    001package net.minecraft.util;
    002
    003import cpw.mods.fml.relauncher.Side;
    004import cpw.mods.fml.relauncher.SideOnly;
    005import java.awt.image.BufferedImage;
    006import java.io.File;
    007import java.nio.IntBuffer;
    008import java.text.DateFormat;
    009import java.text.SimpleDateFormat;
    010import java.util.Date;
    011import javax.imageio.ImageIO;
    012import org.lwjgl.BufferUtils;
    013import org.lwjgl.opengl.GL11;
    014import org.lwjgl.opengl.GL12;
    015
    016@SideOnly(Side.CLIENT)
    017public class ScreenShotHelper
    018{
    019    private static final DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd_HH.mm.ss");
    020    private static IntBuffer field_74293_b;
    021    private static int[] field_74294_c;
    022
    023    /**
    024     * Takes a screenshot and saves it to the screenshots directory. Returns the filename of the screenshot.
    025     */
    026    public static String saveScreenshot(File par0File, int par1, int par2)
    027    {
    028        return func_74292_a(par0File, (String)null, par1, par2);
    029    }
    030
    031    public static String func_74292_a(File par0File, String par1Str, int par2, int par3)
    032    {
    033        try
    034        {
    035            File var4 = new File(par0File, "screenshots");
    036            var4.mkdir();
    037            int var5 = par2 * par3;
    038
    039            if (field_74293_b == null || field_74293_b.capacity() < var5)
    040            {
    041                field_74293_b = BufferUtils.createIntBuffer(var5);
    042                field_74294_c = new int[var5];
    043            }
    044
    045            GL11.glPixelStorei(GL11.GL_PACK_ALIGNMENT, 1);
    046            GL11.glPixelStorei(GL11.GL_UNPACK_ALIGNMENT, 1);
    047            field_74293_b.clear();
    048            GL11.glReadPixels(0, 0, par2, par3, GL12.GL_BGRA, GL12.GL_UNSIGNED_INT_8_8_8_8_REV, field_74293_b);
    049            field_74293_b.get(field_74294_c);
    050            func_74289_a(field_74294_c, par2, par3);
    051            BufferedImage var6 = new BufferedImage(par2, par3, 1);
    052            var6.setRGB(0, 0, par2, par3, field_74294_c, 0, par2);
    053            File var7;
    054
    055            if (par1Str == null)
    056            {
    057                var7 = func_74290_a(var4);
    058            }
    059            else
    060            {
    061                var7 = new File(var4, par1Str);
    062            }
    063
    064            ImageIO.write(var6, "png", var7);
    065            return "Saved screenshot as " + var7.getName();
    066        }
    067        catch (Exception var8)
    068        {
    069            var8.printStackTrace();
    070            return "Failed to save: " + var8;
    071        }
    072    }
    073
    074    private static File func_74290_a(File par0File)
    075    {
    076        String var2 = dateFormat.format(new Date()).toString();
    077        int var3 = 1;
    078
    079        while (true)
    080        {
    081            File var1 = new File(par0File, var2 + (var3 == 1 ? "" : "_" + var3) + ".png");
    082
    083            if (!var1.exists())
    084            {
    085                return var1;
    086            }
    087
    088            ++var3;
    089        }
    090    }
    091
    092    private static void func_74289_a(int[] par0ArrayOfInteger, int par1, int par2)
    093    {
    094        int[] var3 = new int[par1];
    095        int var4 = par2 / 2;
    096
    097        for (int var5 = 0; var5 < var4; ++var5)
    098        {
    099            System.arraycopy(par0ArrayOfInteger, var5 * par1, var3, 0, par1);
    100            System.arraycopy(par0ArrayOfInteger, (par2 - 1 - var5) * par1, par0ArrayOfInteger, var5 * par1, par1);
    101            System.arraycopy(var3, 0, par0ArrayOfInteger, (par2 - 1 - var5) * par1, par1);
    102        }
    103    }
    104}