Blur and Command line opts

* blur background image
* command line options for
        * background blur radius
        * background opacity
        * path to image folder
        * timeout for password rotation

src/main.cpp

@@ -5,27 +5,51 @@
 #include <sys/file.h>
 #include <errno.h>
 
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+void usage(std::string programName) {
+    std::cerr << "Usage: " << programName << " [-t rotation_seconds] [-o background_opacity(0..255)] [-b blur_radius] -p image_folder" << std::endl;
+}
+
 int main(int argc, char *argv[])
 {
+    unsigned int rotationSeconds = 30;
+    std::string path = "";
 
-    int pid_file = open("/tmp/slide.pid", O_CREAT | O_RDWR, 0666);
-    int rc = flock(pid_file, LOCK_EX | LOCK_NB);
-    if(rc) {
-        if(EWOULDBLOCK == errno) {
-            std::cout << "Already running. Exiting" << std::endl;
-            return 0;
-        }
-    }
-    if (argc < 2) {
-        std::cout << "Error: Path expected." << std::endl;
-        return 1;
-    }
     QApplication a(argc, argv);
 
     MainWindow w;
+    int opt;
+    while ((opt = getopt(argc, argv, "b:p:t:o:")) != -1) {
+        switch (opt) {
+        case 'p':
+            path = optarg;
+            break;
+        case 't':
+            rotationSeconds = atoi(optarg);
+            break;
+        case 'b':
+            w.setBlurRadius(atoi(optarg));
+            break;
+        case 'o':
+            w.setBackgroundOpacity(atoi(optarg));
+            break;
+        default: /* '?' */
+            usage(argv[0]);
+            return 1;
+        }
+    }
+
+    if (path.empty()) {
+        std::cout << "Error: Path expected." << std::endl;
+        usage(argv[0]);
+        return 1;
+    }
     w.show();
 
-    ImageSelector is(w, 30000, argv[1]);
+    ImageSelector is(w, rotationSeconds * 1000, path);
     is.start();
     return a.exec();
 }

src/mainwindow.cpp

@@ -7,11 +7,14 @@
 #include <QGraphicsBlurEffect>
 #include <libexif/exif-data.h>
 #include <iostream>
+#include <QPainter>
+#include <QGraphicsScene>
+#include <QGraphicsPixmapItem>
+#include <sstream>
 
 MainWindow::MainWindow(QWidget *parent) :
     QMainWindow(parent),
-    ui(new Ui::MainWindow),
-    image(new QLabel)
+    ui(new Ui::MainWindow)
 {
     ui->setupUi(this);
     setWindowFlags(windowFlags() | Qt::WindowStaysOnTopHint);
@@ -20,7 +23,6 @@ MainWindow::MainWindow(QWidget *parent) :
     QApplication::setOverrideCursor(Qt::BlankCursor);
     QLabel *label = this->findChild<QLabel*>("image");
     setCentralWidget(label);
-    label->setStyleSheet("QLabel {  background-color: rgba(0, 0, 0, 180);}");
     label->setAlignment(Qt::AlignHCenter | Qt::AlignVCenter);
     update();
 
@@ -100,7 +102,12 @@ void MainWindow::updateImage()
     QLabel *label = this->findChild<QLabel*>("image");
     label->setPixmap(scaled);
 
+    std::stringstream style;
+    style << "QLabel {  background-color: rgba(0, 0, 0, " << (255 - backgroundOpacity) << ");}";
+    label->setStyleSheet(style.str().c_str());
+
     drawBackground(rotated, scaled);
+
     update();
 }
 
@@ -122,15 +129,41 @@ void MainWindow::drawBackground(const QPixmap& originalSize, const QPixmap& scal
 {
     QPalette palette;
     if (scaled.width() < width()) {
-        QPixmap background = originalSize.scaledToWidth(width());
+        QPixmap background = blur(originalSize.scaledToWidth(width()));
         QRect rect(0, (background.height() - height())/2, width(), height());
         background = background.copy(rect);
         palette.setBrush(QPalette::Background, background);
     } else {
-        QPixmap background = originalSize.scaledToHeight(height());
+        QPixmap background = blur(originalSize.scaledToHeight(height()));
         QRect rect((background.width() - width())/2, 0, width(), height());
         background = background.copy(rect);
         palette.setBrush(QPalette::Background, background);
     }
     this->setPalette(palette);
 }
+
+QPixmap MainWindow::blur(const QPixmap& input)
+{
+    QGraphicsScene scene;
+    QGraphicsPixmapItem item;
+    item.setPixmap(input);
+    QGraphicsBlurEffect effect;
+    effect.setBlurRadius(blurRadius);
+    item.setGraphicsEffect(&effect);
+    scene.addItem(&item);
+    QImage res(input.size(), QImage::Format_ARGB32);
+    res.fill(Qt::transparent);
+    QPainter ptr(&res);
+    scene.render(&ptr, QRectF(), QRectF( 0, 0, input.width(), input.height()) );
+    return QPixmap::fromImage(res);
+}
+
+void MainWindow::setBlurRadius(unsigned int blurRadius)
+{
+    this->blurRadius = blurRadius;
+}
+
+void MainWindow::setBackgroundOpacity(unsigned int backgroundOpacity)
+{
+    this->backgroundOpacity = backgroundOpacity;
+}

src/mainwindow.h

@@ -20,17 +20,23 @@ public:
     void resizeEvent(QResizeEvent* event);
     ~MainWindow();
     void setImage(std::string path);
+    void setBlurRadius(unsigned int blurRadius);
+    void setBackgroundOpacity(unsigned int opacity);
 
 private:
     Ui::MainWindow *ui;
-    QLabel *image;
+
     std::string currentImage;
+    unsigned int blurRadius = 20;
+    unsigned int backgroundOpacity = 150;
+
     void updateImage();
     int getImageRotation();
 
     QPixmap getRotatedPixmap(const QPixmap& p);
     QPixmap getScaledPixmap(const QPixmap& p);
     void drawBackground(const QPixmap& originalSize, const QPixmap& scaled);
+    QPixmap blur(const QPixmap& input);
 };
 
 #endif // MAINWINDOW_H

src/slide.pro.user

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE QtCreatorProject>
-<!-- Written by QtCreator 4.6.2, 2019-01-21T21:06:46. -->
+<!-- Written by QtCreator 4.6.2, 2019-01-21T22:24:23. -->
 <qtcreator>
  <data>
   <variable>EnvironmentId</variable>
@@ -310,7 +310,7 @@
     <value type="QString" key="Qt4ProjectManager.Qt4RunConfiguration.ProFile">slide.pro</value>
     <value type="bool" key="Qt4ProjectManager.Qt4RunConfiguration.UseDyldImageSuffix">false</value>
     <value type="QString" key="Qt4ProjectManager.Qt4RunConfiguration.UserWorkingDirectory"></value>
-    <value type="QString" key="Qt4ProjectManager.Qt4RunConfiguration.UserWorkingDirectory.default"></value>
+    <value type="QString" key="Qt4ProjectManager.Qt4RunConfiguration.UserWorkingDirectory.default">/home/manuel/slide/build-slide-Desktop-Debug</value>
     <value type="uint" key="RunConfiguration.QmlDebugServerPort">3768</value>
     <value type="bool" key="RunConfiguration.UseCppDebugger">false</value>
     <value type="bool" key="RunConfiguration.UseCppDebuggerAuto">true</value>