status_t
BasicTerminalBuffer::_ResizeHistory(int32 width, int32 historyCapacity)
{
if (width == fWidth && historyCapacity == HistoryCapacity())
return B_OK;
if (historyCapacity <= 0) {
// new history capacity is 0 -- delete the old history object
delete fHistory;
fHistory = NULL;
return B_OK;
}
HistoryBuffer* history = new(std::nothrow) HistoryBuffer;
if (history == NULL)
return B_NO_MEMORY;
status_t error = history->Init(width, historyCapacity);
if (error != B_OK) {
delete history;
return error;
}
// Transfer the lines from the old history to the new one.
if (fHistory != NULL) {
int32 historySize = min_c(HistorySize(), historyCapacity);
TerminalLine* lineBuffer = ALLOC_LINE_ON_STACK(fWidth);
for (int32 i = historySize - 1; i >= 0; i--) {
TerminalLine* line = fHistory->GetTerminalLineAt(i, lineBuffer);
if (line->length > width)
_TruncateLine(line, width);
history->AddLine(line);
}
}
delete fHistory;
fHistory = history;
return B_OK;
}
status_t
BasicTerminalBuffer::_ResizeRewrap(int32 width, int32 height,
int32 historyCapacity)
{
//debug_printf("BasicTerminalBuffer::_ResizeRewrap(): (%ld, %ld, history: %ld) -> "
//"(%ld, %ld, history: %ld)\n", fWidth, fHeight, HistoryCapacity(), width, height,
//historyCapacity);
// The width stays the same. _ResizeSimple() does exactly what we need.
if (width == fWidth)
return _ResizeSimple(width, height, historyCapacity);
// The width changes. We have to allocate a new line array, a new history
// and re-wrap all lines.
TerminalLine** screen = _AllocateLines(width, height);
if (screen == NULL)
return B_NO_MEMORY;
HistoryBuffer* history = NULL;
if (historyCapacity > 0) {
history = new(std::nothrow) HistoryBuffer;
if (history == NULL) {
_FreeLines(screen, height);
return B_NO_MEMORY;
}
status_t error = history->Init(width, historyCapacity);
if (error != B_OK) {
_FreeLines(screen, height);
delete history;
return error;
}
}
int32 historySize = HistorySize();
int32 totalLines = historySize + fHeight;
// re-wrap
TerminalLine* lineBuffer = ALLOC_LINE_ON_STACK(fWidth);
TermPos cursor;
int32 destIndex = 0;
int32 sourceIndex = 0;
int32 sourceX = 0;
int32 destTotalLines = 0;
int32 destScreenOffset = 0;
int32 maxDestTotalLines = INT_MAX;
bool newDestLine = true;
bool cursorSeen = false;
TerminalLine* sourceLine = _HistoryLineAt(-historySize, lineBuffer);
while (sourceIndex < totalLines) {
TerminalLine* destLine = screen[destIndex];
if (newDestLine) {
// Clear a new dest line before using it. If we're about to
// overwrite an previously written line, we push it to the
// history first, though.
if (history != NULL && destTotalLines >= height)
history->AddLine(screen[destIndex]);
destLine->Clear(fAttributes, width);
newDestLine = false;
}
int32 sourceLeft = sourceLine->length - sourceX;
int32 destLeft = width - destLine->length;
//debug_printf(" source: %ld, left: %ld, dest: %ld, left: %ld\n",
//sourceIndex, sourceLeft, destIndex, destLeft);
if (sourceIndex == historySize && sourceX == 0) {
destScreenOffset = destTotalLines;
if (destLeft == 0 && sourceLeft > 0)
destScreenOffset++;
maxDestTotalLines = destScreenOffset + height;
//debug_printf(" destScreenOffset: %ld\n", destScreenOffset);
}
int32 toCopy = min_c(sourceLeft, destLeft);
// If the last cell to copy is the first cell of a
// full-width char, don't copy it yet.
if (toCopy > 0 && IS_WIDTH(
sourceLine->cells[sourceX + toCopy - 1].attributes)) {
//debug_printf(" -> last char is full-width -- don't copy it\n");
toCopy--;
}
// translate the cursor position
if (fCursor.y + historySize == sourceIndex
&& fCursor.x >= sourceX
&& (fCursor.x < sourceX + toCopy
|| (destLeft >= sourceLeft
&& sourceX + sourceLeft <= fCursor.x))) {
cursor.x = destLine->length + fCursor.x - sourceX;
cursor.y = destTotalLines;
if (cursor.x >= width) {
// The cursor was in free space after the official end
// of line.
cursor.x = width - 1;
}
//debug_printf(" cursor: (%ld, %ld)\n", cursor.x, cursor.y);
cursorSeen = true;
}
if (toCopy > 0) {
memcpy(destLine->cells + destLine->length,
sourceLine->cells + sourceX, toCopy * sizeof(TerminalCell));
destLine->length += toCopy;
}
destLine->attributes = sourceLine->attributes;
bool nextDestLine = false;
if (toCopy == sourceLeft) {
if (!sourceLine->softBreak)
nextDestLine = true;
sourceIndex++;
sourceX = 0;
sourceLine = _HistoryLineAt(sourceIndex - historySize,
lineBuffer);
} else {
destLine->softBreak = true;
nextDestLine = true;
sourceX += toCopy;
}
if (nextDestLine) {
destIndex = (destIndex + 1) % height;
destTotalLines++;
newDestLine = true;
if (cursorSeen && destTotalLines >= maxDestTotalLines)
break;
}
}
// If the last source line had a soft break, the last dest line
// won't have been counted yet.
if (!newDestLine) {
destIndex = (destIndex + 1) % height;
destTotalLines++;
}
//debug_printf(" total lines: %ld -> %ld\n", totalLines, destTotalLines);
if (destTotalLines - destScreenOffset > height)
destScreenOffset = destTotalLines - height;
cursor.y -= destScreenOffset;
// When there are less lines (starting with the screen offset) than
// there's room in the screen, clear the remaining screen lines.
for (int32 i = destTotalLines; i < destScreenOffset + height; i++) {
// Move the line we're going to clear to the history, if that's a
// line we've written earlier.
TerminalLine* line = screen[i % height];
if (history != NULL && i >= height)
history->AddLine(line);
line->Clear(fAttributes, width);
}
// Update the values
_FreeLines(fScreen, fHeight);
delete fHistory;
fScreen = screen;
fHistory = history;
if (fWidth != width) {
status_t error = _ResetTabStops(width);
if (error != B_OK)
return error;
}
//debug_printf(" cursor: (%ld, %ld) -> (%ld, %ld)\n", fCursor.x, fCursor.y,
//cursor.x, cursor.y);
fCursor.x = cursor.x;
fCursor.y = cursor.y;
fSoftWrappedCursor = false;
//debug_printf(" screen offset: %ld -> %ld\n", fScreenOffset, destScreenOffset % height);
fScreenOffset = destScreenOffset % height;
//debug_printf(" height %ld -> %ld\n", fHeight, height);
//debug_printf(" width %ld -> %ld\n", fWidth, width);
fHeight = height;
fWidth = width;
fScrollTop = 0;
fScrollBottom = fHeight - 1;
fOriginMode = fSavedOriginMode = false;
return B_OK;
}