How to disable turf/background from interfering with blend_mode

ID:2153300
 
Sep 28 2016, 11:09 pm (Edited on Sep 29 2016, 11:19 am)
 
mob
    verb
        BlendTest()
            var/icon/i=new('BaseM.dmi',"effect")//arm missing filled outline
            var/icon/playericon=new(src.icon)//copy of playersicon
            playericon+=rgb(255,255,255)//Make player icon pure white
            playericon.Blend(i,ICON_OVERLAY)//puts black arm overlaying over real arm
            playericon.SwapColor(rgb(0,0,0),null)//Removes the black arm
            var/obj/removearm=new
            appearance_flags=KEEP_TOGETHER
            removearm.icon=playericon//set its icon to the white shape of mob without arm
            blend_mode=BLEND_MULTIPLY//helps crops player the dimensions of icon with no arm
            overlays+=removearm


My goal is to eventually make this code use not a single icon operation.

So there is pure white filled mob outline with an arm missing. I'm using blend_multiple to crop the players icon to the filled outline. The problem is the blend_mode=multiply is also applying to the turfs below it. I was told appearance_flags=KEEP_TOGETHER would prevent this from happening
Sep 29 2016, 3:36 pm
Right now you're taking the player's base icon, overlaying a white and black texture, and them multiplying the end result to the ground.

Do it the other way around. Make src's appearance the black and white icon and multiply the original texture onto that. The goal is to have the BLEND_MULTIPLY object not also be the one with KEEP_TOGETHER.
Sep 29 2016, 3:55 pm
 
mob
    verb
        BlendTest()
            var/icon/i=new('BaseM.dmi',"effect")//arm missing filled outline
            var/icon/playericon=new(src.icon)//copy of playersicon
            playericon+=rgb(255,255,255)//Make player icon pure white
            playericon.Blend(i,ICON_OVERLAY)//puts black arm overlaying over real arm
            playericon.SwapColor(rgb(0,0,0),null)//Removes the black arm
            var/obj/removearm=new
            appearance_flags=KEEP_TOGETHER
            blend_mode=BLEND_ADD//crops player the dimensions of icon with no arm
            removearm.blend_mode=BLEND_MULTIPLY//crops player the dimensions of icon with no arm
            removearm.icon='BaseM.dmi'
            src.icon=playericon
            overlays+=removearm



Wasn't successful.