[PATCH v2 1/2] win32u: Implement fontconfig_get_default_font_for_char().

[समीर सिंह Sameer Singh]

From: समीर सिंह Sameer Singh <[e-mail]>

This would allow Uniscribe to dynamically populate script based
fallback mappings in the registry based on the system's available fonts.
---
 dlls/win32u/freetype.c      | 45 +++++++++++++++++++++++++++++++++++++
 dlls/win32u/ntgdi_private.h |  1 +
 2 files changed, 46 insertions(+)

diff --git a/dlls/win32u/freetype.c b/dlls/win32u/freetype.c
index a660b166a0f..b5238ab337c 100644
--- a/dlls/win32u/freetype.c
+++ b/dlls/win32u/freetype.c
@@ -131,6 +131,10 @@ MAKE_FUNCPTR(FcDefaultSubstitute);
 MAKE_FUNCPTR(FcFontList);
 MAKE_FUNCPTR(FcFontMatch);
 MAKE_FUNCPTR(FcFontSetDestroy);
+MAKE_FUNCPTR(FcCharSetAddChar);
+MAKE_FUNCPTR(FcCharSetCreate);
+MAKE_FUNCPTR(FcCharSetDestroy);
+MAKE_FUNCPTR(FcPatternAddCharSet);
 MAKE_FUNCPTR(FcInit);
 MAKE_FUNCPTR(FcPatternAddString);
 MAKE_FUNCPTR(FcPatternCreate);
@@ -1249,6 +1253,10 @@ static void init_fontconfig(void)
     LOAD_FUNCPTR(FcFontList);
     LOAD_FUNCPTR(FcFontMatch);
     LOAD_FUNCPTR(FcFontSetDestroy);
+    LOAD_FUNCPTR(FcCharSetAddChar);
+    LOAD_FUNCPTR(FcCharSetCreate);
+    LOAD_FUNCPTR(FcCharSetDestroy);
+    LOAD_FUNCPTR(FcPatternAddCharSet);
     LOAD_FUNCPTR(FcInit);
     LOAD_FUNCPTR(FcPatternAddString);
     LOAD_FUNCPTR(FcPatternCreate);
@@ -2027,6 +2035,42 @@ static BOOL fontconfig_enum_family_fallbacks( UINT pitch_and_family, int index,
     return FALSE;
 }
 
+/*************************************************************
+ * fontconfig_get_default_font_for_char
+ */
+static void fontconfig_get_default_font_for_char( DWORD ch, WCHAR *font_name )
+{
+#ifdef SONAME_LIBFONTCONFIG
+    FcPattern *pattern, *match;
+    FcResult result;
+    const char *name = NULL;
+    FcCharSet *charset;
+    DWORD len;
+
+    *font_name = 0;
+
+    pattern = pFcPatternCreate();
+    charset = pFcCharSetCreate();
+    pFcCharSetAddChar( charset, ch );
+    pFcPatternAddCharSet( pattern, FC_CHARSET, charset );
+    pFcCharSetDestroy( charset );
+
+    pFcConfigSubstitute( NULL, pattern, FcMatchPattern );
+    pFcDefaultSubstitute( pattern );
+    match = pFcFontMatch( NULL, pattern, &result );
+    if (match)
+    {
+        if (pFcPatternGetString( match, FC_FAMILY, 0, (FcChar8 **)&name ) == FcResultMatch && name)
+        {
+            RtlUTF8ToUnicodeN( font_name, (LF_FACESIZE - 1) * sizeof(WCHAR), &len, name, strlen(name) );
+            font_name[len / sizeof(WCHAR)] = 0;
+        }
+        pFcPatternDestroy( match );
+    }
+    pFcPatternDestroy( pattern );
+#endif
+}
+
 static DWORD get_ttc_offset( FT_Face ft_face, UINT face_index )
 {
     FT_ULong len;
@@ -3873,6 +3917,7 @@ static UINT freetype_get_kerning_pairs( struct gdi_font *font, KERNINGPAIR **pai
 static const struct font_backend_funcs font_funcs =
 {
     freetype_load_fonts,
+    fontconfig_get_default_font_for_char,
     fontconfig_enum_family_fallbacks,
     freetype_add_font,
     freetype_add_mem_font,
diff --git a/dlls/win32u/ntgdi_private.h b/dlls/win32u/ntgdi_private.h
index fcfbce58fea..ac77d2aa6ed 100644
--- a/dlls/win32u/ntgdi_private.h
+++ b/dlls/win32u/ntgdi_private.h
@@ -320,6 +320,7 @@ struct gdi_font
 struct font_backend_funcs
 {
     void  (*load_fonts)(void);
+    void  (*get_default_font_for_char)( DWORD ch, WCHAR *font_name );
     BOOL  (*enum_family_fallbacks)( UINT pitch_and_family, int index, WCHAR buffer[LF_FACESIZE] );
     INT   (*add_font)( const WCHAR *file, UINT flags );
     INT   (*add_mem_font)( void *ptr, SIZE_T size, UINT flags );
-- 
GitLab


https://gitlab.winehq.org/wine/wine/-/merge_requests/10672