1 /* 2 * Copyright (c) 2017 Dmitry Kazakov <dimula73@gmail.com> 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; either version 2 of the License, or 7 * (at your option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the Free Software 16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. 17 */ 18 19 #ifndef KISSHAREDQIMAGEPYRAMID_H 20 #define KISSHAREDQIMAGEPYRAMID_H 21 22 #include "kritabrush_export.h" 23 24 #include <QSharedPointer> 25 #include <QMutex> 26 #include <QAtomicPointer> 27 28 29 class KisQImagePyramid; 30 class KisBrush; 31 32 /** 33 * A special class for storing the shared brushes pyramid among different brushes, 34 * which can be used by different threads. All the calls to pyramid() are thread-safe. 35 * 36 * Please note, that one cannot alter the pyramid. If the brush alters the pyramid, 37 * it should just detach from this object and create a new, unshared one. 38 */ 39 40 class BRUSH_EXPORT KisSharedQImagePyramid 41 { 42 public: 43 KisSharedQImagePyramid(); 44 ~KisSharedQImagePyramid(); 45 46 public: 47 48 // lazy create and return the pyramid 49 const KisQImagePyramid* pyramid(const KisBrush *brush) const; 50 51 // return true if the pyramid is already prepared 52 bool isNull() const; 53 54 private: 55 mutable QMutex m_mutex; 56 57 mutable QSharedPointer<const KisQImagePyramid> m_pyramid; 58 mutable QAtomicPointer<const KisQImagePyramid> m_cachedPyramidPointer; 59 }; 60 61 #endif // KISSHAREDQIMAGEPYRAMID_H 62