/*

SDL - Simple DirectMedia Layer

Copyright (C) 1997-2006 Sam Lantinga

This library is free software; you can redistribute it and/or

modify it under the terms of the GNU Lesser General Public

License as published by the Free Software Foundation; either

version 2.1 of the License, or (at your option) any later version.

This library 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

Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public

License along with this library; if not, write to the Free Software

Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

Sam Lantinga

slouken@libsdl.org

*/

#include "SDL_config.h"

#define WIN32_LEAN_AND_MEAN

#include <windows.h>

#include "SDL_events.h"

#include "SDL_video.h"

#include "SDL_syswm.h"

#include "../SDL_sysvideo.h"

#include "../../events/SDL_sysevents.h"

#include "../../events/SDL_events_c.h"

#include "SDL_lowvideo.h"

#include "SDL_syswm_c.h"

#include "SDL_main.h"

#include "SDL_loadso.h"

#ifdef WMMSG_DEBUG

#include "wmmsg.h"

#endif

#ifdef _WIN32_WCE

#include "../gapi/SDL_gapivideo.h"

#define IsZoomed(HWND) 1

#define NO_GETKEYBOARDSTATE

#if _WIN32_WCE < 420

#define NO_CHANGEDISPLAYSETTINGS

#endif

#endif

/* The window we use for everything... */

#ifdef _WIN32_WCE

LPWSTR SDL_Appname = NULL;

#else

LPSTR SDL_Appname = NULL;

#endif

Uint32 SDL_Appstyle = 0;

HINSTANCE SDL_Instance = NULL;

HWND SDL_Window = NULL;

RECT SDL_bounds = {0, 0, 0, 0};

int SDL_windowX = 0;

int SDL_windowY = 0;

int SDL_resizing = 0;

int mouse_relative = 0;

int posted = 0;

#ifndef NO_CHANGEDISPLAYSETTINGS

DEVMODE SDL_desktop_mode;

DEVMODE SDL_fullscreen_mode;

#endif

WORD *gamma_saved = NULL;

/* Functions called by the message processing function */

LONG (*HandleMessage)(_THIS, HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)=NULL;

void (*WIN_RealizePalette)(_THIS);

void (*WIN_PaletteChanged)(_THIS, HWND window);

void (*WIN_WinPAINT)(_THIS, HDC hdc);

extern void DIB_SwapGamma(_THIS);

#ifndef NO_GETKEYBOARDSTATE

/* Variables and support functions for SDL_ToUnicode() */

static int codepage;

static int Is9xME();

static int GetCodePage();

static int WINAPI ToUnicode9xME(UINT vkey, UINT scancode, BYTE *keystate, LPWSTR wchars, int wsize, UINT flags);

ToUnicodeFN SDL_ToUnicode = ToUnicode9xME;

#endif /* !NO_GETKEYBOARDSTATE */

#if defined(_WIN32_WCE)

// dynamically load aygshell dll because we want SDL to work on HPC and be300

HINSTANCE aygshell = NULL;

BOOL (WINAPI *SHFullScreen)(HWND hwndRequester, DWORD dwState) = 0;

#define SHFS_SHOWTASKBAR 0x0001

#define SHFS_HIDETASKBAR 0x0002

#define SHFS_SHOWSIPBUTTON 0x0004

#define SHFS_HIDESIPBUTTON 0x0008

#define SHFS_SHOWSTARTICON 0x0010

#define SHFS_HIDESTARTICON 0x0020

static void LoadAygshell(void)

{

if( !aygshell )

aygshell = SDL_LoadObject("aygshell.dll");

if( (aygshell != 0) && (SHFullScreen == 0) )

{

SHFullScreen = (int (WINAPI *)(struct HWND__ *,unsigned long)) SDL_LoadFunction(aygshell, "SHFullScreen");

}

}

/* for gapi landscape mode */

static void GapiTransform(SDL_ScreenOrientation rotate, char hires, Sint16 *x, Sint16 *y) {

Sint16 rotatedX;

Sint16 rotatedY;

if (hires) {

*x = *x * 2;

*y = *y * 2;

}

switch(rotate) {

case SDL_ORIENTATION_UP:

{

/* this code needs testing on a real device!

So it will be enabled later */

/*

#ifdef _WIN32_WCE

#if _WIN32_WCE >= 420

// test device orientation

// FIXME: do not check every mouse message

DEVMODE settings;

SDL_memset(&settings, 0, sizeof(DEVMODE));

settings.dmSize = sizeof(DEVMODE);

settings.dmFields = DM_DISPLAYORIENTATION;

ChangeDisplaySettingsEx(NULL, &settings, NULL, CDS_TEST, NULL);

if( settings.dmOrientation == DMDO_90 )

{

rotatedX = SDL_VideoSurface->h - *x;

rotatedY = *y;

*x = rotatedX;

*y = rotatedY;

}

#endif

#endif */

}

break;

case SDL_ORIENTATION_RIGHT:

if (!SDL_VideoSurface)

break;

rotatedX = SDL_VideoSurface->w - *y;

rotatedY = *x;

*x = rotatedX;

*y = rotatedY;

break;

case SDL_ORIENTATION_LEFT:

if (!SDL_VideoSurface)

break;

rotatedX = *y;

rotatedY = SDL_VideoSurface->h - *x;

*x = rotatedX;

*y = rotatedY;

break;

}

}

#endif

static void SDL_RestoreGameMode(void)

{

#ifdef _WIN32_WCE

SDL_VideoDevice *this = current_video;

if(SDL_strcmp(this->name, "gapi") == 0)

{

if( this->hidden->suspended )

{

this->hidden->suspended = 0;

}

}

#else

ShowWindow(SDL_Window, SW_RESTORE);

#endif

#ifndef NO_CHANGEDISPLAYSETTINGS

#ifndef _WIN32_WCE

ChangeDisplaySettings(&SDL_fullscreen_mode, CDS_FULLSCREEN);

#endif

#endif /* NO_CHANGEDISPLAYSETTINGS */

}

static void SDL_RestoreDesktopMode(void)

{

#ifdef _WIN32_WCE

SDL_VideoDevice *this = current_video;

if(SDL_strcmp(this->name, "gapi") == 0)

{

if( !this->hidden->suspended )

{

this->hidden->suspended = 1;

}

}

#else

/* WinCE does not have a taskbar, so minimizing is not convenient */

ShowWindow(SDL_Window, SW_MINIMIZE);

#endif

#ifndef NO_CHANGEDISPLAYSETTINGS

#ifndef _WIN32_WCE

ChangeDisplaySettings(NULL, 0);

#endif

#endif /* NO_CHANGEDISPLAYSETTINGS */

}

#ifdef WM_MOUSELEAVE

/*

Special code to handle mouse leave events - this sucks...

http://support.microsoft.com/support/kb/articles/q183/1/07.asp

TrackMouseEvent() is only available on Win98 and WinNT.

_TrackMouseEvent() is available on Win95, but isn't yet in the mingw32

development environment, and only works on systems that have had IE 3.0

or newer installed on them (which is not the case with the base Win95).

Therefore, we implement our own version of _TrackMouseEvent() which

uses our own implementation if TrackMouseEvent() is not available.

*/

static BOOL (WINAPI *_TrackMouseEvent)(TRACKMOUSEEVENT *ptme) = NULL;

static VOID CALLBACK

TrackMouseTimerProc(HWND hWnd, UINT uMsg, UINT idEvent, DWORD dwTime)

{

RECT rect;

POINT pt;

GetClientRect(hWnd, &rect);

MapWindowPoints(hWnd, NULL, (LPPOINT)&rect, 2);

GetCursorPos(&pt);

if ( !PtInRect(&rect, pt) || (WindowFromPoint(pt) != hWnd) ) {

if ( !KillTimer(hWnd, idEvent) ) {

/* Error killing the timer! */

}

PostMessage(hWnd, WM_MOUSELEAVE, 0, 0);

}

}

static BOOL WINAPI WIN_TrackMouseEvent(TRACKMOUSEEVENT *ptme)

{

if ( ptme->dwFlags == TME_LEAVE ) {

return SetTimer(ptme->hwndTrack, ptme->dwFlags, 100,

(TIMERPROC)TrackMouseTimerProc) != 0;

}

return FALSE;

}

#endif /* WM_MOUSELEAVE */

/* Function to retrieve the current keyboard modifiers */

static void WIN_GetKeyboardState(void)

{

#ifndef NO_GETKEYBOARDSTATE

SDLMod state;

BYTE keyboard[256];

Uint8 *kstate = SDL_GetKeyState(NULL);

state = KMOD_NONE;

if ( GetKeyboardState(keyboard) ) {

if ( keyboard[VK_LSHIFT] & 0x80) {

state |= KMOD_LSHIFT;

kstate[SDLK_LSHIFT] = SDL_PRESSED;

}

if ( keyboard[VK_RSHIFT] & 0x80) {

state |= KMOD_RSHIFT;

kstate[SDLK_RSHIFT] = SDL_PRESSED;

}

if ( keyboard[VK_LCONTROL] & 0x80) {

state |= KMOD_LCTRL;

kstate[SDLK_LCTRL] = SDL_PRESSED;

}

if ( keyboard[VK_RCONTROL] & 0x80) {

state |= KMOD_RCTRL;

kstate[SDLK_RCTRL] = SDL_PRESSED;

}

if ( keyboard[VK_LMENU] & 0x80) {

state |= KMOD_LALT;

kstate[SDLK_LALT] = SDL_PRESSED;

}

if ( keyboard[VK_RMENU] & 0x80) {

state |= KMOD_RALT;

kstate[SDLK_RALT] = SDL_PRESSED;

}

if ( keyboard[VK_NUMLOCK] & 0x01) {

state |= KMOD_NUM;

kstate[SDLK_NUMLOCK] = SDL_PRESSED;

}

if ( keyboard[VK_CAPITAL] & 0x01) {

state |= KMOD_CAPS;

kstate[SDLK_CAPSLOCK] = SDL_PRESSED;

}

}

SDL_SetModState(state);

#endif /* !NO_GETKEYBOARDSTATE */

}

/* The main Win32 event handler

DJM: This is no longer static as (DX5/DIB)_CreateWindow needs it

*/

LRESULT CALLBACK WinMessage(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)

{

SDL_VideoDevice *this = current_video;

static int mouse_pressed = 0;

static int in_window = 0;

#ifdef WMMSG_DEBUG

fprintf(stderr, "Received windows message: ");

if ( msg > MAX_WMMSG ) {

fprintf(stderr, "%d", msg);

} else {

fprintf(stderr, "%s", wmtab[msg]);

}

fprintf(stderr, " -- 0x%X, 0x%X\n", wParam, lParam);

#endif

switch (msg) {

case WM_ACTIVATE: {

SDL_VideoDevice *this = current_video;

BOOL minimized;

Uint8 appstate;

minimized = HIWORD(wParam);

if ( !minimized && (LOWORD(wParam) != WA_INACTIVE) ) {

/* Gain the following states */

appstate = SDL_APPACTIVE|SDL_APPINPUTFOCUS;

if ( this->input_grab != SDL_GRAB_OFF ) {

WIN_GrabInput(this, SDL_GRAB_ON);

}

if ( !(SDL_GetAppState()&SDL_APPINPUTFOCUS) ) {

if ( ! DDRAW_FULLSCREEN() ) {

DIB_SwapGamma(this);

}

if ( WINDIB_FULLSCREEN() ) {

SDL_RestoreGameMode();

}

}

#if defined(_WIN32_WCE)

if ( WINDIB_FULLSCREEN() )

{

LoadAygshell();

if( SHFullScreen )

SHFullScreen(SDL_Window, SHFS_HIDESTARTICON|SHFS_HIDETASKBAR|SHFS_HIDESIPBUTTON);

else

ShowWindow(FindWindow(TEXT("HHTaskBar"),NULL),SW_HIDE);

}

#endif

posted = SDL_PrivateAppActive(1, appstate);

WIN_GetKeyboardState();

} else {

/* Lose the following states */

appstate = SDL_APPINPUTFOCUS;

if ( minimized ) {

appstate |= SDL_APPACTIVE;

}

if ( this->input_grab != SDL_GRAB_OFF ) {

WIN_GrabInput(this, SDL_GRAB_OFF);

}

if ( SDL_GetAppState() & SDL_APPINPUTFOCUS ) {

if ( ! DDRAW_FULLSCREEN() ) {

DIB_SwapGamma(this);

}

if ( WINDIB_FULLSCREEN() ) {

SDL_RestoreDesktopMode();

#if defined(_WIN32_WCE)

LoadAygshell();

if( SHFullScreen )

SHFullScreen(SDL_Window, SHFS_SHOWSTARTICON|SHFS_SHOWTASKBAR|SHFS_SHOWSIPBUTTON);

else

ShowWindow(FindWindow(TEXT("HHTaskBar"),NULL),SW_SHOW);

#endif

}

}

posted = SDL_PrivateAppActive(0, appstate);

}

return(0);

}

break;

case WM_MOUSEMOVE: {

/* Mouse is handled by DirectInput when fullscreen */

if ( SDL_VideoSurface && ! DINPUT_FULLSCREEN() ) {

Sint16 x, y;

/* mouse has entered the window */

if ( ! in_window ) {

#ifdef WM_MOUSELEAVE

TRACKMOUSEEVENT tme;

tme.cbSize = sizeof(tme);

tme.dwFlags = TME_LEAVE;

tme.hwndTrack = SDL_Window;

_TrackMouseEvent(&tme);

#endif /* WM_MOUSELEAVE */

in_window = TRUE;

posted = SDL_PrivateAppActive(1, SDL_APPMOUSEFOCUS);

}

/* mouse has moved within the window */

x = LOWORD(lParam);

y = HIWORD(lParam);

if ( mouse_relative ) {

POINT center;

center.x = (SDL_VideoSurface->w/2);

center.y = (SDL_VideoSurface->h/2);

x -= (Sint16)center.x;

y -= (Sint16)center.y;

if ( x || y ) {

ClientToScreen(SDL_Window, &center);

SetCursorPos(center.x, center.y);

posted = SDL_PrivateMouseMotion(0, 1, x, y);

}

} else {

#ifdef _WIN32_WCE

if (SDL_VideoSurface)

GapiTransform(this->hidden->userOrientation, this->hidden->hiresFix, &x, &y);

#endif

posted = SDL_PrivateMouseMotion(0, 0, x, y);

}

}

}

return(0);

#ifdef WM_MOUSELEAVE

case WM_MOUSELEAVE: {

/* Mouse is handled by DirectInput when fullscreen */

if ( SDL_VideoSurface && ! DINPUT_FULLSCREEN() ) {

/* mouse has left the window */

/* or */

/* Elvis has left the building! */

posted = SDL_PrivateAppActive(0, SDL_APPMOUSEFOCUS);

}

in_window = FALSE;

}

return(0);

#endif /* WM_MOUSELEAVE */

case WM_LBUTTONDOWN:

case WM_LBUTTONUP:

case WM_MBUTTONDOWN:

case WM_MBUTTONUP:

case WM_RBUTTONDOWN:

case WM_RBUTTONUP: {

/* Mouse is handled by DirectInput when fullscreen */

if ( SDL_VideoSurface && ! DINPUT_FULLSCREEN() ) {

Sint16 x, y;

Uint8 button, state;

/* DJM:

We want the SDL window to take focus so that

it acts like a normal windows "component"

(e.g. gains keyboard focus on a mouse click).

*/

SetFocus(SDL_Window);

/* Figure out which button to use */

switch (msg) {

case WM_LBUTTONDOWN:

button = SDL_BUTTON_LEFT;

state = SDL_PRESSED;

break;

case WM_LBUTTONUP:

button = SDL_BUTTON_LEFT;

state = SDL_RELEASED;

break;

case WM_MBUTTONDOWN:

button = SDL_BUTTON_MIDDLE;

state = SDL_PRESSED;

break;

case WM_MBUTTONUP:

button = SDL_BUTTON_MIDDLE;

state = SDL_RELEASED;

break;

case WM_RBUTTONDOWN:

button = SDL_BUTTON_RIGHT;

state = SDL_PRESSED;

break;

case WM_RBUTTONUP:

button = SDL_BUTTON_RIGHT;

state = SDL_RELEASED;

break;

default:

/* Eh? Unknown button? */

return(0);

}

if ( state == SDL_PRESSED ) {

/* Grab mouse so we get up events */

if ( ++mouse_pressed > 0 ) {

SetCapture(hwnd);

}

} else {

/* Release mouse after all up events */

if ( --mouse_pressed <= 0 ) {

ReleaseCapture();

mouse_pressed = 0;

}

}

if ( mouse_relative ) {

/* RJR: March 28, 2000

report internal mouse position if in relative mode */

x = 0; y = 0;

} else {

x = (Sint16)LOWORD(lParam);

y = (Sint16)HIWORD(lParam);

#ifdef _WIN32_WCE

if (SDL_VideoSurface)

GapiTransform(this->hidden->userOrientation, this->hidden->hiresFix, &x, &y);

#endif

}

posted = SDL_PrivateMouseButton(

state, button, x, y);

}

}

return(0);

#if (_WIN32_WINNT >= 0x0400) || (_WIN32_WINDOWS > 0x0400)

case WM_MOUSEWHEEL:

if ( SDL_VideoSurface && ! DINPUT_FULLSCREEN() ) {

int move = (short)HIWORD(wParam);

if ( move ) {

Uint8 button;

if ( move > 0 )

button = SDL_BUTTON_WHEELUP;

else

button = SDL_BUTTON_WHEELDOWN;

posted = SDL_PrivateMouseButton(

SDL_PRESSED, button, 0, 0);

posted |= SDL_PrivateMouseButton(

SDL_RELEASED, button, 0, 0);

}

}

return(0);

#endif

#ifdef WM_GETMINMAXINFO

/* This message is sent as a way for us to "check" the values

* of a position change. If we don't like it, we can adjust

* the values before they are changed.

*/

case WM_GETMINMAXINFO: {

MINMAXINFO *info;

RECT size;

int x, y;

int style;

int width;

int height;

/* We don't want to clobber an internal resize */

if ( SDL_resizing )

return(0);

/* We allow resizing with the SDL_RESIZABLE flag */

if ( SDL_PublicSurface &&

(SDL_PublicSurface->flags & SDL_RESIZABLE) ) {

return(0);

}

/* Get the current position of our window */

GetWindowRect(SDL_Window, &size);

x = size.left;

y = size.top;

/* Calculate current width and height of our window */

size.top = 0;

size.left = 0;

if ( SDL_PublicSurface != NULL ) {

size.bottom = SDL_PublicSurface->h;

size.right = SDL_PublicSurface->w;

} else {

size.bottom = 0;

size.right = 0;

}

/* DJM - according to the docs for GetMenu(), the

return value is undefined if hwnd is a child window.

Aparently it's too difficult for MS to check

inside their function, so I have to do it here.

*/

style = GetWindowLong(hwnd, GWL_STYLE);

AdjustWindowRect(

&size,

style,

style & WS_CHILDWINDOW ? FALSE

: GetMenu(hwnd) != NULL);

width = size.right - size.left;

height = size.bottom - size.top;

/* Fix our size to the current size */

info = (MINMAXINFO *)lParam;

info->ptMaxSize.x = width;

info->ptMaxSize.y = height;

info->ptMaxPosition.x = x;

info->ptMaxPosition.y = y;

info->ptMinTrackSize.x = width;

info->ptMinTrackSize.y = height;

info->ptMaxTrackSize.x = width;

info->ptMaxTrackSize.y = height;

}

return(0);

#endif /* WM_GETMINMAXINFO */

case WM_WINDOWPOSCHANGED: {

SDL_VideoDevice *this = current_video;

int w, h;

GetClientRect(SDL_Window, &SDL_bounds);

ClientToScreen(SDL_Window, (LPPOINT)&SDL_bounds);

ClientToScreen(SDL_Window, (LPPOINT)&SDL_bounds+1);

if ( !SDL_resizing && !IsZoomed(SDL_Window) &&

SDL_PublicSurface &&

!(SDL_PublicSurface->flags & SDL_FULLSCREEN) ) {

SDL_windowX = SDL_bounds.left;

SDL_windowY = SDL_bounds.top;

}

w = SDL_bounds.right-SDL_bounds.left;

h = SDL_bounds.bottom-SDL_bounds.top;

if ( this->input_grab != SDL_GRAB_OFF ) {

ClipCursor(&SDL_bounds);

}

if ( SDL_PublicSurface &&

(SDL_PublicSurface->flags & SDL_RESIZABLE) ) {

SDL_PrivateResize(w, h);

}

}

break;

/* We need to set the cursor */

case WM_SETCURSOR: {

Uint16 hittest;

hittest = LOWORD(lParam);

if ( hittest == HTCLIENT ) {

SetCursor(SDL_hcursor);

return(TRUE);

}

}

break;

/* We are about to get palette focus! */

case WM_QUERYNEWPALETTE: {

WIN_RealizePalette(current_video);

return(TRUE);

}

break;

/* Another application changed the palette */

case WM_PALETTECHANGED: {

WIN_PaletteChanged(current_video, (HWND)wParam);

}

break;

/* We were occluded, refresh our display */

case WM_PAINT: {

HDC hdc;

PAINTSTRUCT ps;

hdc = BeginPaint(SDL_Window, &ps);

if ( current_video->screen &&

!(current_video->screen->flags & SDL_OPENGL) ) {

WIN_WinPAINT(current_video, hdc);

}

EndPaint(SDL_Window, &ps);

}

return(0);

/* DJM: Send an expose event in this case */

case WM_ERASEBKGND: {

posted = SDL_PrivateExpose();

}

return(0);

case WM_CLOSE: {

if ( (posted = SDL_PrivateQuit()) )

PostQuitMessage(0);

}

return(0);

case WM_DESTROY: {

PostQuitMessage(0);

}

return(0);

#ifndef NO_GETKEYBOARDSTATE

case WM_INPUTLANGCHANGE: {

codepage = GetCodePage();

}

return(TRUE);

#endif

default: {

/* Special handling by the video driver */

if (HandleMessage) {

return(HandleMessage(current_video,

hwnd, msg, wParam, lParam));

}

}

break;

}

return(DefWindowProc(hwnd, msg, wParam, lParam));

}

/* Allow the application handle to be stored and retrieved later */

static void *SDL_handle = NULL;

void SDL_SetModuleHandle(void *handle)

{

SDL_handle = handle;

}

void *SDL_GetModuleHandle(void)

{

void *handle;

if ( SDL_handle ) {

handle = SDL_handle;

} else {

handle = GetModuleHandle(NULL);

}

return(handle);

}

/* This allows the SDL_WINDOWID hack */

BOOL SDL_windowid = FALSE;

static int app_registered = 0;

/* Register the class for this application -- exported for winmain.c */

int SDL_RegisterApp(char *name, Uint32 style, void *hInst)

{

WNDCLASS class;

#ifdef WM_MOUSELEAVE

HMODULE handle;

#endif

/* Only do this once... */

if ( app_registered ) {

++app_registered;

return(0);

}

#ifndef CS_BYTEALIGNCLIENT

#define CS_BYTEALIGNCLIENT 0

#endif

if ( ! name && ! SDL_Appname ) {

name = "SDL_app";

SDL_Appstyle = CS_BYTEALIGNCLIENT;

SDL_Instance = hInst ? hInst : SDL_GetModuleHandle();

}

if ( name ) {

#ifdef _WIN32_WCE

/* WinCE uses the UNICODE version */

size_t nLen = SDL_strlen(name)+1;

SDL_Appname = SDL_malloc(nLen*2);

MultiByteToWideChar(CP_ACP, 0, name, -1, SDL_Appname, nLen);

#else

size_t nLen = SDL_strlen(name)+1;

SDL_Appname = SDL_malloc(nLen);

SDL_strlcpy(SDL_Appname, name, nLen);

#endif /* _WIN32_WCE */

SDL_Appstyle = style;

SDL_Instance = hInst ? hInst : SDL_GetModuleHandle();

}

/* Register the application class */

class.hCursor = NULL;

class.hIcon = LoadImage(SDL_Instance, SDL_Appname,

IMAGE_ICON,

0, 0, LR_DEFAULTCOLOR);

class.lpszMenuName = NULL;

class.lpszClassName = SDL_Appname;

class.hbrBackground = NULL;

class.hInstance = SDL_Instance;

class.style = SDL_Appstyle;

#if SDL_VIDEO_OPENGL

class.style |= CS_OWNDC;

#endif

class.lpfnWndProc = WinMessage;

class.cbWndExtra = 0;

class.cbClsExtra = 0;

if ( ! RegisterClass(&class) ) {

SDL_SetError("Couldn't register application class");

return(-1);

}

#ifdef WM_MOUSELEAVE

/* Get the version of TrackMouseEvent() we use */

_TrackMouseEvent = NULL;

handle = GetModuleHandle("USER32.DLL");

if ( handle ) {

_TrackMouseEvent = (BOOL (WINAPI *)(TRACKMOUSEEVENT *))GetProcAddress(handle, "TrackMouseEvent");

}

if ( _TrackMouseEvent == NULL ) {

_TrackMouseEvent = WIN_TrackMouseEvent;

}

#endif /* WM_MOUSELEAVE */

#ifndef NO_GETKEYBOARDSTATE

/* Initialise variables for SDL_ToUnicode() */

codepage = GetCodePage();

SDL_ToUnicode = Is9xME() ? ToUnicode9xME : ToUnicode;

#endif

app_registered = 1;

return(0);

}

/* Unregisters the windowclass registered in SDL_RegisterApp above. */

void SDL_UnregisterApp()

{

WNDCLASS class;

/* SDL_RegisterApp might not have been called before */

if ( !app_registered ) {

return;

}

--app_registered;

if ( app_registered == 0 ) {

/* Check for any registered window classes. */

if ( GetClassInfo(SDL_Instance, SDL_Appname, &class) ) {

UnregisterClass(SDL_Appname, SDL_Instance);

}

SDL_free(SDL_Appname);

SDL_Appname = NULL;

}

}

#ifndef NO_GETKEYBOARDSTATE

/* JFP: Implementation of ToUnicode() that works on 9x/ME/2K/XP */

static int Is9xME()

{

OSVERSIONINFO info;

SDL_memset(&info, 0, sizeof(info));

info.dwOSVersionInfoSize = sizeof(info);

if (!GetVersionEx(&info)) {

return 0;

}

return (info.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS);

}

static int GetCodePage()

{

char buff[8];

int lcid = MAKELCID(LOWORD(GetKeyboardLayout(0)), SORT_DEFAULT);

int cp = GetACP();

if (GetLocaleInfo(lcid, LOCALE_IDEFAULTANSICODEPAGE, buff, sizeof(buff))) {

cp = SDL_atoi(buff);

}

return cp;

}

static int WINAPI ToUnicode9xME(UINT vkey, UINT scancode, PBYTE keystate, LPWSTR wchars, int wsize, UINT flags)

{

BYTE chars[2];

if (ToAsciiEx(vkey, scancode, keystate, (WORD*)chars, 0, GetKeyboardLayout(0)) == 1) {

return MultiByteToWideChar(codepage, 0, chars, 1, wchars, wsize);

}

return 0;

}

#endif /* !NO_GETKEYBOARDSTATE */