Code/net/minecraft/client/renderer/texture/atlas/sources/PalettedPermutations.java

package net.minecraft.client.renderer.texture.atlas.sources;

import com.google.common.base.Suppliers;
import com.mojang.blaze3d.platform.NativeImage;
import com.mojang.logging.LogUtils;
import com.mojang.serialization.Codec;
import com.mojang.serialization.MapCodec;
import com.mojang.serialization.codecs.RecordCodecBuilder;
import com.mojang.serialization.codecs.RecordCodecBuilder.Instance;
import it.unimi.dsi.fastutil.ints.Int2IntMap;
import it.unimi.dsi.fastutil.ints.Int2IntOpenHashMap;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.Map.Entry;
import java.util.function.IntUnaryOperator;
import java.util.function.Supplier;
import javax.annotation.Nullable;
import net.minecraft.client.renderer.texture.SpriteContents;
import net.minecraft.client.renderer.texture.atlas.SpriteResourceLoader;
import net.minecraft.client.renderer.texture.atlas.SpriteSource;
import net.minecraft.client.resources.metadata.animation.FrameSize;
import net.minecraft.resources.ResourceLocation;
import net.minecraft.server.packs.resources.Resource;
import net.minecraft.server.packs.resources.ResourceManager;
import net.minecraft.server.packs.resources.ResourceMetadata;
import net.minecraft.util.ARGB;
import net.minecraftforge.api.distmarker.Dist;
import net.minecraftforge.api.distmarker.OnlyIn;
import org.slf4j.Logger;

@OnlyIn(Dist.CLIENT)
public record PalettedPermutations(List<ResourceLocation> textures, ResourceLocation paletteKey, Map<String, ResourceLocation> permutations, String separator)
    implements SpriteSource {
    static final Logger LOGGER = LogUtils.getLogger();
    public static final String DEFAULT_SEPARATOR = "_";
    public static final MapCodec<PalettedPermutations> MAP_CODEC = RecordCodecBuilder.mapCodec(
        p_389561_ -> p_389561_.group(
                Codec.list(ResourceLocation.CODEC).fieldOf("textures").forGetter(PalettedPermutations::textures),
                ResourceLocation.CODEC.fieldOf("palette_key").forGetter(PalettedPermutations::paletteKey),
                Codec.unboundedMap(Codec.STRING, ResourceLocation.CODEC).fieldOf("permutations").forGetter(PalettedPermutations::permutations),
                Codec.STRING.optionalFieldOf("separator", "_").forGetter(PalettedPermutations::separator)
            )
            .apply(p_389561_, PalettedPermutations::new)
    );

    public PalettedPermutations(List<ResourceLocation> p_267282_, ResourceLocation p_266681_, Map<String, ResourceLocation> p_266741_) {
        this(p_267282_, p_266681_, p_266741_, "_");
    }

    @Override
    public void run(ResourceManager p_267219_, SpriteSource.Output p_267250_) {
        Supplier<int[]> supplier = Suppliers.memoize(() -> loadPaletteEntryFromImage(p_267219_, this.paletteKey));
        Map<String, Supplier<IntUnaryOperator>> map = new HashMap<>();
        this.permutations
            .forEach((p_267108_, p_266969_) -> map.put(p_267108_, Suppliers.memoize(() -> createPaletteMapping(supplier.get(), loadPaletteEntryFromImage(p_267219_, p_266969_)))));

        for (ResourceLocation resourcelocation : this.textures) {
            ResourceLocation resourcelocation1 = TEXTURE_ID_CONVERTER.idToFile(resourcelocation);
            Optional<Resource> optional = p_267219_.getResource(resourcelocation1);
            if (optional.isEmpty()) {
                LOGGER.warn("Unable to find texture {}", resourcelocation1);
            } else {
                LazyLoadedImage lazyloadedimage = new LazyLoadedImage(resourcelocation1, optional.get(), map.size());

                for (Entry<String, Supplier<IntUnaryOperator>> entry : map.entrySet()) {
                    ResourceLocation resourcelocation2 = resourcelocation.withSuffix(this.separator + entry.getKey());
                    p_267250_.add(
                        resourcelocation2, new PalettedPermutations.PalettedSpriteSupplier(lazyloadedimage, entry.getValue(), resourcelocation2)
                    );
                }
            }
        }
    }

    private static IntUnaryOperator createPaletteMapping(int[] p_266839_, int[] p_266776_) {
        if (p_266776_.length != p_266839_.length) {
            LOGGER.warn("Palette mapping has different sizes: {} and {}", p_266839_.length, p_266776_.length);
            throw new IllegalArgumentException();
        } else {
            Int2IntMap int2intmap = new Int2IntOpenHashMap(p_266776_.length);

            for (int i = 0; i < p_266839_.length; i++) {
                int j = p_266839_[i];
                if (ARGB.alpha(j) != 0) {
                    int2intmap.put(ARGB.transparent(j), p_266776_[i]);
                }
            }

            return p_358029_ -> {
                int k = ARGB.alpha(p_358029_);
                if (k == 0) {
                    return p_358029_;
                } else {
                    int l = ARGB.transparent(p_358029_);
                    int i1 = int2intmap.getOrDefault(l, ARGB.opaque(l));
                    int j1 = ARGB.alpha(i1);
                    return ARGB.color(k * j1 / 255, i1);
                }
            };
        }
    }

    private static int[] loadPaletteEntryFromImage(ResourceManager p_267184_, ResourceLocation p_267059_) {
        Optional<Resource> optional = p_267184_.getResource(TEXTURE_ID_CONVERTER.idToFile(p_267059_));
        if (optional.isEmpty()) {
            LOGGER.error("Failed to load palette image {}", p_267059_);
            throw new IllegalArgumentException();
        } else {
            try {
                int[] aint;
                try (
                    InputStream inputstream = optional.get().open();
                    NativeImage nativeimage = NativeImage.read(inputstream);
                ) {
                    aint = nativeimage.getPixels();
                }

                return aint;
            } catch (Exception exception) {
                LOGGER.error("Couldn't load texture {}", p_267059_, exception);
                throw new IllegalArgumentException();
            }
        }
    }

    @Override
    public MapCodec<PalettedPermutations> codec() {
        return MAP_CODEC;
    }

    @OnlyIn(Dist.CLIENT)
    record PalettedSpriteSupplier(LazyLoadedImage baseImage, Supplier<IntUnaryOperator> palette, ResourceLocation permutationLocation)
        implements SpriteSource.SpriteSupplier {
        @Nullable
        public SpriteContents apply(SpriteResourceLoader p_300667_) {
            Object object;
            try {
                NativeImage nativeimage = this.baseImage.get().mappedCopy(this.palette.get());
                return new SpriteContents(
                    this.permutationLocation, new FrameSize(nativeimage.getWidth(), nativeimage.getHeight()), nativeimage, ResourceMetadata.EMPTY
                );
            } catch (IllegalArgumentException | IOException ioexception) {
                PalettedPermutations.LOGGER.error("unable to apply palette to {}", this.permutationLocation, ioexception);
                object = null;
            } finally {
                this.baseImage.release();
            }

            return (SpriteContents)object;
        }

        @Override
        public void discard() {
            this.baseImage.release();
        }
    }
}