[1f4adec] | 1 | /* |
---|
| 2 | |
---|
| 3 | Copyright 2013-2015 Adam Reichold |
---|
| 4 | |
---|
| 5 | This file is part of qpdfview. |
---|
| 6 | |
---|
| 7 | qpdfview is free software: you can redistribute it and/or modify |
---|
| 8 | it under the terms of the GNU General Public License as published by |
---|
| 9 | the Free Software Foundation, either version 2 of the License, or |
---|
| 10 | (at your option) any later version. |
---|
| 11 | |
---|
| 12 | qpdfview is distributed in the hope that it will be useful, |
---|
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
---|
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
---|
| 15 | GNU General Public License for more details. |
---|
| 16 | |
---|
| 17 | You should have received a copy of the GNU General Public License |
---|
| 18 | along with qpdfview. If not, see <http://www.gnu.org/licenses/>. |
---|
| 19 | |
---|
| 20 | */ |
---|
| 21 | |
---|
| 22 | #ifndef RENDERTASK_H |
---|
| 23 | #define RENDERTASK_H |
---|
| 24 | |
---|
| 25 | #include <QImage> |
---|
| 26 | #include <QMutex> |
---|
| 27 | #include <QRunnable> |
---|
| 28 | #include <QWaitCondition> |
---|
| 29 | |
---|
| 30 | #include "renderparam.h" |
---|
| 31 | |
---|
| 32 | namespace qpdfview |
---|
| 33 | { |
---|
| 34 | |
---|
| 35 | namespace Model |
---|
| 36 | { |
---|
| 37 | class Page; |
---|
| 38 | } |
---|
| 39 | |
---|
| 40 | class Settings; |
---|
| 41 | |
---|
| 42 | class RenderTask : public QObject, QRunnable |
---|
| 43 | { |
---|
| 44 | Q_OBJECT |
---|
| 45 | |
---|
| 46 | public: |
---|
| 47 | explicit RenderTask(Model::Page* page, QObject* parent = 0); |
---|
| 48 | |
---|
| 49 | void wait(); |
---|
| 50 | |
---|
| 51 | bool isRunning() const; |
---|
| 52 | |
---|
| 53 | bool wasCanceled() const { return loadCancellation() != NotCanceled; } |
---|
| 54 | bool wasCanceledNormally() const { return loadCancellation() == CanceledNormally; } |
---|
| 55 | bool wasCanceledForcibly() const { return loadCancellation() == CanceledForcibly; } |
---|
| 56 | |
---|
| 57 | void run(); |
---|
| 58 | |
---|
| 59 | signals: |
---|
| 60 | void finished(); |
---|
| 61 | |
---|
| 62 | void imageReady(const RenderParam& renderParam, |
---|
| 63 | const QRect& rect, bool prefetch, |
---|
| 64 | const QImage& image, const QRectF& cropRect); |
---|
| 65 | |
---|
| 66 | public slots: |
---|
| 67 | void start(const RenderParam& renderParam, |
---|
| 68 | const QRect& rect, bool prefetch); |
---|
| 69 | |
---|
| 70 | void cancel(bool force = false) { setCancellation(force); } |
---|
| 71 | |
---|
| 72 | private: |
---|
| 73 | Q_DISABLE_COPY(RenderTask) |
---|
| 74 | |
---|
| 75 | static Settings* s_settings; |
---|
| 76 | |
---|
| 77 | mutable QMutex m_mutex; |
---|
| 78 | QWaitCondition m_waitCondition; |
---|
| 79 | |
---|
| 80 | bool m_isRunning; |
---|
| 81 | QAtomicInt m_wasCanceled; |
---|
| 82 | |
---|
| 83 | enum |
---|
| 84 | { |
---|
| 85 | NotCanceled = 0, |
---|
| 86 | CanceledNormally = 1, |
---|
| 87 | CanceledForcibly = 2 |
---|
| 88 | }; |
---|
| 89 | |
---|
| 90 | void setCancellation(bool force); |
---|
| 91 | void resetCancellation(); |
---|
| 92 | bool testCancellation(); |
---|
| 93 | int loadCancellation() const; |
---|
| 94 | |
---|
| 95 | void finish(); |
---|
| 96 | |
---|
| 97 | |
---|
| 98 | Model::Page* m_page; |
---|
| 99 | |
---|
| 100 | static RenderParam s_defaultRenderParam; |
---|
| 101 | RenderParam m_renderParam; |
---|
| 102 | |
---|
| 103 | QRect m_rect; |
---|
| 104 | bool m_prefetch; |
---|
| 105 | |
---|
| 106 | }; |
---|
| 107 | |
---|
| 108 | #if QT_VERSION > QT_VERSION_CHECK(5,0,0) |
---|
| 109 | |
---|
| 110 | inline void RenderTask::setCancellation(bool force) |
---|
| 111 | { |
---|
| 112 | m_wasCanceled.storeRelease(force ? CanceledForcibly : CanceledNormally); |
---|
| 113 | } |
---|
| 114 | |
---|
| 115 | inline void RenderTask::resetCancellation() |
---|
| 116 | { |
---|
| 117 | m_wasCanceled.storeRelease(NotCanceled); |
---|
| 118 | } |
---|
| 119 | |
---|
| 120 | inline bool RenderTask::testCancellation() |
---|
| 121 | { |
---|
| 122 | return m_prefetch ? |
---|
| 123 | m_wasCanceled.load() == CanceledForcibly : |
---|
| 124 | m_wasCanceled.load() != NotCanceled; |
---|
| 125 | } |
---|
| 126 | |
---|
| 127 | inline int RenderTask::loadCancellation() const |
---|
| 128 | { |
---|
| 129 | return m_wasCanceled.load(); |
---|
| 130 | } |
---|
| 131 | |
---|
| 132 | #else |
---|
| 133 | |
---|
| 134 | inline void RenderTask::setCancellation(bool force) |
---|
| 135 | { |
---|
| 136 | m_wasCanceled.fetchAndStoreRelease(force ? CanceledForcibly : CanceledNormally); |
---|
| 137 | } |
---|
| 138 | |
---|
| 139 | inline void RenderTask::resetCancellation() |
---|
| 140 | { |
---|
| 141 | m_wasCanceled.fetchAndStoreRelease(NotCanceled); |
---|
| 142 | } |
---|
| 143 | |
---|
| 144 | inline bool RenderTask::testCancellation() |
---|
| 145 | { |
---|
| 146 | return m_prefetch ? |
---|
| 147 | m_wasCanceled.testAndSetRelaxed(CanceledForcibly, CanceledForcibly) : |
---|
| 148 | !m_wasCanceled.testAndSetRelaxed(NotCanceled, NotCanceled); |
---|
| 149 | } |
---|
| 150 | |
---|
| 151 | inline int RenderTask::loadCancellation() const |
---|
| 152 | { |
---|
| 153 | return m_wasCanceled; |
---|
| 154 | } |
---|
| 155 | |
---|
| 156 | #endif // QT_VERSION |
---|
| 157 | |
---|
| 158 | } // qpdfview |
---|
| 159 | |
---|
| 160 | #endif // RENDERTASK_H |
---|