com.thematchbox.graphics.ImageOperations Maven / Gradle / Ivy

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This project contains some common utilities used in different projects from theMatchBox.

There is a newer version: 2.0.2

package com.thematchbox.graphics;

/* Copyright 2015 theMatchBox

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/


import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.InputStream;

public class ImageOperations {
    public static BufferedImage resize(InputStream inputStream, Dimension targetDimension) throws IOException {
        BufferedImage image = ImageIO.read(inputStream);
        if (image == null) {
            return null;
        }
        int imageWidth = image.getWidth();
        int imageHeight = image.getHeight();

        double scaleX = (double) targetDimension.width / imageWidth;
        double scaleY = (double) targetDimension.height / imageHeight;

        double scale = Math.min(scaleX, scaleY);

        AffineTransform scaleTransform = AffineTransform.getScaleInstance(scale, scale);
        AffineTransformOp bilinearScaleOp = new AffineTransformOp(scaleTransform, AffineTransformOp.TYPE_BILINEAR);

        int width = (int) (scale * imageWidth);
        int height = (int) (scale * imageHeight);
        return bilinearScaleOp.filter(image, new BufferedImage(width, height, image.getType()));
    }
}