Save the file to write the updated offsets back into the PNG
The backing selector provides two view modes:
Sprite for standard sprite-style offset editing
HUD for screen-space weapon/HUD alignment against a 320x200 reference plane
Automatic Offset Modes
The editor includes SLADE-style auto offset presets:
Monster
Monster (GL-friendly)
Projectile
Hud/Weapon
Hud/Weapon (Doom)
Hud/Weapon (Heretic)
Hud/Weapon (Hexen)
These presets are intended to make common sprite setup faster, especially when the origin should sit outside the visible image for HUD weapon graphics.
Bulk Editing
You can also update multiple PNG files at once from the Explorer:
Select one or more .png files
Right-click and choose Modify Offsets
Choose either:
Set Offsets to apply exact X/Y values to every file
Adjust Offsets Relatively to add X/Y deltas to each file's current offsets
Apply Auto Offsets to calculate offsets for each file from a preset
Enter the X and Y values when prompted, or choose an automatic offset preset
AI Disclosure
This project was created using Codex as an experiment. It turned out a lot more competent than I was expecting, so I figured I'd publish it for anyone else who might get use out of it.
