render_image.cpp

khtml在gtk上的移植版本

            }
#else /* not APPLE_CHANGES */
            if ( !berrorPic ) {
                //qDebug("qDrawShadePanel %d/%d/%d/%d", _tx + leftBorder, _ty + topBorder, cWidth, cHeight);
                qDrawShadePanel( p, _tx + leftBorder + leftPad, _ty + topBorder + topPad, cWidth, cHeight,
                                 KApplication::palette().inactive(), true, 1 );
            }
            if(berrorPic && !pix.isNull() && (cWidth >= pix.width()+4) && (cHeight >= pix.height()+4) )
            {
                QRect r(pix.rect());
                r = r.intersect(QRect(0, 0, cWidth-4, cHeight-4));
                p->drawPixmap( QPoint( _tx + leftBorder + leftPad+2, _ty + topBorder + topPad+2), pix, r );
            }
            if(!alt.isEmpty()) {
                QString text = alt.string();
                text.replace('\\', backslashAsCurrencySymbol());
                p->setFont(style()->font());
                p->setPen( style()->color() );
                int ax = _tx + leftBorder + leftPad + 2;
                int ay = _ty + topBorder + topPad + 2;
                const QFontMetrics &fm = style()->fontMetrics();
                if (cWidth>5 && cHeight>=fm.height())
                    p->drawText(ax, ay+1, cWidth - 4, cHeight - 4, Qt::WordBreak, text );
            }
#endif /* APPLE_CHANGES not defined */
        }
    }
    else if (image && !image->isTransparent())
    {
#if APPLE_CHANGES
        // Do the calculations to draw selections as tall as the line.
        // Ignore the passed-in value for _ty.
        // Use the bottom of the line above as the y position (if there is one, 
        // otherwise use the top of this renderer's line) and the height of the line as the height. 
        // This mimics Cocoa.
        int selectionTop = -1;
        int selectionHeight = -1;
        int selectionLeft = -1;
        int selectionRight = -1;
        bool extendSelectionToLeft = false;
        bool extendSelectionToRight = false;
        if (drawSelectionTint) {
            InlineBox *box = inlineBox();
            if (box) {
                // Get a value for selectionTop that is relative to the containing block.
                // This value is used for determining left and right offset for the selection, if necessary,
                // and for calculating the selection height.
                if (box->root()->prevRootBox())
                    selectionTop = box->root()->prevRootBox()->bottomOverflow();
                else
                    selectionTop = box->root()->topOverflow();

                selectionHeight = box->root()->bottomOverflow() - selectionTop;

                int absx, absy;
                containingBlock()->absolutePosition(absx, absy);

                if (selectionState() == SelectionInside && box->root()->firstLeafChild() == box) {
                    extendSelectionToLeft = true;
                    selectionLeft = absx + containingBlock()->leftOffset(selectionTop);
                }
                if (selectionState() == SelectionInside && box->root()->lastLeafChild() == box) {
                    extendSelectionToRight = true;
                    selectionRight = absx + containingBlock()->rightOffset(selectionTop);
                }
        
                // Now make the selectionTop an absolute coordinate.
                selectionTop += absy;
            }
        }
#endif

        if ( (cWidth != intrinsicWidth() ||  cHeight != intrinsicHeight()) &&
             pix.width() > 0 && pix.height() > 0 && image->valid_rect().isValid())
        {
#if APPLE_CHANGES
            QSize tintSize;
#endif
            if (resizeCache.isNull() && cWidth && cHeight)
            {
                QRect scaledrect(image->valid_rect());
//                 kdDebug(6040) << "time elapsed: " << dt->elapsed() << endl;
//                  kdDebug( 6040 ) << "have to scale: " << endl;
//                  qDebug("cw=%d ch=%d  pw=%d ph=%d  rcw=%d, rch=%d",
//                          cWidth, cHeight, intrinsicWidth(), intrinsicHeight(), resizeCache.width(), resizeCache.height());
                QWMatrix matrix;
                matrix.scale( (float)(cWidth)/intrinsicWidth(),
                              (float)(cHeight)/intrinsicHeight() );
                resizeCache = pix.xForm( matrix );
                scaledrect.setWidth( ( cWidth*scaledrect.width() ) / intrinsicWidth() );
                scaledrect.setHeight( ( cHeight*scaledrect.height() ) / intrinsicHeight() );
//                   qDebug("resizeCache size: %d/%d", resizeCache.width(), resizeCache.height());
//                   qDebug("valid: %d/%d, scaled: %d/%d",
//                          image->valid_rect().width(), image->valid_rect().height(),
//                          scaledrect.width(), scaledrect.height());

                // sometimes scaledrect.width/height are off by one because
                // of rounding errors. if the image is fully loaded, we
                // make sure that we don't do unnecessary resizes during painting
                QSize s(scaledrect.size());
                if(image->valid_rect().size() == QSize( intrinsicWidth(), intrinsicHeight() )) // fully loaded
                    s = QSize(cWidth, cHeight);
                if(QABS(s.width() - cWidth) < 2) // rounding errors
                    s.setWidth(cWidth);
                if(resizeCache.size() != s)
                    resizeCache.resize(s);

                p->drawPixmap( QPoint( _tx + leftBorder + leftPad, _ty + topBorder + topPad),
                               resizeCache, scaledrect );
#if APPLE_CHANGES
                tintSize = s;
#endif
            } else {
                p->drawPixmap( QPoint( _tx + leftBorder + leftPad, _ty + topBorder + topPad), resizeCache );
#if APPLE_CHANGES
                tintSize = resizeCache.rect().size();
#endif
            }
#if APPLE_CHANGES
            if (drawSelectionTint) {
                int left = _tx + leftBorder + leftPad;
                int width = tintSize.width();
                int top = selectionTop >= 0 ? selectionTop : _ty + topBorder + topPad;
                int height = selectionHeight >= 0 ? selectionHeight : tintSize.height();
                QBrush brush(selectionTintColor(p));
                p->fillRect(left, top, width, height, brush);
                if (extendSelectionToLeft)
                    p->fillRect(selectionLeft, selectionTop, left - selectionLeft, selectionHeight, brush);
                if (extendSelectionToRight)
                    p->fillRect(left + width, selectionTop, selectionRight - (left + width), selectionHeight, brush);
            }
#endif
        }
        else
        {
            // we might be just about switching images
            // so pix contains the old one (we want to paint), but image->valid_rect is still invalid
            // so use intrinsic Size instead.
            // ### maybe no progressive loading for the second image ?
            QRect rect(image->valid_rect().isValid() ? image->valid_rect()
                       : QRect(0, 0, intrinsicWidth(), intrinsicHeight()));
            
            QPoint offs( _tx + leftBorder + leftPad, _ty + topBorder + topPad);
//             qDebug("normal paint rect %d/%d/%d/%d", rect.x(), rect.y(), rect.width(), rect.height());
//             rect = rect & QRect( 0 , y - offs.y() - 10, w, 10 + y + h  - offs.y());

//             qDebug("normal paint rect after %d/%d/%d/%d", rect.x(), rect.y(), rect.width(), rect.height());
//             qDebug("normal paint: offs.y(): %d, y: %d, diff: %d", offs.y(), y, y - offs.y());
//             qDebug("");

//           p->setClipRect(QRect(x,y,w,h));


//             p->drawPixmap( offs.x(), y, pix, rect.x(), rect.y(), rect.width(), rect.height() );
#if APPLE_CHANGES && !KWIQ
             HTMLImageElementImpl* i = (element() && element()->id() == ID_IMG) ? static_cast<HTMLImageElementImpl*>(element()) : 0;
             if (i && !i->compositeOperator().isNull()){
               p->drawPixmap (offs, pix, rect, i->compositeOperator());
               
             }
             else {
#endif               
                 p->drawPixmap(offs, pix, rect);

#if APPLE_CHANGES && !KWIQ
             }
#endif
#if APPLE_CHANGES 
             if (drawSelectionTint) {
                p->fillRect(offs.x() + rect.x(), offs.y() + rect.y(), rect.width(), rect.height(), QBrush(selectionTintColor(p)));
                int left = offs.x() + rect.x();
                int width = rect.width();
                int top = selectionTop >= 0 ? selectionTop : offs.y() + rect.y();
                int height = selectionHeight >= 0 ? selectionHeight : rect.height();
                QBrush brush(selectionTintColor(p));
                p->fillRect(left, top, width, height, brush);
                if (extendSelectionToLeft)
                    p->fillRect(selectionLeft, selectionTop, left - selectionLeft, selectionHeight, brush);
                if (extendSelectionToRight)
                    p->fillRect(left + width, selectionTop, selectionRight - (left + width), selectionHeight, brush);
             }
#endif
        }
    }
}

void RenderImage::layout()
{
    KHTMLAssert(needsLayout());
    KHTMLAssert( minMaxKnown() );

    QRect oldBounds;
    bool checkForRepaint = checkForRepaintDuringLayout();
    if (checkForRepaint)
        oldBounds = getAbsoluteRepaintRect();
    
    int oldwidth = m_width;
    int oldheight = m_height;

    // minimum height
    m_height = image && image->isErrorImage() ? intrinsicHeight() : 0;

    calcWidth();
    calcHeight();

    // if they are variable width and we calculate a huge height or width, we assume they
    // actually wanted the intrinsic width.
    if ( m_width > 2048 && !style()->width().isFixed() )
	m_width = intrinsicWidth();
    if ( m_height > 2048 && !style()->height().isFixed() )
	m_height = intrinsicHeight();

// We don't want to impose a constraint on image size here. But there also
// is a bug somewhere that causes the scaled height to be used with the
// original width, causing the image to be compressed vertically.
#if !APPLE_CHANGES
    // limit total size to not run out of memory when doing the xform call.
    if ( m_width * m_height > 2048*2048 ) {
	float scale = sqrt( m_width*m_height / ( 2048.*2048. ) );
	m_width = (int) (m_width/scale);
	m_height = (int) (m_height/scale);
    }
#endif

    if ( m_width != oldwidth || m_height != oldheight )
        resizeCache = QPixmap();

    if (checkForRepaint)
        repaintAfterLayoutIfNeeded(oldBounds, oldBounds);
    
    setNeedsLayout(false);
}

HTMLMapElementImpl* RenderImage::imageMap()
{
    HTMLImageElementImpl* i = element()->id() == ID_IMG ? static_cast<HTMLImageElementImpl*>(element()) : 0;
    return i ? i->getDocument()->getImageMap(i->imageMap()) : 0;
}

bool RenderImage::nodeAtPoint(NodeInfo& info, int _x, int _y, int _tx, int _ty,
                              HitTestAction hitTestAction, bool inside)
{
    inside |= RenderReplaced::nodeAtPoint(info, _x, _y, _tx, _ty, hitTestAction, inside);

    if (inside && element()) {
        int tx = _tx + m_x;
        int ty = _ty + m_y;
        
        HTMLMapElementImpl* map = imageMap();
        if (map) {
            // we're a client side image map
            inside = map->mapMouseEvent(_x - tx, _y - ty, contentWidth(), contentHeight(), info);
            info.setInnerNonSharedNode(element());
        }
    }

    return inside;
}

void RenderImage::updateAltText()
{
    if (element()->id() == ID_INPUT)
        alt = static_cast<HTMLInputElementImpl*>(element())->altText();
    else if (element()->id() == ID_IMG)
        alt = static_cast<HTMLImageElementImpl*>(element())->altText();
}

bool RenderImage::isWidthSpecified() const
{
    switch (style()->width().type) {
        case Fixed:
        case Percent:
            return true;
        default:
            return false;
    }
    assert(false);
    return false;
}

bool RenderImage::isHeightSpecified() const
{
    switch (style()->height().type) {
        case Fixed:
        case Percent:
            return true;
        default:
            return false;
    }
    assert(false);
    return false;
}

int RenderImage::calcReplacedWidth() const
{
    // If height is specified and not width, preserve aspect ratio.
    if (isHeightSpecified() && !isWidthSpecified()) {
        if (intrinsicHeight() == 0){
            return 0;
        }
        return calcReplacedHeight() * intrinsicWidth() / intrinsicHeight();
    }
    return RenderReplaced::calcReplacedWidth();
}

int RenderImage::calcReplacedHeight() const
{
    // If width is specified and not height, preserve aspect ratio.
    if (isWidthSpecified() && !isHeightSpecified()) {
        if (intrinsicWidth() == 0){
            return 0;
        }
        return calcReplacedWidth() * intrinsicHeight() / intrinsicWidth();
    }
    return RenderReplaced::calcReplacedHeight();
}