public static void CachedDraw(this Cairo.Context self, ref SurfaceWrapper surface, Gdk.Rectangle region, object parameters = null, float opacity = 1.0f, Action <Cairo.Context, float> draw = null, double?forceScale = null) { double displayScale = forceScale.HasValue ? forceScale.Value : QuartzSurface.GetRetinaScale(self); int targetWidth = (int)(region.Width * displayScale); int targetHeight = (int)(region.Height * displayScale); bool redraw = false; if (surface == null || surface.Width != targetWidth || surface.Height != targetHeight) { if (surface != null) { surface.Dispose(); } surface = new SurfaceWrapper(self, targetWidth, targetHeight); redraw = true; } else if ((surface.Data == null && parameters != null) || (surface.Data != null && !surface.Data.Equals(parameters))) { redraw = true; } if (redraw) { surface.Data = parameters; using (var context = new Cairo.Context(surface.Surface)) { context.Operator = Operator.Clear; context.Paint(); context.Operator = Operator.Over; context.Save(); context.Scale(displayScale, displayScale); draw(context, 1.0f); context.Restore(); } } self.Save(); self.Translate(region.X, region.Y); self.Scale(1 / displayScale, 1 / displayScale); self.SetSourceSurface(surface.Surface, 0, 0); self.PaintWithAlpha(opacity); self.Restore(); }
public static void CachedDraw(this Cairo.Context self, ref SurfaceWrapper surface, Gdk.Rectangle region, object parameters = null, float opacity = 1.0f, Action<Cairo.Context, float> draw = null, double? forceScale = null) { double displayScale = forceScale.HasValue ? forceScale.Value : QuartzSurface.GetRetinaScale (self); int targetWidth = (int) (region.Width * displayScale); int targetHeight = (int) (region.Height * displayScale); bool redraw = false; if (surface == null || surface.Width != targetWidth || surface.Height != targetHeight) { if (surface != null) surface.Dispose (); surface = new SurfaceWrapper (self, targetWidth, targetHeight); redraw = true; } else if ((surface.Data == null && parameters != null) || (surface.Data != null && !surface.Data.Equals (parameters))) { redraw = true; } if (redraw) { surface.Data = parameters; using (var context = new Cairo.Context (surface.Surface)) { context.Operator = Operator.Clear; context.Paint(); context.Operator = Operator.Over; context.Save (); context.Scale (displayScale, displayScale); draw(context, 1.0f); context.Restore (); } } self.Save (); self.Translate (region.X, region.Y); self.Scale (1 / displayScale, 1 / displayScale); self.SetSourceSurface (surface.Surface, 0, 0); self.PaintWithAlpha (opacity); self.Restore (); }