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Allow native CFF hinter in FT_RENDER_MODE_LIGHT. 

Both the native CFF hinter and the auto-hinter now have a very
similar rendering style.

* include/freetype/freetype.h: Mention that FT_LOAD_TARGET_LIGHT no
longer implies FT_LOAD_FORCE_AUTOHINT.

* include/freetype/ftmodapi.h (FT_MODULE_DRIVER_HINTS_LIGHTLY): New
macro.

* include/freetype/internal/ftobjs.h (FT_DRIVER_HINTS_LIGHTLY): New
macro.

* src/cff/cffdrivr.c (cff_driver_class): Use it.

* src/base/ftobjs.c (FT_Load_Glyph): Update auto-hinter selection
logic.
This commit is contained in:
Jan Alexander Steffens (heftig) 2015-11-10 22:33:45 +01:00 committed by Werner Lemberg
parent 2985e4fa30
commit ccd3188af1
6 changed files with 39 additions and 15 deletions
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21
ChangeLog
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@ -1,3 +1,24 @@
2015-11-10 Jan Alexander Steffens (heftig) <jan.steffens@gmail.com>
Allow native CFF hinter in FT_RENDER_MODE_LIGHT.
Both the native CFF hinter and the auto-hinter now have a very
similar rendering style.
* include/freetype/freetype.h: Mention that FT_LOAD_TARGET_LIGHT no
longer implies FT_LOAD_FORCE_AUTOHINT.
* include/freetype/ftmodapi.h (FT_MODULE_DRIVER_HINTS_LIGHTLY): New
macro.
* include/freetype/internal/ftobjs.h (FT_DRIVER_HINTS_LIGHTLY): New
macro.
* src/cff/cffdrivr.c (cff_driver_class): Use it.
* src/base/ftobjs.c (FT_Load_Glyph): Update auto-hinter selection
logic.
2015-11-09 Werner Lemberg <wl@gnu.org>
* src/cid/cidload.c (cid_face_open): Fix GDBytes guard (#46408).

5
include/freetype/freetype.h
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@ -2821,9 +2821,6 @@ FT_BEGIN_HEADER
* have specified (e.g., the TrueType bytecode interpreter). You can set
* @FT_LOAD_FORCE_AUTOHINT to ensure that the auto-hinter is used.
*
* Also note that @FT_LOAD_TARGET_LIGHT is an exception, in that it
* always implies @FT_LOAD_FORCE_AUTOHINT.
*
* @values:
* FT_LOAD_TARGET_NORMAL ::
* This corresponds to the default hinting algorithm, optimized for
@ -2835,8 +2832,6 @@ FT_BEGIN_HEADER
* generated glyphs are more fuzzy but better resemble its original
* shape. A bit like rendering on Mac OS~X.
*
* As a special exception, this target implies @FT_LOAD_FORCE_AUTOHINT.
*
* FT_LOAD_TARGET_MONO ::
* Strong hinting algorithm that should only be used for monochrome
* output. The result is probably unpleasant if the glyph is rendered

3
include/freetype/ftmodapi.h
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@ -117,6 +117,8 @@ FT_BEGIN_HEADER
/* support vector outlines */
#define FT_MODULE_DRIVER_HAS_HINTER 0x400 /* the driver provides its */
/* own hinter */
#define FT_MODULE_DRIVER_HINTS_LIGHTLY 0x800 /* the driver's hinter */
/* produces LIGHT hints */
/* deprecated values */
@ -128,6 +130,7 @@ FT_BEGIN_HEADER
#define ft_module_driver_scalable FT_MODULE_DRIVER_SCALABLE
#define ft_module_driver_no_outlines FT_MODULE_DRIVER_NO_OUTLINES
#define ft_module_driver_has_hinter FT_MODULE_DRIVER_HAS_HINTER
#define ft_module_driver_hints_lightly FT_MODULE_DRIVER_HINTS_LIGHTLY
typedef FT_Pointer FT_Module_Interface;

3
include/freetype/internal/ftobjs.h
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@ -506,6 +506,9 @@ FT_BEGIN_HEADER
#define FT_DRIVER_HAS_HINTER( x ) ( FT_MODULE_CLASS( x )->module_flags & \
FT_MODULE_DRIVER_HAS_HINTER )
#define FT_DRIVER_HINTS_LIGHTLY( x ) ( FT_MODULE_CLASS( x )->module_flags & \
FT_MODULE_DRIVER_HINTS_LIGHTLY )
/*************************************************************************/
/* */

3
src/base/ftobjs.c
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@ -686,7 +686,8 @@
/* check the size of the `fpgm' and `prep' tables, too -- */
/* the assumption is that there don't exist real TTFs where */
/* both `fpgm' and `prep' tables are missing */
if ( mode == FT_RENDER_MODE_LIGHT ||
if ( ( mode == FT_RENDER_MODE_LIGHT &&
!FT_DRIVER_HINTS_LIGHTLY( driver ) ) ||
face->internal->ignore_unpatented_hinter ||
( FT_IS_SFNT( face ) &&
ttface->num_locations &&

3
src/cff/cffdrivr.c
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@ -872,7 +872,8 @@
FT_MODULE_FONT_DRIVER |
FT_MODULE_DRIVER_SCALABLE |
FT_MODULE_DRIVER_HAS_HINTER,
FT_MODULE_DRIVER_HAS_HINTER |
FT_MODULE_DRIVER_HINTS_LIGHTLY,
sizeof ( CFF_DriverRec ),
"cff",