feat(desktop): P26 HUD 常驻元素半透明底色 + 1px 描边（昼/夜可读）

1 files changed, 21 insertions, 0 deletions

diff --git a/src/LivingVillage.Desktop.Tests/P16UiTests.fs b/src/LivingVillage.Desktop.Tests/P16UiTests.fs
index 2e474ac..b68bbd3 100644
--- a/src/LivingVillage.Desktop.Tests/P16UiTests.fs
+++ b/src/LivingVillage.Desktop.Tests/P16UiTests.fs
@@ -128,6 +128,27 @@ type P16HudTests () =
         Assert.IsTrue(ChineseText.requiredUiLabels |> List.contains "体力")
         Assert.IsTrue(ChineseText.requiredUiLabels |> List.contains "钱币")
 
+    [<TestMethod>]
+    member _.HudPersistentSegmentsGetBackdropAndOutlineInBothPeriods () =
+        // P26：白天/夜景两套调色板都要有半透明底色 + 不透明深色描边，保证常驻元素可读。
+        for mode in [ Day; Night ] do
+            let palette = HudLayout.palette mode
+            Assert.IsTrue(palette.SegmentBackdrop.A > 0uy, "segment backdrop must be translucent, not opaque")
+            Assert.IsTrue(palette.SegmentBackdrop.A < 255uy, "segment backdrop must keep the scene visible")
+            Assert.AreEqual<byte>(255uy, palette.Outline.A)
+            Assert.IsTrue(palette.Outline.R < 40uy && palette.Outline.G < 40uy && palette.Outline.B < 40uy)
+            let outlineSum = int palette.Outline.R + int palette.Outline.G + int palette.Outline.B
+            let valueSum = int palette.Value.R + int palette.Value.G + int palette.Value.B
+            Assert.IsTrue(outlineSum < valueSum, "outline must contrast with the bright value text")
+        Assert.AreEqual<int>(4, HudLayout.textOutlineOffsets.Length)
+        for (dx, dy) in HudLayout.textOutlineOffsets do
+            Assert.IsTrue(dx <> 0 || dy <> 0, "outline offset must be non-zero")
+        let placed = HudLayout.layout (HudLayout.segments world SimulationControl.initial)
+        for (x, width, _) in placed do
+            let rect = HudLayout.segmentBackdrop x width
+            Assert.IsTrue(rect.X <= x && rect.X + rect.Width >= x + width, "backdrop must cover the segment text")
+            Assert.IsTrue(rect.Y >= 0 && rect.Y + rect.Height <= HudLayout.barHeight, "backdrop must stay inside the bar")
+
 // ---- P16-FIX 菜单截图帧表 ----
 
 [<TestClass>]