fine-third/fine-iconloader/src/main/java/com/bulenkov/iconloader/RetinaImage.java

/*
 * Copyright 2000-2014 JetBrains s.r.o.
 *
 * 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.
 */

package com.bulenkov.iconloader;

import com.bulenkov.iconloader.util.SystemInfo;
import com.bulenkov.iconloader.util.UIUtil;

import java.awt.*;
import java.awt.image.BufferedImage;
import java.awt.image.ImageObserver;

/**
 * @author Konstantin Bulenkov
 */
public class RetinaImage {

  /**
   * Creates a Retina-aware wrapper over a raw image.
   * The raw image should be provided in scale of the Retina default scale factor (2x).
   * The wrapper will represent the raw image in the user coordinate space.
   *
   * @param image the raw image
   * @return the Retina-aware wrapper
   */
  public static Image createFrom(Image image) {
    return createFrom(image, 2, IconLoader.ourComponent);
  }

  /**
   * Creates a Retina-aware wrapper over a raw image.
   * The raw image should be provided in the specified scale.
   * The wrapper will represent the raw image in the user coordinate space.
   *
   * @param image the raw image
   * @param scale the raw image scale
   * @param observer the raw image observer
   * @return the Retina-aware wrapper
   */
  public static Image createFrom(Image image, final int scale, ImageObserver observer) {
    int w = image.getWidth(observer);
    int h = image.getHeight(observer);

    Image hidpi = create(image, w / scale, h / scale, BufferedImage.TYPE_INT_ARGB);
    if (SystemInfo.isAppleJvm) {
      Graphics2D g = (Graphics2D)hidpi.getGraphics();
      g.scale(1f / scale, 1f / scale);
      g.drawImage(image, 0, 0, null);
      g.dispose();
    }

    return hidpi;
  }

  public static BufferedImage create(final int width, int height, int type) {
    return create(null, width, height, type);
  }


  private static BufferedImage create(Image image, final int width, int height, int type) {
    if (SystemInfo.isAppleJvm) {
      return AppleHiDPIScaledImage.create(width, height, type);
    } else {
      if (image == null) {
        return new JBHiDPIScaledImage(width, height, type);
      } else {
        return new JBHiDPIScaledImage(image, width, height, type);
      }
    }
  }

  public static boolean isAppleHiDPIScaledImage(Image image) {
    return UIUtil.isAppleRetina() && AppleHiDPIScaledImage.is(image);
  }
}