[freetype2] master 7f44c2d: [truetype] Do not set any ClearType flags in v40 monochrome mode.

[Werner LEMBERG]

branch: master
commit 7f44c2db247bdbaea4b369f214fde9614737196e
Author: Nikolaus Waxweiler <address@hidden>
Commit: Werner Lemberg <address@hidden>

    [truetype] Do not set any ClearType flags in v40 monochrome mode.
    
    This fixes weird behavior of instructions that resulted in rendering
    differences between v35 and v40 in monochrome mode, e.g., in
    `timesbi.ttf'.
    
    * src/truetype/ttinterp.c (Ins_GETINFO)
    [TT_SUPPORT_SUBPIXEL_HINTING_MINIMAL]: Check
    `subpixel_hinting_lean'.
---
 ChangeLog               | 12 ++++++++++++
 src/truetype/ttinterp.c |  6 +++++-
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index 3843d48..eac89db 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,15 @@
+2017-08-03  Nikolaus Waxweiler  <address@hidden>
+
+       [truetype] Do not set any ClearType flags in v40 monochrome mode.
+
+       This fixes weird behavior of instructions that resulted in rendering
+       differences between v35 and v40 in monochrome mode, e.g., in
+       `timesbi.ttf'.
+
+       * src/truetype/ttinterp.c (Ins_GETINFO)
+       [TT_SUPPORT_SUBPIXEL_HINTING_MINIMAL]: Check
+       `subpixel_hinting_lean'.
+
 2017-08-01  Werner Lemberg  <address@hidden>
 
        * src/truetype/ttgxvar.c (TT_Get_MM_Var): Fix thinko.
diff --git a/src/truetype/ttinterp.c b/src/truetype/ttinterp.c
index f8bf4af..8636d5e 100644
--- a/src/truetype/ttinterp.c
+++ b/src/truetype/ttinterp.c
@@ -7357,7 +7357,11 @@
       K |= 1 << 12;
 
 #ifdef TT_SUPPORT_SUBPIXEL_HINTING_MINIMAL
-    if ( SUBPIXEL_HINTING_MINIMAL )
+    /* Toggle the following flags only outside of monochrome mode.      */
+    /* Otherwise, instructions may behave weirdly and rendering results */
+    /* may differ between v35 and v40 mode, e.g., in `Times New Roman   */
+    /* Bold Italic'. */
+    if ( SUBPIXEL_HINTING_MINIMAL && exc->subpixel_hinting_lean )
     {
       /********************************/
       /* HINTING FOR SUBPIXEL         */