[banshee] [ArtworkManager] Maintain aspect ratio (bgo#613359)

[Alexander Kojevnikov <alexk src gnome org>]

commit ef0119cef7386d36894b6def6f9876dbf6fbd673
Author: Alexander Kojevnikov <alexander kojevnikov com>
Date:   Wed Apr 14 18:30:00 2010 +1000

    [ArtworkManager] Maintain aspect ratio (bgo#613359)
    
    Make the album art square when scaling only if width and height
    difference is within 20%.
    
    This fixes a common problem when non-square album art (e.g. from
    tape cassettes) is scaled to an ugly-looking square image while
    still scaling near-square covers.

 .../Banshee.Collection.Gui/ArtworkManager.cs       |   13 ++++++++++++-
 1 files changed, 12 insertions(+), 1 deletions(-)
---
diff --git a/src/Core/Banshee.ThickClient/Banshee.Collection.Gui/ArtworkManager.cs b/src/Core/Banshee.ThickClient/Banshee.Collection.Gui/ArtworkManager.cs
index c4af06a..c6abfa8 100644
--- a/src/Core/Banshee.ThickClient/Banshee.Collection.Gui/ArtworkManager.cs
+++ b/src/Core/Banshee.ThickClient/Banshee.Collection.Gui/ArtworkManager.cs
@@ -182,7 +182,18 @@ namespace Banshee.Collection.Gui
             if (orig_exists && size >= 10) {
                 try {
                     Pixbuf pixbuf = new Pixbuf (orig_path);
-                    Pixbuf scaled_pixbuf = pixbuf.ScaleSimple (size, size, Gdk.InterpType.Bilinear);
+
+                    // Make it square if width and height difference is within 20%
+                    const double max_ratio = 1.2;
+                    double ratio = (double)pixbuf.Height / pixbuf.Width;
+                    int width = size, height = size;
+                    if (ratio > max_ratio) {
+                        width = (int)Math.Round (size / ratio);
+                    }else if (ratio < 1d / max_ratio) {
+                        height = (int)Math.Round (size / ratio);
+                    }
+
+                    Pixbuf scaled_pixbuf = pixbuf.ScaleSimple (width, height, Gdk.InterpType.Bilinear);
 
                     if (IsCachedSize (size)) {
                         Directory.Create (System.IO.Path.GetDirectoryName (path));