Move scaleImage() in Utils

include/Utils.h

@@ -26,4 +26,32 @@ firstChar(const QString &input);
 //! Get a human readable file size with the appropriate units attached.
 QString
 humanReadableFileSize(uint64_t bytes);
+
+//! Scale down an image to fit to the given width & height limitations.
+template<class ImageType>
+ImageType
+scaleDown(uint64_t max_width, uint64_t max_height, const ImageType &source)
+{
+        if (source.isNull())
+                return source;
+
+        auto width_ratio  = (double)max_width / (double)source.width();
+        auto height_ratio = (double)max_height / (double)source.height();
+
+        auto min_aspect_ratio = std::min(width_ratio, height_ratio);
+
+        int final_width  = 0;
+        int final_height = 0;
+
+        if (min_aspect_ratio > 1) {
+                final_width  = source.width();
+                final_height = source.height();
+        } else {
+                final_width  = source.width() * min_aspect_ratio;
+                final_height = source.height() * min_aspect_ratio;
+        }
+
+        return source.scaled(
+          final_width, final_height, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
+}
 }

include/dialogs/ImageOverlay.h

@@ -37,8 +37,6 @@ signals:
         void closing();
 
 private:
-        void scaleImage(int width, int height);
-
         QPixmap originalImage_;
         QPixmap image_;
 

include/timeline/widgets/ImageItem.h

@@ -53,7 +53,6 @@ private slots:
         void imageDownloaded(const QString &event_id, const QPixmap &img);
 
 private:
-        void scaleImage();
         void openUrl();
 
         int max_width_  = 500;

src/dialogs/ImageOverlay.cc

@@ -19,6 +19,7 @@
 #include <QDesktopWidget>
 #include <QPainter>
 
+#include "Utils.h"
 #include "dialogs/ImageOverlay.h"
 
 using namespace dialogs;
@@ -47,33 +48,6 @@ ImageOverlay::ImageOverlay(QPixmap image, QWidget *parent)
         raise();
 }
 
-// TODO: Move this into Utils
-void
-ImageOverlay::scaleImage(int max_width, int max_height)
-{
-        if (originalImage_.isNull())
-                return;
-
-        auto width_ratio  = (double)max_width / (double)originalImage_.width();
-        auto height_ratio = (double)max_height / (double)originalImage_.height();
-
-        auto min_aspect_ratio = std::min(width_ratio, height_ratio);
-
-        int final_width  = 0;
-        int final_height = 0;
-
-        if (min_aspect_ratio > 1) {
-                final_width  = originalImage_.width();
-                final_height = originalImage_.height();
-        } else {
-                final_width  = originalImage_.width() * min_aspect_ratio;
-                final_height = originalImage_.height() * min_aspect_ratio;
-        }
-
-        image_ = originalImage_.scaled(
-          final_width, final_height, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
-}
-
 void
 ImageOverlay::paintEvent(QPaintEvent *event)
 {
@@ -93,7 +67,7 @@ ImageOverlay::paintEvent(QPaintEvent *event)
         int max_width  = screen_.width() - 2 * outer_margin;
         int max_height = screen_.height();
 
-        scaleImage(max_width, max_height);
+        image_ = utils::scaleDown<QPixmap>(max_width, max_height, originalImage_);
 
         int diff_x = max_width - image_.width();
         int diff_y = max_height - image_.height();

src/timeline/widgets/ImageItem.cc

@@ -23,6 +23,7 @@
 #include <QPixmap>
 
 #include "Config.h"
+#include "Utils.h"
 #include "dialogs/ImageOverlay.h"
 #include "timeline/widgets/ImageItem.h"
 
@@ -113,30 +114,6 @@ ImageItem::openUrl()
                 qWarning() << "Could not open url" << url_.toString();
 }
 
-void
-ImageItem::scaleImage()
-{
-        if (image_.isNull())
-                return;
-
-        auto width_ratio  = (double)max_width_ / (double)image_.width();
-        auto height_ratio = (double)max_height_ / (double)image_.height();
-
-        auto min_aspect_ratio = std::min(width_ratio, height_ratio);
-
-        if (min_aspect_ratio > 1) {
-                width_  = image_.width();
-                height_ = image_.height();
-        } else {
-                width_  = image_.width() * min_aspect_ratio;
-                height_ = image_.height() * min_aspect_ratio;
-        }
-
-        setFixedSize(width_, height_);
-        scaled_image_ =
-          image_.scaled(width_, height_, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
-}
-
 QSize
 ImageItem::sizeHint() const
 {
@@ -149,8 +126,13 @@ ImageItem::sizeHint() const
 void
 ImageItem::setImage(const QPixmap &image)
 {
-        image_ = image;
+        image_        = image;
-        scaleImage();
+        scaled_image_ = utils::scaleDown<QPixmap>(max_width_, max_height_, image_);
+
+        width_  = scaled_image_.width();
+        height_ = scaled_image_.height();
+
+        setFixedSize(width_, height_);
         update();
 }
 
@@ -176,9 +158,15 @@ ImageItem::mousePressEvent(QMouseEvent *event)
 void
 ImageItem::resizeEvent(QResizeEvent *event)
 {
-        Q_UNUSED(event);
+        if (!image_)
+                return QWidget::resizeEvent(event);
 
-        scaleImage();
+        scaled_image_ = utils::scaleDown<QPixmap>(max_width_, max_height_, image_);
+
+        width_  = scaled_image_.width();
+        height_ = scaled_image_.height();
+
+        setFixedSize(width_, height_);
 }
 
 void