1 /***************************************************************************
2 * Copyright (C) 2010 by Simon Andreas Eugster (simon.eu@gmail.com) *
3 * This file is part of kdenlive. See www.kdenlive.org. *
5 * This program is free software; you can redistribute it and/or modify *
6 * it under the terms of the GNU General Public License as published by *
7 * the Free Software Foundation; either version 2 of the License, or *
8 * (at your option) any later version. *
9 ***************************************************************************/
12 This abstract widget is a proof that abstract things sometimes *are* useful.
14 The widget expects three layers which
15 * Will be painted on top of each other on each update
16 * Are rendered in a separate thread so that the UI is not blocked
17 * Are rendered only if necessary (e.g., if a layer does not depend
18 on input images, it will not be re-rendered for incoming frames)
20 The layer order is as follows:
25 ---------------------------
30 ---------------------------
35 ---------------------------
37 Colors of Scope Widgets are defined in here (and thus don't need to be
38 re-defined in the implementation of the widget's .ui file).
40 The custom context menu already contains entries, like for enabling auto-
41 refresh. It can certainly be extended in the implementation of the widget.
43 Note: Widgets deriving from this class should connect slotActiveMonitorChanged
44 to the appropriate signal.
46 If you intend to write an own widget inheriting from this one, please read
47 the comments on the unimplemented methods carefully. They are not only here
48 for optical amusement, but also contain important information.
51 #ifndef ABSTRACTSCOPEWIDGET_H
52 #define ABSTRACTSCOPEWIDGET_H
62 class AbstractScopeWidget : public QWidget
67 AbstractScopeWidget(Monitor *projMonitor, Monitor *clipMonitor, QWidget *parent = 0);
68 virtual ~AbstractScopeWidget(); // Must be virtual because of inheritance, to avoid memory leaks
69 QPalette m_scopePalette;
71 /** Initializes widget settings (reads configuration).
72 Has to be called in the implementing object. */
75 ///// Unimplemented /////
77 virtual QString widgetName() const = 0;
80 static const QPen penThick;
81 static const QPen penThin;
82 static const QPen penLight;
83 static const QPen penDark;
88 Monitor *m_projMonitor;
89 Monitor *m_clipMonitor;
90 Render *m_activeRender;
93 /** The context menu. Feel free to add new entries in your implementation. */
96 /** Enables auto refreshing of the scope.
97 This is when a new frame is shown on the active monitor.
98 Resize events always force a recalculation. */
99 QAction *m_aAutoRefresh;
101 /** Realtime rendering. Should be disabled if it is not supported.
102 Use the accelerationFactor variable passed to the render functions as a hint of
103 how many times faster the scope should be calculated. */
104 QAction *m_aRealtime;
107 /** Offset from the widget's borders */
110 /** The rect on the widget we're painting in.
111 Can be used by the implementing widget, e.g. in the render methods.
112 Is updated when necessary (size changes). */
115 /** Images storing the calculated layers. Will be used on repaint events. */
118 QImage m_imgBackground;
120 /** The acceleration factors can be accessed also by other renderer tasks,
121 e.g. to display the scope's acceleration factor in the HUD renderer. */
122 int m_accelFactorHUD;
123 int m_accelFactorScope;
124 int m_accelFactorBackground;
126 /** Reads the widget's configuration.
127 Can be extended in the implementing subclass (make sure to run readConfig as well). */
128 virtual void readConfig();
129 /** Writes the widget configuration.
130 Implementing widgets have to implement an own method and run it in their destructor. */
132 /** Identifier for the widget's configuration. */
133 QString configName();
136 ///// Unimplemented Methods /////
138 /** Where on the widget we can paint in.
139 May also update other variables that depend on the widget's size. */
140 virtual QRect scopeRect() = 0;
142 /** @brief HUD renderer. Must emit signalHUDRenderingFinished(). @see renderScope */
143 virtual QImage renderHUD(uint accelerationFactor) = 0;
144 /** @brief Scope renderer. Must emit signalScopeRenderingFinished()
145 when calculation has finished, to allow multi-threading.
146 accelerationFactor hints how much faster than usual the calculation should be accomplished, if possible. */
147 virtual QImage renderScope(uint accelerationFactor, QImage) = 0;
148 /** @brief Background renderer. Must emit signalBackgroundRenderingFinished(). @see renderScope */
149 virtual QImage renderBackground(uint accelerationFactor) = 0;
151 /** Must return true if the HUD layer depends on the input monitor.
152 If it does not, then it does not need to be re-calculated when
153 a new frame from the monitor is incoming. */
154 virtual bool isHUDDependingOnInput() const = 0;
155 /** @see isHUDDependingOnInput() */
156 virtual bool isScopeDependingOnInput() const = 0;
157 /** @see isHUDDependingOnInput() */
158 virtual bool isBackgroundDependingOnInput() const = 0;
160 ///// Can be reimplemented /////
161 /** Calculates the acceleration factor to be used by the render thread.
162 This method can be refined in the subclass if required. */
163 virtual uint calculateAccelFactorHUD(uint oldMseconds, uint oldFactor);
164 virtual uint calculateAccelFactorScope(uint oldMseconds, uint oldFactor);
165 virtual uint calculateAccelFactorBackground(uint oldMseconds, uint oldFactor);
167 ///// Reimplemented /////
169 void mouseReleaseEvent(QMouseEvent *);
170 void paintEvent(QPaintEvent *);
171 void resizeEvent(QResizeEvent *);
172 void showEvent(QShowEvent *); // Called when the widget is activated via the Menu entry
173 // void raise(); // Called only when manually calling the event -> useless
176 /** Forces an update of all layers. */
177 void forceUpdate(bool doUpdate = true);
178 void forceUpdateHUD();
179 void forceUpdateScope();
180 void forceUpdateBackground();
181 void slotAutoRefreshToggled(bool);
184 /** mseconds represent the time taken for the calculation,
185 accelerationFactor is the acceleration factor that has been used. */
186 void signalHUDRenderingFinished(uint mseconds, uint accelerationFactor);
187 void signalScopeRenderingFinished(uint mseconds, uint accelerationFactor);
188 void signalBackgroundRenderingFinished(uint mseconds, uint accelerationFactor);
192 /** Counts the number of frames that have been rendered in the active monitor.
193 The frame number will be reset when the calculation starts for the current frame. */
194 QAtomicInt m_newHUDFrames;
195 QAtomicInt m_newScopeFrames;
196 QAtomicInt m_newBackgroundFrames;
198 /** Counts the number of updates that, unlike new frames, force a recalculation
199 of the scope, like for example a resize event. */
200 QAtomicInt m_newHUDUpdates;
201 QAtomicInt m_newScopeUpdates;
202 QAtomicInt m_newBackgroundUpdates;
204 /** The semaphores ensure that the QFutures for the HUD/Scope/Background threads cannot
205 be assigned a new thread while it is still running. (Could cause deadlocks and other
206 nasty things known from parallelism. */
207 QSemaphore m_semaphoreHUD;
208 QSemaphore m_semaphoreScope;
209 QSemaphore m_semaphoreBackground;
211 QFuture<QImage> m_threadHUD;
212 QFuture<QImage> m_threadScope;
213 QFuture<QImage> m_threadBackground;
217 QString m_widgetName;
219 bool initialDimensionUpdateDone;
220 void prodHUDThread();
221 void prodScopeThread();
222 void prodBackgroundThread();
226 /** @brief Must be called when the active monitor has shown a new frame.
227 This slot must be connected in the implementing class, it is *not*
228 done in this abstract class. */
229 void slotActiveMonitorChanged(bool isClipMonitor);
230 void customContextMenuRequested(const QPoint &pos);
231 /** To be called when a new frame has been received.
232 The scope then decides whether and when it wants to recalculate the scope, depending
233 on whether it is currently visible and whether a calculation thread is already running. */
234 void slotRenderZoneUpdated();
235 void slotRenderZoneUpdated(QImage);
236 /** The following slots are called when rendering of a component has finished. They e.g. update
237 the widget and decide whether to immediately restart the calculation thread. */
238 void slotHUDRenderingFinished(uint mseconds, uint accelerationFactor);
239 void slotScopeRenderingFinished(uint mseconds, uint accelerationFactor);
240 void slotBackgroundRenderingFinished(uint mseconds, uint accelerationFactor);
242 /** Resets the acceleration factors to 1 when realtime rendering is disabled. */
243 void slotResetRealtimeFactor(bool realtimeChecked);
247 #endif // ABSTRACTSCOPEWIDGET_H