render_image.cpp

konqueror3 embedded版本, KDE环境下的当家浏览器的嵌入式版本源码包.

/**
 * This file is part of the DOM implementation for KDE.
 *
 * Copyright (C) 1999-2003 Lars Knoll ([e-mail])
 *           (C) 1999 Antti Koivisto ([e-mail])
 *           (C) 2000-2003 Dirk Mueller ([e-mail])
 *           (C) 2003 Apple Computer, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */
//#define DEBUG_LAYOUT

#include "render_image.h"
#include "render_canvas.h"

#include <qdrawutil.h>
#include <qpainter.h>

#include <kapplication.h>
#include <kdebug.h>
#include <kglobalsettings.h>

#include "css/csshelper.h"
#include "misc/helper.h"
#include "misc/htmlattrs.h"
#include "misc/loader.h"
#include "misc/htmltags.h"
#include "html/html_formimpl.h"
#include "html/html_imageimpl.h"
#include "html/dtd.h"
#include "xml/dom2_eventsimpl.h"
#include "html/html_documentimpl.h"
#include "html/html_objectimpl.h"
#include "khtmlview.h"
#include "khtml_part.h"
#include <math.h>

#include "loading_icon.cpp"

using namespace DOM;
using namespace khtml;

// -------------------------------------------------------------------------

RenderImage::RenderImage(NodeImpl *_element)
    : RenderReplaced(_element)
{
    oimage = image = 0;

    m_selectionState = SelectionNone;
    berrorPic = false;

    const KHTMLSettings *settings = _element->getDocument()->view()->part()->settings();
    bUnfinishedImageFrame = settings->unfinishedImageFrame();

    setIntrinsicWidth( 0 );
    setIntrinsicHeight( 0 );
}

RenderImage::~RenderImage()
{
    if(image) image->deref(this);
    if (oimage) oimage->deref( this );
}

QPixmap RenderImage::pixmap() const
{
    return image ? image->pixmap() : QPixmap();
}

void RenderImage::setStyle(RenderStyle* _style)
{
    RenderReplaced::setStyle(_style);
    // init RenderObject attributes
    //setOverhangingContents(style()->height().isPercent());
    setShouldPaintBackgroundOrBorder(true);
}

void RenderImage::setContentObject(CachedObject* co )
{
    if (co && image != co)
        updateImage( static_cast<CachedImage*>( co ) );
}

void RenderImage::setPixmap( const QPixmap &p, const QRect& r, CachedImage *o)
{
    if ( o == oimage )
        return;

    if(o != image) {
        RenderReplaced::setPixmap(p, r, o);
        return;
    }

    bool iwchanged = false;

    if(o->isErrorImage()) {
        int iw = p.width() + 8;
        int ih = p.height() + 8;

        // we have an alt and the user meant it (its not a text we invented)
        if ( element() && !alt.isEmpty() && !element()->getAttribute( ATTR_ALT ).isNull()) {
            const QFontMetrics &fm = style()->fontMetrics();
            QRect br = fm.boundingRect (  0, 0, 1024, 256, Qt::AlignAuto|Qt::WordBreak, alt.string() );
            if ( br.width() > iw )
                iw = br.width();
            if ( br.height() > ih )
                ih = br.height();
        }

        if ( iw != intrinsicWidth() ) {
            setIntrinsicWidth( iw );
            iwchanged = true;
        }
        if ( ih != intrinsicHeight() ) {
            setIntrinsicHeight( ih );
            iwchanged = true;
        }
        if ( element() && element()->id() == ID_OBJECT ) {
            static_cast<HTMLObjectElementImpl*>(  element() )->renderAlternative();
            return;
        }
    }
    berrorPic = o->isErrorImage();

    bool needlayout = false;

    // Image dimensions have been changed, see what needs to be done
    if( o->pixmap_size().width() != intrinsicWidth() ||
       o->pixmap_size().height() != intrinsicHeight() || iwchanged )
    {
//           qDebug("image dimensions have been changed, old: %d/%d  new: %d/%d",
//                  intrinsicWidth(), intrinsicHeight(),
//               o->pixmap_size().width(), o->pixmap_size().height());

        if(!o->isErrorImage()) {
            setIntrinsicWidth( o->pixmap_size().width() );
            setIntrinsicHeight( o->pixmap_size().height() );
        }

         // lets see if we need to relayout at all..
         int oldwidth = m_width;
         int oldheight = m_height;
         int oldminwidth = m_minWidth;
         m_minWidth = 0;

         if ( parent() ) {
             calcWidth();
             calcHeight();
         }

         if(iwchanged || m_width != oldwidth || m_height != oldheight)
             needlayout = true;

         m_minWidth = oldminwidth;
         m_width = oldwidth;
         m_height = oldheight;
    }

    // we're not fully integrated in the tree yet.. we'll come back.
    if ( !parent() )
        return;

    if(needlayout)
    {
        if (!selfNeedsLayout())
            setNeedsLayout(true);
        if (minMaxKnown())
            setMinMaxKnown(false);
    }
    else
    {
        bool completeRepaint = !resizeCache.isNull();
        int cHeight = contentHeight();
        int scaledHeight = intrinsicHeight() ? ((o->valid_rect().height()*cHeight)/intrinsicHeight()) : 0;

        // don't bog down X server doing xforms
        if(completeRepaint && cHeight >= 5 &&  o->valid_rect().height() < intrinsicHeight() &&
           (scaledHeight / (cHeight/5) == resizeCache.height() / (cHeight/5)))
            return;

        resizeCache = QPixmap(); // for resized animations

        if(completeRepaint)
            repaintRectangle(borderLeft()+paddingLeft(), borderTop()+paddingTop(), contentWidth(), contentHeight());
        else
        {
            repaintRectangle(r.x() + borderLeft() + paddingLeft(), r.y() + borderTop() + paddingTop(),
                             r.width(), r.height());
        }
    }
}

void RenderImage::paint(PaintInfo& paintInfo, int _tx, int _ty)
{
    if (paintInfo.phase == PaintActionOutline && style()->outlineWidth() && style()->visibility() == VISIBLE)
        paintOutline(paintInfo.p, _tx + m_x, _ty + m_y, width(), height(), style());

    if (paintInfo.phase != PaintActionForeground && paintInfo.phase != PaintActionSelection)
        return;

    // not visible or not even once layouted?
    if (style()->visibility() != VISIBLE || m_y <=  -500000)  return;

    _tx += m_x;
    _ty += m_y;

    if((_ty > paintInfo.r.bottom()) || (_ty + m_height <= paintInfo.r.top())) return;

    if(shouldPaintBackgroundOrBorder())
        paintBoxDecorations(paintInfo, _tx, _ty);

    int cWidth = contentWidth();
    int cHeight = contentHeight();
    int leftBorder = borderLeft();
    int topBorder = borderTop();
    int leftPad = paddingLeft();
    int topPad = paddingTop();

    if (!canvas()->printImages())
        return;

    CachedImage* i = oimage && oimage->valid_rect().size() == oimage->pixmap_size() &&
                     oimage->pixmap_size().width()  == intrinsicWidth() &&
                     oimage->pixmap_size().height() == intrinsicHeight()
                     ? oimage : image;

    // paint frame around image as long as it is not completely loaded from web.
    if (bUnfinishedImageFrame && paintInfo.phase == PaintActionForeground && cWidth > 2 && cHeight > 2 && !complete()) {
        static QPixmap *loadingIcon;
        QColor bg = khtml::retrieveBackgroundColor(this);
        QColor fg = khtml::hasSufficientContrast(Qt::gray, bg) ? Qt::gray :
                    (hasSufficientContrast(Qt::white, bg) ? Qt::white : Qt::black);
	paintInfo.p->setPen(QPen(fg, 1));
	paintInfo.p->setBrush( Qt::NoBrush );
	paintInfo.p->drawRect(_tx, _ty, m_width, m_height);
        if (!(m_width <= 5 || m_height <= 5)) {
            if (!loadingIcon) {
                loadingIcon = new QPixmap();
                loadingIcon->loadFromData(loading_icon_data, loading_icon_len);
            }
            paintInfo.p->drawPixmap(_tx + 4, _ty + 4, *loadingIcon, 0, 0, m_width - 5, m_height - 5);
        }

    }

    //kdDebug( 6040 ) << "    contents (" << contentWidth << "/" << contentHeight << ") border=" << borderLeft() << " padding=" << paddingLeft() << endl;
    if ( !i || berrorPic)
    {
        if(cWidth > 2 && cHeight > 2)
        {
            if ( !berrorPic ) {
                //qDebug("qDrawShadePanel %d/%d/%d/%d", _tx + leftBorder, _ty + topBorder, cWidth, cHeight);
                qDrawShadePanel( paintInfo.p, _tx + leftBorder + leftPad, _ty + topBorder + topPad, cWidth, cHeight,
                                 KApplication::palette().inactive(), true, 1 );
            }
            QPixmap const* pix = i ? &i->pixmap() : 0;
            if(berrorPic && pix && (cWidth >= pix->width()+4) && (cHeight >= pix->height()+4) )
            {
                QRect r(pix->rect());
                r = r.intersect(QRect(0, 0, cWidth-4, cHeight-4));
                paintInfo.p->drawPixmap( QPoint( _tx + leftBorder + leftPad+2, _ty + topBorder + topPad+2), *pix, r );
            }
            if(!alt.isEmpty()) {
                QString text = alt.string();
                paintInfo.p->setFont(style()->font());
                paintInfo.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())
                    paintInfo.p->drawText(ax, ay+1, cWidth - 4, cHeight - 4, Qt::WordBreak, text );
            }
        }
    }
    else if (i && !i->isTransparent())
    {
        paintInfo.p->setPen( Qt::black ); // used for bitmaps
        const QPixmap& pix = i->pixmap();
        if ( (cWidth != intrinsicWidth() ||  cHeight != intrinsicHeight()) &&
             pix.width() > 0 && pix.height() > 0 && i->valid_rect().isValid())
        {
            if (resizeCache.isNull() && cWidth && cHeight && intrinsicWidth() && intrinsicHeight())
            {
                QRect scaledrect(i->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(),