render_image.cpp

手机浏览器源码程序,功能强大

        return;

    //kdDebug( 6040 ) << "    contents (" << contentWidth << "/" << contentHeight << ") border=" << borderLeft() << " padding=" << paddingLeft() << endl;
    if ( pix.isNull() || berrorPic)
    {
        if (i.phase == PaintActionSelection)
            return;

        if(cWidth > 2 && cHeight > 2)
        {
#if APPLE_CHANGES
            if ( !berrorPic ) {
                p->setPen (Qt::lightGray);
                p->setBrush (Qt::NoBrush);
                p->drawRect (_tx + leftBorder + leftPad, _ty + topBorder + topPad, cWidth, cHeight);
        }

            bool errorPictureDrawn = false;
            int imageX = 0, imageY = 0;
            int usableWidth = cWidth;
            int usableHeight = cHeight;

            if (berrorPic && !pix.isNull() && (usableWidth >= pix.width()) && (usableHeight >= pix.height())) {
                // Center the error image, accounting for border and padding.
                int centerX = (usableWidth - pix.width())/2;
                if (centerX < 0)
                    centerX = 0;
                int centerY = (usableHeight - pix.height())/2;
                if (centerY < 0)
                    centerY = 0;
                imageX = leftBorder + leftPad + centerX;
                imageY = topBorder + topPad + centerY;
                p->drawPixmap(QPoint(_tx + imageX, _ty + imageY), pix, pix.rect());
                errorPictureDrawn = true;
            }

            if (!alt.isEmpty()) {
                QString text = alt.string();
                text.replace(QChar('\\'), backslashAsCurrencySymbol());
                p->setFont (style()->font());
                p->setPen (style()->color());
                int ax = _tx + leftBorder + leftPad;
                int ay = _ty + topBorder + topPad;
                const QFontMetrics &fm = style()->fontMetrics();
                int ascent = fm.ascent();

                // Only draw the alt text if it'll fit within the content box,
                // and only if it fits above the error image.
                int textWidth = fm.width (text, text.length());
                if (errorPictureDrawn) {
                    if (usableWidth >= textWidth && fm.height() <= imageY)
                        p->drawText(ax, ay+ascent, 0 /* ignored */, 0 /* ignored */, Qt::WordBreak  /* not supported */, text );
                }
                else if (usableWidth >= textWidth && cHeight >= fm.height())
                    p->drawText(ax, ay+ascent, 0 /* ignored */, 0 /* ignored */, Qt::WordBreak  /* not supported */, text );
            }
#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 ( (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) {
                QBrush brush(selectionColor(p));
                QRect selRect(selectionRect());
                p->fillRect(selRect.x(), selRect.y(), selRect.width(), selRect.height(), 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() );
             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 {
                 p->drawPixmap(offs, pix, rect);
             }
#if APPLE_CHANGES
             if (drawSelectionTint) {
                 QBrush brush(selectionColor(p));
                 QRect selRect(selectionRect());
                 p->fillRect(selRect.x(), selRect.y(), selRect.width(), selRect.height(), 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 = RenderReplaced::nodeAtPoint(info, _x, _y, _tx, _ty, hitTestAction);

    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;
        if (!image || image->isErrorImage())
            return intrinsicWidth(); // Don't bother scaling.
        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;
        if (!image || image->isErrorImage())
            return intrinsicHeight(); // Don't bother scaling.
        return calcReplacedWidth() * intrinsicHeight() / intrinsicWidth();
    }
    return RenderReplaced::calcReplacedHeight();
}