[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'.
diff --git a/ChangeLog b/ChangeLog
index 3843d48..eac89db 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,15 @@
+2017-08-03 Nikolaus Waxweiler <madigens@gmail.com>
+
+ [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 <wl@gnu.org>
* 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 */
