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

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

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 java.util.List;
import java.util.Optional;
import net.minecraft.client.renderer.texture.MissingTextureAtlasSprite;
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.ExtraCodecs;
import net.minecraft.util.Mth;
import net.minecraftforge.api.distmarker.Dist;
import net.minecraftforge.api.distmarker.OnlyIn;
import org.slf4j.Logger;

@OnlyIn(Dist.CLIENT)
public record Unstitcher(ResourceLocation resource, List<Unstitcher.Region> regions, double xDivisor, double yDivisor) implements SpriteSource {
    static final Logger LOGGER = LogUtils.getLogger();
    public static final MapCodec<Unstitcher> MAP_CODEC = RecordCodecBuilder.mapCodec(
        p_262047_ -> p_262047_.group(
                ResourceLocation.CODEC.fieldOf("resource").forGetter(Unstitcher::resource),
                ExtraCodecs.nonEmptyList(Unstitcher.Region.CODEC.listOf()).fieldOf("regions").forGetter(Unstitcher::regions),
                Codec.DOUBLE.optionalFieldOf("divisor_x", 1.0).forGetter(Unstitcher::xDivisor),
                Codec.DOUBLE.optionalFieldOf("divisor_y", 1.0).forGetter(Unstitcher::yDivisor)
            )
            .apply(p_262047_, Unstitcher::new)
    );

    @Override
    public void run(ResourceManager p_261498_, SpriteSource.Output p_261828_) {
        ResourceLocation resourcelocation = TEXTURE_ID_CONVERTER.idToFile(this.resource);
        Optional<Resource> optional = p_261498_.getResource(resourcelocation);
        if (optional.isPresent()) {
            LazyLoadedImage lazyloadedimage = new LazyLoadedImage(resourcelocation, optional.get(), this.regions.size());

            for (Unstitcher.Region unstitcher$region : this.regions) {
                p_261828_.add(
                    unstitcher$region.sprite, new Unstitcher.RegionInstance(lazyloadedimage, unstitcher$region, this.xDivisor, this.yDivisor)
                );
            }
        } else {
            LOGGER.warn("Missing sprite: {}", resourcelocation);
        }
    }

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

    @OnlyIn(Dist.CLIENT)
    public record Region(ResourceLocation sprite, double x, double y, double width, double height) {
        public static final Codec<Unstitcher.Region> CODEC = RecordCodecBuilder.create(
            p_261521_ -> p_261521_.group(
                    ResourceLocation.CODEC.fieldOf("sprite").forGetter(Unstitcher.Region::sprite),
                    Codec.DOUBLE.fieldOf("x").forGetter(Unstitcher.Region::x),
                    Codec.DOUBLE.fieldOf("y").forGetter(Unstitcher.Region::y),
                    Codec.DOUBLE.fieldOf("width").forGetter(Unstitcher.Region::width),
                    Codec.DOUBLE.fieldOf("height").forGetter(Unstitcher.Region::height)
                )
                .apply(p_261521_, Unstitcher.Region::new)
        );
    }

    @OnlyIn(Dist.CLIENT)
    static class RegionInstance implements SpriteSource.SpriteSupplier {
        private final LazyLoadedImage image;
        private final Unstitcher.Region region;
        private final double xDivisor;
        private final double yDivisor;

        RegionInstance(LazyLoadedImage p_266678_, Unstitcher.Region p_267197_, double p_266911_, double p_266789_) {
            this.image = p_266678_;
            this.region = p_267197_;
            this.xDivisor = p_266911_;
            this.yDivisor = p_266789_;
        }

        public SpriteContents apply(SpriteResourceLoader p_297928_) {
            try {
                NativeImage nativeimage = this.image.get();
                double d0 = nativeimage.getWidth() / this.xDivisor;
                double d1 = nativeimage.getHeight() / this.yDivisor;
                int i = Mth.floor(this.region.x * d0);
                int j = Mth.floor(this.region.y * d1);
                int k = Mth.floor(this.region.width * d0);
                int l = Mth.floor(this.region.height * d1);
                NativeImage nativeimage1 = new NativeImage(NativeImage.Format.RGBA, k, l, false);
                nativeimage.copyRect(nativeimage1, i, j, 0, 0, k, l, false, false);
                return new SpriteContents(this.region.sprite, new FrameSize(k, l), nativeimage1, ResourceMetadata.EMPTY);
            } catch (Exception exception) {
                Unstitcher.LOGGER.error("Failed to unstitch region {}", this.region.sprite, exception);
            } finally {
                this.image.release();
            }

            return MissingTextureAtlasSprite.create();
        }

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