* include/freetype/config/ftoption.h
(AF_CONFIG_OPTION_TT_SIZE_METRICS): New option, commented out by
default.
* src/autofit/afloader.c (af_loader_load_glyph): Use
AF_CONFIG_OPTION_TT_SIZE_METRICS to guard the corresponding code.
This mode uses fractional advance widths and doesn't scale glyphs
horizontally, only applying vertical scaling and hinting.
At the same time, the behaviour of the `light' auto-hinter gets
restored for backwards compatibility: Both vertical and horizontal
scaling is again based on rounded metrics values (this was changed
in a commit from 2017-03-30 as a side effect). To be more precise,
the behaviour is restored for TrueType fonts only; for other font
formats like Type 1, this is a new feature of the `light' hinting
mode.
* include/freetype/freetype.h (FT_LOAD_TARGET_SLIGHT): New macro.
(FT_RENDER_MODE_SLIGHT): New render mode.
* include/freetype/internal/ftobjs.h (FT_Size_InternalRec): Add
`autohint_mode' and `autohint_metrics' fields.
* src/autofit/afcjk.c (af_cjk_hints_init), src/autofit/aflatin.c
(af_latin_hints_init), src/autofit/aflatin2 (af_latin2_hints_init):
Updated.
* src/autofit/afloader.c (af_loader_embolden_glyph_in_slot): Use
`autohint_metrics'.
(af_loader_load_glyph): s/internal/slot_internal/.
Initialize `autohint_metrics' and `autohint_mode' depending on
current auto-hint mode.
Use `autohint_metrics'.
Updated.
* src/base/ftadvanc.c (LOAD_ADVANCE_FAST_CHECK): Updated.
* src/base/ftobjs.c (FT_Load_Glyph): Updated.
(FT_New_Size): Allocate `internal' object.
* src/pshinter/pshalgo.c (ps_hints_apply): Updated.
* src/smooth/ftsmooth.c (ft_smooth_render): Updated.
* src/autofit/afblue.dat: Add blue zone data for Old Turkic.
* src/autofit/afblue.c, src/autofit/afblue.h: Regenerated.
* src/autofit/afscript.h: Add Old Turkic standard characters.
* src/autofit/afranges.c, src/autofit/afstyles.h: Add Old Turkic data.
* src/autofit/afblue.dat: Add blue zone data for Gothic.
* src/autofit/afblue.c, src/autofit/afblue.h: Regenerated.
* src/autofit/afscript.h: Add Gothic standard characters.
* src/autofit/afranges.c, src/autofit/afstyles.h: Add Gothic data.
* src/autofit/afblue.dat: Add blue zone data for Cypriot.
* src/autofit/afblue.c, src/autofit/afblue.h: Regenerated.
* src/autofit/afscript.h: Add Cypriot standard characters.
* src/autofit/afranges.c, src/autofit/afstyles.h: Add Cypriot data.
* src/autofit/afblue.dat: Add blue zone data for Deseret.
* src/autofit/afblue.c, src/autofit/afblue.h: Regenerated.
* src/autofit/afscript.h: Add Deseret standard characters.
* src/autofit/afranges.c, src/autofit/afstyles.h: Add Deseret data.
* src/autofit/afblue.dat: Add blue zone data for Lisu.
* src/autofit/afblue.c, src/autofit/afblue.h: Regenerated.
* src/autofit/afscript.h: Add Lisu standard characters.
* src/autofit/afranges.c, src/autofit/afstyles.h: Add Lisu data.
* src/autofit/afblue.dat: Add blue zone data for Osage.
* src/autofit/afblue.c, src/autofit/afblue.h: Regenerated.
* src/autofit/afscript.h: Add Osage standard characters.
* src/autofit/afranges.c, src/autofit/afstyles.h: Add Osage data.
* src/autofit/afblue.dat: Add blue zone data for Glagolitic.
* src/autofit/afblue.c, src/autofit/afblue.h: Regenerated.
* src/autofit/afscript.h: Add Glagolitic standard characters.
* src/autofit/afranges.c, src/autofit/afstyles.h: Add Glagolitic data.
* src/autofit/afblue.dat: Add blue zone data for Tai Viet.
* src/autofit/afblue.c, src/autofit/afblue.h: Regenerated.
* src/autofit/afscript.h: Add Tai Viet standard characters.
* src/autofit/afranges.c, src/autofit/afstyles.h: Add Tai Viet data.
* src/autofit/afblue.dat: Add blue zone data for Tifinagh.
* src/autofit/afblue.c, src/autofit/afblue.h: Regenerated.
* src/autofit/afscript.h: Add Tifinagh standard characters.
* src/autofit/afranges.c, src/autofit/afstyles.h: Add Tifinagh data.
* src/autofit/afblue.dat: Add blue zone data for N'Ko.
* src/autofit/afblue.c, src/autofit/afblue.h: Regenerated.
* src/autofit/afscript.h: Add N'Ko standard characters.
* src/autofit/afranges.c, src/autofit/afstyles.h: Add N'Ko data.
* src/autofit/afblue.dat: Add blue zone data for Adlam.
* src/autofit/afblue.c, src/autofit/afblue.h: Regenerated.
* src/autofit/afscript.h: Add Adlam standard characters.
* src/autofit/afranges.c, src/autofit/afstyles.h: Add Adlam data.
* src/autofit/afblue.dat: Add blue zone data for Ol Chiki.
* src/autofit/afblue.c, src/autofit/afblue.h: Regenerated.
* src/autofit/afscript.h: Add Ol Chiki standard character.
* src/autofit/afranges.c, src/autofit/afstyles.h: Add Ol Chiki data.
* src/autofit/afcjk.c, src/autofit/afindic.c: Include `afcjk.h'
earlier.
* src/sfnt/sfobjs.c (sfnt_init_face): Put `memory' variable into
TT_CONFIG_OPTION_GX_VAR_SUPPORT block.
(sfnt_done_face): Protect some code with
TT_CONFIG_OPTION_GX_VAR_SUPPORT.
* src/sfnt/ttsbit.c (tt_face_load_sbix_image): Remove compiler
warning.
* src/truetype/ttgload.c (TT_Load_Simple_Glyph): Put `tmp' variable
into TT_USE_BYTECODE_INTERPRETER block.
(tt_loader_init): Put `error' variable into
TT_USE_BYTECODE_INTERPRETER block.
Problem reported as
https://github.com/google/fonts/issues/632
The font in question (Nunito) has values 705 and 713 for the
reference and overshoot values, respectively, of the first blue
zone. Blue zone 2, however, has value 710 for both the reference
and overshoot. At 12ppem, reference and overshoot of blue zone 0
becomes 8px, while blue zone 2 becomes 9px.
A peculiarity of this font is that the tops of isolated vertical
stems like `N' have a slight overshoot also. The auto-hinter tries
to find the nearest blue zone using the *original* coordinates. For
vertical stems, this is value 713. For normal horizontal tops like
in character `E', this is value 710. Since value 713 is mapped to
8px but value 710 to 9px, `N' and similar characters are one pixel
higher than `E', which looks very bad.
This commit sanitizes blue zones to avoid such a behaviour.
* src/autofit/aflatin.c (af_latin_sort_blue): New function.
(af_latin_metrics_init_blues): Sort blue values and remove overlaps.
The number of lowercase characters for computing the top flat blue
zone value was too small (in most cases only `x' and `z'). If one
of the two characters has a large serif, say, it can happen that
FreeType must select between two different values, having a 50%
chance to use the wrong one. As a result, rendering at larger PPEM
values could yield uneven lowercase glyph heights.
Problem reported by Christoph Koeberlin <christoph@koe.berlin>.
* src/autofit/afblue.dat (AF_BLUE_STRING_LATIN_SMALL): Replaced
with...
(AF_BLUE_STRING_LATIN_SMALL_TOP, AF_BLUE_STRING_LATIN_SMALL_BOTTOM):
... New, extended sets.
(AF_BLUE_STRINGSET_LATN): Updated.
* src/autofit/afblue.c, scr/autofit/afblue.h: Regenerated.
Function calls through pointers must use a matching signature to
work on Emscripten, since such calls are dispatched through lookup
tables grouped by signature.
* src/autofit/aftypes.h (AF_WritingSystem_ApplyHintsFunc): Fix
typedef.
Also improve some comments and remove unused code.
No functional change.
* src/autofit/afloader.c (af_loader_load_g): Merged with...
(af_loader_load_glyph): ...this function.
Split off emboldening code into...
(af_loader_embolden_glyph_in_slot): ... this function.
Thanks to Hrant H Papazian <hpapazian@gmail.com> for help.
* src/autofit/afblue.dat (AF_BLUE_STRING_ARMENIAN_*): Improve
selection of characters.
* src/autofit/afblue.c, src/autofit/afblue.h: Regenerated.
* src/autofit/afhints.c (af_glyph_hints_dump_segments): Trace
`delta' also.
Don't show first point of segment as a replacement for `pos'; this
is (a) misleading, since the difference to `pos' can be almost
arbitrarily large in corner cases, and (b) it is better to have all
segment data in font units instead of a single value given in output
space coordinates.
Improve layout.
(af_glyph_hints_dump_edges): Show px->units and units->px conversion
values for convenience.
Improve layout.
* src/autofit/afhints.h (AF_SegmentRec): New member `delta'.
* src/autofit/aflatin.c (af_latin_hints_compute_segments): Compute
`delta'.
(af_latin_hints_compute_edges): Reject segments with a delta larger
than 0.5px.
This commit covers the most important one.
* src/autofit/afmodule.c (af_property_set): Handle `warping',
`darkening-parameters', and `no-stem-darkening'.
* src/cff/cffdrivr.c (cff_property_set): Handle
`darkening-parameters', `hinting-engine', and `no-stem-darkening'.
* src/truetype/ttdriver.c (tt_property_set): Handle
`interpreter-version'.
This is a preparation for handling an `FREETYPE_PROPERTIES'
environment variable to control (some) driver properties.
No change in functionality.
* src/base/ftobjs.c (ft_property_do): Add `value_is_string'
parameter.
(ft_property_string_set): New function.
(FT_Property_Set, FT_Property_Get): Updated.
* include/freetype/internal/ftobjs.h: Updated.
* include/freetype/internal/services/svprop.h
(FT_Properties_SetFunc): Add `value_is_string' parameter.
* src/autofit/afmodule.c (af_property_set), src/cff/cffdrivr.c
(cff_property_set), src/truetype/ttdriver.c (tt_property_set):
Updated, emitting an error currently if `value_is_string' is set.
Doing so allows us to link them to edges – some fonts like
`NotoSansGurmukhi-Regular' have such isolated points sitting exactly
on other outlines.
* src/autofit/aflatin.c (af_latin_hints_compute_segments): Don't
ignore one-point contours but handle them specially as one-point
segments.
(af_latin_hints_compute_edges): Append one-point segments to edges
if possible.
