qpdf.cpp

奇趣公司比较新的qt/emd版本

    ort_min -= 1;
    ort_max += 1;

    start += off_min * offset + ort_min * orthogonal;
    orthogonal *= (ort_max - ort_min);
    int num = off_max - off_min;

    QPointF gradient_rect[4] = { start,
                                 start + orthogonal,
                                 start + num*offset,
                                 start + num*offset + orthogonal };
    qreal xmin = gradient_rect[0].x();
    qreal xmax = gradient_rect[0].x();
    qreal ymin = gradient_rect[0].y();
    qreal ymax = gradient_rect[0].y();
    for (int i = 1; i < 4; ++i) {
        xmin = qMin(xmin, gradient_rect[i].x());
        xmax = qMax(xmax, gradient_rect[i].x());
        ymin = qMin(ymin, gradient_rect[i].y());
        ymax = qMax(ymax, gradient_rect[i].y());
    }
    xmin -= 1000;
    xmax += 1000;
    ymin -= 1000;
    ymax += 1000;
    start -= QPointF(xmin, ymin);
    qreal factor_x = qreal(1<<24)/(xmax - xmin);
    qreal factor_y = qreal(1<<24)/(ymax - ymin);
    int xoff = (int)(orthogonal.x()*factor_x);
    int yoff = (int)(orthogonal.y()*factor_y);

    QByteArray triangles;
    triangles.resize(spread == QGradient::PadSpread ? 20*(stops.size()+2) : 20*num*stops.size());
    uchar *data = (uchar *) triangles.data();
    if (spread == QGradient::PadSpread) {
        if (off_min > 0 || off_max < 1) {
            // linear gradient outside of page
            const QGradientStop &current_stop = off_min > 0 ? stops.at(stops.size()-1) : stops.at(0);
            uint rgb = current_stop.second.rgba();
            int xpos = (int)(start.x()*factor_x);
            int ypos = (int)(start.y()*factor_y);
            writeTriangleLine(data, xpos, ypos, xoff, yoff, rgb, 0, alpha);
            start += num*offset;
            xpos = (int)(start.x()*factor_x);
            ypos = (int)(start.y()*factor_y);
            writeTriangleLine(data, xpos, ypos, xoff, yoff, rgb, 1, alpha);
        } else {
            int flag = 0;
            if (off_min < 0) {
                uint rgb = stops.at(0).second.rgba();
                int xpos = (int)(start.x()*factor_x);
                int ypos = (int)(start.y()*factor_y);
                writeTriangleLine(data, xpos, ypos, xoff, yoff, rgb, flag, alpha);
                start -= off_min*offset;
                flag = 1;
            }
            for (int s = 0; s < stops.size(); ++s) {
                const QGradientStop &current_stop = stops.at(s);
                uint rgb = current_stop.second.rgba();
                int xpos = (int)(start.x()*factor_x);
                int ypos = (int)(start.y()*factor_y);
                writeTriangleLine(data, xpos, ypos, xoff, yoff, rgb, flag, alpha);
                if (s < stops.size()-1)
                    start += offset*(stops.at(s+1).first - stops.at(s).first);
                flag = 1;
            }
            if (off_max > 1) {
                start += (off_max - 1)*offset;
                uint rgb = stops.at(stops.size()-1).second.rgba();
                int xpos = (int)(start.x()*factor_x);
                int ypos = (int)(start.y()*factor_y);
                writeTriangleLine(data, xpos, ypos, xoff, yoff, rgb, flag, alpha);
            }
        }
    } else {
        for (int i = 0; i < num; ++i) {
            uchar flag = 0;
            for (int s = 0; s < stops.size(); ++s) {
                uint rgb = stops.at(s).second.rgba();
                int xpos = (int)(start.x()*factor_x);
                int ypos = (int)(start.y()*factor_y);
                writeTriangleLine(data, xpos, ypos, xoff, yoff, rgb, flag, alpha);
                if (s < stops.size()-1)
                    start += offset*(stops.at(s+1).first - stops.at(s).first);
                flag = 1;
            }
        }
    }
    triangles.resize((char *)data - triangles.constData());

    QByteArray shader;
    QPdf::ByteStream s(&shader);
    s << "<<\n"
        "/ShadingType 4\n"
        "/ColorSpace " << (alpha ? "/DeviceGray\n" : "/DeviceRGB\n") <<
        "/AntiAlias true\n"
        "/BitsPerCoordinate 24\n"
        "/BitsPerComponent 8\n"
        "/BitsPerFlag 8\n"
        "/Decode [" << xmin << xmax << ymin << ymax << (alpha ? "0 1]\n" : "0 1 0 1 0 1]\n") <<
        "/AntiAlias true\n"
        "/Length " << triangles.length() << "\n"
        ">>\n"
        "stream\n" << triangles << "endstream\n"
        "endobj\n";
    return shader;
}
#endif

static void moveToHook(qfixed x, qfixed y, void *data)
{
    QPdf::Stroker *t = (QPdf::Stroker *)data;
    if (!t->first)
        *t->stream << "h\n";
    if (!t->cosmeticPen)
        t->matrix.map(x, y, &x, &y);
    *t->stream << x << y << "m\n";
    t->first = false;
}

static void lineToHook(qfixed x, qfixed y, void *data)
{
    QPdf::Stroker *t = (QPdf::Stroker *)data;
    if (!t->cosmeticPen)
        t->matrix.map(x, y, &x, &y);
    *t->stream << x << y << "l\n";
}

static void cubicToHook(qfixed c1x, qfixed c1y,
                        qfixed c2x, qfixed c2y,
                        qfixed ex, qfixed ey,
                        void *data)
{
    QPdf::Stroker *t = (QPdf::Stroker *)data;
    if (!t->cosmeticPen) {
        t->matrix.map(c1x, c1y, &c1x, &c1y);
        t->matrix.map(c2x, c2y, &c2x, &c2y);
        t->matrix.map(ex, ey, &ex, &ey);
    }
    *t->stream << c1x << c1y
               << c2x << c2y
               << ex << ey
               << "c\n";
}

QPdf::Stroker::Stroker()
    : dashStroker(&basicStroker)
{
    stroker = &basicStroker;
    basicStroker.setMoveToHook(moveToHook);
    basicStroker.setLineToHook(lineToHook);
    basicStroker.setCubicToHook(cubicToHook);
    cosmeticPen = true;
    basicStroker.setStrokeWidth(.1);
}

void QPdf::Stroker::setPen(const QPen &pen)
{
    if (pen.style() == Qt::NoPen) {
        stroker = 0;
        return;
    }
    qreal w = pen.widthF();
    bool zeroWidth = w < 0.0001;
    cosmeticPen = pen.isCosmetic();
    if (zeroWidth)
        w = .1;

    basicStroker.setStrokeWidth(w);
    basicStroker.setCapStyle(pen.capStyle());
    basicStroker.setJoinStyle(pen.joinStyle());
    basicStroker.setMiterLimit(pen.miterLimit());

    QVector<qreal> dashpattern = pen.dashPattern();
    if (zeroWidth) {
        for (int i = 0; i < dashpattern.size(); ++i)
            dashpattern[i] *= 10.;
    }
    if (!dashpattern.isEmpty()) {
        dashStroker.setDashPattern(dashpattern);
        dashStroker.setDashOffset(pen.dashOffset());
        stroker = &dashStroker;
    } else {
        stroker = &basicStroker;
    }
}

void QPdf::Stroker::strokePath(const QPainterPath &path)
{
    if (!stroker)
        return;
    first = true;

    stroker->strokePath(path, this, cosmeticPen ? matrix : QTransform());
    *stream << "h f\n";
}

QByteArray QPdf::ascii85Encode(const QByteArray &input)
{
    int isize = input.size()/4*4;
    QByteArray output;
    output.resize(input.size()*5/4+7);
    char *out = output.data();
    const uchar *in = (const uchar *)input.constData();
    for (int i = 0; i < isize; i += 4) {
        uint val = (((uint)in[i])<<24) + (((uint)in[i+1])<<16) + (((uint)in[i+2])<<8) + (uint)in[i+3];
        if (val == 0) {
            *out = 'z';
            ++out;
        } else {
            char base[5];
            base[4] = val % 85;
            val /= 85;
            base[3] = val % 85;
            val /= 85;
            base[2] = val % 85;
            val /= 85;
            base[1] = val % 85;
            val /= 85;
            base[0] = val % 85;
            *(out++) = base[0] + '!';
            *(out++) = base[1] + '!';
            *(out++) = base[2] + '!';
            *(out++) = base[3] + '!';
            *(out++) = base[4] + '!';
        }
    }
    //write the last few bytes
    int remaining = input.size() - isize;
    if (remaining) {
        uint val = 0;
        for (int i = isize; i < input.size(); ++i)
            val = (val << 8) + in[i];
        val <<= 8*(4-remaining);
        char base[5];
        base[4] = val % 85;
        val /= 85;
        base[3] = val % 85;
        val /= 85;
        base[2] = val % 85;
        val /= 85;
        base[1] = val % 85;
        val /= 85;
        base[0] = val % 85;
        for (int i = 0; i < remaining+1; ++i)
            *(out++) = base[i] + '!';
    }
    *(out++) = '~';
    *(out++) = '>';
    output.resize(out-output.data());
    return output;
}

const char *QPdf::toHex(ushort u, char *buffer)
{
    int i = 3;
    while (i >= 0) {
        ushort hex = (u & 0x000f);
        if (hex < 0x0a)
            buffer[i] = '0'+hex;
        else
            buffer[i] = 'A'+(hex-0x0a);
        u = u >> 4;
        i--;
    }
    buffer[4] = '\0';
    return buffer;
}

const char *QPdf::toHex(uchar u, char *buffer)
{
    int i = 1;
    while (i >= 0) {
        ushort hex = (u & 0x000f);
        if (hex < 0x0a)
            buffer[i] = '0'+hex;
        else
            buffer[i] = 'A'+(hex-0x0a);
        u = u >> 4;
        i--;
    }
    buffer[2] = '\0';
    return buffer;
}

#define Q_MM(n) int((n * 720 + 127) / 254)
#define Q_IN(n) int(n * 72)

static const QPdf::PaperSize paperSizes[QPrinter::NPageSize] =
{
    {  Q_MM(210), Q_MM(297) },      // A4
    {  Q_MM(176), Q_MM(250) },      // B5
    {  Q_IN(8.5), Q_IN(11) },       // Letter
    {  Q_IN(8.5), Q_IN(14) },       // Legal
    {  Q_IN(7.5), Q_IN(10) },       // Executive
    {  Q_MM(841), Q_MM(1189) },     // A0
    {  Q_MM(594), Q_MM(841) },      // A1
    {  Q_MM(420), Q_MM(594) },      // A2
    {  Q_MM(297), Q_MM(420) },      // A3
    {  Q_MM(148), Q_MM(210) },      // A5
    {  Q_MM(105), Q_MM(148) },      // A6
    {  Q_MM(74), Q_MM(105)},        // A7
    {  Q_MM(52), Q_MM(74) },        // A8
    {  Q_MM(37), Q_MM(52) },        // A9
    {  Q_MM(1000), Q_MM(1414) },    // B0
    {  Q_MM(707), Q_MM(1000) },     // B1
    {  Q_MM(31), Q_MM(44) },        // B10
    {  Q_MM(500), Q_MM(707) },      // B2
    {  Q_MM(353), Q_MM(500) },      // B3
    {  Q_MM(250), Q_MM(353) },      // B4
    {  Q_MM(125), Q_MM(176) },      // B6
    {  Q_MM(88), Q_MM(125) },       // B7
    {  Q_MM(62), Q_MM(88) },        // B8
    {  Q_MM(44), Q_MM(62) },        // B9
    {  Q_MM(162),    Q_MM(229) },   // C5E
    {  Q_IN(4.125),  Q_IN(9.5) },   // Comm10E
    {  Q_MM(110),    Q_MM(220) },   // DLE
    {  Q_IN(8.5),    Q_IN(13) },    // Folio
    {  Q_IN(17),     Q_IN(11) },    // Ledger
    {  Q_IN(11),     Q_IN(17) }     // Tabloid
};

static const char * const psToStr[QPrinter::NPageSize+1] =
{
    "A4", "B5", "Letter", "Legal", "Executive",
    "A0", "A1", "A2", "A3", "A5", "A6", "A7", "A8", "A9", "B0", "B1",
    "B10", "B2", "B3", "B4", "B6", "B7", "B8", "B9", "C5E", "Comm10E",
    "DLE", "Folio", "Ledger", "Tabloid", 0
};

QPdf::PaperSize QPdf::paperSize(QPrinter::PageSize pageSize)
{
    return paperSizes[pageSize];
}

const char *QPdf::paperSizeToString(QPrinter::PageSize pageSize)
{
    return psToStr[pageSize];
}


QByteArray QPdf::stripSpecialCharacters(const QByteArray &string)
{
    QByteArray s = string;
    s.replace(" ", "");
    s.replace("(", "");
    s.replace(")", "");
    s.replace("<", "");
    s.replace(">", "");
    s.replace("[", "");
    s.replace("]", "");
    s.replace("{", "");
    s.replace("}", "");
    s.replace("/", "");
    s.replace("%", "");
    return s;
}


// -------------------------- base engine, shared code between PS and PDF -----------------------

QPdfBaseEngine::QPdfBaseEngine(QPdfBaseEnginePrivate &dd, PaintEngineFeatures f)
    : QPaintEngine(dd, f)
{
    Q_D(QPdfBaseEngine);
#if !defined(QT_NO_CUPS) && !defined(QT_NO_LIBRARY)
    if (QCUPSSupport::isAvailable()) {
        QCUPSSupport cups;
        const cups_dest_t* printers = cups.availablePrinters();
        int prnCount = cups.availablePrintersCount();

        for (int i = 0; i <  prnCount; ++i) {
            if (printers[i].is_default) {
                d->printerName = QString::fromLocal8Bit(printers[i].name);
                break;
            }
        }

    } else
#endif
    {
        d->printerName = QString::fromLocal8Bit(qgetenv("PRINTER"));
        if (d->printerName.isEmpty())
            d->printerName = QString::fromLocal8Bit(qgetenv("LPDEST"));
        if (d->printerName.isEmpty())
            d->printerName = QString::fromLocal8Bit(qgetenv("NPRINTER"));
        if (d->printerName.isEmpty())
            d->printerName = QString::fromLocal8Bit(qgetenv("NGPRINTER"));
    }
}

void QPdfBaseEngine::drawPoints (const QPointF *points, int pointCount)
{
    Q_D(QPdfBaseEngine);
    if (!points || !d->hasPen)
        return;

    QPainterPath p;
    for (int i=0; i!=pointCount;++i) {
        p.moveTo(points[i]);
        p.lineTo(points[i] + QPointF(0, 0.001));
    }
    drawPath(p);
}

void QPdfBaseEngine::drawLines (const QLineF *lines, int lineCount)
{
    if (!lines)
        return;

    QPainterPath p;
    for (int i=0; i!=lineCount;++i) {
        p.moveTo(lines[i].p1());
        p.lineTo(lines[i].p2());
    }
    drawPath(p);
}

void QPdfBaseEngine::drawRects (const QRectF *rects, int rectCount)
{
    if (!rects)
        return;

    Q_D(QPdfBaseEngine);
    if (d->clipEnabled && d->allClipped)
        return;
    if (!d->hasPen && !d->hasBrush)
        return;

    QBrush penBrush = d->pen.brush();
    if (d->simplePen || !d->hasPen) {
        // draw strokes natively in this case for better output
        if(!d->simplePen && !d->stroker.matrix.isIdentity())
            *d->currentPage << "q\n" << QPdf::generateMatrix(d->stroker.matrix);
        for (int i = 0; i < rectCount; ++i)
            *d->currentPage << rects[i].x() << rects[i].y() << rects[i].width() << rects[i].height() << "re\n";
        *d->currentPage << (d->hasPen ? (d->hasBrush ? "B\n" : "S\n") : "f\n");
        if(!d->simplePen && !d->stroker.matrix.isIdentity())
            *d->currentPage << "Q\n";
    } else {
        QPainterPath p;
        for (int i=0; i!=rectCount; ++i)
            p.addRect(rects[i]);
        drawPath(p);
    }
}

void QPdfBaseEngine::drawPolygon(const QPointF *points, int pointCount, PolygonDrawMode mode)
{
    if (!points || !pointCount)
        return;
    Q_D(QPdfBaseEngine);