82 строки
2.7 KiB
C#
82 строки
2.7 KiB
C#
//
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// ImagePatternBackendHandler.cs
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//
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// Author:
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// Eric Maupin <ermau@xamarin.com>
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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 Xwt.Backends;
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using System.Windows.Media;
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namespace Xwt.WPFBackend
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{
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public class WpfImagePatternBackendHandler
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: ImagePatternBackendHandler
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{
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public override object Create (ImageDescription img)
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{
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return new ImagePattern (ApplicationContext, img);
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}
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public override void Dispose (object img)
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{
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}
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}
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class ImagePattern
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{
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ApplicationContext actx;
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ImageDescription image;
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double scaleFactor;
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ImageBrush brush;
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public ImagePattern (ApplicationContext actx, ImageDescription im)
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{
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this.actx = actx;
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this.image = im;
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}
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public ImageBrush GetBrush (double scaleFactor)
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{
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if (brush == null || scaleFactor != this.scaleFactor)
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{
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this.scaleFactor = scaleFactor;
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var ib = (WpfImage)image.Backend;
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var bmp = ib.GetBestFrame(actx, scaleFactor, image.Size.Width, image.Size.Height, false);
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brush = new ImageBrush(bmp)
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{
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TileMode = TileMode.Tile,
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ViewportUnits = BrushMappingMode.Absolute,
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AlignmentY = System.Windows.Media.AlignmentY.Top,
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AlignmentX = System.Windows.Media.AlignmentX.Left,
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Stretch = System.Windows.Media.Stretch.None,
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Viewport = new System.Windows.Rect(0, 0, bmp.Width, bmp.Height),
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Opacity = image.Alpha
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};
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brush.RelativeTransform = new ScaleTransform(image.Size.Width / bmp.Width, image.Size.Height / bmp.Height);
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}
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return brush;
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}
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}
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}
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