qpaintengine_x11.cpp

qt-x11-opensource-src-4.1.4.tar.gz源码

    // eliminate shared edges
    for (int i = 0; i < et.size(); ++i) {
	for (int k = i+1; k < et.size(); ++k) {
            const QEdge *edgeI = et.at(i);
            const QEdge *edgeK = et.at(k);
            if (edgeK->p1.y > edgeI->p1.y)
                break;
   	    if (edgeI->winding != edgeK->winding &&
                isEqual(edgeI->p1, edgeK->p1) && isEqual(edgeI->p2, edgeK->p2)
		) {
 		et.removeAt(k);
		et.removeAt(i);
		--i;
		break;
	    }
	}
    }

    if (ymax <= ymin)
	return;
    QList<const QEdge *> aet; 	    // edges that intersects the current scanline

//     if (ymin < 0)
// 	ymin = 0;
//     if (paintEventClipRegion) // don't scan more lines than we have to
// 	ymax = paintEventClipRegion->boundingRect().height();

#ifdef QT_DEBUG_TESSELATOR
    qDebug("==> ymin = %f, ymax = %f", ymin, ymax);
#endif // QT_DEBUG_TESSELATOR

    currentY = ymin; // used by the less than op
    for (qreal y = ymin; y < ymax;) {
	// fill active edge table with edges that intersect the current line
	for (int i = 0; i < et.size(); ++i) {
            const QEdge *edge = et.at(i);
            if (edge->p1.y > XDoubleToFixed(y))
                break;
            aet.append(edge);
            et.removeAt(i);
            --i;
	}

	// remove processed edges from active edge table
	for (int i = 0; i < aet.size(); ++i) {
	    if (aet.at(i)->p2.y <= XDoubleToFixed(y)) {
		aet.removeAt(i);
 		--i;
	    }
	}
        if (aet.size()%2 != 0) {
#ifndef QT_NO_DEBUG
            qWarning("QX11PaintEngine: aet out of sync - this should not happen.");
#endif
            return;
        }

	// done?
	if (!aet.size()) {
            if (!et.size()) {
                break;
	    } else {
 		y = XFixedToDouble(et.at(0)->p1.y);
                continue;
	    }
        }

        // calculate the next y where we have to start a new set of trapezoids
	qreal next_y(INT_MAX/256);
 	for (int i = 0; i < aet.size(); ++i) {
            const QEdge *edge = aet.at(i);
 	    if (XFixedToDouble(edge->p2.y) < next_y)
 		next_y = XFixedToDouble(edge->p2.y);
        }

	if (et.size() && next_y > XFixedToDouble(et.at(0)->p1.y))
	    next_y = XFixedToDouble(et.at(0)->p1.y);

        int aetSize = aet.size();
	for (int i = 0; i < aetSize; ++i) {
	    for (int k = i+1; k < aetSize; ++k) {
                const QEdge *edgeI = aet.at(i);
                const QEdge *edgeK = aet.at(k);
		qreal m1 = edgeI->m;
		qreal b1 = edgeI->b;
		qreal m2 = edgeK->m;
		qreal b2 = edgeK->b;

		if (qAbs(m1 - m2) < 0.001)
                    continue;

                // ### intersect is not calculated correctly when optimized with -O2 (gcc)
                volatile qreal intersect;
                if (!qIsFinite(b1))
                    intersect = (1.f / m2) * XFixedToDouble(edgeI->p1.x) + b2;
                else if (!qIsFinite(b2))
                    intersect = (1.f / m1) * XFixedToDouble(edgeK->p1.x) + b1;
                else
                    intersect = (b1*m1 - b2*m2) / (m1 - m2);

 		if (intersect > y && intersect < next_y)
		    next_y = intersect;
	    }
	}

        XFixed yf, next_yf;
        yf = qrealToXFixed(y);
        next_yf = qrealToXFixed(next_y);

        if (yf == next_yf) {
            y = currentY = next_y;
            continue;
        }

#ifdef QT_DEBUG_TESSELATOR
        qDebug("###> y = %f, next_y = %f, %d active edges", y, next_y, aet.size());
        qDebug("===> edges");
        dump_edges(et);
        qDebug("===> active edges");
        dump_edges(aet);
#endif
	// calc intersection points
 	QVarLengthArray<QIntersectionPoint> isects(aet.size()+1);
 	for (int i = 0; i < isects.size()-1; ++i) {
            const QEdge *edge = aet.at(i);
 	    isects[i].x = (edge->p1.x != edge->p2.x) ?
			  ((y - edge->b)*edge->m) : XFixedToDouble(edge->p1.x);
	    isects[i].edge = edge;
	}

	Q_ASSERT(isects.size()%2 == 1);

	// sort intersection points
 	qSort(&isects[0], &isects[isects.size()-1], compareIntersections);

        if (winding) {
            // winding fill rule
            for (int i = 0; i < isects.size()-1;) {
                int winding = 0;
                const QEdge *left = isects[i].edge;
                const QEdge *right = 0;
                winding += isects[i].edge->winding;
                for (++i; i < isects.size()-1 && winding != 0; ++i) {
                    winding += isects[i].edge->winding;
                    right = isects[i].edge;
                }
                if (!left || !right)
                    break;
                traps->append(toXTrapezoid(yf, next_yf, *left, *right));
            }
        } else {
            // odd-even fill rule
            for (int i = 0; i < isects.size()-2; i += 2)
                traps->append(toXTrapezoid(yf, next_yf, *isects[i].edge, *isects[i+1].edge));
        }
	y = currentY = next_y;
    }

#ifdef QT_DEBUG_TESSELATOR
    qDebug("==> number of trapezoids: %d - edge table size: %d\n", traps->size(), et.size());

    for (int i = 0; i < traps->size(); ++i)
        dump_trap(traps->at(i));
#endif

    // optimize by unifying trapezoids that share left/right lines
    // and have a common top/bottom edge
//     for (int i = 0; i < tps.size(); ++i) {
// 	for (int k = i+1; k < tps.size(); ++k) {
// 	    if (i != k && tps.at(i).right == tps.at(k).right
// 		&& tps.at(i).left == tps.at(k).left
// 		&& (tps.at(i).top == tps.at(k).bottom
// 		    || tps.at(i).bottom == tps.at(k).top))
// 	    {
// 		tps[i].bottom = tps.at(k).bottom;
// 		tps.removeAt(k);
//                 i = 0;
// 		break;
// 	    }
// 	}
//     }
}

#endif // !defined(QT_NO_XRENDER)


#ifndef QT_NO_XRENDER
static Picture getPatternFill(int screen, const QBrush &b, const QBrush &bg, bool opaque_bg)
{
    if (!X11->use_xrender)
        return XNone;

    XRenderColor color = X11->preMultiply(b.color());
    XRenderColor bg_color;

    if (opaque_bg)
        bg_color = X11->preMultiply(bg.color());
    else
        bg_color = X11->preMultiply(QColor(0, 0, 0, 0));

    for (int i = 0; i < X11->pattern_fill_count; ++i) {
        if (X11->pattern_fills[i].screen == screen
            && X11->pattern_fills[i].opaque == opaque_bg
            && X11->pattern_fills[i].style == b.style()
            && X11->pattern_fills[i].color.alpha == color.alpha
            && X11->pattern_fills[i].color.red == color.red
            && X11->pattern_fills[i].color.green == color.green
            && X11->pattern_fills[i].color.blue == color.blue
            && X11->pattern_fills[i].bg_color.alpha == bg_color.alpha
            && X11->pattern_fills[i].bg_color.red == bg_color.red
            && X11->pattern_fills[i].bg_color.green == bg_color.green
            && X11->pattern_fills[i].bg_color.blue == bg_color.blue)
            return X11->pattern_fills[i].picture;
    }
    // none found, replace one
    int i = rand() % 16;

    if (X11->pattern_fills[i].screen != screen && X11->pattern_fills[i].picture) {
	XRenderFreePicture (X11->display, X11->pattern_fills[i].picture);
	X11->pattern_fills[i].picture = 0;
    }

    if (!X11->pattern_fills[i].picture) {
        Pixmap pixmap = XCreatePixmap (X11->display, RootWindow (X11->display, screen), 8, 8, 32);
        XRenderPictureAttributes attrs;
        attrs.repeat = True;
        X11->pattern_fills[i].picture = XRenderCreatePicture (X11->display, pixmap,
                                                              XRenderFindStandardFormat(X11->display, PictStandardARGB32),
                                                              CPRepeat, &attrs);
        XFreePixmap (X11->display, pixmap);
    }

    X11->pattern_fills[i].screen = screen;
    X11->pattern_fills[i].color = color;
    X11->pattern_fills[i].bg_color = bg_color;
    X11->pattern_fills[i].opaque = opaque_bg;
    X11->pattern_fills[i].style = b.style();

    XRenderFillRectangle(X11->display, PictOpSrc, X11->pattern_fills[i].picture, &bg_color, 0, 0, 8, 8);

    QPixmap pattern(qt_pixmapForBrush(b.style(), true));
    XRenderPictureAttributes attrs;
    attrs.repeat = true;
    XRenderChangePicture(X11->display, pattern.x11PictureHandle(), CPRepeat, &attrs);

    Picture fill_fg = X11->getSolidFill(screen, b.color());
    XRenderComposite(X11->display, PictOpOver, fill_fg, pattern.x11PictureHandle(),
                     X11->pattern_fills[i].picture,
                     0, 0, 0, 0, 0, 0, 8, 8);

    return X11->pattern_fills[i].picture;
}

static void qt_render_bitmap(Display *dpy, int scrn, Picture src, Picture dst,
                      int sx, int sy, int x, int y, int sw, int sh,
                      const QPen &pen, const QBrush &brush, bool opaque_bg)
{
    if (opaque_bg) {
        Picture fill_bg = X11->getSolidFill(scrn, brush.color());
        XRenderComposite(dpy, PictOpOver,
                         fill_bg, 0, dst, sx, sy, sx, sy, x, y, sw, sh);
    }
    Picture fill_fg = X11->getSolidFill(scrn, pen.color());
    XRenderComposite(dpy, PictOpOver,
                     fill_fg, src, dst, sx, sy, sx, sy, x, y, sw, sh);
}
#endif

void QX11PaintEnginePrivate::init()
{
    dpy = 0;
    scrn = 0;
    hd = 0;
    picture = 0;
    xinfo = 0;
#ifndef QT_NO_XRENDER
    current_brush = 0;
    composition_mode = PictOpOver;
#endif
}

void QX11PaintEnginePrivate::setupAdaptedOrigin(const QPoint &p)
{
    if (adapted_pen_origin)
        XSetTSOrigin(dpy, gc, p.x(), p.y());
    if (adapted_brush_origin)
        XSetTSOrigin(dpy, gc_brush, p.x(), p.y());
}

void QX11PaintEnginePrivate::resetAdaptedOrigin()
{
    if (adapted_pen_origin)
        XSetTSOrigin(dpy, gc, 0, 0);
    if (adapted_brush_origin)
        XSetTSOrigin(dpy, gc_brush, 0, 0);
}

void QX11PaintEnginePrivate::clipPolygon_dev(const QPolygonF &poly, QPolygonF *clipped_poly)
{
    int clipped_count = 0;
    qt_float_point *clipped_points = 0;
    polygonClipper.clipPolygon((qt_float_point *) poly.data(), poly.size(),
                               &clipped_points, &clipped_count);
    clipped_poly->resize(clipped_count);
    for (int i=0; i<clipped_count; ++i)
        (*clipped_poly)[i] = *((QPointF *)(&clipped_points[i]));
}

static QPaintEngine::PaintEngineFeatures qt_decide_features()
{
    QPaintEngine::PaintEngineFeatures features =
        QPaintEngine::PrimitiveTransform
        | QPaintEngine::PatternBrush
        | QPaintEngine::AlphaBlend
        | QPaintEngine::PainterPaths;

    if (X11->use_xrender) {
        features |= QPaintEngine::Antialiasing;
        features |= QPaintEngine::PorterDuff;
    }

    return features;
}

/*
 * QX11PaintEngine members
 */

QX11PaintEngine::QX11PaintEngine()
    : QPaintEngine(*(new QX11PaintEnginePrivate), qt_decide_features())
{
    d_func()->init();
}

QX11PaintEngine::QX11PaintEngine(QX11PaintEnginePrivate &dptr)
    : QPaintEngine(dptr, qt_decide_features())
{
    d_func()->init();
}

QX11PaintEngine::~QX11PaintEngine()
{
}

bool QX11PaintEngine::begin(QPaintDevice *pdev)
{
    Q_D(QX11PaintEngine);
    d->xinfo = qt_x11Info(pdev);
#ifndef QT_NO_XRENDER
    if (pdev->devType() == QInternal::Widget) {
        d->picture = (::Picture)static_cast<const QWidget *>(pdev)->x11PictureHandle();
    } else if (pdev->devType() == QInternal::Pixmap) {
        const QPixmap *pm = static_cast<const QPixmap *>(pdev);
        if (X11->use_xrender && pm->data->d != 32 && pm->data->x11_mask)
            pm->data->convertToARGB32();
        d->picture = (::Picture)static_cast<const QPixmap *>(pdev)->x11PictureHandle();
    }
#else
    d->picture = 0;
#endif
    d->hd = qt_x11Handle(pdev);

    Q_ASSERT(d->xinfo != 0);
    d->dpy = d->xinfo->display(); // get display variable
    d->scrn = d->xinfo->screen(); // get screen variable

    d->bg_col = Qt::white;
    d->bg_mode = Qt::TransparentMode;
    d->crgn = QRegion();
    d->gc = XCreateGC(d->dpy, d->hd, 0, 0);
    d->gc_brush = XCreateGC(d->dpy, d->hd, 0, 0);
    d->has_alpha_brush = false;
    d->has_alpha_pen = false;
    d->has_clipping = false;
    d->has_complex_xform = false;
    d->has_custom_pen = false;
    d->matrix = QMatrix();
    d->pdev_depth = d->pdev->depth();
    d->render_hints = 0;
    d->txop = QPainterPrivate::TxNone;
    d->use_path_fallback = false;
#if !defined(QT_NO_XRENDER)
    d->composition_mode = PictOpOver;