multipacker like in mindustry

utils/files/src/arclibrary/utils/graphics/MultiPacker.java

@@ -0,0 +1,82 @@
+package arclibrary.utils.graphics;
+
+import arc.graphics.*;
+import arc.graphics.Texture.*;
+import arc.graphics.g2d.*;
+import arc.struct.*;
+import arc.util.*;
+
+/** Stores pixmaps in different pages. **/
+public class MultiPacker implements Disposable{
+    public ObjectMap<String, PixmapPacker> packersMap = new ObjectMap<>();
+    public Seq<PixmapPacker> packers = new Seq<>();
+
+    /** @param page page name
+     *  @return packer which this page attached
+     **/
+    public PixmapPacker get(String page) {
+        PixmapPacker out = packersMap.get(page);
+        if (out == null) {
+            out = new PixmapPacker(8192, 8192, 2, false);
+            packersMap.put(page, out);
+            packers.add(out);
+        }
+        return out;
+    }
+
+    /** @param page page name
+     *  @param name pixmap region name
+     *  @param region pixmap region
+     **/
+    public void add(String page, String name, PixmapRegion region){
+        add(page, name, region, null, null);
+    }
+
+    /** @param page page name
+     *  @param name pixmap region name
+     *  @param region pixmap region
+     *  @param splits splits
+     *  @param pads paddings
+     **/
+    public void add(String page, String name, PixmapRegion region, int[] splits, int[] pads){
+        get(page).pack(name, region, splits, pads);
+    }
+
+    /** @param page page name
+     *  @param name pixmap name
+     *  @param pix pixmap
+     **/
+    public void add(String page, String name, Pixmap pix){
+        add(page, name, new PixmapRegion(pix));
+    }
+
+    /**
+     * Generates new atlas with loaded pages.
+     * @param filter texture filter for new atlas
+     * @return new texture atlas
+     **/
+    public TextureAtlas flush(TextureFilter filter){
+        TextureAtlas atlas = new TextureAtlas();
+        flush(atlas, filter);
+        return atlas;
+    }
+
+    /**
+     * Updates atlas with loaded pages.
+     * @param atlas atlas for update
+     * @param filter texture filter for new atlas
+     **/
+    public void flush(TextureAtlas atlas, TextureFilter filter){
+        for(PixmapPacker p : packers){
+            p.updateTextureAtlas(atlas, filter, filter, false, false);
+        }
+    }
+
+    /** Call it after flush. **/
+    @Override
+    public void dispose(){
+        for(PixmapPacker packer : packers){
+            packer.dispose();
+        }
+    }
+}