TextureConverter: Implement grass palette conversion

Source: https://minecraft.fandom.com/wiki/Tint
Since the MineClone2 biomes do not entirely match with the Minecraft ones I picked the Minecraft biomes that seem to match them best.
This also changes the palette index of the nether to match the desert instead of the mesa biome
and changes the color of grass blocks in item form to the default minecraft one.

mods/ITEMS/mcl_core/nodes_base.lua

@@ -365,7 +365,7 @@ minetest.register_node("mcl_core:dirt_with_grass", {
 	overlay_tiles = {"mcl_core_grass_block_top.png", "", {name="mcl_core_grass_block_side_overlay.png", tileable_vertical=false}},
 	palette = "mcl_core_palette_grass.png",
 	palette_index = 0,
-	color = "#55aa60",
+	color = "#8EB971",
 	is_ground_content = true,
 	stack_max = 64,
 	groups = {handy=1,shovely=1,dirt=2,grass_block=1, grass_block_no_snow=1, soil=1, soil_sapling=2, soil_sugarcane=1, cultivatable=2, spreading_dirt_type=1, enderman_takable=1, building_block=1},

mods/MAPGEN/mcl_biomes/init.lua

@@ -1496,7 +1496,7 @@ local function register_dimension_biomes()
 		heat_point = 100,
 		humidity_point = 0,
 		_mcl_biome_type = "hot",
-		_mcl_palette_index = 19,
+		_mcl_palette_index = 17,
 	})
 
 	--[[ THE END ]]

tools/Texture_Converter.py

@@ -118,17 +118,6 @@ def colorize_alpha(colormap, source, colormap_pixel, texture_size, destination):
 	colorize(colormap, source, colormap_pixel, texture_size, tempfile2.name)
 	os.system("composite -compose Dst_In "+source+" "+tempfile2.name+" -alpha Set "+destination)
 
-# This function is unused atm.
-# TODO: Implemnt colormap extraction
-def extract_colormap(colormap, colormap_pixel, positions):
-	os.system("convert -size 16x16 canvas:black "+tempfile1.name)
-	x=0
-	y=0
-	for p in positions:
-		os.system("convert "+colormap+" -crop 1x1+"+colormap_pixel+" -depth 8 "+tempfile2.name)
-		os.system("composite -geometry 16x16+"+x+"+"+y+" "+tempfile2.name)
-		x = x+1
-
 def target_dir(directory):
 	if make_texture_pack:
 		return output_dir + "/" + output_dir_name
@@ -397,20 +386,60 @@ def convert_textures():
 		colorize_alpha(FOLIAG, tex_dir+"/blocks/vine.png", "16+39", str(PXSIZE), target_dir("/mods/ITEMS/mcl_core/textures")+"/mcl_core_vine.png")
 
 		# Tall grass, fern (inventory images)
-		pcol = "49+172" # Plains grass color
+		pcol = "50+173" # Plains grass color
 		colorize_alpha(GRASS, tex_dir+"/blocks/tallgrass.png", pcol, str(PXSIZE), target_dir("/mods/ITEMS/mcl_flowers/textures")+"/mcl_flowers_tallgrass_inv.png")
 		colorize_alpha(GRASS, tex_dir+"/blocks/fern.png", pcol, str(PXSIZE), target_dir("/mods/ITEMS/mcl_flowers/textures")+"/mcl_flowers_fern_inv.png")
 		colorize_alpha(GRASS, tex_dir+"/blocks/double_plant_fern_top.png", pcol, str(PXSIZE), target_dir("/mods/ITEMS/mcl_flowers/textures")+"/mcl_flowers_double_plant_fern_inv.png")
 		colorize_alpha(GRASS, tex_dir+"/blocks/double_plant_grass_top.png", pcol, str(PXSIZE), target_dir("/mods/ITEMS/mcl_flowers/textures")+"/mcl_flowers_double_plant_grass_inv.png")
 
-		# TODO: Convert grass palette
+		# Convert grass palette: https://minecraft.fandom.com/wiki/Tint
-
+		grass_colors = [
-		offset = [
+			# [Coords or #Color, AdditionalTint], # Index - Minecraft biome name (MineClone2 biome names)
-			[ pcol, "", "grass" ], # Default grass: Plains
+			["50+173"], # 0 - Plains (flat, Plains, Plains_beach, Plains_ocean, End)
+			["0+255"], # 1 - Savanna (Savanna, Savanna_beach, Savanna_ocean)
+			["255+255"], # 2 - Ice Spikes (IcePlainsSpikes, IcePlainsSpikes_ocean)
+			["255+255"], # 3 - Snowy Taiga (ColdTaiga, ColdTaiga_beach, ColdTaiga_beach_water, ColdTaiga_ocean)
+			["178+193"], # 4 - Giant Tree Taiga (MegaTaiga, MegaTaiga_ocean)
+			["178+193"], # 5 - Giant Tree Taiga (MegaSpruceTaiga, MegaSpruceTaiga_ocean)
+			["203+239"], # 6 - Montains (ExtremeHills, ExtremeHills_beach, ExtremeHills_ocean)
+			["203+239"], # 7 - Montains (ExtremeHillsM, ExtremeHillsM_ocean)
+			["203+239"], # 8 - Montains (ExtremeHills+, ExtremeHills+_snowtop, ExtremeHills+_ocean)
+			["50+173"], # 9 - Beach (StoneBeach, StoneBeach_ocean)
+			["255+255"], # 10 - Snowy Tundra (IcePlains, IcePlains_ocean)
+			["50+173"], # 11 - Sunflower Plains (SunflowerPlains, SunflowerPlains_ocean)
+			["191+203"], # 12 - Taiga (Taiga, Taiga_beach, Taiga_ocean)
+			["76+112"], # 13 - Forest (Forest, Forest_beach, Forest_ocean)
+			["76+112"], # 14 - Flower Forest (FlowerForest, FlowerForest_beach, FlowerForest_ocean)
+			["101+163"], # 15 - Birch Forest (BirchForest, BirchForest_ocean)
+			["101+163"], # 16 - Birch Forest Hills (BirchForestM, BirchForestM_ocean)
+			["0+255"], # 17 - Desert and Nether (Desert, Desert_ocean, Nether)
+			["76+112", "#28340A"], # 18 - Dark Forest (RoofedForest, RoofedForest_ocean)
+			["#90814d"], # 19 - Mesa (Mesa, Mesa_sandlevel, Mesa_ocean, )
+			["#90814d"], # 20 - Mesa (MesaBryce, MesaBryce_sandlevel, MesaBryce_ocean)
+			["#90814d"], # 21 - Mesa (MesaPlateauF, MesaPlateauF_grasstop, MesaPlateauF_sandlevel, MesaPlateauF_ocean)
+			["#90814d"], # 22 - Mesa (MesaPlateauFM, MesaPlateauFM_grasstop, MesaPlateauFM_sandlevel, MesaPlateauFM_ocean)
+			["0+255"], # 23 - Shattered Savanna (or Savanna Plateau ?) (SavannaM, SavannaM_ocean)
+			["12+36"], # 24 - Jungle (Jungle, Jungle_shore, Jungle_ocean)
+			["12+36"], # 25 - Modified Jungle (JungleM, JungleM_shore, JungleM_ocean)
+			["12+61"], # 26 - Jungle Edge (JungleEdge, JungleEdge_ocean)
+			["12+61"], # 27 - Modified Jungle Edge (JungleEdgeM, JungleEdgeM_ocean)
+			["#6A7039"], # 28 - Swamp (Swampland, Swampland_shore, Swampland_ocean)
+			["25+25"], # 29 - Mushroom Fields and Mushroom Field Shore (MushroomIsland, MushroomIslandShore, MushroomIsland_ocean)
 		]
-		for o in offset:
+
-			colorize(GRASS, tex_dir+"/blocks/grass_top.png", o[0], str(PXSIZE), target_dir("/mods/ITEMS/mcl_core/textures")+"/default_"+o[2]+".png")
+		grass_palette_file = target_dir("/mods/ITEMS/mcl_core/textures") + "/mcl_core_palette_grass.png"
-			colorize_alpha(GRASS, tex_dir+"/blocks/grass_side_overlay.png", o[0], str(PXSIZE), target_dir("/mods/ITEMS/mcl_core/textures")+"/default_"+o[2]+"_side.png")
+		os.system("convert -size 16x16 canvas:transparent " + grass_palette_file)
+
+		for i, color in enumerate(grass_colors):
+			if color[0][0] == "#":
+				os.system("convert -size 1x1 xc:\"" + color[0] + "\" " + tempfile1.name + ".png")
+			else:
+				os.system("convert " + GRASS + " -crop 1x1+" + color[0] + " " + tempfile1.name + ".png")
+
+			if len(color) > 1:
+				os.system("convert " + tempfile1.name + ".png \\( -size 1x1 xc:\"" + color[1] + "\" \\) -compose blend -define compose:args=50,50 -composite " + tempfile1.name + ".png")
+
+			os.system("convert " + grass_palette_file + " \\( " + tempfile1.name + ".png -geometry +" + str(i % 16) + "+" + str(int(i / 16)) + " \\) -composite " + grass_palette_file)
 
 		# Metadata
 		if make_texture_pack: