Photoshop Action to make mirrored tiling images

Question

Let's say I have many 1:1 ratio (square) images of varying pixel dimensions and I want to make them double the resolution and flip them on both X and Y axes so that they create a mirrored tile.

For example, going from this:

To this:

It's easy to do manually, but how can I program it as an Action?

All the operations for moving the duplicated and flipped layers that I can think of are specified in pixel dimensions, not percentages. This has so far prevented me from being able to define an Action that works for images of all sizes.

_{Image courtesy of Pixabay}

Answer 1

Never mind, I got it.

The trick was to use the Transform tool instead of dragging manually or using Offset.

Steps in the Action

_{Note: Assumes we are starting with a flat image.}

1. Set Background Double-click on the layer titled Background so that it becomes Layer 0.

2. Canvas Size Set Width and Height to 100%, Relative, with the Anchor in one of the corners.

3. Duplicate Current Layer Drag the layer to the [+] in the Layers Panel

4. Transform Current Layer CmdT Place the anchor opposite of where it was during the Canvas Size operation. Set Width to -100%.

5. Merge Layers CmdE

6. Duplicate Current Layer Drag the layer to the [+] in the Layers Panel

7. Transform Current Layer CmdT Place the anchor on the top or bottom, whichever is the center of the image for you. Set Height to -100%.

8. Flatten Image Layer → Flatten Image

_{The Action can of course be defined in four different ways, depending on which corner you use as your Anchor.}