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Screen.cpp
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Screen.cpp
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/*
This file is part of Konsole, an X terminal.
Copyright (C) 1997,1998 by Lars Doelle <[email protected]>
Rewritten for QT4 by e_k <e_k at users.sourceforge.net>, Copyright (C)2008
Ported to Blackberry Playbook by BGmot <[email protected]>, 2012
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.
*/
// Own
#include "Screen.h"
// Standard
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <assert.h>
#include <string.h>
#include <ctype.h>
// Qt
#include <QtCore/QTextStream>
#include <QtCore/QDate>
// Konsole
#include "konsole_wcwidth.h"
#include "TerminalCharacterDecoder.h"
using namespace Konsole;
//FIXME: this is emulation specific. Use false for xterm, true for ANSI.
//FIXME: see if we can get this from terminfo.
#define BS_CLEARS false
//Macro to convert x,y position on screen to position within an image.
//
//Originally the image was stored as one large contiguous block of
//memory, so a position within the image could be represented as an
//offset from the beginning of the block. For efficiency reasons this
//is no longer the case.
//Many internal parts of this class still use this representation for parameters and so on,
//notably moveImage() and clearImage().
//This macro converts from an X,Y position into an image offset.
#ifndef loc
#define loc(X,Y) ((Y)*columns+(X))
#endif
Character Screen::defaultChar = Character(' ',
CharacterColor(COLOR_SPACE_DEFAULT,DEFAULT_FORE_COLOR),
CharacterColor(COLOR_SPACE_DEFAULT,DEFAULT_BACK_COLOR),
DEFAULT_RENDITION);
//#define REVERSE_WRAPPED_LINES // for wrapped line debug
Screen::Screen(int l, int c)
: lines(l),
columns(c),
screenLines(new ImageLine[lines+1] ),
_scrolledLines(0),
_droppedLines(0),
hist(new HistoryScrollNone()),
cuX(0), cuY(0),
cu_re(0),
tmargin(0), bmargin(0),
tabstops(0),
sel_begin(0), sel_TL(0), sel_BR(0),
sel_busy(false),
columnmode(false),
ef_fg(CharacterColor()), ef_bg(CharacterColor()), ef_re(0),
sa_cuX(0), sa_cuY(0),
sa_cu_re(0),
lastPos(-1)
{
lineProperties.resize(lines+1);
for (int i=0;i<lines+1;i++)
lineProperties[i]=LINE_DEFAULT;
initTabStops();
clearSelection();
reset();
}
/*! Destructor
*/
Screen::~Screen()
{
delete[] screenLines;
delete[] tabstops;
delete hist;
}
/* ------------------------------------------------------------------------- */
/* */
/* Normalized Screen Operations */
/* */
/* ------------------------------------------------------------------------- */
// Cursor Setting --------------------------------------------------------------
/*! \section Cursor
The `cursor' is a location within the screen that is implicitely used in
many operations. The operations within this section allow to manipulate
the cursor explicitly and to obtain it's value.
The position of the cursor is guarantied to be between (including) 0 and
`columns-1' and `lines-1'.
*/
/*!
Move the cursor up.
The cursor will not be moved beyond the top margin.
*/
void Screen::cursorUp(int n)
//=CUU
{
if (n == 0) n = 1; // Default
int stop = cuY < tmargin ? 0 : tmargin;
cuX = qMin(columns-1,cuX); // nowrap!
cuY = qMax(stop,cuY-n);
}
/*!
Move the cursor down.
The cursor will not be moved beyond the bottom margin.
*/
void Screen::cursorDown(int n)
//=CUD
{
if (n == 0) n = 1; // Default
int stop = cuY > bmargin ? lines-1 : bmargin;
cuX = qMin(columns-1,cuX); // nowrap!
cuY = qMin(stop,cuY+n);
}
/*!
Move the cursor left.
The cursor will not move beyond the first column.
*/
void Screen::cursorLeft(int n)
//=CUB
{
if (n == 0) n = 1; // Default
cuX = qMin(columns-1,cuX); // nowrap!
cuX = qMax(0,cuX-n);
}
/*!
Move the cursor left.
The cursor will not move beyond the rightmost column.
*/
void Screen::cursorRight(int n)
//=CUF
{
if (n == 0) n = 1; // Default
cuX = qMin(columns-1,cuX+n);
}
void Screen::setMargins(int top, int bot)
//=STBM
{
if (top == 0) top = 1; // Default
if (bot == 0) bot = lines; // Default
top = top - 1; // Adjust to internal lineno
bot = bot - 1; // Adjust to internal lineno
if ( !( 0 <= top && top < bot && bot < lines ) )
{ qDebug()<<" setRegion("<<top<<","<<bot<<") : bad range.";
return; // Default error action: ignore
}
tmargin = top;
bmargin = bot;
cuX = 0;
cuY = getMode(MODE_Origin) ? top : 0;
}
int Screen::topMargin() const
{
return tmargin;
}
int Screen::bottomMargin() const
{
return bmargin;
}
void Screen::index()
//=IND
{
if (cuY == bmargin)
{
scrollUp(1);
}
else if (cuY < lines-1)
cuY += 1;
}
void Screen::reverseIndex()
//=RI
{
if (cuY == tmargin)
scrollDown(tmargin,1);
else if (cuY > 0)
cuY -= 1;
}
/*!
Move the cursor to the begin of the next line.
If cursor is on bottom margin, the region between the
actual top and bottom margin is scrolled up.
*/
void Screen::NextLine()
//=NEL
{
Return(); index();
}
void Screen::eraseChars(int n)
{
if (n == 0) n = 1; // Default
int p = qMax(0,qMin(cuX+n-1,columns-1));
clearImage(loc(cuX,cuY),loc(p,cuY),' ');
}
void Screen::deleteChars(int n)
{
Q_ASSERT( n >= 0 );
// always delete at least one char
if (n == 0)
n = 1;
// if cursor is beyond the end of the line there is nothing to do
if ( cuX >= screenLines[cuY].count() )
return;
if ( cuX+n >= screenLines[cuY].count() )
n = screenLines[cuY].count() - 1 - cuX;
Q_ASSERT( n >= 0 );
Q_ASSERT( cuX+n < screenLines[cuY].count() );
screenLines[cuY].remove(cuX,n);
}
void Screen::insertChars(int n)
{
if (n == 0) n = 1; // Default
if ( screenLines[cuY].size() < cuX )
screenLines[cuY].resize(cuX);
screenLines[cuY].insert(cuX,n,' ');
if ( screenLines[cuY].count() > columns )
screenLines[cuY].resize(columns);
}
void Screen::deleteLines(int n)
{
if (n == 0) n = 1; // Default
scrollUp(cuY,n);
}
/*! insert `n' lines at the cursor position.
The cursor is not moved by the operation.
*/
void Screen::insertLines(int n)
{
if (n == 0) n = 1; // Default
scrollDown(cuY,n);
}
// Mode Operations -----------------------------------------------------------
/*! Set a specific mode. */
void Screen::setMode(int m)
{
currParm.mode[m] = true;
switch(m)
{
case MODE_Origin : cuX = 0; cuY = tmargin; break; //FIXME: home
}
}
/*! Reset a specific mode. */
void Screen::resetMode(int m)
{
currParm.mode[m] = false;
switch(m)
{
case MODE_Origin : cuX = 0; cuY = 0; break; //FIXME: home
}
}
/*! Save a specific mode. */
void Screen::saveMode(int m)
{
saveParm.mode[m] = currParm.mode[m];
}
/*! Restore a specific mode. */
void Screen::restoreMode(int m)
{
currParm.mode[m] = saveParm.mode[m];
}
bool Screen::getMode(int m) const
{
return currParm.mode[m];
}
void Screen::saveCursor()
{
sa_cuX = cuX;
sa_cuY = cuY;
sa_cu_re = cu_re;
sa_cu_fg = cu_fg;
sa_cu_bg = cu_bg;
}
void Screen::restoreCursor()
{
cuX = qMin(sa_cuX,columns-1);
cuY = qMin(sa_cuY,lines-1);
cu_re = sa_cu_re;
cu_fg = sa_cu_fg;
cu_bg = sa_cu_bg;
effectiveRendition();
}
/* ------------------------------------------------------------------------- */
/* */
/* Screen Operations */
/* */
/* ------------------------------------------------------------------------- */
/*! Resize the screen image
The topmost left position is maintained, while lower lines
or right hand side columns might be removed or filled with
spaces to fit the new size.
The region setting is reset to the whole screen and the
tab positions reinitialized.
If the new image is narrower than the old image then text on lines
which extends past the end of the new image is preserved so that it becomes
visible again if the screen is later resized to make it larger.
*/
void Screen::resizeImage(int new_lines, int new_columns)
{
if ((new_lines==lines) && (new_columns==columns)) return;
if (cuY > new_lines-1)
{ // attempt to preserve focus and lines
bmargin = lines-1; //FIXME: margin lost
for (int i = 0; i < cuY-(new_lines-1); i++)
{
addHistLine(); scrollUp(0,1);
}
}
// create new screen lines and copy from old to new
ImageLine* newScreenLines = new ImageLine[new_lines+1];
for (int i=0; i < qMin(lines-1,new_lines+1) ;i++)
newScreenLines[i]=screenLines[i];
for (int i=lines;(i > 0) && (i<new_lines+1);i++)
newScreenLines[i].resize( new_columns );
lineProperties.resize(new_lines+1);
for (int i=lines;(i > 0) && (i<new_lines+1);i++)
lineProperties[i] = LINE_DEFAULT;
clearSelection();
delete[] screenLines;
screenLines = newScreenLines;
lines = new_lines;
columns = new_columns;
cuX = qMin(cuX,columns-1);
cuY = qMin(cuY,lines-1);
// FIXME: try to keep values, evtl.
tmargin=0;
bmargin=lines-1;
initTabStops();
clearSelection();
}
void Screen::setDefaultMargins()
{
tmargin = 0;
bmargin = lines-1;
}
/*
Clarifying rendition here and in the display.
currently, the display's color table is
0 1 2 .. 9 10 .. 17
dft_fg, dft_bg, dim 0..7, intensive 0..7
cu_fg, cu_bg contain values 0..8;
- 0 = default color
- 1..8 = ansi specified color
re_fg, re_bg contain values 0..17
due to the TerminalDisplay's color table
rendition attributes are
attr widget screen
-------------- ------ ------
RE_UNDERLINE XX XX affects foreground only
RE_BLINK XX XX affects foreground only
RE_BOLD XX XX affects foreground only
RE_REVERSE -- XX
RE_TRANSPARENT XX -- affects background only
RE_INTENSIVE XX -- affects foreground only
Note that RE_BOLD is used in both widget
and screen rendition. Since xterm/vt102
is to poor to distinguish between bold
(which is a font attribute) and intensive
(which is a color attribute), we translate
this and RE_BOLD in falls eventually appart
into RE_BOLD and RE_INTENSIVE.
*/
void Screen::reverseRendition(Character& p) const
{
CharacterColor f = p.foregroundColor;
CharacterColor b = p.backgroundColor;
p.foregroundColor = b;
p.backgroundColor = f; //p->r &= ~RE_TRANSPARENT;
}
void Screen::effectiveRendition()
// calculate rendition
{
//copy "current rendition" straight into "effective rendition", which is then later copied directly
//into the image[] array which holds the characters and their appearance properties.
//- The old version below filtered out all attributes other than underline and blink at this stage,
//so that they would not be copied into the image[] array and hence would not be visible by TerminalDisplay
//which actually paints the screen using the information from the image[] array.
//I don't know why it did this, but I'm fairly sure it was the wrong thing to do. The net result
//was that bold text wasn't printed in bold by Konsole.
ef_re = cu_re;
//OLD VERSION:
//ef_re = cu_re & (RE_UNDERLINE | RE_BLINK);
if (cu_re & RE_REVERSE)
{
ef_fg = cu_bg;
ef_bg = cu_fg;
}
else
{
ef_fg = cu_fg;
ef_bg = cu_bg;
}
if (cu_re & RE_BOLD)
ef_fg.toggleIntensive();
}
/*!
returns the image.
Get the size of the image by \sa getLines and \sa getColumns.
NOTE that the image returned by this function must later be
freed.
*/
void Screen::copyFromHistory(Character* dest, int startLine, int count) const
{
Q_ASSERT( startLine >= 0 && count > 0 && startLine + count <= hist->getLines() );
for (int line = startLine; line < startLine + count; line++)
{
const int length = qMin(columns,hist->getLineLen(line));
const int destLineOffset = (line-startLine)*columns;
hist->getCells(line,0,length,dest + destLineOffset);
for (int column = length; column < columns; column++)
dest[destLineOffset+column] = defaultChar;
// invert selected text
if (sel_begin !=-1)
{
for (int column = 0; column < columns; column++)
{
if (isSelected(column,line))
{
reverseRendition(dest[destLineOffset + column]);
}
}
}
}
}
void Screen::copyFromScreen(Character* dest , int startLine , int count) const
{
Q_ASSERT( startLine >= 0 && count > 0 && startLine + count <= lines );
for (int line = startLine; line < (startLine+count) ; line++)
{
int srcLineStartIndex = line*columns;
int destLineStartIndex = (line-startLine)*columns;
for (int column = 0; column < columns; column++)
{
int srcIndex = srcLineStartIndex + column;
int destIndex = destLineStartIndex + column;
dest[destIndex] = screenLines[srcIndex/columns].value(srcIndex%columns,defaultChar);
// invert selected text
if (sel_begin != -1 && isSelected(column,line + hist->getLines()))
reverseRendition(dest[destIndex]);
}
}
}
void Screen::getImage( Character* dest, int size, int startLine, int endLine ) const
{
Q_ASSERT( startLine >= 0 );
Q_ASSERT( endLine >= startLine && endLine < hist->getLines() + lines );
const int mergedLines = endLine - startLine + 1;
Q_ASSERT( size >= mergedLines * columns );
const int linesInHistoryBuffer = qBound(0,hist->getLines()-startLine,mergedLines);
const int linesInScreenBuffer = mergedLines - linesInHistoryBuffer;
// copy lines from history buffer
if (linesInHistoryBuffer > 0) {
copyFromHistory(dest,startLine,linesInHistoryBuffer);
}
// copy lines from screen buffer
if (linesInScreenBuffer > 0) {
copyFromScreen(dest + linesInHistoryBuffer*columns,
startLine + linesInHistoryBuffer - hist->getLines(),
linesInScreenBuffer);
}
// invert display when in screen mode
if (getMode(MODE_Screen))
{
for (int i = 0; i < mergedLines*columns; i++)
reverseRendition(dest[i]); // for reverse display
}
// mark the character at the current cursor position
int cursorIndex = loc(cuX, cuY + linesInHistoryBuffer);
if(getMode(MODE_Cursor) && cursorIndex < columns*mergedLines)
dest[cursorIndex].rendition |= RE_CURSOR;
}
QVector<LineProperty> Screen::getLineProperties( int startLine , int endLine ) const
{
Q_ASSERT( startLine >= 0 );
Q_ASSERT( endLine >= startLine && endLine < hist->getLines() + lines );
const int mergedLines = endLine-startLine+1;
const int linesInHistory = qBound(0,hist->getLines()-startLine,mergedLines);
const int linesInScreen = mergedLines - linesInHistory;
QVector<LineProperty> result(mergedLines);
int index = 0;
// copy properties for lines in history
for (int line = startLine; line < startLine + linesInHistory; line++)
{
//TODO Support for line properties other than wrapped lines
if (hist->isWrappedLine(line))
{
result[index] = (LineProperty)(result[index] | LINE_WRAPPED);
}
index++;
}
// copy properties for lines in screen buffer
const int firstScreenLine = startLine + linesInHistory - hist->getLines();
for (int line = firstScreenLine; line < firstScreenLine+linesInScreen; line++)
{
result[index]=lineProperties[line];
index++;
}
return result;
}
/*!
*/
void Screen::reset(bool clearScreen)
{
setMode(MODE_Wrap ); saveMode(MODE_Wrap ); // wrap at end of margin
resetMode(MODE_Origin); saveMode(MODE_Origin); // position refere to [1,1]
resetMode(MODE_Insert); saveMode(MODE_Insert); // overstroke
setMode(MODE_Cursor); // cursor visible
resetMode(MODE_Screen); // screen not inverse
resetMode(MODE_NewLine);
tmargin=0;
bmargin=lines-1;
setDefaultRendition();
saveCursor();
if ( clearScreen )
clear();
}
/*! Clear the entire screen and home the cursor.
*/
void Screen::clear()
{
clearEntireScreen();
home();
}
void Screen::BackSpace()
{
cuX = qMin(columns-1,cuX); // nowrap!
cuX = qMax(0,cuX-1);
// if (BS_CLEARS) image[loc(cuX,cuY)].character = ' ';
if (screenLines[cuY].size() < cuX+1)
screenLines[cuY].resize(cuX+1);
if (BS_CLEARS) screenLines[cuY][cuX].character = ' ';
}
void Screen::Tabulate(int n)
{
// note that TAB is a format effector (does not write ' ');
if (n == 0) n = 1;
while((n > 0) && (cuX < columns-1))
{
cursorRight(1); while((cuX < columns-1) && !tabstops[cuX]) cursorRight(1);
n--;
}
}
void Screen::backTabulate(int n)
{
// note that TAB is a format effector (does not write ' ');
if (n == 0) n = 1;
while((n > 0) && (cuX > 0))
{
cursorLeft(1); while((cuX > 0) && !tabstops[cuX]) cursorLeft(1);
n--;
}
}
void Screen::clearTabStops()
{
for (int i = 0; i < columns; i++) tabstops[i] = false;
}
void Screen::changeTabStop(bool set)
{
if (cuX >= columns) return;
tabstops[cuX] = set;
}
void Screen::initTabStops()
{
delete[] tabstops;
tabstops = new bool[columns];
// Arrg! The 1st tabstop has to be one longer than the other.
// i.e. the kids start counting from 0 instead of 1.
// Other programs might behave correctly. Be aware.
for (int i = 0; i < columns; i++) tabstops[i] = (i%8 == 0 && i != 0);
}
/*!
This behaves either as IND (Screen::Index) or as NEL (Screen::NextLine)
depending on the NewLine Mode (LNM). This mode also
affects the key sequence returned for newline ([CR]LF).
*/
void Screen::NewLine()
{
if (getMode(MODE_NewLine)) Return();
index();
}
/*! put `c' literally onto the screen at the current cursor position.
VT100 uses the convention to produce an automatic newline (am)
with the *first* character that would fall onto the next line (xenl).
*/
void Screen::checkSelection(int from, int to)
{
if (sel_begin == -1) return;
int scr_TL = loc(0, hist->getLines());
//Clear entire selection if it overlaps region [from, to]
if ( (sel_BR > (from+scr_TL) )&&(sel_TL < (to+scr_TL)) )
{
clearSelection();
}
}
void Screen::ShowCharacter(unsigned short c)
{
// Note that VT100 does wrapping BEFORE putting the character.
// This has impact on the assumption of valid cursor positions.
// We indicate the fact that a newline has to be triggered by
// putting the cursor one right to the last column of the screen.
int w = konsole_wcwidth(c);
if (w <= 0)
return;
if (cuX+w > columns) {
if (getMode(MODE_Wrap)) {
lineProperties[cuY] = (LineProperty)(lineProperties[cuY] | LINE_WRAPPED);
NextLine();
}
else
cuX = columns-w;
}
// ensure current line vector has enough elements
int size = screenLines[cuY].size();
if (size == 0 && cuY > 0)
{
screenLines[cuY].resize( qMax(screenLines[cuY-1].size() , cuX+w) );
}
else
{
if (size < cuX+w)
{
screenLines[cuY].resize(cuX+w);
}
}
if (getMode(MODE_Insert)) insertChars(w);
lastPos = loc(cuX,cuY);
// check if selection is still valid.
checkSelection(cuX,cuY);
Character& currentChar = screenLines[cuY][cuX];
currentChar.character = c;
currentChar.foregroundColor = ef_fg;
currentChar.backgroundColor = ef_bg;
currentChar.rendition = ef_re;
int i = 0;
int newCursorX = cuX + w--;
while(w)
{
i++;
if ( screenLines[cuY].size() < cuX + i + 1 )
screenLines[cuY].resize(cuX+i+1);
Character& ch = screenLines[cuY][cuX + i];
ch.character = 0;
ch.foregroundColor = ef_fg;
ch.backgroundColor = ef_bg;
ch.rendition = ef_re;
w--;
}
cuX = newCursorX;
}
void Screen::compose(const QString& /*compose*/)
{
Q_ASSERT( 0 /*Not implemented yet*/ );
/* if (lastPos == -1)
return;
QChar c(image[lastPos].character);
compose.prepend(c);
//compose.compose(); ### FIXME!
image[lastPos].character = compose[0].unicode();*/
}
int Screen::scrolledLines() const
{
return _scrolledLines;
}
int Screen::droppedLines() const
{
return _droppedLines;
}
void Screen::resetDroppedLines()
{
_droppedLines = 0;
}
void Screen::resetScrolledLines()
{
//kDebug() << "scrolled lines reset";
_scrolledLines = 0;
}
// Region commands -------------------------------------------------------------
void Screen::scrollUp(int n)
{
if (n == 0) n = 1; // Default
if (tmargin == 0) addHistLine(); // hist.history
scrollUp(tmargin, n);
}
/*! scroll up `n' lines within current region.
The `n' new lines are cleared.
\sa setRegion \sa scrollDown
*/
QRect Screen::lastScrolledRegion() const
{
return _lastScrolledRegion;
}
void Screen::scrollUp(int from, int n)
{
if (n <= 0 || from + n > bmargin) return;
_scrolledLines -= n;
_lastScrolledRegion = QRect(0,tmargin,columns-1,(bmargin-tmargin));
//FIXME: make sure `tmargin', `bmargin', `from', `n' is in bounds.
moveImage(loc(0,from),loc(0,from+n),loc(columns-1,bmargin));
clearImage(loc(0,bmargin-n+1),loc(columns-1,bmargin),' ');
}
void Screen::scrollDown(int n)
{
if (n == 0) n = 1; // Default
scrollDown(tmargin, n);
}
/*! scroll down `n' lines within current region.
The `n' new lines are cleared.
\sa setRegion \sa scrollUp
*/
void Screen::scrollDown(int from, int n)
{
//kDebug() << "Screen::scrollDown( from: " << from << " , n: " << n << ")";
_scrolledLines += n;
//FIXME: make sure `tmargin', `bmargin', `from', `n' is in bounds.
if (n <= 0) return;
if (from > bmargin) return;
if (from + n > bmargin) n = bmargin - from;
moveImage(loc(0,from+n),loc(0,from),loc(columns-1,bmargin-n));
clearImage(loc(0,from),loc(columns-1,from+n-1),' ');
}
void Screen::setCursorYX(int y, int x)
{
setCursorY(y); setCursorX(x);
}
void Screen::setCursorX(int x)
{
if (x == 0) x = 1; // Default
x -= 1; // Adjust
cuX = qMax(0,qMin(columns-1, x));
}
void Screen::setCursorY(int y)
{
if (y == 0) y = 1; // Default
y -= 1; // Adjust
cuY = qMax(0,qMin(lines -1, y + (getMode(MODE_Origin) ? tmargin : 0) ));
}
void Screen::home()
{
cuX = 0;
cuY = 0;
}
void Screen::Return()
{
cuX = 0;
}
int Screen::getCursorX() const
{
return cuX;
}
int Screen::getCursorY() const
{
return cuY;
}
// Erasing ---------------------------------------------------------------------
/*! \section Erasing
This group of operations erase parts of the screen contents by filling
it with spaces colored due to the current rendition settings.
Althought the cursor position is involved in most of these operations,
it is never modified by them.
*/
/*! fill screen between (including) `loca' (start) and `loce' (end) with spaces.
This is an internal helper functions. The parameter types are internal
addresses of within the screen image and make use of the way how the
screen matrix is mapped to the image vector.
*/
void Screen::clearImage(int loca, int loce, char c)
{
int scr_TL=loc(0,hist->getLines());
//FIXME: check positions
//Clear entire selection if it overlaps region to be moved...
if ( (sel_BR > (loca+scr_TL) )&&(sel_TL < (loce+scr_TL)) )
{
clearSelection();
}
int topLine = loca/columns;
int bottomLine = loce/columns;
Character clearCh(c,cu_fg,cu_bg,DEFAULT_RENDITION);
//if the character being used to clear the area is the same as the
//default character, the affected lines can simply be shrunk.
bool isDefaultCh = (clearCh == Character());
for (int y=topLine;y<=bottomLine;y++)
{
lineProperties[y] = 0;
int endCol = ( y == bottomLine) ? loce%columns : columns-1;
int startCol = ( y == topLine ) ? loca%columns : 0;
QVector<Character>& line = screenLines[y];
if ( isDefaultCh && endCol == columns-1 )