I'm trying to write a screensaver for a Windows platform using C++ and Win APIs. To render graphics I'm using GDI+, but the issue is rendering png's with some small amount of animation (fade-in and -out) becomes very "CPU heavy."
So I was wondering if there's a way to enable GPU acceleration for GDI+ APIs? And if it's not possible, is there something that I can use from a non-managed code that supports GPU acceleration (apart from OpenGL or DirectX)?
Nope. GDI is mostly about manipulation of in memory bitmaps when it comes down to it. If you want more advanced features, use Direct3D/2D.