src/game/java/net/minecraft/client/Screenshot.java

package net.minecraft.client;

import com.mojang.blaze3d.pipeline.RenderTarget;
import com.mojang.blaze3d.platform.NativeImage;
import com.mojang.blaze3d.systems.RenderSystem;
import com.mojang.logging.LogUtils;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.function.Consumer;
import javax.annotation.Nullable;
import net.minecraft.ChatFormatting;
import net.minecraft.Util;
import net.minecraft.network.chat.ClickEvent;
import net.minecraft.network.chat.Component;
import net.minecraft.network.chat.Style;
import net.minecraftforge.api.distmarker.Dist;
import net.minecraftforge.api.distmarker.OnlyIn;
import org.slf4j.Logger;

@OnlyIn(Dist.CLIENT)
public class Screenshot {
    private static final Logger LOGGER = LogUtils.getLogger();
    public static final String SCREENSHOT_DIR = "screenshots";
    private int rowHeight;
    private final DataOutputStream outputStream;
    private final byte[] bytes;
    private final int width;
    private final int height;
    private File file;

    public static void grab(File p_92290_, RenderTarget p_92293_, Consumer<Component> p_92294_) {
        grab(p_92290_, null, p_92293_, p_92294_);
    }

    public static void grab(File p_92296_, @Nullable String p_92297_, RenderTarget p_92300_, Consumer<Component> p_92301_) {
        if (!RenderSystem.isOnRenderThread()) {
            RenderSystem.recordRenderCall(() -> _grab(p_92296_, p_92297_, p_92300_, p_92301_));
        } else {
            _grab(p_92296_, p_92297_, p_92300_, p_92301_);
        }
    }

    private static void _grab(File p_92306_, @Nullable String p_92307_, RenderTarget p_92310_, Consumer<Component> p_92311_) {
        NativeImage nativeimage = takeScreenshot(p_92310_);
        File file1 = new File(p_92306_, "screenshots");
        file1.mkdir();
        File file2;
        if (p_92307_ == null) {
            file2 = getFile(file1);
        } else {
            file2 = new File(file1, p_92307_);
        }

        Util.ioPool()
            .execute(
                () -> {
                    try {
                        nativeimage.writeToFile(file2);
                        Component component = Component.literal(file2.getName())
                            .withStyle(ChatFormatting.UNDERLINE)
                            .withStyle(p_168608_ -> p_168608_.withClickEvent(new ClickEvent(ClickEvent.Action.OPEN_FILE, file2.getAbsolutePath())));
                        p_92311_.accept(Component.translatable("screenshot.success", component));
                    } catch (Exception exception) {
                        LOGGER.warn("Couldn't save screenshot", (Throwable)exception);
                        p_92311_.accept(Component.translatable("screenshot.failure", exception.getMessage()));
                    } finally {
                        nativeimage.close();
                    }
                }
            );
    }

    public static NativeImage takeScreenshot(RenderTarget p_92282_) {
        int i = p_92282_.width;
        int j = p_92282_.height;
        NativeImage nativeimage = new NativeImage(i, j, false);
        RenderSystem.bindTexture(p_92282_.getColorTextureId());
        nativeimage.downloadTexture(0, true);
        nativeimage.flipY();
        return nativeimage;
    }

    private static File getFile(File p_92288_) {
        String s = Util.getFilenameFormattedDateTime();
        int i = 1;

        while (true) {
            File file1 = new File(p_92288_, s + (i == 1 ? "" : "_" + i) + ".png");
            if (!file1.exists()) {
                return file1;
            }

            i++;
        }
    }

    public Screenshot(File p_168601_, int p_168602_, int p_168603_, int p_168604_) throws IOException {
        this.width = p_168602_;
        this.height = p_168603_;
        this.rowHeight = p_168604_;
        File file1 = new File(p_168601_, "screenshots");
        file1.mkdir();
        String s = "huge_" + Util.getFilenameFormattedDateTime();
        int i = 1;

        while ((this.file = new File(file1, s + (i == 1 ? "" : "_" + i) + ".tga")).exists()) {
            i++;
        }

        byte[] abyte = new byte[18];
        abyte[2] = 2;
        abyte[12] = (byte)(p_168602_ % 256);
        abyte[13] = (byte)(p_168602_ / 256);
        abyte[14] = (byte)(p_168603_ % 256);
        abyte[15] = (byte)(p_168603_ / 256);
        abyte[16] = 24;
        this.bytes = new byte[p_168602_ * p_168604_ * 3];
        this.outputStream = new DataOutputStream(new FileOutputStream(this.file));
        this.outputStream.write(abyte);
    }

    public void addRegion(ByteBuffer p_168610_, int p_168611_, int p_168612_, int p_168613_, int p_168614_) {
        int i = p_168613_;
        int j = p_168614_;
        if (p_168613_ > this.width - p_168611_) {
            i = this.width - p_168611_;
        }

        if (p_168614_ > this.height - p_168612_) {
            j = this.height - p_168612_;
        }

        this.rowHeight = j;

        for (int k = 0; k < j; k++) {
            p_168610_.position((p_168614_ - j) * p_168613_ * 3 + k * p_168613_ * 3);
            int l = (p_168611_ + k * this.width) * 3;
            p_168610_.get(this.bytes, l, i * 3);
        }
    }

    public void saveRow() throws IOException {
        this.outputStream.write(this.bytes, 0, this.width * 3 * this.rowHeight);
    }

    public File close() throws IOException {
        this.outputStream.close();
        return this.file;
    }
}