下面列出了怎么用java.awt.image.DataBufferByte的API类实例代码及写法，或者点击链接到github查看源代码。
/**
* Extracts image pixels into byte array "pixels"
*/
protected void getImagePixels() {
int w = image.getWidth();
int h = image.getHeight();
int type = image.getType();
if ((w != width)
|| (h != height)
|| (type != BufferedImage.TYPE_3BYTE_BGR)) {
// create new image with right size/format
BufferedImage temp =
new BufferedImage(width, height, BufferedImage.TYPE_3BYTE_BGR);
Graphics2D g = temp.createGraphics();
g.drawImage(image, 0, 0, null);
image = temp;
}
pixels = ((DataBufferByte) image.getRaster().getDataBuffer()).getData();
}
/**
* Converts <code>BufferedImage</code> to <code>ByteBuffer</code>.
*
* @param bi Input image
* @return pixel data
*/
public static ByteBuffer convertImageData(BufferedImage bi) {
DataBuffer buff = bi.getRaster().getDataBuffer();
// ClassCastException thrown if buff not instanceof DataBufferByte because raster data is not necessarily bytes.
// Convert the original buffered image to grayscale.
if (!(buff instanceof DataBufferByte)) {
BufferedImage grayscaleImage = ImageHelper.convertImageToGrayscale(bi);
buff = grayscaleImage.getRaster().getDataBuffer();
}
byte[] pixelData = ((DataBufferByte) buff).getData();
// return ByteBuffer.wrap(pixelData);
ByteBuffer buf = ByteBuffer.allocateDirect(pixelData.length);
buf.order(ByteOrder.nativeOrder());
buf.put(pixelData);
((Buffer) buf).flip();
return buf;
}
private static BufferedImage makeUnmanagedBI(GraphicsConfiguration gc,
int type) {
BufferedImage img = gc.createCompatibleImage(SIZE, SIZE, type);
Graphics2D g2d = img.createGraphics();
g2d.setColor(RGB);
g2d.fillRect(0, 0, SIZE, SIZE);
g2d.dispose();
final DataBuffer db = img.getRaster().getDataBuffer();
if (db instanceof DataBufferInt) {
((DataBufferInt) db).getData();
} else if (db instanceof DataBufferShort) {
((DataBufferShort) db).getData();
} else if (db instanceof DataBufferByte) {
((DataBufferByte) db).getData();
} else {
try {
img.setAccelerationPriority(0.0f);
} catch (final Throwable ignored) {
}
}
return img;
}
private static BufferedImage makeUnmanagedBI(GraphicsConfiguration gc,
int type) {
BufferedImage img = gc.createCompatibleImage(SIZE, SIZE, type);
Graphics2D g2d = img.createGraphics();
g2d.setColor(RGB);
g2d.fillRect(0, 0, SIZE, SIZE);
g2d.dispose();
final DataBuffer db = img.getRaster().getDataBuffer();
if (db instanceof DataBufferInt) {
((DataBufferInt) db).getData();
} else if (db instanceof DataBufferShort) {
((DataBufferShort) db).getData();
} else if (db instanceof DataBufferByte) {
((DataBufferByte) db).getData();
} else {
try {
img.setAccelerationPriority(0.0f);
} catch (final Throwable ignored) {
}
}
return img;
}
public Image makeImage(TestEnvironment env, int w, int h) {
BufferedImage img = new BufferedImage(w, h, type);
if (unmanaged) {
DataBuffer db = img.getRaster().getDataBuffer();
if (db instanceof DataBufferInt) {
((DataBufferInt)db).getData();
} else if (db instanceof DataBufferShort) {
((DataBufferShort)db).getData();
} else if (db instanceof DataBufferByte) {
((DataBufferByte)db).getData();
} else {
try {
img.setAccelerationPriority(0.0f);
} catch (Throwable e) {}
}
}
return img;
}
private static BufferedImage makeUnmanagedBI(GraphicsConfiguration gc,
int type) {
BufferedImage img = gc.createCompatibleImage(SIZE, SIZE, type);
Graphics2D g2d = img.createGraphics();
g2d.setColor(RGB);
g2d.fillRect(0, 0, SIZE, SIZE);
g2d.dispose();
final DataBuffer db = img.getRaster().getDataBuffer();
if (db instanceof DataBufferInt) {
((DataBufferInt) db).getData();
} else if (db instanceof DataBufferShort) {
((DataBufferShort) db).getData();
} else if (db instanceof DataBufferByte) {
((DataBufferByte) db).getData();
} else {
try {
img.setAccelerationPriority(0.0f);
} catch (final Throwable ignored) {
}
}
return img;
}
private static BufferedImage makeUnmanagedBI(final int type) {
final BufferedImage img = new BufferedImage(SIZE, SIZE, type);
final DataBuffer db = img.getRaster().getDataBuffer();
if (db instanceof DataBufferInt) {
((DataBufferInt) db).getData();
} else if (db instanceof DataBufferShort) {
((DataBufferShort) db).getData();
} else if (db instanceof DataBufferByte) {
((DataBufferByte) db).getData();
} else {
try {
img.setAccelerationPriority(0.0f);
} catch (final Throwable ignored) {
}
}
return img;
}
private static BufferedImage makeUnmanagedBI(GraphicsConfiguration gc,
int type) {
BufferedImage img = gc.createCompatibleImage(SIZE, SIZE, type);
Graphics2D g2d = img.createGraphics();
g2d.setColor(RGB);
g2d.fillRect(0, 0, SIZE, SIZE);
g2d.dispose();
final DataBuffer db = img.getRaster().getDataBuffer();
if (db instanceof DataBufferInt) {
((DataBufferInt) db).getData();
} else if (db instanceof DataBufferShort) {
((DataBufferShort) db).getData();
} else if (db instanceof DataBufferByte) {
((DataBufferByte) db).getData();
} else {
try {
img.setAccelerationPriority(0.0f);
} catch (final Throwable ignored) {
}
}
return img;
}
private static BufferedImage makeUnmanagedBI(final int type) {
final BufferedImage img = new BufferedImage(SIZE, SIZE, type);
final DataBuffer db = img.getRaster().getDataBuffer();
if (db instanceof DataBufferInt) {
((DataBufferInt) db).getData();
} else if (db instanceof DataBufferShort) {
((DataBufferShort) db).getData();
} else if (db instanceof DataBufferByte) {
((DataBufferByte) db).getData();
} else {
try {
img.setAccelerationPriority(0.0f);
} catch (final Throwable ignored) {
}
}
return img;
}
private static BufferedImage makeUnmanagedBI() {
final BufferedImage bi = new BufferedImage(500, 200, TYPE_INT_ARGB);
final DataBuffer db = bi.getRaster().getDataBuffer();
if (db instanceof DataBufferInt) {
((DataBufferInt) db).getData();
} else if (db instanceof DataBufferShort) {
((DataBufferShort) db).getData();
} else if (db instanceof DataBufferByte) {
((DataBufferByte) db).getData();
} else {
try {
bi.setAccelerationPriority(0.0f);
} catch (final Throwable ignored) {
}
}
return bi;
}
/**
* Load a rastered image from file
*
* @param file the file to load
* @return the rastered image
* @throws IOException
*/
public int[][][] fromFileMultipleChannels(File file) throws IOException {
BufferedImage image = ImageIO.read(file);
image = scalingIfNeed(image, channels > 3);
int w = image.getWidth(), h = image.getHeight();
int bands = image.getSampleModel().getNumBands();
int[][][] ret = new int[(int) Math.min(channels, Integer.MAX_VALUE)]
[(int) Math.min(h, Integer.MAX_VALUE)]
[(int) Math.min(w, Integer.MAX_VALUE)];
byte[] pixels = ((DataBufferByte) image.getRaster().getDataBuffer()).getData();
for (int i = 0; i < h; i++) {
for (int j = 0; j < w; j++) {
for (int k = 0; k < channels; k++) {
if (k >= bands)
break;
ret[k][i][j] = pixels[(int) Math.min(channels * w * i + channels * j + k, Integer.MAX_VALUE)];
}
}
}
return ret;
}
public Image makeImage(TestEnvironment env, int w, int h) {
BufferedImage img = new BufferedImage(w, h, type);
if (unmanaged) {
DataBuffer db = img.getRaster().getDataBuffer();
if (db instanceof DataBufferInt) {
((DataBufferInt)db).getData();
} else if (db instanceof DataBufferShort) {
((DataBufferShort)db).getData();
} else if (db instanceof DataBufferByte) {
((DataBufferByte)db).getData();
} else {
try {
img.setAccelerationPriority(0.0f);
} catch (Throwable e) {}
}
}
return img;
}
/**
* Flip vertically the image
*
* @param image the image containing the pixel data which has to be flipped
* vertically. This function will alter the bytes of input image, so that
* after this function the input image will contain the flipped information
*/
public static void flipVerticallyImage(BufferedImage image) {
byte[] bgr = ((DataBufferByte) image.getRaster().getDataBuffer()).getData();
byte[] flipped = new byte[bgr.length];
final int multiplier = 3; // BGR
for (int j = 0; j < image.getHeight(); j++) {
for (int i = 0; i < image.getWidth(); i++) {
flipped[((image.getHeight() - 1) - j) * (image.getWidth() * multiplier) + (i * multiplier + 0)] = bgr[(j * (image.getWidth() * multiplier)) + (i * multiplier + 0)]; // R
flipped[((image.getHeight() - 1) - j) * (image.getWidth() * multiplier) + (i * multiplier + 1)] = bgr[(j * (image.getWidth() * multiplier)) + (i * multiplier + 1)]; // G
flipped[((image.getHeight() - 1) - j) * (image.getWidth() * multiplier) + (i * multiplier + 2)] = bgr[(j * (image.getWidth() * multiplier)) + (i * multiplier + 2)]; // B
}
}
System.arraycopy(flipped, 0, bgr, 0, image.getWidth() * image.getHeight() * multiplier);
}
private static BufferedImage makeUnmanagedBI() {
final BufferedImage bi = new BufferedImage(500, 200, TYPE_INT_ARGB);
final DataBuffer db = bi.getRaster().getDataBuffer();
if (db instanceof DataBufferInt) {
((DataBufferInt) db).getData();
} else if (db instanceof DataBufferShort) {
((DataBufferShort) db).getData();
} else if (db instanceof DataBufferByte) {
((DataBufferByte) db).getData();
} else {
try {
bi.setAccelerationPriority(0.0f);
} catch (final Throwable ignored) {
}
}
return bi;
}
public static Mat drawNonAscii(String watermark) {
Font font = new Font("Default", Font.PLAIN, 64);
FontMetrics metrics = new Canvas().getFontMetrics(font);
int width = metrics.stringWidth(watermark);
int height = metrics.getHeight();
BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_BYTE_GRAY);
Graphics2D graphics = bufferedImage.createGraphics();
graphics.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
graphics.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER));
graphics.setFont(font);
graphics.setColor(Color.WHITE);
graphics.drawString(watermark, 0, metrics.getAscent());
graphics.dispose();
byte[] pixels = ((DataBufferByte) bufferedImage.getRaster().getDataBuffer()).getData();
Mat res = new Mat(bufferedImage.getHeight(), bufferedImage.getWidth(), CV_8U);
res.put(0, 0, pixels);
return res;
}
private static BufferedImage makeUnmanagedBI(GraphicsConfiguration gc,
int type) {
BufferedImage img = gc.createCompatibleImage(SIZE, SIZE, type);
Graphics2D g2d = img.createGraphics();
g2d.setColor(RGB);
g2d.fillRect(0, 0, SIZE, SIZE);
g2d.dispose();
final DataBuffer db = img.getRaster().getDataBuffer();
if (db instanceof DataBufferInt) {
((DataBufferInt) db).getData();
} else if (db instanceof DataBufferShort) {
((DataBufferShort) db).getData();
} else if (db instanceof DataBufferByte) {
((DataBufferByte) db).getData();
} else {
try {
img.setAccelerationPriority(0.0f);
} catch (final Throwable ignored) {
}
}
return img;
}
/**
* Take a screenshot and return it as an Img
* @return an Img of type UnsignedByteType
*/
public Img<UnsignedByteType> getScreenshot() {
RenderedImage screenshot = getSceneryRenderer().requestScreenshot();
BufferedImage image = new BufferedImage(screenshot.getWidth(), screenshot.getHeight(), BufferedImage.TYPE_4BYTE_ABGR);
byte[] imgData = ((DataBufferByte) image.getRaster().getDataBuffer()).getData();
System.arraycopy(screenshot.getData(), 0, imgData, 0, screenshot.getData().length);
Img<UnsignedByteType> img = null;
File tmpFile = null;
try {
tmpFile = File.createTempFile("sciview-", "-tmp.png");
ImageIO.write(image, "png", tmpFile);
img = (Img<UnsignedByteType>)io.open(tmpFile.getAbsolutePath());
tmpFile.delete();
} catch (IOException e) {
e.printStackTrace();
}
return img;
}
/**
* Extracts image pixels into byte array "pixels"
*/
protected void getImagePixels() {
int w = image.getWidth();
int h = image.getHeight();
int type = image.getType();
if ((w != width) || (h != height)
|| (type != BufferedImage.TYPE_3BYTE_BGR)) {
// create new image with right size/format
BufferedImage temp = new BufferedImage(width, height,
BufferedImage.TYPE_3BYTE_BGR);
Graphics2D g = temp.createGraphics();
g.drawImage(image, 0, 0, null);
image = temp;
}
pixels = ((DataBufferByte) image.getRaster().getDataBuffer()).getData();
}
public Image makeImage(TestEnvironment env, int w, int h) {
BufferedImage img = new BufferedImage(w, h, type);
if (unmanaged) {
DataBuffer db = img.getRaster().getDataBuffer();
if (db instanceof DataBufferInt) {
((DataBufferInt)db).getData();
} else if (db instanceof DataBufferShort) {
((DataBufferShort)db).getData();
} else if (db instanceof DataBufferByte) {
((DataBufferByte)db).getData();
} else {
try {
img.setAccelerationPriority(0.0f);
} catch (Throwable e) {}
}
}
return img;
}
/** Extracts pixel data as arrays of unsigned bytes, one per channel. */
public static byte[][] getBytes(final WritableRaster r, final int x,
final int y, final int w, final int h)
{
if (canUseBankDataDirectly(r, DataBuffer.TYPE_BYTE, DataBufferByte.class) &&
x == 0 && y == 0 && w == r.getWidth() && h == r.getHeight())
{
return ((DataBufferByte) r.getDataBuffer()).getBankData();
}
final int c = r.getNumBands();
final byte[][] samples = new byte[c][w * h];
final int[] buf = new int[w * h];
for (int i = 0; i < c; i++) {
r.getSamples(x, y, w, h, i, buf);
for (int j = 0; j < buf.length; j++)
samples[i][j] = (byte) buf[j];
}
return samples;
}
public Image makeImage(TestEnvironment env, int w, int h) {
BufferedImage img = new BufferedImage(w, h, type);
if (unmanaged) {
DataBuffer db = img.getRaster().getDataBuffer();
if (db instanceof DataBufferInt) {
((DataBufferInt)db).getData();
} else if (db instanceof DataBufferShort) {
((DataBufferShort)db).getData();
} else if (db instanceof DataBufferByte) {
((DataBufferByte)db).getData();
} else {
try {
img.setAccelerationPriority(0.0f);
} catch (Throwable e) {}
}
}
return img;
}
public Image makeImage(TestEnvironment env, int w, int h) {
BufferedImage img = new BufferedImage(w, h, type);
if (unmanaged) {
DataBuffer db = img.getRaster().getDataBuffer();
if (db instanceof DataBufferInt) {
((DataBufferInt)db).getData();
} else if (db instanceof DataBufferShort) {
((DataBufferShort)db).getData();
} else if (db instanceof DataBufferByte) {
((DataBufferByte)db).getData();
} else {
try {
img.setAccelerationPriority(0.0f);
} catch (Throwable e) {}
}
}
return img;
}
/**
* Extracts image pixels into byte array "pixels"
*/
protected void getImagePixels() {
int w = image.getWidth();
int h = image.getHeight();
int type = image.getType();
if ((w != width)
|| (h != height)
|| (type != BufferedImage.TYPE_3BYTE_BGR)) {
// create new image with right size/format
BufferedImage temp =
new BufferedImage(width, height, BufferedImage.TYPE_3BYTE_BGR);
Graphics2D g = temp.createGraphics();
g.drawImage(image, 0, 0, null);
image = temp;
}
pixels = ((DataBufferByte) image.getRaster().getDataBuffer()).getData();
}
public Image makeImage(TestEnvironment env, int w, int h) {
BufferedImage img = new BufferedImage(w, h, type);
if (unmanaged) {
DataBuffer db = img.getRaster().getDataBuffer();
if (db instanceof DataBufferInt) {
((DataBufferInt)db).getData();
} else if (db instanceof DataBufferShort) {
((DataBufferShort)db).getData();
} else if (db instanceof DataBufferByte) {
((DataBufferByte)db).getData();
} else {
try {
img.setAccelerationPriority(0.0f);
} catch (Throwable e) {}
}
}
return img;
}
private static BufferedImage makeUnmanagedBI(final int type) {
final BufferedImage bi = new BufferedImage(511, 255, type);
final DataBuffer db = bi.getRaster().getDataBuffer();
if (db instanceof DataBufferInt) {
((DataBufferInt) db).getData();
} else if (db instanceof DataBufferShort) {
((DataBufferShort) db).getData();
} else if (db instanceof DataBufferByte) {
((DataBufferByte) db).getData();
} else {
try {
bi.setAccelerationPriority(0.0f);
} catch (final Throwable ignored) {
}
}
return bi;
}
private static BufferedImage makeUnmanagedBI(GraphicsConfiguration gc,
int type) {
BufferedImage img = gc.createCompatibleImage(SIZE, SIZE, type);
Graphics2D g2d = img.createGraphics();
g2d.setColor(RGB);
g2d.fillRect(0, 0, SIZE, SIZE);
g2d.dispose();
final DataBuffer db = img.getRaster().getDataBuffer();
if (db instanceof DataBufferInt) {
((DataBufferInt) db).getData();
} else if (db instanceof DataBufferShort) {
((DataBufferShort) db).getData();
} else if (db instanceof DataBufferByte) {
((DataBufferByte) db).getData();
} else {
try {
img.setAccelerationPriority(0.0f);
} catch (final Throwable ignored) {
}
}
return img;
}
/**
* Constructs a byte raster with the given size.
*
* Unsigned cell values are 0 to 255. Signed cell values are -128 to 127.
*
* @param _nx the number of values in x direction
* @param _ny the number of values in y direction
*/
public ByteRaster(int _nx, int _ny) {
ny = _ny;
nx = _nx;
dimension = new Dimension(nx-1, ny-1); // decrease by one to fit inside axes
int len = nx*ny;
packedData = new byte[len];
DataBuffer databuffer = new DataBufferByte(packedData, len);
raster = Raster.createPackedRaster(databuffer, nx, ny, 8, null);
colorModel = createColorModel();
image = new BufferedImage(colorModel, raster, false, null);
xmin = 0;
xmax = nx;
ymin = 0;
ymax = ny;
}
private static BufferedImage getBufferedImage(int sw) {
final BufferedImage bi = new BufferedImage(sw, sw, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2d = bi.createGraphics();
g2d.setColor(Color.RED);
g2d.fillRect(0, 0, sw, sw);
g2d.dispose();
final DataBuffer db = bi.getRaster().getDataBuffer();
if (db instanceof DataBufferInt) {
((DataBufferInt) db).getData();
} else if (db instanceof DataBufferShort) {
((DataBufferShort) db).getData();
} else if (db instanceof DataBufferByte) {
((DataBufferByte) db).getData();
} else {
try {
bi.setAccelerationPriority(0.0f);
} catch (final Throwable ignored) {
}
}
return bi;
}
/**
* Constructs a ByteComponentRaster with the given SampleModel.
* The Raster's upper left corner is origin and it is the same
* size as the SampleModel. A DataBuffer large enough to describe the
* Raster is automatically created. SampleModel must be of type
* SinglePixelPackedSampleModel or ComponentSampleModel.
* @param sampleModel The SampleModel that specifies the layout.
* @param origin The Point that specified the origin.
*/
public ByteComponentRaster(SampleModel sampleModel, Point origin) {
this(sampleModel,
(DataBufferByte) sampleModel.createDataBuffer(),
new Rectangle(origin.x,
origin.y,
sampleModel.getWidth(),
sampleModel.getHeight()),
origin,
null);
}
/**
* Constructs a ByteBandedRaster with the given sampleModel,
* DataBuffer, and parent. DataBuffer must be a DataBufferShort and
* SampleModel must be of type BandedSampleModel.
* When translated into the base Raster's
* coordinate system, aRegion must be contained by the base Raster.
* Origin is the coordinate in the new Raster's coordinate system of
* the origin of the base Raster. (The base Raster is the Raster's
* ancestor which has no parent.)
*
* Note that this constructor should generally be called by other
* constructors or create methods, it should not be used directly.
* @param sampleModel The SampleModel that specifies the layout.
* @param dataBuffer The DataBufferShort that contains the image data.
* @param aRegion The Rectangle that specifies the image area.
* @param origin The Point that specifies the origin.
* @param parent The parent (if any) of this raster.
*/
public ByteBandedRaster(SampleModel sampleModel,
DataBuffer dataBuffer,
Rectangle aRegion,
Point origin,
ByteBandedRaster parent) {
super(sampleModel, dataBuffer, aRegion, origin, parent);
this.maxX = minX + width;
this.maxY = minY + height;
if (!(dataBuffer instanceof DataBufferByte)) {
throw new RasterFormatException("ByteBandedRaster must have" +
"byte DataBuffers");
}
DataBufferByte dbb = (DataBufferByte)dataBuffer;
if (sampleModel instanceof BandedSampleModel) {
BandedSampleModel bsm = (BandedSampleModel)sampleModel;
this.scanlineStride = bsm.getScanlineStride();
int bankIndices[] = bsm.getBankIndices();
int bandOffsets[] = bsm.getBandOffsets();
int dOffsets[] = dbb.getOffsets();
dataOffsets = new int[bankIndices.length];
data = new byte[bankIndices.length][];
int xOffset = aRegion.x - origin.x;
int yOffset = aRegion.y - origin.y;
for (int i = 0; i < bankIndices.length; i++) {
data[i] = stealData(dbb, bankIndices[i]);
dataOffsets[i] = dOffsets[bankIndices[i]] +
xOffset + yOffset*scanlineStride + bandOffsets[i];
}
} else {
throw new RasterFormatException("ByteBandedRasters must have"+
"BandedSampleModels");
}
verify();
}