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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);
view.buildDrawingCache();
if (view.getDrawingCache() == null) {
return null;
}
Bitmap snapshot = Bitmap.createBitmap(view.getDrawingCache());
view.setDrawingCacheEnabled(false);
view.destroyDrawingCache();
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);
canvas.drawBitmap(background, 0f, 0f, null);
canvas.drawBitmap(foreground, 10, 10, null);
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);
}
}
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