Commit: patch 9.1.2127: MS-Windows: DirectX renders font too small

[Christian Brabandt]

patch 9.1.2127: MS-Windows: DirectX renders font too small

Commit: https://github.com/vim/vim/commit/fccd6f9b1457cb8ccf9326f7083e1d60cf37b1ce
Author: Yasuhiro Matsumoto <matt...@gmail.com>
Date: Mon Feb 2 10:23:27 2026 +0000

patch 9.1.2127: MS-Windows: DirectX renders font too small

Problem: MS-Windows: DirectX renders font too small in comparison to
the GDI rendering (Linwei, after v9.1.2125)
Solution: Implement proper font clipping (Yasuhiro Matsumoto)

related: #19254
closes: #19304

Signed-off-by: Yasuhiro Matsumoto <matt...@gmail.com>
Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/src/gui_dwrite.cpp b/src/gui_dwrite.cpp
index b228d28f5..5d4cb6c3a 100644
--- a/src/gui_dwrite.cpp
+++ b/src/gui_dwrite.cpp
@@ -820,9 +820,6 @@ DWriteContext::CreateTextFormatFromLOGFONT(const LOGFONTW &logFont,
fontSize = fontSize * float(fontMetrics.designUnitsPerEm)
/ float(fontMetrics.ascent + fontMetrics.descent);
}
-
- // Scale by ascent ratio to match GDI rendering size
- fontSize = ceil(fontSize * float(fontMetrics.ascent) / float(fontMetrics.designUnitsPerEm));
}

// The text format includes a locale name. Ideally, this would be the
@@ -1055,6 +1052,15 @@ DWriteContext::DrawText(const WCHAR *text, int len,

SetDrawingMode(DM_DIRECTX);

+ // Apply clipping if ETO_CLIPPED is specified
+ if ((fuOptions & ETO_CLIPPED) && lprc != NULL)
+ {
+ mRT->PushAxisAlignedClip(
+ D2D1::RectF(FLOAT(lprc->left), FLOAT(lprc->top),
+ FLOAT(lprc->right), FLOAT(lprc->bottom)),
+ D2D1_ANTIALIAS_MODE_ALIASED);
+ }
+
hr = mDWriteFactory->CreateTextLayout(text, len, mTextFormat,
FLOAT(w), FLOAT(h), &textLayout);

@@ -1080,6 +1086,9 @@ DWriteContext::DrawText(const WCHAR *text, int len,
}

SafeRelease(&textLayout);
+
+ if ((fuOptions & ETO_CLIPPED) && lprc != NULL)
+ mRT->PopAxisAlignedClip();
}

void
diff --git a/src/version.c b/src/version.c
index def269c8f..7e44624ff 100644
--- a/src/version.c
+++ b/src/version.c
@@ -734,6 +734,8 @@ static char *(features[]) =

static int included_patches[] =
{ /* Add new patch number below this line */
+/**/
+ 2127,
/**/
2126,
/**/