Examples with ImageTypeSpecifier javax.imageio.ImageTypeSpecifier used on opensource projects

Example 16 with ImageTypeSpecifier

use of javax.imageio.ImageTypeSpecifier in project jdk8u_jdk by JetBrains.

the class BMPImageWriter method write.

public void write(IIOMetadata streamMetadata, IIOImage image, ImageWriteParam param) throws IOException {
    if (stream == null) {
        throw new IllegalStateException(I18N.getString("BMPImageWriter7"));
    }
    if (image == null) {
        throw new IllegalArgumentException(I18N.getString("BMPImageWriter8"));
    }
    clearAbortRequest();
    processImageStarted(0);
    if (param == null)
        param = getDefaultWriteParam();
    BMPImageWriteParam bmpParam = (BMPImageWriteParam) param;
    // Default is using 24 bits per pixel.
    int bitsPerPixel = 24;
    boolean isPalette = false;
    int paletteEntries = 0;
    IndexColorModel icm = null;
    RenderedImage input = null;
    Raster inputRaster = null;
    boolean writeRaster = image.hasRaster();
    Rectangle sourceRegion = param.getSourceRegion();
    SampleModel sampleModel = null;
    ColorModel colorModel = null;
    compImageSize = 0;
    if (writeRaster) {
        inputRaster = image.getRaster();
        sampleModel = inputRaster.getSampleModel();
        colorModel = ImageUtil.createColorModel(null, sampleModel);
        if (sourceRegion == null)
            sourceRegion = inputRaster.getBounds();
        else
            sourceRegion = sourceRegion.intersection(inputRaster.getBounds());
    } else {
        input = image.getRenderedImage();
        sampleModel = input.getSampleModel();
        colorModel = input.getColorModel();
        Rectangle rect = new Rectangle(input.getMinX(), input.getMinY(), input.getWidth(), input.getHeight());
        if (sourceRegion == null)
            sourceRegion = rect;
        else
            sourceRegion = sourceRegion.intersection(rect);
    }
    IIOMetadata imageMetadata = image.getMetadata();
    BMPMetadata bmpImageMetadata = null;
    if (imageMetadata != null && imageMetadata instanceof BMPMetadata) {
        bmpImageMetadata = (BMPMetadata) imageMetadata;
    } else {
        ImageTypeSpecifier imageType = new ImageTypeSpecifier(colorModel, sampleModel);
        bmpImageMetadata = (BMPMetadata) getDefaultImageMetadata(imageType, param);
    }
    if (sourceRegion.isEmpty())
        throw new RuntimeException(I18N.getString("BMPImageWrite0"));
    int scaleX = param.getSourceXSubsampling();
    int scaleY = param.getSourceYSubsampling();
    int xOffset = param.getSubsamplingXOffset();
    int yOffset = param.getSubsamplingYOffset();
    // cache the data type;
    int dataType = sampleModel.getDataType();
    sourceRegion.translate(xOffset, yOffset);
    sourceRegion.width -= xOffset;
    sourceRegion.height -= yOffset;
    int minX = sourceRegion.x / scaleX;
    int minY = sourceRegion.y / scaleY;
    w = (sourceRegion.width + scaleX - 1) / scaleX;
    h = (sourceRegion.height + scaleY - 1) / scaleY;
    xOffset = sourceRegion.x % scaleX;
    yOffset = sourceRegion.y % scaleY;
    Rectangle destinationRegion = new Rectangle(minX, minY, w, h);
    boolean noTransform = destinationRegion.equals(sourceRegion);
    // Raw data can only handle bytes, everything greater must be ASCII.
    int[] sourceBands = param.getSourceBands();
    boolean noSubband = true;
    int numBands = sampleModel.getNumBands();
    if (sourceBands != null) {
        sampleModel = sampleModel.createSubsetSampleModel(sourceBands);
        colorModel = null;
        noSubband = false;
        numBands = sampleModel.getNumBands();
    } else {
        sourceBands = new int[numBands];
        for (int i = 0; i < numBands; i++) sourceBands[i] = i;
    }
    int[] bandOffsets = null;
    boolean bgrOrder = true;
    if (sampleModel instanceof ComponentSampleModel) {
        bandOffsets = ((ComponentSampleModel) sampleModel).getBandOffsets();
        if (sampleModel instanceof BandedSampleModel) {
            // for images with BandedSampleModel we can not work
            //  with raster directly and must use writePixels()
            bgrOrder = false;
        } else {
            // In any other case we must use writePixels()
            for (int i = 0; i < bandOffsets.length; i++) {
                bgrOrder &= (bandOffsets[i] == (bandOffsets.length - i - 1));
            }
        }
    } else {
        if (sampleModel instanceof SinglePixelPackedSampleModel) {
            // BugId 4892214: we can not work with raster directly
            // if image have different color order than RGB.
            // We should use writePixels() for such images.
            int[] bitOffsets = ((SinglePixelPackedSampleModel) sampleModel).getBitOffsets();
            for (int i = 0; i < bitOffsets.length - 1; i++) {
                bgrOrder &= bitOffsets[i] > bitOffsets[i + 1];
            }
        }
    }
    if (bandOffsets == null) {
        // we will use getPixels() to extract pixel data for writePixels()
        // Please note that getPixels() provides rgb bands order.
        bandOffsets = new int[numBands];
        for (int i = 0; i < numBands; i++) bandOffsets[i] = i;
    }
    noTransform &= bgrOrder;
    int[] sampleSize = sampleModel.getSampleSize();
    //XXX: check more
    // Number of bytes that a scanline for the image written out will have.
    int destScanlineBytes = w * numBands;
    switch(bmpParam.getCompressionMode()) {
        case ImageWriteParam.MODE_EXPLICIT:
            compressionType = BMPCompressionTypes.getType(bmpParam.getCompressionType());
            break;
        case ImageWriteParam.MODE_COPY_FROM_METADATA:
            compressionType = bmpImageMetadata.compression;
            break;
        case ImageWriteParam.MODE_DEFAULT:
            compressionType = getPreferredCompressionType(colorModel, sampleModel);
            break;
        default:
            // ImageWriteParam.MODE_DISABLED:
            compressionType = BI_RGB;
    }
    if (!canEncodeImage(compressionType, colorModel, sampleModel)) {
        throw new IOException("Image can not be encoded with compression type " + BMPCompressionTypes.getName(compressionType));
    }
    byte[] r = null, g = null, b = null, a = null;
    if (compressionType == BI_BITFIELDS) {
        bitsPerPixel = DataBuffer.getDataTypeSize(sampleModel.getDataType());
        if (bitsPerPixel != 16 && bitsPerPixel != 32) {
            // we should use 32bpp images in case of BI_BITFIELD
            // compression to avoid color conversion artefacts
            bitsPerPixel = 32;
            // Setting this flag to false ensures that generic
            // writePixels() will be used to store image data
            noTransform = false;
        }
        destScanlineBytes = w * bitsPerPixel + 7 >> 3;
        isPalette = true;
        paletteEntries = 3;
        r = new byte[paletteEntries];
        g = new byte[paletteEntries];
        b = new byte[paletteEntries];
        a = new byte[paletteEntries];
        int rmask = 0x00ff0000;
        int gmask = 0x0000ff00;
        int bmask = 0x000000ff;
        if (bitsPerPixel == 16) {
            /* NB: canEncodeImage() ensures we have image of
                 * either USHORT_565_RGB or USHORT_555_RGB type here.
                 * Technically, it should work for other direct color
                 * model types but it might be non compatible with win98
                 * and friends.
                 */
            if (colorModel instanceof DirectColorModel) {
                DirectColorModel dcm = (DirectColorModel) colorModel;
                rmask = dcm.getRedMask();
                gmask = dcm.getGreenMask();
                bmask = dcm.getBlueMask();
            } else {
                // an exception related to unsupported image format
                throw new IOException("Image can not be encoded with " + "compression type " + BMPCompressionTypes.getName(compressionType));
            }
        }
        writeMaskToPalette(rmask, 0, r, g, b, a);
        writeMaskToPalette(gmask, 1, r, g, b, a);
        writeMaskToPalette(bmask, 2, r, g, b, a);
        if (!noTransform) {
            // prepare info for writePixels procedure
            bitMasks = new int[3];
            bitMasks[0] = rmask;
            bitMasks[1] = gmask;
            bitMasks[2] = bmask;
            bitPos = new int[3];
            bitPos[0] = firstLowBit(rmask);
            bitPos[1] = firstLowBit(gmask);
            bitPos[2] = firstLowBit(bmask);
        }
        if (colorModel instanceof IndexColorModel) {
            icm = (IndexColorModel) colorModel;
        }
    } else {
        // handle BI_RGB compression
        if (colorModel instanceof IndexColorModel) {
            isPalette = true;
            icm = (IndexColorModel) colorModel;
            paletteEntries = icm.getMapSize();
            if (paletteEntries <= 2) {
                bitsPerPixel = 1;
                destScanlineBytes = w + 7 >> 3;
            } else if (paletteEntries <= 16) {
                bitsPerPixel = 4;
                destScanlineBytes = w + 1 >> 1;
            } else if (paletteEntries <= 256) {
                bitsPerPixel = 8;
            } else {
                // Cannot be written as a Palette image. So write out as
                // 24 bit image.
                bitsPerPixel = 24;
                isPalette = false;
                paletteEntries = 0;
                destScanlineBytes = w * 3;
            }
            if (isPalette == true) {
                r = new byte[paletteEntries];
                g = new byte[paletteEntries];
                b = new byte[paletteEntries];
                a = new byte[paletteEntries];
                icm.getAlphas(a);
                icm.getReds(r);
                icm.getGreens(g);
                icm.getBlues(b);
            }
        } else {
            // Grey scale images
            if (numBands == 1) {
                isPalette = true;
                paletteEntries = 256;
                bitsPerPixel = sampleSize[0];
                destScanlineBytes = (w * bitsPerPixel + 7 >> 3);
                r = new byte[256];
                g = new byte[256];
                b = new byte[256];
                a = new byte[256];
                for (int i = 0; i < 256; i++) {
                    r[i] = (byte) i;
                    g[i] = (byte) i;
                    b[i] = (byte) i;
                    a[i] = (byte) 255;
                }
            } else {
                if (sampleModel instanceof SinglePixelPackedSampleModel && noSubband) {
                    /* NB: the actual pixel size can be smaller than
                         * size of used DataBuffer element.
                         * For example: in case of TYPE_INT_RGB actual pixel
                         * size is 24 bits, but size of DataBuffere element
                         * is 32 bits
                         */
                    int[] sample_sizes = sampleModel.getSampleSize();
                    bitsPerPixel = 0;
                    for (int size : sample_sizes) {
                        bitsPerPixel += size;
                    }
                    bitsPerPixel = roundBpp(bitsPerPixel);
                    if (bitsPerPixel != DataBuffer.getDataTypeSize(sampleModel.getDataType())) {
                        noTransform = false;
                    }
                    destScanlineBytes = w * bitsPerPixel + 7 >> 3;
                }
            }
        }
    }
    // actual writing of image data
    int fileSize = 0;
    int offset = 0;
    int headerSize = 0;
    int imageSize = 0;
    int xPelsPerMeter = 0;
    int yPelsPerMeter = 0;
    int colorsUsed = 0;
    int colorsImportant = paletteEntries;
    // Calculate padding for each scanline
    int padding = destScanlineBytes % 4;
    if (padding != 0) {
        padding = 4 - padding;
    }
    // FileHeader is 14 bytes, BitmapHeader is 40 bytes,
    // add palette size and that is where the data will begin
    offset = 54 + paletteEntries * 4;
    imageSize = (destScanlineBytes + padding) * h;
    fileSize = imageSize + offset;
    headerSize = 40;
    long headPos = stream.getStreamPosition();
    writeFileHeader(fileSize, offset);
    /* According to MSDN description, the top-down image layout
         * is allowed only if compression type is BI_RGB or BI_BITFIELDS.
         * Images with any other compression type must be wrote in the
         * bottom-up layout.
         */
    if (compressionType == BI_RGB || compressionType == BI_BITFIELDS) {
        isTopDown = bmpParam.isTopDown();
    } else {
        isTopDown = false;
    }
    writeInfoHeader(headerSize, bitsPerPixel);
    // compression
    stream.writeInt(compressionType);
    // imageSize
    stream.writeInt(imageSize);
    // xPelsPerMeter
    stream.writeInt(xPelsPerMeter);
    // yPelsPerMeter
    stream.writeInt(yPelsPerMeter);
    // Colors Used
    stream.writeInt(colorsUsed);
    // Colors Important
    stream.writeInt(colorsImportant);
    // palette
    if (isPalette == true) {
        // write palette
        if (compressionType == BI_BITFIELDS) {
            // write masks for red, green and blue components.
            for (int i = 0; i < 3; i++) {
                int mask = (a[i] & 0xFF) + ((r[i] & 0xFF) * 0x100) + ((g[i] & 0xFF) * 0x10000) + ((b[i] & 0xFF) * 0x1000000);
                stream.writeInt(mask);
            }
        } else {
            for (int i = 0; i < paletteEntries; i++) {
                stream.writeByte(b[i]);
                stream.writeByte(g[i]);
                stream.writeByte(r[i]);
                stream.writeByte(a[i]);
            }
        }
    }
    // Writing of actual image data
    int scanlineBytes = w * numBands;
    // Buffer for up to 8 rows of pixels
    int[] pixels = new int[scanlineBytes * scaleX];
    // Also create a buffer to hold one line of the data
    // to be written to the file, so we can use array writes.
    bpixels = new byte[destScanlineBytes];
    int l;
    if (compressionType == BI_JPEG || compressionType == BI_PNG) {
        // prepare embedded buffer
        embedded_stream = new ByteArrayOutputStream();
        writeEmbedded(image, bmpParam);
        // update the file/image Size
        embedded_stream.flush();
        imageSize = embedded_stream.size();
        long endPos = stream.getStreamPosition();
        fileSize = (int) (offset + imageSize);
        stream.seek(headPos);
        writeSize(fileSize, 2);
        stream.seek(headPos);
        writeSize(imageSize, 34);
        stream.seek(endPos);
        stream.write(embedded_stream.toByteArray());
        embedded_stream = null;
        if (abortRequested()) {
            processWriteAborted();
        } else {
            processImageComplete();
            stream.flushBefore(stream.getStreamPosition());
        }
        return;
    }
    int maxBandOffset = bandOffsets[0];
    for (int i = 1; i < bandOffsets.length; i++) if (bandOffsets[i] > maxBandOffset)
        maxBandOffset = bandOffsets[i];
    int[] pixel = new int[maxBandOffset + 1];
    int destScanlineLength = destScanlineBytes;
    if (noTransform && noSubband) {
        destScanlineLength = destScanlineBytes / (DataBuffer.getDataTypeSize(dataType) >> 3);
    }
    for (int i = 0; i < h; i++) {
        if (abortRequested()) {
            break;
        }
        int row = minY + i;
        if (!isTopDown)
            row = minY + h - i - 1;
        // Get the pixels
        Raster src = inputRaster;
        Rectangle srcRect = new Rectangle(minX * scaleX + xOffset, row * scaleY + yOffset, (w - 1) * scaleX + 1, 1);
        if (!writeRaster)
            src = input.getData(srcRect);
        if (noTransform && noSubband) {
            SampleModel sm = src.getSampleModel();
            int pos = 0;
            int startX = srcRect.x - src.getSampleModelTranslateX();
            int startY = srcRect.y - src.getSampleModelTranslateY();
            if (sm instanceof ComponentSampleModel) {
                ComponentSampleModel csm = (ComponentSampleModel) sm;
                pos = csm.getOffset(startX, startY, 0);
                for (int nb = 1; nb < csm.getNumBands(); nb++) {
                    if (pos > csm.getOffset(startX, startY, nb)) {
                        pos = csm.getOffset(startX, startY, nb);
                    }
                }
            } else if (sm instanceof MultiPixelPackedSampleModel) {
                MultiPixelPackedSampleModel mppsm = (MultiPixelPackedSampleModel) sm;
                pos = mppsm.getOffset(startX, startY);
            } else if (sm instanceof SinglePixelPackedSampleModel) {
                SinglePixelPackedSampleModel sppsm = (SinglePixelPackedSampleModel) sm;
                pos = sppsm.getOffset(startX, startY);
            }
            if (compressionType == BI_RGB || compressionType == BI_BITFIELDS) {
                switch(dataType) {
                    case DataBuffer.TYPE_BYTE:
                        byte[] bdata = ((DataBufferByte) src.getDataBuffer()).getData();
                        stream.write(bdata, pos, destScanlineLength);
                        break;
                    case DataBuffer.TYPE_SHORT:
                        short[] sdata = ((DataBufferShort) src.getDataBuffer()).getData();
                        stream.writeShorts(sdata, pos, destScanlineLength);
                        break;
                    case DataBuffer.TYPE_USHORT:
                        short[] usdata = ((DataBufferUShort) src.getDataBuffer()).getData();
                        stream.writeShorts(usdata, pos, destScanlineLength);
                        break;
                    case DataBuffer.TYPE_INT:
                        int[] idata = ((DataBufferInt) src.getDataBuffer()).getData();
                        stream.writeInts(idata, pos, destScanlineLength);
                        break;
                }
                for (int k = 0; k < padding; k++) {
                    stream.writeByte(0);
                }
            } else if (compressionType == BI_RLE4) {
                if (bpixels == null || bpixels.length < scanlineBytes)
                    bpixels = new byte[scanlineBytes];
                src.getPixels(srcRect.x, srcRect.y, srcRect.width, srcRect.height, pixels);
                for (int h = 0; h < scanlineBytes; h++) {
                    bpixels[h] = (byte) pixels[h];
                }
                encodeRLE4(bpixels, scanlineBytes);
            } else if (compressionType == BI_RLE8) {
                //System.arraycopy(bdata, pos, bpixels, 0, scanlineBytes);
                if (bpixels == null || bpixels.length < scanlineBytes)
                    bpixels = new byte[scanlineBytes];
                src.getPixels(srcRect.x, srcRect.y, srcRect.width, srcRect.height, pixels);
                for (int h = 0; h < scanlineBytes; h++) {
                    bpixels[h] = (byte) pixels[h];
                }
                encodeRLE8(bpixels, scanlineBytes);
            }
        } else {
            src.getPixels(srcRect.x, srcRect.y, srcRect.width, srcRect.height, pixels);
            if (scaleX != 1 || maxBandOffset != numBands - 1) {
                for (int j = 0, k = 0, n = 0; j < w; j++, k += scaleX * numBands, n += numBands) {
                    System.arraycopy(pixels, k, pixel, 0, pixel.length);
                    for (int m = 0; m < numBands; m++) {
                        // pixel data is provided here in RGB order
                        pixels[n + m] = pixel[sourceBands[m]];
                    }
                }
            }
            writePixels(0, scanlineBytes, bitsPerPixel, pixels, padding, numBands, icm);
        }
        processImageProgress(100.0f * (((float) i) / ((float) h)));
    }
    if (compressionType == BI_RLE4 || compressionType == BI_RLE8) {
        // Write the RLE EOF marker and
        stream.writeByte(0);
        stream.writeByte(1);
        incCompImageSize(2);
        // update the file/image Size
        imageSize = compImageSize;
        fileSize = compImageSize + offset;
        long endPos = stream.getStreamPosition();
        stream.seek(headPos);
        writeSize(fileSize, 2);
        stream.seek(headPos);
        writeSize(imageSize, 34);
        stream.seek(endPos);
    }
    if (abortRequested()) {
        processWriteAborted();
    } else {
        processImageComplete();
        stream.flushBefore(stream.getStreamPosition());
    }
}

Example 17 with ImageTypeSpecifier

use of javax.imageio.ImageTypeSpecifier in project jdk8u_jdk by JetBrains.

the class WBMPImageReader method getImageTypes.

public Iterator getImageTypes(int imageIndex) throws IOException {
    checkIndex(imageIndex);
    readHeader();
    BufferedImage bi = new BufferedImage(1, 1, BufferedImage.TYPE_BYTE_BINARY);
    ArrayList list = new ArrayList(1);
    list.add(new ImageTypeSpecifier(bi));
    return list.iterator();
}

Example 18 with ImageTypeSpecifier

use of javax.imageio.ImageTypeSpecifier in project jdk8u_jdk by JetBrains.

the class GIFImageWriteParam method writeImage.

/**
     * Writes any extension blocks, the Image Descriptor, and the image data
     *
     * @param iioimage The image and image metadata.
     * @param param The write parameters.
     * @param globalColorTable The Global Color Table.
     * @param sourceBounds The source region.
     * @param destSize The destination dimensions.
     */
private void writeImage(RenderedImage image, GIFWritableImageMetadata imageMetadata, ImageWriteParam param, byte[] globalColorTable, Rectangle sourceBounds, Dimension destSize) throws IOException {
    ColorModel colorModel = image.getColorModel();
    SampleModel sampleModel = image.getSampleModel();
    boolean writeGraphicsControlExtension;
    if (imageMetadata == null) {
        // Create default metadata.
        imageMetadata = (GIFWritableImageMetadata) getDefaultImageMetadata(new ImageTypeSpecifier(image), param);
        // Set GraphicControlExtension flag only if there is
        // transparency.
        writeGraphicsControlExtension = imageMetadata.transparentColorFlag;
    } else {
        // Check for GraphicControlExtension element.
        NodeList list = null;
        try {
            IIOMetadataNode root = (IIOMetadataNode) imageMetadata.getAsTree(IMAGE_METADATA_NAME);
            list = root.getElementsByTagName("GraphicControlExtension");
        } catch (IllegalArgumentException iae) {
        // Should never happen.
        }
        // Set GraphicControlExtension flag if element present.
        writeGraphicsControlExtension = list != null && list.getLength() > 0;
        // the interlacing is set per the ImageWriteParam mode setting.
        if (param != null && param.canWriteProgressive()) {
            if (param.getProgressiveMode() == ImageWriteParam.MODE_DISABLED) {
                imageMetadata.interlaceFlag = false;
            } else if (param.getProgressiveMode() == ImageWriteParam.MODE_DEFAULT) {
                imageMetadata.interlaceFlag = true;
            }
        }
    }
    // Unset local color table if equal to global color table.
    if (Arrays.equals(globalColorTable, imageMetadata.localColorTable)) {
        imageMetadata.localColorTable = null;
    }
    // Override dimensions
    imageMetadata.imageWidth = destSize.width;
    imageMetadata.imageHeight = destSize.height;
    // Write Graphics Control Extension.
    if (writeGraphicsControlExtension) {
        writeGraphicControlExtension(imageMetadata);
    }
    // Write extension blocks.
    writePlainTextExtension(imageMetadata);
    writeApplicationExtension(imageMetadata);
    writeCommentExtension(imageMetadata);
    // Write Image Descriptor
    int bitsPerPixel = getNumBits(imageMetadata.localColorTable == null ? (globalColorTable == null ? sampleModel.getSampleSize(0) : globalColorTable.length / 3) : imageMetadata.localColorTable.length / 3);
    writeImageDescriptor(imageMetadata, bitsPerPixel);
    // Write image data
    writeRasterData(image, sourceBounds, destSize, param, imageMetadata.interlaceFlag);
}

Example 19 with ImageTypeSpecifier

use of javax.imageio.ImageTypeSpecifier in project jdk8u_jdk by JetBrains.

the class GIFImageReader method createIndexed.

// We don't check all parameters as ImageTypeSpecifier.createIndexed do
// since this method is private and we pass consistent data here
private ImageTypeSpecifier createIndexed(byte[] r, byte[] g, byte[] b, int bits) {
    ColorModel colorModel;
    if (imageMetadata.transparentColorFlag) {
        // Some files erroneously have a transparent color index
        // of 255 even though there are fewer than 256 colors.
        int idx = Math.min(imageMetadata.transparentColorIndex, r.length - 1);
        colorModel = new IndexColorModel(bits, r.length, r, g, b, idx);
    } else {
        colorModel = new IndexColorModel(bits, r.length, r, g, b);
    }
    SampleModel sampleModel;
    if (bits == 8) {
        int[] bandOffsets = { 0 };
        sampleModel = new PixelInterleavedSampleModel(DataBuffer.TYPE_BYTE, 1, 1, 1, 1, bandOffsets);
    } else {
        sampleModel = new MultiPixelPackedSampleModel(DataBuffer.TYPE_BYTE, 1, 1, bits);
    }
    return new ImageTypeSpecifier(colorModel, sampleModel);
}

Example 20 with ImageTypeSpecifier

use of javax.imageio.ImageTypeSpecifier in project jdk8u_jdk by JetBrains.

the class PNGImageReader method getImageTypes.

public Iterator<ImageTypeSpecifier> getImageTypes(int imageIndex) throws IIOException {
    if (imageIndex != 0) {
        throw new IndexOutOfBoundsException("imageIndex != 0!");
    }
    readHeader();
    ArrayList<ImageTypeSpecifier> l = new ArrayList<ImageTypeSpecifier>(1);
    ColorSpace rgb;
    ColorSpace gray;
    int[] bandOffsets;
    int bitDepth = metadata.IHDR_bitDepth;
    int colorType = metadata.IHDR_colorType;
    int dataType;
    if (bitDepth <= 8) {
        dataType = DataBuffer.TYPE_BYTE;
    } else {
        dataType = DataBuffer.TYPE_USHORT;
    }
    switch(colorType) {
        case PNG_COLOR_GRAY:
            // Packed grayscale
            l.add(ImageTypeSpecifier.createGrayscale(bitDepth, dataType, false));
            break;
        case PNG_COLOR_RGB:
            if (bitDepth == 8) {
                // some standard types of buffered images
                // which can be used as destination
                l.add(ImageTypeSpecifier.createFromBufferedImageType(BufferedImage.TYPE_3BYTE_BGR));
                l.add(ImageTypeSpecifier.createFromBufferedImageType(BufferedImage.TYPE_INT_RGB));
                l.add(ImageTypeSpecifier.createFromBufferedImageType(BufferedImage.TYPE_INT_BGR));
            }
            // Component R, G, B
            rgb = ColorSpace.getInstance(ColorSpace.CS_sRGB);
            bandOffsets = new int[3];
            bandOffsets[0] = 0;
            bandOffsets[1] = 1;
            bandOffsets[2] = 2;
            l.add(ImageTypeSpecifier.createInterleaved(rgb, bandOffsets, dataType, false, false));
            break;
        case PNG_COLOR_PALETTE:
            // Need tRNS chunk
            readMetadata();
            /*
             * The PLTE chunk spec says:
             *
             * The number of palette entries must not exceed the range that
             * can be represented in the image bit depth (for example, 2^4 = 16
             * for a bit depth of 4). It is permissible to have fewer entries
             * than the bit depth would allow. In that case, any out-of-range
             * pixel value found in the image data is an error.
             *
             * http://www.libpng.org/pub/png/spec/1.2/PNG-Chunks.html#C.PLTE
             *
             * Consequently, the case when the palette length is smaller than
             * 2^bitDepth is legal in the view of PNG spec.
             *
             * However the spec of createIndexed() method demands the exact
             * equality of the palette lengh and number of possible palette
             * entries (2^bitDepth).
             *
             * {@link javax.imageio.ImageTypeSpecifier.html#createIndexed}
             *
             * In order to avoid this contradiction we need to extend the
             * palette arrays to the limit defined by the bitDepth.
             */
            int plength = 1 << bitDepth;
            byte[] red = metadata.PLTE_red;
            byte[] green = metadata.PLTE_green;
            byte[] blue = metadata.PLTE_blue;
            if (metadata.PLTE_red.length < plength) {
                red = Arrays.copyOf(metadata.PLTE_red, plength);
                Arrays.fill(red, metadata.PLTE_red.length, plength, metadata.PLTE_red[metadata.PLTE_red.length - 1]);
                green = Arrays.copyOf(metadata.PLTE_green, plength);
                Arrays.fill(green, metadata.PLTE_green.length, plength, metadata.PLTE_green[metadata.PLTE_green.length - 1]);
                blue = Arrays.copyOf(metadata.PLTE_blue, plength);
                Arrays.fill(blue, metadata.PLTE_blue.length, plength, metadata.PLTE_blue[metadata.PLTE_blue.length - 1]);
            }
            // Alpha from tRNS chunk may have fewer entries than
            // the RGB LUTs from the PLTE chunk; if so, pad with
            // 255.
            byte[] alpha = null;
            if (metadata.tRNS_present && (metadata.tRNS_alpha != null)) {
                if (metadata.tRNS_alpha.length == red.length) {
                    alpha = metadata.tRNS_alpha;
                } else {
                    alpha = Arrays.copyOf(metadata.tRNS_alpha, red.length);
                    Arrays.fill(alpha, metadata.tRNS_alpha.length, red.length, (byte) 255);
                }
            }
            l.add(ImageTypeSpecifier.createIndexed(red, green, blue, alpha, bitDepth, DataBuffer.TYPE_BYTE));
            break;
        case PNG_COLOR_GRAY_ALPHA:
            // Component G, A
            gray = ColorSpace.getInstance(ColorSpace.CS_GRAY);
            bandOffsets = new int[2];
            bandOffsets[0] = 0;
            bandOffsets[1] = 1;
            l.add(ImageTypeSpecifier.createInterleaved(gray, bandOffsets, dataType, true, false));
            break;
        case PNG_COLOR_RGB_ALPHA:
            if (bitDepth == 8) {
                // some standard types of buffered images
                // wich can be used as destination
                l.add(ImageTypeSpecifier.createFromBufferedImageType(BufferedImage.TYPE_4BYTE_ABGR));
                l.add(ImageTypeSpecifier.createFromBufferedImageType(BufferedImage.TYPE_INT_ARGB));
            }
            // Component R, G, B, A (non-premultiplied)
            rgb = ColorSpace.getInstance(ColorSpace.CS_sRGB);
            bandOffsets = new int[4];
            bandOffsets[0] = 0;
            bandOffsets[1] = 1;
            bandOffsets[2] = 2;
            bandOffsets[3] = 3;
            l.add(ImageTypeSpecifier.createInterleaved(rgb, bandOffsets, dataType, true, false));
            break;
        default:
            break;
    }
    return l.iterator();
}