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backends/platform/sdl/macosx/macosx-window.mm

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+// Disable symbol overrides so that we can use system headers.
+#define FORBIDDEN_SYMBOL_ALLOW_ALL
+
+#include "backends/platform/sdl/macosx/macosx-window.h"
+#include "backends/platform/sdl/macosx/macosx-compat.h"
+#include <AppKit/NSWindow.h>
+
+float SdlWindow_MacOSX::getDpiScalingFactor() const {
+#if !SDL_VERSION_ATLEAST(3, 0, 0) && SDL_VERSION_ATLEAST(2, 0, 0) && MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7
+	SDL_SysWMinfo wmInfo;
+	if (getSDLWMInformation(&wmInfo)) {
+		NSWindow *nswindow = wmInfo.info.cocoa.window;
+		if ([nswindow respondsToSelector:@selector(backingScaleFactor)]) {
+			debug(4, "Reported DPI ratio: %g", [nswindow backingScaleFactor]);
+			return [nswindow backingScaleFactor];
+		}
+	}
+#endif
+
+	return SdlWindow::getDpiScalingFactor();
+}