Stretching an Image

[The feature associated with this page, MCIWnd Window Class, is a legacy feature. It has been superseded by MediaPlayer. MediaPlayer has been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer instead of MCIWnd Window Class, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

The following example stretches the images of a video clip. It increases the dimensions of the destination rectangle by using the MCIWndPutDest macro. The size of the playback area remains unchanged, so the result is a distorted, magnified image. The examples uses the MCIWndPutDest function to reposition the destination rectangle with respect to the playback area, providing a way to view different portions of the stretched image.

extern RECT rCurrent, rDest; 
 
case WM_COMMAND: 
   switch (wParam) 
   { 
       case IDM_CREATEMCIWND: 
           g_hwndMCIWnd = MCIWndCreate(hwnd, 
               g_hinst, 
               WS_CHILD | WS_VISIBLE, 
               "sample.avi"); 
           break; 
 
       case  IDM_STRETCHIMAGE:      // stretch destination RECT 3:2, 
           MCIWndGetDest(g_hwndMCIWnd, &rCurrent); // destination RECT 
           rDest.top = rCurrent.top;               // new boundaries 
           rDest.right = rCurrent.right; 
           rDest.left = rCurrent.left + 
               ((rCurrent.left - rCurrent.right) * 3); 
           rDest.bottom = rCurrent.top + 
               ((rCurrent.bottom - rCurrent.top) * 2); 
           MCIWndPutDest(g_hwndMCIWnd, &rDest); // new destination 
           break; 
       case IDM_MOVEDOWN:           // move toward bottom of image 
           MCIWndGetDest(g_hwndMCIWnd, &rCurrent); // destination RECT 
           rCurrent.top -= 100;                    // new boundaries 
           rCurrent.bottom -= 100; 
           MCIWndPutDest(g_hwndMCIWnd, &rCurrent); // new destination
           break; 
       case IDM_MOVEUP:             // move toward top of image 
           MCIWndGetDest(g_hwndMCIWnd, &rCurrent); // destination RECT 
           rCurrent.top += 100;                    // new boundaries 
           rCurrent.bottom += 100; 
           MCIWndPutDest(g_hwndMCIWnd, &rCurrent); // new destination 
           break; 
       case IDM_MOVELEFT:           // move toward left edge of image
           MCIWndGetDest(g_hwndMCIWnd, &rCurrent); // destination RECT 
           rCurrent.right += 100;                  // new boundaries 
           rCurrent.left += 100; 
           MCIWndPutDest(g_hwndMCIWnd, &rCurrent); // new destination 
           break; 
       case  IDM_MOVERIGHT:         // move toward right edge of image
           MCIWndGetDest(g_hwndMCIWnd, &rCurrent); // destination RECT
           rCurrent.right -= 100;                  // new boundaries 
           rCurrent.left -= 100; 
           MCIWndPutDest(g_hwndMCIWnd, &rCurrent); // new destination 
           break; 
   } 
   break; 
 
   // Handle other messages here.