q3paintengine_svg.cpp

奇趣公司比较新的qt/emd版本

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#include <private/qpainter_p.h>
#include <private/qpaintengine_p.h>
#include "qfile.h"
#include "qimage.h"
#include "qlist.h"
#include "qmap.h"
#include "q3paintengine_svg_p.h"
#include "qpainter.h"
#include "qpixmap.h"
#include "qregexp.h"
#include "qtextstream.h"

#include <math.h>

static const double deg2rad = 0.017453292519943295769;        // pi/180
static const char piData[] = "version=\"1.0\" standalone=\"no\"";
static const char publicId[] = "-//W3C//DTD SVG 20001102//EN";
static const char systemId[] = "http://www.w3.org/TR/2000/CR-SVG-20001102/DTD/svg-20001102.dtd";

static QString qt_svg_compose_path(const QPainterPath &path);

struct QImgElement {
    QDomElement element;
    QImage image;
    Q_DUMMY_COMPARISON_OPERATOR(QImgElement)
};

struct QPixElement {
    QDomElement element;
    QPixmap pixmap;
    Q_DUMMY_COMPARISON_OPERATOR(QPixElement)
};

struct Q3SVGPaintEngineState {
    double textx, texty; // current text position
    int textalign; // text alignment
    Q_DUMMY_COMPARISON_OPERATOR(Q3SVGPaintEngineState)
};

typedef QList<QImgElement> ImageList;
typedef QList<QPixElement> PixmapList;
typedef QList<Q3SVGPaintEngineState> StateList;

enum ElementType {
    InvalidElement = 0,
    AnchorElement,
    CircleElement,
    ClipElement,
    CommentElement,
    DescElement,
    EllipseElement,
    GroupElement,
    ImageElement,
    LineElement,
    PolylineElement,
    PolygonElement,
    PathElement,
    RectElement,
    SvgElement,
    TextElement,
    TitleElement,
    TSpanElement
};

typedef QMap<QString,ElementType> QSvgTypeMap;
static QSvgTypeMap *qSvgTypeMap=0; // element types
static QMap<QString,QString> *qSvgColMap=0; // recognized color keyword names

class Q3SVGPaintEnginePrivate : public QPaintEnginePrivate
{
    Q_DECLARE_PUBLIC(Q3SVGPaintEngine)

public:
    Q3SVGPaintEnginePrivate()
        : dirtyTransform(false), dirtyStyle(false), currentClip(0),
          dev(0), wwidth(0), wheight(0) {}
    void appendChild(QDomElement &e, QPicturePrivate::PaintCommand c);
    void applyStyle(QDomElement *e, QPicturePrivate::PaintCommand c) const;
    void applyTransform(QDomElement *e) const;
    double parseLen(const QString &str, bool *ok=0, bool horiz=true) const;
    int lenToInt(const QDomNamedNodeMap &map, const QString &attr, int def = 0) const;
    double lenToDouble(const QDomNamedNodeMap &map, const QString &attr, int def = 0) const;
    bool play(const QDomNode &node, QPainter *p);
    void setTransform(const QString &tr, QPainter *p);
    void restoreAttributes(QPainter *p);
    void saveAttributes(QPainter *p);
    void setStyle(const QString &s, QPainter *p);
    void setStyleProperty(const QString &prop, const QString &val, QPen *pen, QFont *font,
                          int *talign, QPainter *p);
    void drawPath(const QString &data, QPainter *p);
    QColor parseColor(const QString &col);
    void init() {
        QDomImplementation domImpl;
        QDomDocumentType docType = domImpl.createDocumentType(QLatin1String("svg"), QLatin1String(publicId), QLatin1String(systemId));
        doc = domImpl.createDocument(QLatin1String("http://www.w3.org/2000/svg"), QLatin1String("svg"), docType);
        doc.insertBefore(doc.createProcessingInstruction(QLatin1String("xml"), QLatin1String(piData)), doc.firstChild());
        current = doc.documentElement();
        images.clear();
        pixmaps.clear();

        doc.documentElement().setAttribute(QLatin1String("xmlns:xlink"), QLatin1String("http://www.w3.org/1999/xlink"));
    }


    bool dirtyTransform;
    bool dirtyStyle;
    QRect brect; // bounding rectangle
    QDomDocument doc; // document tree
    QDomNode current;

    ImageList images; // old private
    PixmapList pixmaps;
    StateList stack;
    int currentClip;

//     QPoint curPt;
    Q3SVGPaintEngineState *curr;
//     QPainter *pt; // only used by recursive play() et al
    QPen cpen;
    QBrush cbrush;
    QFont cfont;
    QMatrix worldMatrix;
    const QPaintDevice *dev;
    int wwidth;
    int wheight;
};

Q3SVGPaintEngine::Q3SVGPaintEngine()
    : QPaintEngine(*(new Q3SVGPaintEnginePrivate), AllFeatures)
{
    Q_D(Q3SVGPaintEngine);
    d->init();
}

Q3SVGPaintEngine::Q3SVGPaintEngine(Q3SVGPaintEnginePrivate &dptr)
    : QPaintEngine(dptr, AllFeatures)
{
    Q_D(Q3SVGPaintEngine);
    d->init();
}

Q3SVGPaintEngine::~Q3SVGPaintEngine()
{
    delete qSvgTypeMap; qSvgTypeMap = 0;        // static
    delete qSvgColMap; qSvgColMap = 0;
}

bool Q3SVGPaintEngine::begin(QPaintDevice *pdev)
{
    Q_D(Q3SVGPaintEngine);
    d->dirtyTransform = d->dirtyStyle = false;
    d->dev = pdev;
    setActive(true);
    return true;
}

bool Q3SVGPaintEngine::end()
{
    Q_D(Q3SVGPaintEngine);
    d->dev = 0;
    setActive(false);
    return true;
}

void Q3SVGPaintEngine::updateState(const QPaintEngineState &state)
{
    QPaintEngine::DirtyFlags flags = state.state();
    if (flags & DirtyPen) updatePen(state.pen());
    if ((flags & DirtyBrush) || (flags & DirtyBrushOrigin))
        updateBrush(state.brush(), state.brushOrigin());
    if (flags & DirtyBackground) updateBackground(state.backgroundMode(), state.backgroundBrush());
    if (flags & DirtyFont) updateFont(state.font());
    if (flags & DirtyTransform) updateMatrix(state.matrix());
    if (flags & DirtyClipRegion) updateClipRegion(state.clipRegion(), state.clipOperation());
    if (flags & DirtyClipPath) updateClipPath(state.clipPath(), state.clipOperation());
}

void Q3SVGPaintEngine::updatePen(const QPen &pen)
{
    Q_D(Q3SVGPaintEngine);
    d->cpen = pen;
    d->dirtyStyle = true;
}

void Q3SVGPaintEngine::updateBrush(const QBrush &brush, const QPointF &)
{
    Q_D(Q3SVGPaintEngine);
    d->cbrush = brush;
    d->dirtyStyle = true;
}

void Q3SVGPaintEngine::updateFont(const QFont &font)
{
    Q_D(Q3SVGPaintEngine);
    d->cfont = font;
    d->dirtyStyle = true;
}

void Q3SVGPaintEngine::updateBackground(Qt::BGMode, const QBrush &)
{
    Q_D(Q3SVGPaintEngine);
    d->dirtyStyle = true;
}

void Q3SVGPaintEngine::updateMatrix(const QMatrix &matrix)
{
    Q_D(Q3SVGPaintEngine);
    d->dirtyTransform = true;
    d->worldMatrix = matrix;
//     d->wwidth = ps->ww;
//     d->wheight = ps->wh;
}

void Q3SVGPaintEngine::updateClipPath(const QPainterPath &path, Qt::ClipOperation op)
{
    Q_D(Q3SVGPaintEngine);
    if (op == Qt::NoClip)
        return;

    QDomElement e;
    d->currentClip++;
    e = d->doc.createElement(QLatin1String("clipPath"));
    e.setAttribute(QLatin1String("id"), QString(QLatin1String("clip%1")).arg(d->currentClip));

    QDomElement path_element = d->doc.createElement(QLatin1String("path"));
    path_element.setAttribute(QLatin1String("d"), qt_svg_compose_path(path));
    e.appendChild(path_element);

    d->appendChild(e, QPicturePrivate::PdcSetClipPath);
}

void Q3SVGPaintEngine::updateClipRegion(const QRegion &clipRegion, Qt::ClipOperation op)
{
    QPainterPath clipPath;
    clipPath.addRegion(clipRegion);
    updateClipPath(clipPath, op);
}

void Q3SVGPaintEngine::updateRenderHints(QPainter::RenderHints)
{
}

void Q3SVGPaintEngine::drawRect(const QRectF &r)
{
    Q_D(Q3SVGPaintEngine);
    QDomElement e;
    e = d->doc.createElement(QLatin1String("rect"));

    e.setAttribute(QLatin1String("x"), r.x());
    e.setAttribute(QLatin1String("y"), r.y());
    e.setAttribute(QLatin1String("width"), r.width());
    e.setAttribute(QLatin1String("height"), r.height());
    d->appendChild(e, QPicturePrivate::PdcDrawRect);
}

void Q3SVGPaintEngine::drawPoint(const QPointF &p)
{
    QLineF l(p, p);
    drawLines(&l, 1);
}

void Q3SVGPaintEngine::drawPoints(const QPointF *points, int pointCount)
{
    for (int i = 0; i < pointCount; ++i) {
        QLineF l(points[i], points[i]);
        drawLines(&l, 1);
    }
}

void Q3SVGPaintEngine::drawEllipse(const QRect &r)
{
    Q_D(Q3SVGPaintEngine);
    QDomElement e;

    if (r.width() == r.height()) {
        e = d->doc.createElement(QLatin1String("circle"));
        double cx = r.x() + (r.width() / 2.0);
        double cy = r.y() + (r.height() / 2.0);
        e.setAttribute(QLatin1String("cx"), cx);
        e.setAttribute(QLatin1String("cy"), cy);
        e.setAttribute(QLatin1String("r"), cx - r.x());
    } else {
        e = d->doc.createElement(QLatin1String("ellipse"));
        double cx = r.x() + (r.width() / 2.0);
        double cy = r.y() + (r.height() / 2.0);
        e.setAttribute(QLatin1String("cx"), cx);
        e.setAttribute(QLatin1String("cy"), cy);
        e.setAttribute(QLatin1String("rx"), cx - r.x());
        e.setAttribute(QLatin1String("ry"), cy - r.y());
    }
    d->appendChild(e, QPicturePrivate::PdcDrawEllipse);
}

void Q3SVGPaintEngine::drawLine(const QLineF &line)
{
    drawLines(&line, 1);
}

void Q3SVGPaintEngine::drawLines(const QLineF *lines, int lineCount)
{
    Q_D(Q3SVGPaintEngine);
    QDomElement e;

    for (int i = 0; i < lineCount; ++i) {
        e = d->doc.createElement(QLatin1String("line"));
        e.setAttribute(QLatin1String("x1"), lines[i].x1());
        e.setAttribute(QLatin1String("y1"), lines[i].y1());
        e.setAttribute(QLatin1String("x2"), lines[i].x2());
        e.setAttribute(QLatin1String("y2"), lines[i].y2());
        d->appendChild(e, QPicturePrivate::PdcDrawLineSegments);
    }
}

void Q3SVGPaintEngine::drawPath(const QPainterPath &path)
{
    Q_D(Q3SVGPaintEngine);
    QDomElement e = d->doc.createElement(QLatin1String("path"));
    e.setAttribute(QLatin1String("d"), qt_svg_compose_path(path));
    d->appendChild(e, QPicturePrivate::PdcDrawPath);
}

void Q3SVGPaintEngine::drawPolygon(const QPointF *points, int pointCount, PolygonDrawMode mode)
{
    Q_D(Q3SVGPaintEngine);
    QString str;
    if (mode == PolylineMode) {
        QDomElement e = d->doc.createElement(QLatin1String("polyline"));
        for (int i = 0; i < pointCount; ++i) {
            QString tmp;
            tmp.sprintf("%f %f ", points[i].x(), points[i].y());
            str += tmp;
        }
        e.setAttribute(QLatin1String("points"), str.trimmed());
        d->appendChild(e, QPicturePrivate::PdcDrawPolyline);
    } else {
        QDomElement e = d->doc.createElement(QLatin1String("polygon"));
        for (int i = 0; i < pointCount; ++i) {
            QString tmp;
            tmp.sprintf("%f %f ", points[i].x(), points[i].y());
            str += tmp;
        }
        e.setAttribute(QLatin1String("points"), str.trimmed());
        d->appendChild(e, QPicturePrivate::PdcDrawPolygon);
    }
}

void Q3SVGPaintEngine::drawPolygon(const QPoint *points, int pointCount, PolygonDrawMode mode)