Fix GDI zero-ink glyph handling

2026-08-15 10:30:32 -04:00
parent d38511665a
commit 3289948ce7
5 changed files with 107 additions and 8 deletions
--- a/engine/Age.Engine.Tests/WindowsGdiGlyphMaskRasterizerTests.cs
+++ b/engine/Age.Engine.Tests/WindowsGdiGlyphMaskRasterizerTests.cs
@@ -60,6 +60,19 @@ public class WindowsGdiGlyphMaskRasterizerTests
        Assert.All(actual.Coverage.ToArray(), value => Assert.InRange(value, (byte)0, (byte)16));
    }

+    [Fact]
+    public void IdeographicSpacePreservesAdvanceWithTransparentCoverage()
+    {
+        if (!WindowsGdiGlyphMaskRasterizer.TryGetAvailability(out _)) return;
+
+        using var rasterizer = new WindowsGdiGlyphMaskRasterizer();
+        GlyphMask space = rasterizer.Rasterize(
+            NativeRequest("ＭＳ 明朝", 24, -12, 0, 0x3000));
+
+        Assert.True(space.CellAdvanceX > 0);
+        Assert.All(space.Coverage.ToArray(), value => Assert.Equal(0, value));
+    }
+
    [Fact]
    public void FontHandlesUseTheSharedBoundedLruAndDisposeCleanly()
    {