Patch by Artur Wyszynski:

* Implemented BGradient, BGradientLinear, BGradientRadial,
  BGradientDiamond, BGradientConic and BGradientRadialFocus
  new Interface Kit classes.
* Implemented all the (AGG-based) backend necessary in
  the app_server to render gradients (Painter, DrawingEngine)
* app_server/View can convert a BGradient layout to screen
  coordinates.
* Added BGradient methods of the Fill* methods in BView.
* Implemented a test app and added it to the image as a
  demo.
* Adopted Icon-O-Matic and libs/icon in order to avoid
  clashing with the new BGradient class. Re-use some
  parts where possible.

Awesome work, Artur! Thanks a lot. Now a more modern
looking GUI has just become much easier to implement! :-)

TODO:
* Remove the need to have gradient type twice in the
  app_server protocol.
* Refactor some parts of the patch to remove duplicated
  code (Painter, DrawingEngine).
* Adopt the BPicture protocol to know about BGradients.
* Review some parts of the BArchivable implementation.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@28109 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/os/interface/GradientDiamond.h

@@ -0,0 +1,27 @@
+/*
+ * Copyright 2006-2008, Haiku.
+ * Distributed under the terms of the MIT License.
+ *
+ * Authors:
+ *		Artur Wyszynski <[email protected]>
+ */
+
+#ifndef GRADIENT_DIAMOND_H
+#define GRADIENT_DIAMOND_H
+
+#include <Gradient.h>
+
+class BPoint;
+
+class BGradientDiamond : public BGradient {
+public:
+	BGradientDiamond();
+	BGradientDiamond(const BPoint& center);
+	BGradientDiamond(float cx, float cy);
+	
+	BPoint Center() const;
+	void SetCenter(const BPoint& center);
+	void SetCenter(float cx, float cy);
+};
+
+#endif // GRADIENT_DIAMOND_H