Blitting to multiple windows

I believe the primary buffer is actually the entire screen. So one primary buffer will allow you to blit wherever you want on the entire desktop.

---

Steve ''Sly'' Williams
Tools Developer
Krome Studios

You only create 1 primary buffer. This covers the _entire_ screen. Not just your window. You can force Blits to be inside the current window by using the IDirectDrawClipper::SetHWnd() method.

---

Please state the nature of the debugging emergency.

sharewaregames.20m.com

Ok, that wasn''t really what I asked for. I know how to blit to multiple windows. It''s just that the docs recommend you to only set the clipper to the window handle you want to blit to instead of creating a primary surface for each window.

Now the only reason I can think of why you should use the clipper method is that the it''s a lot easier and keeps your code a bit cleaner. Otherwise if you have four windows, you''d have to create four primary surfaces.

Well, it''s not really an important question. I was just wondering why they (the DirectX docs) recommend the method with the clippers.

Because the first primary surface that you create IS the entire screen. That is why you should only create one primary surface. Using multiple primary surfaces on what is actually the same surface may cause locking, lost surfaces and other not-so-nice things.

---

Steve ''Sly'' Williams
Tools Developer
Krome Studios

Ok, thanks. That was what I needed to know.