Maybe it's a good chance for supporting #1068.

I'm not a fan of this filename stuff, imo this should be focused on Pictures only (for other stuff there could be an additional config option in our editor cough).

But I like this Pixman op -> enum mapping. Will adopt this...

Default, // SRC or OVER depending on the image
Normal,  // OP_OVER
NormalWithoutAlpha, // OP_SRC
XOR,
Additive,
Multiply,
Overlay,
Saturate,
Darken,
Lighten,
ColorDodge,
ColorBurn,
Difference,
Exclusion,
SoftLight,
HardLight

Added blending based on the filename but this is more for playing around. Not sure if we should keep this abomination (or move it at least to a different PR)

I remove the filename based Blend Mode for now and only focus on the Maniacs part.
But I will keep the Get/SetFilename part of Bitmap because this is nice for debugging.

@gadesx you played around with some of the features already. Could you also test the rest?

The stuff that should work is:

For Show Picture:

• All the Blend Modes
• Flip X/Y
• NOT SUPPORTED: Origin and fixed rotation

For Move Picture:

• All the Blend Modes
• Flip X/Y
• NOT SUPPORTED: Origin and fixed rotation

For Erase Picture:

• Everything

"Variable ID" should also work for most of the options but I did not check all of them.

@gadesx you played around with some of the features already. Could you also test the rest?

For Show Picture:

All the Blend Modes ------------- WORKS
Flip X/Y            ------------- WORKS

For Move Picture:

All the Blend Modes ------------- WORKS
Flip X/Y            ------------- WORKS

For Erase Picture:

Everything            ------------- WORKS

Can this be merged? There was no further feedback since weeks on this ^^