src/game/java/net/minecraft/client/renderer/texture/MissingTextureAtlasSprite.java

package net.minecraft.client.renderer.texture;

import com.mojang.blaze3d.platform.NativeImage;
import net.minecraft.client.resources.metadata.animation.FrameSize;
import net.minecraft.resources.ResourceLocation;
import net.minecraft.server.packs.resources.ResourceMetadata;
import net.minecraftforge.api.distmarker.Dist;
import net.minecraftforge.api.distmarker.OnlyIn;

@OnlyIn(Dist.CLIENT)
public final class MissingTextureAtlasSprite {
    private static final int MISSING_IMAGE_WIDTH = 16;
    private static final int MISSING_IMAGE_HEIGHT = 16;
    private static final String MISSING_TEXTURE_NAME = "missingno";
    private static final ResourceLocation MISSING_TEXTURE_LOCATION = ResourceLocation.withDefaultNamespace("missingno");

    public static NativeImage generateMissingImage() {
        return generateMissingImage(16, 16);
    }

    public static NativeImage generateMissingImage(int p_249811_, int p_249362_) {
        NativeImage nativeimage = new NativeImage(p_249811_, p_249362_, false);
        int i = -524040;

        for (int j = 0; j < p_249362_; j++) {
            for (int k = 0; k < p_249811_; k++) {
                if (j < p_249362_ / 2 ^ k < p_249811_ / 2) {
                    nativeimage.setPixel(k, j, -524040);
                } else {
                    nativeimage.setPixel(k, j, -16777216);
                }
            }
        }

        return nativeimage;
    }

    public static SpriteContents create() {
        NativeImage nativeimage = generateMissingImage(16, 16);
        return new SpriteContents(MISSING_TEXTURE_LOCATION, new FrameSize(16, 16), nativeimage, ResourceMetadata.EMPTY);
    }

    public static ResourceLocation getLocation() {
        return MISSING_TEXTURE_LOCATION;
    }
}