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