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 If you intend to write an own widget inheriting from this one, please read
44 the comments on the unimplemented methods carefully. They are not only here
45 for optical amusement, but also contain important information.
48 #ifndef ABSTRACTSCOPEWIDGET_H
49 #define ABSTRACTSCOPEWIDGET_H
56 class AbstractScopeWidget : public QWidget
61 /** trackMouse enables mouse tracking; The variables m_mousePos and m_mouseWithinWidget will be set
62 if mouse tracking is enabled. See also signalMousePositionChanged(). */
63 AbstractScopeWidget(bool trackMouse = false, QWidget *parent = 0);
64 virtual ~AbstractScopeWidget(); // Must be virtual because of inheritance, to avoid memory leaks
67 enum RescaleDirection { North, Northeast, East, Southeast };
70 QPalette m_scopePalette;
72 /** Initializes widget settings (reads configuration).
73 Has to be called in the implementing object. */
76 /** Tell whether this scope has auto-refresh enabled. Required for determining whether
77 new data (e.g. an image frame) has to be delivered to this widget. */
78 bool autoRefreshEnabled();
80 ///// Unimplemented /////
82 virtual QString widgetName() const = 0;
85 static const QPen penThick;
86 static const QPen penThin;
87 static const QPen penLight;
88 static const QPen penLightDots;
89 static const QPen penLighter;
90 static const QPen penDark;
91 static const QPen penDarkDots;
93 static const QString directions[]; // Mainly for debug output
98 /** The context menu. Feel free to add new entries in your implementation. */
101 /** Enables auto refreshing of the scope.
102 This is when fresh data is incoming.
103 Resize events always force a recalculation. */
104 QAction *m_aAutoRefresh;
106 /** Realtime rendering. Should be disabled if it is not supported.
107 Use the accelerationFactor variable passed to the render functions as a hint of
108 how many times faster the scope should be calculated. */
109 QAction *m_aRealtime;
111 /** The mouse position; Updated when the mouse enters the widget
112 AND mouse tracking has been enabled. */
114 /** Knows whether the mouse currently lies within the widget or not.
115 Can e.g. be used for drawing a HUD only when the mouse is in the widget. */
116 bool m_mouseWithinWidget;
118 /** Offset from the widget's borders */
121 /** The rect on the widget we're painting in.
122 Can be used by the implementing widget, e.g. in the render methods.
123 Is updated when necessary (size changes). */
126 /** Images storing the calculated layers. Will be used on repaint events. */
129 QImage m_imgBackground;
131 /** The acceleration factors can be accessed also by other renderer tasks,
132 e.g. to display the scope's acceleration factor in the HUD renderer. */
133 int m_accelFactorHUD;
134 int m_accelFactorScope;
135 int m_accelFactorBackground;
137 /** Reads the widget's configuration.
138 Can be extended in the implementing subclass (make sure to run readConfig as well). */
139 virtual void readConfig();
140 /** Writes the widget configuration.
141 Implementing widgets have to implement an own method and run it in their destructor. */
143 /** Identifier for the widget's configuration. */
144 QString configName();
147 ///// Unimplemented Methods /////
149 /** Where on the widget we can paint in.
150 May also update other variables, like m_scopeRect or custom ones,
151 that have to change together with the widget's size. */
152 virtual QRect scopeRect() = 0;
154 /** @brief HUD renderer. Must emit signalHUDRenderingFinished(). @see renderScope */
155 virtual QImage renderHUD(uint accelerationFactor) = 0;
156 /** @brief Scope renderer. Must emit signalScopeRenderingFinished()
157 when calculation has finished, to allow multi-threading.
158 accelerationFactor hints how much faster than usual the calculation should be accomplished, if possible. */
159 virtual QImage renderScope(uint accelerationFactor) = 0;
160 /** @brief Background renderer. Must emit signalBackgroundRenderingFinished(). @see renderScope */
161 virtual QImage renderBackground(uint accelerationFactor) = 0;
163 /** Must return true if the HUD layer depends on the input data.
164 If it does not, then it does not need to be re-calculated when
165 fresh data is incoming. */
166 virtual bool isHUDDependingOnInput() const = 0;
167 /** @see isHUDDependingOnInput() */
168 virtual bool isScopeDependingOnInput() const = 0;
169 /** @see isHUDDependingOnInput() */
170 virtual bool isBackgroundDependingOnInput() const = 0;
172 ///// Can be reimplemented /////
173 /** Calculates the acceleration factor to be used by the render thread.
174 This method can be refined in the subclass if required. */
175 virtual uint calculateAccelFactorHUD(uint oldMseconds, uint oldFactor);
176 virtual uint calculateAccelFactorScope(uint oldMseconds, uint oldFactor);
177 virtual uint calculateAccelFactorBackground(uint oldMseconds, uint oldFactor);
179 /** The Abstract Scope will try to detect the movement direction when dragging on the widget with the mouse.
180 As soon as the direction is determined it will execute this method. Can be used e.g. for re-scaling content.
181 This is just a dummy function, re-implement to add functionality. */
182 virtual void handleMouseDrag(const QPoint movement, const RescaleDirection rescaleDirection, const Qt::KeyboardModifiers rescaleModifiers);
184 ///// Reimplemented /////
186 void mouseMoveEvent(QMouseEvent *event);
187 void mousePressEvent(QMouseEvent *event);
188 void mouseReleaseEvent(QMouseEvent *event);
189 void leaveEvent(QEvent *);
190 void paintEvent(QPaintEvent *);
191 void resizeEvent(QResizeEvent *);
192 void showEvent(QShowEvent *); // Called when the widget is activated via the Menu entry
193 // void raise(); // Called only when manually calling the event -> useless
197 /** Forces an update of all layers. */
198 void forceUpdate(bool doUpdate = true);
199 void forceUpdateHUD();
200 void forceUpdateScope();
201 void forceUpdateBackground();
202 void slotAutoRefreshToggled(bool);
205 /** mseconds represent the time taken for the calculation,
206 accelerationFactor is the acceleration factor that has been used for this calculation. */
207 void signalHUDRenderingFinished(uint mseconds, uint accelerationFactor);
208 void signalScopeRenderingFinished(uint mseconds, uint accelerationFactor);
209 void signalBackgroundRenderingFinished(uint mseconds, uint accelerationFactor);
211 /** For the mouse position itself see m_mousePos.
212 To check whether the mouse has leaved the widget, see m_mouseWithinWidget.
213 This signal is typically connected to forceUpdateHUD(). */
214 void signalMousePositionChanged();
216 /** Do we need the renderer to send its frames to us? */
217 void requestAutoRefresh(bool);
221 /** Counts the number of data frames that have been rendered in the active monitor.
222 The frame number will be reset when the calculation starts for the current data set. */
223 QAtomicInt m_newHUDFrames;
224 QAtomicInt m_newScopeFrames;
225 QAtomicInt m_newBackgroundFrames;
227 /** Counts the number of updates that, unlike new frames, force a recalculation
228 of the scope, like for example a resize event. */
229 QAtomicInt m_newHUDUpdates;
230 QAtomicInt m_newScopeUpdates;
231 QAtomicInt m_newBackgroundUpdates;
233 /** The semaphores ensure that the QFutures for the HUD/Scope/Background threads cannot
234 be assigned a new thread while it is still running. (Could cause deadlocks and other
235 nasty things known from parallelism.) */
236 QSemaphore m_semaphoreHUD;
237 QSemaphore m_semaphoreScope;
238 QSemaphore m_semaphoreBackground;
240 QFuture<QImage> m_threadHUD;
241 QFuture<QImage> m_threadScope;
242 QFuture<QImage> m_threadBackground;
244 bool initialDimensionUpdateDone;
245 bool m_requestForcedUpdate;
249 QString m_widgetName;
251 void prodHUDThread();
252 void prodScopeThread();
253 void prodBackgroundThread();
255 ///// Movement detection /////
256 const int m_rescaleMinDist;
257 const float m_rescaleVerticalThreshold;
259 bool m_rescaleActive;
260 bool m_rescalePropertiesLocked;
261 bool m_rescaleFirstRescaleDone;
262 short m_rescaleScale;
263 Qt::KeyboardModifiers m_rescaleModifiers;
264 RescaleDirection m_rescaleDirection;
265 QPoint m_rescaleStartPoint;
269 void customContextMenuRequested(const QPoint &pos);
270 /** To be called when a new frame has been received.
271 The scope then decides whether and when it wants to recalculate the scope, depending
272 on whether it is currently visible and whether a calculation thread is already running. */
273 void slotRenderZoneUpdated();
274 /** The following slots are called when rendering of a component has finished. They e.g. update
275 the widget and decide whether to immediately restart the calculation thread. */
276 void slotHUDRenderingFinished(uint mseconds, uint accelerationFactor);
277 void slotScopeRenderingFinished(uint mseconds, uint accelerationFactor);
278 void slotBackgroundRenderingFinished(uint mseconds, uint accelerationFactor);
280 /** Resets the acceleration factors to 1 when realtime rendering is disabled. */
281 void slotResetRealtimeFactor(bool realtimeChecked);
285 #endif // ABSTRACTSCOPEWIDGET_H