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#include "qtiffhandler.h"

#include <qvariant.h>

#include <qdebug.h>

#include <qimage.h>

#include <qglobal.h>

extern "C" {

#include "tiffio.h"

}

QT_BEGIN_NAMESPACE

tsize_t qtiffReadProc(thandle_t fd, tdata_t buf, tsize_t size)

{

    QIODevice* device = static_cast<QTiffHandler*>(fd)->device();

    return device->isReadable() ? device->read(static_cast<char *>(buf), size) : -1;

}

tsize_t qtiffWriteProc(thandle_t fd, tdata_t buf, tsize_t size)

{

    return static_cast<QTiffHandler*>(fd)->device()->write(static_cast<char *>(buf), size);

}

toff_t qtiffSeekProc(thandle_t fd, toff_t off, int whence)

{

    QIODevice *device = static_cast<QTiffHandler*>(fd)->device();

    switch (whence) {

    case SEEK_SET:

        device->seek(off);

        break;

    case SEEK_CUR:

        device->seek(device->pos() + off);

        break;

    case SEEK_END:

        device->seek(device->size() + off);

        break;

    }

    return device->pos();

}

int qtiffCloseProc(thandle_t /*fd*/)

{

    return 0;

}

toff_t qtiffSizeProc(thandle_t fd)

{

    return static_cast<QTiffHandler*>(fd)->device()->size();

}

int qtiffMapProc(thandle_t /*fd*/, tdata_t* /*pbase*/, toff_t* /*psize*/)

{

    return 0;

}

void qtiffUnmapProc(thandle_t /*fd*/, tdata_t /*base*/, toff_t /*size*/)

{

}

// for 32 bits images

inline void rotate_right_mirror_horizontal(QImage *const image)// rotate right->mirrored horizontal

{

    const int height = image->height();

    const int width = image->width();

    QImage generated(/* width = */ height, /* height = */ width, image->format());

    const uint32 *originalPixel = reinterpret_cast<const uint32*>(image->bits());

    uint32 *const generatedPixels = reinterpret_cast<uint32*>(generated.bits());

    for (int row=0; row < height; ++row) {

        for (int col=0; col < width; ++col) {

            int idx = col * height + row;

            generatedPixels[idx] = *originalPixel;

            ++originalPixel;

        }

    }

    *image = generated;

}

inline void rotate_right_mirror_vertical(QImage *const image) // rotate right->mirrored vertical

{

    const int height = image->height();

    const int width = image->width();

    QImage generated(/* width = */ height, /* height = */ width, image->format());

    const int lastCol = width - 1;

    const int lastRow = height - 1;

    const uint32 *pixel = reinterpret_cast<const uint32*>(image->bits());

    uint32 *const generatedBits = reinterpret_cast<uint32*>(generated.bits());

    for (int row=0; row < height; ++row) {

        for (int col=0; col < width; ++col) {

            int idx = (lastCol - col) * height + (lastRow - row);

            generatedBits[idx] = *pixel;

            ++pixel;

        }

    }

    *image = generated;

}

QTiffHandler::QTiffHandler() : QImageIOHandler()

{

    compression = NoCompression;

}

bool QTiffHandler::canRead() const

{

    if (canRead(device())) {

        setFormat("tiff");

        return true;

    }

    return false;

}

bool QTiffHandler::canRead(QIODevice *device)

{

    if (!device) {

        qWarning("QTiffHandler::canRead() called with no device");

        return false;

    }

    // current implementation uses TIFFClientOpen which needs to be

    // able to seek, so sequential devices are not supported

    QByteArray header = device->peek(4);

    return header == QByteArray::fromRawData("\x49\x49\x2A\x00", 4)

           || header == QByteArray::fromRawData("\x4D\x4D\x00\x2A", 4);

}

bool QTiffHandler::read(QImage *image)

{

    if (!canRead())

        return false;

    TIFF *const tiff = TIFFClientOpen("foo",

                                      "r",

                                      this,

                                      qtiffReadProc,

                                      qtiffWriteProc,

                                      qtiffSeekProc,

                                      qtiffCloseProc,

                                      qtiffSizeProc,

                                      qtiffMapProc,

                                      qtiffUnmapProc);

    if (!tiff) {

        return false;

    }

    uint32 width;

    uint32 height;

    uint16 photometric;

    if (!TIFFGetField(tiff, TIFFTAG_IMAGEWIDTH, &width)

        || !TIFFGetField(tiff, TIFFTAG_IMAGELENGTH, &height)

        || !TIFFGetField(tiff, TIFFTAG_PHOTOMETRIC, &photometric)) {

        TIFFClose(tiff);

        return false;

    }

    uint16 bitPerSample;

    bool grayscale = photometric == PHOTOMETRIC_MINISBLACK || photometric == PHOTOMETRIC_MINISWHITE;

    if (grayscale && bitPerSample == 1) {

        if (image->size() != QSize(width, height) || image->format() != QImage::Format_Mono)

            *image = QImage(width, height, QImage::Format_Mono);

        QVector<QRgb> colortable(2);

        if (photometric == PHOTOMETRIC_MINISBLACK) {

            colortable[0] = 0xff000000;

            colortable[1] = 0xffffffff;

        } else {

            colortable[0] = 0xffffffff;

            colortable[1] = 0xff000000;

        }

        image->setColorTable(colortable);

        if (!image->isNull()) {

            for (uint32 y=0; y<height; ++y) {

                if (TIFFReadScanline(tiff, image->scanLine(y), y, 0) < 0) {

                    TIFFClose(tiff);

                    return false;

                }

            }

        }

    } else {

        if ((grayscale || photometric == PHOTOMETRIC_PALETTE) && bitPerSample == 8) {

            if (image->size() != QSize(width, height) || image->format() != QImage::Format_Indexed8)

                *image = QImage(width, height, QImage::Format_Indexed8);

            if (!image->isNull()) {

                const uint16 tableSize = 256;

                QVector<QRgb> qtColorTable(tableSize);

                if (grayscale) {

                    for (int i = 0; i<tableSize; ++i) {

                        const int c = (photometric == PHOTOMETRIC_MINISBLACK) ? i : (255 - i);

                        qtColorTable[i] = qRgb(c, c, c);

                    }

                } else {

                    // create the color table

                    uint16 *redTable = static_cast<uint16 *>(qMalloc(tableSize * sizeof(uint16)));

                    uint16 *greenTable = static_cast<uint16 *>(qMalloc(tableSize * sizeof(uint16)));

                    uint16 *blueTable = static_cast<uint16 *>(qMalloc(tableSize * sizeof(uint16)));

                    if (!redTable || !greenTable || !blueTable) {

                        TIFFClose(tiff);

                        return false;

                    }

                    if (!TIFFGetField(tiff, TIFFTAG_COLORMAP, &redTable, &greenTable, &blueTable)) {

                        TIFFClose(tiff);

                        return false;

                    }

                    for (int i = 0; i<tableSize ;++i) {

                        const int red = redTable[i] / 257;

                        const int green = greenTable[i] / 257;

                        const int blue = blueTable[i] / 257;

                        qtColorTable[i] = qRgb(red, green, blue);

                    }

                }

                image->setColorTable(qtColorTable);

                for (uint32 y=0; y<height; ++y) {

                    if (TIFFReadScanline(tiff, image->scanLine(y), y, 0) < 0) {

                        TIFFClose(tiff);

                        return false;

                    }

                }

                // free redTable, greenTable and greenTable done by libtiff

            }

        } else {

            if (image->size() != QSize(width, height) || image->format() != QImage::Format_ARGB32)

                *image = QImage(width, height, QImage::Format_ARGB32);

            if (!image->isNull()) {

                const int stopOnError = 1;

                if (TIFFReadRGBAImageOriented(tiff, width, height, reinterpret_cast<uint32 *>(image->bits()), ORIENTATION_TOPLEFT, stopOnError)) {

                    for (uint32 y=0; y<height; ++y)

                        convert32BitOrder(image->scanLine(y), width);

                } else {

                    TIFFClose(tiff);

                    return false;

                }

            }

        }

    }

    if (image->isNull()) {

        TIFFClose(tiff);

        return false;

    }

    float resX = 0;

    float resY = 0;

    uint16 resUnit = RESUNIT_NONE;

    if (TIFFGetField(tiff, TIFFTAG_RESOLUTIONUNIT, &resUnit)

        && TIFFGetField(tiff, TIFFTAG_XRESOLUTION, &resX)

        && TIFFGetField(tiff, TIFFTAG_YRESOLUTION, &resY)) {

        switch(resUnit) {

        case RESUNIT_CENTIMETER:

            image->setDotsPerMeterX(qRound(resX * 100));

            image->setDotsPerMeterY(qRound(resY * 100));

            break;

        case RESUNIT_INCH:

            image->setDotsPerMeterX(qRound(resX * (100 / 2.54)));

            image->setDotsPerMeterY(qRound(resY * (100 / 2.54)));

            break;

        default:

            // do nothing as defaults have already

            // been set within the QImage class

            break;

        }

    }

    // rotate the image if the orientation is defined in the file

    uint16 orientationTag;

    if (TIFFGetField(tiff, TIFFTAG_ORIENTATION, &orientationTag)) {

        if (image->format() == QImage::Format_ARGB32) {

            // TIFFReadRGBAImageOriented() flip the image but does not rotate them

            switch (orientationTag) {

            case 5:

                rotate_right_mirror_horizontal(image);

                break;

            case 6:

                rotate_right_mirror_vertical(image);

                break;

            case 7:

                rotate_right_mirror_horizontal(image);

                break;

            case 8:

                rotate_right_mirror_vertical(image);

                break;

            }

        } else {

            switch (orientationTag) {

            case 1: // default orientation

                break;

            case 2: // mirror horizontal

                *image = image->mirrored(true, false);

                break;

            case 3: // mirror both

                *image = image->mirrored(true, true);

                break;

            case 4: // mirror vertical

                *image = image->mirrored(false, true);

                break;

            case 5: // rotate right mirror horizontal

                {

                    QMatrix transformation;

                    transformation.rotate(90);

                    *image = image->transformed(transformation);

                    *image = image->mirrored(true, false);

                    break;

                }

            case 6: // rotate right

                {

                    QMatrix transformation;

                    transformation.rotate(90);

                    *image = image->transformed(transformation);

                    break;

                }

            case 7: // rotate right, mirror vertical

                {

                    QMatrix transformation;

                    transformation.rotate(90);

                    *image = image->transformed(transformation);

                    *image = image->mirrored(false, true);

                    break;

                }

            case 8: // rotate left

                {

                    QMatrix transformation;

                    transformation.rotate(270);

                    *image = image->transformed(transformation);

                    break;

                }

            }

        }

    }

    TIFFClose(tiff);

    return true;

}

static bool checkGrayscale(const QVector<QRgb> &colorTable)

{

    if (colorTable.size() != 256)

        return false;

    const bool increasing = (colorTable.at(0) == 0xff000000);

    for (int i = 0; i < 256; ++i) {

        if (increasing && colorTable.at(i) != qRgb(i, i, i)

            || !increasing && colorTable.at(i) != qRgb(255 - i, 255 - i, 255 - i))

            return false;

    }

    return true;

}

bool QTiffHandler::write(const QImage &image)

{

    if (!device()->isWritable())

        return false;

    TIFF *const tiff = TIFFClientOpen("foo",

                                      "w",

                                      this,

                                      qtiffReadProc,

                                      qtiffWriteProc,

                                      qtiffSeekProc,

                                      qtiffCloseProc,

                                      qtiffSizeProc,

                                      qtiffMapProc,

                                      qtiffUnmapProc);

    if (!tiff)

        return false;

    const int width = image.width();

    const int height = image.height();

    if (!TIFFSetField(tiff, TIFFTAG_IMAGEWIDTH, width)

        || !TIFFSetField(tiff, TIFFTAG_IMAGELENGTH, height)

        || !TIFFSetField(tiff, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG)) {

        TIFFClose(tiff);

        return false;

    }

    // set the resolution

    bool  resolutionSet = false;

    const int dotPerMeterX = image.dotsPerMeterX();

    const int dotPerMeterY = image.dotsPerMeterY();

    if ((dotPerMeterX % 100) == 0

        && (dotPerMeterY % 100) == 0) {

        resolutionSet = TIFFSetField(tiff, TIFFTAG_RESOLUTIONUNIT, RESUNIT_CENTIMETER)

                        && TIFFSetField(tiff, TIFFTAG_XRESOLUTION, dotPerMeterX/100.0)

                        && TIFFSetField(tiff, TIFFTAG_YRESOLUTION, dotPerMeterY/100.0);

    } else {

        resolutionSet = TIFFSetField(tiff, TIFFTAG_RESOLUTIONUNIT, RESUNIT_INCH)

                        && TIFFSetField(tiff, TIFFTAG_XRESOLUTION, static_cast<float>(image.logicalDpiX()))

                        && TIFFSetField(tiff, TIFFTAG_YRESOLUTION, static_cast<float>(image.logicalDpiY()));

    }

    if (!resolutionSet) {

        TIFFClose(tiff);

        return false;

    }

    // configure image depth

    const QImage::Format format = image.format();

    if (format == QImage::Format_Mono || format == QImage::Format_MonoLSB) {

        uint16 photometric = PHOTOMETRIC_MINISBLACK;

        if (image.colorTable().at(0) == 0xffffffff)

            photometric = PHOTOMETRIC_MINISWHITE;

        if (!TIFFSetField(tiff, TIFFTAG_PHOTOMETRIC, photometric)

            || !TIFFSetField(tiff, TIFFTAG_COMPRESSION, compression == NoCompression ? COMPRESSION_NONE : COMPRESSION_CCITTRLE)

            || !TIFFSetField(tiff, TIFFTAG_BITSPERSAMPLE, 1)) {

            TIFFClose(tiff);

            return false;

        }

        // try to do the conversion in chunks no greater than 16 MB

        int chunks = (width * height / (1024 * 1024 * 16)) + 1;

        int chunkHeight = qMax(height / chunks, 1);

        int y = 0;

        while (y < height) {

            QImage chunk = image.copy(0, y, width, qMin(chunkHeight, height - y)).convertToFormat(QImage::Format_Mono);

            int chunkStart = y;

            int chunkEnd = y + chunk.height();

            while (y < chunkEnd) {

                if (TIFFWriteScanline(tiff, reinterpret_cast<uint32 *>(chunk.scanLine(y - chunkStart)), y) != 1) {

                    TIFFClose(tiff);

                    return false;

                }

                ++y;

            }

        }

        TIFFClose(tiff);

    } else if (format == QImage::Format_Indexed8) {

        const QVector<QRgb> colorTable = image.colorTable();

        bool isGrayscale = checkGrayscale(colorTable);

        if (isGrayscale) {

            uint16 photometric = PHOTOMETRIC_MINISBLACK;

            if (image.colorTable().at(0) == 0xffffffff)

                photometric = PHOTOMETRIC_MINISWHITE;

            if (!TIFFSetField(tiff, TIFFTAG_PHOTOMETRIC, photometric)

                    || !TIFFSetField(tiff, TIFFTAG_COMPRESSION, compression == NoCompression ? COMPRESSION_NONE : COMPRESSION_PACKBITS)

                    || !TIFFSetField(tiff, TIFFTAG_BITSPERSAMPLE, 8)) {

                TIFFClose(tiff);

                return false;

            }

        } else {

            if (!TIFFSetField(tiff, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_PALETTE)

                    || !TIFFSetField(tiff, TIFFTAG_COMPRESSION, compression == NoCompression ? COMPRESSION_NONE : COMPRESSION_PACKBITS)

                    || !TIFFSetField(tiff, TIFFTAG_BITSPERSAMPLE, 8)) {

                TIFFClose(tiff);

                return false;

            }

            //// write the color table

            // allocate the color tables

            uint16 *redTable = static_cast<uint16 *>(qMalloc(256 * sizeof(uint16)));

            uint16 *greenTable = static_cast<uint16 *>(qMalloc(256 * sizeof(uint16)));

            uint16 *blueTable = static_cast<uint16 *>(qMalloc(256 * sizeof(uint16)));

            if (!redTable || !greenTable || !blueTable) {

                TIFFClose(tiff);

                return false;

            }

            // set the color table

            const int tableSize = colorTable.size();

            Q_ASSERT(tableSize <= 256);

            for (int i = 0; i<tableSize; ++i) {

                const QRgb color = colorTable.at(i);

                redTable[i] = qRed(color) * 257;

                greenTable[i] = qGreen(color) * 257;

                blueTable[i] = qBlue(color) * 257;

            }

            const bool setColorTableSuccess = TIFFSetField(tiff, TIFFTAG_COLORMAP, redTable, greenTable, blueTable);

            qFree(redTable);

            qFree(greenTable);

            qFree(blueTable);

            if (!setColorTableSuccess) {