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[glabels/vala] Initial vala implementation of IEC16022 backend.

commit 8c591d529ef34af02d1dbe1926d407be8540cec3
Author: Jim Evins <evins snaught com>
Date:   Thu Sep 27 23:32:19 2012 -0400

    Initial vala implementation of IEC16022 backend.

 configure.ac                              |   49 ++++++++++
 glabels/Makefile.am                       |    5 +
 glabels/barcode_backends.vala             |    2 +
 glabels/barcode_backends/iec16022.vala    |  140 +++++++++++++++++++++++++++++
 glabels/barcode_backends/libiec16022.vapi |   21 +++++
 5 files changed, 217 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index f8a56c4..a8b96d4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -69,6 +69,7 @@ AC_SUBST(CFLAGS)
 AC_SUBST(CPPFLAGS)
 AC_SUBST(LDFLAGS)
 
+dnl Required dependencies
 GLIB_REQUIRED=2.28.0
 GTK_REQUIRED=3.0.9
 LIBXML_REQUIRED=2.7.8
@@ -78,6 +79,31 @@ GDK_PIXBUF_REQUIRED=2.24.0
 LIBRSVG_REQUIRED=2.36.0
 PANGOCAIRO_REQUIRED=1.30.0
 
+dnl Optional dependencies
+LIBEBOOK_REQUIRED=2.30.3
+LIBBARCODE_REQUIRED=0.98
+LIBQRENCODE_REQUIRED=3.1.0
+LIBIEC16022_REQUIRED=0.2.4
+LIBZINT_REQUIRED=2.4.0
+
+dnl Make above strings available for packaging files (e.g. rpm spec files)
+AC_SUBST(GLIB_REQUIRED)
+AC_SUBST(GTK_REQUIRED)
+AC_SUBST(LIBXML_REQUIRED)
+AC_SUBST(GEE_REQUIRED)
+AC_SUBST(LIBRSVG_REQUIRED)
+AC_SUBST(CAIRO_REQUIRED)
+AC_SUBST(PANGO_REQUIRED)
+AC_SUBST(GDK_PIXBUF_REQUIRED)
+AC_SUBST(LIBRSVG_REQUIRED)
+AC_SUBST(PANGOCAIRO_REQUIRED)
+AC_SUBST(LIBEBOOK_REQUIRED)
+AC_SUBST(LIBBARCODE_REQUIRED)
+AC_SUBST(LIBQRENCODE_REQUIRED)
+AC_SUBST(LIBIEC16022_REQUIRED)
+AC_SUBST(LIBZINT_REQUIRED)
+
+
 PKG_CHECK_MODULES(GLABELS, [\
 			   glib-2.0 >= $GLIB_REQUIRED \
 			   gobject-2.0 >= $GLIB_REQUIRED \
@@ -137,6 +163,28 @@ else
 fi
 
 
+dnl ---------------------------------------------------------------------------
+dnl - Check for IEC16022 Barcode backend
+dnl ---------------------------------------------------------------------------
+AC_ARG_WITH(libiec16022,
+	    [AS_HELP_STRING([--without-libiec16022],[build without IEC 16022 support])])
+have_libiec16022=no
+if test "x$with_libiec16022" != xno; then
+	PKG_CHECK_MODULES(LIBIEC16022, libiec16022 >= $LIBIEC16022_REQUIRED,
+			  [have_libiec16022=yes], [have_libiec16022=no])
+fi
+
+if test "x$have_libiec16022" = "xyes"; then
+	AC_DEFINE(HAVE_LIBIEC16022,1,[Define to 1 for IEC 16022 support])
+	LIBIEC16022_VALAFLAGS="-D HAVE_LIBIEC16022"
+	AC_SUBST(LIBIEC16022_VALAFLAGS)
+	AC_SUBST(LIBIEC16022_CFLAGS)
+	AC_SUBST(LIBIEC16022_LIBS)
+else
+	help_libiec16022="(See http://datenfreihafen.org/projects/iec16022.html)"
+fi
+
+
 AC_CONFIG_FILES([Makefile
 	vapi/Makefile
 	libglabels/Makefile
@@ -179,5 +227,6 @@ Configuration:
 Optional barcode backends:
 
         GNU Barcode ............. ${have_libbarcode} ${help_libbarcode}
+        IEC 16022 ............... ${have_libiec16022} ${help_libiec16022}
 
 "
diff --git a/glabels/Makefile.am b/glabels/Makefile.am
index 10d8340..8ddc3ce 100644
--- a/glabels/Makefile.am
+++ b/glabels/Makefile.am
@@ -11,7 +11,9 @@ glabels_4_SOURCES = \
 	glabels.vala \
 	barcode_backends.vala \
 	barcode_backends/gnu_barcode.vala \
+	barcode_backends/iec16022.vala \
 	barcode_backends/libbarcode.vapi \
+	barcode_backends/libiec16022.vapi \
 	barcode_menu.vala \
 	barcode_menu_button.vala \
 	barcode_menu_item.vala \
@@ -94,6 +96,7 @@ INCLUDES = \
 	-DDATADIR=\""$(datadir)"\" \
 	-DGLABELS_BRANCH=\""$(GLABELS_BRANCH)"\" \
 	$(LIBBARCODE_CFLAGS) \
+	$(LIBIEC16022_CFLAGS) \
 	$(NULL)
 
 VALAFLAGS = \
@@ -109,6 +112,7 @@ VALAFLAGS = \
 	--pkg libglabels-4 \
 	--pkg libglbarcode-4 \
 	$(LIBBARCODE_VALAFLAGS) \
+	$(LIBIEC16022_VALAFLAGS) \
 	$(NULL)
 
 
@@ -117,6 +121,7 @@ glabels_4_LDADD = \
 	-L../libglbarcode -lglbarcode-4.0 \
 	$(GLABELS_LIBS) \
 	$(LIBBARCODE_LIBS) \
+	$(LIBIEC16022_LIBS) \
 	$(NULL)
 
 
diff --git a/glabels/barcode_backends.vala b/glabels/barcode_backends.vala
index d0d5367..7c3ed98 100644
--- a/glabels/barcode_backends.vala
+++ b/glabels/barcode_backends.vala
@@ -396,6 +396,8 @@ namespace glabels
 
 			register_backend( "iec16022", _("IEC16022") );
 
+			glbarcode.Factory.register_type( "iec16022:IEC16022", typeof(BackendIec16022.Datamatrix) );
+
 			register_style( "iec16022:IEC16022", "iec16022", _("DataMatrix"),
 			                false, false, true, false, "12345678", true, 8 );
 
diff --git a/glabels/barcode_backends/iec16022.vala b/glabels/barcode_backends/iec16022.vala
new file mode 100644
index 0000000..1ebf9a8
--- /dev/null
+++ b/glabels/barcode_backends/iec16022.vala
@@ -0,0 +1,140 @@
+/*  iec16022.vala
+ *
+ *  Copyright (C) 2012  Jim Evins <evins snaught com>
+ *
+ *  This file is part of libglbarcode.
+ *
+ *  libglabels is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Lesser General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  libglabels is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public License
+ *  along with libglabels.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+#if HAVE_LIBIEC16022
+
+using GLib;
+using glbarcode.Constants;
+
+namespace glabels
+{
+
+	namespace BackendIec16022
+	{
+
+		/**
+		 * Datamatrix Barcode
+		 */
+		public class Datamatrix : glbarcode.Barcode
+		{
+
+			private const double MIN_PIXEL_SIZE = 1.0;
+
+
+			/**
+			 * Datamatrix Barcode data validation method
+			 */
+			protected override bool validate( string data )
+			{
+				if ( (data.length == 0) || (data.length > iec16022.MAXBARCODE ) )
+				{
+					return false;
+				}
+
+				for ( int i = 0; i < data.length; i++ )
+				{
+					if ( (data[i] & 0x80) != 0 )
+					{
+						return false;
+					}
+				}
+
+				return true;
+			}
+
+
+			/**
+			 * Datamatrix Barcode encoding method
+			 */
+			protected override string encode( string data )
+			{
+				return ""; /* Actual encoding done in vectorize. */
+			}
+
+
+			/**
+			 * Datamatrix Barcode vectorization method
+			 */
+			protected override void vectorize( string coded_data, string data, string text )
+			{
+				/*
+				 * First encode using IEC16022 Barcode library.
+				 */
+				int i_width  = 0;
+				int i_height = 0;
+
+				char[] grid = iec16022.ecc200( ref i_width, ref i_height, null,
+				                               data.length, data,
+				                               null, null, null );
+
+				/*
+				 * Now do the actual vectorization.
+				 */
+
+				/* Treat requested size as a bounding box, scale to maintain aspect
+				 * ratio while fitting it in this bounding box. */
+				double aspect_ratio = (double)i_height / (double)i_width;
+				if ( h > w*aspect_ratio )
+				{
+					h = w * aspect_ratio;
+				}
+				else
+				{
+					w = h / aspect_ratio;
+				}
+
+				/* Now determine pixel size. */
+				double pixel_size = w / i_width;
+				if ( pixel_size < MIN_PIXEL_SIZE )
+				{
+					pixel_size = MIN_PIXEL_SIZE;
+				}
+
+				/* Now traverse the code string and create a list of boxes */
+				for ( int iy = i_height-1, i = 0; iy >= 0; iy-- )
+				{
+
+					for ( int ix = 0; ix < i_width; ix++, i++ )
+					{
+
+						if ( grid[i] != 0 )
+						{
+							add_box( ix*pixel_size, iy*pixel_size, pixel_size, pixel_size );
+						}
+
+					}
+
+				}
+
+				/* Fill in other info */
+				w = i_width  * pixel_size;
+				h = i_height * pixel_size;
+
+			}
+
+
+		}
+
+	}
+
+}
+
+#endif
diff --git a/glabels/barcode_backends/libiec16022.vapi b/glabels/barcode_backends/libiec16022.vapi
new file mode 100644
index 0000000..35a869a
--- /dev/null
+++ b/glabels/barcode_backends/libiec16022.vapi
@@ -0,0 +1,21 @@
+
+/*
+ * Minimal VAPI file for LIBIEC16022 Barcode library.
+ */
+
+#if HAVE_LIBIEC16022
+
+namespace iec16022
+{
+
+	[CCode (cheader_filename = "iec16022ecc200.h", cname = "iec16022ecc200", array_length = false)]
+	public char[] ecc200( ref int iw, ref int ih, char** encoding,
+	                      int len, string data,
+	                      int* lenp, int* maxp, int* eccp );
+
+	[CCode (cheader_filename = "iec16022ecc200.h", cname = "MAXBARCODE")]
+	public const int MAXBARCODE;
+
+}
+
+#endif
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