qpdf.cpp

奇趣公司比较新的qt/emd版本

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#include "qplatformdefs.h"
#include <qdebug.h>
#include "qpdf_p.h"
#include <qfile.h>
#include <private/qmath_p.h>
#include "private/qcups_p.h"

extern int qt_defaultDpi();

#ifndef QT_NO_PRINTER

/* also adds a space at the end of the number */
const char *qt_real_to_string(qreal val, char *buf) {
    const char *ret = buf;
    if (val < 0) {
        *(buf++) = '-';
        val = -val;
    }
    int ival = (int) val;
    qreal frac = val - (qreal)ival;

    int ifrac = (int)(frac * 1000000);
    if (ifrac == 1000000) {
        ++ival;
        ifrac = 0;
    }
    char output[256];
    int i = 0;
    while (ival) {
        output[i] = '0' + (ival % 10);
        ++i;
        ival /= 10;
    }
    int fact = 100000;
    if (i == 0) {
        *(buf++) = '0';
    } else {
        while (i) {
            *(buf++) = output[--i];
            fact /= 10;
            ifrac /= 10;
        }
    }

    if (ifrac) {
        *(buf++) =  '.';
        while (fact) {
            *(buf++) = '0' + ((ifrac/fact) % 10);
            fact /= 10;
        }
    }
    *(buf++) = ' ';
    *buf = 0;
    return ret;
}

const char *qt_int_to_string(int val, char *buf) {
    const char *ret = buf;
    if (val < 0) {
        *(buf++) = '-';
        val = -val;
    }
    char output[256];
    int i = 0;
    while (val) {
        output[i] = '0' + (val % 10);
        ++i;
        val /= 10;
    }
    if (i == 0) {
        *(buf++) = '0';
    } else {
        while (i)
            *(buf++) = output[--i];
    }
    *(buf++) = ' ';
    *buf = 0;
    return ret;
}

#define QT_PATH_ELEMENT(elm)

QByteArray QPdf::generatePath(const QPainterPath &path, const QTransform &matrix, PathFlags flags)
{
    QByteArray result;
    if (!path.elementCount())
        return result;

    ByteStream s(&result);

    int start = -1;
    for (int i = 0; i < path.elementCount(); ++i) {
        const QPainterPath::Element &elm = path.elementAt(i);
        switch (elm.type) {
        case QPainterPath::MoveToElement:
            if (start >= 0
                && path.elementAt(start).x == path.elementAt(i-1).x
                && path.elementAt(start).y == path.elementAt(i-1).y)
                s << "h\n";
            s << matrix.map(QPointF(elm.x, elm.y)) << "m\n";
            start = i;
                break;
        case QPainterPath::LineToElement:
            s << matrix.map(QPointF(elm.x, elm.y)) << "l\n";
            break;
        case QPainterPath::CurveToElement:
            Q_ASSERT(path.elementAt(i+1).type == QPainterPath::CurveToDataElement);
            Q_ASSERT(path.elementAt(i+2).type == QPainterPath::CurveToDataElement);
            s << matrix.map(QPointF(elm.x, elm.y))
              << matrix.map(QPointF(path.elementAt(i+1).x, path.elementAt(i+1).y))
              << matrix.map(QPointF(path.elementAt(i+2).x, path.elementAt(i+2).y))
              << "c\n";
            i += 2;
            break;
        default:
            qFatal("QPdf::generatePath(), unhandled type: %d", elm.type);
        }
    }
    if (start >= 0
        && path.elementAt(start).x == path.elementAt(path.elementCount()-1).x
        && path.elementAt(start).y == path.elementAt(path.elementCount()-1).y)
        s << "h\n";

    Qt::FillRule fillRule = path.fillRule();

    const char *op = 0;
    switch (flags) {
    case ClipPath:
        op = (fillRule == Qt::WindingFill) ? "W n\n" : "W* n\n";
        break;
    case FillPath:
        op = (fillRule == Qt::WindingFill) ? "f\n" : "f*\n";
        break;
    case StrokePath:
        op = "S\n";
        break;
    case FillAndStrokePath:
        op = (fillRule == Qt::WindingFill) ? "B\n" : "B*\n";
        break;
    }
    s << op;
    return result;
}

QByteArray QPdf::generateMatrix(const QTransform &matrix)
{
    QByteArray result;
    ByteStream s(&result);
    s << matrix.m11()
      << matrix.m12()
      << matrix.m21()
      << matrix.m22()
      << matrix.dx()
      << matrix.dy()
      << "cm\n";
    return result;
}

QByteArray QPdf::generateDashes(const QPen &pen)
{
    QByteArray result;
    ByteStream s(&result);
    s << "[";

    QVector<qreal> dasharray = pen.dashPattern();
    qreal w = pen.widthF();
    if (w < 0.001)
        w = 1;
    for (int i = 0; i < dasharray.size(); ++i) {
        qreal dw = dasharray.at(i)*w;
        if (dw < 0.0001) dw = 0.0001;
        s << dw;
    }
    s << "]";
    //qDebug() << "dasharray: pen has" << dasharray;
    //qDebug() << "  => " << result;
    return result;
}



static const char* pattern_for_brush[] = {
    0, // NoBrush
    0, // SolidPattern
    "0 J\n"
    "6 w\n"
    "[] 0 d\n"
    "4 0 m\n"
    "4 8 l\n"
    "0 4 m\n"
    "8 4 l\n"
    "S\n", // Dense1Pattern

    "0 J\n"
    "2 w\n"
    "[6 2] 1 d\n"
    "0 0 m\n"
    "0 8 l\n"
    "8 0 m\n"
    "8 8 l\n"
    "S\n"
    "[] 0 d\n"
    "2 0 m\n"
    "2 8 l\n"
    "6 0 m\n"
    "6 8 l\n"
    "S\n"
    "[6 2] -3 d\n"
    "4 0 m\n"
    "4 8 l\n"
    "S\n", // Dense2Pattern

    "0 J\n"
    "2 w\n"
    "[6 2] 1 d\n"
    "0 0 m\n"
    "0 8 l\n"
    "8 0 m\n"
    "8 8 l\n"
    "S\n"
    "[2 2] -1 d\n"
    "2 0 m\n"
    "2 8 l\n"
    "6 0 m\n"
    "6 8 l\n"
    "S\n"
    "[6 2] -3 d\n"
    "4 0 m\n"
    "4 8 l\n"
    "S\n", // Dense3Pattern

    "0 J\n"
    "2 w\n"
    "[2 2] 1 d\n"
    "0 0 m\n"
    "0 8 l\n"
    "8 0 m\n"
    "8 8 l\n"
    "S\n"
    "[2 2] -1 d\n"
    "2 0 m\n"
    "2 8 l\n"
    "6 0 m\n"
    "6 8 l\n"
    "S\n"
    "[2 2] 1 d\n"
    "4 0 m\n"
    "4 8 l\n"
    "S\n", // Dense4Pattern

    "0 J\n"
    "2 w\n"
    "[2 6] -1 d\n"
    "0 0 m\n"
    "0 8 l\n"
    "8 0 m\n"
    "8 8 l\n"
    "S\n"
    "[2 2] 1 d\n"
    "2 0 m\n"
    "2 8 l\n"
    "6 0 m\n"
    "6 8 l\n"
    "S\n"
    "[2 6] 3 d\n"
    "4 0 m\n"
    "4 8 l\n"
    "S\n", // Dense5Pattern

    "0 J\n"
    "2 w\n"
    "[2 6] -1 d\n"
    "0 0 m\n"
    "0 8 l\n"
    "8 0 m\n"
    "8 8 l\n"
    "S\n"
    "[2 6] 3 d\n"
    "4 0 m\n"
    "4 8 l\n"
    "S\n", // Dense6Pattern

    "0 J\n"
    "2 w\n"
    "[2 6] -1 d\n"
    "0 0 m\n"
    "0 8 l\n"
    "8 0 m\n"
    "8 8 l\n"
    "S\n", // Dense7Pattern

    "1 w\n"
    "0 4 m\n"
    "8 4 l\n"
    "S\n", // HorPattern

    "1 w\n"
    "4 0 m\n"
    "4 8 l\n"
    "S\n", // VerPattern

    "1 w\n"
    "4 0 m\n"
    "4 8 l\n"
    "0 4 m\n"
    "8 4 l\n"
    "S\n", // CrossPattern

    "1 w\n"
    "-1 5 m\n"
    "5 -1 l\n"
    "3 9 m\n"
    "9 3 l\n"
    "S\n", // BDiagPattern

    "1 w\n"
    "-1 3 m\n"
    "5 9 l\n"
    "3 -1 m\n"
    "9 5 l\n"
    "S\n", // FDiagPattern

    "1 w\n"
    "-1 3 m\n"
    "5 9 l\n"
    "3 -1 m\n"
    "9 5 l\n"
    "-1 5 m\n"
    "5 -1 l\n"
    "3 9 m\n"
    "9 3 l\n"
    "S\n", // DiagCrossPattern
};

QByteArray QPdf::patternForBrush(const QBrush &b)
{
    int style = b.style();
    if (style > Qt::DiagCrossPattern)
        return QByteArray();
    return pattern_for_brush[style];
}

#ifdef USE_NATIVE_GRADIENTS
static void writeTriangleLine(uchar *&data, int xpos, int ypos, int xoff, int yoff, uint rgb, uchar flag, bool alpha)
{
    data[0] =  flag;
    data[1] = (uchar)(xpos >> 16);
    data[2] = (uchar)(xpos >> 8);
    data[3] = (uchar)(xpos >> 0);
    data[4] = (uchar)(ypos >> 16);
    data[5] = (uchar)(ypos >> 8);
    data[6] = (uchar)(ypos >> 0);
    data += 7;
    if (alpha) {
        *data++ = (uchar)qAlpha(rgb);
    } else {
        *data++ = (uchar)qRed(rgb);
        *data++ = (uchar)qGreen(rgb);
        *data++ = (uchar)qBlue(rgb);
    }
    xpos += xoff;
    ypos += yoff;
    data[0] =  flag;
    data[1] = (uchar)(xpos >> 16);
    data[2] = (uchar)(xpos >> 8);
    data[3] = (uchar)(xpos >> 0);
    data[4] = (uchar)(ypos >> 16);
    data[5] = (uchar)(ypos >> 8);
    data[6] = (uchar)(ypos >> 0);
    data += 7;
    if (alpha) {
        *data++ = (uchar)qAlpha(rgb);
    } else {
        *data++ = (uchar)qRed(rgb);
        *data++ = (uchar)qGreen(rgb);
        *data++ = (uchar)qBlue(rgb);
    }
}


QByteArray QPdf::generateLinearGradientShader(const QLinearGradient *gradient, const QPointF *page_rect, bool alpha)
{
    // generate list of triangles with colors
    QPointF start = gradient->start();
    QPointF stop = gradient->finalStop();
    QGradientStops stops = gradient->stops();
    QPointF offset = stop - start;
    QGradient::Spread spread = gradient->spread();

    if (gradient->spread() == QGradient::ReflectSpread) {
        offset *= 2;
        for (int i = stops.size() - 2; i >= 0; --i) {
            QGradientStop stop = stops.at(i);
            stop.first = 2. - stop.first;
            stops.append(stop);
        }
        for (int i = 0 ; i < stops.size(); ++i)
            stops[i].first /= 2.;
    }

    QPointF orthogonal(offset.y(), -offset.x());
    qreal length = offset.x()*offset.x() + offset.y()*offset.y();

    // find the max and min values in offset and orth direction that are needed to cover
    // the whole page
    int off_min = INT_MAX;
    int off_max = INT_MIN;
    qreal ort_min = INT_MAX;
    qreal ort_max = INT_MIN;
    for (int i = 0; i < 4; ++i) {
        qreal off = ((page_rect[i].x() - start.x()) * offset.x() + (page_rect[i].y() - start.y()) * offset.y())/length;
        qreal ort = ((page_rect[i].x() - start.x()) * orthogonal.x() + (page_rect[i].y() - start.y()) * orthogonal.y())/length;
        off_min = qMin(off_min, qFloor(off));
        off_max = qMax(off_max, qCeil(off));
        ort_min = qMin(ort_min, ort);
        ort_max = qMax(ort_max, ort);
    }