render_box.cpp

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    // Paint the color first underneath all images.
    if (!bgLayer->next() && bgColor.isValid() && qAlpha(bgColor.rgb()) > 0) {
        // If we have an alpha and we are painting the root element, go ahead and blend with our default
        // background color (typically white).
        if (qAlpha(bgColor.rgb()) < 0xFF && isRoot() && !canvas()->view()->isTransparent())
            p->fillRect(_tx, clipy, w, cliph, canvas()->view()->palette().active().color(QColorGroup::Base));
        p->fillRect(_tx, clipy, w, cliph, bgColor);
    }

    // no progressive loading of the background image
    if (shouldPaintBackgroundImage) {
        int sx = 0;
        int sy = 0;
        int cw,ch;
        int cx,cy;
        int vpab = bleft + bright;
        int hpab = borderTop() + borderBottom();

        // CSS2 chapter 14.2.1

        if (bgLayer->backgroundAttachment())
        {
            //scroll
            int pw = w - vpab;
            int ph = h - hpab;

            int pixw = bg->pixmap_size().width();
            int pixh = bg->pixmap_size().height();
            EBackgroundRepeat bgr = bgLayer->backgroundRepeat();
            if( (bgr == NO_REPEAT || bgr == REPEAT_Y) && w > pixw ) {
                cw = pixw;
                int xPosition = bgLayer->backgroundXPosition().minWidth(pw-pixw);
                if (xPosition >= 0)
                    cx = _tx + xPosition;
                else {
                    cx = _tx;
                    if (pixw == 0)
                        sx = 0;
                    else {
                        sx = -xPosition;
                        cw += xPosition;
                    }
                }
                cx += bleft;
            } else {
                cw = w;
                cx = _tx;
                if (pixw == 0)
                    sx = 0;
                else {
                    sx =  pixw - ((bgLayer->backgroundXPosition().minWidth(pw-pixw)) % pixw );
                    sx -= bleft % pixw;
                }
            }

            if( (bgr == NO_REPEAT || bgr == REPEAT_X) && h > pixh ) {
                ch = pixh;
                int yPosition = bgLayer->backgroundYPosition().minWidth(ph-pixh);
                if (yPosition >= 0)
                    cy = _ty + yPosition;
                else {
                    cy = _ty;
                    if (pixh == 0)
                        sy = 0;
                    else {
                        sy = -yPosition;
                        ch += yPosition;
                    }
                }

                cy += borderTop();
            } else {
                ch = h;
                cy = _ty;
                if(pixh == 0){
                    sy = 0;
                }else{
                    sy = pixh - ((bgLayer->backgroundYPosition().minWidth(ph-pixh)) % pixh );
                    sy -= borderTop() % pixh;
                }
            }
        }
        else
        {
            //fixed
            QRect vr = viewRect();
            int pw = vr.width();
            int ph = vr.height();

            int pixw = bg->pixmap_size().width();
            int pixh = bg->pixmap_size().height();
            EBackgroundRepeat bgr = bgLayer->backgroundRepeat();
            if( (bgr == NO_REPEAT || bgr == REPEAT_Y) && pw > pixw ) {
                cw = pixw;
                cx = vr.x() + bgLayer->backgroundXPosition().minWidth(pw-pixw);
            } else {
                cw = pw;
                cx = vr.x();
                if(pixw == 0){
                    sx = 0;
                }else{
                    sx =  pixw - ((bgLayer->backgroundXPosition().minWidth(pw-pixw)) % pixw );
                }
            }

            if( (bgr == NO_REPEAT || bgr == REPEAT_X) && ph > pixh ) {
                ch = pixh;
                cy = vr.y() + bgLayer->backgroundYPosition().minWidth(ph-pixh);
            } else {
                ch = ph;
                cy = vr.y();
                if(pixh == 0){
                    sy = 0;
                }else{
                    sy = pixh - ((bgLayer->backgroundYPosition().minWidth(ph-pixh)) % pixh );
                }
            }

            QRect fix(cx,cy,cw,ch);
            QRect ele(_tx,_ty,w,h);
            QRect b = fix.intersect(ele);
            sx+=b.x()-cx;
            sy+=b.y()-cy;
            cx=b.x();cy=b.y();cw=b.width();ch=b.height();
        }


//        kdDebug() << "cx="<<cx << " cy="<<cy<< " cw="<<cw << " ch="<<ch << " sx="<<sx << " sy="<<sy << endl;

        if (cw>0 && ch>0)
            p->drawTiledPixmap(cx, cy, cw, ch, bg->tiled_pixmap(c), sx, sy);
    }
}

void RenderBox::outlineBox(QPainter *p, int _tx, int _ty, const char *color)
{
    p->setPen(QPen(QColor(color), 1, Qt::DotLine));
    p->setBrush( Qt::NoBrush );
    p->drawRect(_tx, _ty, m_width, m_height);
}

QRect RenderBox::getOverflowClipRect(int tx, int ty)
{
    // XXX When overflow-clip (CSS3) is implemented, we'll obtain the property
    // here.
    int bl=borderLeft(),bt=borderTop(),bb=borderBottom(),br=borderRight();
    int clipx = tx+bl;
    int clipy = ty+bt;
    int clipw = m_width-bl-br;
    int cliph = m_height-bt-bb;

    // Subtract out scrollbars if we have them.
    if (m_layer) {
        clipw -= m_layer->verticalScrollbarWidth();
        cliph -= m_layer->horizontalScrollbarHeight();
    }
    return QRect(clipx,clipy,clipw,cliph);
}

QRect RenderBox::getClipRect(int tx, int ty)
{
    int clipx = tx;
    int clipy = ty;
    int clipw = m_width;
    int cliph = m_height;

    if (!style()->clipLeft().isVariable())
    {
        int c=style()->clipLeft().width(m_width);
        clipx+=c;
        clipw-=c;
    }

    if (!style()->clipRight().isVariable())
    {
        int w = style()->clipRight().width(m_width);
        clipw -= m_width - w;
    }

    if (!style()->clipTop().isVariable())
    {
        int c=style()->clipTop().width(m_height);
        clipy+=c;
        cliph-=c;
    }
    if (!style()->clipBottom().isVariable())
    {
        int h = style()->clipBottom().width(m_height);
        cliph -= m_height - h;
    }
    //kdDebug( 6040 ) << "setting clip("<<clipx<<","<<clipy<<","<<clipw<<","<<cliph<<")"<<endl;

    QRect cr(clipx,clipy,clipw,cliph);
    return cr;
}

int RenderBox::containingBlockWidth() const
{
    RenderBlock* cb = containingBlock();
    if (!cb)
        return 0;
    if (usesLineWidth())
        return cb->lineWidth(m_y);
    else
        return cb->contentWidth();
}

bool RenderBox::absolutePosition(int &xPos, int &yPos, bool f)
{
    if (style()->position() == FIXED)
	f = true;
    RenderObject *o = container();
    if (o && o->absolutePosition(xPos, yPos, f)) {
        if (o->hasOverflowClip())
            o->layer()->subtractScrollOffset(xPos, yPos);

        if (!isInline() || isReplaced())
            xPos += m_x, yPos += m_y;

        if (isRelPositioned())
            relativePositionOffset(xPos, yPos);

        return true;
    }
    else {
        xPos = yPos = 0;
        return false;
    }
}

void RenderBox::dirtyLineBoxes(bool fullLayout, bool)
{
    if (m_inlineBoxWrapper) {
        if (fullLayout) {
            m_inlineBoxWrapper->detach(renderArena());
            m_inlineBoxWrapper = 0;
        }
        else
            m_inlineBoxWrapper->dirtyLineBoxes();
    }
}

void RenderBox::position(InlineBox* box, int from, int len, bool reverse)
{
    if (isPositioned()) {
        // Cache the x position only if we were an INLINE type originally.
        bool wasInline = style()->isOriginalDisplayInlineType();
        if (wasInline && hasStaticX()) {
            // The value is cached in the xPos of the box.  We only need this value if
            // our object was inline originally, since otherwise it would have ended up underneath
            // the inlines.
            m_staticX = box->xPos();
        }
        else if (!wasInline && hasStaticY())
            // Our object was a block originally, so we make our normal flow position be
            // just below the line box (as though all the inlines that came before us got
            // wrapped in an anonymous block, which is what would have happened had we been
            // in flow).  This value was cached in the yPos() of the box.
            m_staticY = box->yPos();

        // Nuke the box.
        box->remove();
        box->detach(renderArena());
    }
    else if (isReplaced()) {
        m_x = box->xPos();
        m_y = box->yPos();
        m_inlineBoxWrapper = box;
    }
}

// For inline replaced elements, this function returns the inline box that owns us.  Enables
// the replaced RenderObject to quickly determine what line it is contained on and to easily
// iterate over structures on the line.
InlineBox* RenderBox::inlineBoxWrapper() const
{
    return m_inlineBoxWrapper;
}

void RenderBox::deleteLineBoxWrapper()
{
    if (m_inlineBoxWrapper)
        m_inlineBoxWrapper->detach(renderArena());
    m_inlineBoxWrapper = 0;
}

void RenderBox::setInlineBoxWrapper(InlineBox* b)
{
    m_inlineBoxWrapper = b;
}

QRect RenderBox::getAbsoluteRepaintRect()
{
    int ow = style() ? style()->outlineSize() : 0;
    QRect r(-ow, -ow, overflowWidth(false)+ow*2, overflowHeight(false)+ow*2);
    computeAbsoluteRepaintRect(r);
    return r;
}

void RenderBox::computeAbsoluteRepaintRect(QRect& r, bool f)
{
    int x = r.x() + m_x;
    int y = r.y() + m_y;

    // Apply the relative position offset when invalidating a rectangle.  The layer
    // is translated, but the render box isn't, so we need to do this to get the
    // right dirty rect.  Since this is called from RenderObject::setStyle, the relative position
    // flag on the RenderObject has been cleared, so use the one on the style().
    if (style()->position() == RELATIVE && m_layer)
        m_layer->relativePositionOffset(x,y);

    if (style()->position()==FIXED)
        f = true;

    RenderObject* o = container();
    if (o) {
        // <body> may not have overflow, since it might be applying its overflow value to the
        // scrollbars.
        if (o->hasOverflowClip()) {
            // o->height() is inaccurate if we're in the middle of a layout of |o|, so use the
            // layer's size instead.  Even if the layer's size is wrong, the layer itself will repaint
            // anyway if its size does change.
            QRect boxRect(0, 0, o->layer()->width(), o->layer()->height());
            o->layer()->subtractScrollOffset(x,y); // For overflow:auto/scroll/hidden.
            QRect repaintRect(x, y, r.width(), r.height());
            r = repaintRect.intersect(boxRect);
            if (r.isEmpty())
                return;
        }
        else {
            r.setX(x);
            r.setY(y);
        }
        o->computeAbsoluteRepaintRect(r, f);
    }
}

void RenderBox::repaintDuringLayoutIfMoved(int oldX, int oldY)
{
    int newX = m_x;
    int newY = m_y;
    if (oldX != newX || oldY != newY) {
        // The child moved.  Invalidate the object's old and new positions.  We have to do this
        // since the object may not have gotten a layout.
        m_x = oldX; m_y = oldY;
        repaint();
        repaintFloatingDescendants();
        m_x = newX; m_y = newY;
        repaint();
        repaintFloatingDescendants();
    }
}

void RenderBox::relativePositionOffset(int &tx, int &ty)
{
    if(!style()->left().isVariable())
        tx += style()->left().width(containingBlockWidth());
    else if(!style()->right().isVariable())
        tx -= style()->right().width(containingBlockWidth());
    if(!style()->top().isVariable())
    {
        if (!style()->top().isPercent()
                || containingBlock()->style()->height().isFixed())
            ty += style()->top().width(containingBlockHeight());
    }
    else if(!style()->bottom().isVariable())
    {
        if (!style()->bottom().isPercent()
                || containingBlock()->style()->height().isFixed())
            ty -= style()->bottom().width(containingBlockHeight());
    }
}

void RenderBox::calcWidth()
{
#ifdef DEBUG_LAYOUT
    kdDebug( 6040 ) << "RenderBox("<<renderName()<<")::calcWidth()" << endl;
#endif
    if (isPositioned())
    {
        calcAbsoluteHorizontal();
    }
    else
    {
        // The parent box is flexing us, so it has increased or decreased our width.  Use the width
        // from the style context.
        if (m_overrideSize != -1 && parent()->isFlexibleBox() && parent()->style()->boxOrient() == HORIZONTAL
            && parent()->isFlexingChildren()) {
            m_width = m_overrideSize;
            return;
        }

        bool inVerticalBox = parent()->isFlexibleBox() && parent()->style()->boxOrient() == VERTICAL;
        bool stretching = parent()->style()->boxAlign() == BSTRETCH;
        bool treatAsReplaced = isReplaced() && !isInlineBlockOrInlineTable() &&
            (!inVerticalBox || !stretching);
        Length w;
        if (treatAsReplaced)
            w = Length( calcReplacedWidth(), Fixed );
        else
            w = style()->width();

        Length ml = style()->marginLeft();
        Length mr = style()->marginRight();

        RenderBlock *cb = containingBlock();
        int cw = containingBlockWidth();