render_style.h

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/*
 * This file is part of the DOM implementation for KDE.
 *
 * Copyright (C) 2000 Lars Knoll ([e-mail])
 *           (C) 2000 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.
 *
 */
#ifndef RENDERSTYLE_H
#define RENDERSTYLE_H

/*
 * WARNING:
 * --------
 *
 * The order of the values in the enums have to agree with the order specified
 * in cssvalues.in, otherwise some optimizations in the parser will fail,
 * and produce invaliud results.
 */

#include <qcolor.h>
#include <qfont.h>
#include <qfontmetrics.h>
#include <qlist.h>
#include <qpalette.h>
#include <qapplication.h>

#include "dom/dom_misc.h"
#include "misc/khtmllayout.h"
#include "misc/shared.h"
#include "rendering/font.h"

#include <assert.h>

#ifdef __WINSCW__
#pragma enumsalwaysint off
#endif

#define SET_VAR(group,variable,value) \
    if (!(group->variable == value)) \
        group.access()->variable = value;

class RenderArena;

namespace DOM {
    class DOMStringImpl;
    class ShadowValueImpl;
}

namespace khtml {

    class CachedImage;
    class CachedObject;

template <class DATA>
class DataRef
OOM_MODIFIED
{
public:

    DataRef()
    {
	data=0;
    }
    DataRef( const DataRef<DATA> &d )
    {
    	data = d.data;
	data->ref();
    }

    ~DataRef()
    {
    	if(data) data->deref();
    }

    const DATA* operator->() const
    {
    	return data;
    }

    const DATA* get() const
    {
    	return data;
    }


    DATA* access()
    {
    	if (!data->hasOneRef())
	{
	    data->deref();
	    data = new DATA(*data);
	    data->ref();
	}
	return data;
    }

    void init()
    {
    	data = new DATA;
	data->ref();
    }

    DataRef<DATA>& operator=(const DataRef<DATA>& d)
    {
    	if (data==d.data)
	    return *this;
    	if (data)
    	    data->deref();
    	data = d.data;

	data->ref();

	return *this;
    }

    bool operator == ( const DataRef<DATA> &o ) const {
	return (*data == *(o.data) );
    }
    bool operator != ( const DataRef<DATA> &o ) const {
	return (*data != *(o.data) );
    }

private:
    DATA* data;
};

enum PseudoState { PseudoUnknown, PseudoNone, PseudoAnyLink, PseudoLink, PseudoVisited};

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

//------------------------------------------------
// Box model attributes. Not inherited.

struct LengthBox
{
    LengthBox()
    {
    }
    LengthBox( LengthType t )
	: left( t ), right ( t ), top( t ), bottom( t ) {}

    Length left;
    Length right;
    Length top;
    Length bottom;
    Length& operator=(Length& len)
    {
    	left=len;
	right=len;
	top=len;
	bottom=len;
	return len;
    }

    bool operator==(const LengthBox& o) const
    {
    	return left==o.left && right==o.right && top==o.top && bottom==o.bottom;
    }


    bool nonZero() const { return left.value!=0 || right.value!=0 || top.value!=0 || bottom.value!=0; }
};



enum EPosition {
    STATIC, RELATIVE, ABSOLUTE, FIXED
};

enum EFloat {
    FNONE = 0, FLEFT, FRIGHT
};


//------------------------------------------------
// Border attributes. Not inherited.

// These have been defined in the order of their precedence for border-collapsing. Do
// not change this order!
enum EBorderStyle {
    BNONE, BHIDDEN, INSET, GROOVE, RIDGE, OUTSET, DOTTED, DASHED, SOLID, DOUBLE
};

class BorderValue
OOM_MODIFIED
{
public:
    BorderValue()
    {
	width = 3; // medium is default value
        style = BNONE;
    }
    QColor color;
    unsigned short width : 12;
    EBorderStyle style : 4;

    bool nonZero() const
    {
      // rikkus: workaround for gcc 2.95.3
      return width!=0 && !(style==BNONE);
    }

    bool isTransparent() const {
        return color.isValid() && qAlpha(color.rgb()) == 0;
    }
    
    bool operator==(const BorderValue& o) const
    {
    	return width==o.width && style==o.style && color==o.color;
    }

    bool operator!=(const BorderValue& o) const
    {
        return !(*this == o);
    }
};

class OutlineValue : public BorderValue
{
public:
    OutlineValue()
    {
        _offset = 0;
        _auto = false;
    }
    
    bool operator==(const OutlineValue& o) const
    {
    	return width==o.width && style==o.style && color==o.color && _offset == o._offset && _auto == o._auto;
    }
    
    bool operator!=(const OutlineValue& o) const
    {
        return !(*this == o);
    }
    
    int _offset;
    bool _auto;
};

enum EBorderPrecedence { BOFF, BTABLE, BCOLGROUP, BCOL, BROWGROUP, BROW, BCELL };

struct CollapsedBorderValue
{
    CollapsedBorderValue() :border(0), precedence(BOFF) {}
    CollapsedBorderValue(const BorderValue* b, EBorderPrecedence p) :border(b), precedence(p) {}
    
    int width() const { return border && border->nonZero() ? border->width : 0; }
    EBorderStyle style() const { return border ? border->style : BHIDDEN; }
    bool exists() const { return border; }
    QColor color() const { return border ? border->color : QColor(); }
    bool isTransparent() const { return border ? border->isTransparent() : true; }
    
    bool operator==(const CollapsedBorderValue& o) const
    {
        if (!border) return !o.border;
        if (!o.border) return false;
        return *border == *o.border && precedence == o.precedence;
    }
    
    const BorderValue* border;
    EBorderPrecedence precedence;    
};

class BorderData
OOM_MODIFIED
{
public:
    BorderValue left;
    BorderValue right;
    BorderValue top;
    BorderValue bottom;

    bool hasBorder() const
    {
    	return left.nonZero() || right.nonZero() || top.nonZero() || bottom.nonZero();
    }

    bool operator==(const BorderData& o) const
    {
    	return left==o.left && right==o.right && top==o.top && bottom==o.bottom;
    }

};

enum EMarginCollapse { MCOLLAPSE, MSEPARATE, MDISCARD };

class StyleSurroundData : public Shared<StyleSurroundData>
{
public:
    StyleSurroundData();

    StyleSurroundData(const StyleSurroundData& o );
    bool operator==(const StyleSurroundData& o) const;
    bool operator!=(const StyleSurroundData& o) const {
        return !(*this == o);
    }

    LengthBox offset;
    LengthBox margin;
    LengthBox padding;
    BorderData border;
};