1 files changed, 99 insertions, 0 deletions
diff --git a/Backends/CairoBackend/src/rsvg/SvgHandle.cs b/Backends/CairoBackend/src/rsvg/SvgHandle.cs
new file mode 100644
index 00000000..e767ce3a
--- /dev/null
+++ b/Backends/CairoBackend/src/rsvg/SvgHandle.cs
@@ -0,0 +1,99 @@
+//Copyright GPL2
+using System;
+using System.Runtime.InteropServices;
+using Drawing2D;
+
+namespace Crow.CairoBackend {
+
+
+	public sealed class SvgHandle : ISvgHandle {
+		const string lib = "rsvg-2.40";
+
+		public IntPtr Raw;
+
+		[DllImport (lib)]
+		static extern IntPtr rsvg_handle_new();
+		[DllImport (lib)]
+		static extern IntPtr rsvg_handle_new_from_data (byte[] data, UIntPtr n_data, out IntPtr error);
+		[DllImport (lib)]
+		static extern IntPtr rsvg_handle_new_from_file (string file_name, out IntPtr error);
+		[DllImport (lib)]
+		static extern IntPtr rsvg_handle_get_base_uri (IntPtr raw);
+		[DllImport (lib)]
+		static extern void rsvg_handle_set_dpi (IntPtr raw, double dpi);
+		[DllImport (lib)]
+		static extern void rsvg_handle_set_dpi_x_y (IntPtr raw, double dpi_x, double dpi_y);
+
+		[DllImport (lib)]
+		static extern void rsvg_handle_render_cairo (IntPtr raw, IntPtr cr);
+		[DllImport (lib)]
+		static extern void rsvg_handle_render_cairo_sub (IntPtr raw, IntPtr cr, string id);
+
+		[DllImport (lib)]
+		static extern void rsvg_handle_get_dimensions (IntPtr raw, IntPtr dimension_data);
+		[DllImport (lib)]
+		static extern bool rsvg_handle_close (IntPtr raw, out IntPtr error);
+		[DllImport (lib)]
+		static extern IntPtr rsvg_handle_get_title (IntPtr raw);
+		[DllImport (lib)]
+		static extern IntPtr rsvg_handle_get_metadata (IntPtr raw);
+
+		public SvgHandle ()
+		{
+			Raw = rsvg_handle_new();
+		}
+		public  SvgHandle (byte[] data)
+		{
+			Raw = rsvg_handle_new_from_data(data, new UIntPtr ((ulong) (data == null ? 0 : data.Length)), out IntPtr error);
+			if (error != IntPtr.Zero) throw new Exception (error.ToString());
+		}
+		public SvgHandle (string file_name)
+		{
+			Raw = rsvg_handle_new_from_file(file_name, out IntPtr error);
+			if (error != IntPtr.Zero) throw new Exception (error.ToString());
+		}
+
+
+		public double Dpi { set => rsvg_handle_set_dpi (Raw, value); }
+		public void SetDpiXY (double dpi_x, double dpi_y) => rsvg_handle_set_dpi_x_y (Raw, dpi_x, dpi_y);
+
+
+		public void Render(IContext cr) =>
+			rsvg_handle_render_cairo (Raw, cr == null ? IntPtr.Zero : (cr as Context).handle);
+
+		public void Render (IContext cr, string id) =>
+			rsvg_handle_render_cairo_sub (Raw, cr == null ? IntPtr.Zero : (cr as Context).handle, id);
+
+		[StructLayout(LayoutKind.Sequential)]
+		struct DimensionData {
+
+			public int Width;
+			public int Height;
+			public double Em;
+			public double Ex;
+
+			public static DimensionData Zero = new DimensionData ();
+
+			public static DimensionData New(IntPtr raw) {
+				if (raw == IntPtr.Zero)
+					return DimensionData.Zero;
+				return (DimensionData) Marshal.PtrToStructure (raw, typeof (DimensionData));
+			}
+		}
+		public Size Dimensions {
+			get {
+				DimensionData dimension_data;
+				IntPtr native_dimension_data = Marshal.AllocHGlobal (Marshal.SizeOf (typeof (DimensionData)));
+				rsvg_handle_get_dimensions(Raw, native_dimension_data);
+				dimension_data = DimensionData.New (native_dimension_data);
+				Marshal.FreeHGlobal (native_dimension_data);
+				return new Size (dimension_data.Width, dimension_data.Height);
+			}
+		}
+
+		public void Dispose() {
+			bool raw_ret = rsvg_handle_close(Raw, out IntPtr error);
+			if (error != IntPtr.Zero) throw new Exception (error.ToString());
+		}
+	}
+}