git.sesse.net Git - vlc/blob - modules/video_output/directx/events.c

   1 /*****************************************************************************
   2  * events.c: Windows DirectX video output events handler
   3  *****************************************************************************
   4  * Copyright (C) 2001 VideoLAN
   5  * $Id: events.c,v 1.2 2002/10/01 20:43:35 ipkiss Exp $
   6  *
   7  * Authors: Gildas Bazin <gbazin@netcourrier.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  22  *****************************************************************************/
  23
  24
  25 /*****************************************************************************
  26  * Preamble: This file contains the functions related to the creation of
  27  *             a window and the handling of its messages (events).
  28  *****************************************************************************/
  29 #include <errno.h>                                                 /* ENOMEM */
  30 #include <stdlib.h>                                                /* free() */
  31 #include <string.h>                                            /* strerror() */
  32
  33 #include <vlc/vlc.h>
  34 #include <vlc/intf.h>
  35 #include <vlc/vout.h>
  36
  37 #include "netutils.h"
  38
  39 #include <windows.h>
  40 #include <windowsx.h>
  41 #include <shellapi.h>
  42
  43 #include <ddraw.h>
  44
  45 #include "vout.h"
  46
  47 /*****************************************************************************
  48  * Local prototypes.
  49  *****************************************************************************/
  50 static int  DirectXCreateWindow( vout_thread_t *p_vout );
  51 static void DirectXCloseWindow ( vout_thread_t *p_vout );
  52 static void DirectXUpdateRects( vout_thread_t *p_vout );
  53 static long FAR PASCAL DirectXEventProc ( HWND hwnd, UINT message,
  54                                           WPARAM wParam, LPARAM lParam );
  55
  56 /*****************************************************************************
  57  * DirectXEventThread: Create video window & handle its messages
  58  *****************************************************************************
  59  * This function creates a video window and then enters an infinite loop
  60  * that handles the messages sent to that window.
  61  * The main goal of this thread is to isolate the Win32 PeekMessage function
  62  * because this one can block for a long time.
  63  *****************************************************************************/
  64 void DirectXEventThread( event_thread_t *p_event )
  65 {
  66     MSG msg;
  67     POINT old_mouse_pos;
  68
  69     /* Initialisation */
  70
  71     /* Create a window for the video */
  72     /* Creating a window under Windows also initializes the thread's event
  73      * message qeue */
  74     if( DirectXCreateWindow( p_event->p_vout ) )
  75     {
  76         msg_Err( p_event, "out of memory" );
  77         p_event->b_dead = 1;
  78     }
  79
  80     /* signal the creation of the window */
  81     vlc_thread_ready( p_event );
  82
  83     /* Main loop */
  84     /* GetMessage will sleep if there's no message in the queue */
  85     while( !p_event->b_die
  86            && GetMessage( &msg, p_event->p_vout->p_sys->hwnd, 0, 0 ) )
  87     {
  88         /* Check if we are asked to exit */
  89         if( p_event->b_die )
  90             break;
  91
  92         switch( msg.message )
  93         {
  94
  95         case WM_NCMOUSEMOVE:
  96         case WM_MOUSEMOVE:
  97             if( (abs(GET_X_LPARAM(msg.lParam) - old_mouse_pos.x) > 2 ||
  98                 (abs(GET_Y_LPARAM(msg.lParam) - old_mouse_pos.y)) > 2 ) )
  99             {
 100                 GetCursorPos( &old_mouse_pos );
 101                 p_event->p_vout->p_sys->i_lastmoved = mdate();
 102
 103                 if( p_event->p_vout->p_sys->b_cursor_hidden )
 104                 {
 105                     p_event->p_vout->p_sys->b_cursor_hidden = 0;
 106                     ShowCursor( TRUE );
 107                 }
 108             }
 109             break;
 110
 111         case WM_VLC_HIDE_MOUSE:
 112             GetCursorPos( &old_mouse_pos );
 113             ShowCursor( FALSE );
 114             break;
 115
 116         case WM_RBUTTONUP:
 117             {
 118                 intf_thread_t *p_intf;
 119                 p_intf = vlc_object_find( p_event, VLC_OBJECT_INTF,
 120                                                    FIND_ANYWHERE );
 121                 if( p_intf )
 122                 {
 123                     p_intf->b_menu_change = 1;
 124                     vlc_object_release( p_intf );
 125                 }
 126             }
 127             break;
 128
 129         case WM_LBUTTONDOWN:
 130             break;
 131
 132         case WM_LBUTTONDBLCLK:
 133             p_event->p_vout->p_sys->i_changes |= VOUT_FULLSCREEN_CHANGE;
 134             break;
 135
 136         case WM_KEYDOWN:
 137             /* the key events are first processed here. The next
 138              * message processed by this main message loop will be the
 139              * char translation of the key event */
 140             msg_Dbg( p_event, "WM_KEYDOWN" );
 141             switch( msg.wParam )
 142             {
 143             case VK_ESCAPE:
 144                 /* exit application */
 145                 p_event->p_vlc->b_die = 1;
 146                 break;
 147
 148             case VK_F1: network_ChannelJoin( p_event, 1 ); break;
 149             case VK_F2: network_ChannelJoin( p_event, 2 ); break;
 150             case VK_F3: network_ChannelJoin( p_event, 3 ); break;
 151             case VK_F4: network_ChannelJoin( p_event, 4 ); break;
 152             case VK_F5: network_ChannelJoin( p_event, 5 ); break;
 153             case VK_F6: network_ChannelJoin( p_event, 6 ); break;
 154             case VK_F7: network_ChannelJoin( p_event, 7 ); break;
 155             case VK_F8: network_ChannelJoin( p_event, 8 ); break;
 156             case VK_F9: network_ChannelJoin( p_event, 9 ); break;
 157             case VK_F10: network_ChannelJoin( p_event, 10 ); break;
 158             case VK_F11: network_ChannelJoin( p_event, 11 ); break;
 159             case VK_F12: network_ChannelJoin( p_event, 12 ); break;
 160             }
 161             TranslateMessage(&msg);
 162             break;
 163
 164         case WM_CHAR:
 165             switch( msg.wParam )
 166             {
 167             case 'q':
 168             case 'Q':
 169                 /* exit application */
 170                 p_event->p_vlc->b_die = 1;
 171                 break;
 172
 173             case 'f':                            /* switch to fullscreen */
 174             case 'F':
 175                 p_event->p_vout->p_sys->i_changes |= VOUT_FULLSCREEN_CHANGE;
 176                 break;
 177
 178             case 'c':                                /* toggle grayscale */
 179             case 'C':
 180                 p_event->p_vout->b_grayscale = ! p_event->p_vout->b_grayscale;
 181                 p_event->p_vout->p_sys->i_changes |= VOUT_GRAYSCALE_CHANGE;
 182                 break;
 183
 184             case 'i':                                     /* toggle info */
 185             case 'I':
 186                 p_event->p_vout->b_info = ! p_event->p_vout->b_info;
 187                 p_event->p_vout->p_sys->i_changes |= VOUT_INFO_CHANGE;
 188                 break;
 189
 190             case 's':                                  /* toggle scaling */
 191             case 'S':
 192                 p_event->p_vout->b_scale = ! p_event->p_vout->b_scale;
 193                 p_event->p_vout->p_sys->i_changes |= VOUT_SCALE_CHANGE;
 194                 break;
 195
 196             case ' ':                                /* toggle interface */
 197                 p_event->p_vout->b_interface = ! p_event->p_vout->b_interface;
 198                 p_event->p_vout->p_sys->i_changes |= VOUT_INTF_CHANGE;
 199                 break;
 200
 201             default:
 202                 break;
 203             }
 204
 205         default:
 206             /* Messages we don't handle directly are dispatched to the
 207              * window procedure */
 208             TranslateMessage(&msg);
 209             DispatchMessage(&msg);
 210             break;
 211
 212         } /* End Switch */
 213
 214     } /* End Main loop */
 215
 216     if( msg.message == WM_QUIT )
 217     {
 218         msg_Warn( p_event, "WM_QUIT... should not happen!!" );
 219         p_event->p_vout->p_sys->hwnd = NULL; /* Window already destroyed */
 220     }
 221
 222     msg_Dbg( p_event, "DirectXEventThread Terminating" );
 223
 224     /* clear the changes formerly signaled */
 225     p_event->p_vout->p_sys->i_changes = 0;
 226
 227     DirectXCloseWindow( p_event->p_vout );
 228 }
 229
 230
 231 /* following functions are local */
 232
 233 /*****************************************************************************
 234  * DirectXCreateWindow: create a window for the video.
 235  *****************************************************************************
 236  * Before creating a direct draw surface, we need to create a window in which
 237  * the video will be displayed. This window will also allow us to capture the
 238  * events.
 239  *****************************************************************************/
 240 static int DirectXCreateWindow( vout_thread_t *p_vout )
 241 {
 242     HINSTANCE  hInstance;
 243     WNDCLASSEX wc;                                /* window class components */
 244     RECT       rect_window;
 245     COLORREF   colorkey;
 246     HDC        hdc;
 247     HMENU      hMenu;
 248     HICON      vlc_icon = NULL;
 249     char       vlc_path[_MAX_PATH+1];
 250
 251     msg_Dbg( p_vout, "DirectXCreateWindow" );
 252
 253     /* get this module's instance */
 254     hInstance = GetModuleHandle(NULL);
 255
 256     /* Create a BRUSH that will be used by Windows to paint the window
 257      * background.
 258      * This window background is important for us as it will be used by the
 259      * graphics card to display the overlay.
 260      * This is why we carefully choose the color for this background, the goal
 261      * being to choose a color which isn't complete black but nearly. We
 262      * obviously don't want to use black as a colorkey for the overlay because
 263      * black is one of the most used color and thus would give us undesirable
 264      * effects */
 265     /* the first step is to find the colorkey we want to use. The difficulty
 266      * comes from the potential dithering (depends on the display depth)
 267      * because we need to know the real RGB value of the chosen colorkey */
 268     hdc = GetDC( NULL );
 269     for( colorkey = 5; colorkey < 0xFF /*all shades of red*/; colorkey++ )
 270     {
 271         if( colorkey == GetNearestColor( hdc, colorkey ) )
 272           break;
 273     }
 274     msg_Dbg( p_vout, "background color: %i", colorkey );
 275
 276     /* create the actual brush */
 277     p_vout->p_sys->hbrush = CreateSolidBrush(colorkey);
 278     p_vout->p_sys->i_rgb_colorkey = (int)colorkey;
 279
 280     /* Get the current size of the display and its colour depth */
 281     p_vout->p_sys->rect_display.right = GetDeviceCaps( hdc, HORZRES );
 282     p_vout->p_sys->rect_display.bottom = GetDeviceCaps( hdc, VERTRES );
 283     p_vout->p_sys->i_display_depth = GetDeviceCaps( hdc, BITSPIXEL );
 284     msg_Dbg( p_vout, "screen dimensions %ix%i colour depth %i",
 285                       p_vout->p_sys->rect_display.right,
 286                       p_vout->p_sys->rect_display.bottom,
 287                       p_vout->p_sys->i_display_depth );
 288
 289     ReleaseDC( NULL, hdc );
 290
 291     /* Get the Icon from the main app */
 292     vlc_icon = NULL;
 293     if( GetModuleFileName( NULL, vlc_path, _MAX_PATH ) )
 294     {
 295         vlc_icon = ExtractIcon( hInstance, vlc_path, 0 );
 296     }
 297
 298
 299     /* fill in the window class structure */
 300     wc.cbSize        = sizeof(WNDCLASSEX);
 301     wc.style         = CS_DBLCLKS;                       /* style: dbl click */
 302     wc.lpfnWndProc   = (WNDPROC)DirectXEventProc;           /* event handler */
 303     wc.cbClsExtra    = 0;                             /* no extra class data */
 304     wc.cbWndExtra    = 0;                            /* no extra window data */
 305     wc.hInstance     = hInstance;                                /* instance */
 306     wc.hIcon         = vlc_icon;                        /* load the vlc icon */
 307     wc.hCursor       = LoadCursor(NULL, IDC_ARROW); /* load a default cursor */
 308     wc.hbrBackground = p_vout->p_sys->hbrush;            /* background color */
 309     wc.lpszMenuName  = NULL;                                      /* no menu */
 310     wc.lpszClassName = "VLC DirectX";                 /* use a special class */
 311     wc.hIconSm       = vlc_icon;                        /* load the vlc icon */
 312
 313     /* register the window class */
 314     if (!RegisterClassEx(&wc))
 315     {
 316         WNDCLASS wndclass;
 317
 318         /* free window background brush */
 319         if( p_vout->p_sys->hbrush )
 320         {
 321             DeleteObject( p_vout->p_sys->hbrush );
 322             p_vout->p_sys->hbrush = NULL;
 323         }
 324
 325         if( vlc_icon )
 326             DestroyIcon( vlc_icon );
 327
 328         /* Check why it failed. If it's because one already exists then fine */
 329         if( !GetClassInfo( hInstance, "VLC DirectX", &wndclass ) )
 330         {
 331             msg_Err( p_vout, "DirectXCreateWindow RegisterClass FAILED" );
 332             return (1);
 333         }
 334     }
 335
 336     /* when you create a window you give the dimensions you wish it to have.
 337      * Unfortunatly these dimensions will include the borders and title bar.
 338      * We use the following function to find out the size of the window
 339      * corresponding to the useable surface we want */
 340     rect_window.top    = 10;
 341     rect_window.left   = 10;
 342     rect_window.right  = rect_window.left + p_vout->p_sys->i_window_width;
 343     rect_window.bottom = rect_window.top + p_vout->p_sys->i_window_height;
 344     AdjustWindowRect( &rect_window, WS_OVERLAPPEDWINDOW|WS_SIZEBOX, 0 );
 345
 346     /* create the window */
 347     p_vout->p_sys->hwnd = CreateWindow("VLC DirectX",/* name of window class */
 348                     VOUT_TITLE " (DirectX Output)", /* window title bar text */
 349                     WS_OVERLAPPEDWINDOW
 350                     | WS_SIZEBOX,               /* window style */
 351                     CW_USEDEFAULT,                   /* default X coordinate */
 352                     0,                               /* default Y coordinate */
 353                     rect_window.right - rect_window.left,    /* window width */
 354                     rect_window.bottom - rect_window.top,   /* window height */
 355                     NULL,                                /* no parent window */
 356                     NULL,                          /* no menu in this window */
 357                     hInstance,            /* handle of this program instance */
 358                     NULL);                        /* no additional arguments */
 359
 360     if (p_vout->p_sys->hwnd == NULL) {
 361         msg_Warn( p_vout, "DirectXCreateWindow create window FAILED" );
 362         return (1);
 363     }
 364
 365     /* store a p_vout pointer into the window local storage (for later use
 366      * in DirectXEventProc).
 367      * We need to use SetWindowLongPtr when it is available in mingw */
 368     SetWindowLong( p_vout->p_sys->hwnd, GWL_USERDATA, (LONG)p_vout );
 369
 370     /* append a "Always On Top" entry in the system menu */
 371     hMenu = GetSystemMenu( p_vout->p_sys->hwnd, FALSE );
 372     AppendMenu( hMenu, MF_SEPARATOR, 0, "" );
 373     AppendMenu( hMenu, MF_STRING | MF_UNCHECKED, IDM_TOGGLE_ON_TOP, "Always on &Top");
 374
 375     /* now display the window */
 376     ShowWindow(p_vout->p_sys->hwnd, SW_SHOW);
 377
 378     return ( 0 );
 379 }
 380
 381 /*****************************************************************************
 382  * DirectXCloseWindow: close the window created by DirectXCreateWindow
 383  *****************************************************************************
 384  * This function returns all resources allocated by DirectXCreateWindow.
 385  *****************************************************************************/
 386 static void DirectXCloseWindow( vout_thread_t *p_vout )
 387 {
 388     msg_Dbg( p_vout, "DirectXCloseWindow" );
 389
 390     if( p_vout->p_sys->hwnd != NULL )
 391     {
 392         DestroyWindow( p_vout->p_sys->hwnd );
 393         p_vout->p_sys->hwnd = NULL;
 394     }
 395
 396     /* We don't unregister the Window Class because it could lead to race
 397      * conditions and it will be done anyway by the system when the app will
 398      * exit */
 399 }
 400
 401 /*****************************************************************************
 402  * DirectXUpdateRects:
 403  *****************************************************************************
 404  * This function is called when the window position and size is changed, and
 405  * its job is to update the source and destination RECTs used to display the
 406  * picture.
 407  *****************************************************************************/
 408 static void DirectXUpdateRects( vout_thread_t *p_vout )
 409 {
 410     int i_width, i_height, i_x, i_y;
 411
 412 #define rect_src p_vout->p_sys->rect_src
 413 #define rect_src_clipped p_vout->p_sys->rect_src_clipped
 414 #define rect_dest p_vout->p_sys->rect_dest
 415 #define rect_dest_clipped p_vout->p_sys->rect_dest_clipped
 416 #define rect_display p_vout->p_sys->rect_display
 417
 418     vout_PlacePicture( p_vout, p_vout->p_sys->i_window_width,
 419                        p_vout->p_sys->i_window_height,
 420                        &i_x, &i_y, &i_width, &i_height );
 421
 422     /* Destination image position and dimensions */
 423     rect_dest.left = i_x + p_vout->p_sys->i_window_x;
 424     rect_dest.top = i_y + p_vout->p_sys->i_window_y;
 425     rect_dest.right = rect_dest.left + i_width;
 426     rect_dest.bottom = rect_dest.top + i_height;
 427
 428
 429     /* UpdateOverlay directdraw function doesn't automatically clip to the
 430      * display size so we need to do it otherwise it will fails */
 431
 432     /* Clip the destination window */
 433     IntersectRect( &rect_dest_clipped, &rect_dest, &rect_display );
 434
 435 #if 0
 436     msg_Dbg( p_vout, "DirectXUpdateRects image_dst_clipped coords:"
 437                      " %i,%i,%i,%i",
 438                      rect_dest_clipped.left, rect_dest_clipped.top,
 439                      rect_dest_clipped.right, rect_dest_clipped.bottom );
 440 #endif
 441
 442     /* the 2 following lines are to fix a bug when clicking on the desktop */
 443     if( (rect_dest_clipped.right - rect_dest_clipped.left)==0 ||
 444         (rect_dest_clipped.bottom - rect_dest_clipped.top)==0 )
 445     {
 446         SetRectEmpty( &rect_src_clipped );
 447         return;
 448     }
 449
 450     /* src image dimensions */
 451     rect_src.left = 0;
 452     rect_src.top = 0;
 453     rect_src.right = p_vout->render.i_width;
 454     rect_src.bottom = p_vout->render.i_height;
 455
 456     /* Clip the source image */
 457     rect_src_clipped.left = (rect_dest_clipped.left - rect_dest.left) *
 458       p_vout->render.i_width / (rect_dest.right - rect_dest.left);
 459     rect_src_clipped.right = p_vout->render.i_width -
 460       (rect_dest.right - rect_dest_clipped.right) * p_vout->render.i_width /
 461       (rect_dest.right - rect_dest.left);
 462     rect_src_clipped.top = (rect_dest_clipped.top - rect_dest.top) *
 463       p_vout->render.i_height / (rect_dest.bottom - rect_dest.top);
 464     rect_src_clipped.bottom = p_vout->render.i_height -
 465       (rect_dest.bottom - rect_dest_clipped.bottom) * p_vout->render.i_height /
 466       (rect_dest.bottom - rect_dest.top);
 467
 468 #if 0
 469     msg_Dbg( p_vout, "DirectXUpdateRects image_src_clipped"
 470                      " coords: %i,%i,%i,%i",
 471                      rect_src_clipped.left, rect_src_clipped.top,
 472                      rect_src_clipped.right, rect_src_clipped.bottom );
 473 #endif
 474
 475 #undef rect_src
 476 #undef rect_src_clipped
 477 #undef rect_dest
 478 #undef rect_dest_clipped
 479 #undef rect_display
 480 }
 481
 482 /*****************************************************************************
 483  * DirectXEventProc: This is the window event processing function.
 484  *****************************************************************************
 485  * On Windows, when you create a window you have to attach an event processing
 486  * function to it. The aim of this function is to manage "Queued Messages" and
 487  * "Nonqueued Messages".
 488  * Queued Messages are those picked up and retransmitted by vout_Manage
 489  * (using the GetMessage and DispatchMessage functions).
 490  * Nonqueued Messages are those that Windows will send directly to this
 491  * procedure (like WM_DESTROY, WM_WINDOWPOSCHANGED...)
 492  *****************************************************************************/
 493 static long FAR PASCAL DirectXEventProc( HWND hwnd, UINT message,
 494                                          WPARAM wParam, LPARAM lParam )
 495 {
 496     vout_thread_t *p_vout =
 497             (vout_thread_t *)GetWindowLong( hwnd, GWL_USERDATA );
 498
 499     switch( message )
 500     {
 501
 502     case WM_WINDOWPOSCHANGED:
 503         {
 504         RECT     rect_window;
 505         POINT    point_window;
 506
 507         /* update the window position */
 508         point_window.x = 0;
 509         point_window.y = 0;
 510         ClientToScreen( hwnd, &point_window );
 511         p_vout->p_sys->i_window_x = point_window.x;
 512         p_vout->p_sys->i_window_y = point_window.y;
 513
 514         /* update the window size */
 515         GetClientRect( hwnd, &rect_window );
 516         p_vout->p_sys->i_window_width = rect_window.right;
 517         p_vout->p_sys->i_window_height = rect_window.bottom;
 518
 519         DirectXUpdateRects( p_vout );
 520         if( p_vout->p_sys->b_using_overlay &&
 521             !p_vout->p_sys->p_event->b_die )
 522             DirectXUpdateOverlay( p_vout );
 523
 524         /* signal the size change */
 525         if( !p_vout->p_sys->b_using_overlay &&
 526             !p_vout->p_sys->p_event->b_die )
 527             p_vout->p_sys->i_changes |= VOUT_SIZE_CHANGE;
 528
 529         return 0;
 530         }
 531         break;
 532
 533     /* the user wants to close the window */
 534     case WM_CLOSE:
 535         msg_Dbg( p_vout, "WinProc WM_CLOSE" );
 536         /* exit application */
 537         p_vout->p_vlc->b_die = 1;
 538         return 0;
 539         break;
 540
 541     /* the window has been closed so shut down everything now */
 542     case WM_DESTROY:
 543         msg_Dbg( p_vout, "WinProc WM_DESTROY" );
 544         /* just destroy the window */
 545         PostQuitMessage( 0 );
 546         return 0;
 547         break;
 548
 549     case WM_SYSCOMMAND:
 550         switch (wParam)
 551         {
 552             case SC_SCREENSAVE:                     /* catch the screensaver */
 553             case SC_MONITORPOWER:              /* catch the monitor turn-off */
 554                 msg_Dbg( p_vout, "WinProc WM_SYSCOMMAND" );
 555                 return 0;                  /* this stops them from happening */
 556             case IDM_TOGGLE_ON_TOP:            /* toggle the "on top" status */
 557             {
 558                 HMENU hMenu = GetSystemMenu( hwnd , FALSE );
 559
 560                 msg_Dbg( p_vout, "WinProc WM_SYSCOMMAND: IDM_TOGGLE_ON_TOP");
 561
 562                 // Check if the window is already on top
 563                 if( GetWindowLong( hwnd, GWL_EXSTYLE ) & WS_EX_TOPMOST )
 564                 {
 565                     CheckMenuItem( hMenu, IDM_TOGGLE_ON_TOP,
 566                                    MF_BYCOMMAND | MFS_UNCHECKED );
 567                     SetWindowPos( hwnd, HWND_NOTOPMOST,
 568                                   0, 0, 0, 0,
 569                                   SWP_NOSIZE | SWP_NOMOVE );
 570                 }
 571                 else
 572                 {
 573                     CheckMenuItem( hMenu, IDM_TOGGLE_ON_TOP,
 574                                    MF_BYCOMMAND | MFS_CHECKED );
 575                     SetWindowPos( hwnd, HWND_TOPMOST,
 576                                   0, 0, 0, 0,
 577                                   SWP_NOSIZE | SWP_NOMOVE );
 578                 }
 579                 return 0;
 580                 break;
 581             }
 582         }
 583         break;
 584
 585     case WM_ERASEBKGND:
 586         if( !p_vout->p_sys->b_using_overlay )
 587         {
 588             /* We want to eliminate unnecessary background redraws which create
 589              * an annoying flickering */
 590             int i_width, i_height, i_x, i_y;
 591             RECT rect_temp;
 592             GetClipBox( (HDC)wParam, &rect_temp );
 593 #if 0
 594             msg_Dbg( p_vout, "WinProc WM_ERASEBKGND %i,%i,%i,%i",
 595                           rect_temp.left, rect_temp.top,
 596                           rect_temp.right, rect_temp.bottom );
 597 #endif
 598             vout_PlacePicture( p_vout, p_vout->p_sys->i_window_width,
 599                                p_vout->p_sys->i_window_height,
 600                                &i_x, &i_y, &i_width, &i_height );
 601             ExcludeClipRect( (HDC)wParam, i_x, i_y,
 602                              i_x + i_width, i_y + i_height );
 603         }
 604         break;
 605
 606     default:
 607         //msg_Dbg( p_vout, "WinProc WM Default %i", message );
 608         break;
 609     }
 610
 611     return DefWindowProc(hwnd, message, wParam, lParam);
 612 }