Steven Kirk
11 years ago
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// Copyright (c) The Perspex Project. All rights reserved.
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// Licensed under the MIT license. See licence.md file in the project root for full license information.
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using System; |
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using Cairo; |
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using Perspex.Cairo.Media.Imaging; |
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using Perspex.Layout; |
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using Perspex.Media; |
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using Perspex.Platform; |
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namespace Perspex.Cairo.Media |
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{ |
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internal static class TileBrushes |
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{ |
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public static SurfacePattern CreateImageBrush(ImageBrush brush, Size targetSize) |
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{ |
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if (brush.Source == null) |
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{ |
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return null; |
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} |
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// TODO: This is directly ported from Direct2D and could probably be made more
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// efficient on cairo by taking advantage of the fact that cairo has Extend.None.
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var image = ((BitmapImpl)brush.Source.PlatformImpl).Surface; |
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var imageSize = new Size(brush.Source.PixelWidth, brush.Source.PixelHeight); |
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var tileMode = brush.TileMode; |
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var sourceRect = brush.SourceRect.ToPixels(imageSize); |
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var destinationRect = brush.DestinationRect.ToPixels(targetSize); |
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var scale = brush.Stretch.CalculateScaling(destinationRect.Size, sourceRect.Size); |
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var translate = CalculateTranslate(brush, sourceRect, destinationRect, scale); |
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var intermediateSize = CalculateIntermediateSize(tileMode, targetSize, destinationRect.Size); |
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var intermediate = new ImageSurface(Format.ARGB32, (int)intermediateSize.Width, (int)intermediateSize.Height); |
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using (var context = new Context(intermediate)) |
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{ |
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Rect drawRect; |
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var transform = CalculateIntermediateTransform( |
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tileMode, |
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sourceRect, |
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destinationRect, |
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scale, |
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translate, |
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out drawRect); |
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context.Rectangle(drawRect.ToCairo()); |
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context.Clip(); |
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context.Transform(transform.ToCairo()); |
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Gdk.CairoHelper.SetSourcePixbuf(context, image, 0, 0); |
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context.Rectangle(0, 0, imageSize.Width, imageSize.Height); |
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context.Fill(); |
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var result = new SurfacePattern(intermediate); |
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if ((brush.TileMode & TileMode.FlipXY) != 0) |
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{ |
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// TODO: Currently always FlipXY as that's all cairo supports natively.
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// Support separate FlipX and FlipY by drawing flipped images to intermediate
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// surface.
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result.Extend = Extend.Reflect; |
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} |
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else |
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{ |
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result.Extend = Extend.Repeat; |
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} |
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if (brush.TileMode != TileMode.None) |
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{ |
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var matrix = result.Matrix; |
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matrix.InitTranslate(-destinationRect.X, -destinationRect.Y); |
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result.Matrix = matrix; |
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} |
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return result; |
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} |
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} |
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public static SurfacePattern CreateVisualBrush(VisualBrush brush, Size targetSize) |
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{ |
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var visual = brush.Visual; |
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if (visual == null) |
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{ |
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return null; |
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} |
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var layoutable = visual as ILayoutable; |
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if (layoutable?.IsArrangeValid == false) |
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{ |
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layoutable.Measure(Size.Infinity); |
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layoutable.Arrange(new Rect(layoutable.DesiredSize)); |
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} |
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// TODO: This is directly ported from Direct2D and could probably be made more
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// efficient on cairo by taking advantage of the fact that cairo has Extend.None.
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var tileMode = brush.TileMode; |
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var sourceRect = brush.SourceRect.ToPixels(layoutable.Bounds.Size); |
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var destinationRect = brush.DestinationRect.ToPixels(targetSize); |
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var scale = brush.Stretch.CalculateScaling(destinationRect.Size, sourceRect.Size); |
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var translate = CalculateTranslate(brush, sourceRect, destinationRect, scale); |
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var intermediateSize = CalculateIntermediateSize(tileMode, targetSize, destinationRect.Size); |
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var intermediate = new ImageSurface(Format.ARGB32, (int)intermediateSize.Width, (int)intermediateSize.Height); |
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using (var context = new Context(intermediate)) |
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{ |
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Rect drawRect; |
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var transform = CalculateIntermediateTransform( |
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tileMode, |
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sourceRect, |
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destinationRect, |
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scale, |
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translate, |
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out drawRect); |
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var renderer = new Renderer(intermediate); |
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context.Rectangle(drawRect.ToCairo()); |
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context.Clip(); |
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context.Transform(transform.ToCairo()); |
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renderer.Render(visual, new PlatformHandle(IntPtr.Zero, "RTB"), transform, drawRect); |
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var result = new SurfacePattern(intermediate); |
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if ((brush.TileMode & TileMode.FlipXY) != 0) |
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{ |
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// TODO: Currently always FlipXY as that's all cairo supports natively.
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// Support separate FlipX and FlipY by drawing flipped images to intermediate
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// surface.
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result.Extend = Extend.Reflect; |
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} |
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else |
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{ |
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result.Extend = Extend.Repeat; |
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} |
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if (brush.TileMode != TileMode.None) |
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{ |
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var matrix = result.Matrix; |
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matrix.InitTranslate(-destinationRect.X, -destinationRect.Y); |
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result.Matrix = matrix; |
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} |
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return result; |
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} |
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} |
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/// <summary>
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/// Calculates a translate based on a <see cref="TileBrush"/>, a source and destination
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/// rectangle and a scale.
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/// </summary>
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/// <param name="brush">The brush.</param>
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/// <param name="sourceRect">The source rectangle.</param>
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/// <param name="destinationRect">The destination rectangle.</param>
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/// <param name="scale">The scale factor.</param>
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/// <returns>A vector with the X and Y translate.</returns>
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private static Vector CalculateTranslate( |
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TileBrush brush, |
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Rect sourceRect, |
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Rect destinationRect, |
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Vector scale) |
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{ |
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var x = 0.0; |
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var y = 0.0; |
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var size = sourceRect.Size * scale; |
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switch (brush.AlignmentX) |
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{ |
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case AlignmentX.Center: |
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x += (destinationRect.Width - size.Width) / 2; |
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break; |
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case AlignmentX.Right: |
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x += destinationRect.Width - size.Width; |
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break; |
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} |
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switch (brush.AlignmentY) |
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{ |
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case AlignmentY.Center: |
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y += (destinationRect.Height - size.Height) / 2; |
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break; |
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case AlignmentY.Bottom: |
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y += destinationRect.Height - size.Height; |
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break; |
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} |
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return new Vector(x, y); |
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} |
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private static Size CalculateIntermediateSize( |
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TileMode tileMode, |
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Size targetSize, |
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Size destinationSize) |
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{ |
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var result = tileMode == TileMode.None ? targetSize : destinationSize; |
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return result; |
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} |
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private static Matrix CalculateIntermediateTransform( |
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TileMode tileMode, |
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Rect sourceRect, |
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Rect destinationRect, |
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Vector scale, |
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Vector translate, |
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out Rect drawRect) |
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{ |
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var transform = Matrix.CreateTranslation(-sourceRect.Position) * |
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Matrix.CreateScale(scale) * |
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Matrix.CreateTranslation(translate); |
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Rect dr; |
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if (tileMode == TileMode.None) |
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{ |
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dr = destinationRect; |
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transform *= Matrix.CreateTranslation(destinationRect.Position); |
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} |
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else |
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{ |
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dr = new Rect(destinationRect.Size); |
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} |
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drawRect = dr; |
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return transform; |
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} |
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} |
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} |
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