public Image Copy(ICanvas canvas, Area area)
{
Image img;
Pixmap pm;
global::Cairo.Context ctx;
var w = canvas.Widget;
NoWindowWidget widget = new NoWindowWidget {
Width = area.Width, Height = area.Height
};
canvas.SetWidget(widget);
pm = new Pixmap(null, (int)area.Width, (int)area.Height, 24);
ctx = Gdk.CairoHelper.Create(pm);
using (CairoContext c = new CairoContext(ctx)) {
ctx.Translate(-area.Start.X, -area.Start.Y);
canvas.Draw(c, null);
}
img = new Image(Pixbuf.FromDrawable(pm, Colormap.System, 0, 0, 0, 0,
(int)area.Width, (int)area.Height));
canvas.SetWidget(w);
return(img);
}
public Surface(int width, int height, Image image, bool warnOnDispose = true, bool useDeviceScaleFactor = true)
{
DeviceScaleFactor = 1;
this.warnOnDispose = warnOnDispose;
if (useDeviceScaleFactor)
{
if (image != null)
{
DeviceScaleFactor = image.DeviceScaleFactor;
}
else
{
DeviceScaleFactor = App.Current.GUIToolkit.DeviceScaleFactor;
}
}
surface = new ImageSurface(Format.ARGB32, (int)(width * DeviceScaleFactor), (int)(height * DeviceScaleFactor));
if (image != null)
{
using (CairoContext ccontext = new CairoContext(surface)) {
var oldContext = App.Current.DrawingToolkit.Context;
App.Current.DrawingToolkit.Context = ccontext;
// The image must be drawn using it's real size, since the backend ImageSurface's size is also scalled
App.Current.DrawingToolkit.DrawImage(new Core.Common.Point(0, 0), image.Width * DeviceScaleFactor,
image.Height * DeviceScaleFactor, image, ScaleMode.AspectFit);
App.Current.DrawingToolkit.Context = oldContext;
}
}
}
protected void Draw(Area area)
{
if (DrawEvent != null)
{
using (CairoContext c = new CairoContext(widget.GdkWindow)) {
global::Cairo.Context cc = c.Value as global::Cairo.Context;
if (area == null)
{
Rectangle r = widget.GdkWindow.ClipRegion.Clipbox;
area = new Area(new Point(r.X, r.Y), r.Width, r.Height);
}
cc.Rectangle(area.Start.X, area.Start.Y, area.Width, area.Height);
cc.Clip();
if (widget.WidgetFlags.HasFlag(WidgetFlags.NoWindow))
{
Rectangle widgetArea = WidgetArea;
cc.Translate(widgetArea.X, widgetArea.Y);
area.Start.X -= widgetArea.X;
area.Start.Y -= widgetArea.Y;
}
DrawEvent(c, area);
}
}
}