Thanks Tim, all of that makes a lot of sense. I created a region from a series of points, used the region, and everything works perfectly. I'm interested to know if you know of a better way to do what I'm doing though, since you are obviously quite knowledgeable :)
I have an application with a graphical background and rounded corners. The rounding requires that a certain very small portion of the rectangular window area be fully transparent and/or not there at all. My first attempt was with SetLayeredWindowAttributes using LWA_COLORKEY. This was very simple to implement, and worked perfectly - but it was slow. On non hardware accelerated heads, the application was very sluggish being dragged around. My next attempt was with UpdateLayeredWindow, but I had a pretty rough time finding information on that, so I struck upon window regions - after all, I was not looking for alpha blending, just 'there' and 'not there' on a few pixels. Now I hear from you that window regions may not be so efficient :) I have calculated that the window region requires 7 different rectangles, all tiny except for one big one in the middle. My (simple) testing shows it is faster than SetLayeredWindowAttributes. Now, do you think I have found a good solution, or is there a better way? I understand that having common controls on a window and using UpdateLayeredWindow can be tricky. I'm interested to know what you think. Thanks for taking the time to respond, it was very much appreciated :) On Jan 14, 2008 4:26 PM, Tim Roberts <[EMAIL PROTECTED]> wrote: > Henry Baxter wrote: > > > > I'm having some trouble working with window 'regions'. I need to > > initialize some memory for the region and work with it. > > > > I have copied my best approach so far, but I know I don't know what > > I'm doing when it comes to the 'Buffer' field in RGNDATA. MSDN > > describes what HRGN points to (a RGNDATA struct) as: > > I don't believe that an HRGN literally points to an RGNDATA struct. The > RGNDATA is certainly behind an HRGN, but there's a mapping in there. > You should use GetRgnData and ExtCreateRegion to convert between them. > > > > How do I create an arbitrary-size buffer and initialize it? That > > doesn't really make a lot of sense to me. > > In general, the best plan is to leave the RGNDATA management to GDI. > You should build your region a bit at a time from the simpler structures > and merge them into your region. So, use CreateRectRgn to create the > basic frame, and then add to it with CombineRgn and friends. > > Also, you should remember that working with region in Windows can be > rather inefficient. A drawing operation that is clipped by a region > gets sent to the driver multiple times, once for each unique rectangle > in the region. > > -- > Tim Roberts, [EMAIL PROTECTED] > Providenza & Boekelheide, Inc. > > _______________________________________________ > python-win32 mailing list > python-win32@python.org > http://mail.python.org/mailman/listinfo/python-win32 > -- Henry
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