danwalmsley
6 years ago
committed by
GitHub
GitHub
27 changed files with 400 additions and 87 deletions
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using System.Diagnostics; |
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using System.Runtime.InteropServices; |
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using Avalonia; |
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using Avalonia.Controls; |
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using Avalonia.LogicalTree; |
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using Avalonia.Media; |
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using Avalonia.Media.Imaging; |
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using Avalonia.Media.Immutable; |
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using Avalonia.Platform; |
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using Avalonia.Threading; |
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namespace RenderDemo.Pages |
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{ |
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public class WriteableBitmapPage : Control |
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{ |
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private WriteableBitmap _unpremulBitmap; |
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private WriteableBitmap _premulBitmap; |
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private readonly Stopwatch _st = Stopwatch.StartNew(); |
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protected override void OnAttachedToLogicalTree(LogicalTreeAttachmentEventArgs e) |
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{ |
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_unpremulBitmap = new WriteableBitmap(new PixelSize(256, 256), new Vector(96, 96), PixelFormat.Bgra8888, AlphaFormat.Unpremul); |
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_premulBitmap = new WriteableBitmap(new PixelSize(256, 256), new Vector(96, 96), PixelFormat.Bgra8888, AlphaFormat.Premul); |
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base.OnAttachedToLogicalTree(e); |
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} |
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protected override void OnDetachedFromLogicalTree(LogicalTreeAttachmentEventArgs e) |
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{ |
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base.OnDetachedFromLogicalTree(e); |
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_unpremulBitmap?.Dispose(); |
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_unpremulBitmap = null; |
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_premulBitmap?.Dispose(); |
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_unpremulBitmap = null; |
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} |
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public override void Render(DrawingContext context) |
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{ |
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void FillPixels(WriteableBitmap bitmap, byte fillAlpha, bool premul) |
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{ |
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using (var fb = bitmap.Lock()) |
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{ |
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var data = new int[fb.Size.Width * fb.Size.Height]; |
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for (int y = 0; y < fb.Size.Height; y++) |
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{ |
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for (int x = 0; x < fb.Size.Width; x++) |
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{ |
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var color = new Color(fillAlpha, 0, 255, 0); |
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if (premul) |
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{ |
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byte r = (byte) (color.R * color.A / 255); |
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byte g = (byte) (color.G * color.A / 255); |
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byte b = (byte) (color.B * color.A / 255); |
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color = new Color(fillAlpha, r, g, b); |
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} |
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data[y * fb.Size.Width + x] = (int) color.ToUint32(); |
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} |
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} |
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Marshal.Copy(data, 0, fb.Address, fb.Size.Width * fb.Size.Height); |
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} |
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} |
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base.Render(context); |
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byte alpha = (byte)((_st.ElapsedMilliseconds / 10) % 256); |
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FillPixels(_unpremulBitmap, alpha, false); |
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FillPixels(_premulBitmap, alpha, true); |
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context.FillRectangle(Brushes.Red, new Rect(0, 0, 256 * 3, 256)); |
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context.DrawImage(_unpremulBitmap, |
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new Rect(0, 0, 256, 256), |
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new Rect(0, 0, 256, 256)); |
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context.DrawImage(_premulBitmap, |
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new Rect(0, 0, 256, 256), |
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new Rect(256, 0, 256, 256)); |
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context.FillRectangle(new ImmutableSolidColorBrush(Colors.Lime, alpha / 255d), new Rect(512, 0, 256, 256)); |
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Dispatcher.UIThread.Post(InvalidateVisual, DispatcherPriority.Background); |
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} |
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} |
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} |
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@ -1,4 +1,14 @@ |
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Compat issues with assembly Avalonia.Visuals: |
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EnumValuesMustMatch : Enum value 'Avalonia.Media.FontStyle Avalonia.Media.FontStyle.Italic' is (System.Int32)1 in the implementation but (System.Int32)2 in the contract. |
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EnumValuesMustMatch : Enum value 'Avalonia.Media.FontStyle Avalonia.Media.FontStyle.Oblique' is (System.Int32)2 in the implementation but (System.Int32)1 in the contract. |
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Total Issues: 2 |
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InterfacesShouldHaveSameMembers : Interface member 'public Avalonia.Platform.AlphaFormat Avalonia.Platform.IPlatformRenderInterface.DefaultAlphaFormat' is present in the implementation but not in the contract. |
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InterfacesShouldHaveSameMembers : Interface member 'public Avalonia.Platform.PixelFormat Avalonia.Platform.IPlatformRenderInterface.DefaultPixelFormat' is present in the implementation but not in the contract. |
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InterfacesShouldHaveSameMembers : Interface member 'public Avalonia.Platform.IWriteableBitmapImpl Avalonia.Platform.IPlatformRenderInterface.CreateWriteableBitmap(Avalonia.PixelSize, Avalonia.Vector, Avalonia.Platform.PixelFormat, Avalonia.Platform.AlphaFormat)' is present in the implementation but not in the contract. |
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InterfacesShouldHaveSameMembers : Interface member 'public Avalonia.Platform.IWriteableBitmapImpl Avalonia.Platform.IPlatformRenderInterface.CreateWriteableBitmap(Avalonia.PixelSize, Avalonia.Vector, System.Nullable<Avalonia.Platform.PixelFormat>)' is present in the contract but not in the implementation. |
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MembersMustExist : Member 'public Avalonia.Platform.IWriteableBitmapImpl Avalonia.Platform.IPlatformRenderInterface.CreateWriteableBitmap(Avalonia.PixelSize, Avalonia.Vector, System.Nullable<Avalonia.Platform.PixelFormat>)' does not exist in the implementation but it does exist in the contract. |
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InterfacesShouldHaveSameMembers : Interface member 'public Avalonia.Platform.AlphaFormat Avalonia.Platform.IPlatformRenderInterface.DefaultAlphaFormat.get()' is present in the implementation but not in the contract. |
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InterfacesShouldHaveSameMembers : Interface member 'public Avalonia.Platform.PixelFormat Avalonia.Platform.IPlatformRenderInterface.DefaultPixelFormat.get()' is present in the implementation but not in the contract. |
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InterfacesShouldHaveSameMembers : Interface member 'public Avalonia.Platform.IBitmapImpl Avalonia.Platform.IPlatformRenderInterface.LoadBitmap(Avalonia.Platform.PixelFormat, Avalonia.Platform.AlphaFormat, System.IntPtr, Avalonia.PixelSize, Avalonia.Vector, System.Int32)' is present in the implementation but not in the contract. |
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InterfacesShouldHaveSameMembers : Interface member 'public Avalonia.Platform.IBitmapImpl Avalonia.Platform.IPlatformRenderInterface.LoadBitmap(Avalonia.Platform.PixelFormat, System.IntPtr, Avalonia.PixelSize, Avalonia.Vector, System.Int32)' is present in the contract but not in the implementation. |
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MembersMustExist : Member 'public Avalonia.Platform.IBitmapImpl Avalonia.Platform.IPlatformRenderInterface.LoadBitmap(Avalonia.Platform.PixelFormat, System.IntPtr, Avalonia.PixelSize, Avalonia.Vector, System.Int32)' does not exist in the implementation but it does exist in the contract. |
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Total Issues: 12 |
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@ -0,0 +1,21 @@ |
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namespace Avalonia.Platform |
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{ |
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/// <summary>
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/// Describes how to interpret the alpha component of a pixel.
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/// </summary>
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public enum AlphaFormat |
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{ |
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/// <summary>
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/// All pixels have their alpha premultiplied in their color components.
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/// </summary>
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Premul, |
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/// <summary>
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/// All pixels have their color components stored without any regard to the alpha. e.g. this is the default configuration for PNG images.
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/// </summary>
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Unpremul, |
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/// <summary>
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/// All pixels are stored as opaque.
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/// </summary>
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Opaque |
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} |
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} |
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