[f-spot] New BWEditor extension

[Stephane Delcroix <sdelcroix src gnome org>]

commit 04375b12ba722abe97fdb177492181adaa7bad64
Author: Stephane Delcroix <stephane delcroix org>
Date:   Wed Sep 16 16:32:20 2009 +0200

    New BWEditor extension
    
    This extension allow converting images to BW with control ov er the channels and curve.

 extensions/Editors/BWEditor/BWEditor.addin.xml |   15 +++
 extensions/Editors/BWEditor/BWEditor.cs        |  126 ++++++++++++++++++++++++
 extensions/Editors/BWEditor/Makefile           |   30 ++++++
 3 files changed, 171 insertions(+), 0 deletions(-)
---
diff --git a/extensions/Editors/BWEditor/BWEditor.addin.xml b/extensions/Editors/BWEditor/BWEditor.addin.xml
new file mode 100644
index 0000000..e3d6791
--- /dev/null
+++ b/extensions/Editors/BWEditor/BWEditor.addin.xml
@@ -0,0 +1,15 @@
+<Addin namespace="FSpot"
+	id="BWEditor"
+	version="0.6.0.0"
+	name="BWEditor"
+	description="Convert to B/W with control. Require Mono 2.2."
+	author="Stephane Delcroix"
+	url="http://f-spot.org/Extensions";
+	category="Editors">
+	<Dependencies>
+		<Addin id="Core" version="0.6"/>
+	</Dependencies>
+	<Extension path = "/FSpot/Editors">
+		<Editor editor_type = "BWEditor.BWEditor"/>
+	</Extension>
+</Addin>
diff --git a/extensions/Editors/BWEditor/BWEditor.cs b/extensions/Editors/BWEditor/BWEditor.cs
new file mode 100644
index 0000000..bd4dcda
--- /dev/null
+++ b/extensions/Editors/BWEditor/BWEditor.cs
@@ -0,0 +1,126 @@
+/*
+ * BWEditor.cs
+ *
+ * Author(s)
+ * 	Stephane Delcroix  (stephane delcroix org)
+ *
+ * Copyright (c) 2009 Novell, Inc.
+ *
+ * This is open source software. See COPYING for details.
+ */
+
+using System;
+using FSpot;
+using FSpot.Editors;
+using Gtk;
+using Gdk;
+using Mono.Unix;
+using Mono.Simd;
+
+namespace BWEditor {
+	class BWEditor : Editor {
+		public BWEditor () : base (Catalog.GetString ("Convert to B/W"), null) {
+			CanHandleMultiple = false;
+			HasSettings = true;
+			ApplyLabel = Catalog.GetString ("Apply");
+		}
+
+		static bool enhanced_support = EnhancedSimdSupport ();
+		static bool EnhancedSimdSupport () { //require sse3
+			return SimdRuntime.IsMethodAccelerated (typeof (VectorOperations), "HorizontalAdd", new Type[] {typeof (Vector4f), typeof (Vector4f)})
+			       && SimdRuntime.IsMethodAccelerated (typeof (Vector4f), "op_Multiply");
+		}
+
+		protected override Pixbuf Process (Pixbuf input, Cms.Profile input_profile)
+		{
+			uint timer = FSpot.Utils.Log.DebugTimerStart ();
+			if (input.BitsPerSample != 8) {
+				FSpot.Utils.Log.Warning ("unsupported pixbuf format");
+				return (Pixbuf)input.Clone ();
+			}
+			Pixbuf output = new Pixbuf (input.Colorspace, input.HasAlpha, input.BitsPerSample, input.Width, input.Height);
+			Vector4f multiply = new Vector4f ((float)(r.Value/100.0), (float)(g.Value/100.0), (float)(b.Value/100.0), 0);
+			Normalize (ref multiply);
+
+			bool has_alpha = input.HasAlpha;
+			int chan = input.NChannels;
+			int rowstride_in = input.Rowstride;
+			int rowstride_out = output.Rowstride;
+			Vector4f v_in;
+			Vector4f v_out = new Vector4f (0);
+			float[] fcurve = new float [256];
+			c.GetVector (fcurve.Length, fcurve);
+			byte[] curve = new byte [fcurve.Length];
+			for (int i = 0; i < fcurve.Length; i++)
+				curve[i] = (byte)fcurve[i];
+			unsafe {
+				byte *pix_in = (byte *)input.Pixels;
+				byte *pix_out = (byte *)output.Pixels;
+				for (int i=0; i < input.Height; i++)
+					for (int j=0; j<input.Width; j++) {
+						v_in = new Vector4f (pix_in[i*rowstride_in + j*chan],
+								     pix_in[i*rowstride_in + j*chan + 1],
+								     pix_in[i*rowstride_in + j*chan + 2],
+								     0);
+						Desaturate (ref v_in, ref multiply, ref v_out);
+						pix_out[i*rowstride_out + j*chan] = curve [unchecked ((byte)v_out.X)];
+						pix_out[i*rowstride_out + j*chan + 1] = curve [unchecked ((byte)v_out.Y)];
+						pix_out[i*rowstride_out + j*chan + 2] = curve [unchecked ((byte)v_out.Z)];
+						if (has_alpha)
+							pix_out[i*rowstride_out + j*chan + 3] = pix_in[i*rowstride_in + j*chan + 3];
+					}
+			}
+			FSpot.Utils.Log.DebugTimerPrint (timer, "Processing took {0}");
+			return output;
+		}
+
+		static void Desaturate (ref Vector4f input, ref Vector4f chan_multiplier, ref Vector4f output)
+		{
+			Vector4f temp = input * chan_multiplier;	//(r1,g1,b1,0) = (r,g,b,a) * (rx, gx, bx, 0)
+			temp = temp.HorizontalAdd (temp);		//(r1+g1, b1+0, r1+g1, b1+0)
+			output = temp.HorizontalAdd (temp);		//(r1+g1+b1+0, r1+g1+b1+0, ..., ...)
+		}
+
+		static void Normalize (ref Vector4f v)
+		{
+			float sum = v.X + v.Y + v.Z;
+			v /= new Vector4f (sum);
+		}
+
+		HScale r, g, b;
+		Curve c;
+
+		public override Widget ConfigurationWidget ()
+		{
+			VBox h = new VBox ();
+			r = new HScale (0, 100, 1);
+			r.ModifyBg (StateType.Selected, new Color (0xff, 0, 0));
+			r.Value = 80;
+			r.ValueChanged += SettingsChanged;
+			h.Add (r);
+			g = new HScale (0, 100, 1);
+			g.ModifyBg (StateType.Selected, new Color (0, 0xff, 0));
+			g.Value = 10;
+			g.ValueChanged += SettingsChanged;
+			h.Add (g);
+			b = new HScale (0, 100, 1);
+			b.ModifyBg (StateType.Selected, new Color (0, 0, 0xff));
+			b.Value = 10;
+			b.ValueChanged += SettingsChanged;
+			h.Add (b);
+			c = new Curve ();
+			c.CurveType = CurveType.Spline;
+			c.SetRange (0, 255, 0, 255);
+			h.Add (c);
+			Button btn = new Button (Gtk.Stock.Refresh);
+			btn.Clicked += delegate {UpdatePreview ();};
+			h.Add (btn);
+			return h;
+		}
+
+		void SettingsChanged (object sender, EventArgs e)
+		{
+			UpdatePreview ();
+		}
+	}
+}
diff --git a/extensions/Editors/BWEditor/Makefile b/extensions/Editors/BWEditor/Makefile
new file mode 100644
index 0000000..629472b
--- /dev/null
+++ b/extensions/Editors/BWEditor/Makefile
@@ -0,0 +1,30 @@
+all: BWEditor.dll
+
+PACKAGES = \
+	-pkg:f-spot \
+	-pkg:gtk-sharp-2.0
+
+ASSEMBLIES = \
+	-r:Mono.Posix	\
+	-r:Mono.Simd
+
+RESOURCES = \
+	-resource:BWEditor.addin.xml
+
+SOURCES = \
+	BWEditor.cs
+
+install: all
+	cp *.dll ~/.config/f-spot/addins/
+
+mpack: BWEditor.dll
+	mautil p BWEditor.dll
+
+BWEditor.dll: $(SOURCES) BWEditor.addin.xml
+	gmcs -target:library -unsafe $(SOURCES) $(PACKAGES) $(ASSEMBLIES) $(RESOURCES)
+
+clean:
+	rm -f *.dll *~ *.bak .mpack
+
+PHONY:
+	install clean all mpack