[1.16.4] Inventory icon render function

[Maverick]

I'm making a simple mod for 1.16.4, which will allow me to export inventory icons of all blocks and items to the separate 32*32 .png files. One guy told me that there is a render function for all inventory icons on game startup, but I have trouble with finding it in thousands lines of code. Does anyone know where exactly this function is located and how to replace it with my custom function?

Edited December 18, 2020 by Maverick

[ChampionAsh5357]

1 hour ago, Maverick said:

inventory icons of all blocks and items

An inventory only displays items, they are separate from blocks and should not be used interchangeably. All items are rendered through ItemRenderer.