);
        ReleaseDC(NULL, hdc);
    }

    template<class T> T X(T value) const { return ScaleForDpi(value, dpi_x); }
    template<class T> T Y(T value) const { return ScaleForDpi(value, dpi_y); }
};

}   // namespace brightray