libvo/w32_common.c

   1 /*
   2  * This file is part of MPlayer.
   3  *
   4  * MPlayer is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * MPlayer is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with MPlayer; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #include <stdio.h>
  20 #include <limits.h>
  21 #include <windows.h>
  22 #include <windowsx.h>
  23
  24 #include "osdep/keycodes.h"
  25 #include "input/input.h"
  26 #include "input/mouse.h"
  27 #include "mp_msg.h"
  28 #include "video_out.h"
  29 #include "aspect.h"
  30 #include "w32_common.h"
  31 #include "mp_fifo.h"
  32
  33 extern int enable_mouse_movements;
  34
  35 #ifndef MONITOR_DEFAULTTOPRIMARY
  36 #define MONITOR_DEFAULTTOPRIMARY 1
  37 #endif
  38
  39 static const char classname[] = "MPlayer - The Movie Player";
  40 int vo_vm = 0;
  41
  42 // last non-fullscreen extends
  43 static int prev_width;
  44 static int prev_height;
  45 static int prev_x;
  46 static int prev_y;
  47
  48 static uint32_t o_dwidth;
  49 static uint32_t o_dheight;
  50
  51 static HINSTANCE hInstance;
  52 #define vo_window vo_w32_window
  53 HWND vo_window = 0;
  54 /** HDC used when rendering to a device instead of window */
  55 static HDC dev_hdc;
  56 static int event_flags;
  57 static int mon_cnt;
  58
  59 static HMONITOR (WINAPI* myMonitorFromWindow)(HWND, DWORD);
  60 static BOOL (WINAPI* myGetMonitorInfo)(HMONITOR, LPMONITORINFO);
  61 static BOOL (WINAPI* myEnumDisplayMonitors)(HDC, LPCRECT, MONITORENUMPROC, LPARAM);
  62
  63 static const struct keymap vk_map[] = {
  64     // special keys
  65     {VK_ESCAPE, KEY_ESC}, {VK_BACK, KEY_BS}, {VK_TAB, KEY_TAB}, {VK_CONTROL, KEY_CTRL},
  66
  67     // cursor keys
  68     {VK_LEFT, KEY_LEFT}, {VK_UP, KEY_UP}, {VK_RIGHT, KEY_RIGHT}, {VK_DOWN, KEY_DOWN},
  69
  70     // navigation block
  71     {VK_INSERT, KEY_INSERT}, {VK_DELETE, KEY_DELETE}, {VK_HOME, KEY_HOME}, {VK_END, KEY_END},
  72     {VK_PRIOR, KEY_PAGE_UP}, {VK_NEXT, KEY_PAGE_DOWN},
  73
  74     // F-keys
  75     {VK_F1, KEY_F+1}, {VK_F2, KEY_F+2}, {VK_F3, KEY_F+3}, {VK_F4, KEY_F+4},
  76     {VK_F5, KEY_F+5}, {VK_F6, KEY_F+6}, {VK_F7, KEY_F+7}, {VK_F8, KEY_F+8},
  77     {VK_F9, KEY_F+9}, {VK_F10, KEY_F+10}, {VK_F11, KEY_F+11}, {VK_F1, KEY_F+12},
  78     // numpad
  79     {VK_NUMPAD0, KEY_KP0}, {VK_NUMPAD1, KEY_KP1}, {VK_NUMPAD2, KEY_KP2},
  80     {VK_NUMPAD3, KEY_KP3}, {VK_NUMPAD4, KEY_KP4}, {VK_NUMPAD5, KEY_KP5},
  81     {VK_NUMPAD6, KEY_KP6}, {VK_NUMPAD7, KEY_KP7}, {VK_NUMPAD8, KEY_KP8},
  82     {VK_NUMPAD9, KEY_KP9}, {VK_DECIMAL, KEY_KPDEC},
  83
  84     {0, 0}
  85 };
  86
  87 static LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) {
  88     RECT r;
  89     POINT p;
  90     int mpkey;
  91     switch (message) {
  92         case WM_ERASEBKGND: // no need to erase background seperately
  93             return 1;
  94         case WM_PAINT:
  95             event_flags |= VO_EVENT_EXPOSE;
  96             break;
  97         case WM_MOVE:
  98             p.x = 0;
  99             p.y = 0;
 100             ClientToScreen(vo_window, &p);
 101             vo_dx = p.x;
 102             vo_dy = p.y;
 103             break;
 104         case WM_SIZE:
 105             event_flags |= VO_EVENT_RESIZE;
 106             GetClientRect(vo_window, &r);
 107             vo_dwidth = r.right;
 108             vo_dheight = r.bottom;
 109             break;
 110         case WM_WINDOWPOSCHANGING:
 111             if (vo_keepaspect && !vo_fs && WinID < 0) {
 112               WINDOWPOS *wpos = lParam;
 113               int xborder, yborder;
 114               r.left = r.top = 0;
 115               r.right = wpos->cx;
 116               r.bottom = wpos->cy;
 117               AdjustWindowRect(&r, GetWindowLong(vo_window, GWL_STYLE), 0);
 118               xborder = (r.right - r.left) - wpos->cx;
 119               yborder = (r.bottom - r.top) - wpos->cy;
 120               wpos->cx -= xborder; wpos->cy -= yborder;
 121               aspect_fit(&wpos->cx, &wpos->cy, wpos->cx, wpos->cy);
 122               wpos->cx += xborder; wpos->cy += yborder;
 123             }
 124             return 0;
 125         case WM_CLOSE:
 126             mplayer_put_key(KEY_CLOSE_WIN);
 127             break;
 128         case WM_SYSCOMMAND:
 129             switch (wParam) {
 130                 case SC_SCREENSAVE:
 131                 case SC_MONITORPOWER:
 132                     mp_msg(MSGT_VO, MSGL_V, "vo: win32: killing screensaver\n");
 133                     return 0;
 134             }
 135             break;
 136         case WM_KEYDOWN:
 137             mpkey = lookup_keymap_table(vk_map, wParam);
 138             if (mpkey)
 139                 mplayer_put_key(mpkey);
 140             break;
 141         case WM_CHAR:
 142             mplayer_put_key(wParam);
 143             break;
 144         case WM_LBUTTONDOWN:
 145             if (!vo_nomouse_input && (vo_fs || (wParam & MK_CONTROL))) {
 146                 mplayer_put_key(MOUSE_BTN0);
 147                 break;
 148             }
 149             if (!vo_fs) {
 150                 ReleaseCapture();
 151                 SendMessage(hWnd, WM_NCLBUTTONDOWN, HTCAPTION, 0);
 152                 return 0;
 153             }
 154             break;
 155         case WM_MBUTTONDOWN:
 156             if (!vo_nomouse_input)
 157                 mplayer_put_key(MOUSE_BTN1);
 158             break;
 159         case WM_RBUTTONDOWN:
 160             if (!vo_nomouse_input)
 161                 mplayer_put_key(MOUSE_BTN2);
 162             break;
 163         case WM_MOUSEMOVE:
 164             if (enable_mouse_movements) {
 165                 char cmd_str[40];
 166                 snprintf(cmd_str, sizeof(cmd_str), "set_mouse_pos %i %i",
 167                         GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam));
 168                 mp_input_queue_cmd(mp_input_parse_cmd(cmd_str));
 169             }
 170             break;
 171         case WM_MOUSEWHEEL:
 172             if (!vo_nomouse_input) {
 173                 int x = GET_WHEEL_DELTA_WPARAM(wParam);
 174                 if (x > 0)
 175                     mplayer_put_key(MOUSE_BTN3);
 176                 else
 177                     mplayer_put_key(MOUSE_BTN4);
 178                 break;
 179             }
 180     }
 181
 182     return DefWindowProc(hWnd, message, wParam, lParam);
 183 }
 184
 185 /**
 186  * \brief Dispatch incoming window events and handle them.
 187  *
 188  * This function should be placed inside libvo's function "check_events".
 189  *
 190  * Global libvo variables changed:
 191  * vo_dwidth:  new window client area width
 192  * vo_dheight: new window client area height
 193  *
 194  * \return int with these flags possibly set, take care to handle in the right order
 195  *         if it matters in your driver:
 196  *
 197  * VO_EVENT_RESIZE = The window was resized. If necessary reinit your
 198  *                   driver render context accordingly.
 199  * VO_EVENT_EXPOSE = The window was exposed. Call e.g. flip_frame() to redraw
 200  *                   the window if the movie is paused.
 201  */
 202 int vo_w32_check_events(void) {
 203     MSG msg;
 204     event_flags = 0;
 205     while (PeekMessage(&msg, 0, 0, 0, PM_REMOVE)) {
 206         TranslateMessage(&msg);
 207         DispatchMessage(&msg);
 208     }
 209     if (WinID >= 0) {
 210         RECT r;
 211         GetClientRect(vo_window, &r);
 212         if (r.right != vo_dwidth || r.bottom != vo_dheight) {
 213             vo_dwidth = r.right; vo_dheight = r.bottom;
 214             event_flags |= VO_EVENT_RESIZE;
 215         }
 216         GetClientRect(WinID, &r);
 217         if (r.right != vo_dwidth || r.bottom != vo_dheight)
 218             MoveWindow(vo_window, 0, 0, r.right, r.bottom, FALSE);
 219     }
 220
 221     return event_flags;
 222 }
 223
 224 static BOOL CALLBACK mon_enum(HMONITOR hmon, HDC hdc, LPRECT r, LPARAM p) {
 225     // this defaults to the last screen if specified number does not exist
 226     xinerama_x = r->left;
 227     xinerama_y = r->top;
 228     vo_screenwidth = r->right - r->left;
 229     vo_screenheight = r->bottom - r->top;
 230     if (mon_cnt == xinerama_screen)
 231         return FALSE;
 232     mon_cnt++;
 233     return TRUE;
 234 }
 235
 236 /**
 237  * \brief Update screen information.
 238  *
 239  * This function should be called in libvo's "control" callback
 240  * with parameter VOCTRL_UPDATE_SCREENINFO.
 241  * Note that this also enables the new API where geometry and aspect
 242  * calculations are done in video_out.c:config_video_out
 243  *
 244  * Global libvo variables changed:
 245  * xinerama_x
 246  * xinerama_y
 247  * vo_screenwidth
 248  * vo_screenheight
 249  */
 250 void w32_update_xinerama_info(void) {
 251     xinerama_x = xinerama_y = 0;
 252     if (xinerama_screen < -1) {
 253         int tmp;
 254         xinerama_x = GetSystemMetrics(SM_XVIRTUALSCREEN);
 255         xinerama_y = GetSystemMetrics(SM_YVIRTUALSCREEN);
 256         tmp = GetSystemMetrics(SM_CXVIRTUALSCREEN);
 257         if (tmp) vo_screenwidth = tmp;
 258         tmp = GetSystemMetrics(SM_CYVIRTUALSCREEN);
 259         if (tmp) vo_screenheight = tmp;
 260     } else if (xinerama_screen == -1 && myMonitorFromWindow && myGetMonitorInfo) {
 261         MONITORINFO mi;
 262         HMONITOR m = myMonitorFromWindow(vo_window, MONITOR_DEFAULTTOPRIMARY);
 263         mi.cbSize = sizeof(mi);
 264         myGetMonitorInfo(m, &mi);
 265         xinerama_x = mi.rcMonitor.left;
 266         xinerama_y = mi.rcMonitor.top;
 267         vo_screenwidth = mi.rcMonitor.right - mi.rcMonitor.left;
 268         vo_screenheight = mi.rcMonitor.bottom - mi.rcMonitor.top;
 269     } else if (xinerama_screen > 0 && myEnumDisplayMonitors) {
 270         mon_cnt = 0;
 271         myEnumDisplayMonitors(NULL, NULL, mon_enum, 0);
 272     }
 273     aspect_save_screenres(vo_screenwidth, vo_screenheight);
 274 }
 275
 276 static void updateScreenProperties(void) {
 277     DEVMODE dm;
 278     dm.dmSize = sizeof dm;
 279     dm.dmDriverExtra = 0;
 280     dm.dmFields = DM_BITSPERPEL | DM_PELSWIDTH | DM_PELSHEIGHT;
 281     if (!EnumDisplaySettings(0, ENUM_CURRENT_SETTINGS, &dm)) {
 282         mp_msg(MSGT_VO, MSGL_ERR, "vo: win32: unable to enumerate display settings!\n");
 283         return;
 284     }
 285
 286     vo_screenwidth = dm.dmPelsWidth;
 287     vo_screenheight = dm.dmPelsHeight;
 288     vo_depthonscreen = dm.dmBitsPerPel;
 289     w32_update_xinerama_info();
 290 }
 291
 292 static void changeMode(void) {
 293     DEVMODE dm;
 294     dm.dmSize = sizeof dm;
 295     dm.dmDriverExtra = 0;
 296
 297     dm.dmFields = DM_BITSPERPEL | DM_PELSWIDTH | DM_PELSHEIGHT;
 298     dm.dmBitsPerPel = vo_depthonscreen;
 299     dm.dmPelsWidth = vo_screenwidth;
 300     dm.dmPelsHeight = vo_screenheight;
 301
 302     if (vo_vm) {
 303         int bestMode = -1;
 304         int bestScore = INT_MAX;
 305         int i;
 306         for (i = 0; EnumDisplaySettings(0, i, &dm); ++i) {
 307             int score = (dm.dmPelsWidth - o_dwidth) * (dm.dmPelsHeight - o_dheight);
 308             if (dm.dmBitsPerPel != vo_depthonscreen) continue;
 309             if (dm.dmPelsWidth < o_dwidth) continue;
 310             if (dm.dmPelsHeight < o_dheight) continue;
 311
 312             if (score < bestScore) {
 313                 bestScore = score;
 314                 bestMode = i;
 315             }
 316         }
 317
 318         if (bestMode != -1)
 319             EnumDisplaySettings(0, bestMode, &dm);
 320
 321     ChangeDisplaySettings(&dm, CDS_FULLSCREEN);
 322     }
 323 }
 324
 325 static void resetMode(void) {
 326     if (vo_vm)
 327     ChangeDisplaySettings(0, 0);
 328 }
 329
 330 static int createRenderingContext(void) {
 331     HWND layer = HWND_NOTOPMOST;
 332     PIXELFORMATDESCRIPTOR pfd;
 333     HDC vo_hdc = vo_w32_get_dc(vo_window);
 334     RECT r;
 335     int pf;
 336   if (WinID < 0) {
 337     int style = (vo_border && !vo_fs) ?
 338                 (WS_OVERLAPPEDWINDOW | WS_SIZEBOX) : WS_POPUP;
 339
 340     if (vo_fs || vo_ontop) layer = HWND_TOPMOST;
 341     if (vo_fs) {
 342         changeMode();
 343         while (ShowCursor(0) >= 0) /**/ ;
 344     } else {
 345         resetMode();
 346         while (ShowCursor(1) < 0) /**/ ;
 347     }
 348     updateScreenProperties();
 349     ShowWindow(vo_window, SW_HIDE);
 350     SetWindowLong(vo_window, GWL_STYLE, style);
 351     if (vo_fs) {
 352         prev_width = vo_dwidth;
 353         prev_height = vo_dheight;
 354         prev_x = vo_dx;
 355         prev_y = vo_dy;
 356         vo_dwidth = vo_screenwidth;
 357         vo_dheight = vo_screenheight;
 358         vo_dx = xinerama_x;
 359         vo_dy = xinerama_y;
 360     } else {
 361         // make sure there are no "stale" resize events
 362         // that would set vo_d* to wrong values
 363         vo_w32_check_events();
 364         vo_dwidth = prev_width;
 365         vo_dheight = prev_height;
 366         vo_dx = prev_x;
 367         vo_dy = prev_y;
 368         // HACK around what probably is a windows focus bug:
 369         // when pressing 'f' on the console, then 'f' again to
 370         // return to windowed mode, any input into the video
 371         // window is lost forever.
 372         SetFocus(vo_window);
 373     }
 374     r.left = vo_dx;
 375     r.right = r.left + vo_dwidth;
 376     r.top = vo_dy;
 377     r.bottom = r.top + vo_dheight;
 378     AdjustWindowRect(&r, style, 0);
 379     SetWindowPos(vo_window, layer, r.left, r.top, r.right - r.left, r.bottom - r.top, SWP_SHOWWINDOW);
 380   }
 381
 382     memset(&pfd, 0, sizeof pfd);
 383     pfd.nSize = sizeof pfd;
 384     pfd.nVersion = 1;
 385     pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
 386     pfd.iPixelType = PFD_TYPE_RGBA;
 387     pfd.cColorBits = 24;
 388     pfd.iLayerType = PFD_MAIN_PLANE;
 389     pf = ChoosePixelFormat(vo_hdc, &pfd);
 390     if (!pf) {
 391             mp_msg(MSGT_VO, MSGL_ERR, "vo: win32: unable to select a valid pixel format!\n");
 392         ReleaseDC(vo_window, vo_hdc);
 393         return 0;
 394     }
 395
 396     SetPixelFormat(vo_hdc, pf, &pfd);
 397
 398     mp_msg(MSGT_VO, MSGL_V, "vo: win32: running at %dx%d with depth %d\n", vo_screenwidth, vo_screenheight, vo_depthonscreen);
 399
 400     vo_w32_release_dc(vo_window, vo_hdc);
 401     return 1;
 402 }
 403
 404 /**
 405  * \brief Configure and show window on the screen.
 406  *
 407  * This function should be called in libvo's "config" callback.
 408  * It configures a window and shows it on the screen.
 409  *
 410  * Global libvo variables changed:
 411  * vo_fs
 412  * vo_vm
 413  *
 414  * \return 1 - Success, 0 - Failure
 415  */
 416 int vo_w32_config(uint32_t width, uint32_t height, uint32_t flags) {
 417     // store original size for videomode switching
 418     o_dwidth = width;
 419     o_dheight = height;
 420
 421     if (WinID < 0) {
 422         // the desired size is ignored in wid mode, it always matches the window size.
 423         prev_width = vo_dwidth = width;
 424         prev_height = vo_dheight = height;
 425         prev_x = vo_dx;
 426         prev_y = vo_dy;
 427     }
 428
 429     vo_fs = flags & VOFLAG_FULLSCREEN;
 430     vo_vm = flags & VOFLAG_MODESWITCHING;
 431     return createRenderingContext();
 432 }
 433
 434 /**
 435  * \brief return the name of the selected device if it is indepedant
 436  */
 437 static char *get_display_name(void) {
 438     DISPLAY_DEVICE disp;
 439     disp.cb = sizeof(disp);
 440     EnumDisplayDevices(NULL, vo_adapter_num, &disp, 0);
 441     if (disp.StateFlags & DISPLAY_DEVICE_ATTACHED_TO_DESKTOP)
 442         return NULL;
 443     return disp.DeviceName;
 444 }
 445
 446 /**
 447  * \brief Initialize w32_common framework.
 448  *
 449  * The first function that should be called from the w32_common framework.
 450  * It handles window creation on the screen with proper title and attributes.
 451  * It also initializes the framework's internal variables. The function should
 452  * be called after your own preinit initialization and you shouldn't do any
 453  * window management on your own.
 454  *
 455  * Global libvo variables changed:
 456  * vo_w32_window
 457  * vo_depthonscreen
 458  * vo_screenwidth
 459  * vo_screenheight
 460  *
 461  * \return 1 = Success, 0 = Failure
 462  */
 463 int vo_w32_init(void) {
 464     HICON mplayerIcon = 0;
 465     char exedir[MAX_PATH];
 466     HINSTANCE user32;
 467     char *dev;
 468
 469     if (vo_window)
 470         return 1;
 471
 472     hInstance = GetModuleHandle(0);
 473
 474     if (GetModuleFileName(0, exedir, MAX_PATH))
 475         mplayerIcon = ExtractIcon(hInstance, exedir, 0);
 476     if (!mplayerIcon)
 477         mplayerIcon = LoadIcon(0, IDI_APPLICATION);
 478
 479   {
 480     WNDCLASSEX wcex = { sizeof wcex, CS_OWNDC | CS_DBLCLKS, WndProc, 0, 0, hInstance, mplayerIcon, LoadCursor(0, IDC_ARROW), NULL, 0, classname, mplayerIcon };
 481
 482     if (!RegisterClassEx(&wcex)) {
 483         mp_msg(MSGT_VO, MSGL_ERR, "vo: win32: unable to register window class!\n");
 484         return 0;
 485     }
 486   }
 487
 488     if (WinID >= 0)
 489     {
 490         RECT r;
 491         GetClientRect(WinID, &r);
 492         vo_dwidth = r.right; vo_dheight = r.bottom;
 493         vo_window = CreateWindowEx(WS_EX_NOPARENTNOTIFY, classname, classname,
 494                      WS_CHILD | WS_VISIBLE,
 495                      0, 0, vo_dwidth, vo_dheight, WinID, 0, hInstance, 0);
 496         EnableWindow(vo_window, 0);
 497     } else
 498     vo_window = CreateWindowEx(0, classname, classname,
 499                   vo_border ? (WS_OVERLAPPEDWINDOW | WS_SIZEBOX) : WS_POPUP,
 500                   CW_USEDEFAULT, 0, 100, 100, 0, 0, hInstance, 0);
 501     if (!vo_window) {
 502         mp_msg(MSGT_VO, MSGL_ERR, "vo: win32: unable to create window!\n");
 503         return 0;
 504     }
 505
 506     myMonitorFromWindow = NULL;
 507     myGetMonitorInfo = NULL;
 508     myEnumDisplayMonitors = NULL;
 509     user32 = GetModuleHandle("user32.dll");
 510     if (user32) {
 511         myMonitorFromWindow = (void *)GetProcAddress(user32, "MonitorFromWindow");
 512         myGetMonitorInfo = GetProcAddress(user32, "GetMonitorInfoA");
 513         myEnumDisplayMonitors = GetProcAddress(user32, "EnumDisplayMonitors");
 514     }
 515     dev_hdc = 0;
 516     dev = get_display_name();
 517     if (dev) dev_hdc = CreateDC(dev, NULL, NULL, NULL);
 518     updateScreenProperties();
 519
 520     return 1;
 521 }
 522
 523 /**
 524  * \brief Toogle fullscreen / windowed mode.
 525  *
 526  * Should be called on VOCTRL_FULLSCREEN event. The window is
 527  * always resized after this call, so the rendering context
 528  * should be reinitialized with the new dimensions.
 529  * It is unspecified if vo_check_events will create a resize
 530  * event in addition or not.
 531  *
 532  * Global libvo variables changed:
 533  * vo_dwidth
 534  * vo_dheight
 535  * vo_fs
 536  */
 537
 538 void vo_w32_fullscreen(void) {
 539     vo_fs = !vo_fs;
 540
 541     createRenderingContext();
 542 }
 543
 544 /**
 545  * \brief Toogle window border attribute.
 546  *
 547  * Should be called on VOCTRL_BORDER event.
 548  *
 549  * Global libvo variables changed:
 550  * vo_border
 551  */
 552 void vo_w32_border(void) {
 553     vo_border = !vo_border;
 554     createRenderingContext();
 555 }
 556
 557 /**
 558  * \brief Toogle window ontop attribute.
 559  *
 560  * Should be called on VOCTRL_ONTOP event.
 561  *
 562  * Global libvo variables changed:
 563  * vo_ontop
 564  */
 565 void vo_w32_ontop( void )
 566 {
 567     vo_ontop = !vo_ontop;
 568     if (!vo_fs) {
 569         createRenderingContext();
 570     }
 571 }
 572
 573 /**
 574  * \brief Uninitialize w32_common framework.
 575  *
 576  * Should be called last in video driver's uninit function. First release
 577  * anything built on top of the created window e.g. rendering context inside
 578  * and call vo_w32_uninit at the end.
 579  */
 580 void vo_w32_uninit(void) {
 581     mp_msg(MSGT_VO, MSGL_V, "vo: win32: uninit\n");
 582     resetMode();
 583     ShowCursor(1);
 584     vo_depthonscreen = 0;
 585     if (dev_hdc) DeleteDC(dev_hdc);
 586     dev_hdc = 0;
 587     DestroyWindow(vo_window);
 588     vo_window = 0;
 589     UnregisterClass(classname, 0);
 590 }
 591
 592 /**
 593  * \brief get a device context to draw in
 594  *
 595  * \param wnd window the DC should belong to if it makes sense
 596  */
 597 HDC vo_w32_get_dc(HWND wnd) {
 598     if (dev_hdc) return dev_hdc;
 599     return GetDC(wnd);
 600 }
 601
 602 /**
 603  * \brief release a device context
 604  *
 605  * \param wnd window the DC probably belongs to
 606  */
 607 void vo_w32_release_dc(HWND wnd, HDC dc) {
 608     if (dev_hdc) return;
 609     ReleaseDC(wnd, dc);
 610 }