SDL_CreateAnimatedCursor() creates DPI scaled cursors on Windows

[slouken]

It looks like CreateIconFromResource() automatically DPI scales the cursor, whereas CreateIconIndirect() does not. Since icon resources can contain multiple sizes of cursors, I'm guessing that CreateIconFromResource() will do the right thing if we just provide all the alternate surface images for a cursor, and we can just use that as our single cursor path.

As it is, if you create an animated cursor (with multiple frames since 23fcf53), it will be larger than a single frame cursor of the same size, when DPI scaling is enabled.

[slouken]

I'm adding animated cursor support to SDL_image in libsdl-org/SDL_image#638, which might be relevant. I'm going to be adding support for alternate images and saving ICO/CUR files.

[slouken]

By the way, you can actually create larger cursors than 256x256 by storing them as PNG images. I'm not sure what the icon directory size would be in this case. I imagine the width and height would be left 0 in this case.

[slouken]

I didn't end up writing ICO/CUR save code for SDL_image, but my ideas are fresh in my mind, so I'll go ahead and take a crack at this issue now.

[Kontrabant]

Looking into this now.

[slouken]

Looking into this now.

I'm already on it, I have a PR for review :)