Added Video Export feature with according Options in the Options Menu

Fixed Linear Interpolation

src/main/java/eu/crushedpixel/replaymod/video/ReplayScreenshot.java

@@ -0,0 +1,185 @@
+package eu.crushedpixel.replaymod.video;
+
+import java.awt.Dimension;
+import java.awt.Rectangle;
+import java.awt.image.BufferedImage;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.nio.IntBuffer;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipInputStream;
+import java.util.zip.ZipOutputStream;
+
+import javax.imageio.ImageIO;
+
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.gui.GuiScreen;
+import net.minecraft.client.renderer.GlStateManager;
+import net.minecraft.client.renderer.OpenGlHelper;
+import net.minecraft.client.renderer.texture.TextureUtil;
+import net.minecraft.client.shader.Framebuffer;
+
+import org.lwjgl.BufferUtils;
+import org.lwjgl.opengl.GL11;
+import org.lwjgl.opengl.GL12;
+
+import eu.crushedpixel.replaymod.chat.ChatMessageRequests;
+import eu.crushedpixel.replaymod.chat.ChatMessageRequests.ChatMessageType;
+import eu.crushedpixel.replaymod.gui.GuiReplaySaving;
+import eu.crushedpixel.replaymod.replay.ReplayHandler;
+import eu.crushedpixel.replaymod.utils.ImageUtils;
+
+public class ReplayScreenshot {
+
+	private static Minecraft mc = Minecraft.getMinecraft();
+
+	private static final byte[] uniqueBytes = new byte[]{0,1,1,2,3,5,8};
+
+	private static long last_finish = -1;
+
+	private static boolean before;
+	private static double beforeSpeed;
+	private static GuiScreen beforeScreen;
+
+	public static void prepareScreenshot() {
+		System.out.println("thumbnail preparing");
+		before = mc.gameSettings.hideGUI;
+		beforeSpeed = ReplayHandler.getSpeed();
+		beforeScreen = mc.currentScreen;
+	}
+	
+	private static boolean locked = false;
+
+	public static void saveScreenshot(Framebuffer buffer) {
+
+		if(locked) return;
+		locked = true;
+		
+		System.out.println("thumbnail started");
+		try {
+			GuiReplaySaving.replaySaving = true;
+
+			mc.gameSettings.hideGUI = true;
+			mc.currentScreen = null;
+
+			mc.entityRenderer.updateCameraAndRender(0);
+			ReplayHandler.setSpeed(0);
+
+			final BufferedImage fbi = ScreenCapture.captureScreen();
+
+			mc.gameSettings.hideGUI = before;
+			mc.currentScreen = beforeScreen;
+			ReplayHandler.setSpeed(beforeSpeed);
+
+			//The actual cropping and saving should be executed in a separate thread
+			Thread ioThread = new Thread(new Runnable() {
+
+				@Override
+				public void run() {
+					try {
+						System.out.println("thumbnail saving started");
+						float aspect = 1280f/720f;
+
+						Rectangle rect;
+						if((float)fbi.getWidth()/(float)fbi.getHeight() <= aspect) {
+							int h = Math.round(fbi.getWidth()/aspect);
+							int y = (fbi.getHeight()/2) - (h/2);
+							rect = new Rectangle(0, y, fbi.getWidth(), h);
+						} else {
+							int w = Math.round(fbi.getHeight()*aspect);
+							int x = (fbi.getWidth()/2) - (w/2);
+							rect = new Rectangle(x, 0, w, fbi.getHeight());
+						}
+
+						final BufferedImage nbi = ImageUtils.cropImage(fbi, rect);
+
+						File replayFile = ReplayHandler.getReplayFile();
+
+						File folder = new File("./replay_recordings/");
+						folder.mkdirs();
+
+						File temp = File.createTempFile("thumb", null);
+
+						int h = 720;
+						int w = 1280;
+
+						BufferedImage img = ImageUtils.scaleImage(nbi, new Dimension(w, h));
+
+						ImageIO.write(img, "jpg", temp);
+
+						File tempFile = File.createTempFile(replayFile.getName(), null);
+						tempFile.delete(); tempFile.deleteOnExit();
+
+						replayFile.renameTo(tempFile);
+
+						replayFile.delete();
+						replayFile.createNewFile();
+
+						byte[] buf = new byte[1024];
+
+						ZipInputStream zin = new ZipInputStream(new FileInputStream(tempFile));
+						ZipOutputStream zout = new ZipOutputStream(new FileOutputStream(replayFile));
+
+						FileInputStream fis = new FileInputStream(temp);
+
+						ZipEntry entry = zin.getNextEntry();
+						while (entry != null) {
+							String name = entry.getName();
+
+							if(!name.contains("thumb")) {
+								// Add ZIP entry to output stream.
+								zout.putNextEntry(new ZipEntry(name));
+								// Transfer bytes from the ZIP file to the output file
+								int len;
+								while ((len = zin.read(buf)) > 0) {
+									zout.write(buf, 0, len);
+								}
+							} 
+
+							entry = zin.getNextEntry();
+						}
+
+						zout.putNextEntry(new ZipEntry("thumb"));
+						int len;
+						//Add unique bytes to the end of the file
+						zout.write(uniqueBytes);
+
+						while ((len = fis.read(buf)) > 0) {
+							zout.write(buf, 0, len);
+						}
+
+						// Close the streams
+						fis.close();
+						zin.close();
+						// Compress the files
+						// Complete the ZIP file
+						zout.close();
+						tempFile.delete();
+						temp.delete();
+						System.out.println("thumbnail saving finished");
+
+						ChatMessageRequests.addChatMessage("Thumbnail has been successfully saved", ChatMessageType.INFORMATION);
+					} catch(Exception e) {}
+					finally {
+						GuiReplaySaving.replaySaving = false;
+						locked = false;
+					}
+				}
+			});
+
+			ioThread.start();
+		}
+		catch (Exception exception) {
+			mc.gameSettings.hideGUI = before;
+			mc.currentScreen = beforeScreen;
+			ReplayHandler.setSpeed(beforeSpeed);
+			exception.printStackTrace();
+			ChatMessageRequests.addChatMessage("Thumbnail could not be saved", ChatMessageType.WARNING);
+		}
+
+		last_finish = System.currentTimeMillis();
+	}
+
+
+}