1 files changed, 87 insertions, 0 deletions
diff --git a/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/utils/BitmapUtils.java b/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/utils/BitmapUtils.java
index e3fc765734..78503f9dfe 100644
--- a/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/utils/BitmapUtils.java
+++ b/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/utils/BitmapUtils.java
@@ -1,12 +1,27 @@
 package com.mapbox.mapboxsdk.utils;
 
+import android.content.Context;
 import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
 import android.graphics.Canvas;
+import android.graphics.drawable.BitmapDrawable;
+import android.graphics.drawable.Drawable;
 import android.support.annotation.NonNull;
 import android.view.View;
 
+import java.io.ByteArrayOutputStream;
+
+/**
+ * Utility class for creating bitmaps
+ */
 public class BitmapUtils {
 
+  /**
+   * Convert a view to a bitmap.
+   *
+   * @param view the view to convert
+   * @return the converted bitmap
+   */
   public static Bitmap createBitmapFromView(@NonNull View view) {
     view.setDrawingCacheEnabled(true);
     view.setDrawingCacheQuality(View.DRAWING_CACHE_QUALITY_LOW);
@@ -22,6 +37,13 @@ public class BitmapUtils {
     return snapshot;
   }
 
+  /**
+   * Create a bitmap from a background and a foreground bitmap
+   *
+   * @param background The bitmap placed in the background
+   * @param foreground The bitmap placed in the foreground
+   * @return the merged bitmap
+   */
   public static Bitmap mergeBitmap(@NonNull Bitmap background, @NonNull Bitmap foreground) {
     Bitmap result = Bitmap.createBitmap(background.getWidth(), background.getHeight(), background.getConfig());
     Canvas canvas = new Canvas(result);
@@ -30,4 +52,69 @@ public class BitmapUtils {
     return result;
   }
 
+  /**
+   * Extract an underlying bitmap from a drawable
+   *
+   * @param sourceDrawable The source drawable
+   * @return The underlying bitmap
+   */
+  public static Bitmap getBitmapFromDrawable(Drawable sourceDrawable) {
+    if (sourceDrawable == null) {
+      return null;
+    }
+
+    if (sourceDrawable instanceof BitmapDrawable) {
+      return ((BitmapDrawable) sourceDrawable).getBitmap();
+    } else {
+      //copying drawable object to not manipulate on the same reference
+      Drawable.ConstantState constantState = sourceDrawable.getConstantState();
+      if (constantState == null) {
+        return null;
+      }
+      Drawable drawable = constantState.newDrawable().mutate();
+
+      Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(),
+        Bitmap.Config.ARGB_8888);
+      Canvas canvas = new Canvas(bitmap);
+      drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
+      drawable.draw(canvas);
+      return bitmap;
+    }
+  }
+
+  /**
+   * Create a byte array out of drawable
+   *
+   * @param drawable The source drawable
+   * @return The byte array of source drawable
+   */
+  public static byte[] getByteArrayFromDrawable(Drawable drawable) {
+    if (drawable == null) {
+      return null;
+    }
+
+    Bitmap bitmap = getBitmapFromDrawable(drawable);
+    if (bitmap == null) {
+      return null;
+    }
+    ByteArrayOutputStream stream = new ByteArrayOutputStream();
+    bitmap.compress(Bitmap.CompressFormat.PNG, 100, stream);
+    return stream.toByteArray();
+  }
+
+  /**
+   * Decode byte array to drawable object
+   *
+   * @param context Context to obtain {@link android.content.res.Resources}
+   * @param array   The source byte array
+   * @return The drawable created from source byte array
+   */
+  public static Drawable getDrawableFromByteArray(Context context, byte[] array) {
+    if (array == null) {
+      return null;
+    }
+    Bitmap compass = BitmapFactory.decodeByteArray(array, 0, array.length);
+    return new BitmapDrawable(context.getResources(), compass);
+  }
+
 }