WIN32: Add experimental SDL2 support.

Based on changes by aquadran.

backends/platform/sdl/sdl-window.cpp

@@ -28,6 +28,8 @@
 
 #include "icons/scummvm.xpm"
 
+#include <SDL_syswm.h>
+
 SdlWindow::SdlWindow()
 #if SDL_VERSION_ATLEAST(2, 0, 0)
 	: _window(nullptr), _inputGrabState(false), _windowCaption("ScummVM"), _windowIcon(nullptr)
@@ -171,6 +173,15 @@ void SdlWindow::iconifyWindow() {
 #endif
 }
 
+bool SdlWindow::getSDLWMInformation(SDL_SysWMinfo *info) const {
+	SDL_VERSION(&info->version);
+#if SDL_VERSION_ATLEAST(2, 0, 0)
+	return SDL_GetWindowWMInfo(_window, info);
+#else
+	return SDL_GetWMInfo(info);
+#endif
+}
+
 #if SDL_VERSION_ATLEAST(2, 0, 0)
 SDL_Surface *copySDLSurface(SDL_Surface *src) {
 	const bool locked = SDL_MUSTLOCK(src) == SDL_TRUE;

backends/platform/sdl/sdl-window.h

@@ -27,6 +27,8 @@
 
 #include "common/str.h"
 
+struct SDL_SysWMinfo;
+
 class SdlWindow {
 public:
 	SdlWindow();
@@ -65,6 +67,14 @@ public:
 	 */
 	void iconifyWindow();
 
+	/**
+	 * Query platform specific SDL window manager information.
+	 *
+	 * Since this is an SDL internal structure clients are responsible
+	 * for accessing it in a version safe manner.
+	 */
+	bool getSDLWMInformation(SDL_SysWMinfo *info) const;
+
 #if SDL_VERSION_ATLEAST(2, 0, 0)
 public:
 	/**

backends/platform/sdl/win32/win32-main.cpp

@@ -40,7 +40,9 @@
 #include "base/main.h"
 
 int __stdcall WinMain(HINSTANCE /*hInst*/, HINSTANCE /*hPrevInst*/,  LPSTR /*lpCmdLine*/, int /*iShowCmd*/) {
+#if !SDL_VERSION_ATLEAST(2, 0, 0)
 	SDL_SetModuleHandle(GetModuleHandle(NULL));
+#endif
 	return main(__argc, __argv);
 }
 

backends/platform/sdl/win32/win32-window.cpp

@@ -37,11 +37,14 @@ void SdlWindow_Win32::setupIcon() {
 	HMODULE handle = GetModuleHandle(NULL);
 	HICON   ico    = LoadIcon(handle, MAKEINTRESOURCE(1001 /* IDI_ICON */));
 	if (ico) {
-		SDL_SysWMinfo  wminfo;
+		SDL_SysWMinfo wminfo;
-		SDL_VERSION(&wminfo.version);
+		if (getSDLWMInformation(&wminfo)) {
-		if (SDL_GetWMInfo(&wminfo)) {
 			// Replace the handle to the icon associated with the window class by our custom icon
+#if SDL_VERSION_ATLEAST(2, 0, 0)
+			SetClassLongPtr(wminfo.info.win.window, GCLP_HICON, (ULONG_PTR)ico);
+#else
 			SetClassLongPtr(wminfo.window, GCLP_HICON, (ULONG_PTR)ico);
+#endif
 
 			// Since there wasn't any default icon, we can't use the return value from SetClassLong
 			// to check for errors (it would be 0 in both cases: error or no previous value for the

backends/platform/sdl/win32/win32.cpp

@@ -54,7 +54,7 @@ void OSystem_Win32::init() {
 
 #if defined(USE_TASKBAR)
 	// Initialize taskbar manager
-	_taskbarManager = new Win32TaskbarManager();
+	_taskbarManager = new Win32TaskbarManager(_window);
 #endif
 
 	// Invoke parent implementation of this method

backends/taskbar/win32/win32-taskbar.cpp

@@ -62,7 +62,7 @@
 // System.Title property key, values taken from http://msdn.microsoft.com/en-us/library/bb787584.aspx
 const PROPERTYKEY PKEY_Title = { /* fmtid = */ { 0xF29F85E0, 0x4FF9, 0x1068, { 0xAB, 0x91, 0x08, 0x00, 0x2B, 0x27, 0xB3, 0xD9 } }, /* propID = */ 2 };
 
-Win32TaskbarManager::Win32TaskbarManager() : _taskbar(NULL), _count(0), _icon(NULL) {
+Win32TaskbarManager::Win32TaskbarManager(SdlWindow *window) : _window(window), _taskbar(NULL), _count(0), _icon(NULL) {
 	// Do nothing if not running on Windows 7 or later
 	if (!isWin7OrLater())
 		return;
@@ -408,12 +408,15 @@ LPWSTR Win32TaskbarManager::ansiToUnicode(const char *s) {
 
 HWND Win32TaskbarManager::getHwnd() {
 	SDL_SysWMinfo wmi;
-	SDL_VERSION(&wmi.version);
+	if (_window->getSDLWMInformation(&wmi)) {
-
+#if SDL_VERSION_ATLEAST(2, 0, 0)
-	if(!SDL_GetWMInfo(&wmi))
+		return wmi.info.win.window;
+#else
+		return wmi.window;
+#endif
+	} else {
 		return NULL;
-
+	}
-	return wmi.window;
 }
 
 #endif

backends/taskbar/win32/win32-taskbar.h

@@ -25,6 +25,8 @@
 
 #if defined(WIN32) && defined(USE_TASKBAR)
 
+#include "backends/platform/sdl/sdl-window.h"
+
 #include "common/str.h"
 #include "common/taskbar.h"
 
@@ -32,7 +34,7 @@ struct ITaskbarList3;
 
 class Win32TaskbarManager : public Common::TaskbarManager {
 public:
-	Win32TaskbarManager();
+	Win32TaskbarManager(SdlWindow *window);
 	virtual ~Win32TaskbarManager();
 
 	virtual void setOverlayIcon(const Common::String &name, const Common::String &description);
@@ -44,6 +46,8 @@ public:
 	virtual void clearError();
 
 private:
+	SdlWindow *_window;
+
 	ITaskbarList3 *_taskbar;
 
 	// Count handling