Add definition for IDWriteFactory8

meson.build

@@ -540,6 +540,14 @@ if host_machine.system() == 'windows'
       '-DNTDDI_VERSION=0x0A000010',
     ]
 
+    foreach i : range(8, 9)
+      if cpp_compiler.has_type('IDWriteFactory' + i.to_string(),
+                               prefix: ['#include <windows.h>', '#include <dwrite_3.h>'],
+                               args: sdk_version_args)
+        conf.set('HAVE_IDWRITEFACTORY' + i.to_string(), 1)
+      endif
+    endforeach
+
     if cpp_compiler.has_header('d2d1_2.h')
       conf.set('HAVE_D2D1_2_H', 1)
     endif

src/win32/dwrite-extra.hpp

@@ -5,6 +5,35 @@
 
 #include <dwrite_3.h>
 
+#ifndef HAVE_IDWRITEFACTORY8
+
+typedef enum DWRITE_PAINT_FEATURE_LEVEL {
+    DWRITE_PAINT_FEATURE_LEVEL_NONE = 0,
+    DWRITE_PAINT_FEATURE_LEVEL_COLR_V0 = 1,
+    DWRITE_PAINT_FEATURE_LEVEL_COLR_V1 = 2
+} DWRITE_PAINT_FEATURE_LEVEL;
+
+DEFINE_GUID(IID_IDWriteFactory8, 0xee0a7fb5, 0xdef4, 0x4c23, 0xa4,0x54, 0xc9,0xc7,0xdc,0x87,0x83,0x98);
+MIDL_INTERFACE("ee0a7fb5-def4-4c23-a454-c9c7dc878398")
+IDWriteFactory8 : public IDWriteFactory7
+{
+    virtual HRESULT STDMETHODCALLTYPE TranslateColorGlyphRun(
+        D2D1_POINT_2F origin,
+        const DWRITE_GLYPH_RUN *glyph_run,
+        const DWRITE_GLYPH_RUN_DESCRIPTION *glyph_run_desc,
+        DWRITE_GLYPH_IMAGE_FORMATS image_formats,
+        DWRITE_PAINT_FEATURE_LEVEL feature_level,
+        DWRITE_MEASURING_MODE measuring_mode,
+        const DWRITE_MATRIX *world_and_dpi_transform,
+        UINT32 palette_index,
+        IDWriteColorGlyphRunEnumerator1 **enumerator) = 0;
+};
+#ifdef __CRT_UUID_DECL
+__CRT_UUID_DECL(IDWriteFactory8, 0xee0a7fb5, 0xdef4, 0x4c23, 0xa4,0x54, 0xc9,0xc7,0xdc,0x87,0x83,0x98)
+#endif
+
+#endif
+
 #if defined(__MINGW64_VERSION_MAJOR) && __MINGW64_VERSION_MAJOR < 10
 // The DWRITE_COLOR_GLYPH_RUN struct isn't valid.
 // <https://sourceforge.net/p/mingw-w64/bugs/913/>