render_image.cpp

khtml在gtk上的移植版本

/**
 * This file is part of the DOM implementation for KDE.
 *
 * Copyright (C) 1999 Lars Knoll ([e-mail])
 *           (C) 1999 Antti Koivisto ([e-mail])
 *           (C) 2000 Dirk Mueller ([e-mail])
 * Copyright (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., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, 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 "css/csshelper.h"
#include "misc/helper.h"
#include "misc/htmlattrs.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 <math.h>

using namespace DOM;
using namespace khtml;

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

RenderImage::RenderImage(NodeImpl *_node)
    : RenderReplaced(_node)
{
    image = 0;
    berrorPic = false;
    m_selectionState = SelectionNone;

    setIntrinsicWidth( 0 );
    setIntrinsicHeight( 0 );
}

RenderImage::~RenderImage()
{
    if(image) image->deref(this);
    pix.decreaseUseCount();
}

void RenderImage::setStyle(RenderStyle* _style)
{
    RenderReplaced::setStyle(_style);
    
    setShouldPaintBackgroundOrBorder(true);
}

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

void RenderImage::setImage(CachedImage* newImage)
{
    if (image)
        image->deref(this);
    image = newImage;
    if (image)
        image->ref(this);
}

void RenderImage::setPixmap( const QPixmap &p, const QRect& r, CachedImage *o)
{
    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;
        }
    }
    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() );
        }

        // In the case of generated image content using :before/:after, we might not be in the
        // render tree yet.  In that case, we don't need to worry about check for layout, since we'll get a
        // layout when we get added in to the render tree hierarchy later.
        if (containingBlock()) {
            // lets see if we need to relayout at all..
            int oldwidth = m_width;
            int oldheight = m_height;
            calcWidth();
            calcHeight();
    
            if(iwchanged || m_width != oldwidth || m_height != oldheight)
                needlayout = true;
    
            m_width = oldwidth;
            m_height = oldheight;
        }
    }

#if APPLE_CHANGES && !KWIQ //FIXME: testing for animations
    // Stop the previous image, if it may be animating.
    pix.stopAnimations();
#endif
    
#if APPLE_CHANGES
    pix.decreaseUseCount();
#endif
    pix = p;
#if APPLE_CHANGES
    p.increaseUseCount();
#endif

    if (needlayout) {
        if (!selfNeedsLayout())
            setNeedsLayout(true);
        if (minMaxKnown())
            setMinMaxKnown(false);
    }
    else {
#if APPLE_CHANGES
        // FIXME: We always just do a complete repaint, since we always pass in the full pixmap
        // rect at the moment anyway.
        resizeCache = QPixmap();
        repaintRectangle(QRect(borderLeft()+paddingLeft(), borderTop()+paddingTop(), contentWidth(), contentHeight()));
#else
        // FIXME: This code doesn't handle scaling properly, since it doesn't scale |r|.
        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(QRect(borderLeft()+paddingLeft(), borderTop()+paddingTop(), contentWidth(), contentHeight()));
        else
        {
            repaintRectangle(QRect(r.x() + borderLeft() + paddingLeft(), r.y() + borderTop() + paddingTop(),
                             r.width(), r.height()));
        }
#endif
    }
}

#if APPLE_CHANGES
QColor RenderImage::selectionTintColor(QPainter *p) const
{
    QColor color;
    RenderStyle* pseudoStyle = getPseudoStyle(RenderStyle::SELECTION);
    if (pseudoStyle && pseudoStyle->backgroundColor().isValid()) {
        color = pseudoStyle->backgroundColor();
    } else {
        color = p->selectedTextBackgroundColor();
    }
    return QColor(qRgba(color.red(), color.green(), color.blue(), 160));
}
#endif

void RenderImage::paint(PaintInfo& i, int _tx, int _ty)
{
    if (!shouldPaint(i, _tx, _ty)) return;

    _tx += m_x;
    _ty += m_y;
        
    if (shouldPaintBackgroundOrBorder() && i.phase != PaintActionOutline) 
        paintBoxDecorations(i, _tx, _ty);

    QPainter* p = i.p;
    
    if (i.phase == PaintActionOutline && style()->outlineWidth() && style()->visibility() == VISIBLE)
        paintOutline(p, _tx, _ty, width(), height(), style());
    
    if (i.phase != PaintActionForeground && i.phase != PaintActionSelection)
        return;

    if (!shouldPaintWithinRoot(i))
        return;
        
#if APPLE_CHANGES
    bool drawSelectionTint = selectionState() != SelectionNone;
    if (i.phase == PaintActionSelection) {
        if (selectionState() == SelectionNone) {
            return;
        }
        drawSelectionTint = false;
    }
#endif
        
    int cWidth = contentWidth();
    int cHeight = contentHeight();
    int leftBorder = borderLeft();
    int topBorder = borderTop();
    int leftPad = paddingLeft();
    int topPad = paddingTop();

    if (khtml::printpainter && !canvas()->printImages())
        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 - leftBorder - borderRight() - leftPad - paddingRight();
            int usableHeight = cHeight - topBorder - borderBottom() - topPad - paddingBottom();
            
            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('\\', 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 );