[NTGDI][FREETYPE] Follow-up of #4901 (57702ed)

- Drop APIENTRYs for static functions.
- Use FIELD_OFFSET instead of offsetof.
- Delete unnecessary ASSERTs.
- Add annotations.
CORE-11848

win32ss/gdi/ntgdi/font.h

···
     FONT_ENTRY_MEM *Entry;
 } FONT_ENTRY_COLL_MEM, *PFONT_ENTRY_COLL_MEM;
 
-#include <pshpack1.h> /* We don't like padding for these structures */
+#include <pshpack1.h> /* We don't like padding for these structures for hashing */
 
 typedef struct _EMULATION_BOLD_ITALIC
 {
···
 
 #include <poppack.h>
 
-C_ASSERT(offsetof(FONT_CACHE_ENTRY, GlyphIndex) % sizeof(DWORD) == 0);
-C_ASSERT(sizeof(FONT_CACHE_ENTRY) % sizeof(DWORD) == 0);
+C_ASSERT(FIELD_OFFSET(FONT_CACHE_ENTRY, GlyphIndex) % sizeof(DWORD) == 0); /* for hashing */
+C_ASSERT(sizeof(FONT_CACHE_ENTRY) % sizeof(DWORD) == 0); /* for hashing */
 
 /*
  * FONTSUBST_... --- constants for font substitutes

win32ss/gdi/ntgdi/freetype.c

···
  *   TRUE on success, FALSE on failure.
  *
  */
-static BOOLEAN APIENTRY
+static BOOLEAN
 IntTranslateCharsetInfo(PDWORD Src, /* [in]
                          if flags == TCI_SRCFONTSIG: pointer to fsCsb of a FONTSIGNATURE
                          if flags == TCI_SRCCHARSET: a character set value
···
     return FALSE;
 }
 
-static DWORD APIENTRY
-IntGetHash(LPCVOID pv, DWORD cdw)
+static DWORD
+IntGetHash(IN LPCVOID pv, IN DWORD cdw)
 {
     DWORD dwHash = cdw;
     const DWORD *pdw = pv;
···
     return dwHash;
 }
 
-FT_BitmapGlyph APIENTRY
-ftGdiGlyphCacheGet(const FONT_CACHE_ENTRY *pCache)
+static FT_BitmapGlyph
+ftGdiGlyphCacheGet(IN const FONT_CACHE_ENTRY *pCache)
 {
     PLIST_ENTRY CurrentEntry;
     PFONT_CACHE_ENTRY FontEntry;
···
 }
 
 /* no cache */
-FT_BitmapGlyph APIENTRY
+static FT_BitmapGlyph
 ftGdiGlyphSet(
     FT_Face Face,
     FT_GlyphSlot GlyphSlot,
···
     return BitmapGlyph;
 }
 
-FT_BitmapGlyph APIENTRY
+static FT_BitmapGlyph
 ftGdiGlyphCacheSet(
-    PFONT_CACHE_ENTRY Cache,
-    FT_GlyphSlot GlyphSlot)
+    IN OUT PFONT_CACHE_ENTRY Cache,
+    IN FT_GlyphSlot GlyphSlot)
 {
     FT_Glyph GlyphCopy;
     INT error;
···
     return needed;
 }
 
-FT_BitmapGlyph
-APIENTRY
+static FT_BitmapGlyph
 ftGdiGetRealGlyph(
-    PFONT_CACHE_ENTRY Cache)
+    IN OUT PFONT_CACHE_ENTRY Cache)
 {
     INT error;
     FT_GlyphSlot glyph;
···
     Cache.lfHeight = plf->lfHeight;
 
     Cache.Aspect.Emu.Bold = EMUBOLD_NEEDED(FontGDI->OriginalWeight, plf->lfWeight);
-    ASSERT(Cache.Aspect.Emu.Bold <= 1);
-
     Cache.Aspect.Emu.Italic = (plf->lfItalic && !FontGDI->OriginalItalic);
-    ASSERT(Cache.Aspect.Emu.Italic <= 1);
 
     if (IntIsFontRenderingEnabled())
         Cache.Aspect.RenderMode = (BYTE)IntGetFontRenderMode(plf);
···
 }
 
 /* Calculate width of the text. */
-BOOL
-APIENTRY
+static BOOL
 ftGdiGetTextWidth(
     LONGLONG *pTextWidth64,
     LPCWSTR String,
···
     Cache.lfHeight = plf->lfHeight;
 
     Cache.Aspect.Emu.Bold = EMUBOLD_NEEDED(FontGDI->OriginalWeight, plf->lfWeight);
-    ASSERT(Cache.Aspect.Emu.Bold <= 1);
-
     Cache.Aspect.Emu.Italic = (plf->lfItalic && !FontGDI->OriginalItalic);
-    ASSERT(Cache.Aspect.Emu.Italic <= 1);
 
     if (IntIsFontRenderingEnabled())
         Cache.Aspect.RenderMode = (BYTE)IntGetFontRenderMode(plf);