Method pixelSorting

examples/scenes/src/BitmapImageScene.java:114–139

(Canvas canvas, ByteBuffer pixels, ImageInfo info)

    }

    public void pixelSorting(Canvas canvas, ByteBuffer pixels, ImageInfo info) {
        var threshold = 100 + phase() * 100;
        // var threshold = 0.4f + phase() * 0.4f;
        var colorType = info.getColorType();
        Comparator<Integer> cmp = (a, b) -> Float.compare(luminocity(colorType, a), luminocity(colorType, b));
        for (int x = 0; x < info.getWidth(); ++x) {
            // read pixels
            Integer column[] = new Integer[info.getHeight()];
            for (int y = 0; y < info.getHeight(); ++y)
                column[y] = pixels.getInt((y * info.getWidth() + x) * info.getBytesPerPixel());  // Assume RGBA_8888

            // sort pixels
            var lastIdx = 0;
            for (int y = 0; y < info.getHeight() - 1; ++y) {
                if (Math.abs(luminocity(colorType, column[y]) - luminocity(colorType, column[y + 1])) > threshold) {
                    Arrays.parallelSort(column, lastIdx, y, cmp);
                    lastIdx = y;
                }
            }
            Arrays.parallelSort(column, lastIdx, info.getHeight(), cmp);

            // write pixels
            for (int y = 0; y < info.getHeight(); ++y)
                pixels.putInt((y * info.getWidth() + x)  * info.getBytesPerPixel(), column[y]);
        }
    }
}