win32-窗体尺寸自适应

// 自动分辨率
// gameWndWidth
// gameWndHeight 需要自行修改游戏本身画面的缩放比（这里是1334.0 / 750.0）
// rate          相对于屏幕尺寸的百分比（0-1.0）
void ProjectConfig::setAutoResolution(float gameWndWidth, float gameWndHeight, float rate)
{
	HWND hWnd = GetDesktopWindow();
	HMONITOR hMonitor = MonitorFromWindow(hWnd, MONITOR_DEFAULTTONEAREST);

	// 获取监视器逻辑宽度与高度
	MONITORINFOEX miex;
	miex.cbSize = sizeof(miex);
	GetMonitorInfo(hMonitor, &miex);
	int cxLogical = (miex.rcMonitor.right - miex.rcMonitor.left);
	int cyLogical = (miex.rcMonitor.bottom - miex.rcMonitor.top);

	// 获取监视器物理宽度与高度
	DEVMODE dm;
	dm.dmSize = sizeof(dm);
	dm.dmDriverExtra = 0;
	EnumDisplaySettings(miex.szDevice, ENUM_CURRENT_SETTINGS, &dm);
	int cxPhysical = dm.dmPelsWidth;
	int cyPhysical = dm.dmPelsHeight;
	// dpi缩放比例
	double dpi_scale = ((double)cxPhysical / (double)cxLogical);

	int cx = GetSystemMetrics(SM_CXSCREEN) * dpi_scale;
	int cy = GetSystemMetrics(SM_CYSCREEN) * dpi_scale;
    // 拿到实际的宽高，并保证 宽> 高
	float width = cx > cy ? cx : cy;
	float height = cx > cy ? cy : cx;
    // 游戏视图的缩放
	float scale = gameWndWidth / gameWndHeight;

	cocos2d::Size size;
    // 计算出自适应后窗口的大小
	size.width = height * rate * scale;
	size.height = height * rate;

	setFrameSize(size);
}