Java Raster.createPackedRaster方法代碼示例

import java.awt.image.Raster; //導入方法依賴的package包/類
/**
 * Converts raw data into JPG image and encode it into Base64 string for sending it to the JS client
 * 
 * @param rawImg
 *            raw image bytes
 * @return Base64 encoded string with JPG image
 */
private String bufferAsJpgString(byte[] rawImg) {
    int[] pixels = new int[rawImg.length];
    for (int i = 0; i < rawImg.length; i++) {
        pixels[i] = (int) rawImg[i];
    }
    DataBufferInt buffer = new DataBufferInt(pixels, pixels.length);
    WritableRaster raster = Raster.createPackedRaster(buffer, IMG_SIZE, IMG_SIZE, IMG_SIZE, BAND_MASKS, null);
    ColorModel cm = ColorModel.getRGBdefault();
    BufferedImage image = new BufferedImage(cm, raster, cm.isAlphaPremultiplied(), null);

    byte[] imgBytes = null;
    try (ByteArrayOutputStream baos = new ByteArrayOutputStream()) {
        ImageIO.write(image, "JPG", baos);
        baos.flush();
        imgBytes = baos.toByteArray();
    } catch (IOException e) {
        // TODO log exception
    }

    byte[] encoded = Base64.getEncoder().encode(imgBytes);
    return new String(encoded);
}
 

import java.awt.image.Raster; //導入方法依賴的package包/類
public BufferedImage getOpaqueRGBImage() {
    if (bimage.getType() == BufferedImage.TYPE_INT_ARGB) {
        int w = bimage.getWidth();
        int h = bimage.getHeight();
        int size = w * h;

        // Note that we steal the data array here, but only for reading...
        DataBufferInt db = (DataBufferInt)biRaster.getDataBuffer();
        int[] pixels = SunWritableRaster.stealData(db, 0);

        for (int i = 0; i < size; i++) {
            if ((pixels[i] >>> 24) != 0xff) {
                return bimage;
            }
        }

        ColorModel opModel = new DirectColorModel(24,
                                                  0x00ff0000,
                                                  0x0000ff00,
                                                  0x000000ff);

        int bandmasks[] = {0x00ff0000, 0x0000ff00, 0x000000ff};
        WritableRaster opRaster = Raster.createPackedRaster(db, w, h, w,
                                                            bandmasks,
                                                            null);

        try {
            BufferedImage opImage = createImage(opModel, opRaster,
                                                false, null);
            return opImage;
        } catch (Exception e) {
            return bimage;
        }
    }
    return bimage;
}
 

import java.awt.image.Raster; //導入方法依賴的package包/類
/**
 * Translates either a byte array or an input stream which contain
 * platform-specific image data in the given format into an Image.
 */
@Override
protected Image platformImageBytesToImage(byte[] bytes, long format)
        throws IOException {
    String mimeType = null;
    if (format == CF_PNG) {
        mimeType = "image/png";
    } else if (format == CF_JFIF) {
        mimeType = "image/jpeg";
    }
    if (mimeType != null) {
        return standardImageBytesToImage(bytes, mimeType);
    }

    int[] imageData = platformImageBytesToImageData(bytes, format);
    if (imageData == null) {
        throw new IOException("data translation failed");
    }

    int len = imageData.length - 2;
    int width = imageData[len];
    int height = imageData[len + 1];

    DataBufferInt buffer = new DataBufferInt(imageData, len);
    WritableRaster raster = Raster.createPackedRaster(buffer, width,
            height, width,
            bandmasks, null);

    return new BufferedImage(directColorModel, raster, false, null);
}
 

import java.awt.image.Raster; //導入方法依賴的package包/類
private static void testIntRaster() {
    WritableRaster srcRaster, dstRaster;

    int[] pixels =
        { 11, 12, 13, 14,
          21, 22, 23, 24,
          31, 32, 33, 34,
          41, 42, 43, 44 };

    DataBuffer db = new DataBufferInt(pixels, pixels.length);
    srcRaster =
        Raster.createPackedRaster(db, 4, 4, 4,  offsets, null);
    srcRaster = srcRaster.createWritableChild(1, 1, 3, 3, 0, 0, null);
    dstRaster = rop.filter(srcRaster, null);
}
 

import java.awt.image.Raster; //導入方法依賴的package包/類
private void convertToRGB() {
    int w = bimage.getWidth();
    int h = bimage.getHeight();
    int size = w*h;

    DataBufferInt dbi = new DataBufferInt(size);
    // Note that stealData() requires a markDirty() afterwards
    // since we modify the data in it.
    int newpixels[] = SunWritableRaster.stealData(dbi, 0);
    if (cmodel instanceof IndexColorModel &&
        biRaster instanceof ByteComponentRaster &&
        biRaster.getNumDataElements() == 1)
    {
        ByteComponentRaster bct = (ByteComponentRaster) biRaster;
        byte[] data = bct.getDataStorage();
        int coff = bct.getDataOffset(0);
        for (int i=0; i < size; i++) {
            newpixels[i] = srcLUT[data[coff+i]&0xff];
        }
    }
    else {
        Object srcpixels = null;
        int off=0;
        for (int y=0; y < h; y++) {
            for (int x=0; x < w; x++) {
                srcpixels=biRaster.getDataElements(x, y, srcpixels);
                newpixels[off++] = cmodel.getRGB(srcpixels);
            }
        }
    }
    // We modified the data array directly above so mark it as dirty now...
    SunWritableRaster.markDirty(dbi);

    isSameCM = false;
    cmodel = ColorModel.getRGBdefault();

    int bandMasks[] = {0x00ff0000,
                       0x0000ff00,
                       0x000000ff,
                       0xff000000};

    biRaster = Raster.createPackedRaster(dbi,w,h,w,
                                         bandMasks,null);

    bimage = createImage(cmodel, biRaster,
                         cmodel.isAlphaPremultiplied(), null);
    srcLUT = null;
    isDefaultBI = true;
}