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 "input/input.h"
  28 #include "input/mouse.h"
  29 #include "mp_msg.h"
  30 #include "video_out.h"
  31 #include "aspect.h"
  32 #include "w32_common.h"
  33 #include "mp_fifo.h"
  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 static int depthonscreen;
  43 // last non-fullscreen extends
  44 static int prev_width;
  45 static int prev_height;
  46 static int prev_x;
  47 static int prev_y;
  48
  49 static uint32_t o_dwidth;
  50 static uint32_t o_dheight;
  51
  52 static HINSTANCE hInstance;
  53 #define vo_window vo_w32_window
  54 HWND vo_window = 0;
  55 /** HDC used when rendering to a device instead of window */
  56 static HDC dev_hdc;
  57 static int event_flags;
  58 static int mon_cnt;
  59
  60 static HMONITOR (WINAPI* myMonitorFromWindow)(HWND, DWORD);
  61 static BOOL (WINAPI* myGetMonitorInfo)(HMONITOR, LPMONITORINFO);
  62 static BOOL (WINAPI* myEnumDisplayMonitors)(HDC, LPCRECT, MONITORENUMPROC, LPARAM);
  63
  64 static const struct mp_keymap vk_map[] = {
  65     // special keys
  66     {VK_ESCAPE, KEY_ESC}, {VK_BACK, KEY_BS}, {VK_TAB, KEY_TAB}, {VK_CONTROL, KEY_CTRL},
  67
  68     // cursor keys
  69     {VK_LEFT, KEY_LEFT}, {VK_UP, KEY_UP}, {VK_RIGHT, KEY_RIGHT}, {VK_DOWN, KEY_DOWN},
  70
  71     // navigation block
  72     {VK_INSERT, KEY_INSERT}, {VK_DELETE, KEY_DELETE}, {VK_HOME, KEY_HOME}, {VK_END, KEY_END},
  73     {VK_PRIOR, KEY_PAGE_UP}, {VK_NEXT, KEY_PAGE_DOWN},
  74
  75     // F-keys
  76     {VK_F1, KEY_F+1}, {VK_F2, KEY_F+2}, {VK_F3, KEY_F+3}, {VK_F4, KEY_F+4},
  77     {VK_F5, KEY_F+5}, {VK_F6, KEY_F+6}, {VK_F7, KEY_F+7}, {VK_F8, KEY_F+8},
  78     {VK_F9, KEY_F+9}, {VK_F10, KEY_F+10}, {VK_F11, KEY_F+11}, {VK_F1, KEY_F+12},
  79     // numpad
  80     {VK_NUMPAD0, KEY_KP0}, {VK_NUMPAD1, KEY_KP1}, {VK_NUMPAD2, KEY_KP2},
  81     {VK_NUMPAD3, KEY_KP3}, {VK_NUMPAD4, KEY_KP4}, {VK_NUMPAD5, KEY_KP5},
  82     {VK_NUMPAD6, KEY_KP6}, {VK_NUMPAD7, KEY_KP7}, {VK_NUMPAD8, KEY_KP8},
  83     {VK_NUMPAD9, KEY_KP9}, {VK_DECIMAL, KEY_KPDEC},
  84
  85     {0, 0}
  86 };
  87
  88 static LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) {
  89     RECT r;
  90     POINT p;
  91     int mpkey;
  92     switch (message) {
  93         case WM_ERASEBKGND: // no need to erase background seperately
  94             return 1;
  95         case WM_PAINT:
  96             event_flags |= VO_EVENT_EXPOSE;
  97             break;
  98         case WM_MOVE:
  99             p.x = 0;
 100             p.y = 0;
 101             ClientToScreen(vo_window, &p);
 102             vo_dx = p.x;
 103             vo_dy = p.y;
 104             break;
 105         case WM_SIZE:
 106             event_flags |= VO_EVENT_RESIZE;
 107             GetClientRect(vo_window, &r);
 108             vo_dwidth = r.right;
 109             vo_dheight = r.bottom;
 110             break;
 111         case WM_WINDOWPOSCHANGING:
 112             if (vo_keepaspect && !vo_fs && WinID < 0) {
 113                 WINDOWPOS *wpos = lParam;
 114                 int xborder, yborder;
 115                 r.left = r.top = 0;
 116                 r.right = wpos->cx;
 117                 r.bottom = wpos->cy;
 118                 AdjustWindowRect(&r, GetWindowLong(vo_window, GWL_STYLE), 0);
 119                 xborder = (r.right - r.left) - wpos->cx;
 120                 yborder = (r.bottom - r.top) - wpos->cy;
 121                 wpos->cx -= xborder; wpos->cy -= yborder;
 122                 aspect_fit(global_vo, &wpos->cx, &wpos->cy, wpos->cx, wpos->cy);
 123                 wpos->cx += xborder; wpos->cy += yborder;
 124             }
 125             return 0;
 126         case WM_CLOSE:
 127             mplayer_put_key(KEY_CLOSE_WIN);
 128             break;
 129         case WM_SYSCOMMAND:
 130             switch (wParam) {
 131                 case SC_SCREENSAVE:
 132                 case SC_MONITORPOWER:
 133                     mp_msg(MSGT_VO, MSGL_V, "vo: win32: killing screensaver\n");
 134                     return 0;
 135             }
 136             break;
 137         case WM_KEYDOWN:
 138             mpkey = lookup_keymap_table(vk_map, wParam);
 139             if (mpkey)
 140                 mplayer_put_key(mpkey);
 141             break;
 142         case WM_CHAR:
 143             mplayer_put_key(wParam);
 144             break;
 145         case WM_LBUTTONDOWN:
 146             if (!vo_nomouse_input && (vo_fs || (wParam & MK_CONTROL))) {
 147                 mplayer_put_key(MOUSE_BTN0);
 148                 break;
 149             }
 150             if (!vo_fs) {
 151                 ReleaseCapture();
 152                 SendMessage(hWnd, WM_NCLBUTTONDOWN, HTCAPTION, 0);
 153                 return 0;
 154             }
 155             break;
 156         case WM_MBUTTONDOWN:
 157             if (!vo_nomouse_input)
 158                 mplayer_put_key(MOUSE_BTN1);
 159             break;
 160         case WM_RBUTTONDOWN:
 161             if (!vo_nomouse_input)
 162                 mplayer_put_key(MOUSE_BTN2);
 163             break;
 164         case WM_MOUSEMOVE:
 165             vo_mouse_movement(global_vo, GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam));
 166             break;
 167         case WM_MOUSEWHEEL:
 168             if (!vo_nomouse_input) {
 169                 int x = GET_WHEEL_DELTA_WPARAM(wParam);
 170                 if (x > 0)
 171                     mplayer_put_key(MOUSE_BTN3);
 172                 else
 173                     mplayer_put_key(MOUSE_BTN4);
 174                 break;
 175             }
 176     }
 177
 178     return DefWindowProc(hWnd, message, wParam, lParam);
 179 }
 180
 181 /**
 182  * \brief Dispatch incoming window events and handle them.
 183  *
 184  * This function should be placed inside libvo's function "check_events".
 185  *
 186  * Global libvo variables changed:
 187  * vo_dwidth:  new window client area width
 188  * vo_dheight: new window client area height
 189  *
 190  * \return int with these flags possibly set, take care to handle in the right order
 191  *         if it matters in your driver:
 192  *
 193  * VO_EVENT_RESIZE = The window was resized. If necessary reinit your
 194  *                   driver render context accordingly.
 195  * VO_EVENT_EXPOSE = The window was exposed. Call e.g. flip_frame() to redraw
 196  *                   the window if the movie is paused.
 197  */
 198 int vo_w32_check_events(void) {
 199     MSG msg;
 200     event_flags = 0;
 201     while (PeekMessage(&msg, 0, 0, 0, PM_REMOVE)) {
 202         TranslateMessage(&msg);
 203         DispatchMessage(&msg);
 204     }
 205     if (WinID >= 0) {
 206         BOOL res;
 207         RECT r;
 208         res = GetClientRect(vo_window, &r);
 209         if (res && (r.right != vo_dwidth || r.bottom != vo_dheight)) {
 210             vo_dwidth = r.right; vo_dheight = r.bottom;
 211             event_flags |= VO_EVENT_RESIZE;
 212         }
 213         res = GetClientRect(WinID, &r);
 214         if (res && (r.right != vo_dwidth || r.bottom != vo_dheight))
 215             MoveWindow(vo_window, 0, 0, r.right, r.bottom, FALSE);
 216         if (!IsWindow(WinID))
 217             // Window has probably been closed, e.g. due to program crash
 218             mplayer_put_key(KEY_CLOSE_WIN);
 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     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 = 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 != 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     RECT r;
 333     int style = (vo_border && !vo_fs) ?
 334                 (WS_OVERLAPPEDWINDOW | WS_SIZEBOX) : WS_POPUP;
 335
 336     if (WinID >= 0)
 337         return 1;
 338
 339     if (vo_fs || vo_ontop) layer = HWND_TOPMOST;
 340     if (vo_fs) {
 341         changeMode();
 342         while (ShowCursor(0) >= 0) /**/ ;
 343     } else {
 344         resetMode();
 345         while (ShowCursor(1) < 0) /**/ ;
 346     }
 347     updateScreenProperties();
 348     ShowWindow(vo_window, SW_HIDE);
 349     SetWindowLong(vo_window, GWL_STYLE, style);
 350     if (vo_fs) {
 351         prev_width = vo_dwidth;
 352         prev_height = vo_dheight;
 353         prev_x = vo_dx;
 354         prev_y = vo_dy;
 355         vo_dwidth = vo_screenwidth;
 356         vo_dheight = vo_screenheight;
 357         vo_dx = xinerama_x;
 358         vo_dy = xinerama_y;
 359     } else {
 360         // make sure there are no "stale" resize events
 361         // that would set vo_d* to wrong values
 362         vo_w32_check_events();
 363         vo_dwidth = prev_width;
 364         vo_dheight = prev_height;
 365         vo_dx = prev_x;
 366         vo_dy = prev_y;
 367         // HACK around what probably is a windows focus bug:
 368         // when pressing 'f' on the console, then 'f' again to
 369         // return to windowed mode, any input into the video
 370         // window is lost forever.
 371         SetFocus(vo_window);
 372     }
 373     r.left = vo_dx;
 374     r.right = r.left + vo_dwidth;
 375     r.top = vo_dy;
 376     r.bottom = r.top + vo_dheight;
 377     AdjustWindowRect(&r, style, 0);
 378     SetWindowPos(vo_window, layer, r.left, r.top, r.right - r.left, r.bottom - r.top, SWP_SHOWWINDOW);
 379     return 1;
 380 }
 381
 382 /**
 383  * \brief Configure and show window on the screen.
 384  *
 385  * This function should be called in libvo's "config" callback.
 386  * It configures a window and shows it on the screen.
 387  *
 388  * Global libvo variables changed:
 389  * vo_fs
 390  * vo_vm
 391  *
 392  * \return 1 - Success, 0 - Failure
 393  */
 394 int vo_w32_config(uint32_t width, uint32_t height, uint32_t flags) {
 395     PIXELFORMATDESCRIPTOR pfd;
 396     int pf;
 397     HDC vo_hdc = vo_w32_get_dc(vo_window);
 398
 399     memset(&pfd, 0, sizeof pfd);
 400     pfd.nSize = sizeof pfd;
 401     pfd.nVersion = 1;
 402     pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
 403     if (flags & VOFLAG_STEREO)
 404         pfd.dwFlags |= PFD_STEREO;
 405     pfd.iPixelType = PFD_TYPE_RGBA;
 406     pfd.cColorBits = 24;
 407     pfd.iLayerType = PFD_MAIN_PLANE;
 408     pf = ChoosePixelFormat(vo_hdc, &pfd);
 409     if (!pf) {
 410         mp_msg(MSGT_VO, MSGL_ERR, "vo: win32: unable to select a valid pixel format!\n");
 411         vo_w32_release_dc(vo_window, vo_hdc);
 412         return 0;
 413     }
 414
 415     SetPixelFormat(vo_hdc, pf, &pfd);
 416     vo_w32_release_dc(vo_window, vo_hdc);
 417
 418     // we already have a fully initialized window, so nothing needs to be done
 419     if (flags & VOFLAG_HIDDEN)
 420         return 1;
 421     // store original size for videomode switching
 422     o_dwidth = width;
 423     o_dheight = height;
 424
 425     if (WinID < 0) {
 426         // the desired size is ignored in wid mode, it always matches the window size.
 427         prev_width = vo_dwidth = width;
 428         prev_height = vo_dheight = height;
 429         prev_x = vo_dx;
 430         prev_y = vo_dy;
 431     }
 432
 433     vo_fs = flags & VOFLAG_FULLSCREEN;
 434     vo_vm = flags & VOFLAG_MODESWITCHING;
 435     return createRenderingContext();
 436 }
 437
 438 /**
 439  * \brief return the name of the selected device if it is indepedant
 440  * \return pointer to string, must be freed.
 441  */
 442 static char *get_display_name(void) {
 443     DISPLAY_DEVICE disp;
 444     disp.cb = sizeof(disp);
 445     EnumDisplayDevices(NULL, vo_adapter_num, &disp, 0);
 446     if (disp.StateFlags & DISPLAY_DEVICE_ATTACHED_TO_DESKTOP)
 447         return NULL;
 448     return strdup(disp.DeviceName);
 449 }
 450
 451 /**
 452  * \brief Initialize w32_common framework.
 453  *
 454  * The first function that should be called from the w32_common framework.
 455  * It handles window creation on the screen with proper title and attributes.
 456  * It also initializes the framework's internal variables. The function should
 457  * be called after your own preinit initialization and you shouldn't do any
 458  * window management on your own.
 459  *
 460  * Global libvo variables changed:
 461  * vo_w32_window
 462  * vo_screenwidth
 463  * vo_screenheight
 464  *
 465  * \return 1 = Success, 0 = Failure
 466  */
 467 int vo_w32_init(void) {
 468     HICON mplayerIcon = 0;
 469     char exedir[MAX_PATH];
 470     HINSTANCE user32;
 471     char *dev;
 472
 473     if (vo_window)
 474         return 1;
 475
 476     hInstance = GetModuleHandle(0);
 477
 478     if (GetModuleFileName(0, exedir, MAX_PATH))
 479         mplayerIcon = ExtractIcon(hInstance, exedir, 0);
 480     if (!mplayerIcon)
 481         mplayerIcon = LoadIcon(0, IDI_APPLICATION);
 482
 483   {
 484     WNDCLASSEX wcex = { sizeof wcex, CS_OWNDC | CS_DBLCLKS, WndProc, 0, 0, hInstance, mplayerIcon, LoadCursor(0, IDC_ARROW), NULL, 0, classname, mplayerIcon };
 485
 486     if (!RegisterClassEx(&wcex)) {
 487         mp_msg(MSGT_VO, MSGL_ERR, "vo: win32: unable to register window class!\n");
 488         return 0;
 489     }
 490   }
 491
 492     if (WinID >= 0)
 493     {
 494         RECT r;
 495         GetClientRect(WinID, &r);
 496         vo_dwidth = r.right; vo_dheight = r.bottom;
 497         vo_window = CreateWindowEx(WS_EX_NOPARENTNOTIFY, classname, classname,
 498                      WS_CHILD | WS_VISIBLE,
 499                      0, 0, vo_dwidth, vo_dheight, WinID, 0, hInstance, 0);
 500         EnableWindow(vo_window, 0);
 501     } else
 502         vo_window = CreateWindowEx(0, classname, classname,
 503                       vo_border ? (WS_OVERLAPPEDWINDOW | WS_SIZEBOX) : WS_POPUP,
 504                       CW_USEDEFAULT, 0, 100, 100, 0, 0, hInstance, 0);
 505     if (!vo_window) {
 506         mp_msg(MSGT_VO, MSGL_ERR, "vo: win32: unable to create window!\n");
 507         return 0;
 508     }
 509
 510     myMonitorFromWindow = NULL;
 511     myGetMonitorInfo = NULL;
 512     myEnumDisplayMonitors = NULL;
 513     user32 = GetModuleHandle("user32.dll");
 514     if (user32) {
 515         myMonitorFromWindow = (void *)GetProcAddress(user32, "MonitorFromWindow");
 516         myGetMonitorInfo = GetProcAddress(user32, "GetMonitorInfoA");
 517         myEnumDisplayMonitors = GetProcAddress(user32, "EnumDisplayMonitors");
 518     }
 519     dev_hdc = 0;
 520     dev = get_display_name();
 521     if (dev) dev_hdc = CreateDC(dev, NULL, NULL, NULL);
 522     free(dev);
 523     updateScreenProperties();
 524
 525     mp_msg(MSGT_VO, MSGL_V, "vo: win32: running at %dx%d with depth %d\n", vo_screenwidth, vo_screenheight, depthonscreen);
 526
 527     return 1;
 528 }
 529
 530 /**
 531  * \brief Toogle fullscreen / windowed mode.
 532  *
 533  * Should be called on VOCTRL_FULLSCREEN event. The window is
 534  * always resized after this call, so the rendering context
 535  * should be reinitialized with the new dimensions.
 536  * It is unspecified if vo_check_events will create a resize
 537  * event in addition or not.
 538  *
 539  * Global libvo variables changed:
 540  * vo_dwidth
 541  * vo_dheight
 542  * vo_fs
 543  */
 544
 545 void vo_w32_fullscreen(void) {
 546     vo_fs = !vo_fs;
 547
 548     createRenderingContext();
 549 }
 550
 551 /**
 552  * \brief Toogle window border attribute.
 553  *
 554  * Should be called on VOCTRL_BORDER event.
 555  *
 556  * Global libvo variables changed:
 557  * vo_border
 558  */
 559 void vo_w32_border(void) {
 560     vo_border = !vo_border;
 561     createRenderingContext();
 562 }
 563
 564 /**
 565  * \brief Toogle window ontop attribute.
 566  *
 567  * Should be called on VOCTRL_ONTOP event.
 568  *
 569  * Global libvo variables changed:
 570  * vo_ontop
 571  */
 572 void vo_w32_ontop( void )
 573 {
 574     vo_ontop = !vo_ontop;
 575     if (!vo_fs) {
 576         createRenderingContext();
 577     }
 578 }
 579
 580 /**
 581  * \brief Uninitialize w32_common framework.
 582  *
 583  * Should be called last in video driver's uninit function. First release
 584  * anything built on top of the created window e.g. rendering context inside
 585  * and call vo_w32_uninit at the end.
 586  */
 587 void vo_w32_uninit(void) {
 588     mp_msg(MSGT_VO, MSGL_V, "vo: win32: uninit\n");
 589     resetMode();
 590     ShowCursor(1);
 591     depthonscreen = 0;
 592     if (dev_hdc) DeleteDC(dev_hdc);
 593     dev_hdc = 0;
 594     DestroyWindow(vo_window);
 595     vo_window = 0;
 596     UnregisterClass(classname, 0);
 597 }
 598
 599 /**
 600  * \brief get a device context to draw in
 601  *
 602  * \param wnd window the DC should belong to if it makes sense
 603  */
 604 HDC vo_w32_get_dc(HWND wnd) {
 605     if (dev_hdc) return dev_hdc;
 606     return GetDC(wnd);
 607 }
 608
 609 /**
 610  * \brief release a device context
 611  *
 612  * \param wnd window the DC probably belongs to
 613  */
 614 void vo_w32_release_dc(HWND wnd, HDC dc) {
 615     if (dev_hdc) return;
 616     ReleaseDC(wnd, dc);
 617 }