Bitmap: get png encoded data implementation

vtm-android-gdx/src/org/oscim/android/canvas/AndroidBitmap.java

@@ -21,6 +21,7 @@ import android.graphics.BitmapFactory;
 import android.opengl.GLES20;
 import android.opengl.GLUtils;
 
+import java.io.ByteArrayOutputStream;
 import java.io.InputStream;
 
 import static android.graphics.Bitmap.Config.ARGB_8888;
@@ -43,6 +44,13 @@ public class AndroidBitmap implements org.oscim.backend.canvas.Bitmap {
         return mBitmap != null;
     }
 
+    @Override
+    public byte[] getPngEncodedData() {
+        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+        this.mBitmap.compress(Bitmap.CompressFormat.PNG, 0, outputStream);
+        return outputStream.toByteArray();
+    }
+
     /**
      * @param format ignored always ARGB8888
      */

vtm-android/src/org/oscim/android/canvas/AndroidBitmap.java

@@ -21,6 +21,7 @@ import android.graphics.BitmapFactory;
 import android.opengl.GLES20;
 import android.opengl.GLUtils;
 
+import java.io.ByteArrayOutputStream;
 import java.io.InputStream;
 
 import static android.graphics.Bitmap.Config.ARGB_8888;
@@ -43,6 +44,13 @@ public class AndroidBitmap implements org.oscim.backend.canvas.Bitmap {
         return mBitmap != null;
     }
 
+    @Override
+    public byte[] getPngEncodedData(){
+        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+        this.mBitmap.compress(Bitmap.CompressFormat.PNG, 0, outputStream);
+        return outputStream.toByteArray();
+    }
+
     /**
      * @param format ignored always ARGB8888
      */

vtm-desktop/src/org/oscim/awt/AwtBitmap.java

@@ -25,6 +25,7 @@ import org.oscim.backend.canvas.Bitmap;
 import org.oscim.renderer.bucket.TextureBucket;
 
 import java.awt.image.BufferedImage;
+import java.io.ByteArrayOutputStream;
 import java.io.File;
 import java.io.IOException;
 import java.io.InputStream;
@@ -151,4 +152,15 @@ public class AwtBitmap implements Bitmap {
     public boolean isValid() {
         return true;
     }
+
+    @Override
+    public byte[] getPngEncodedData(){
+        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+        try {
+            ImageIO.write(this.bitmap, "png", outputStream);
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        return outputStream.toByteArray();
+    }
 }

vtm-ios/src/org/oscim/ios/backend/IosBitmap.java

@@ -189,6 +189,13 @@ public class IosBitmap implements Bitmap {
         return this.cgBitmapContext != null;
     }
 
+    @Override
+    public byte[] getPngEncodedData() {
+        UIImage uiImage = new UIImage(cgBitmapContext.toImage());
+        NSData data = uiImage.toPNGData();
+        return data.getBytes();
+    }
+
 
     /**
      * Returns a ByteArray from InputStream

vtm/src/org/oscim/backend/canvas/Bitmap.java

@@ -62,4 +62,6 @@ public interface Bitmap {
     void uploadToTexture(boolean replace);
 
     boolean isValid();
+
+    byte[] getPngEncodedData();
 }