Add configurable proxy settings and a menu entry

- Extend ProxyManager::ProxyParams with crf and preset, and update
  ProxyTask/ProxyParamsEqual to use them.
- Add global config keys ProxyWidth, ProxyHeight, ProxyCRF, ProxyPreset.
- Add a Proxy Settings group to Preferences -> Disk with width/height/CRF/preset
  controls.
- Read proxy settings from config when generating proxies from the timeline.
- Add Tools -> Proxy Settings... menu entry that opens Preferences on the Disk tab.
- Add ConfigDialogBase::SetCurrentTab() so PreferencesDialog can start on a
  specific tab.

app/dialog/configbase/configdialogbase.cpp

@@ -91,4 +91,11 @@ void ConfigDialogBase::AddTab(ConfigDialogBaseTab *tab, const QString &title)
 	tabs_.append(tab);
 }
 
+void ConfigDialogBase::SetCurrentTab(int index)
+{
+	if (index >= 0 && index < list_widget_->count()) {
+		list_widget_->setCurrentRow(index);
+	}
+}
+
 }

app/dialog/configbase/configdialogbase.h

@@ -36,6 +36,8 @@ class ConfigDialogBase : public QDialog {
 public:
 	ConfigDialogBase(QWidget *parent = nullptr);
 
+	void SetCurrentTab(int index);
+
 private slots:
 	/**
    * @brief Override of accept to save preferences to Config.

app/dialog/preferences/preferences.cpp

@@ -38,7 +38,7 @@
 namespace olive
 {
 
-PreferencesDialog::PreferencesDialog(MainWindow *main_window)
+PreferencesDialog::PreferencesDialog(MainWindow *main_window, int start_tab)
 	: ConfigDialogBase(main_window)
 {
 	setWindowTitle(tr("Preferences"));
@@ -49,6 +49,8 @@ PreferencesDialog::PreferencesDialog(MainWindow *main_window)
 	AddTab(new PreferencesDiskTab(), tr("Disk"));
 	AddTab(new PreferencesAudioTab(), tr("Audio"));
 	AddTab(new PreferencesKeyboardTab(main_window), tr("Keyboard"));
+
+	SetCurrentTab(start_tab);
 }
 
 void PreferencesDialog::AcceptEvent()

app/dialog/preferences/preferences.h

@@ -45,7 +45,7 @@ class PreferencesDialog : public ConfigDialogBase {
 	Q_OBJECT
 
 public:
-	PreferencesDialog(MainWindow *main_window);
+	PreferencesDialog(MainWindow *main_window, int start_tab = 0);
 
 protected:
 	virtual void AcceptEvent() override;

app/dialog/preferences/tabs/preferencesdisktab.cpp

@@ -29,6 +29,7 @@
 #include <QMessageBox>
 
 #include "common/filefunctions.h"
+#include "config/config.h"
 
 namespace olive
 {
@@ -92,6 +93,60 @@ PreferencesDiskTab::PreferencesDiskTab()
 		OLIVE_CONFIG("DiskCacheBehind").value<rational>().toDouble());
 	cache_behavior_layout->addWidget(cache_behind_slider_, row, 3);
 
+	row++;
+
+	QGroupBox *proxy_group = new QGroupBox(tr("Proxy Settings"));
+	outer_layout->addWidget(proxy_group);
+	QGridLayout *proxy_layout = new QGridLayout(proxy_group);
+
+	int proxy_row = 0;
+
+	proxy_layout->addWidget(new QLabel(tr("Proxy Width:")), proxy_row, 0);
+	proxy_width_slider_ = new IntegerSlider();
+	proxy_width_slider_->SetMinimum(160);
+	proxy_width_slider_->SetMaximum(4096);
+	proxy_width_slider_->SetValue(
+		OLIVE_CONFIG("ProxyWidth").value<int>());
+	proxy_layout->addWidget(proxy_width_slider_, proxy_row, 1);
+
+	proxy_layout->addWidget(new QLabel(tr("Proxy Height:")), proxy_row, 2);
+	proxy_height_slider_ = new IntegerSlider();
+	proxy_height_slider_->SetMinimum(120);
+	proxy_height_slider_->SetMaximum(2160);
+	proxy_height_slider_->SetValue(
+		OLIVE_CONFIG("ProxyHeight").value<int>());
+	proxy_layout->addWidget(proxy_height_slider_, proxy_row, 3);
+
+	proxy_row++;
+
+	proxy_layout->addWidget(new QLabel(tr("Proxy CRF:")), proxy_row, 0);
+	proxy_crf_slider_ = new IntegerSlider();
+	proxy_crf_slider_->SetMinimum(0);
+	proxy_crf_slider_->SetMaximum(51);
+	proxy_crf_slider_->SetValue(
+		OLIVE_CONFIG("ProxyCRF").value<int>());
+	proxy_layout->addWidget(proxy_crf_slider_, proxy_row, 1);
+
+	proxy_layout->addWidget(new QLabel(tr("Proxy Preset:")), proxy_row, 2);
+	proxy_preset_combo_ = new QComboBox();
+	const QStringList presets = {
+		QStringLiteral("ultrafast"),
+		QStringLiteral("superfast"),
+		QStringLiteral("veryfast"),
+		QStringLiteral("faster"),
+		QStringLiteral("fast"),
+		QStringLiteral("medium"),
+		QStringLiteral("slow"),
+		QStringLiteral("slower"),
+		QStringLiteral("veryslow"),
+	};
+	for (const QString &preset : presets) {
+		proxy_preset_combo_->addItem(preset);
+	}
+	proxy_preset_combo_->setCurrentText(
+		OLIVE_CONFIG("ProxyPreset").toString());
+	proxy_layout->addWidget(proxy_preset_combo_, proxy_row, 3);
+
 	outer_layout->addStretch();
 }
 
@@ -129,6 +184,11 @@ void PreferencesDiskTab::Accept(MultiUndoCommand *command)
 		rational::fromDouble(cache_behind_slider_->GetValue()));
 	OLIVE_CONFIG("DiskCacheAhead") = QVariant::fromValue(
 		rational::fromDouble(cache_ahead_slider_->GetValue()));
+
+	OLIVE_CONFIG("ProxyWidth") = static_cast<int>(proxy_width_slider_->GetValue());
+	OLIVE_CONFIG("ProxyHeight") = static_cast<int>(proxy_height_slider_->GetValue());
+	OLIVE_CONFIG("ProxyCRF") = static_cast<int>(proxy_crf_slider_->GetValue());
+	OLIVE_CONFIG("ProxyPreset") = proxy_preset_combo_->currentText();
 }
 
 }

app/dialog/preferences/tabs/preferencesdisktab.h

@@ -23,12 +23,14 @@
 #define PREFERENCESDISKTAB_H
 
 #include <QCheckBox>
+#include <QComboBox>
 #include <QLineEdit>
 #include <QPushButton>
 
 #include "dialog/configbase/configdialogbase.h"
 #include "render/diskmanager.h"
 #include "widget/slider/floatslider.h"
+#include "widget/slider/integerslider.h"
 #include "widget/path/pathwidget.h"
 
 namespace olive
@@ -51,6 +53,11 @@ private:
 	FloatSlider *cache_behind_slider_;
 
 	DiskCacheFolder *default_disk_cache_folder_;
+
+	IntegerSlider *proxy_width_slider_;
+	IntegerSlider *proxy_height_slider_;
+	IntegerSlider *proxy_crf_slider_;
+	QComboBox *proxy_preset_combo_;
 };
 
 }