Slick Forums

package org.newdawn.slick.tests;

import org.newdawn.slick.*;
import org.newdawn.slick.util.Log;

public class ImageCopyAreaTest extends BasicGame {
   private Image logo;

   private Graphics renderGraphics;
   private Image renderImage;

   // in my real app, we have many of these...
   private Image copiedImage;

   /**
    * Create a new image rendering test
    */
   public ImageCopyAreaTest() {
      super("ImageCopyAreaTest");
   }

   public void init(GameContainer container) throws SlickException {
      logo = new Image("testdata/logo.png");

      try {
         renderImage = new Image(256, 256);
         renderGraphics = renderImage.getGraphics();
      } catch (SlickException e) {
         Log.error("creating local image or graphics context failed: " + e.getMessage());
      }

      copiedImage = new Image(256, 256);

      generate();
   }

   public void generate() {

      Graphics g = renderGraphics;

      g.setColor(Color.pink);
      g.fillRoundRect(0, 0, 256, 256, 15);

      g.drawImage(logo, 0, 0);

      g.flush();
      try {
         copiedImage = new Image(256, 256);

         // add outline. On my machine removing these lines causes the copyArea call to become entirely black.
         // Perhaps some openGL state that is set by the drawRect? No idea.
         g.setColor(new Color(0, 255, 0, 128));
         g.drawRect(0, 0, copiedImage.getWidth() - 1, copiedImage.getHeight() - 1);

         //copy to local image.
         g.copyArea(copiedImage, 0, 0);
         g.flush();
      } catch (SlickException e) {
         e.printStackTrace();
      }

   }

   public void render(GameContainer container, Graphics g) throws SlickException {
      // Draw the one we rendered to, then the copy in a new image.
      g.drawImage(renderImage, 100, 172);
      g.drawImage(copiedImage, 444, 172);
   }

   public static void main(String[] argv) {
      try {
         AppGameContainer container = new AppGameContainer(new ImageCopyAreaTest());
         container.setDisplayMode(800, 600, false);
         container.start();
      } catch (SlickException e) {
         e.printStackTrace();
      }
   }

   public void update(GameContainer container, int delta) throws SlickException {

   }
}

target.bind();
GL.glCopyTexImage2D(SGL.GL_TEXTURE_2D, 0, format, x, screenHeight - (y + target.getHeight()), target.getTexture().getTextureWidth(), target.getTexture().getTextureHeight(), 0);
target.ensureInverted();

public void ensureInverted()
{
    if (textureHeight > 0) {
        textureOffsetY = textureOffsetY + textureHeight;
        textureHeight = -textureHeight;
    }
}