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[beyond-64k] Implement gvar support 

https://github.com/harfbuzz/boring-expansion-spec/issues/85
This commit is contained in:
Behdad Esfahbod 2023-03-07 14:23:39 -07:00
parent f325aba561
commit ea17c7a81a
1 changed files with 24 additions and 14 deletions
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38
src/hb-ot-var-gvar-table.hh
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@ -104,8 +104,8 @@ struct gvar
return_trace (c->check_struct (this) && (version.major == 1) &&
sharedTuples.sanitize (c, this, axisCount * sharedTupleCount) &&
(is_long_offset () ?
c->check_array (get_long_offset_array (), glyphCount+1) :
c->check_array (get_short_offset_array (), glyphCount+1)));
c->check_array (get_long_offset_array (), c->get_num_glyphs () + 1) :
c->check_array (get_short_offset_array (), c->get_num_glyphs () + 1)));
}
/* GlyphVariationData not sanitized here; must be checked while accessing each glyph variation data */
@ -116,6 +116,8 @@ struct gvar
{
TRACE_SUBSET (this);
unsigned glyph_count = c->plan->source->get_num_glyphs ();
gvar *out = c->serializer->allocate_min<gvar> ();
if (unlikely (!out)) return_trace (false);
@ -125,7 +127,7 @@ struct gvar
out->sharedTupleCount = sharedTupleCount;
unsigned int num_glyphs = c->plan->num_output_glyphs ();
out->glyphCount = num_glyphs;
out->glyphCountX = hb_min (0xFFFFu, num_glyphs);
unsigned int subset_data_size = 0;
for (hb_codepoint_t gid = (c->plan->flags & HB_SUBSET_FLAGS_NOTDEF_OUTLINE) ? 0 : 1;
@ -134,7 +136,7 @@ struct gvar
{
hb_codepoint_t old_gid;
if (!c->plan->old_gid_for_new_gid (gid, &old_gid)) continue;
subset_data_size += get_glyph_var_data_bytes (c->source_blob, old_gid).length;
subset_data_size += get_glyph_var_data_bytes (c->source_blob, glyph_count, old_gid).length;
}
bool long_offset = subset_data_size & ~0xFFFFu;
@ -166,7 +168,9 @@ struct gvar
{
hb_codepoint_t old_gid;
hb_bytes_t var_data_bytes = c->plan->old_gid_for_new_gid (gid, &old_gid)
? get_glyph_var_data_bytes (c->source_blob, old_gid)
? get_glyph_var_data_bytes (c->source_blob,
glyph_count,
old_gid)
: hb_bytes_t ();
if (long_offset)
@ -188,10 +192,12 @@ struct gvar
}
protected:
const hb_bytes_t get_glyph_var_data_bytes (hb_blob_t *blob, hb_codepoint_t glyph) const
const hb_bytes_t get_glyph_var_data_bytes (hb_blob_t *blob,
unsigned glyph_count,
hb_codepoint_t glyph) const
{
unsigned start_offset = get_offset (glyph);
unsigned end_offset = get_offset (glyph+1);
unsigned start_offset = get_offset (glyph_count, glyph);
unsigned end_offset = get_offset (glyph_count, glyph+1);
if (unlikely (end_offset < start_offset)) return hb_bytes_t ();
unsigned length = end_offset - start_offset;
hb_bytes_t var_data = blob->as_bytes ().sub_array (((unsigned) dataZ) + start_offset, length);
@ -200,9 +206,9 @@ struct gvar
bool is_long_offset () const { return flags & 1; }
unsigned get_offset (unsigned i) const
unsigned get_offset (unsigned glyph_count, unsigned i) const
{
if (unlikely (i > glyphCount)) return 0;
if (unlikely (i > glyph_count)) return 0;
_hb_compiler_memory_r_barrier ();
return is_long_offset () ? get_long_offset_array ()[i] : get_short_offset_array ()[i] * 2;
}
@ -214,7 +220,10 @@ struct gvar
struct accelerator_t
{
accelerator_t (hb_face_t *face)
{ table = hb_sanitize_context_t ().reference_table<gvar> (face); }
{
table = hb_sanitize_context_t ().reference_table<gvar> (face);
glyphCount = face->get_num_glyphs ();
}
~accelerator_t () { table.destroy (); }
private:
@ -252,9 +261,9 @@ struct gvar
{
if (!coords) return true;
if (unlikely (glyph >= table->glyphCount)) return true;
if (unlikely (glyph >= glyphCount)) return true;
hb_bytes_t var_data_bytes = table->get_glyph_var_data_bytes (table.get_blob (), glyph);
hb_bytes_t var_data_bytes = table->get_glyph_var_data_bytes (table.get_blob (), glyphCount, glyph);
if (!var_data_bytes.as<GlyphVariationData> ()->has_data ()) return true;
hb_vector_t<unsigned int> shared_indices;
GlyphVariationData::tuple_iterator_t iterator;
@ -403,6 +412,7 @@ struct gvar
private:
hb_blob_ptr_t<gvar> table;
unsigned glyphCount;
};
protected:
@ -418,7 +428,7 @@ struct gvar
NNOffset32To<UnsizedArrayOf<F2DOT14>>
sharedTuples; /* Offset from the start of this table to the shared tuple records.
* Array of tuple records shared across all glyph variation data tables. */
HBUINT16 glyphCount; /* The number of glyphs in this font. This must match the number of
HBUINT16 glyphCountX; /* The number of glyphs in this font. This must match the number of
* glyphs stored elsewhere in the font. */
HBUINT16 flags; /* Bit-field that gives the format of the offset array that follows.
* If bit 0 is clear, the offsets are uint16; if bit 0 is set, the