Add fast forward option

src/qt/languages/86box.pot

@@ -3002,3 +3002,6 @@ msgstr ""
 
 msgid "&Allow recompilation"
 msgstr ""
+
+msgid "&Fast forward"
+msgstr ""

src/qt/qt_main.cpp

@@ -100,6 +100,7 @@ extern int  qt_nvr_save(void);
 extern void exit_pause(void);
 
 bool cpu_thread_running = false;
+bool fast_forward = false;
 }
 
 #include <locale.h>
@@ -452,7 +453,7 @@ main_thread_fn()
 #endif
             drawits += static_cast<int>(new_time - old_time);
         old_time = new_time;
-        if (drawits > 0 && !dopause) {
+        if ((drawits > 0 || fast_forward) && !dopause) {
             /* Yes, so run frames now. */
             do {
 #ifdef USE_INSTRUMENT
@@ -478,8 +479,9 @@ main_thread_fn()
                 }
                 
                 drawits -= force_10ms ? 10 : 1;
-                if (drawits > 50)
+                if (drawits > 50 || fast_forward)
                     drawits = 0;
+
             } while (drawits > 0);
         } else {
             /* Just so we dont overload the host OS. */

src/qt/qt_mainwindow.cpp

@@ -65,6 +65,7 @@ extern int qt_nvr_save(void);
 #endif
 
 extern bool cpu_thread_running;
+extern bool fast_forward;
 };
 
 #include <QGuiApplication>
@@ -2135,6 +2136,12 @@ MainWindow::on_actionUpdate_mouse_every_CPU_frame_triggered()
     config_save();
 }
 
+void
+MainWindow::on_action_Fast_forward_triggered()
+{
+    fast_forward ^= 1;
+}
+
 void
 MainWindow::on_actionRemember_size_and_position_triggered()
 {

src/qt/qt_mainwindow.hpp

@@ -141,6 +141,7 @@ private slots:
     void on_actionPreferences_triggered();
     void on_actionEnable_Discord_integration_triggered(bool checked);
     void on_actionRenderer_options_triggered();
+    void on_action_Fast_forward_triggered();
 
     void refreshMediaMenu();
     void showMessage_(int flags, const QString &header, const QString &message, bool richText, std::atomic_bool *done = nullptr);

src/qt/qt_mainwindow.ui

@@ -78,6 +78,8 @@
     <addaction name="actionAuto_pause"/>
     <addaction name="actionPause"/>
     <addaction name="separator"/>
+    <addaction name="action_Fast_forward"/>
+    <addaction name="separator"/>
     <addaction name="actionForce_interpretation"/>
     <addaction name="separator"/>
     <addaction name="actionHard_Reset"/>
@@ -311,6 +313,8 @@
    <addaction name="separator"/>
    <addaction name="actionTake_screenshot"/>
    <addaction name="actionCopy_screenshot"/>
+   <addaction name="separator"/>
+   <addaction name="action_Fast_forward"/>
   </widget>
   <action name="actionForce_interpretation">
    <property name="icon">
@@ -1069,6 +1073,18 @@
     <string>&amp;8x</string>
    </property>
   </action>
+  <action name="action_Fast_forward">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
+   <property name="icon">
+    <iconset resource="../qt_resources.qrc">
+     <normaloff>:/settings/qt/icons/fast_forward.ico</normaloff>:/settings/qt/icons/fast_forward.ico</iconset>
+   </property>
+   <property name="text">
+    <string>&amp;Fast forward</string>
+   </property>
+  </action>
  </widget>
  <customwidgets>
   <customwidget>