Android Open Source - slider Bitmap Caching Piece Drawer

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License

The source code is released under:

Apache License

Java Source Code

package de.devisnik.android.sliding.tile;
/*from  ww w .  j  a v a  2  s .  c  o m*/
import java.util.HashMap;

import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Bitmap.Config;
import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;
import de.devisnik.sliding.IPiece;
import de.devisnik.sliding.Point;

public class BitmapCachingPieceDrawer implements IPieceDrawer {

  private final IPieceDrawer itsTileDrawer;
  private final HashMap<IPiece, Bitmap> itsCache = new HashMap<IPiece, Bitmap>();
  private final Paint mPaint;

  public BitmapCachingPieceDrawer(final IPieceDrawer tileDrawer) {
    itsTileDrawer = tileDrawer;
    mPaint = new Paint();
    mPaint.setXfermode(new PorterDuffXfermode(Mode.SCREEN));
  }

  @Override
  public Point getTileSize() {
    return itsTileDrawer.getTileSize();
  }

  @Override
  public void drawTile(final IPiece piece, final Canvas canvas, final Paint paint) {
    Bitmap bitmap = itsCache.get(piece);
    if (bitmap == null)
      bitmap = cacheBitmap(piece, null);
    canvas.drawBitmap(bitmap, 0f, 0f, mPaint);
  }

  private Bitmap cacheBitmap(final IPiece piece, final Paint paint) {
    Point tileSize = itsTileDrawer.getTileSize();
    Bitmap bitmap = Bitmap.createBitmap(tileSize.x, tileSize.y, Config.ARGB_8888);
    Canvas canvas = new Canvas(bitmap);
    itsTileDrawer.drawTile(piece, canvas, paint);
    itsCache.put(piece, bitmap);
    return bitmap;
  }

}

Java Source Code List

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