improve texture slicing; support non-symmetrical slicing #13488
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Objective
Previously, it was impossible to use a texture slicer when the 'center' was not in the exact center of the source image. This PR aims to fix that.
Solution
Changed the slicing algorithm to allow for non-symmetrical slicing.
Code cleanup.
Adjusted the relevant example to show that it's possible.
Fixed some bugs.
Before:
After:
Testing
I tested these changes using the ui_texture_slice example. As far as my testing goes, it works as intended, but it is possible I missed some weird edge case.
Changelog
Changed the texture slicing algorithm.
Changed the ui_texture_slice example.
Added panel-border-020.png asset to showcase the changes.