[hmtx/vmtx] >64k expansion
#7
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behdad
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Overview of changes leading to 4.0.0 Tuesday, March 1, 2022 ==================================== - New public API to create subset plan and gather information on things like glyph mappings in the final subset. The plan can then be passed on to perform the subsetting operation. (Garret Rieger) - Draw API for extracting glyph shapes have been extended and finalized and is no longer an experimental API. The draw API supports glyf, CFF and CFF2 glyph outlines tables, and applies variation settings set on the font as well as synthetic slant. The new public API is not backward compatible with the previous, non-public, experimental API. (Behdad Esfahbod) - The hb-view tool will use HarfBuzz draw API to render the glyphs instead of cairo-ft when compiled with Cairo 1.17.5 or newer, setting HB_DRAW environment variable to 1 or 0 will force using or not use the draw API, respectively. (Behdad Esfahbod) - The hb-shape and hb-view tools now default to using HarfBuzz’s own font loading functions (ot) instead of FreeType ones (ft). They also have a new option, --font-slant, to apply synthetic slant to the font. (Behdad Esfahbod) - HarfBuzz now supports more than 65535 (the OpenType limit) glyph shapes and metrics. See harfbuzz/boring-expansion-spec#6 and harfbuzz/boring-expansion-spec#7 for details. (Behdad Esfahbod) - New API to get the dominant horizontal baseline tag for a given script. (Behdad Esfahbod) - New API to get the baseline positions from the font, and synthesize missing ones. As well as new API to get font metrics and synthesize missing ones. (Matthias Clasen) - Improvements to finding dependencies on Windows when building with Visual Studio. (Chun-wei Fan) - New buffer flag, HB_BUFFER_FLAG_PRODUCE_UNSAFE_TO_CONCAT, that must be set during shaping for HB_GLYPH_FLAG_UNSAFE_TO_CONCAT flag to be reliably produced. This is to limit the performance hit of producing this flag to when it is actually needed. (Behdad Esfahbod) - Documentation improvements. (Matthias Clasen)
mtremer
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- Update from 3.4.0 to 4.2.0
- Update of rootfile
- Changelog
Overview of changes leading to 4.2.0
Wednesday, March 30, 2022
- Source code reorganization, splitting large hb-ot-layout files into smaller,
per-subtable ones under OT/Layout/*. Code for more tables will follow suit in
later releases. (Garret Rieger, Behdad Esfahbod)
- Revert Indic shaper change in previous release that broke some fonts and
instead make per-syllable restriction of “GSUB” application limited to
script-specific Indic features, while applying them and discretionary
features in one go. (Behdad Esfahbod)
- Fix decoding of private in gvar table. (Behdad Esfahbod)
- Fix handling of contextual lookups that delete too many glyphs. (Behdad Esfahbod)
- Make “morx” deleted glyphs don’t block “GPOS” application. (Behdad Esfahbod)
- Various build fixes. (Chun-wei Fan, Khaled Hosny)
- New API
+hb_set_next_many() (Andrew John)
Overview of changes leading to 4.1.0
Wednesday, March 23, 2022
- Various OSS-Fuzz fixes. (Behdad Esfahbod)
- Make fallback vertical-origin match FreeType’s. (Behdad Esfahbod)
- Treat visible viramas like dependent vowels in USE shaper. (David Corbett)
- Apply presentation forms features and discretionary features in one go in
Indic shaper, which seems to match Uniscribe and CoreText behaviour.
(Behdad Esfahbod, David Corbett)
- Various bug fixes.
- New API
+hb_set_add_sorted_array() (Andrew John)
Overview of changes leading to 4.0.1
Friday, March 11, 2022
- Update OpenType to AAT mappings for “hist” and “vrtr” features.
(Florian Pircher)
- Update IANA Language Subtag Registry to 2022-03-02. (David Corbett)
- Update USE shaper to allow any non-numeric tail in a symbol cluster, and
remove obsolete data overrides. (David Corbett)
- Fix handling of baseline variations to return correctly scaled values.
(Matthias Clasen)
- A new experimental hb_subset_repack_or_fail() to repack an array of objects,
eliminating offset overflows. The API is not available unless HarfBuzz is
built with experimental APIs enabled. (Qunxin Liu)
- New experimental API
+hb_link_t
+hb_object_t
+hb_subset_repack_or_fail()
Overview of changes leading to 4.0.0
Tuesday, March 1, 2022
- New public API to create subset plan and gather information on things like
glyph mappings in the final subset. The plan can then be passed on to perform
the subsetting operation. (Garret Rieger)
- Draw API for extracting glyph shapes have been extended and finalized and is
no longer an experimental API. The draw API supports glyf, CFF and CFF2
glyph outlines tables, and applies variation settings set on the font as well
as synthetic slant. The new public API is not backward compatible with the
previous, non-public, experimental API. (Behdad Esfahbod)
- The hb-view tool will use HarfBuzz draw API to render the glyphs instead of
cairo-ft when compiled with Cairo 1.17.5 or newer, setting HB_DRAW
environment variable to 1 or 0 will force using or not use the draw API,
respectively. (Behdad Esfahbod)
- The hb-shape and hb-view tools now default to using HarfBuzz’s own font
loading functions (ot) instead of FreeType ones (ft). They also have a new
option, --font-slant, to apply synthetic slant to the font. (Behdad Esfahbod)
- HarfBuzz now supports more than 65535 (the OpenType limit) glyph shapes and
metrics. See harfbuzz/boring-expansion-spec#6 and
harfbuzz/boring-expansion-spec#7 for details.
(Behdad Esfahbod)
- New API to get the dominant horizontal baseline tag for a given script.
(Behdad Esfahbod)
- New API to get the baseline positions from the font, and synthesize missing
ones. As well as new API to get font metrics and synthesize missing ones.
(Matthias Clasen)
- Improvements to finding dependencies on Windows when building with Visual
Studio. (Chun-wei Fan)
- New buffer flag, HB_BUFFER_FLAG_PRODUCE_UNSAFE_TO_CONCAT, that must be set
during shaping for HB_GLYPH_FLAG_UNSAFE_TO_CONCAT flag to be reliably
produced. This is to limit the performance hit of producing this flag to when
it is actually needed. (Behdad Esfahbod)
- Documentation improvements. (Matthias Clasen)
- New API
- General:
+HB_BUFFER_FLAG_PRODUCE_UNSAFE_TO_CONCAT
+hb_var_num_t
- Draw:
+hb_draw_funcs_t
+hb_draw_funcs_create()
+hb_draw_funcs_reference()
+hb_draw_funcs_destroy()
+hb_draw_funcs_is_immutable()
+hb_draw_funcs_make_immutable()
+hb_draw_move_to_func_t
+hb_draw_funcs_set_move_to_func()
+hb_draw_line_to_func_t
+hb_draw_funcs_set_line_to_func()
+hb_draw_quadratic_to_func_t
+hb_draw_funcs_set_quadratic_to_func()
+hb_draw_cubic_to_func_t
+hb_draw_funcs_set_cubic_to_func()
+hb_draw_close_path_func_t
+hb_draw_funcs_set_close_path_func()
+hb_draw_state_t
+HB_DRAW_STATE_DEFAULT
+hb_draw_move_to()
+hb_draw_line_to()
+hb_draw_quadratic_to()
+hb_draw_cubic_to()
+hb_draw_close_path()
+hb_font_get_glyph_shape_func_t
+hb_font_funcs_set_glyph_shape_func()
+hb_font_get_glyph_shape()
- OpenType layout
+HB_OT_LAYOUT_BASELINE_TAG_IDEO_FACE_CENTRAL
+HB_OT_LAYOUT_BASELINE_TAG_IDEO_EMBOX_CENTRAL
+hb_ot_layout_get_horizontal_baseline_tag_for_script()
+hb_ot_layout_get_baseline_with_fallback()
- Metrics:
+hb_ot_metrics_get_position_with_fallback()
- Subset:
+hb_subset_plan_t
+hb_subset_plan_create_or_fail()
+hb_subset_plan_reference()
+hb_subset_plan_destroy()
+hb_subset_plan_set_user_data()
+hb_subset_plan_get_user_data()
+hb_subset_plan_execute_or_fail()
+hb_subset_plan_unicode_to_old_glyph_mapping()
+hb_subset_plan_new_to_old_glyph_mapping()
+hb_subset_plan_old_to_new_glyph_mapping()
Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
behdad
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Jul 3, 2022
Implements harfbuzz/boring-expansion-spec#7 Optimization not implemented.
behdad
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Jul 8, 2022
Implements harfbuzz/boring-expansion-spec#7 Optimization not implemented.
behdad
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Jul 12, 2022
behdad
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behdad
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Jul 12, 2022
Implements harfbuzz/boring-expansion-spec#7 Optimization not implemented.
behdad
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Jul 12, 2022
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Speced: https://github.com/harfbuzz/boring-expansion-spec/blob/main/beyond-64k.md |
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But this algorithm is completely different from that used by every other font processor in existence today - which means it will break compatibility with all those other tools....and that doesn't seem like a reasonable approach. |
It's not completely different. If gid is less than Can you elaborate what problem you see with this? |
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You are assuming that all the processor does is to index into the array - it doesn't copy or evaluate the bytes of the Certainly, any software doing data validation will fail because the Why not simply leave the |
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I think an older font sanitizer failing against a newer font format is naturally expected.
That's possible, but I don't see the problem with what I'm proposing. You can make the same argument about extending any table. With your argument we cannot extend anything. |
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I talk about
hmtxonly.vmtxcase is similar.Currently
hmtxtable length is determined byhhea/maxpin the following way:hhea.metricDataFormatis required to be 0 for current format;hmtxis required to be2 * hhea.numberOfHMetrics + 2 * maxp.numGlyphsbytes long.The rest of this issue describes how we relax the second requirement, to allow encoding advance width of arbitrary number of glyphs in
hmtxtable, regardless of the value ofmaxp.numGlyphs.This is how an advance width is assigned to every glyph index beyond
maxp.numGlyphs:Bbe the excess bytes at the end of thehmtxtable beyond2 * hhea.numberOfHMetrics + 2 * maxp.numGlyphsbytes.Bis odd, ignore the last byte ofB.Bas an array of big-endian uint16 advance-width numbers of glyph indices starting atmaxp.numGlyphs. For any glyph index that is in range in the font but out of range in this array, use the last item of the array.The text was updated successfully, but these errors were encountered: