Java Utililty Methods ByteBuffer Size

BufferedImage adaptImageSize(final BufferedImage img, final int width, final int height)
Creates a new image with a changed image size if it doesn't match the given width and height

if (img.getWidth() != width || img.getHeight() != height) {
 return increaseImageSize(img, width, height);
return img;

void addToStringBuilder(StringBuilder sb, ByteBuffer buffer, int size)
add To String Builder

byte[] array = new byte[size];
for (int i = 0; i < size; i++) {
 array[i] = buffer.get(i);
final String message = new String(array);
sb.append(message);

long calcSize(ByteBuffer buffer)
calc Size

return buffer.limit() - buffer.position();

ByteBuffer check(ByteBuffer buffer, int size)
Check if the buffer has the remaining capacity to hold the number of bytes.

if (buffer == null) {
 ByteBuffer newBuffer = ByteBuffer.allocate(size);
 newBuffer.mark();
 return newBuffer;
if (buffer.remaining() < size) {
 int position = buffer.position();
 ByteBuffer newBuffer = ByteBuffer.allocate(position + size + 1);
...

void checkBounds(BufferedImage image, int xStart, int yStart, int width, int height)
check Bounds

int imgWidth = image.getWidth();
int imgHeight = image.getHeight();
if (xStart > imgWidth || width > imgWidth || (xStart + width) > imgWidth) {
 throw new RuntimeException("image does not fully contain the comparison region");
if (yStart > imgHeight || height > imgHeight || (yStart + height) > imgHeight) {
 throw new RuntimeException("image does not fully contain the comparison region");

void checkBufferSize(ByteBuffer buf, int elementSize)
check Buffer Size

if (buf.remaining() < elementSize) {
 throw new Exception("Malformed packet: insufficient buffer data");

int chooseAppropriateTileSize(BufferedImage image)
choose Appropriate Tile Size

int width = image.getWidth();
int height = image.getHeight();
int tileSize = (int) (Math.sqrt(Math.sqrt(width * height)) * 1.5);
return tileSize;

boolean collidesWithImage(BufferedImage image, int x, int y, int width, int height, boolean pixelPerfect)
collides With Image

if (x > 0 && x < width) {
 if (y > 0 && y < height) {
 if (pixelPerfect == true) {
 double widthGrad = ((double) image.getWidth()) / ((double) width);
 double heightGrad = ((double) image.getHeight()) / ((double) height);
 int pixelX = (int) (((double) x) * widthGrad);
 int pixelY = (int) (((double) y) * heightGrad);
 int pixel = image.getRGB(pixelX, pixelY);
...

BufferedImage convolve(final BufferedImage image, float[] elements, int theWidth, int theHeight)
convolve

Kernel kernel = new Kernel(theWidth, theHeight, elements);
ConvolveOp op = new ConvolveOp(kernel, ConvolveOp.EDGE_NO_OP, null);
return filter(image, op);

void cover(BufferedImage source, File to, Image cover, int width, int height, int sourceTop, int sourceLeft, int sourceWidth, int sourceHeight)
cover

BufferedImage dest = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Image imageSource = source.getScaledInstance(sourceWidth, sourceHeight, Image.SCALE_SMOOTH);
Graphics graphics = dest.getGraphics();
graphics.setColor(new Color(225, 225, 225));
graphics.fillRect(0, 0, width, height);
graphics.drawImage(imageSource, sourceTop, sourceLeft, null);
graphics.drawImage(cover, 0, 0, null);
String mimeType = "image/jpeg";
...