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/*
This file is part of Konsole, KDE's terminal.
Copyright (C) 2007 by Robert Knight <robertknight@gmail.com>
Copyright (C) 1997,1998 by Lars Doelle <lars.doelle@on-line.de>
Rewritten for QT4 by e_k <e_k at users.sourceforge.net>, Copyright (C)2008
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.
*/
#ifndef CHARACTER_H
#define CHARACTER_H
// Qt
#include <QtCore/QHash>
// Local
#include "CharacterColor.h"
namespace Konsole
{
typedef unsigned char LineProperty;
static const int LINE_DEFAULT = 0;
static const int LINE_WRAPPED = (1 << 0);
static const int LINE_DOUBLEWIDTH = (1 << 1);
static const int LINE_DOUBLEHEIGHT = (1 << 2);
#define DEFAULT_RENDITION 0
#define RE_BOLD (1 << 0)
#define RE_BLINK (1 << 1)
#define RE_UNDERLINE (1 << 2)
#define RE_REVERSE (1 << 3) // Screen only
#define RE_INTENSIVE (1 << 3) // Widget only
#define RE_CURSOR (1 << 4)
#define RE_EXTENDED_CHAR (1 << 5)
/**
* A single character in the terminal which consists of a unicode character
* value, foreground and background colors and a set of rendition attributes
* which specify how it should be drawn.
*/
class Character
{
public:
/**
* Constructs a new character.
*
* @param _c The unicode character value of this character.
* @param _f The foreground color used to draw the character.
* @param _b The color used to draw the character's background.
* @param _r A set of rendition flags which specify how this character is to be drawn.
*/
inline Character(quint16 _c = ' ',
CharacterColor _f = CharacterColor(COLOR_SPACE_DEFAULT,DEFAULT_FORE_COLOR),
CharacterColor _b = CharacterColor(COLOR_SPACE_DEFAULT,DEFAULT_BACK_COLOR),
quint8 _r = DEFAULT_RENDITION)
: character(_c), rendition(_r), foregroundColor(_f), backgroundColor(_b) {}
union
{
/** The unicode character value for this character. */
quint16 character;
/**
* Experimental addition which allows a single Character instance to contain more than
* one unicode character.
*
* charSequence is a hash code which can be used to look up the unicode
* character sequence in the ExtendedCharTable used to create the sequence.
*/
quint16 charSequence;
};
/** A combination of RENDITION flags which specify options for drawing the character. */
quint8 rendition;
/** The foreground color used to draw this character. */
CharacterColor foregroundColor;
/** The color used to draw this character's background. */
CharacterColor backgroundColor;
/**
* Returns true if this character has a transparent background when
* it is drawn with the specified @p palette.
*/
bool isTransparent(const ColorEntry* palette) const;
/**
* Returns true if this character should always be drawn in bold when
* it is drawn with the specified @p palette, independent of whether
* or not the character has the RE_BOLD rendition flag.
*/
bool isBold(const ColorEntry* base) const;
/**
* Compares two characters and returns true if they have the same unicode character value,
* rendition and colors.
*/
friend bool operator == (const Character& a, const Character& b);
/**
* Compares two characters and returns true if they have different unicode character values,
* renditions or colors.
*/
friend bool operator != (const Character& a, const Character& b);
};
inline bool operator == (const Character& a, const Character& b)
{
return a.character == b.character &&
a.rendition == b.rendition &&
a.foregroundColor == b.foregroundColor &&
a.backgroundColor == b.backgroundColor;
}
inline bool operator != (const Character& a, const Character& b)
{
return a.character != b.character ||
a.rendition != b.rendition ||
a.foregroundColor != b.foregroundColor ||
a.backgroundColor != b.backgroundColor;
}
inline bool Character::isTransparent(const ColorEntry* base) const
{
return ((backgroundColor._colorSpace == COLOR_SPACE_DEFAULT) &&
base[backgroundColor._u+0+(backgroundColor._v?BASE_COLORS:0)].transparent)
|| ((backgroundColor._colorSpace == COLOR_SPACE_SYSTEM) &&
base[backgroundColor._u+2+(backgroundColor._v?BASE_COLORS:0)].transparent);
}
inline bool Character::isBold(const ColorEntry* base) const
{
return ((backgroundColor._colorSpace == COLOR_SPACE_DEFAULT) &&
base[backgroundColor._u+0+(backgroundColor._v?BASE_COLORS:0)].bold)
|| ((backgroundColor._colorSpace == COLOR_SPACE_SYSTEM) &&
base[backgroundColor._u+2+(backgroundColor._v?BASE_COLORS:0)].bold);
}
extern unsigned short vt100_graphics[32];
/**
* A table which stores sequences of unicode characters, referenced
* by hash keys. The hash key itself is the same size as a unicode
* character ( ushort ) so that it can occupy the same space in
* a structure.
*/
class ExtendedCharTable
{
public:
/** Constructs a new character table. */
ExtendedCharTable();
~ExtendedCharTable();
/**
* Adds a sequences of unicode characters to the table and returns
* a hash code which can be used later to look up the sequence
* using lookupExtendedChar()
*
* If the same sequence already exists in the table, the hash
* of the existing sequence will be returned.
*
* @param unicodePoints An array of unicode character points
* @param length Length of @p unicodePoints
*/
ushort createExtendedChar(ushort* unicodePoints , ushort length);
/**
* Looks up and returns a pointer to a sequence of unicode characters
* which was added to the table using createExtendedChar().
*
* @param hash The hash key returned by createExtendedChar()
* @param length This variable is set to the length of the
* character sequence.
*
* @return A unicode character sequence of size @p length.
*/
ushort* lookupExtendedChar(ushort hash , ushort& length) const;
/** The global ExtendedCharTable instance. */
static ExtendedCharTable instance;
private:
// calculates the hash key of a sequence of unicode points of size 'length'
ushort extendedCharHash(ushort* unicodePoints , ushort length) const;
// tests whether the entry in the table specified by 'hash' matches the
// character sequence 'unicodePoints' of size 'length'
bool extendedCharMatch(ushort hash , ushort* unicodePoints , ushort length) const;
// internal, maps hash keys to character sequence buffers. The first ushort
// in each value is the length of the buffer, followed by the ushorts in the buffer
// themselves.
QHash<ushort,ushort*> extendedCharTable;
};
}
#endif // CHARACTER_H
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