Hi
I need to rotate and change angle of some images.
Tried to use SetWorldTransform with no success. Please help

show your code, example from msdn:
https://docs.microsoft.com/en-us/windows/win32/gdi/using-coordinate-spaces-and-transformations

p.s. you can do it manually by add/subtracting each x,y coordinates of every vertex.

That is a problem, I don't want to draw picture manually, I need to load turned image from file.
Actually I know how to do that: Open file in memory, decompress it to BMP, rotate, compress back to ICO or something with transparate, then load as resource for child window. But I'm looking for some less painful way to do that

i found cpp code that does that:
https://www.codeguru.com/cpp/g-m/bitmap/specialeffects/article.php/c1743/Rotate-a-bitmap-image.htm

its not perfect, but at least it tells you the steps required or the order of doing ..

~

also searching old help files i found PlgBlt with a description saying it can be used for rotation, but personally i never seen this function.

Thanks, I'll take a look on it

Looks like there is nothing special. In that scenario I prefer to use own skill by FPU to rotate already preloaded image as I said.

With just GDI, DrawImage is probably the easies way

DrawImage

https://docs.microsoft.com/en-us/windows/win32/gdiplus/-gdiplus-rotating-reflecting-and-skewing-images-use

SetWorldTransform should work though https://docs.microsoft.com/en-us/windows/win32/gdi/rotation and then Direct2D (D3D, etc..) on top of that.

DrawImage is GDI+

Seems like masm32 accept GDI+ methods (GdipDrawImage). How to call it via Fasm?

then just use invoke or call in your code.