[glyf] Split SubsetGlyph

This commit is contained in:
Behdad Esfahbod 2022-06-25 17:11:04 -06:00
parent 0031069f47
commit ae75f066b5
4 changed files with 73 additions and 55 deletions

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@ -91,6 +91,7 @@ HB_BASE_sources = \
OT/glyf/glyf.hh \
OT/glyf/loca.hh \
OT/glyf/Glyph.hh \
OT/glyf/SubsetGlyph.hh \
OT/Layout/GSUB/Common.hh \
OT/Layout/GSUB/Sequence.hh \
OT/Layout/GSUB/SingleSubstFormat1.hh \

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@ -0,0 +1,70 @@
#ifndef OT_GLYF_SUBSETGLYPH_HH
#define OT_GLYF_SUBSETGLYPH_HH
#include "../../hb-open-type.hh"
namespace OT {
struct SubsetGlyph
{
hb_codepoint_t new_gid;
hb_codepoint_t old_gid;
Glyph source_glyph;
hb_bytes_t dest_start; /* region of source_glyph to copy first */
hb_bytes_t dest_end; /* region of source_glyph to copy second */
bool serialize (hb_serialize_context_t *c,
bool use_short_loca,
const hb_subset_plan_t *plan) const
{
TRACE_SERIALIZE (this);
hb_bytes_t dest_glyph = dest_start.copy (c);
dest_glyph = hb_bytes_t (&dest_glyph, dest_glyph.length + dest_end.copy (c).length);
unsigned int pad_length = use_short_loca ? padding () : 0;
DEBUG_MSG (SUBSET, nullptr, "serialize %d byte glyph, width %d pad %d", dest_glyph.length, dest_glyph.length + pad_length, pad_length);
HBUINT8 pad;
pad = 0;
while (pad_length > 0)
{
c->embed (pad);
pad_length--;
}
if (unlikely (!dest_glyph.length)) return_trace (true);
/* update components gids */
for (auto &_ : Glyph (dest_glyph).get_composite_iterator ())
{
hb_codepoint_t new_gid;
if (plan->new_gid_for_old_gid (_.get_glyph_index (), &new_gid))
const_cast<CompositeGlyphChain &> (_).set_glyph_index (new_gid);
}
if (plan->flags & HB_SUBSET_FLAGS_NO_HINTING)
Glyph (dest_glyph).drop_hints ();
if (plan->flags & HB_SUBSET_FLAGS_SET_OVERLAPS_FLAG)
Glyph (dest_glyph).set_overlaps_flag ();
return_trace (true);
}
void drop_hints_bytes ()
{ source_glyph.drop_hints_bytes (dest_start, dest_end); }
unsigned int length () const { return dest_start.length + dest_end.length; }
/* pad to 2 to ensure 2-byte loca will be ok */
unsigned int padding () const { return length () % 2; }
unsigned int padded_size () const { return length () + padding (); }
};
} /* namespace OT */
#endif /* OT_GLYF_SUBSETGLYPH_HH */

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@ -9,6 +9,7 @@
#include "../../hb-draw.hh"
#include "Glyph.hh"
#include "SubsetGlyph.hh"
#include "loca.hh"
@ -166,61 +167,6 @@ struct glyf
return success;
}
struct SubsetGlyph
{
hb_codepoint_t new_gid;
hb_codepoint_t old_gid;
Glyph source_glyph;
hb_bytes_t dest_start; /* region of source_glyph to copy first */
hb_bytes_t dest_end; /* region of source_glyph to copy second */
bool serialize (hb_serialize_context_t *c,
bool use_short_loca,
const hb_subset_plan_t *plan) const
{
TRACE_SERIALIZE (this);
hb_bytes_t dest_glyph = dest_start.copy (c);
dest_glyph = hb_bytes_t (&dest_glyph, dest_glyph.length + dest_end.copy (c).length);
unsigned int pad_length = use_short_loca ? padding () : 0;
DEBUG_MSG (SUBSET, nullptr, "serialize %d byte glyph, width %d pad %d", dest_glyph.length, dest_glyph.length + pad_length, pad_length);
HBUINT8 pad;
pad = 0;
while (pad_length > 0)
{
c->embed (pad);
pad_length--;
}
if (unlikely (!dest_glyph.length)) return_trace (true);
/* update components gids */
for (auto &_ : Glyph (dest_glyph).get_composite_iterator ())
{
hb_codepoint_t new_gid;
if (plan->new_gid_for_old_gid (_.get_glyph_index (), &new_gid))
const_cast<CompositeGlyphChain &> (_).set_glyph_index (new_gid);
}
if (plan->flags & HB_SUBSET_FLAGS_NO_HINTING)
Glyph (dest_glyph).drop_hints ();
if (plan->flags & HB_SUBSET_FLAGS_SET_OVERLAPS_FLAG)
Glyph (dest_glyph).set_overlaps_flag ();
return_trace (true);
}
void drop_hints_bytes ()
{ source_glyph.drop_hints_bytes (dest_start, dest_end); }
unsigned int length () const { return dest_start.length + dest_end.length; }
/* pad to 2 to ensure 2-byte loca will be ok */
unsigned int padding () const { return length () % 2; }
unsigned int padded_size () const { return length () + padding (); }
};
void
_populate_subset_glyphs (const hb_subset_plan_t *plan,
hb_vector_t<SubsetGlyph> *glyphs /* OUT */) const;

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@ -95,6 +95,7 @@ hb_base_sources = files(
'OT/glyf/glyf.hh',
'OT/glyf/loca.hh',
'OT/glyf/Glyph.hh',
'OT/glyf/SubsetGlyph.hh',
'OT/Layout/GSUB/Common.hh',
'OT/Layout/GSUB/Sequence.hh',
'OT/Layout/GSUB/SingleSubstFormat1.hh',