001    package net.minecraft.util;
002    
003    import cpw.mods.fml.relauncher.Side;
004    import cpw.mods.fml.relauncher.SideOnly;
005    import java.awt.image.BufferedImage;
006    import java.io.File;
007    import java.nio.IntBuffer;
008    import java.text.DateFormat;
009    import java.text.SimpleDateFormat;
010    import java.util.Date;
011    import javax.imageio.ImageIO;
012    import org.lwjgl.BufferUtils;
013    import org.lwjgl.opengl.GL11;
014    import org.lwjgl.opengl.GL12;
015    
016    @SideOnly(Side.CLIENT)
017    public 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    }