Since Ewald Hew factored the Adobe hinting engine out of the CFF
driver code, we can now use it on Type 1 (and CID) font formats, as
both have the same hinting philosophy.
This change activates the Adobe hinter when in LIGHT mode, and
therefore always unless explicitly asking for the auto-hinter. This
makes LIGHT behavior consistent with CFF fonts. As of this commit,
the hinting engine table looks as follows.
LIGHT NORMAL
-------------------------
TrueType Auto v40
CFF Adobe Adobe
Type 1 Adobe Adobe
The interpreter in Type 1 mode rewinds the charstring after collecting
all hints for building the initial hintmap (commit d52dd7f). However,
some charstrings use `endchar' in a final subroutine call, rewinding to
the start of that subroutine, and only a small section of the actual
glyph is drawn.
* src/psaux/psintrp.c (cf2_interpT2CharString) <cf2_cmdENDCHAR>:
Ensure we are on the top level charstring before rewinding.
See the report by Yang Yinsen.
https://lists.gnu.org/archive/html/freetype-devel/2017-11/msg00000.html
* src/truetype/ttobjs.c (trick_names): Add `DFGothic-EB',
`DFGyoSho-Lt', `DFHSGothic-W5', `DFHSMincho-W3' and `DFHSMincho-W7'.
(tt_check_trickyness_sfnt_ids): Add checksums for DFGothic-EB,
DFGyoSho-Lt, DFHSGothic-W5, DFHSMincho-W3 and DFHSMincho-W7. Also
add checksums for DLCLiShu and DLCHayBold which their family names
were already listed but their checksums were previously unknown.
We used to split large glyphs into horizontal bands and continue
bisecting them still horizontally if that was not enough. This is
guaranteed to fail when a single scanline cannot fit into the
rendering memory pool. Now we bisect the bands vertically so that
the smallest unit is a column of the band height, which is guranteed
to fit into memory.
* src/smooth/ftgrays.c (gray_convert_glyph): Implement it.
At large sizes almost but not exactly horizontal segments can quickly
drain the rendering pool. This patch at least avoids filling the pool
with trivial cells. Beyond this, we can only increase the pool size.
Reported, analyzed, and tested by Colin Fahey.
* src/smooth/ftgrays.c (gray_set_cell): Do not record trivial cells.
* src/base/ftobjs.c (FT_Load_Glyph): Tag tracing messages with
function name, glyph index, and load flags.
(FT_Select_Metrics, FT_Request_Metrics): Remove all tracing.
(FT_Select_Size, FT_Request_Size): Improve tracing.
* src/base/ftobjs.c (FT_New_Library): C4702: unreachable code.
(ft_glyphslot_preset_bitmap): C4244: possible loss of data.
* src/cff/cffload.c (cff_blend_doBlend): C4244: possible loss of data.
Turn `sum' into unsigned.
In runs on Noto Naskh Arabic, this results in 89 sets created
instead of 340 before. Makes auto-hinter setup with HarfBuzz
enabled 20% to 30% faster.
* src/autofit/afshaper.c (af_shaper_get_coverage): Implement it.
Implement property service in `type1' and `cid' drivers to allow
switching between FreeType or Adobe hinting engine when both are
available.
* src/cid/cidriver.c (cid_property_{set,get}, cid_services),
src/type1/t1driver.c (t1_property_{set,get}, t1_services): Add
Properties service.
* src/cid/cidobjs.c (cid_driver_init), src/type1/t1objs.c
(T1_Driver_Init): Add default property values.
This controls whether the old Type 1 engine gets compiled into FreeType.
It is disabled by default.
* devel/ftoption.h, include/freetype/config/ftoption.h
(T1_CONFIG_OPTION_OLD_ENGINE): New macro.
* include/freetype/internal/psaux.h (PS_Decoder): Remove unused field.
* include/freetype/internal/psaux.h, src/cid/cidgload.c
(cid_load_glyph), src/psaux/psauxmod.c, src/psaux/psobjs.c
(ps_builder_add_point), src/psaux/t1decode.c
(t1_lookup_glyph_by_stdcharcode, t1_decoder_parse_glyph,
t1operator_seac, t1_decoder_parse_charstrings), src/psaux/t1decode.h,
src/type1/t1gload.c (T1_Parse_Glyph_And_Get_Char_String): Surround
relevant code with macro.
Minor code changes.
Duplicate the fast advance width calculations from the old parser. This
is to facilitate adding options for compiling out the old parser.
* src/psaux/t1decode.{c,h} (t1_decoder_parse_metrics): New function.
* include/freetype/internal/psaux.h (T1_Decoder_Funcs): New entry
`parse_metrics'.
* src/psaux/psauxmod.c: Set the new entry.
* src/type1/t1gload.c (T1_Parse_Glyph_And_Get_Char_String),
src/cid/cidgload.c (cid_load_glyph): Separate
conditional for selecting engine.
This commit completely separates the interaction between named
instances and variation functions. In particular, resetting the
variation returns to the current named instance (if set) and not to
the base font.
As a side effect, variation functions no longer change the named
instance index.
* src/cff/cffobjs.c (cff_face_init): Use MM service's `set_instance'
function.
Also apply `MVAR' table to named instances.
* src/truetype/ttgxvar.c (TT_Get_MM_Var): Add cast.
(tt_set_mm_blend): No longer check whether requested variation
coincides with a named instance.
(TT_Set_Var_Design): Use current named instance for default
coordinates.
* src/truetype/ttobjs.c (tt_face_init): Use `TT_Set_Named_Instance'.
* include/freetype/internal/cfftypes.h (CFF_FontRec): Add
`font_extra' entry.
* src/cff/cffdrivr.c (cff_ps_get_font_extra): New function to
retrieve FSType info from the embedded PostScript data.
(cff_service_ps_info): Register function.
* src/cff/cffload.c (cff_font_done): Free `font_extra'.
* src/base/ftobjs.c (FT_Load_Glyph): Preset the bitmap metrics when
appropriate but `FT_Render_Glyph' is not called.
* include/freetype/freetype.h (FT_GlyphSlotRec): Document the change.
* src/raster/ftrend1.c (ft_raster1_render): Clean up the exit.
* src/smooth/ftsmooth.c (ft_smooth_render_generic): Reduce
translations and clean up the exit.
(ft_smooth_render_lcd, ft_smooth_render_lcd): Remove unused `error'..
This mainly just extracts the code for presetting the bitmap metrics
from the monochrome, grayscale, and LCD renderers into a separate
function.
* src/base/ftobjs.c (ft_glyphslot_preset_bitmap): New function that
calculates prespective bitmap metrics for the given rendering mode.
* include/freetype/internal/ftobjs.h (ft_glyphslot_preset_bitmap):
Declare it.
* src/base/ftlcdfil.c (ft_lcd_padding): New helper function that adds
padding to CBox taking into account pecularities of LCD rendering.
* include/freetype/ftlcdfil.h (ft_lcd_padding): Declare it.
* src/raster/ftrend1.c (ft_raster1_render): Reworked to use
`ft_glyphslot_preset_bitmap'.
* src/smooth/ftsmooth.c (ft_smooth_render_generic): Ditto.
(ft_smooth_render_lcd, ft_smooth_render_lcd): The pixel_mode setting
is moved to `ft_glyphslot_preset_bitmap'.
Nikolaus Waxweiler