From 5ad16409847a17534389054a1b7f5fb83703fb4d Mon Sep 17 00:00:00 2001
From: Michael Lutz <michi@icosahedron.de>
Date: Wed, 6 Jan 2021 22:56:44 +0100
Subject: [PATCH] Codechange: Make OS font handle of the FontCache read-only.

---
 src/fontcache.cpp                   | 2 +-
 src/fontcache.h                     | 2 +-
 src/os/windows/string_uniscribe.cpp | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/fontcache.cpp b/src/fontcache.cpp
index 0b2764aabf..9cdc0b9755 100644
--- a/src/fontcache.cpp
+++ b/src/fontcache.cpp
@@ -756,7 +756,7 @@ public:
 	virtual GlyphID MapCharToGlyph(WChar key);
 	virtual const char *GetFontName() { return WIDE_TO_MB(this->logfont.lfFaceName); }
 	virtual bool IsBuiltInFont() { return false; }
-	virtual void *GetOSHandle() { return &this->logfont; }
+	virtual const void *GetOSHandle() { return &this->logfont; }
 };
 
 
diff --git a/src/fontcache.h b/src/fontcache.h
index 4c44876da1..fac08a3537 100644
--- a/src/fontcache.h
+++ b/src/fontcache.h
@@ -127,7 +127,7 @@ public:
 	 * Get the native OS font handle, if there is one.
 	 * @return Opaque OS font handle.
 	 */
-	virtual void *GetOSHandle()
+	virtual const void *GetOSHandle()
 	{
 		return nullptr;
 	}
diff --git a/src/os/windows/string_uniscribe.cpp b/src/os/windows/string_uniscribe.cpp
index ad37548662..6c0a9366e9 100644
--- a/src/os/windows/string_uniscribe.cpp
+++ b/src/os/windows/string_uniscribe.cpp
@@ -144,7 +144,7 @@ void UniscribeResetScriptCache(FontSize size)
 /** Load the matching native Windows font. */
 static HFONT HFontFromFont(Font *font)
 {
-	if (font->fc->GetOSHandle() != nullptr) return CreateFontIndirect((PLOGFONT)font->fc->GetOSHandle());
+	if (font->fc->GetOSHandle() != nullptr) return CreateFontIndirect((const PLOGFONT)font->fc->GetOSHandle());
 
 	LOGFONT logfont;
 	ZeroMemory(&logfont, sizeof(LOGFONT));