--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/javauis/lcdui_qt/src/javax/microedition/lcdui/game/Layer.java	Mon May 03 12:27:20 2010 +0300
@@ -0,0 +1,143 @@
+/*
+* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description: 
+*
+*/
+package javax.microedition.lcdui.game;
+
+import javax.microedition.lcdui.Graphics;
+import javax.microedition.lcdui.Image;
+
+/**
+ * LCDUI Layer class.
+ */
+public abstract class Layer {
+
+    int x;
+    int y;
+    boolean visible;
+
+    Image tileImage;
+
+    int tileWidth;
+    int tileHeight;
+
+    int tileCount;
+    int tileColumns;
+
+    /**
+     * Package level constructor prevents Layer being subclassed. This is
+     * consistent with the MIDP 2.0 RI.
+     */
+    Layer(Image tileImage, int frameWidth, int frameHeight) {
+        visible = true;
+        setTileImage(tileImage, frameWidth, frameHeight);
+    }
+
+    Layer(Layer from) {
+        x = from.x;
+        y = from.y;
+        visible = from.visible;
+        tileImage = from.tileImage;
+        tileWidth = from.tileWidth;
+        tileHeight = from.tileHeight;
+        tileCount = from.tileCount;
+        tileColumns = from.tileColumns;
+    }
+
+    public void setPosition(int x, int y) {
+        this.x = x;
+        this.y = y;
+    }
+
+    public void move(int deltaX, int deltaY) {
+        x += deltaX;
+        y += deltaY;
+    }
+
+    public final int getX() {
+        return x;
+    }
+
+    public final int getY() {
+        return y;
+    }
+
+    public final int getWidth() {
+        return getLayerWidth();
+    }
+
+    public final int getHeight() {
+        return getLayerHeight();
+    }
+
+    public void setVisible(boolean visible) {
+        this.visible = visible;
+    }
+
+    public final boolean isVisible() {
+        return visible;
+    }
+
+    public abstract void paint(Graphics graphics);
+
+    abstract int getLayerWidth();
+
+    abstract int getLayerHeight();
+
+    /**
+     * Set the source image and tile size. checks that the image is completely
+     * tiled. computes the tile count.
+     */
+    void setTileImage(Image tileImage, int tileWidth, int tileHeight) {
+        if (tileWidth > 0 && tileHeight > 0) {
+            final int imageWidth = tileImage.getWidth();
+            final int imageHeight = tileImage.getHeight();
+
+            int rows = imageHeight / tileHeight;
+            int cols = imageWidth / tileWidth;
+
+            int totalHeight = rows * tileHeight;
+            int totalWidth = cols * tileWidth;
+
+            if (totalHeight == imageHeight && totalWidth == imageWidth) {
+                this.tileImage = tileImage;
+                this.tileWidth = tileWidth;
+                this.tileHeight = tileHeight;
+                this.tileCount = rows * cols;
+                this.tileColumns = cols;
+                return;
+            }
+        }
+        throw new IllegalArgumentException(
+                MsgRepository.LAYER_EXCEPTION_INVALID_TILE_WIDTH_HEIGHT);
+    }
+
+    /**
+     * Is Layer visible in Graphics clip region.
+     */
+    final boolean isVisible(Graphics graphics, int pX, int pY) {
+        int x1 = x + pX;
+        int y1 = y + pY;
+        int x2 = x1 + getWidth();
+        int y2 = y1 + getHeight();
+        int clipX1 = graphics.getClipX();
+        int clipY1 = graphics.getClipY();
+        int clipX2 = clipX1 + graphics.getClipWidth();
+        int clipY2 = clipY1 + graphics.getClipHeight();
+
+        return !(clipX2 <= x1 || clipY2 <= y1 || clipX1 >= x2 || clipY1 >= y2);
+    }
+
+}