From 3a9192b478d72df054aa8dbb8e326089c2ebb31a Mon Sep 17 00:00:00 2001
From: Colin McMillen <colin@semicolin.games>
Date: Tue, 25 Jul 2023 09:41:13 -0400
Subject: [PATCH] parse star ratings from canon image metadata

---
 Program.cs | 31 +++++++++++++++++++++++++++++--
 1 file changed, 29 insertions(+), 2 deletions(-)

diff --git a/Program.cs b/Program.cs
index 6164b43..7ffcdb0 100644
--- a/Program.cs
+++ b/Program.cs
@@ -7,9 +7,11 @@ using OpenTK.Windowing.GraphicsLibraryFramework;
 using Image = SixLabors.ImageSharp.Image;
 using SixLabors.Fonts;
 using SixLabors.ImageSharp.Metadata.Profiles.Exif;
+using SixLabors.ImageSharp.Metadata.Profiles.Xmp;
 using SixLabors.ImageSharp.Drawing.Processing;
 using SixLabors.ImageSharp.Drawing;
 using System.Runtime.CompilerServices;
+using System.Xml.Linq;
 
 namespace SemiColinGames;
 
@@ -150,6 +152,7 @@ public class Photo {
   public string FNumber = "<unk>";
   public string ExposureTime = "<unk>";
   public string IsoSpeed = "<unk>";
+  public int Rating = 0;
 
   private Texture texture;
   private Texture placeholder;
@@ -163,6 +166,7 @@ public class Photo {
 
   public async void Load() {
     image = await Image.LoadAsync<Rgba32>(File);
+    ParseRating(image);
     ExifProfile? exifs = image.Metadata.ExifProfile;
     if (exifs != null) {
       // FIXME: handle Orientation
@@ -236,6 +240,29 @@ public class Photo {
     }
   }
 
+  private void ParseRating(Image image) {
+    XmpProfile? xmp = image.Metadata.XmpProfile;
+    if (xmp == null) {
+      return;
+    }
+    XDocument? doc = xmp.GetDocument();
+    if (doc == null) {
+      return;
+    }
+    XElement? root = doc.Root;
+    if (root == null) {
+      return;
+    }
+    foreach (XElement elt in root.Descendants()) {
+      if (elt.Name == "{http://ns.adobe.com/xap/1.0/}Rating") {
+        int rating;
+        if (int.TryParse(elt.Value, out rating)) {
+          Rating = rating;
+        }
+      }
+    }
+  }
+
   public Texture Texture() {
     if (texture == placeholder && image != null) {
       texture = new Texture(image);
@@ -512,9 +539,9 @@ public class Game : GameWindow {
     GL.VertexAttribPointer(texCoordLocation, 2, VertexAttribPointerType.Float, false, 5 * sizeof(float), 3 * sizeof(float));
 
     // Load textures from JPEGs.
-    string[] files = Directory.GetFiles(@"c:\users\colin\desktop\photos-test\");
+    // string[] files = Directory.GetFiles(@"c:\users\colin\desktop\photos-test\");
     // string[] files = Directory.GetFiles(@"c:\users\colin\pictures\photos\2023\07\14\");
-    // string[] files = Directory.GetFiles(@"G:\DCIM\100EOSR6\");
+    string[] files = Directory.GetFiles(@"G:\DCIM\100EOSR6\");
     // string[] files = Directory.GetFiles(@"C:\Users\colin\Pictures\photos\2018\06\23");
     // string[] files = Directory.GetFiles(@"C:\Users\colin\Desktop\Germany all\104D7000");
     // string[] files = Directory.GetFiles(@"C:\Users\colin\Desktop\many-birds\");