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716 lvd 1 
#include "std.h"
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#include "emul.h"
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#include "vars.h"
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#include "dx.h"
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#include "dxovr.h"
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#include "dxerr.h"
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#include "init.h"
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DWORD colorkey=-1;
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void update_overlay()
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{
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   RECT rc_src, rc_dst;
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   GetClientRect(wnd, &rc_dst);
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   ClientToScreen(wnd, (POINT*)&rc_dst.left);
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   ClientToScreen(wnd, (POINT*)&rc_dst.right);
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   if (rc_dst.left == rc_dst.right || rc_dst.top == rc_dst.bottom) return;
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   rc_src.left = rc_src.top = 0;
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   rc_src.right = temp.ox, rc_src.bottom = temp.oy;
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   if (wnd == GetForegroundWindow() && rc_dst.left >= 0 && rc_dst.top >= 0)
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   {
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      DDSURFACEDESC desc; desc.dwSize = sizeof desc;
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      if (sprim->IsLost() == DDERR_SURFACELOST)
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          sprim->Restore();
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      HRESULT r = sprim->Lock(0, &desc, DDLOCK_SURFACEMEMORYPTR | DDLOCK_WAIT | DDLOCK_READONLY, 0);
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      if (r != DD_OK) { printrdd("IDirectDrawSurface2::Lock() [test]", r); exit(); }
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      char *ptr = (char*)desc.lpSurface + rc_dst.top*desc.lPitch + rc_dst.left*desc.ddpfPixelFormat.dwRGBBitCount/8;
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      colorkey = *(unsigned*)ptr;
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      sprim->Unlock(0);
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      if (desc.ddpfPixelFormat.dwRGBBitCount < 32)
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         colorkey &= (1<<desc.ddpfPixelFormat.dwRGBBitCount)-1;
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   }
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   // use min and max stretch
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   DDCAPS caps; caps.dwSize = sizeof caps; dd->GetCaps(&caps,0);
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   if ((rc_dst.right - rc_dst.left)*1000/temp.ox > (int)caps.dwMaxOverlayStretch)
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      rc_dst.right = rc_dst.left + temp.ox*caps.dwMaxOverlayStretch/1000;
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   if ((rc_dst.bottom - rc_dst.top)*1000/temp.oy > (int)caps.dwMaxOverlayStretch)
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      rc_dst.bottom = rc_dst.top + temp.oy*caps.dwMaxOverlayStretch/1000;
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   if ((rc_dst.right - rc_dst.left)*1000/temp.ox < (int)caps.dwMinOverlayStretch)
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      rc_dst.right = rc_dst.left + temp.ox*caps.dwMinOverlayStretch/1000;
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   if ((rc_dst.bottom - rc_dst.top)*1000/temp.oy < (int)caps.dwMinOverlayStretch)
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      rc_dst.bottom = rc_dst.top + temp.oy*caps.dwMinOverlayStretch/1000;
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   // setup boundaries for non-clipping overlay
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   int mx = GetSystemMetrics(SM_CXSCREEN), my = GetSystemMetrics(SM_CYSCREEN);
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   if (rc_dst.left < 0) rc_src.left = -rc_dst.left * (rc_src.right - rc_src.left) / (rc_dst.right - rc_dst.left), rc_dst.left = 0;
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   if (rc_dst.top < 0) rc_src.top = -rc_dst.top * (rc_src.bottom - rc_src.top) / (rc_dst.bottom - rc_dst.top), rc_dst.top = 0;
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   if (rc_dst.right > mx) rc_src.right = rc_src.left + (mx - rc_dst.left) * (rc_src.right - rc_src.left) / (rc_dst.right - rc_dst.left), rc_dst.right = mx;
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   if (rc_dst.bottom > my) rc_src.bottom = (my - rc_dst.top) * (rc_src.bottom - rc_src.top) / (rc_dst.bottom - rc_dst.top), rc_dst.bottom = my;
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   if (colorkey==-1) return;
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   if (rc_dst.left >= rc_dst.right || rc_dst.top >= rc_dst.bottom) return;
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   if (rc_src.left >= rc_src.right || rc_src.top >= rc_src.bottom) return;
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   DDOVERLAYFX fx = { sizeof fx };
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   fx.dckDestColorkey.dwColorSpaceLowValue = fx.dckDestColorkey.dwColorSpaceHighValue = colorkey;
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   for (;;) {
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      HRESULT r = surf0->UpdateOverlay(&rc_src, sprim, &rc_dst, DDOVER_SHOW | DDOVER_DDFX | DDOVER_KEYDESTOVERRIDE, &fx);
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      if (r == DD_OK) break;
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      if (r == DDERR_SURFACELOST) {
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         if (surf0->Restore() != DD_OK) set_vidmode(); // recreate overlay
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         break; // another update_overlay in set_vidmode() -> UpdateWindow()
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      }
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      printrdd("IDirectDrawSurface2::UpdateOverlay()", r); exit();
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   }
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}