Ports /vg/ chem weighted colour averaging

code/modules/reagents/Chemistry-Colours.dm

@@ -1,45 +1,24 @@
-/proc/GetColors(hex)
-	hex = uppertext(hex)
-	// No alpha set? Default to full alpha.
-	if(length(hex) == 7)
-		hex += "FF"
-	var/hi1 = text2ascii(hex, 2) // R
-	var/lo1 = text2ascii(hex, 3) // R
-	var/hi2 = text2ascii(hex, 4) // G
-	var/lo2 = text2ascii(hex, 5) // G
-	var/hi3 = text2ascii(hex, 6) // B
-	var/lo3 = text2ascii(hex, 7) // B
-	var/hi4 = text2ascii(hex, 8) // A
-	var/lo4 = text2ascii(hex, 9) // A
-	return list(((hi1>= 65 ? hi1-55 : hi1-48)<<4) | (lo1 >= 65 ? lo1-55 : lo1-48),
-		((hi2 >= 65 ? hi2-55 : hi2-48)<<4) | (lo2 >= 65 ? lo2-55 : lo2-48),
-		((hi3 >= 65 ? hi3-55 : hi3-48)<<4) | (lo3 >= 65 ? lo3-55 : lo3-48),
-		((hi4 >= 65 ? hi4-55 : hi4-48)<<4) | (lo4 >= 65 ? lo4-55 : lo4-48))
 
 /proc/mix_color_from_reagents(var/list/reagent_list)
-	if(!reagent_list || !reagent_list.len) return 0
+	if(!istype(reagent_list))
+		return
 
-	var/list/rgbcolor = list(0,0,0,0)
-	var/finalcolor = 0
-	for(var/datum/reagent/re in reagent_list) // natural color mixing bullshit/algorithm
-		if(!finalcolor)
-			rgbcolor = GetColors(re.color)
-			finalcolor = re.color
+	var/color
+	var/vol_counter = 0
+	var/vol_temp
+
+	for(var/datum/reagent/R in reagent_list)
+		vol_temp = R.volume
+		vol_counter += vol_temp
+
+		if(!color)
+			color = R.color
+
+		else if (length(color) >= length(R.color))
+			color = BlendRGB(color, R.color, vol_temp/vol_counter)
 		else
-			var/newcolor[4]
-			var/prergbcolor[4]
-			prergbcolor = rgbcolor
-			newcolor = GetColors(re.color)
+			color = BlendRGB(R.color, color, vol_temp/vol_counter)
 
-			rgbcolor[1] = (prergbcolor[1]+newcolor[1])/2
-			rgbcolor[2] = (prergbcolor[2]+newcolor[2])/2
-			rgbcolor[3] = (prergbcolor[3]+newcolor[3])/2
-			rgbcolor[4] = (prergbcolor[4]+newcolor[4])/2
+	return color
 
-			finalcolor = rgb(rgbcolor[1], rgbcolor[2], rgbcolor[3], rgbcolor[4])
-	return finalcolor
 
-// This isn't a perfect color mixing system, the more reagents that are inside,
-// the darker it gets until it becomes absolutely pitch black! I dunno, maybe
-// that's pretty realistic? I don't do a whole lot of color-mixing anyway.
-// If you add brighter colors to it it'll eventually get lighter, though.