Use non-filling resize on server side. Client does filling.

Cargo.toml

@@ -40,3 +40,7 @@ load_image = "2.12.0"
 [[bench]]
 name = "image"
 harness = false
+
+# Build dependencies with release optimizations even in dev mode.
+[profile.dev.package."*"]
+opt-level = 3

react-slideshow/src/App.js

@@ -5,9 +5,22 @@ import {
   Route,
   useParams
 } from "react-router-dom";
-
+import Random from './rand';
 import './App.css';
 
+let CONFIG;
+if (process.env.NODE_ENV === 'production') {
+  CONFIG = {
+    sleepTimeSeconds: 5 * 60,
+    showUI: false,
+  }
+} else {
+  CONFIG = {
+    sleepTimeSeconds: 10,
+    showUI: true,
+  }
+}
+
 const IMAGE_CHUNK = 256;
 const roundup = (v, mod) => {
   let r = v % mod;
@@ -18,6 +31,20 @@ const roundup = (v, mod) => {
   }
 };
 
+/**
+ * Shuffles array in place. ES6 version
+ * From https://stackoverflow.com/questions/6274339/how-can-i-shuffle-an-array
+ * @param {Array} a items An array containing the items.
+ */
+function shuffle(a) {
+  let rng = new Random(new Date().getDay());
+    for (let i = a.length - 1; i > 0; i--) {
+        const j = Math.floor(rng.nextFloat() * (i + 1));
+        [a[i], a[j]] = [a[j], a[i]];
+    }
+    return a;
+}
+
 class Album extends React.Component {
   constructor(props) {
     super(props);
@@ -25,6 +52,7 @@ class Album extends React.Component {
       error: null,
       mediaItems: null,
       idx: 0,
+      showUI: props.showUI,
     };
   }
   componentDidMount() {
@@ -52,18 +80,44 @@ class Album extends React.Component {
       h = roundup(h, IMAGE_CHUNK);
       w = (h/ratio).toFixed();
     }
+    console.log(`Window size ${window.innerWidth}x${window.innerHeight} with a devicePixelRatio of ${window.devicePixelRatio} for a total size of ${w}x${h}`);
 
     //let w = roundup(window.innerWidth*window.devicePixelRatio, IMAGE_CHUNK);
     //let h = roundup(window.innerHeight*window.devicePixelRatio, IMAGE_CHUNK);
-    let {idx, error, mediaItems} = this.state;
+    let {idx, error, mediaItems, showUI} = this.state;
     if (error !== null) {
       return <h2>Error: {JSON.stringify(error)}</h2>;
     } else if (mediaItems !== null) {
-      let numImages = mediaItems.length;
+      let landscapes = mediaItems.filter((mi) => {
+        let md = mi.mediaMetadata;
+        let ratio = md.width/md.height;
+        return ratio > 1;
+      });
+
+      let portraits = mediaItems.filter((mi) => {
+        let md = mi.mediaMetadata;
+        let ratio = md.width/md.height;
+        return ratio <= 1;
+      });
+
+      console.log(`${landscapes.length} landscape photos`);
+      console.log(`${portraits.length} portraits photos`);
+      let photos;
+      if (ratio > 1) {
+        console.log('display in landscape mode');
+        photos = landscapes;
+      } else {
+        console.log('display in portrait mode');
+        photos = portraits;
+      }
+      photos = shuffle(photos);
+
+      let numImages = photos.length;
       let nextIdx = (idx+1)%numImages;
       let prevIdx = (numImages+idx-1)%numImages;
-      let image = mediaItems[idx];
-      let nextImage = mediaItems[nextIdx];
+      let image = photos[idx];
+      let nextImage = photos[nextIdx];
+      let prevImage = photos[prevIdx];
       let style = {
         height: '100%',
         width: '100%',
@@ -74,26 +128,44 @@ class Album extends React.Component {
         backgroundSize: 'cover',
       };
       let prefetchStyle = {
-        // display: 'none'
         position: 'absolute',
-        right: 0,
-        bottom: 0,
         width: '25%',
         height: '25%',
+        bottom: 0,
       };
-      console.log(`window.devicePixelRatio ${window.devicePixelRatio}`);
-      return <div style={style} onClick={(e)=>{
-        e.stopPropagation();
-        this.setState({idx: nextIdx})
-      }}>
-        <img
-          style={prefetchStyle}
+      let leftPrefetchStyle = {
+        left: 0,
+        ...prefetchStyle
+      };
+      let rightPrefetchStyle = {
+        right: 0,
+        ...prefetchStyle
+      };
+      let ui;
+      if (showUI) {
+        ui = <div>
+          <img
+          style={leftPrefetchStyle}
           onClick={(e)=>{
             e.stopPropagation();
             this.setState({idx: prevIdx})
           }}
+          src={`/api/image/${prevImage.id}?w=${w}&h=${h}`} alt="prefetch prev" />
+          <img
+          style={rightPrefetchStyle}
+          onClick={(e)=>{
+            e.stopPropagation();
+            this.setState({idx: nextIdx})
+          }}
           src={`/api/image/${nextImage.id}?w=${w}&h=${h}`} alt="prefetch next" />
         </div>;
+      }
+      return <div style={style} onClick={(e)=>{
+        e.stopPropagation();
+        this.setState({showUI: !showUI})
+      }}>
+        { ui }
+        </div>;
     } else {
       return <h2>Loading...</h2>;
     }
@@ -141,14 +213,15 @@ class AlbumIndex extends React.Component {
   }
 }
 
-const AlbumRoute = () => {
+const AlbumRoute = ({showUI}) => {
   // We can use the `useParams` hook here to access
   // the dynamic pieces of the URL.
   let { albumId } = useParams();
-  return <Album album={albumId} />;
+  return <Album album={albumId} showUI={showUI} />;
 }
 
 const App = () => {
+  let {showUI} = CONFIG;
   return <Router>
       <Switch>
         <Route exact path="/">
@@ -157,7 +230,7 @@ const App = () => {
           </div>
         </Route>
         <Route exact path="/:albumId">
-          <AlbumRoute />
+          <AlbumRoute showUI={showUI} />
         </Route>
       </Switch>
     </Router>

react-slideshow/src/rand.js

@@ -0,0 +1,30 @@
+// From https://gist.github.com/blixt/f17b47c62508be59987b
+/**
+ * Creates a pseudo-random value generator. The seed must be an integer.
+ *
+ * Uses an optimized version of the Park-Miller PRNG.
+ * http://www.firstpr.com.au/dsp/rand31/
+ */
+function Random(seed) {
+  console.log(`Seeding prng with ${seed}`);
+  this._seed = seed % 2147483647;
+  if (this._seed <= 0) this._seed += 2147483646;
+}
+
+/**
+ * Returns a pseudo-random value between 1 and 2^32 - 2.
+ */
+Random.prototype.next = function () {
+  return this._seed = this._seed * 16807 % 2147483647;
+};
+
+
+/**
+ * Returns a pseudo-random floating point number in range [0, 1).
+ */
+Random.prototype.nextFloat = function (opt_minOrMax, opt_max) {
+  // We know that result of next() will be 1 to 2147483646 (inclusive).
+  return (this.next() - 1) / 2147483646;
+};
+
+export default Random;

src/library.rs

@@ -25,7 +25,7 @@ use rocksdb::IteratorMode;
 use rocksdb::DB;
 
 // Used to ensure DB is invalidated after schema changes.
-const LIBRARY_GENERATION: &'static str = "13";
+const LIBRARY_GENERATION: &'static str = "14";
 
 #[derive(Clone)]
 pub struct Library {
@@ -116,6 +116,25 @@ pub fn resize(
     img: &DynamicImage,
     dimensions: (Option<u32>, Option<u32>),
     filter: FilterType,
+) -> DynamicImage {
+    let (w, h) = dimensions;
+    let (orig_w, orig_h) = img.dimensions();
+    let (w, h) = match (w, h) {
+        (Some(w), Some(h)) => (w, h),
+        (Some(w), None) => (w, orig_h * w / orig_w),
+        (None, Some(h)) => (orig_w * h / orig_h, h),
+        (None, None) => (orig_w, orig_h),
+    };
+    match filter {
+        FilterType::Builtin(filter) => img.resize(w, h, filter),
+        FilterType::Nearest => unimplemented!(), //resize_to_fill_nearest(w, h, img),
+    }
+}
+
+pub fn resize_to_fill(
+    img: &DynamicImage,
+    dimensions: (Option<u32>, Option<u32>),
+    filter: FilterType,
 ) -> DynamicImage {
     let (w, h) = dimensions;
     let (orig_w, orig_h) = img.dimensions();
@@ -261,11 +280,13 @@ impl Library {
     fn generational_key(generation: &str, key: &str) -> String {
         format!("{}/{}", generation, key)
     }
+
     pub fn generate_thumbnail(
         &self,
         media_items_id: &str,
         dimensions: (Option<u32>, Option<u32>),
         filter: FilterType,
+        fill: bool,
     ) -> Result<Vec<u8>, Box<dyn std::error::Error>> {
         match self.original(&media_items_id) {
             None => {
@@ -275,7 +296,11 @@ impl Library {
             Some(path) => {
                 let orig_img = load_image(&path, dimensions.0, dimensions.1)?;
                 //.map_err(|e| io::Error::new(io::ErrorKind::Other, e))?;
-                let img = resize(&orig_img, dimensions, filter);
+                let img = if fill {
+                    resize_to_fill(&orig_img, dimensions, filter)
+                } else {
+                    resize(&orig_img, dimensions, filter)
+                };
                 let buf = save_to_jpeg_bytes(&img)
                     .map_err(|e| io::Error::new(io::ErrorKind::Other, e))?;
                 Ok(buf)
@@ -286,6 +311,7 @@ impl Library {
         &self,
         media_items_id: &str,
         dimensions: (Option<u32>, Option<u32>),
+        fill: bool,
     ) -> Option<Vec<u8>> {
         fn cache_key(media_items_id: &str, dimensions: (Option<u32>, Option<u32>)) -> String {
             let dim = match dimensions {
@@ -300,18 +326,15 @@ impl Library {
         let db = self.cache_db.clone();
         match db.get(key.as_bytes()) {
             // Cache hit, return bytes as-is.
-            Ok(Some(bytes)) => {
-                info!("cache HIT {}", key);
-                Some(bytes)
-            }
+            Ok(Some(bytes)) => Some(bytes),
             // Cache miss, fill cache and return.
             Ok(None) => {
                 info!("cache MISS {}", key);
                 let bytes = match self.generate_thumbnail(
                     media_items_id,
                     dimensions,
-                    FilterType::Nearest,
-                    //FilterType::Builtin(imageops::FilterType::Lanczos3),
+                    FilterType::Builtin(imageops::FilterType::Lanczos3),
+                    fill,
                 ) {
                     Ok(bytes) => bytes,
                     Err(e) => {

src/web.rs

@@ -73,6 +73,7 @@ fn album(lib: Library, id: String) -> Result<impl warp::Reply, warp::Rejection>
 struct ImageParams {
     w: Option<u32>,
     h: Option<u32>,
+    fill: Option<bool>,
 }
 
 fn image(
@@ -81,7 +82,11 @@ fn image(
     params: ImageParams,
 ) -> Result<impl warp::Reply, warp::Rejection> {
     // TODO(wathiede): add caching headers.
-    match lib.thumbnail(&media_items_id, (params.w, params.h)) {
+    match lib.thumbnail(
+        &media_items_id,
+        (params.w, params.h),
+        params.fill.unwrap_or(false),
+    ) {
         None => {
             warn!("Couldn't find original {}", &media_items_id);
             Err(warp::reject::not_found())
@@ -121,7 +126,8 @@ pub fn run(addr: SocketAddr, root: PathBuf) -> Result<(), Box<dyn Error>> {
     // Fallback, always keep this last.
     let api = api.or(index);
 
-    let api = api.with(warp::log("photosync"));
+    //let api = api.with(warp::log("photosync"));
+
     // We don't want metrics & heath checking filling up the logs, so we add this handler after
     // wrapping with the log filter.
     let routes = metrics().or(api);