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#ifndef _PYTHONQTMISC_H
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#define _PYTHONQTMISC_H
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/*
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*
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* Copyright (C) 2010 MeVis Medical Solutions AG All Rights Reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* Further, this software is distributed without any warranty that it is
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* free of the rightful claim of any third person regarding infringement
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* or the like. Any license provided herein, whether implied or
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* otherwise, applies only to this software file. Patent licenses, if
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* any, provided herein do not apply to combinations of this program with
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* other software, or any other product whatsoever.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Contact information: MeVis Medical Solutions AG, Universitaetsallee 29,
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* 28359 Bremen, Germany or:
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*
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* http://www.mevis.de
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*
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*/
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//----------------------------------------------------------------------------------
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/*!
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// \file PythonQtMisc.h
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// \author Florian Link
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// \author Last changed by $Author: florian $
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// \date 2006-05
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*/
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//----------------------------------------------------------------------------------
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#include <QList>
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#define PythonQtValueStorage_ADD_VALUE(store, type, value, ptr) \
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{ type* item = (type*)store.nextValuePtr(); \
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*item = value; \
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ptr = (void*)item; \
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}
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#define PythonQtValueStorage_ADD_VALUE_IF_NEEDED(alreadyAllocatedPtr,store, type, value, ptr) \
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{ \
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type* item = (type*)(alreadyAllocatedPtr?alreadyAllocatedPtr:store.nextValuePtr()); \
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*item = value; \
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ptr = (void*)item; \
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}
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//! stores a position in the PythonQtValueStorage
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class PythonQtValueStoragePosition {
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public:
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PythonQtValueStoragePosition() { chunkIdx = 0; chunkOffset = 0; }
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int chunkIdx;
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int chunkOffset;
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};
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//! a helper class that stores basic C++ value types in chunks
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template <typename T, int chunkEntries> class PythonQtValueStorage
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{
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public:
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PythonQtValueStorage() {
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_chunkIdx = 0;
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_chunkOffset = 0;
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_currentChunk = new T[chunkEntries];
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_chunks.append(_currentChunk);
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};
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//! clear all memory
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void clear() {
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T* chunk;
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Q_FOREACH(chunk, _chunks) {
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delete[]chunk;
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}
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_chunks.clear();
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}
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//! get the current position to be restored with setPos
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void getPos(PythonQtValueStoragePosition & pos) {
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pos.chunkIdx = _chunkIdx;
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pos.chunkOffset = _chunkOffset;
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}
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//! set the current position (without freeing memory, thus caching old entries for reuse)
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void setPos(const PythonQtValueStoragePosition& pos) {
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_chunkOffset = pos.chunkOffset;
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if (_chunkIdx != pos.chunkIdx) {
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_chunkIdx = pos.chunkIdx;
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_currentChunk = _chunks.at(_chunkIdx);
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}
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}
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//! add one default constructed value and return the pointer to it
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T* nextValuePtr() {
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if (_chunkOffset>=chunkEntries) {
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_chunkIdx++;
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if (_chunkIdx >= _chunks.size()) {
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T* newChunk = new T[chunkEntries];
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_chunks.append(newChunk);
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_currentChunk = newChunk;
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} else {
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_currentChunk = _chunks.at(_chunkIdx);
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}
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_chunkOffset = 0;
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}
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T* newEntry = _currentChunk + _chunkOffset;
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_chunkOffset++;
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return newEntry;
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};
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protected:
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QList<T*> _chunks;
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int _chunkIdx;
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int _chunkOffset;
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T* _currentChunk;
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};
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//! a helper class that stores basic C++ value types in chunks and clears the unused values on setPos() usage.
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template <typename T, int chunkEntries> class PythonQtValueStorageWithCleanup : public PythonQtValueStorage<T, chunkEntries>
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{
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public:
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void setPos(const PythonQtValueStoragePosition& pos) {
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if (_chunkIdx > pos.chunkIdx) {
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T* firstChunk = _chunks.at(pos.chunkIdx);
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// clear region in first chunk
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for (int i = pos.chunkOffset; i < chunkEntries; i++) {
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firstChunk[i] = T();
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}
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for (int chunk = pos.chunkIdx + 1; chunk < _chunkIdx; chunk++) {
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// clear the full chunks between the first and last chunk
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T* fullChunk = _chunks.at(chunk);
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for (int i = 0; i < chunkEntries; i++) {
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fullChunk[i] = T();
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}
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}
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// clear region in last chunk
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T* lastChunk = _chunks.at(_chunkIdx);
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for (int i = 0; i < _chunkOffset; i++) {
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lastChunk[i] = T();
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}
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} else if (_chunkIdx == pos.chunkIdx) {
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// clear the region in the last chunk only
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T* lastChunk = _chunks.at(_chunkIdx);
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for (int i = pos.chunkOffset; i<_chunkOffset; i++) {
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lastChunk[i] = T();
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}
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}
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PythonQtValueStorage<T, chunkEntries>::setPos(pos);
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}
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private:
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using PythonQtValueStorage<T, chunkEntries>::_chunks;
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using PythonQtValueStorage<T, chunkEntries>::_chunkIdx;
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using PythonQtValueStorage<T, chunkEntries>::_chunkOffset;
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using PythonQtValueStorage<T, chunkEntries>::_currentChunk;
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};
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#endif
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