Ok, I want to do version of Custom Item Textures from MCPatcher compatible with OptiFine and MultiMC. And I need information about every Item's texture associated with this Item. And as way to get it I choose to place method invoke in registerIcon method of TextureMap (the method that every Item use in they are registerIcons method).
As I understand TextureStitchEvent emit before and after all textures registered.
PS. can't find way to make OptiFine and MultiMC work with MCPatcher at the start moment. If someone have a proper way feel free to msg me . But I continue mod, 'cause I like process.