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feat(D.5.2): IconComposer effect-color + ReplaceColorWhite helpers

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ReplaceColorWhite (retail SurfaceWindow::ReplaceColor 0x00441530):
replaces only pure-white-opaque (RGBA 255,255,255,255) pixels in place.
TryGetEffectColor: resolves the effect tile DID via ResolveEffectDid,
decodes the RenderSurface, and returns the mean-opaque RGB as the tint
color (divergence DR-2: exact retail color byte is decompiler-ambiguous).
TryDecode: shared RenderSurface decode helper for the effect path.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Erik 2026-06-17 18:38:51 +02:00
parent 75ac51ac23
commit 3e019e408a
2 changed files with 74 additions and 0 deletions
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18
tests/AcDream.App.Tests/UI/IconComposerTests.cs
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@ -126,4 +126,22 @@ public class IconComposerTests
Assert.Equal(0x060011C5u, composer.ResolveEffectDid(0x1000u));
Assert.Equal(0x060011C5u, composer.ResolveEffectDid(0x0000u));
}
[Fact]
public void ReplaceColorWhite_replacesOnlyPureWhiteOpaque()
{
// 2x2: [white-opaque, red-opaque, white-transparent, white-opaque]
var px = new byte[]
{
255,255,255,255, // pure white opaque → replaced
255, 0, 0,255, // red → untouched
255,255,255, 0, // white but alpha 0 → untouched (not 0xFFFFFFFF)
255,255,255,255, // pure white opaque → replaced
};
IconComposer.ReplaceColorWhite(px, 2, 2, (10, 20, 30, 255));
Assert.Equal(new byte[] { 10, 20, 30, 255 }, px[0..4]); // replaced
Assert.Equal(new byte[] { 255, 0, 0, 255 }, px[4..8]); // untouched
Assert.Equal(new byte[] { 255, 255, 255, 0 }, px[8..12]); // untouched
Assert.Equal(new byte[] { 10, 20, 30, 255 }, px[12..16]); // replaced
}
}