Add a 'Stamp' widget.

Place one or multiple stamps on scanned pages in defined locations.

A stamp is understood here as
 - a transparent text in a transparent frame with no borders
 - an opaque text on an opaque background with no borders.

Stamp parameters:
 - text
 - font
 - foreground colour
 - background colour
 - angle of rotation
 - transparency.

Locations:
 - centre
 - cardinal directions
 - inter-cardinal directions.

Resources/StampWidget/StampWorker.h

@@ -0,0 +1,38 @@
+// /*
+//  * File:   StampWorker.h
+//  * Author: Saleem Edah-Tally - nmset@yandex.com
+//  * License : CeCILL-C
+//  * Copyright Saleem Edah-Tally - © 2025
+//  *
+//  * Created on 02 07 2025, 21:23
+//  */
+
+#ifndef STAMPWORKER_H
+#define STAMPWORKER_H
+
+#include <wx/wx.h>
+#include "DefsStampWidget.h"
+
+struct StampDescriptor;
+
+/**
+ * A stamp is understood here as\n
+ *  - a transparent text in a transparent frame with no borders\n
+ *  - an opaque text on an opaque background with no borders.\n
+ * 
+ * The text may be rotated. Actually, an initial image with the text is rotated
+ * and its new orthogonal bounds accepted (fortunately, we don't have to compute
+ * that).\n
+ * The font point size is rescaled to match the scan resolution. If the
+ * scanResolution parameter is invalid (<=0), the font is not rescaled.
+ */
+class StampWorker
+{
+  DECLARE_DYNAMIC_CLASS( StampWorker )
+public:
+  static wxImage CreateStamp(StampDescriptor * descriptor, int scanResolution = -1);
+  static void StampBackground(wxImage& background, const wxImage& stamp, int location = CENTRE);
+
+};
+
+#endif // STAMPWORKER_H