--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/org.eclipse.swt.win32.win32.x86/src/org/eclipse/swt/internal/image/TIFFDirectory.d	Mon Mar 02 14:44:16 2009 +0100
@@ -0,0 +1,634 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2005 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ * Port to the D programming language:
+ *     Frank Benoit <benoit@tionex.de>
+ *******************************************************************************/
+module org.eclipse.swt.internal.image.TIFFDirectory;
+
+import org.eclipse.swt.internal.image.TIFFRandomFileAccess;
+import org.eclipse.swt.internal.image.TIFFModifiedHuffmanCodec;
+import org.eclipse.swt.internal.image.LEDataOutputStream;
+import org.eclipse.swt.graphics.ImageData;
+import org.eclipse.swt.graphics.ImageLoaderEvent;
+import org.eclipse.swt.graphics.ImageLoader;
+import org.eclipse.swt.graphics.PaletteData;
+import org.eclipse.swt.graphics.RGB;
+import org.eclipse.swt.SWT;
+import java.lang.all;
+
+final class TIFFDirectory {
+
+    TIFFRandomFileAccess file;
+    bool isLittleEndian;
+    ImageLoader loader;
+    int depth;
+
+    /* Directory fields */
+    int imageWidth;
+    int imageLength;
+    int[] bitsPerSample;
+    int compression;
+    int photometricInterpretation;
+    int[] stripOffsets;
+    int samplesPerPixel;
+    int rowsPerStrip;
+    int[] stripByteCounts;
+    int t4Options;
+    int colorMapOffset;
+
+    /* Encoder fields */
+    ImageData image;
+    LEDataOutputStream ostr;
+
+    static const int NO_VALUE = -1;
+
+    static const short TAG_ImageWidth = 256;
+    static const short TAG_ImageLength = 257;
+    static const short TAG_BitsPerSample = 258;
+    static const short TAG_Compression = 259;
+    static const short TAG_PhotometricInterpretation = 262;
+    static const short TAG_StripOffsets = 273;
+    static const short TAG_SamplesPerPixel = 277;
+    static const short TAG_RowsPerStrip = 278;
+    static const short TAG_StripByteCounts = 279;
+    static const short TAG_XResolution = 282;
+    static const short TAG_YResolution = 283;
+    static const short TAG_T4Options = 292;
+    static const short TAG_ResolutionUnit = 296;
+    static const short TAG_ColorMap = 320;
+
+    static const int TYPE_BYTE = 1;
+    static const int TYPE_ASCII = 2;
+    static const int TYPE_SHORT = 3;
+    static const int TYPE_LONG = 4;
+    static const int TYPE_RATIONAL = 5;
+
+    /* Different compression schemes */
+    static const int COMPRESSION_NONE = 1;
+    static const int COMPRESSION_CCITT_3_1 = 2;
+    static const int COMPRESSION_PACKBITS = 32773;
+
+    static const int IFD_ENTRY_SIZE = 12;
+
+public this(TIFFRandomFileAccess file, bool isLittleEndian, ImageLoader loader) {
+    this.file = file;
+    this.isLittleEndian = isLittleEndian;
+    this.loader = loader;
+}
+
+public this(ImageData image) {
+    this.image = image;
+}
+
+/* PackBits decoder */
+int decodePackBits(byte[] src, byte[] dest, int offsetDest) {
+    int destIndex = offsetDest;
+    int srcIndex = 0;
+    while (srcIndex < src.length) {
+        byte n = src[srcIndex];
+        if (0 <= n && n <= 127) {
+            /* Copy next n+1 bytes literally */
+            System.arraycopy(src, ++srcIndex, dest, destIndex, n + 1);
+            srcIndex += n + 1;
+            destIndex += n + 1;
+        } else if (-127 <= n && n <= -1) {
+            /* Copy next byte -n+1 times */
+            byte value = src[++srcIndex];
+            for (int j = 0; j < -n + 1; j++) {
+                dest[destIndex++] = value;
+            }
+            srcIndex++;
+        } else {
+            /* Noop when n is -128 */
+            srcIndex++;
+        }
+    }
+    /* Number of bytes copied */
+    return destIndex - offsetDest;
+}
+
+int getEntryValue(int type, byte[] buffer, int index) {
+    return toInt(buffer, index + 8, type);
+}
+
+void getEntryValue(int type, byte[] buffer, int index, int[] values)  {
+    int start = index + 8;
+    int size;
+    int offset = toInt(buffer, start, TYPE_LONG);
+    switch (type) {
+        case TYPE_SHORT: size = 2; break;
+        case TYPE_LONG: size = 4; break;
+        case TYPE_RATIONAL: size = 8; break;
+        case TYPE_ASCII:
+        case TYPE_BYTE: size = 1; break;
+        default: SWT.error(SWT.ERROR_UNSUPPORTED_FORMAT); return;
+    }
+    if (values.length * size > 4) {
+        buffer = new byte[values.length * size];
+        file.seek(offset);
+        file.read(buffer);
+        start = 0;
+    }
+    for (int i = 0; i < values.length; i++) {
+        values[i] = toInt(buffer, start + i * size, type);
+    }
+}
+
+void decodePixels(ImageData image)  {
+    /* Each row is byte aligned */
+    byte[] imageData = new byte[(imageWidth * depth + 7) / 8 * imageLength];
+    image.data = imageData;
+    int destIndex = 0;
+    int length = stripOffsets.length;
+    for (int i = 0; i < length; i++) {
+        /* Read a strip */
+        byte[] data = new byte[](stripByteCounts[i]);
+        file.seek(stripOffsets[i]);
+        file.read(data);
+        if (compression is COMPRESSION_NONE) {
+            System.arraycopy(data, 0, imageData, destIndex, data.length);
+            destIndex += data.length;
+        } else if (compression is COMPRESSION_PACKBITS) {
+            destIndex += decodePackBits(data, imageData, destIndex);
+        } else if (compression is COMPRESSION_CCITT_3_1 || compression is 3) {
+            TIFFModifiedHuffmanCodec codec = new TIFFModifiedHuffmanCodec();
+            int nRows = rowsPerStrip;
+            if (i is length -1) {
+                int n = imageLength % rowsPerStrip;
+                if (n !is 0) nRows = n;
+            }
+            destIndex += codec.decode(data, imageData, destIndex, imageWidth, nRows);
+        }
+        if (loader.hasListeners()) {
+            loader.notifyListeners(new ImageLoaderEvent(loader, image, i, i is length - 1));
+        }
+    }
+}
+
+PaletteData getColorMap()  {
+    int numColors = 1 << bitsPerSample[0];
+    /* R, G, B entries are 16 bit wide (2 bytes) */
+    int numBytes = 3 * 2 * numColors;
+    byte[] buffer = new byte[numBytes];
+    file.seek(colorMapOffset);
+    file.read(buffer);
+    RGB[] colors = new RGB[numColors];
+    /**
+     * SWT does not support 16-bit depth color formats.
+     * Convert the 16-bit data to 8-bit data.
+     * The correct way to do this is to multiply each
+     * 16 bit value by the value:
+     * (2^8 - 1) / (2^16 - 1).
+     * The fast way to do this is just to drop the low
+     * byte of the 16-bit value.
+     */
+    int offset = isLittleEndian ? 1 : 0;
+    int startG = 2 * numColors;
+    int startB = startG + 2 * numColors;
+    for (int i = 0; i < numColors; i++) {
+        int r = buffer[offset] & 0xFF;
+        int g = buffer[startG + offset] & 0xFF;
+        int b = buffer[startB + offset] & 0xFF;
+        colors[i] = new RGB(r, g, b);
+        offset += 2;
+    }
+    return new PaletteData(colors);
+}
+
+PaletteData getGrayPalette() {
+    int numColors = 1 << bitsPerSample[0];
+    RGB[] rgbs = new RGB[numColors];
+    for (int i = 0; i < numColors; i++) {
+        int value = i * 0xFF / (numColors - 1);
+        if (photometricInterpretation is 0) value = 0xFF - value;
+        rgbs[i] = new RGB(value, value, value);
+    }
+    return new PaletteData(rgbs);
+}
+
+PaletteData getRGBPalette(int bitsR, int bitsG, int bitsB) {
+    int blueMask = 0;
+    for (int i = 0; i < bitsB; i++) {
+        blueMask |= 1 << i;
+    }
+    int greenMask = 0;
+    for (int i = bitsB; i < bitsB + bitsG; i++) {
+        greenMask |= 1 << i;
+    }
+    int redMask = 0;
+    for (int i = bitsB + bitsG; i < bitsB + bitsG + bitsR; i++) {
+        redMask |= 1 << i;
+    }
+    return new PaletteData(redMask, greenMask, blueMask);
+}
+
+int formatStrips(int rowByteSize, int nbrRows, byte[] data, int maxStripByteSize, int offsetPostIFD, int extraBytes, int[][] strips) {
+    /*
+    * Calculate the nbr of required strips given the following requirements:
+    * - each strip should, if possible, not be greater than maxStripByteSize
+    * - each strip should contain 1 or more entire rows
+    *
+    * Format the strip fields arrays so that the image data is stored in one
+    * contiguous block. This block is stored after the IFD and after any tag
+    * info described in the IFD.
+    */
+    int n, nbrRowsPerStrip;
+    if (rowByteSize > maxStripByteSize) {
+        /* Each strip contains 1 row */
+        n = data.length / rowByteSize;
+        nbrRowsPerStrip = 1;
+    } else {
+        int nbr = (data.length + maxStripByteSize - 1) / maxStripByteSize;
+        nbrRowsPerStrip = nbrRows / nbr;
+        n = (nbrRows + nbrRowsPerStrip - 1) / nbrRowsPerStrip;
+    }
+    int stripByteSize = rowByteSize * nbrRowsPerStrip;
+
+    int[] offsets = new int[n];
+    int[] counts = new int[n];
+    /*
+    * Nbr of bytes between the end of the IFD directory and the start of
+    * the image data. Keep space for at least the offsets and counts
+    * data, each field being TYPE_LONG (4 bytes). If other tags require
+    * space between the IFD and the image block, use the extraBytes
+    * parameter.
+    * If there is only one strip, the offsets and counts data is stored
+    * directly in the IFD and we need not reserve space for it.
+    */
+    int postIFDData = n is 1 ? 0 : n * 2 * 4;
+    int startOffset = offsetPostIFD + extraBytes + postIFDData; /* offset of image data */
+
+    int offset = startOffset;
+    for (int i = 0; i < n; i++) {
+        /*
+        * Store all strips sequentially to allow us
+        * to copy all pixels in one contiguous area.
+        */
+        offsets[i] = offset;
+        counts[i] = stripByteSize;
+        offset += stripByteSize;
+    }
+    /* The last strip may contain fewer rows */
+    int mod = data.length % stripByteSize;
+    if (mod !is 0) counts[counts.length - 1] = mod;
+
+    strips[0] = offsets;
+    strips[1] = counts;
+    return nbrRowsPerStrip;
+}
+
+int[] formatColorMap(RGB[] rgbs) {
+    /*
+    * In a TIFF ColorMap, all red come first, followed by
+    * green and blue. All values must be converted from
+    * 8 bit to 16 bit.
+    */
+    int[] colorMap = new int[rgbs.length * 3];
+    int offsetGreen = rgbs.length;
+    int offsetBlue = rgbs.length * 2;
+    for (int i = 0; i < rgbs.length; i++) {
+        colorMap[i] = rgbs[i].red << 8 | rgbs[i].red;
+        colorMap[i + offsetGreen] = rgbs[i].green << 8 | rgbs[i].green;
+        colorMap[i + offsetBlue] = rgbs[i].blue << 8 | rgbs[i].blue;
+    }
+    return colorMap;
+}
+
+void parseEntries(byte[] buffer)  {
+    for (int offset = 0; offset < buffer.length; offset += IFD_ENTRY_SIZE) {
+        int tag = toInt(buffer, offset, TYPE_SHORT);
+        int type = toInt(buffer, offset + 2, TYPE_SHORT);
+        int count = toInt(buffer, offset + 4, TYPE_LONG);
+        switch (tag) {
+            case TAG_ImageWidth: {
+                imageWidth = getEntryValue(type, buffer, offset);
+                break;
+            }
+            case TAG_ImageLength: {
+                imageLength = getEntryValue(type, buffer, offset);
+                break;
+            }
+            case TAG_BitsPerSample: {
+                if (type !is TYPE_SHORT) SWT.error(SWT.ERROR_INVALID_IMAGE);
+                bitsPerSample = new int[count];
+                getEntryValue(type, buffer, offset, bitsPerSample);
+                break;
+            }
+            case TAG_Compression: {
+                compression = getEntryValue(type, buffer, offset);
+                break;
+            }
+            case TAG_PhotometricInterpretation: {
+                photometricInterpretation = getEntryValue(type, buffer, offset);
+                break;
+            }
+            case TAG_StripOffsets: {
+                if (type !is TYPE_LONG && type !is TYPE_SHORT) SWT.error(SWT.ERROR_INVALID_IMAGE);
+                stripOffsets = new int[count];
+                getEntryValue(type, buffer, offset, stripOffsets);
+                break;
+            }
+            case TAG_SamplesPerPixel: {
+                if (type !is TYPE_SHORT) SWT.error(SWT.ERROR_INVALID_IMAGE);
+                samplesPerPixel = getEntryValue(type, buffer, offset);
+                /* Only the basic 1 and 3 values are supported */
+                if (samplesPerPixel !is 1 && samplesPerPixel !is 3) SWT.error(SWT.ERROR_UNSUPPORTED_DEPTH);
+                break;
+            }
+            case TAG_RowsPerStrip: {
+                rowsPerStrip = getEntryValue(type, buffer, offset);
+                break;
+            }
+            case TAG_StripByteCounts: {
+                stripByteCounts = new int[count];
+                getEntryValue(type, buffer, offset, stripByteCounts);
+                break;
+            }
+            case TAG_XResolution: {
+                /* Ignored */
+                break;
+            }
+            case TAG_YResolution: {
+                /* Ignored */
+                break;
+            }
+            case TAG_T4Options: {
+                if (type !is TYPE_LONG) SWT.error(SWT.ERROR_INVALID_IMAGE);
+                t4Options = getEntryValue(type, buffer, offset);
+                if ((t4Options & 0x1) is 1) {
+                    /* 2-dimensional coding is not supported */
+                    SWT.error(SWT.ERROR_UNSUPPORTED_FORMAT);
+                }
+                break;
+            }
+            case TAG_ResolutionUnit: {
+                /* Ignored */
+                break;
+            }
+            case TAG_ColorMap: {
+                if (type !is TYPE_SHORT) SWT.error(SWT.ERROR_INVALID_IMAGE);
+                /* Get the offset of the colorMap (use TYPE_LONG) */
+                colorMapOffset = getEntryValue(TYPE_LONG, buffer, offset);
+                break;
+            }
+            default:
+        }
+    }
+}
+
+public ImageData read()  {
+    /* Set TIFF default values */
+    bitsPerSample = [1];
+    colorMapOffset = NO_VALUE;
+    compression = 1;
+    imageLength = NO_VALUE;
+    imageWidth = NO_VALUE;
+    photometricInterpretation = NO_VALUE;
+    rowsPerStrip = Integer.MAX_VALUE;
+    samplesPerPixel = 1;
+    stripByteCounts = null;
+    stripOffsets = null;
+
+    byte[] buffer = new byte[2];
+    file.read(buffer);
+    int numberEntries = toInt(buffer, 0, TYPE_SHORT);
+    buffer = new byte[IFD_ENTRY_SIZE * numberEntries];
+    file.read(buffer);
+    parseEntries(buffer);
+
+    PaletteData palette = null;
+    depth = 0;
+    switch (photometricInterpretation) {
+        case 0:
+        case 1: {
+            /* Bilevel or Grayscale image */
+            palette = getGrayPalette();
+            depth = bitsPerSample[0];
+            break;
+        }
+        case 2: {
+            /* RGB image */
+            if (colorMapOffset !is NO_VALUE) SWT.error(SWT.ERROR_INVALID_IMAGE);
+            /* SamplesPerPixel 3 is the only value supported */
+            palette = getRGBPalette(bitsPerSample[0], bitsPerSample[1], bitsPerSample[2]);
+            depth = bitsPerSample[0] + bitsPerSample[1] + bitsPerSample[2];
+            break;
+        }
+        case 3: {
+            /* Palette Color image */
+            if (colorMapOffset is NO_VALUE) SWT.error(SWT.ERROR_INVALID_IMAGE);
+            palette = getColorMap();
+            depth = bitsPerSample[0];
+            break;
+        }
+        default: {
+            SWT.error(SWT.ERROR_INVALID_IMAGE);
+        }
+    }
+
+    ImageData image = ImageData.internal_new(
+            imageWidth,
+            imageLength,
+            depth,
+            palette,
+            1,
+            null,
+            0,
+            null,
+            null,
+            -1,
+            -1,
+            SWT.IMAGE_TIFF,
+            0,
+            0,
+            0,
+            0);
+    decodePixels(image);
+    return image;
+}
+
+int toInt(byte[] buffer, int i, int type) {
+    if (type is TYPE_LONG) {
+        return isLittleEndian ?
+        (buffer[i] & 0xFF) | ((buffer[i + 1] & 0xFF) << 8) | ((buffer[i + 2] & 0xFF) << 16) | ((buffer[i + 3] & 0xFF) << 24) :
+        (buffer[i + 3] & 0xFF) | ((buffer[i + 2] & 0xFF) << 8) | ((buffer[i + 1] & 0xFF) << 16) | ((buffer[i] & 0xFF) << 24);
+    }
+    if (type is TYPE_SHORT) {
+        return isLittleEndian ?
+        (buffer[i] & 0xFF) | ((buffer[i + 1] & 0xFF) << 8) :
+        (buffer[i + 1] & 0xFF) | ((buffer[i] & 0xFF) << 8);
+    }
+    /* Invalid type */
+    SWT.error(SWT.ERROR_INVALID_IMAGE);
+    return -1;
+}
+
+void write(int photometricInterpretation)  {
+    bool isRGB = photometricInterpretation is 2;
+    bool isColorMap = photometricInterpretation is 3;
+    bool isBiLevel = photometricInterpretation is 0 || photometricInterpretation is 1;
+
+    int imageWidth = image.width;
+    int imageLength = image.height;
+    int rowByteSize = image.bytesPerLine;
+
+    int numberEntries = isBiLevel ? 9 : 11;
+    int lengthDirectory = 2 + 12 * numberEntries + 4;
+    /* Offset following the header and the directory */
+    int nextOffset = 8 + lengthDirectory;
+
+    /* Extra space used by XResolution and YResolution values */
+    int extraBytes = 16;
+
+    int[] colorMap = null;
+    if (isColorMap) {
+        PaletteData palette = image.palette;
+        RGB[] rgbs = palette.getRGBs();
+        colorMap = formatColorMap(rgbs);
+        /* The number of entries of the Color Map must match the bitsPerSample field */
+        if (colorMap.length !is 3 * 1 << image.depth) SWT.error(SWT.ERROR_UNSUPPORTED_FORMAT);
+        /* Extra space used by ColorMap values */
+        extraBytes += colorMap.length * 2;
+    }
+    if (isRGB) {
+        /* Extra space used by BitsPerSample values */
+        extraBytes += 6;
+    }
+    /* TIFF recommends storing the data in strips of no more than 8 Ko */
+    byte[] data = image.data;
+    int[][] strips = new int[][](2);
+    int nbrRowsPerStrip = formatStrips(rowByteSize, imageLength, data, 8192, nextOffset, extraBytes, strips);
+    int[] stripOffsets = strips[0];
+    int[] stripByteCounts = strips[1];
+
+    int bitsPerSampleOffset = NO_VALUE;
+    if (isRGB) {
+        bitsPerSampleOffset = nextOffset;
+        nextOffset += 6;
+    }
+    int stripOffsetsOffset = NO_VALUE, stripByteCountsOffset = NO_VALUE;
+    int xResolutionOffset, yResolutionOffset, colorMapOffset = NO_VALUE;
+    int cnt = stripOffsets.length;
+    if (cnt > 1) {
+        stripOffsetsOffset = nextOffset;
+        nextOffset += 4 * cnt;
+        stripByteCountsOffset = nextOffset;
+        nextOffset += 4 * cnt;
+    }
+    xResolutionOffset = nextOffset;
+    nextOffset += 8;
+    yResolutionOffset = nextOffset;
+    nextOffset += 8;
+    if (isColorMap) {
+        colorMapOffset = nextOffset;
+        nextOffset += colorMap.length * 2;
+    }
+    /* TIFF header */
+    writeHeader();
+
+    /* Image File Directory */
+    ostr.writeShort(numberEntries);
+    writeEntry(TAG_ImageWidth, TYPE_LONG, 1, imageWidth);
+    writeEntry(TAG_ImageLength, TYPE_LONG, 1, imageLength);
+    if (isColorMap) writeEntry(TAG_BitsPerSample, TYPE_SHORT, 1, image.depth);
+    if (isRGB) writeEntry(TAG_BitsPerSample, TYPE_SHORT, 3, bitsPerSampleOffset);
+    writeEntry(TAG_Compression, TYPE_SHORT, 1, COMPRESSION_NONE);
+    writeEntry(TAG_PhotometricInterpretation, TYPE_SHORT, 1, photometricInterpretation);
+    writeEntry(TAG_StripOffsets, TYPE_LONG, cnt, cnt > 1 ? stripOffsetsOffset : stripOffsets[0]);
+    if (isRGB) writeEntry(TAG_SamplesPerPixel, TYPE_SHORT, 1, 3);
+    writeEntry(TAG_RowsPerStrip, TYPE_LONG, 1, nbrRowsPerStrip);
+    writeEntry(TAG_StripByteCounts, TYPE_LONG, cnt, cnt > 1 ? stripByteCountsOffset : stripByteCounts[0]);
+    writeEntry(TAG_XResolution, TYPE_RATIONAL, 1, xResolutionOffset);
+    writeEntry(TAG_YResolution, TYPE_RATIONAL, 1, yResolutionOffset);
+    if (isColorMap) writeEntry(TAG_ColorMap, TYPE_SHORT, colorMap.length, colorMapOffset);
+    /* Offset of next IFD (0 for last IFD) */
+    ostr.writeInt(0);
+
+    /* Values longer than 4 bytes Section */
+
+    /* BitsPerSample 8,8,8 */
+    if (isRGB) for (int i = 0; i < 3; i++) ostr.writeShort(8);
+    if (cnt > 1) {
+        for (int i = 0; i < cnt; i++) ostr.writeInt(stripOffsets[i]);
+        for (int i = 0; i < cnt; i++) ostr.writeInt(stripByteCounts[i]);
+    }
+    /* XResolution and YResolution set to 300 dpi */
+    for (int i = 0; i < 2; i++) {
+        ostr.writeInt(300);
+        ostr.writeInt(1);
+    }
+    /* ColorMap */
+    if (isColorMap) for (int i = 0; i < colorMap.length; i++) ostr.writeShort(colorMap[i]);
+
+    /* Image Data */
+    ostr.write(data);
+}
+
+void writeEntry(short tag, int type, int count, int value) {
+    ostr.writeShort(tag);
+    ostr.writeShort(type);
+    ostr.writeInt(count);
+    ostr.writeInt(value);
+}
+
+void writeHeader() {
+    /* little endian */
+    ostr.write(0x49);
+    ostr.write(0x49);
+
+    /* TIFF identifier */
+    ostr.writeShort(42);
+    /*
+    * Offset of the first IFD is chosen to be 8.
+    * It is word aligned and immediately after this header.
+    */
+    ostr.writeInt(8);
+}
+
+void writeToStream(LEDataOutputStream byteStream) {
+    ostr = byteStream;
+    int photometricInterpretation = -1;
+
+    /* Scanline pad must be 1 */
+    if (image.scanlinePad !is 1) SWT.error(SWT.ERROR_UNSUPPORTED_FORMAT);
+    switch (image.depth) {
+        case 1: {
+            /* Palette must be black and white or white and black */
+            PaletteData palette = image.palette;
+            RGB[] rgbs = palette.colors;
+            if (palette.isDirect || rgbs is null || rgbs.length !is 2) SWT.error(SWT.ERROR_UNSUPPORTED_FORMAT);
+            RGB rgb0 = rgbs[0];
+            RGB rgb1 = rgbs[1];
+            if (!(rgb0.red is rgb0.green && rgb0.green is rgb0.blue &&
+                rgb1.red is rgb1.green && rgb1.green is rgb1.blue &&
+                ((rgb0.red is 0x0 && rgb1.red is 0xFF) || (rgb0.red is 0xFF && rgb1.red is 0x0)))) {
+                SWT.error(SWT.ERROR_UNSUPPORTED_FORMAT);
+            }
+            /* 0 means a color index of 0 is imaged as white */
+            photometricInterpretation = image.palette.colors[0].red is 0xFF ? 0 : 1;
+            break;
+        }
+        case 4:
+        case 8: {
+            photometricInterpretation = 3;
+            break;
+        }
+        case 24: {
+            photometricInterpretation = 2;
+            break;
+        }
+        default: {
+            SWT.error(SWT.ERROR_UNSUPPORTED_FORMAT);
+        }
+    }
+    write(photometricInterpretation);
+}
+
+}