ColorTransformation.java

package com.ptrprograms.iconcolorization.utility;

import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.PorterDuff;
import android.graphics.drawable.BitmapDrawable;
import com.squareup.picasso.Transformation;

/**
 * Created by paulruiz on 8/22/14.
 */
public class ColorTransformation implements Transformation {

    private int color = 0;

    public ColorTransformation() {

    }

    public ColorTransformation( int color ) {
        setColor( color );
    }

    public void setColor( int color ) {
        this.color = color;
    }

    public void setColorFromRes( Context context, int colorResId ) {
        setColor( context.getResources().getColor( colorResId ) );
    }

    public int getColor() {
        return color;
    }

    @Override
    public Bitmap transform(Bitmap source) {
        if( color == 0 ) {
            return source;
        }

        BitmapDrawable drawable = new BitmapDrawable(Resources.getSystem(), source );
        Bitmap result = Bitmap.createBitmap( drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888 );
        Canvas canvas = new Canvas( result );
        drawable.setBounds( 0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight() );
        drawable.setColorFilter( color, PorterDuff.Mode.SRC_IN );
        drawable.draw(canvas);
        drawable.setColorFilter(null);
        drawable.setCallback(null);

        if( result != source ) {
            source.recycle();
        }

        return result;
    }

    @Override
    public String key() {
        return "DrawableColor:" + color;
    }
}