- Add "-a" argument to filter show pictures by aspect ratio (potrait, landscape or all)

README.md

@@ -17,7 +17,7 @@ This project is maintained by myself during my spare time. If you like and use i
 ## Usage
 
 ```
-slide [-t rotation_seconds] [-o background_opacity(0..255)] [-b blur_radius] -p image_folder [-r] [-O overlay_string]
+slide [-t rotation_seconds] [-a aspect] [-o background_opacity(0..255)] [-b blur_radius] -p image_folder [-r] [-O overlay_string]
 ```
 
 * `image_folder`: where to search for images (.jpg files)
@@ -25,6 +25,7 @@ slide [-t rotation_seconds] [-o background_opacity(0..255)] [-b blur_radius] -p
 * `-s` for shuffle instead of random image rotation
 * `-S` for sorted rotation (files ordered by name, first images then subfolders)
 * `rotation_seconds(default=30)`: time until next random image is chosen from the given folder
+* `aspect(default=a)`: the required aspect ratio of the picture to display. Valid values are 'a' (all), 'l' (landscape) and 'p' (portrait)
 * `background_opacity(default=150)`: opacity of the background filling image between 0 (black background) and 255
 * `blur_radius(default=20)`: blur radius of the background filling image
 * `-O` is used to create a overlay string.

src/imageselector.cpp

@@ -5,21 +5,86 @@
 #include <QTimer>
 #include <QApplication>
 #include <QDir>
+#include <libexif/exif-data.h>
 #include <iostream>
 #include <stdlib.h>     /* srand, rand */
 #include <time.h>       /* time */
 #include <algorithm>    // std::shuffle
 #include <random>       // std::default_random_engine
 
-ImageSelector::ImageSelector(std::unique_ptr<PathTraverser>& pathTraverser):
+ImageSelector::ImageSelector(std::unique_ptr<PathTraverser>& pathTraverser, char aspect):
-  pathTraverser(pathTraverser)
+  pathTraverser(pathTraverser), _aspect(aspect)
 {
 }
 
 ImageSelector::~ImageSelector(){}
 
-RandomImageSelector::RandomImageSelector(std::unique_ptr<PathTraverser>& pathTraverser):
+int ImageSelector::getImageRotation(const std::string &fileName)
-  ImageSelector(pathTraverser)
+{
+  int orientation = 0;
+  ExifData *exifData = exif_data_new_from_file(fileName.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;
+}
+
+bool ImageSelector::imageValidForAspect(const std::string &fileName)
+{
+  QPixmap p( fileName.c_str() );
+  int imageWidth = p.width();
+  int imageHeight = p.height();
+  int rotation = getImageRotation(fileName);
+  if ( rotation == 90 || rotation == 270 )
+  {
+    std::swap(imageWidth,imageHeight);
+  }
+
+  switch(_aspect)
+  {
+    case 'a':
+      // allow all
+      break;
+    case 'l':
+      if ( imageWidth < imageHeight ) 
+      {
+        return false;
+      }
+      break;
+    case 'p':
+      if ( imageHeight < imageWidth ) 
+      {
+        return false;
+      }
+      break;
+  }
+  return true;
+}
+
+
+RandomImageSelector::RandomImageSelector(std::unique_ptr<PathTraverser>& pathTraverser, char aspect):
+  ImageSelector(pathTraverser, aspect)
 {
   srand (time(NULL));
 }
@@ -30,10 +95,18 @@ std::string RandomImageSelector::getNextImage()
 {
   std:: string filename;
   try
+  {
+    while (filename.empty())
     {
       QStringList images = pathTraverser->getImages();
       unsigned int selectedImage = selectRandom(images);
       filename = pathTraverser->getImagePath(images.at(selectedImage).toStdString());
+      if (!imageValidForAspect(filename))
+      {
+        filename.clear();
+      }
+    }
+
   }
   catch(const std::string& err) 
   {
@@ -53,8 +126,8 @@ unsigned int RandomImageSelector::selectRandom(const QStringList& images) const
   return rand() % images.size();
 }
 
-ShuffleImageSelector::ShuffleImageSelector(std::unique_ptr<PathTraverser>& pathTraverser):
+ShuffleImageSelector::ShuffleImageSelector(std::unique_ptr<PathTraverser>& pathTraverser, char aspect):
-  ImageSelector(pathTraverser),
+  ImageSelector(pathTraverser, aspect),
   current_image_shuffle(-1),
   images()
 {
@@ -92,8 +165,8 @@ std::string ShuffleImageSelector::getNextImage()
   return filename;
 }
 
-SortedImageSelector::SortedImageSelector(std::unique_ptr<PathTraverser>& pathTraverser):
+SortedImageSelector::SortedImageSelector(std::unique_ptr<PathTraverser>& pathTraverser, char aspect):
-  ImageSelector(pathTraverser),
+  ImageSelector(pathTraverser, aspect),
   images()
 {
   srand (time(NULL));

src/imageselector.h

@@ -11,18 +11,21 @@ class PathTraverser;
 class ImageSelector
 {
 public:
-    ImageSelector(std::unique_ptr<PathTraverser>& pathTraverser);
+    ImageSelector(std::unique_ptr<PathTraverser>& pathTraverser, char aspect);
     virtual ~ImageSelector();
     virtual std::string getNextImage() = 0;
 
 protected:
+    int getImageRotation(const std::string &fileName);
+    bool imageValidForAspect(const std::string &fileName);
     std::unique_ptr<PathTraverser>& pathTraverser;
+    char _aspect;
 };
 
 class RandomImageSelector : public ImageSelector
 {
 public:
-    RandomImageSelector(std::unique_ptr<PathTraverser>& pathTraverser);
+    RandomImageSelector(std::unique_ptr<PathTraverser>& pathTraverser, char aspect);
     virtual ~RandomImageSelector();
     virtual std::string getNextImage();
 
@@ -33,7 +36,7 @@ private:
 class ShuffleImageSelector : public ImageSelector
 {
 public:
-    ShuffleImageSelector(std::unique_ptr<PathTraverser>& pathTraverser);
+    ShuffleImageSelector(std::unique_ptr<PathTraverser>& pathTraverser, char aspect);
     virtual ~ShuffleImageSelector();
     virtual std::string getNextImage();
 
@@ -45,7 +48,7 @@ private:
 class SortedImageSelector : public ImageSelector
 {
 public:
-    SortedImageSelector(std::unique_ptr<PathTraverser>& pathTraverser);
+    SortedImageSelector(std::unique_ptr<PathTraverser>& pathTraverser, char aspect);
     virtual ~SortedImageSelector();
     virtual std::string getNextImage();
 

src/main.cpp

@@ -29,12 +29,22 @@ int main(int argc, char *argv[])
   bool recursive = false;
   bool shuffle = false;
   bool sorted = false;
+  char aspect = 'a';
+  std::string valid_aspects = "alp"; // all, landscape, portait
   std::string overlay = "";
-  while ((opt = getopt(argc, argv, "b:p:t:o:O:rsS")) != -1) {
+  while ((opt = getopt(argc, argv, "b:p:t:o:O:a:rsS")) != -1) {
     switch (opt) {
       case 'p':
         path = optarg;
         break;
+      case 'a':
+        aspect = optarg[0];
+        if ( valid_aspects.find(aspect) == std::string::npos )
+        {
+          std::cout << "Invalid Aspect option, defaulting to all" << std::endl;
+          aspect = 'a';
+        }
+        break;
       case 't':
         rotationSeconds = atoi(optarg);
         break;
@@ -83,16 +93,17 @@ int main(int argc, char *argv[])
   std::unique_ptr<ImageSelector> selector;
   if (sorted)
   {
-    selector = std::unique_ptr<ImageSelector>(new SortedImageSelector(pathTraverser));
+    selector = std::unique_ptr<ImageSelector>(new SortedImageSelector(pathTraverser, aspect));
   }
   else if (shuffle)
   {
-    selector = std::unique_ptr<ImageSelector>(new ShuffleImageSelector(pathTraverser));
+    selector = std::unique_ptr<ImageSelector>(new ShuffleImageSelector(pathTraverser, aspect));
   }
   else
   {
-    selector = std::unique_ptr<ImageSelector>(new RandomImageSelector(pathTraverser));
+    selector = std::unique_ptr<ImageSelector>(new RandomImageSelector(pathTraverser, aspect));
   }
+  std::cout << "Rotation Time: " << rotationSeconds << std::endl;
   std::cout << "Overlay input: " << overlay << std::endl;
   Overlay o(overlay);
   w.setOverlay(&o);