qpaintengine_x11.cpp

奇趣公司比较新的qt/emd版本

    if (d->has_pattern || d->has_texture) {
        if (bs == Qt::TexturePattern) {
            d->brush_pm = d->cbrush.texture();
#if !defined(QT_NO_XRENDER)
            if (X11->use_xrender) {
                XRenderPictureAttributes attrs;
                attrs.repeat = true;
                XRenderChangePicture(d->dpy, d->brush_pm.x11PictureHandle(), CPRepeat, &attrs);
                if (d->brush_pm.data->mask_picture)
                    XRenderChangePicture(d->dpy, d->brush_pm.data->mask_picture, CPRepeat, &attrs);
            }
#endif
        } else {
            d->brush_pm = qt_pixmapForBrush(bs, true);
        }
        d->brush_pm.x11SetScreen(d->scrn);
        if (d->brush_pm.depth() == 1) {
            mask |= GCStipple;
            vals.stipple = d->brush_pm.handle();
            s = FillStippled;
#if !defined(QT_NO_XRENDER)
            if (X11->use_xrender) {
                d->bitmap_texture = QPixmap(d->brush_pm.size());
                d->bitmap_texture.fill(Qt::transparent);

                ::Picture src  = X11->getSolidFill(d->scrn, d->cbrush.color());
                XRenderComposite(d->dpy, PictOpSrc, src, d->brush_pm.x11PictureHandle(),
                                 d->bitmap_texture.x11PictureHandle(),
                                 0, 0, d->brush_pm.width(), d->brush_pm.height(),
                                 0, 0, d->brush_pm.width(), d->brush_pm.height());

                XRenderPictureAttributes attrs;
                attrs.repeat = true;
                XRenderChangePicture(d->dpy, d->bitmap_texture.x11PictureHandle(), CPRepeat, &attrs);

                d->current_brush = d->bitmap_texture.x11PictureHandle();
            }
#endif
        } else {
            mask |= GCTile;
#ifndef QT_NO_XRENDER
            if (d->pdev_depth == 32 && d->brush_pm.depth() != 32)
                d->brush_pm.data->convertToARGB32();
#endif
            vals.tile = (d->brush_pm.depth() == d->pdev_depth
                         ? d->brush_pm.handle()
                         : d->brush_pm.data->x11ConvertToDefaultDepth());
            s = FillTiled;
#if !defined(QT_NO_XRENDER)
            d->current_brush = d->cbrush.texture().x11PictureHandle();
#endif
        }

        mask |= GCTileStipXOrigin | GCTileStipYOrigin;
        vals.ts_x_origin = qRound(origin.x());
        vals.ts_y_origin = qRound(origin.y());
    }
#if !defined(QT_NO_XRENDER)
    else if (d->has_alpha_brush) {
        d->current_brush = X11->getSolidFill(d->scrn, d->cbrush.color());
    }
#endif

    vals.fill_style = s;
    XChangeGC(d->dpy, d->gc_brush, mask, &vals);
    if (!d->has_clipping) {
        QRegion sysClip = systemClip();
        if (!sysClip.isEmpty())
            x11SetClipRegion(d->dpy, d->gc_brush, 0, d->picture, sysClip);
        else
            x11ClearClipRegion(d->dpy, d->gc_brush, 0, d->picture);
    }
}

void QX11PaintEngine::drawEllipse(const QRect &rect)
{
    Q_D(QX11PaintEngine);
    QRect devclip(SHRT_MIN, SHRT_MIN, SHRT_MAX*2 - 1, SHRT_MAX*2 - 1);
    QRect r(rect);
    if (d->txop == QTransform::TxTranslate)
        r.translate(qRound(d->matrix.dx()), qRound(d->matrix.dy()));
    if (d->use_path_fallback || devclip.intersected(r) != r) {
        QPainterPath path;
        path.addEllipse(rect);
        drawPath(path);
        return;
    }

    int x = r.x();
    int y = r.y();
    int w = r.width();
    int h = r.height();
    if (w < 1 || h < 1)
        return;
    if (w == 1 && h == 1) {
        XDrawPoint(d->dpy, d->hd, d->has_pen ? d->gc : d->gc_brush, x, y);
        return;
    }
    d->setupAdaptedOrigin(rect.topLeft());
    if (d->has_brush) {          // draw filled ellipse
        if (!d->has_pen) {
            XFillArc(d->dpy, d->hd, d->gc_brush, x, y, w-1, h-1, 0, 360*64);
            XDrawArc(d->dpy, d->hd, d->gc_brush, x, y, w-1, h-1, 0, 360*64);
            return;
        } else{
            XFillArc(d->dpy, d->hd, d->gc_brush, x, y, w, h, 0, 360*64);
        }
    }
    if (d->has_pen)                // draw outline
        XDrawArc(d->dpy, d->hd, d->gc, x, y, w, h, 0, 360*64);
    d->resetAdaptedOrigin();
}



void QX11PaintEnginePrivate::fillPolygon_translated(const QPointF *polygonPoints, int pointCount,
                                                    QX11PaintEnginePrivate::GCMode gcMode,
                                                    QPaintEngine::PolygonDrawMode mode)
{

    QVarLengthArray<QPointF> translated_points(pointCount);
    QPointF offset(matrix.dx(), matrix.dy());
    for (int i = 0; i < pointCount; ++i)
        translated_points[i] = polygonPoints[i] + offset;
    fillPolygon_dev(translated_points.data(), pointCount, gcMode, mode);
}

#ifndef QT_NO_XRENDER
static void qt_XRenderCompositeTrapezoids(Display *dpy,
                                          int op,
                                          Picture src,
                                          Picture dst,
                                          _Xconst XRenderPictFormat *maskFormat,
                                          int xSrc,
                                          int ySrc,
                                          const XTrapezoid *traps, int size)
{
    const int MAX_TRAPS = 50000;
    while (size) {
        int to_draw = size;
        if (to_draw > MAX_TRAPS)
            to_draw = MAX_TRAPS;
        XRenderCompositeTrapezoids(dpy, op, src, dst,
                                   maskFormat,
                                   xSrc, ySrc,
                                   traps, to_draw);
        size -= to_draw;
        traps += to_draw;
    }
}
#endif

void QX11PaintEnginePrivate::fillPolygon_dev(const QPointF *polygonPoints, int pointCount,
                                             QX11PaintEnginePrivate::GCMode gcMode,
                                             QPaintEngine::PolygonDrawMode mode)
{
    int clippedCount = 0;
    qt_float_point *clippedPoints = 0;

#ifndef QT_NO_XRENDER
    //can change if we switch to pen if gcMode != BrushGC
    bool has_fill_texture = has_texture;
    bool has_fill_pattern = has_pattern;
    ::Picture src;
#endif
    QBrush fill;
    GC fill_gc;
    if (gcMode == BrushGC) {
        fill = cbrush;
        fill_gc = gc_brush;
#ifndef QT_NO_XRENDER
        if (current_brush)
            src = current_brush;
        else
            src = X11->getSolidFill(scrn, fill.color());
#endif
    } else {
        fill = QBrush(cpen.brush());
        fill_gc = gc;
#ifndef QT_NO_XRENDER
        //we use the pens brush
        has_fill_texture = (fill.style() == Qt::TexturePattern);
        has_fill_pattern = (fill.style() >= Qt::Dense1Pattern && fill.style() <= Qt::DiagCrossPattern);
        if (has_fill_texture)
            src = fill.texture().x11PictureHandle();
        else if (has_fill_pattern)
            src = getPatternFill(scrn, fill);
        else
            src = X11->getSolidFill(scrn, fill.color());
#endif
    }

    polygonClipper.clipPolygon((qt_float_point *) polygonPoints, pointCount,
                               &clippedPoints, &clippedCount);

#ifndef QT_NO_XRENDER
    bool solid_fill = fill.color().alpha() == 255;
    if (has_fill_texture && fill.texture().depth() == 1 && solid_fill) {
        has_fill_texture = false;
        has_fill_pattern = true;
    }

    bool antialias = render_hints & QPainter::Antialiasing;

    if (X11->use_xrender
        && picture
        && !has_fill_pattern
        && (clippedCount > 0)
        && (fill.style() != Qt::NoBrush)
        && (has_fill_texture && fill.texture().hasAlpha() || antialias || !solid_fill || has_alpha_pen != has_alpha_brush))
    {
        QRect br = tessellator->tessellate((QPointF *)clippedPoints, clippedCount,
                                              mode == QPaintEngine::WindingMode);
        if (tessellator->size > 0) {
            XRenderPictureAttributes attrs;
            attrs.poly_edge = antialias ? PolyEdgeSmooth : PolyEdgeSharp;
            XRenderChangePicture(dpy, picture, CPPolyEdge, &attrs);

            if (has_fill_texture) {
                if (fill.texture().depth() == 1) {
                    for (int i=0; i < tessellator->size; ++i) {
                        int x_offset = int(XFixedToDouble(tessellator->traps[i].left.p1.x) - bg_origin.x());
                        int y_offset = int(XFixedToDouble(tessellator->traps[i].left.p1.y) - bg_origin.y());
                        XRenderCompositeTrapezoids(dpy, composition_mode, src, picture,
                                                   antialias ? XRenderFindStandardFormat(dpy, PictStandardA8) : 0,
                                                   x_offset, y_offset,
                                                   tessellator->traps + i, 1);
                    }
                } else {
                    int mask_w = br.width() + (br.x() > 0 ? br.x() : 0);
                    int mask_h = br.height() + (br.y() > 0 ? br.y() : 0);
                    Pixmap mask = XCreatePixmap (dpy, RootWindow(dpy, scrn),
                                                 mask_w, mask_h, antialias ? 8 : 1);
                    Picture mask_picture = XRenderCreatePicture (dpy, mask,
                                                                 antialias ? XRenderFindStandardFormat(dpy, PictStandardA8)
                                                                 : XRenderFindStandardFormat(dpy, PictStandardA1),
                                                                 CPPolyEdge, &attrs);
                    XRenderColor transparent;
                    transparent.red = 0;
                    transparent.green = 0;
                    transparent.blue = 0;
                    transparent.alpha = 0;
                    XRenderFillRectangle(dpy, PictOpSrc, mask_picture, &transparent, 0, 0, mask_w, mask_h);

                    Picture mask_src = X11->getSolidFill(scrn, Qt::white);
                    qt_XRenderCompositeTrapezoids(dpy, PictOpOver, mask_src, mask_picture,
                                                  antialias ? XRenderFindStandardFormat(dpy, PictStandardA8) : 0,
                                                  0, 0,
                                                  tessellator->traps, tessellator->size);
                    XRenderComposite(dpy, composition_mode, src, mask_picture, picture,
                                     qRound(bg_origin.x()), qRound(bg_origin.y()),
                                     0, 0,
                                     0, 0,
                                     mask_w, mask_h);
                    XFreePixmap(dpy, mask);
                    XRenderFreePicture(dpy, mask_picture);
                }
            } else {
                qt_XRenderCompositeTrapezoids(dpy, composition_mode, src, picture,
                                              antialias ? XRenderFindStandardFormat(dpy, PictStandardA8) : 0,
                                              0, 0,
                                              tessellator->traps, tessellator->size);
            }
            tessellator->done();
        }
    } else
#endif
        if (fill.style() != Qt::NoBrush) {
            if (clippedCount > 0) {
                QVarLengthArray<XPoint> xpoints(clippedCount);
                for (int i = 0; i < clippedCount; ++i) {
                    xpoints[i].x = qFloor(clippedPoints[i].x);
                    xpoints[i].y = qFloor(clippedPoints[i].y);
                }
                if (mode == QPaintEngine::WindingMode)
                    XSetFillRule(dpy, fill_gc, WindingRule);
                setupAdaptedOrigin(QPoint(xpoints[0].x, xpoints[0].y));
                XFillPolygon(dpy, hd, fill_gc,
                             xpoints.data(), clippedCount,
                             mode == QPaintEngine::ConvexMode ? Convex : Complex, CoordModeOrigin);
                resetAdaptedOrigin();
                if (mode == QPaintEngine::WindingMode)
                    XSetFillRule(dpy, fill_gc, EvenOddRule);
            }
        }
}

void QX11PaintEnginePrivate::strokePolygon_translated(const QPointF *polygonPoints, int pointCount, bool close)
{
    QVarLengthArray<QPointF> translated_points(pointCount);
    QPointF offset(matrix.dx(), matrix.dy());
    for (int i = 0; i < pointCount; ++i)
        translated_points[i] = polygonPoints[i] + offset;
    strokePolygon_dev(translated_points.data(), pointCount, close);
}

void QX11PaintEnginePrivate::strokePolygon_dev(const QPointF *polygonPoints, int pointCount, bool close)
{
    int clippedCount = 0;
    qt_float_point *clippedPoints = 0;
    polygonClipper.clipPolygon((qt_float_point *) polygonPoints, pointCount,
                               &clippedPoints, &clippedCount, close);

    if (clippedCount > 0) {
        QVarLengthArray<XPoint> xpoints(clippedCount);
        for (int i = 0; i < clippedCount; ++i) {
            xpoints[i].x = qFloor(clippedPoints[i].x);
            xpoints[i].y = qFloor(clippedPoints[i].y);
        }
        uint numberPoints = qMin(clippedCount, xlibMaxLinePoints);
        XPoint *pts = xpoints.data();
        XDrawLines(dpy, hd, gc, pts, numberPoints, CoordModeOrigin);
        pts += numberPoints;
        clippedCount -= numberPoints;
        numberPoints = qMin(clippedCount, xlibMaxLinePoints-1);
        while (clippedCount) {
            XDrawLines(dpy, hd, gc, pts-1, numberPoints+1, CoordModeOrigin);
            pts += numberPoints;
            clippedCount -= numberPoints;
            numberPoints = qMin(clippedCount, xlibMaxLinePoints-1);
        }
    }
}

void QX11PaintEngine::drawPolygon(const QPointF *polygonPoints, int pointCount, PolygonDrawMode mode)
{
    Q_D(QX11PaintEngine);
    if (d->use_path_fallback) {
        QPainterPath path(polygonPoints[0]);
        for (int i = 1; i < pointCount; ++i)
            path.lineTo(polygonPoints[i]);
        if (mode == PolylineMode) {
            QBrush oldBrush = d->cbrush;
            d->cbrush = QBrush(Qt::NoBrush);
            path.setFillRule(Qt::WindingFill);
            drawPath(path);
            d->cbrush = oldBrush;
        } else {
            path.setFillRule(mode == OddEvenMode ? Qt::OddEvenFill : Qt::WindingFill);
            path.closeSubpath();
            drawPath(path);
        }
        return;
    }
    if (mode != PolylineMode && d->has_brush)
        d->fillPolygon_translated(polygonPoints, pointCount, QX11PaintEnginePrivate::BrushGC, mode);

    if (d->has_pen)
        d->strokePolygon_translated(polygonPoints, pointCount, mode != PolylineMode);
}


void QX11PaintEnginePrivate::fillPath(const QPainterPath &path, QX11PaintEnginePrivate::GCMode gc_mode, bool transform)
{
    QList<QPolygonF> polys = path.toFillPolygons(transform ? matrix : QTransform());
    for (int i = 0; i < polys.size(); ++i) {
        fillPolygon_dev(polys.at(i).data(), polys.at(i).size(), gc_mode,
                        path.fillRule() == Qt::OddEvenFill ? QPaintEngine::OddEvenMode : QPaintEngine::WindingMode);
    }
}

void QX11PaintEngine::drawPath(const QPainterPath &path)
{
    Q_D(QX11PaintEngine);
    if (path.isEmpty())
        return;
    QTransform old_matrix = d->matrix;
    bool adjust_coords = !(d->render_hints & QPainter::Antialiasing) &&
                         (d->has_alpha_pen || (d->has_alpha_brush && d->has_pen && !d->has_alpha_pen)
                          || (d->cpen.style() > Qt::SolidLine));