ref: b0522701f890372ff9f3d921cf212bccd1f64400
parent: 37580053b491b69284988ed25cbbf6e884151eb0
author: Werner Lemberg <[email protected]>
date: Thu May 16 08:52:57 EDT 2019
[truetype] Actually scale varied CVT values. Up to now, only the unscaled CVT values were varied; in other words, the `CVAR' data was never used for bytecode hinting. * src/truetype/ttgxvar.c (tt_cvt_ready_iterator): New auxiliary function. (tt_face_vary_cvt): Use it to trigger rescaling of CVT values.
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,16 @@
2019-05-16 Werner Lemberg <[email protected]>
+ [truetype] Actually scale varied CVT values.
+
+ Up to now, only the unscaled CVT values were varied; in other words,
+ the `CVAR' data was never used for bytecode hinting.
+
+ * src/truetype/ttgxvar.c (tt_cvt_ready_iterator): New auxiliary
+ function.
+ (tt_face_vary_cvt): Use it to trigger rescaling of CVT values.
+
+2019-05-16 Werner Lemberg <[email protected]>
+
[truetype] Use 26.6 format for storing unscaled CVT values.
If `CVAR' data is applied to variation fonts, fractional values are
--- a/docs/CHANGES
+++ b/docs/CHANGES
@@ -3,7 +3,10 @@
I. IMPORTANT BUG FIXES
+ - The bytecode hinting of OpenType variation fonts was flawed, since
+ the data in the `CVAR' table wasn't correctly applied.
+
II. MISCELLANEOUS
- Auto-hinter support for Mongolian.
@@ -18,6 +21,9 @@
- If `FT_Set_Named_Instance' was called with the same arguments
twice in a row, the function returned an incorrect error code the
second time.
+
+ - Increased precision while computing OpenType font variation
+ instances.
======================================================================
--- a/src/truetype/ttgxvar.c
+++ b/src/truetype/ttgxvar.c
@@ -3113,6 +3113,21 @@
/*************************************************************************/
+ static FT_Error
+ tt_cvt_ready_iterator( FT_ListNode node,
+ void* user )
+ {+ TT_Size size = (TT_Size)node->data;
+
+ FT_UNUSED( user );
+
+
+ size->cvt_ready = -1;
+
+ return FT_Err_Ok;
+ }
+
+
/**************************************************************************
*
* @Function:
@@ -3143,6 +3158,8 @@
FT_Error error;
FT_Memory memory = stream->memory;
+ FT_Face root = &face->root;
+
FT_ULong table_start;
FT_ULong table_len;
@@ -3450,6 +3467,12 @@
FT_FREE( im_start_coords );
FT_FREE( im_end_coords );
FT_FREE( cvt_deltas );
+
+ /* iterate over all FT_Size objects and set `cvt_ready' to -1 */
+ /* to trigger rescaling of all CVT values */
+ FT_List_Iterate( &root->sizes_list,
+ tt_cvt_ready_iterator,
+ NULL );
return error;
}