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 // To get "#define vo_ontop global_vo->opts->vo_ontop" etc
  25 #include "old_vo_defines.h"
  26 #include "osdep/keycodes.h"
  27 #include "osdep/resource.h"
  28 #include "input/input.h"
  29 #include "input/mouse.h"
  30 #include "mp_msg.h"
  31 #include "video_out.h"
  32 #include "aspect.h"
  33 #include "w32_common.h"
  34 #include "mp_fifo.h"
  35
  36 extern int enable_mouse_movements;
  37
  38 #ifndef MONITOR_DEFAULTTOPRIMARY
  39 #define MONITOR_DEFAULTTOPRIMARY 1
  40 #endif
  41
  42 static const char classname[] = "MPlayer - The Movie Player";
  43 int vo_vm = 0;
  44
  45 static int depthonscreen;
  46 // last non-fullscreen extends
  47 static int prev_width;
  48 static int prev_height;
  49 static int prev_x;
  50 static int prev_y;
  51
  52 static uint32_t o_dwidth;
  53 static uint32_t o_dheight;
  54
  55 static HINSTANCE hInstance;
  56 #define vo_window vo_w32_window
  57 HWND vo_window = 0;
  58 /** HDC used when rendering to a device instead of window */
  59 static HDC dev_hdc;
  60 static int event_flags;
  61 static int mon_cnt;
  62
  63 static HMONITOR (WINAPI* myMonitorFromWindow)(HWND, DWORD);
  64 static BOOL (WINAPI* myGetMonitorInfo)(HMONITOR, LPMONITORINFO);
  65 static BOOL (WINAPI* myEnumDisplayMonitors)(HDC, LPCRECT, MONITORENUMPROC, LPARAM);
  66
  67 static const struct keymap vk_map[] = {
  68     // special keys
  69     {VK_ESCAPE, KEY_ESC}, {VK_BACK, KEY_BS}, {VK_TAB, KEY_TAB}, {VK_CONTROL, KEY_CTRL},
  70
  71     // cursor keys
  72     {VK_LEFT, KEY_LEFT}, {VK_UP, KEY_UP}, {VK_RIGHT, KEY_RIGHT}, {VK_DOWN, KEY_DOWN},
  73
  74     // navigation block
  75     {VK_INSERT, KEY_INSERT}, {VK_DELETE, KEY_DELETE}, {VK_HOME, KEY_HOME}, {VK_END, KEY_END},
  76     {VK_PRIOR, KEY_PAGE_UP}, {VK_NEXT, KEY_PAGE_DOWN},
  77
  78     // F-keys
  79     {VK_F1, KEY_F+1}, {VK_F2, KEY_F+2}, {VK_F3, KEY_F+3}, {VK_F4, KEY_F+4},
  80     {VK_F5, KEY_F+5}, {VK_F6, KEY_F+6}, {VK_F7, KEY_F+7}, {VK_F8, KEY_F+8},
  81     {VK_F9, KEY_F+9}, {VK_F10, KEY_F+10}, {VK_F11, KEY_F+11}, {VK_F1, KEY_F+12},
  82     // numpad
  83     {VK_NUMPAD0, KEY_KP0}, {VK_NUMPAD1, KEY_KP1}, {VK_NUMPAD2, KEY_KP2},
  84     {VK_NUMPAD3, KEY_KP3}, {VK_NUMPAD4, KEY_KP4}, {VK_NUMPAD5, KEY_KP5},
  85     {VK_NUMPAD6, KEY_KP6}, {VK_NUMPAD7, KEY_KP7}, {VK_NUMPAD8, KEY_KP8},
  86     {VK_NUMPAD9, KEY_KP9}, {VK_DECIMAL, KEY_KPDEC},
  87
  88     {0, 0}
  89 };
  90
  91 static LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) {
  92     RECT r;
  93     POINT p;
  94     int mpkey;
  95     switch (message) {
  96         case WM_ERASEBKGND: // no need to erase background seperately
  97             return 1;
  98         case WM_PAINT:
  99             event_flags |= VO_EVENT_EXPOSE;
 100             break;
 101         case WM_MOVE:
 102             p.x = 0;
 103             p.y = 0;
 104             ClientToScreen(vo_window, &p);
 105             vo_dx = p.x;
 106             vo_dy = p.y;
 107             break;
 108         case WM_SIZE:
 109             event_flags |= VO_EVENT_RESIZE;
 110             GetClientRect(vo_window, &r);
 111             vo_dwidth = r.right;
 112             vo_dheight = r.bottom;
 113             break;
 114         case WM_WINDOWPOSCHANGING:
 115             if (vo_keepaspect && !vo_fs && WinID < 0) {
 116               WINDOWPOS *wpos = lParam;
 117               int xborder, yborder;
 118               r.left = r.top = 0;
 119               r.right = wpos->cx;
 120               r.bottom = wpos->cy;
 121               AdjustWindowRect(&r, GetWindowLong(vo_window, GWL_STYLE), 0);
 122               xborder = (r.right - r.left) - wpos->cx;
 123               yborder = (r.bottom - r.top) - wpos->cy;
 124               wpos->cx -= xborder; wpos->cy -= yborder;
 125               aspect_fit(global_vo, &wpos->cx, &wpos->cy, wpos->cx, wpos->cy);
 126               wpos->cx += xborder; wpos->cy += yborder;
 127             }
 128             return 0;
 129         case WM_CLOSE:
 130             mplayer_put_key(KEY_CLOSE_WIN);
 131             break;
 132         case WM_SYSCOMMAND:
 133             switch (wParam) {
 134                 case SC_SCREENSAVE:
 135                 case SC_MONITORPOWER:
 136                     mp_msg(MSGT_VO, MSGL_V, "vo: win32: killing screensaver\n");
 137                     return 0;
 138             }
 139             break;
 140         case WM_KEYDOWN:
 141             mpkey = lookup_keymap_table(vk_map, wParam);
 142             if (mpkey)
 143                 mplayer_put_key(mpkey);
 144             break;
 145         case WM_CHAR:
 146             mplayer_put_key(wParam);
 147             break;
 148         case WM_LBUTTONDOWN:
 149             if (!vo_nomouse_input && (vo_fs || (wParam & MK_CONTROL))) {
 150                 mplayer_put_key(MOUSE_BTN0);
 151                 break;
 152             }
 153             if (!vo_fs) {
 154                 ReleaseCapture();
 155                 SendMessage(hWnd, WM_NCLBUTTONDOWN, HTCAPTION, 0);
 156                 return 0;
 157             }
 158             break;
 159         case WM_MBUTTONDOWN:
 160             if (!vo_nomouse_input)
 161                 mplayer_put_key(MOUSE_BTN1);
 162             break;
 163         case WM_RBUTTONDOWN:
 164             if (!vo_nomouse_input)
 165                 mplayer_put_key(MOUSE_BTN2);
 166             break;
 167         case WM_MOUSEMOVE:
 168             if (enable_mouse_movements) {
 169                 char cmd_str[40];
 170                 snprintf(cmd_str, sizeof(cmd_str), "set_mouse_pos %i %i",
 171                         GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam));
 172                 mp_input_queue_cmd(global_vo->input_ctx, mp_input_parse_cmd(cmd_str));
 173             }
 174             break;
 175         case WM_MOUSEWHEEL:
 176             if (!vo_nomouse_input) {
 177                 int x = GET_WHEEL_DELTA_WPARAM(wParam);
 178                 if (x > 0)
 179                     mplayer_put_key(MOUSE_BTN3);
 180                 else
 181                     mplayer_put_key(MOUSE_BTN4);
 182                 break;
 183             }
 184     }
 185
 186     return DefWindowProc(hWnd, message, wParam, lParam);
 187 }
 188
 189 /**
 190  * \brief Dispatch incoming window events and handle them.
 191  *
 192  * This function should be placed inside libvo's function "check_events".
 193  *
 194  * Global libvo variables changed:
 195  * vo_dwidth:  new window client area width
 196  * vo_dheight: new window client area height
 197  *
 198  * \return int with these flags possibly set, take care to handle in the right order
 199  *         if it matters in your driver:
 200  *
 201  * VO_EVENT_RESIZE = The window was resized. If necessary reinit your
 202  *                   driver render context accordingly.
 203  * VO_EVENT_EXPOSE = The window was exposed. Call e.g. flip_frame() to redraw
 204  *                   the window if the movie is paused.
 205  */
 206 int vo_w32_check_events(void) {
 207     MSG msg;
 208     event_flags = 0;
 209     while (PeekMessage(&msg, 0, 0, 0, PM_REMOVE)) {
 210         TranslateMessage(&msg);
 211         DispatchMessage(&msg);
 212     }
 213     if (WinID >= 0) {
 214         RECT r;
 215         GetClientRect(vo_window, &r);
 216         if (r.right != vo_dwidth || r.bottom != vo_dheight) {
 217             vo_dwidth = r.right; vo_dheight = r.bottom;
 218             event_flags |= VO_EVENT_RESIZE;
 219         }
 220         GetClientRect(WinID, &r);
 221         if (r.right != vo_dwidth || r.bottom != vo_dheight)
 222             MoveWindow(vo_window, 0, 0, r.right, r.bottom, FALSE);
 223     }
 224
 225     return event_flags;
 226 }
 227
 228 static BOOL CALLBACK mon_enum(HMONITOR hmon, HDC hdc, LPRECT r, LPARAM p) {
 229     // this defaults to the last screen if specified number does not exist
 230     xinerama_x = r->left;
 231     xinerama_y = r->top;
 232     vo_screenwidth = r->right - r->left;
 233     vo_screenheight = r->bottom - r->top;
 234     if (mon_cnt == xinerama_screen)
 235         return FALSE;
 236     mon_cnt++;
 237     return TRUE;
 238 }
 239
 240 /**
 241  * \brief Update screen information.
 242  *
 243  * This function should be called in libvo's "control" callback
 244  * with parameter VOCTRL_UPDATE_SCREENINFO.
 245  * Note that this also enables the new API where geometry and aspect
 246  * calculations are done in video_out.c:config_video_out
 247  *
 248  * Global libvo variables changed:
 249  * xinerama_x
 250  * xinerama_y
 251  * vo_screenwidth
 252  * vo_screenheight
 253  */
 254 void w32_update_xinerama_info(void) {
 255     xinerama_x = xinerama_y = 0;
 256     if (xinerama_screen < -1) {
 257         int tmp;
 258         xinerama_x = GetSystemMetrics(SM_XVIRTUALSCREEN);
 259         xinerama_y = GetSystemMetrics(SM_YVIRTUALSCREEN);
 260         tmp = GetSystemMetrics(SM_CXVIRTUALSCREEN);
 261         if (tmp) vo_screenwidth = tmp;
 262         tmp = GetSystemMetrics(SM_CYVIRTUALSCREEN);
 263         if (tmp) vo_screenheight = tmp;
 264     } else if (xinerama_screen == -1 && myMonitorFromWindow && myGetMonitorInfo) {
 265         MONITORINFO mi;
 266         HMONITOR m = myMonitorFromWindow(vo_window, MONITOR_DEFAULTTOPRIMARY);
 267         mi.cbSize = sizeof(mi);
 268         myGetMonitorInfo(m, &mi);
 269         xinerama_x = mi.rcMonitor.left;
 270         xinerama_y = mi.rcMonitor.top;
 271         vo_screenwidth = mi.rcMonitor.right - mi.rcMonitor.left;
 272         vo_screenheight = mi.rcMonitor.bottom - mi.rcMonitor.top;
 273     } else if (xinerama_screen > 0 && myEnumDisplayMonitors) {
 274         mon_cnt = 0;
 275         myEnumDisplayMonitors(NULL, NULL, mon_enum, 0);
 276     }
 277     aspect_save_screenres(vo_screenwidth, vo_screenheight);
 278 }
 279
 280 static void updateScreenProperties(void) {
 281     DEVMODE dm;
 282     dm.dmSize = sizeof dm;
 283     dm.dmDriverExtra = 0;
 284     dm.dmFields = DM_BITSPERPEL | DM_PELSWIDTH | DM_PELSHEIGHT;
 285     if (!EnumDisplaySettings(0, ENUM_CURRENT_SETTINGS, &dm)) {
 286         mp_msg(MSGT_VO, MSGL_ERR, "vo: win32: unable to enumerate display settings!\n");
 287         return;
 288     }
 289
 290     vo_screenwidth = dm.dmPelsWidth;
 291     vo_screenheight = dm.dmPelsHeight;
 292     depthonscreen = dm.dmBitsPerPel;
 293     w32_update_xinerama_info();
 294 }
 295
 296 static void changeMode(void) {
 297     DEVMODE dm;
 298     dm.dmSize = sizeof dm;
 299     dm.dmDriverExtra = 0;
 300
 301     dm.dmFields = DM_BITSPERPEL | DM_PELSWIDTH | DM_PELSHEIGHT;
 302     dm.dmBitsPerPel = depthonscreen;
 303     dm.dmPelsWidth = vo_screenwidth;
 304     dm.dmPelsHeight = vo_screenheight;
 305
 306     if (vo_vm) {
 307         int bestMode = -1;
 308         int bestScore = INT_MAX;
 309         int i;
 310         for (i = 0; EnumDisplaySettings(0, i, &dm); ++i) {
 311             int score = (dm.dmPelsWidth - o_dwidth) * (dm.dmPelsHeight - o_dheight);
 312             if (dm.dmBitsPerPel != depthonscreen) continue;
 313             if (dm.dmPelsWidth < o_dwidth) continue;
 314             if (dm.dmPelsHeight < o_dheight) continue;
 315
 316             if (score < bestScore) {
 317                 bestScore = score;
 318                 bestMode = i;
 319             }
 320         }
 321
 322         if (bestMode != -1)
 323             EnumDisplaySettings(0, bestMode, &dm);
 324
 325     ChangeDisplaySettings(&dm, CDS_FULLSCREEN);
 326     }
 327 }
 328
 329 static void resetMode(void) {
 330     if (vo_vm)
 331     ChangeDisplaySettings(0, 0);
 332 }
 333
 334 static int createRenderingContext(void) {
 335     HWND layer = HWND_NOTOPMOST;
 336     RECT r;
 337   if (WinID < 0) {
 338     int style = (vo_border && !vo_fs) ?
 339                 (WS_OVERLAPPEDWINDOW | WS_SIZEBOX) : WS_POPUP;
 340
 341     if (vo_fs || vo_ontop) layer = HWND_TOPMOST;
 342     if (vo_fs) {
 343         changeMode();
 344         while (ShowCursor(0) >= 0) /**/ ;
 345     } else {
 346         resetMode();
 347         while (ShowCursor(1) < 0) /**/ ;
 348     }
 349     updateScreenProperties();
 350     ShowWindow(vo_window, SW_HIDE);
 351     SetWindowLong(vo_window, GWL_STYLE, style);
 352     if (vo_fs) {
 353         prev_width = vo_dwidth;
 354         prev_height = vo_dheight;
 355         prev_x = vo_dx;
 356         prev_y = vo_dy;
 357         vo_dwidth = vo_screenwidth;
 358         vo_dheight = vo_screenheight;
 359         vo_dx = xinerama_x;
 360         vo_dy = xinerama_y;
 361     } else {
 362         // make sure there are no "stale" resize events
 363         // that would set vo_d* to wrong values
 364         vo_w32_check_events();
 365         vo_dwidth = prev_width;
 366         vo_dheight = prev_height;
 367         vo_dx = prev_x;
 368         vo_dy = prev_y;
 369         // HACK around what probably is a windows focus bug:
 370         // when pressing 'f' on the console, then 'f' again to
 371         // return to windowed mode, any input into the video
 372         // window is lost forever.
 373         SetFocus(vo_window);
 374     }
 375     r.left = vo_dx;
 376     r.right = r.left + vo_dwidth;
 377     r.top = vo_dy;
 378     r.bottom = r.top + vo_dheight;
 379     AdjustWindowRect(&r, style, 0);
 380     SetWindowPos(vo_window, layer, r.left, r.top, r.right - r.left, r.bottom - r.top, SWP_SHOWWINDOW);
 381   }
 382     return 1;
 383 }
 384
 385 /**
 386  * \brief Configure and show window on the screen.
 387  *
 388  * This function should be called in libvo's "config" callback.
 389  * It configures a window and shows it on the screen.
 390  *
 391  * Global libvo variables changed:
 392  * vo_fs
 393  * vo_vm
 394  *
 395  * \return 1 - Success, 0 - Failure
 396  */
 397 int vo_w32_config(uint32_t width, uint32_t height, uint32_t flags) {
 398     // we already have a fully initialized window, so nothing needs to be done
 399     if (flags & VOFLAG_HIDDEN)
 400         return;
 401     // store original size for videomode switching
 402     o_dwidth = width;
 403     o_dheight = height;
 404
 405     if (WinID < 0) {
 406         // the desired size is ignored in wid mode, it always matches the window size.
 407         prev_width = vo_dwidth = width;
 408         prev_height = vo_dheight = height;
 409         prev_x = vo_dx;
 410         prev_y = vo_dy;
 411     }
 412
 413     vo_fs = flags & VOFLAG_FULLSCREEN;
 414     vo_vm = flags & VOFLAG_MODESWITCHING;
 415     return createRenderingContext();
 416 }
 417
 418 /**
 419  * \brief return the name of the selected device if it is indepedant
 420  */
 421 static char *get_display_name(void) {
 422     DISPLAY_DEVICE disp;
 423     disp.cb = sizeof(disp);
 424     EnumDisplayDevices(NULL, vo_adapter_num, &disp, 0);
 425     if (disp.StateFlags & DISPLAY_DEVICE_ATTACHED_TO_DESKTOP)
 426         return NULL;
 427     return disp.DeviceName;
 428 }
 429
 430 /**
 431  * \brief Initialize w32_common framework.
 432  *
 433  * The first function that should be called from the w32_common framework.
 434  * It handles window creation on the screen with proper title and attributes.
 435  * It also initializes the framework's internal variables. The function should
 436  * be called after your own preinit initialization and you shouldn't do any
 437  * window management on your own.
 438  *
 439  * Global libvo variables changed:
 440  * vo_w32_window
 441  * vo_screenwidth
 442  * vo_screenheight
 443  *
 444  * \return 1 = Success, 0 = Failure
 445  */
 446 int vo_w32_init(void) {
 447     PIXELFORMATDESCRIPTOR pfd;
 448     HDC vo_hdc;
 449     int pf;
 450     char exedir[MAX_PATH];
 451     HINSTANCE user32;
 452     HICON mplayerIcon = NULL;
 453     HICON mplayerSmallIcon = NULL;
 454     char *dev;
 455
 456     if (vo_window)
 457         return 1;
 458
 459     hInstance = GetModuleHandle(NULL);
 460
 461     mplayerIcon = (HICON)LoadImage(hInstance, MAKEINTRESOURCE(IDI_APPICON), IMAGE_ICON, 0, 0, LR_DEFAULTSIZE | LR_SHARED);
 462     mplayerSmallIcon = (HICON)LoadImage(hInstance, MAKEINTRESOURCE(IDI_APPICON), IMAGE_ICON, 16, 16, LR_SHARED);
 463
 464   {
 465     WNDCLASSEX wcex = { sizeof wcex, CS_OWNDC | CS_DBLCLKS, WndProc, 0, 0, hInstance, mplayerIcon, LoadCursor(0, IDC_ARROW), NULL, 0, classname, mplayerSmallIcon };
 466
 467     if (!RegisterClassEx(&wcex)) {
 468         mp_msg(MSGT_VO, MSGL_ERR, "vo: win32: unable to register window class!\n");
 469         return 0;
 470     }
 471   }
 472
 473     if (WinID >= 0)
 474     {
 475         RECT r;
 476         GetClientRect(WinID, &r);
 477         vo_dwidth = r.right; vo_dheight = r.bottom;
 478         vo_window = CreateWindowEx(WS_EX_NOPARENTNOTIFY, classname, classname,
 479                      WS_CHILD | WS_VISIBLE,
 480                      0, 0, vo_dwidth, vo_dheight, WinID, 0, hInstance, 0);
 481         EnableWindow(vo_window, 0);
 482     } else
 483     vo_window = CreateWindowEx(0, classname, classname,
 484                   vo_border ? (WS_OVERLAPPEDWINDOW | WS_SIZEBOX) : WS_POPUP,
 485                   CW_USEDEFAULT, 0, 100, 100, 0, 0, hInstance, 0);
 486     if (!vo_window) {
 487         mp_msg(MSGT_VO, MSGL_ERR, "vo: win32: unable to create window!\n");
 488         return 0;
 489     }
 490
 491     myMonitorFromWindow = NULL;
 492     myGetMonitorInfo = NULL;
 493     myEnumDisplayMonitors = NULL;
 494     user32 = GetModuleHandle("user32.dll");
 495     if (user32) {
 496         myMonitorFromWindow = (void *)GetProcAddress(user32, "MonitorFromWindow");
 497         myGetMonitorInfo = GetProcAddress(user32, "GetMonitorInfoA");
 498         myEnumDisplayMonitors = GetProcAddress(user32, "EnumDisplayMonitors");
 499     }
 500     dev_hdc = 0;
 501     dev = get_display_name();
 502     if (dev) dev_hdc = CreateDC(dev, NULL, NULL, NULL);
 503     updateScreenProperties();
 504
 505     vo_hdc = vo_w32_get_dc(vo_window);
 506     memset(&pfd, 0, sizeof pfd);
 507     pfd.nSize = sizeof pfd;
 508     pfd.nVersion = 1;
 509     pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
 510     pfd.iPixelType = PFD_TYPE_RGBA;
 511     pfd.cColorBits = 24;
 512     pfd.iLayerType = PFD_MAIN_PLANE;
 513     pf = ChoosePixelFormat(vo_hdc, &pfd);
 514     if (!pf) {
 515             mp_msg(MSGT_VO, MSGL_ERR, "vo: win32: unable to select a valid pixel format!\n");
 516         vo_w32_release_dc(vo_window, vo_hdc);
 517         return 0;
 518     }
 519
 520     SetPixelFormat(vo_hdc, pf, &pfd);
 521     vo_w32_release_dc(vo_window, vo_hdc);
 522
 523     mp_msg(MSGT_VO, MSGL_V, "vo: win32: running at %dx%d with depth %d\n", vo_screenwidth, vo_screenheight, depthonscreen);
 524
 525     return 1;
 526 }
 527
 528 /**
 529  * \brief Toogle fullscreen / windowed mode.
 530  *
 531  * Should be called on VOCTRL_FULLSCREEN event. The window is
 532  * always resized after this call, so the rendering context
 533  * should be reinitialized with the new dimensions.
 534  * It is unspecified if vo_check_events will create a resize
 535  * event in addition or not.
 536  *
 537  * Global libvo variables changed:
 538  * vo_dwidth
 539  * vo_dheight
 540  * vo_fs
 541  */
 542
 543 void vo_w32_fullscreen(void) {
 544     vo_fs = !vo_fs;
 545
 546     createRenderingContext();
 547 }
 548
 549 /**
 550  * \brief Toogle window border attribute.
 551  *
 552  * Should be called on VOCTRL_BORDER event.
 553  *
 554  * Global libvo variables changed:
 555  * vo_border
 556  */
 557 void vo_w32_border(void) {
 558     vo_border = !vo_border;
 559     createRenderingContext();
 560 }
 561
 562 /**
 563  * \brief Toogle window ontop attribute.
 564  *
 565  * Should be called on VOCTRL_ONTOP event.
 566  *
 567  * Global libvo variables changed:
 568  * vo_ontop
 569  */
 570 void vo_w32_ontop( void )
 571 {
 572     vo_ontop = !vo_ontop;
 573     if (!vo_fs) {
 574         createRenderingContext();
 575     }
 576 }
 577
 578 /**
 579  * \brief Uninitialize w32_common framework.
 580  *
 581  * Should be called last in video driver's uninit function. First release
 582  * anything built on top of the created window e.g. rendering context inside
 583  * and call vo_w32_uninit at the end.
 584  */
 585 void vo_w32_uninit(void) {
 586     mp_msg(MSGT_VO, MSGL_V, "vo: win32: uninit\n");
 587     resetMode();
 588     ShowCursor(1);
 589     depthonscreen = 0;
 590     if (dev_hdc) DeleteDC(dev_hdc);
 591     dev_hdc = 0;
 592     DestroyWindow(vo_window);
 593     vo_window = 0;
 594     UnregisterClass(classname, 0);
 595 }
 596
 597 /**
 598  * \brief get a device context to draw in
 599  *
 600  * \param wnd window the DC should belong to if it makes sense
 601  */
 602 HDC vo_w32_get_dc(HWND wnd) {
 603     if (dev_hdc) return dev_hdc;
 604     return GetDC(wnd);
 605 }
 606
 607 /**
 608  * \brief release a device context
 609  *
 610  * \param wnd window the DC probably belongs to
 611  */
 612 void vo_w32_release_dc(HWND wnd, HDC dc) {
 613     if (dev_hdc) return;
 614     ReleaseDC(wnd, dc);
 615 }