import java.util.*; import java.util.zip.*; import java.util.List; import java.util.regex.*; import java.util.concurrent.*; import java.util.concurrent.atomic.*; import java.util.concurrent.locks.*; import java.util.function.*; import javax.swing.*; import javax.swing.event.*; import javax.swing.text.*; import javax.swing.table.*; import java.io.*; import java.net.*; import java.lang.reflect.*; import java.lang.ref.*; import java.lang.management.*; import java.security.*; import java.security.spec.*; import java.awt.*; import java.awt.event.*; import java.awt.image.*; import java.awt.geom.*; import javax.imageio.*; import java.math.*; class main { static BufferedImage imageFromFunctionWithoutAlpha(int w, IF2_Int f) { return imageFromFunctionWithoutAlpha(w, w, f); } static BufferedImage imageFromFunctionWithoutAlpha(int w, int h, IF2_Int f) { int[] pixels = new int[w*h]; int i = 0; for (int y = 0; y < h; y++) for (int x = 0; x < w; x++) pixels[i++] = f.get(x, y); return intArrayToBufferedImageWithoutAlpha(pixels, w, h); } // from: https://stackoverflow.com/questions/14416107/int-array-to-bufferedimage // pixels are RGB pixels static BufferedImage intArrayToBufferedImageWithoutAlpha(int[] pixels, int w, int h) { int[] bitMasks = {0xFF0000, 0xFF00, 0xFF}; SinglePixelPackedSampleModel sm = new SinglePixelPackedSampleModel(DataBuffer.TYPE_INT, w, h, bitMasks); DataBufferInt db = new DataBufferInt(pixels, pixels.length); WritableRaster wr = Raster.createWritableRaster(sm, db, new Point()); DirectColorModel cm = new DirectColorModel (24, bitMasks[0], bitMasks[1], bitMasks[2], 0); return new BufferedImage(cm, wr, false, null); } static interface IF2_Int { int get(int a, int b); } }