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using System;
using System.Runtime.InteropServices;
using Cairo;
namespace Gdk
{
public class Context
{
private Context () {}
// Note: we don't need or want a .dll.config since we p/invoke
// the proper lib based on the os check below
// win32 only imports
[DllImport("libgdk-win32-2.0-0.dll")]
internal static extern IntPtr gdk_win32_hdc_get(IntPtr drawable, IntPtr gc, int usage);
[DllImport("libgdk-win32-2.0-0.dll")]
internal static extern void gdk_win32_hdc_release(IntPtr drawable,IntPtr gc,int usage);
// x11 only imports
[DllImport("libgdk-x11-2.0.so.0")]
internal static extern IntPtr gdk_x11_drawable_get_xdisplay (IntPtr handle);
[DllImport("libgdk-x11-2.0.so.0")]
internal static extern IntPtr gdk_drawable_get_visual (IntPtr handle);
[DllImport("libgdk-x11-2.0.so.0")]
internal static extern IntPtr gdk_x11_visual_get_xvisual (IntPtr handle);
[DllImport("libgdk-x11-2.0.so.0")]
internal static extern IntPtr gdk_x11_drawable_get_xid (IntPtr handle);
public static Cairo.Context CreateDrawable (Gdk.Drawable drawable)
{
return CreateDrawable (drawable, true);
}
public static Cairo.Context CreateDrawable (Gdk.Drawable drawable, bool double_buffered)
{
int x, y, w, h, d;
Cairo.Surface surface;
bool needs_xlate;
((Gdk.Window)drawable).GetGeometry(out x, out y, out w, out h, out d);
PlatformID os = Environment.OSVersion.Platform;
needs_xlate = drawable is Gdk.Window && double_buffered;
if (needs_xlate)
((Gdk.Window)drawable).GetInternalPaintInfo (out drawable, out x, out y);
if (os == PlatformID.Win32Windows || os == PlatformID.Win32NT ||
os == PlatformID.Win32S || os == PlatformID.WinCE) {
Gdk.GC gcc = new Gdk.GC (drawable);
IntPtr windc = gdk_win32_hdc_get (drawable.Handle, gcc.Handle, 0);
surface = new Win32Surface (windc);
if (double_buffered)
gdk_win32_hdc_release (drawable.Handle, gcc.Handle, 0);
} else {
IntPtr display = gdk_x11_drawable_get_xdisplay (drawable.Handle);
IntPtr visual = gdk_drawable_get_visual (drawable.Handle);
IntPtr xvisual = gdk_x11_visual_get_xvisual (visual);
IntPtr xdrawable = gdk_x11_drawable_get_xid (drawable.Handle);
surface = new XlibSurface (display, xdrawable, xvisual, w, h);
}
Cairo.Context ctx = new Cairo.Context (surface);
if (needs_xlate)
ctx.Translate (-(double) x, -(double) y);
return ctx;
}
}
}
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