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//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());
}
}
}
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