[glyf] Split SubsetGlyph
This commit is contained in:
Behdad Esfahbod
parent
0031069f47
commit
ae75f066b5
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@ -91,6 +91,7 @@ HB_BASE_sources = \
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OT/glyf/glyf.hh \
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OT/glyf/loca.hh \
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OT/glyf/Glyph.hh \
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OT/glyf/SubsetGlyph.hh \
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OT/Layout/GSUB/Common.hh \
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OT/Layout/GSUB/Sequence.hh \
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OT/Layout/GSUB/SingleSubstFormat1.hh \
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@ -0,0 +1,70 @@
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#ifndef OT_GLYF_SUBSETGLYPH_HH
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#define OT_GLYF_SUBSETGLYPH_HH
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#include "../../hb-open-type.hh"
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namespace OT {
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struct SubsetGlyph
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{
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hb_codepoint_t new_gid;
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hb_codepoint_t old_gid;
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Glyph source_glyph;
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hb_bytes_t dest_start; /* region of source_glyph to copy first */
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hb_bytes_t dest_end; /* region of source_glyph to copy second */
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bool serialize (hb_serialize_context_t *c,
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bool use_short_loca,
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const hb_subset_plan_t *plan) const
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{
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TRACE_SERIALIZE (this);
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hb_bytes_t dest_glyph = dest_start.copy (c);
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dest_glyph = hb_bytes_t (&dest_glyph, dest_glyph.length + dest_end.copy (c).length);
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unsigned int pad_length = use_short_loca ? padding () : 0;
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DEBUG_MSG (SUBSET, nullptr, "serialize %d byte glyph, width %d pad %d", dest_glyph.length, dest_glyph.length + pad_length, pad_length);
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HBUINT8 pad;
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pad = 0;
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while (pad_length > 0)
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{
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c->embed (pad);
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pad_length--;
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}
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if (unlikely (!dest_glyph.length)) return_trace (true);
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/* update components gids */
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for (auto &_ : Glyph (dest_glyph).get_composite_iterator ())
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{
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hb_codepoint_t new_gid;
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if (plan->new_gid_for_old_gid (_.get_glyph_index (), &new_gid))
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const_cast<CompositeGlyphChain &> (_).set_glyph_index (new_gid);
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}
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if (plan->flags & HB_SUBSET_FLAGS_NO_HINTING)
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Glyph (dest_glyph).drop_hints ();
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if (plan->flags & HB_SUBSET_FLAGS_SET_OVERLAPS_FLAG)
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Glyph (dest_glyph).set_overlaps_flag ();
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return_trace (true);
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}
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void drop_hints_bytes ()
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{ source_glyph.drop_hints_bytes (dest_start, dest_end); }
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unsigned int length () const { return dest_start.length + dest_end.length; }
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/* pad to 2 to ensure 2-byte loca will be ok */
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unsigned int padding () const { return length () % 2; }
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unsigned int padded_size () const { return length () + padding (); }
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};
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} /* namespace OT */
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#endif /* OT_GLYF_SUBSETGLYPH_HH */
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@ -9,6 +9,7 @@
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#include "../../hb-draw.hh"
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#include "Glyph.hh"
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#include "SubsetGlyph.hh"
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#include "loca.hh"
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@ -166,61 +167,6 @@ struct glyf
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return success;
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}
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struct SubsetGlyph
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{
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hb_codepoint_t new_gid;
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hb_codepoint_t old_gid;
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Glyph source_glyph;
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hb_bytes_t dest_start; /* region of source_glyph to copy first */
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hb_bytes_t dest_end; /* region of source_glyph to copy second */
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bool serialize (hb_serialize_context_t *c,
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bool use_short_loca,
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const hb_subset_plan_t *plan) const
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{
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TRACE_SERIALIZE (this);
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hb_bytes_t dest_glyph = dest_start.copy (c);
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dest_glyph = hb_bytes_t (&dest_glyph, dest_glyph.length + dest_end.copy (c).length);
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unsigned int pad_length = use_short_loca ? padding () : 0;
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DEBUG_MSG (SUBSET, nullptr, "serialize %d byte glyph, width %d pad %d", dest_glyph.length, dest_glyph.length + pad_length, pad_length);
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HBUINT8 pad;
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pad = 0;
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while (pad_length > 0)
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{
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c->embed (pad);
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pad_length--;
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}
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if (unlikely (!dest_glyph.length)) return_trace (true);
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/* update components gids */
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for (auto &_ : Glyph (dest_glyph).get_composite_iterator ())
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{
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hb_codepoint_t new_gid;
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if (plan->new_gid_for_old_gid (_.get_glyph_index (), &new_gid))
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const_cast<CompositeGlyphChain &> (_).set_glyph_index (new_gid);
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}
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if (plan->flags & HB_SUBSET_FLAGS_NO_HINTING)
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Glyph (dest_glyph).drop_hints ();
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if (plan->flags & HB_SUBSET_FLAGS_SET_OVERLAPS_FLAG)
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Glyph (dest_glyph).set_overlaps_flag ();
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return_trace (true);
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}
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void drop_hints_bytes ()
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{ source_glyph.drop_hints_bytes (dest_start, dest_end); }
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unsigned int length () const { return dest_start.length + dest_end.length; }
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/* pad to 2 to ensure 2-byte loca will be ok */
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unsigned int padding () const { return length () % 2; }
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unsigned int padded_size () const { return length () + padding (); }
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};
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void
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_populate_subset_glyphs (const hb_subset_plan_t *plan,
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hb_vector_t<SubsetGlyph> *glyphs /* OUT */) const;
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@ -95,6 +95,7 @@ hb_base_sources = files(
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'OT/glyf/glyf.hh',
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'OT/glyf/loca.hh',
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'OT/glyf/Glyph.hh',
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'OT/glyf/SubsetGlyph.hh',
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'OT/Layout/GSUB/Common.hh',
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'OT/Layout/GSUB/Sequence.hh',
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'OT/Layout/GSUB/SingleSubstFormat1.hh',
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