render_canvas.cpp

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/**
 * This file is part of the HTML widget for KDE.
 *
 * Copyright (C) 1999 Lars Knoll ([e-mail])
 * Copyright (C) 2004 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.
 */
#include "rendering/render_canvas.h"
#include "render_layer.h"
#include "xml/dom_docimpl.h"

#include "khtmlview.h"
#include <kdebug.h>

#if APPLE_CHANGES
#include "khtml_part.h"
#endif

using namespace khtml;

//#define BOX_DEBUG
//#define SPEED_DEBUG

#if NOKIA_CHANGES
#define NOKIA_MIN_WIDTH_LIMIT 850
#endif

RenderCanvas::RenderCanvas(DOM::NodeImpl* node, KHTMLView *view)
    : RenderBlock(node)
{
    // Clear our anonymous bit.
    setIsAnonymous(false);

    // init RenderObject attributes
    setInline(false);

    m_view = view;
    // try to contrain the width to the views width

    m_minWidth = 0;
    m_height = 0;

    m_width = m_minWidth;
    m_maxWidth = m_minWidth;

    m_rootWidth = m_rootHeight = 0;
    m_viewportWidth = m_viewportHeight = 0;

    setPositioned(true); // to 0,0 :)

    m_printingMode = false;
    m_printImages = true;

    m_maximalOutlineSize = 0;

    m_selectionStart = 0;
    m_selectionEnd = 0;
    m_selectionStartPos = -1;
    m_selectionEndPos = -1;

    // Create a new root layer for our layer hierarchy.
    m_layer = new (node->getDocument()->renderArena()) RenderLayer(this);
}

RenderCanvas::~RenderCanvas()
{
}

void RenderCanvas::calcHeight()
{
    if (!m_printingMode && m_view)
    {
        m_height = m_view->visibleHeight();
    }
    else if (!m_view)
    {
        m_height = m_rootHeight;
    }
}

void RenderCanvas::calcWidth()
{
    // the width gets set by KHTMLView::print when printing to a printer.
    if(m_printingMode || !m_view)
    {
        m_width = m_rootWidth;
        return;
    }

#if NOKIA_CHANGES
    int constraintWidth = m_view->frameWidth();
    int limitWidth = QMIN(NOKIA_MIN_WIDTH_LIMIT,m_minWidth);
    if (!document()->isXHtmlMobile() && constraintWidth<limitWidth)
        constraintWidth = limitWidth;
    m_width = m_view ?
                constraintWidth + paddingLeft() + paddingRight() + borderLeft() + borderRight()
                : m_minWidth;
#else
    m_width = m_view ?
                m_view->frameWidth() + paddingLeft() + paddingRight() + borderLeft() + borderRight()
                : m_minWidth;
#endif

    if (style()->marginLeft().type==Fixed)
        m_marginLeft = style()->marginLeft().value;
    else
        m_marginLeft = 0;

    if (style()->marginRight().type==Fixed)
        m_marginRight = style()->marginRight().value;
    else
        m_marginRight = 0;
}

void RenderCanvas::calcMinMaxWidth()
{
    KHTMLAssert( !minMaxKnown() );

    RenderBlock::calcMinMaxWidth();

    m_maxWidth = m_minWidth;

    setMinMaxKnown();
}

//#define SPEED_DEBUG

void RenderCanvas::layout()
{
    KHTMLAssert(!view()->inLayout());

OOM_PRE_CHECK( 512*1024, 0, "RenderCanvas::layout" )

    if (m_printingMode)
       m_minWidth = m_width;

    setChildNeedsLayout(true);
    setMinMaxKnown(false);
    for (RenderObject *c = firstChild(); c; c = c->nextSibling())
        c->setChildNeedsLayout(true);

#ifdef SPEED_DEBUG
    QTime qt;
    qt.start();
#endif
    if ( recalcMinMax() )
	recalcMinMaxWidths();
#ifdef SPEED_DEBUG
    kdDebug() << "RenderCanvas::calcMinMax time used=" << qt.elapsed() << endl;
    qt.start();
#endif

#ifdef SPEED_DEBUG
    kdDebug() << "RenderCanvas::layout time used=" << qt.elapsed() << endl;
    qt.start();
#endif

#if NOKIA_CHANGES

    int constraintWidth = m_view->visibleWidth();
    int limitWidth = QMIN(NOKIA_MIN_WIDTH_LIMIT,m_minWidth);
    if (!document()->isXHtmlMobile() && constraintWidth<limitWidth)
        constraintWidth = limitWidth;

    if (!m_printingMode) {
        m_viewportWidth = m_width = constraintWidth;
        m_viewportHeight = m_height = m_view->visibleHeight();
    }
    else {
        m_width = m_rootWidth;
        m_height = m_rootHeight;
    }

    RenderBlock::layout();

    int docw = docWidth();
    int doch = docHeight();

    if (!m_printingMode) {
        setWidth( m_viewportWidth = constraintWidth );
        setHeight(  m_viewportHeight = m_view->visibleHeight() );
    }
#else
    if (!m_printingMode) {
        m_viewportWidth = m_width = m_view->visibleWidth();
        m_viewportHeight = m_height = m_view->visibleHeight();
    }
    else {
        m_width = m_rootWidth;
        m_height = m_rootHeight;
    }

    RenderBlock::layout();

    int docw = docWidth();
    int doch = docHeight();

    if (!m_printingMode) {
        setWidth( m_viewportWidth = m_view->visibleWidth() );
        setHeight(  m_viewportHeight = m_view->visibleHeight() );
    }

#endif
    // ### we could maybe do the call below better and only pass true if the docsize changed.
    layoutPositionedObjects( true );

#ifdef SPEED_DEBUG
    kdDebug() << "RenderCanvas::end time used=" << qt.elapsed() << endl;
#endif

    layer()->setHeight(kMax(doch, m_height));
    layer()->setWidth(kMax(docw, m_width));

    setNeedsLayout(false);

OOM_POST_CHECK_FAILED(    setNeedsLayout(false); return;)
}

bool RenderCanvas::absolutePosition(int &xPos, int &yPos, bool f)
{
    if ( f && m_view) {
	xPos = m_view->contentsX();
	yPos = m_view->contentsY();
    }
    else {
        xPos = yPos = 0;
    }
    return true;
}

void RenderCanvas::paint(PaintInfo& i, int _tx, int _ty)
{
#ifdef DEBUG_LAYOUT
    kdDebug( 6040 ) << renderName() << "(RenderCanvas) " << this << " ::paintObject() w/h = (" << width() << "/" << height() << ")" << endl;
#endif

    // Cache the print rect because the dirty rect could get changed during painting.
    if (m_printingMode) {
        setPrintRect(i.r);
    }

    // 1. paint background, borders etc
    if (i.phase == PaintActionBlockBackground) {
        paintBoxDecorations(i, _tx, _ty);
        return;
    }

    // 2. paint contents
    for (RenderObject *child = firstChild(); child; child = child->nextSibling())
        if (!child->layer() && !child->isFloating())
            child->paint(i, _tx, _ty);

    if (m_view)
    {
        _tx += m_view->contentsX();
        _ty += m_view->contentsY();
    }

    // 3. paint floats.
    if (i.phase == PaintActionFloat)
        paintFloats(i, _tx, _ty);

#ifdef BOX_DEBUG
    outlineBox(i.p, _tx, _ty);
#endif
}

void RenderCanvas::paintBoxDecorations(PaintInfo& i, int _tx, int _ty)
{
    // Check to see if we are enclosed by a transparent layer.  If so, we cannot blit
    // when scrolling, and we need to use slow repaints.
    DOM::ElementImpl* elt = element()->getDocument()->ownerElement();
    if (view() && elt) {
        RenderLayer* layer = elt->renderer()->enclosingLayer();
        if (layer->isTransparent() || layer->transparentAncestor())
            view()->useSlowRepaints();
    }

    if ((firstChild() && firstChild()->style()->visibility() == VISIBLE) || !view())
        return;

    // This code typically only executes if the root element's visibility has been set to hidden.
    // Only fill with a base color (e.g., white) if we're the root document, since iframes/frames with
    // no background in the child document should show the parent's background.
    if (elt || view()->isTransparent())
        view()->useSlowRepaints(); // The parent must show behind the child.
    else
        i.p->fillRect(i.r.x(), i.r.y(), i.r.width(), i.r.height(),
                    view()->palette().active().color(QColorGroup::Base));
}

void RenderCanvas::repaintViewRectangle(const QRect& ur, bool immediate)
{
    if (m_printingMode || ur.width() == 0 || ur.height() == 0) return;

    QRect vr = viewRect();
    if (m_view && ur.intersects(vr)) {
        // We always just invalidate the root view, since we could be an iframe that is clipped out
        // or even invisible.
        QRect r = ur.intersect(vr);
        DOM::ElementImpl* elt = element()->getDocument()->ownerElement();
        if (!elt)
            m_view->repaintRectangle(r, immediate);
        else {
            // Subtract out the contentsX and contentsY offsets to get our coords within the viewing
            // rectangle.
            r.setX(r.x() - m_view->contentsX());
            r.setY(r.y() - m_view->contentsY());

            RenderObject* obj = elt->renderer();
            int yFrameOffset = (m_view->frameStyle() != QFrame::NoFrame) ? 2 : 0;
            int xFrameOffset = (m_view->frameStyle() != QFrame::NoFrame) ? 1 : 0;
            r.setX(r.x() + obj->borderLeft()+obj->paddingLeft() + xFrameOffset);
            r.setY(r.y() + obj->borderTop()+obj->paddingTop() + yFrameOffset);
            obj->repaintRectangle(r, immediate);
        }
    }
}

QRect RenderCanvas::getAbsoluteRepaintRect()
{
    QRect result;
    if (m_view && !m_printingMode)