image orientation

README.md

@@ -7,6 +7,15 @@ Simple slideshow showing random images from specified directory
 slide /path/to/images
 ```
 
+## Dependencies
+
+* libexif
+* qt5
+
+```
+sudo apt install libexif-dev qtdeclarative5-dev-tools
+```
+
 ## Build
 
 ```

src/mainwindow.cpp

@@ -5,6 +5,8 @@
 #include <QBitmap>
 #include <QKeyEvent>
 #include <QGraphicsBlurEffect>
+#include <libexif/exif-data.h>
+#include <iostream>
 
 MainWindow::MainWindow(QWidget *parent) :
     QMainWindow(parent),
@@ -18,7 +20,7 @@ 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, 230);}");
+    label->setStyleSheet("QLabel {  background-color: rgba(0, 0, 0, 180);}");
     label->setAlignment(Qt::AlignHCenter | Qt::AlignVCenter);
     update();
 
@@ -51,32 +53,84 @@ void MainWindow::setImage(std::string path)
     updateImage();
 }
 
+int MainWindow::getImageRotation()
+{
+    if (currentImage == "")
+        return 0;
+
+    int orientation = 0;
+    ExifData *exifData = exif_data_new_from_file(currentImage.c_str());
+    if (exifData)
+    {
+      ExifByteOrder byteOrder = exif_data_get_byte_order(exifData);
+      ExifEntry *exifEntry = exif_data_get_entry(exifData, EXIF_TAG_ORIENTATION);
+
+      if (exifEntry)
+      {
+        orientation = exif_get_short(exifEntry->data, byteOrder);
+      }
+      exif_data_free(exifData);
+    }
+
+    int degrees = 0;
+    switch(orientation) {
+        case 8:
+        degrees = 270;
+        break;
+        case 3:
+        degrees = 180;
+        break;
+        case 6:
+        degrees = 90;
+        break;
+    }
+
+    return degrees;
+}
+
 void MainWindow::updateImage()
 {
     if (currentImage == "")
-    {
         return;
-    }
+
-    QLabel *label = this->findChild<QLabel*>("image");
     QPixmap p( currentImage.c_str() );
-    int w = label->width();
+    QPixmap rotated = getRotatedPixmap(p);
-    int h = label->height();
+    QPixmap scaled = getScaledPixmap(rotated);
-    QPixmap scaled = p.scaled(w,h,Qt::KeepAspectRatio);
+
+    QLabel *label = this->findChild<QLabel*>("image");
     label->setPixmap(scaled);
 
+    drawBackground(rotated, scaled);
+    update();
+}
 
+QPixmap MainWindow::getRotatedPixmap(const QPixmap& p)
+{
+    QMatrix matrix;
+    matrix.rotate(getImageRotation());
+    return p.transformed(matrix);
+}
+
+QPixmap MainWindow::getScaledPixmap(const QPixmap& p)
+{
+    int w = width();
+    int h = height();
+    return p.scaled(w, h, Qt::KeepAspectRatio);
+}
+
+void MainWindow::drawBackground(const QPixmap& originalSize, const QPixmap& scaled)
+{
     QPalette palette;
     if (scaled.width() < width()) {
-        QPixmap background = p.scaledToWidth(width());
+        QPixmap background = originalSize.scaledToWidth(width());
         QRect rect(0, (background.height() - height())/2, width(), height());
         background = background.copy(rect);
         palette.setBrush(QPalette::Background, background);
     } else {
-        QPixmap background = p.scaledToHeight(height());
+        QPixmap background = originalSize.scaledToHeight(height());
         QRect rect((background.width() - width())/2, 0, width(), height());
         background = background.copy(rect);
         palette.setBrush(QPalette::Background, background);
     }
     this->setPalette(palette);
-    update();
 }

src/mainwindow.h

@@ -2,6 +2,7 @@
 #define MAINWINDOW_H
 
 #include <QMainWindow>
+#include <QPixmap>
 
 namespace Ui {
 class MainWindow;
@@ -25,6 +26,11 @@ private:
     QLabel *image;
     std::string currentImage;
     void updateImage();
+    int getImageRotation();
+
+    QPixmap getRotatedPixmap(const QPixmap& p);
+    QPixmap getScaledPixmap(const QPixmap& p);
+    void drawBackground(const QPixmap& originalSize, const QPixmap& scaled);
 };
 
 #endif // MAINWINDOW_H

src/slide.pro

@@ -37,3 +37,5 @@ FORMS += \
 
 target.path = /usr/local/bin/
 INSTALLS += target
+
+unix|win32: LIBS += -lexif

src/slide.pro.user

@@ -0,0 +1,336 @@
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+    <value type="bool" key="Analyzer.Valgrind.ShowReachable">false</value>
+    <value type="bool" key="Analyzer.Valgrind.TrackOrigins">true</value>
+    <value type="QString" key="Analyzer.Valgrind.ValgrindExecutable">valgrind</value>
+    <valuelist type="QVariantList" key="Analyzer.Valgrind.VisibleErrorKinds">
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+    <value type="int" key="PE.EnvironmentAspect.Base">2</value>
+    <valuelist type="QVariantList" key="PE.EnvironmentAspect.Changes"/>
+    <value type="QString" key="ProjectExplorer.ProjectConfiguration.DefaultDisplayName">slide</value>
+    <value type="QString" key="ProjectExplorer.ProjectConfiguration.DisplayName"></value>
+    <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">Qt4ProjectManager.Qt4RunConfiguration:/home/manuel/slide/src/slide.pro</value>
+    <value type="bool" key="QmakeProjectManager.QmakeRunConfiguration.UseLibrarySearchPath">true</value>
+    <value type="QString" key="Qt4ProjectManager.Qt4RunConfiguration.CommandLineArguments"></value>
+    <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="uint" key="RunConfiguration.QmlDebugServerPort">3768</value>
+    <value type="bool" key="RunConfiguration.UseCppDebugger">false</value>
+    <value type="bool" key="RunConfiguration.UseCppDebuggerAuto">true</value>
+    <value type="bool" key="RunConfiguration.UseMultiProcess">false</value>
+    <value type="bool" key="RunConfiguration.UseQmlDebugger">false</value>
+    <value type="bool" key="RunConfiguration.UseQmlDebuggerAuto">true</value>
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+ </data>
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+ </data>
+ <data>
+  <variable>ProjectExplorer.Project.Updater.FileVersion</variable>
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+ </data>
+ <data>
+  <variable>Version</variable>
+  <value type="int">18</value>
+ </data>
+</qtcreator>