Add a setting to control the scaling method used

YACReader/configuration.h

@@ -10,6 +10,7 @@
 #include <QDate>
 
 #include "yacreader_global_gui.h"
+#include "resize_image.h"
 
 #define CONF_FILE_PATH "."
 #define SLIDE_ASPECT_RATIO 1.585
@@ -117,6 +118,9 @@ public:
 
     MouseMode getMouseMode() { return static_cast<MouseMode>(settings->value(MOUSE_MODE, MouseMode::Normal).toInt()); }
     void setMouseMode(MouseMode mouseMode) { settings->setValue(MOUSE_MODE, static_cast<int>(mouseMode)); }
+
+    ScaleMethod getScalingMethod() { return static_cast<ScaleMethod>(settings->value(SCALING_METHOD, static_cast<int>(ScaleMethod::Lanczos)).toInt()); }
+    void setScalingMethod(ScaleMethod method) { settings->setValue(SCALING_METHOD, static_cast<int>(method)); }
 };
 
 }

YACReader/options_dialog.cpp

@@ -12,6 +12,7 @@
 #include <QLabel>
 #include <QColorDialog>
 #include <QCheckBox>
+#include <QComboBox>
 #include <QMessageBox>
 #include "theme_manager.h"
 #include "theme_factory.h"
@@ -198,6 +199,23 @@ OptionsDialog::OptionsDialog(QWidget *parent)
     doublePageBoxLayout->addWidget(coverSPCheckBox);
     doublePageBox->setLayout(doublePageBoxLayout);
     layoutImageV->addWidget(doublePageBox);
+
+    auto scalingBox = new QGroupBox(tr("Scaling"));
+    auto scalingLayout = new QHBoxLayout();
+    scalingLayout->addWidget(new QLabel(tr("Scaling method")));
+    scalingMethodCombo = new QComboBox();
+    scalingMethodCombo->addItem(tr("Nearest (fast, low quality)"));
+    scalingMethodCombo->addItem(tr("Bilinear"));
+    scalingMethodCombo->addItem(tr("Lanczos (better quality)"));
+    connect(scalingMethodCombo, &QComboBox::currentIndexChanged, this, [this](int index) {
+        Configuration::getConfiguration().setScalingMethod(static_cast<ScaleMethod>(index));
+        emit changedImageOptions();
+    });
+    scalingLayout->addWidget(scalingMethodCombo);
+    scalingLayout->addStretch();
+    scalingBox->setLayout(scalingLayout);
+    layoutImageV->addWidget(scalingBox);
+
     layoutImageV->addStretch();
 
     // IMAGE ADJUSTMENTS END -----------------------------
@@ -294,6 +312,9 @@ void OptionsDialog::saveOptions()
     }
     Configuration::getConfiguration().setMouseMode(mouseMode);
 
+    Configuration::getConfiguration().setScalingMethod(static_cast<ScaleMethod>(scalingMethodCombo->currentIndex()));
+    emit changedImageOptions();
+
     YACReaderOptionsDialog::saveOptions();
 }
 
@@ -330,6 +351,11 @@ void OptionsDialog::restoreOptions(QSettings *settings)
 #endif
     disableScrollAnimations->setChecked(settings->value(DISABLE_SCROLL_ANIMATION, defaultDisableScrollAnimationsValue).toBool());
 
+    {
+        QSignalBlocker blocker(scalingMethodCombo);
+        scalingMethodCombo->setCurrentIndex(static_cast<int>(Configuration::getConfiguration().getScalingMethod()));
+    }
+
     auto mouseMode = Configuration::getConfiguration().getMouseMode();
 
     switch (mouseMode) {

YACReader/options_dialog.h

@@ -6,6 +6,7 @@
 
 #include <QPointer>
 
+class QComboBox;
 class QDialog;
 class QLabel;
 class QLineEdit;
@@ -62,6 +63,8 @@ private:
 
     QColor currentColor;
 
+    QComboBox *scalingMethodCombo;
+
     QRadioButton *normalMouseModeRadioButton;
     QRadioButton *leftRightNavigationMouseModeRadioButton;
     QRadioButton *hotAreasMouseModeRadioButton;

common/yacreader_global_gui.h

@@ -39,6 +39,7 @@
 #define USE_SINGLE_SCROLL_STEP_TO_TURN_PAGE "USE_SINGLE_SCROLL_STEP_TO_TURN_PAGE"
 #define DISABLE_SCROLL_ANIMATION "DISABLE_SCROLL_ANIMATION"
 #define MOUSE_MODE "MOUSE_MODE"
+#define SCALING_METHOD "SCALING_METHOD"
 
 #define FLOW_TYPE_GL "FLOW_TYPE_GL"
 #define Y_POSITION "Y_POSITION"