C# Cairo.Context.Scale方法代码示例

		private void UpdateThumbnail ()
		{
			double scalex = (double)Allocation.Width / (double)PintaCore.Workspace.ImageSize.Width;
			double scaley = (double)Allocation.Height / (double)PintaCore.Workspace.ImageSize.Height;
			
			thumbnail = new Cairo.ImageSurface (Cairo.Format.Argb32, Allocation.Width, Allocation.Height);
			
			using (Cairo.Context g = new Cairo.Context (thumbnail)) {
				g.Scale (scalex, scaley);
				foreach (Layer layer in PintaCore.Layers.GetLayersToPaint ()) {
					layer.Draw(g);
				}
			}
		}

 public Cairo.Pattern GetPattern(ApplicationContext actx, double scaleFactor)
 {
     if (pattern == null || currentScaleFactor != scaleFactor) {
         if (pattern != null)
             pattern.Dispose ();
         Gdk.Pixbuf pb = ((GtkImage)Image.Backend).GetBestFrame (actx, scaleFactor, Image.Size.Width, Image.Size.Height, false);
         var imgs = new Cairo.ImageSurface (Cairo.Format.ARGB32, (int)(Image.Size.Width * scaleFactor), (int)(Image.Size.Height * scaleFactor));
         var ic = new Cairo.Context (imgs);
         ic.Scale ((double)imgs.Width / (double)pb.Width, (double)imgs.Height / (double)pb.Height);
         Gdk.CairoHelper.SetSourcePixbuf (ic, pb, 0, 0);
         ic.Paint ();
         imgs.Flush ();
         ((IDisposable)ic).Dispose ();
         pattern = new Cairo.SurfacePattern (imgs);
         pattern.Extend = Cairo.Extend.Repeat;
         var cm = new Cairo.Matrix ();
         cm.Scale (scaleFactor, scaleFactor);
         pattern.Matrix = cm;
         currentScaleFactor = scaleFactor;
     }
     return pattern;
 }

				public BgBufferUpdate (Minimpap mode)
				{
					this.mode = mode;
					
					cr = Gdk.CairoHelper.Create (mode.backgroundBuffer);
					
					cr.LineWidth = 1;
					int w = mode.backgroundBuffer.ClipRegion.Clipbox.Width;
					int h = mode.backgroundBuffer.ClipRegion.Clipbox.Height;
					cr.Rectangle (0, 0, w, h);
					if (mode.TextEditor.ColorStyle != null)
						cr.Color = mode.TextEditor.ColorStyle.Default.CairoBackgroundColor;
					cr.Fill ();
					
					maxLine = mode.TextEditor.GetTextEditorData ().VisibleLineCount;
					sx = w / (double)mode.TextEditor.Allocation.Width;
					sy = Math.Min (1, lineHeight * maxLine / (double)mode.TextEditor.GetTextEditorData ().TotalHeight );
					cr.Scale (sx, sy);
					
					handler = GLib.Idle.Add (BgBufferUpdater);
				}

		void OnDraw (object data)
		{
			Action<Cairo.Context> callback = (Action<Cairo.Context>) data;

			using (var context = new Cairo.Context (surface.Surface)) {
				context.Operator = Cairo.Operator.Source;
				context.SetSourceRGBA (0, 0, 0, 0);
				context.Paint ();
				context.Operator = Cairo.Operator.Over;

				context.Scale (Scale, Scale);
				callback (context);
			}
			runningSignal.Set ();
		}

		Gdk.Pixbuf RenderFrame (ApplicationContext actx, double scaleFactor, double width, double height)
		{
			var swidth = Math.Max ((int)(width * scaleFactor), 1);
			var sheight = Math.Max ((int)(height * scaleFactor), 1);

			using (var sf = new Cairo.ImageSurface (Cairo.Format.ARGB32, swidth, sheight))
			using (var ctx = new Cairo.Context (sf)) {
				ImageDescription idesc = new ImageDescription () {
					Alpha = 1,
					Size = new Size (width, height)
				};
				ctx.Scale (scaleFactor, scaleFactor);
				Draw (actx, ctx, scaleFactor, 0, 0, idesc);
				var f = new ImageFrame (ImageBuilderBackend.CreatePixbuf (sf), Math.Max((int)width,1), Math.Max((int)height,1), true);
				AddFrame (f);
				return f.Pixbuf;
			}
		}

        private void UpdateThumbnail()
        {
            double scalex = (double)Allocation.Width / (double)PintaCore.Workspace.ImageSize.Width;
            double scaley = (double)Allocation.Height / (double)PintaCore.Workspace.ImageSize.Height;

            thumbnail = new Cairo.ImageSurface (Cairo.Format.Argb32, Allocation.Width, Allocation.Height);

            using (Cairo.Context g = new Cairo.Context (thumbnail)) {
                g.Scale (scalex, scaley);
                foreach (Layer layer in PintaCore.Layers.GetLayersToPaint ()) {
                    g.SetSourceSurface (layer.Surface, (int)layer.Offset.X, (int)layer.Offset.Y);
                    g.PaintWithAlpha (layer.Opacity);
                }
            }
        }

        Gdk.Pixbuf RenderFrame(ApplicationContext actx, double scaleFactor, ImageDescription idesc)
        {
            var swidth = Math.Max ((int)(idesc.Size.Width * scaleFactor), 1);
            var sheight = Math.Max ((int)(idesc.Size.Height * scaleFactor), 1);

            using (var sf = new Cairo.ImageSurface (Cairo.Format.ARGB32, swidth, sheight))
            using (var ctx = new Cairo.Context (sf)) {
                ctx.Scale (scaleFactor, scaleFactor);
                Draw (actx, ctx, scaleFactor, 0, 0, idesc);
                var f = new ImageFrame (ImageBuilderBackend.CreatePixbuf (sf), Math.Max ((int)idesc.Size.Width, 1), Math.Max ((int)idesc.Size.Height, 1), true);
                if (drawCallback == null)
                    AddFrame (f);
                return f.Pixbuf;
            }
        }