Byeongsik Jeon : gdi32: Improves the subpixel rendering availability for FreeType 2.8.1+.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 66e446c5ec5c7f4f072358712151d75305dfbd49
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=66e446c5ec5c7f4f072358712...

Author: Byeongsik Jeon 
Date:   Tue Oct  9 14:11:07 2018 +0900

gdi32: Improves the subpixel rendering availability for FreeType 2.8.1+.

FreeType 2.8.1+ implemented its own subpixel rendering.
So FT_Err_Uniplemented_Feature check is not the reliable way.

Signed-off-by: Byeongsik Jeon 
Signed-off-by: Huw Davies 
Signed-off-by: Alexandre Julliard

---

dlls/gdi32/freetype.c | 22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/dlls/gdi32/freetype.c b/dlls/gdi32/freetype.c
index 36a3431..2dd2dcd 100644
--- a/dlls/gdi32/freetype.c
+++ b/dlls/gdi32/freetype.c
@@ -993,18 +993,22 @@ static BOOL is_hinting_enabled(void)

static BOOL is_subpixel_rendering_enabled( void )
 {
-#ifdef FT_LCD_FILTER_H
     static int enabled = -1;
     if (enabled == -1)
     {
-        enabled = (pFT_Library_SetLcdFilter &&
-                   pFT_Library_SetLcdFilter( NULL, 0 ) != FT_Err_Unimplemented_Feature);
+        /* FreeType >= 2.8.1 offers LCD-optimezed rendering without lcd filters. */
+        if (FT_SimpleVersion >= ((2 << 16) | (8 << 8) | (1 << 0)))
+            enabled = TRUE;
+#ifdef FT_LCD_FILTER_H
+        else if (pFT_Library_SetLcdFilter &&
+                 pFT_Library_SetLcdFilter( NULL, 0 ) != FT_Err_Unimplemented_Feature)
+            enabled = TRUE;
+#endif
+        else enabled = FALSE;
+
         TRACE("subpixel rendering is %senabled\n", enabled ? "" : "NOT ");
     }
     return enabled;
-#else
-    return FALSE;
-#endif
 }

@@ -7274,7 +7278,6 @@ static DWORD get_glyph_outline(GdiFont *incoming_font, UINT glyph, UINT format,
     case WINE_GGO_HBGR_BITMAP:
     case WINE_GGO_VRGB_BITMAP:
     case WINE_GGO_VBGR_BITMAP:
-#ifdef FT_LCD_FILTER_H
       {
         switch (ft_face->glyph->format)
         {
@@ -7360,8 +7363,10 @@ static DWORD get_glyph_outline(GdiFont *incoming_font, UINT glyph, UINT format,
             if ( needsTransform )
                 pFT_Outline_Transform (&ft_face->glyph->outline, &transMatTategaki);

+#ifdef FT_LCD_FILTER_H
             if ( pFT_Library_SetLcdFilter )
                 pFT_Library_SetLcdFilter( library, FT_LCD_FILTER_DEFAULT );
+#endif
             pFT_Render_Glyph (ft_face->glyph, render_mode);

src = ft_face->glyph->bitmap.buffer;
@@ -7442,9 +7447,6 @@ static DWORD get_glyph_outline(GdiFont *incoming_font, UINT glyph, UINT format,

break;
       }
-#else
-      return GDI_ERROR;
-#endif

case GGO_NATIVE:
       {