How to do alphablend on Transperent window?

Question

I was trying to do alphablend on a transperenet window. It worked too. But the problem is -
I am doing alphablend on volume bar image in my application. for volume 0 it worked perfect.
and then when I incerase the volume previous image should be removed and new image should be pasted.
But it is pasting image on the old image and not removing the previous image. Because of this after increasing
the volume till full all the alphablend effects are vanished.
 
My program works fine if the window is not a transperent window. But for transperent window i cant remove previous image i.e. InvalidateRect is not working in transperent window.

And one related question is alphablend is not working if the background is a movie. it works perfect if background is picture. Can u solve this prob too i.e. alphablending on video???

Answer 1

mmm, are you sure this is a Windows GDI/DirectX forum?

---

---

The following is signature, not part of post
Please mark the post answered your question as the answer, and mark other helpful posts as helpful.
Visual C++ MVP

Answer 2

Well If I am in wrong place, can anybody suggest me the appropriate link where I should ask this question?

Answer 3

Hi Nayan,

If you want to ask the question about DirectX, please try to post in our Newsgroup microsoft.public.win32.programmer.directx with link:

http://www.microsoft.com/communities/newsgroups/list/en-us/default.aspx?dg=microsoft.public.win32.programmer.directx.video&cat=en_us_cad0a37e-ca44-499a-821e-45b8cd105c88&lang=en&cr=us


Best Regards,
Nancy

---

Please remember to mark the replies as answers if they help and unmark them if they provide no help.
Welcome to the All-In-One Code Framework! If you have any feedback, please tell us.