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GrayscaleAwareImage : Image bakes a luma-transformed Bitmap on the disabled edge (BT.601 weights) and swaps Source. Replaces the blanket Opacity=0.35 setter that was the previous cue. Applied to the static toolbar buttons in MainToolBar.axaml plus the MEF-built buttons constructed in BuildButton. Assisted-by: Claude:claude-opus-4-7:Claude Codepull/3755/head
Siegfried Pammer
2 months ago
4 changed files with 160 additions and 24 deletions
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// Copyright (c) 2026 AlphaSierraPapa for the SharpDevelop Team
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy of this
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// software and associated documentation files (the "Software"), to deal in the Software
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// without restriction, including without limitation the rights to use, copy, modify, merge,
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// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
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// to whom the Software is 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 all copies or
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// 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 IMPLIED,
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// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
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// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
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// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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using System; |
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using Avalonia; |
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using Avalonia.Controls; |
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using Avalonia.Media; |
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using Avalonia.Media.Imaging; |
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using Avalonia.Platform; |
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namespace ILSpy.Views.Controls |
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{ |
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/// <summary>
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/// An <see cref="Image"/> that swaps in a desaturated copy of its <see cref="Image.Source"/>
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/// whenever the control is effectively disabled — i.e. the templated parent (a toolbar Button
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/// / ToggleButton / SplitButton) is disabled, propagated through <c>IsEffectivelyEnabled</c>.
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/// The grayscale copy is baked once per source by rendering the original <see cref="IImage"/>
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/// into a <see cref="RenderTargetBitmap"/> and applying a BT.601 luma transform to the pixels.
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/// Caching is per instance: the same <see cref="Image.Source"/> reference will be re-baked if
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/// the user reuses the control with a different image.
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/// </summary>
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public sealed class GrayscaleAwareImage : Image |
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{ |
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static GrayscaleAwareImage() |
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{ |
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SourceProperty.Changed.AddClassHandler<GrayscaleAwareImage>(static (c, e) => c.OnSourceChanged(e)); |
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IsEffectivelyEnabledProperty.Changed.AddClassHandler<GrayscaleAwareImage>(static (c, _) => c.UpdateEffectiveSource()); |
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} |
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IImage? originalSource; |
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Bitmap? grayscaleCache; |
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bool suppressSourceCallback; |
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void OnSourceChanged(AvaloniaPropertyChangedEventArgs e) |
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{ |
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// Re-entrancy guard: SetSourceInternal triggers the property-changed handler too.
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if (suppressSourceCallback) |
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return; |
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originalSource = e.NewValue as IImage; |
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grayscaleCache = null; |
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UpdateEffectiveSource(); |
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} |
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void UpdateEffectiveSource() |
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{ |
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if (originalSource is null) |
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return; |
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if (IsEffectivelyEnabled) |
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{ |
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SetSourceInternal(originalSource); |
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} |
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else |
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{ |
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grayscaleCache ??= TryBakeGrayscale(originalSource); |
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// Fall back to the original on bake failure (e.g. zero-sized source) so the
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// button still has a recognisable icon, just not desaturated.
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SetSourceInternal((IImage?)grayscaleCache ?? originalSource); |
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} |
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} |
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void SetSourceInternal(IImage source) |
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{ |
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suppressSourceCallback = true; |
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try |
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{ Source = source; } |
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finally { suppressSourceCallback = false; } |
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} |
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static Bitmap? TryBakeGrayscale(IImage source) |
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{ |
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var size = source.Size; |
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if (size.Width <= 0 || size.Height <= 0) |
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return null; |
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var pixelSize = new PixelSize( |
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Math.Max(1, (int)Math.Ceiling(size.Width)), |
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Math.Max(1, (int)Math.Ceiling(size.Height))); |
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var dpi = new Vector(96, 96); |
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// Render into a RenderTargetBitmap at the source's intrinsic size so vector
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// sources (SVG) rasterize at native resolution. The Image control then scales the
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// result to its own bounds, same as the live IImage path.
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using var rtb = new RenderTargetBitmap(pixelSize, dpi); |
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using (var ctx = rtb.CreateDrawingContext()) |
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{ |
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source.Draw(ctx, new Rect(size), new Rect(0, 0, pixelSize.Width, pixelSize.Height)); |
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} |
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var target = new WriteableBitmap(pixelSize, dpi, PixelFormat.Bgra8888, AlphaFormat.Premul); |
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using (var fb = target.Lock()) |
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{ |
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int stride = fb.RowBytes; |
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int byteCount = stride * pixelSize.Height; |
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rtb.CopyPixels(new PixelRect(pixelSize), fb.Address, byteCount, stride); |
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ApplyLuma(fb.Address, pixelSize, stride); |
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} |
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return target; |
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} |
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static unsafe void ApplyLuma(IntPtr address, PixelSize pixelSize, int stride) |
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{ |
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// BT.601 luma weights × 256 = (77, 150, 29) for R, G, B. In premultiplied BGRA the
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// channels are (B, G, R, A) and luma is linear in α, so the same weighted sum works
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// without an unpremul/repremul round-trip.
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byte* basePtr = (byte*)address; |
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for (int y = 0; y < pixelSize.Height; y++) |
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{ |
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byte* row = basePtr + y * stride; |
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for (int x = 0; x < pixelSize.Width; x++) |
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{ |
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byte* px = row + x * 4; |
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int luma = (77 * px[2] + 150 * px[1] + 29 * px[0]) >> 8; |
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if (luma > 255) |
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luma = 255; |
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byte y8 = (byte)luma; |
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px[0] = y8; |
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px[1] = y8; |
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px[2] = y8; |
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} |
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} |
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} |
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} |
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} |
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