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Viewing changes to external/xwt/Xwt.WPF/Xwt.WPFBackend/DrawingContext.cs

  • Committer: Package Import Robot
  • Author(s): Jo Shields
  • Date: 2013-05-12 09:46:03 UTC
  • mto: This revision was merged to the branch mainline in revision 29.
  • Revision ID: package-import@ubuntu.com-20130512094603-mad323bzcxvmcam0
Tags: upstream-4.0.5+dfsg
Import upstream version 4.0.5+dfsg

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external/xwt/Xwt.WPF/Xwt.WPFBackend/DrawingContext.cs
 
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// 
 
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// DrawingContext.cs
 
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//  
 
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// Author:
 
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//       Eric Maupin <ermau@xamarin.com>
 
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//       Lytico (http://limada.sourceforge.net)
 
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// 
 
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// Copyright (c) 2012 Xamarin, Inc.
 
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// 
 
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// Permission is hereby granted, free of charge, to any person obtaining a copy
 
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// of this software and associated documentation files (the "Software"), to deal
 
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// in the Software without restriction, including without limitation the rights
 
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 
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// copies of the Software, and to permit persons to whom the Software is
 
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// furnished to do so, subject to the following conditions:
 
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// 
 
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// The above copyright notice and this permission notice shall be included in
 
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// all copies or substantial portions of the Software.
 
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// 
 
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 
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// THE SOFTWARE.
 
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using System;
 
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using System.Collections.Generic;
 
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using System.Drawing;
 
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using System.Drawing.Drawing2D;
 
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namespace Xwt.WPFBackend
 
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{
 
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        internal class DrawingContext:IDisposable
 
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        {
 
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                internal DrawingContext (Graphics graphics)
 
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                {
 
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                        if (graphics == null)
 
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                                throw new ArgumentNullException ("graphics");
 
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                        graphics.SmoothingMode = SmoothingMode.None;
 
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                        graphics.PixelOffsetMode = PixelOffsetMode.Half;
 
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                        graphics.CompositingQuality = CompositingQuality.HighSpeed;
 
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                        // necessary for correct text rendering with System.Drawing
 
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                        //graphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.SingleBitPerPixelGridFit;
 
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                        // necessary for none-pixelated text drawing in images, revert to above line if it introduces a performance problem
 
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                        graphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;
 
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                        Graphics = graphics;
 
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                }
 
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                internal DrawingContext (DrawingContext context)
 
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                {
 
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                        context.CopyTo (this, false);
 
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                        CurrentX = context.CurrentX;
 
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                        CurrentY = context.CurrentY;
 
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                }
 
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                internal readonly Graphics Graphics;
 
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                Font font = null;
 
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                internal Font Font {
 
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                        get { return font ?? (font = new Font (FontFamily.GenericSansSerif, 12));}
 
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                        set { font = value;}
 
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                }
 
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                Color color = Color.Black;
 
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                float width = 1;
 
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                Pen pen = null;
 
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                internal Pen Pen {
 
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                        get { return pen ?? (pen = new Pen (color, width));}
 
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                        set { pen = value;}
 
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                }
 
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                Brush brush = null;
 
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                internal Brush Brush {
 
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                        get { return brush ?? (brush = new SolidBrush (color));}
 
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                        set { brush = value;}
 
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                }
 
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                internal GraphicsState State;
 
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                internal float CurrentX;
 
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                internal float CurrentY;
 
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                GraphicsPath path = null;
 
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                internal GraphicsPath Path {
 
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                        get { return path ?? (path = new GraphicsPath ());}
 
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                        set { path = value;}
 
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                }
 
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                internal void SetColor (Color color)
 
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                {
 
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                        if (this.color == color)
 
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                                return;
 
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                        if (pen != null)
 
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                                pen.Color = color;
 
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                        if (brush != null) {
 
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                                SolidBrush solidBrush = brush as SolidBrush;
 
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                                if (solidBrush == null) {
 
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                                        brush.Dispose ();
 
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                                        brush = null;
 
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                                } else
 
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                                        solidBrush.Color = color;
 
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                        }
 
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                        this.color = color;
 
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                }
 
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                internal void SetWidth (float width)
 
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                {
 
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                        if (this.width != width) {
 
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                                if (pen != null) {
 
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                                        pen.Width = width;
 
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                                }
 
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                        }
 
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                        this.width = width;
 
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                }
 
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                internal void CopyTo (DrawingContext dc, bool toCurrent)
 
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                {
 
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                        if (toCurrent) 
 
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                                dc.Graphics.Restore (this.State);
 
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                        else 
 
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                                dc.State = this.Graphics.Save ();
 
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                        dc.Font = this.font;
 
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                        dc.Brush = this.brush;
 
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                        dc.Pen = this.pen;
 
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                        dc.SetWidth (this.width);
 
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                        dc.SetColor (this.color);
 
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                        dc.CurrentX = this.CurrentX;
 
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                        dc.CurrentY = this.CurrentY;
 
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                        if (this.path != null && this.path.PointCount > 0)
 
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                                dc.Path = (GraphicsPath) this.path.Clone ();
 
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                }
 
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                internal void Save ()
 
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                {
 
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                        if (this.contexts == null)
 
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                                this.contexts = new Stack<DrawingContext> ();
 
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                        this.contexts.Push (new DrawingContext (this));
 
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                }
 
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                internal void Restore ()
 
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                {
 
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                        if (this.contexts == null || this.contexts.Count == 0)
 
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                                throw new InvalidOperationException ();
 
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                        var dc = this.contexts.Pop ();
 
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                        dc.CopyTo (this, true);
 
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                        dc.Dispose (true);
 
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                }
 
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                private Stack<DrawingContext> contexts;
 
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                public void Dispose (bool stacked)
 
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                {
 
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                        if (!stacked) {
 
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                                if (font != null)
 
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                                        font.Dispose ();
 
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                                if (brush != null)
 
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                                        brush.Dispose ();
 
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                                if (pen != null)
 
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                                        pen.Dispose ();
 
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                        }
 
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                        if (path != null)
 
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                                path.Dispose ();
 
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                        if (contexts != null)
 
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                                while (contexts.Count!=0) {
 
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                                        var c = contexts.Pop ();
 
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                                        c.Dispose (true);
 
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                                }
 
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                        font = null;
 
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                        brush = null;
 
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                        pen = null;
 
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                        path = null;
 
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                }
 
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                public void Dispose ()
 
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                {
 
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                        Dispose (false);
 
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                }
 
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        }
 
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}
 
 
b'\\ No newline at end of file'