1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
/* ============================================================
 *
 * This file is a part of digiKam project
 * https://www.digikam.org
 *
 * Date        : 2006-01-20
 * Description : image file IO threaded interface.
 *
 * SPDX-FileCopyrightText: 2005-2013 by Marcel Wiesweg <marcel dot wiesweg at gmx dot de>
 * SPDX-FileCopyrightText: 2005-2025 by Gilles Caulier <caulier dot gilles at gmail dot com>
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 *
 * ============================================================ */

#pragma once

// Qt includes

#include <QList>
#include <QEvent>

// Local includes

#include "dimg.h"
#include "dimgloaderobserver.h"
#include "loadingdescription.h"
#include "loadingcache.h"

namespace Digikam
{

class LoadSaveThread;

class LoadSaveTask
{
public:

    enum TaskType
    {
        TaskTypeLoading,
        TaskTypeSaving
    };

public:

    explicit LoadSaveTask(LoadSaveThread* const thread);
    virtual ~LoadSaveTask() = default;

public:

    virtual void execute()                    = 0;
    virtual TaskType type()                   = 0;

    virtual void progressInfo(float progress) = 0;
    virtual bool continueQuery()              = 0;

protected:

    LoadSaveThread* m_thread = nullptr;

private:

    // Disable
    LoadSaveTask(const LoadSaveTask&)            = delete;
    LoadSaveTask& operator=(const LoadSaveTask&) = delete;
};

//---------------------------------------------------------------------------------------------------

class LoadingTask : public LoadSaveTask,
                    public DImgLoaderObserver
{
public:

    enum LoadingTaskStatus
    {
        LoadingTaskStatusLoading,
        LoadingTaskStatusPreloading,
        LoadingTaskStatusStopping
    };

public:

    explicit LoadingTask(LoadSaveThread* const thread,
                         const LoadingDescription& description,
                         LoadingTaskStatus loadingTaskStatus = LoadingTaskStatusLoading);
    ~LoadingTask() override = default;

    LoadingTaskStatus status()                     const;
    QString filePath()                             const;<--- Function 'filePath()' should return member 'filePath' by const reference.

    const LoadingDescription& loadingDescription() const;

    // LoadSaveTask

    void execute()                    override;
    TaskType type()                   override;

    // DImgLoaderObserver

    void progressInfo(float progress) override;
    bool continueQuery()              override;

    void setStatus(LoadingTaskStatus status);

protected:

    LoadingDescription         m_loadingDescription;
    volatile LoadingTaskStatus m_loadingTaskStatus = LoadingTaskStatusLoading;

private:

    // Disable
    LoadingTask(const LoadingTask&)            = delete;
    LoadingTask& operator=(const LoadingTask&) = delete;
};

//---------------------------------------------------------------------------------------------------

class SharedLoadingTask : public LoadingTask,
                          public LoadingProcess,
                          public LoadingProcessListener
{
public:

    explicit SharedLoadingTask(LoadSaveThread* const thread,
                               const LoadingDescription& description,
                               LoadSaveThread::AccessMode mode = LoadSaveThread::AccessModeReadWrite,
                               LoadingTaskStatus loadingTaskStatus = LoadingTaskStatusLoading);

    void execute()                                                      override;
    void progressInfo(float progress)                                   override;

    bool needsPostProcessing()              const;
    virtual void postProcess();

    // LoadingProcess

    bool completed()                        const                       override;
    QString cacheKey()                      const                       override;
    void addListener(LoadingProcessListener* const listener)            override;
    void removeListener(LoadingProcessListener* const listener)         override;
    void notifyNewLoadingProcess(LoadingProcess* const process,
                                 const LoadingDescription& description) override;

    // LoadingProcessListener

    bool querySendNotifyEvent()             const                       override;
    void setResult(const LoadingDescription& loadingDescription,
                   const DImg& img)                                     override;
    LoadSaveNotifier* loadSaveNotifier()    const                       override;
    LoadSaveThread::AccessMode accessMode() const                       override;

    DImg img()                              const;

protected:

    volatile bool                  m_completed  = false;
    LoadSaveThread::AccessMode     m_accessMode = LoadSaveThread::AccessModeReadWrite;
    QList<LoadingProcessListener*> m_listeners;
    DImg                           m_img;

private:

    // Disable
    SharedLoadingTask(const SharedLoadingTask&)            = delete;
    SharedLoadingTask& operator=(const SharedLoadingTask&) = delete;
};

//---------------------------------------------------------------------------------------------------

class SavingTask : public LoadSaveTask,
                   public DImgLoaderObserver
{
public:

    enum SavingTaskStatus
    {
        SavingTaskStatusSaving,
        SavingTaskStatusStopping
    };

public:

    explicit SavingTask(LoadSaveThread* const thread,
                        const DImg& img,
                        const QString& filePath,
                        const QString& format);

    SavingTaskStatus status() const;
    QString filePath()        const;<--- Function 'filePath()' should return member 'm_filePath' by const reference.

public:

    void execute()                    override;
    TaskType type()                   override;

    void progressInfo(float progress) override;
    bool continueQuery()              override;

    void setStatus(SavingTaskStatus status);

private:

    QString                   m_filePath;
    QString                   m_format;
    DImg                      m_img;
    volatile SavingTaskStatus m_savingTaskStatus = SavingTaskStatusSaving;

private:

    // Disable
    SavingTask(const SavingTask&)            = delete;
    SavingTask& operator=(const SavingTask&) = delete;
};

} // namespace Digikam