* Copyright 2008, Ingo Weinhold, ingo_weinhold@gmx.de.
* Distributed under the terms of the MIT License.
*/
#ifndef HISTORY_BUFFER_H
#define HISTORY_BUFFER_H
#include <SupportDefs.h>
#include "TerminalLine.h"
struct HistoryLine;
struct TerminalLine;
class HistoryBuffer {
public:
HistoryBuffer();
~HistoryBuffer();
status_t Init(int32 width, int32 capacity);
void Clear();
int32 Width() const { return fWidth; }
int32 Capacity() const { return fCapacity; }
int32 Size() const { return fSize; }
inline HistoryLine* LineAt(int32 index) const;
TerminalLine* GetTerminalLineAt(int32 index,
TerminalLine* buffer) const;
void AddLine(const TerminalLine* line);
void AddEmptyLines(int32 count);
void DropLines(int32 count);
private:
HistoryLine* _AllocateLine(int32 attributesRuns,
int32 byteLength);
inline HistoryLine* _LineAt(int32 index) const;
private:
HistoryLine* fLines;
int32 fWidth;
int32 fCapacity;
int32 fNextLine;
int32 fSize;
uint8* fBuffer;
int32 fBufferSize;
int32 fBufferAllocationOffset;
};
inline HistoryLine*
HistoryBuffer::_LineAt(int32 index) const
{
return &fLines[(fCapacity + fNextLine - index - 1) % fCapacity];
}
inline HistoryLine*
HistoryBuffer::LineAt(int32 index) const
{
return index >= 0 && index < fSize ? _LineAt(index) : NULL;
}
#endif
