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TiltEditor.cs

/*
 * TiltEditor.cs
 *
 * Author(s)
 *    Ruben Vermeersch <ruben@savanne.be>
 *
 * This is free software. See COPYING for details.
 */

using Cairo;

using FSpot.Widgets;

using Gdk;
using Gtk;

using Mono.Unix;

using System;

namespace FSpot.Editors {
      // TODO: there were keybindings (left/right) to adjust tilt, maybe they should be added back.
      class TiltEditor : Editor
      {
            double angle;
            Scale scale;

            public TiltEditor () : base (Catalog.GetString ("Straighten"), "align-horizon") {
                  // FIXME: need tooltip Catalog.GetString ("Adjust the angle of the image to straighten the horizon")
                  HasSettings = true;
        }

            public override Widget ConfigurationWidget ()
            {
                  scale = new HScale (-45, 45, 1);
                  scale.Value = 0.0;
                  scale.ValueChanged += HandleValueChanged;
                  return scale;
            }


            protected override Pixbuf Process (Pixbuf input, Cms.Profile input_profile) {
                  return ProcessImpl (input, input_profile, false);
            }

            protected override Pixbuf ProcessFast (Pixbuf input, Cms.Profile input_profile)
            {
                  return ProcessImpl (input, input_profile, true);
            }


            private Pixbuf ProcessImpl (Pixbuf input, Cms.Profile input_profile, bool fast) {
                  Pixbuf result;
                  using (ImageInfo info = new ImageInfo (input)) {
                        MemorySurface surface = new MemorySurface (Format.Argb32,
                                                         input.Width,
                                                         input.Height);

                        Context ctx = new Context (surface);
                        ctx.Matrix = info.Fill (info.Bounds, angle);
                        SurfacePattern p = new SurfacePattern (info.Surface);
                        if (fast) {
                              p.Filter =  Filter.Fast;
                        }
                        ctx.Source = p;
                        ctx.Paint ();
                        ((IDisposable)ctx).Dispose ();
                        p.Destroy ();
                        result = MemorySurface.CreatePixbuf (surface);
                        surface.Flush ();
                  }
                  return result;
            }

            private void HandleValueChanged (object sender, System.EventArgs args)
            {
                  angle = scale.Value * Math.PI / 180;
                  UpdatePreview ();
            }
      }
}

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