GraphicsUtilities.java

package minizoo.c.filter;

import java.awt.image.BufferedImage;
import java.awt.image.Raster;
import java.awt.image.WritableRaster;

public class GraphicsUtilities {
    public static int[] getPixels(BufferedImage img,
                                  int x, int y,
                                  int w, int h,
                                  int[] pixels) {
        if (w == 0 || h == 0) {
            return new int[0];
        }
        if (pixels == null) {
            pixels = new int[w * h];
        } else if (pixels.length < w * h) {
            throw new IllegalArgumentException(
                    "pixels array must have a length >= w*h");
        }

        int imageType = img.getType();
        if (imageType == BufferedImage.TYPE_INT_ARGB ||
                imageType == BufferedImage.TYPE_INT_RGB) {
            Raster raster = img.getRaster();
            return (int[]) raster.getDataElements(x, y, w, h, pixels);
        }

        return img.getRGB(x, y, w, h, pixels, 0, w);
    }

    public static void setPixels(BufferedImage img,
                                 int x, int y,
                                 int w, int h,
                                 int[] pixels) {
        if (pixels == null || w == 0 || h == 0) {
            return;
        } else if (pixels.length < w * h) {
            throw new IllegalArgumentException(
                    "pixels array must have a length >= w*h");
        }

        int imageType = img.getType();
        if (imageType == BufferedImage.TYPE_INT_ARGB ||
                imageType == BufferedImage.TYPE_INT_RGB) {
            WritableRaster raster = img.getRaster();
            raster.setDataElements(x, y, w, h, pixels);
        } else {
            img.setRGB(x, y, w, h, pixels, 0, w);
        }
    }
}