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Diffstat (limited to 'thirdparty/harfbuzz/src/hb-subset.cc')
-rw-r--r--thirdparty/harfbuzz/src/hb-subset.cc87
1 files changed, 48 insertions, 39 deletions
diff --git a/thirdparty/harfbuzz/src/hb-subset.cc b/thirdparty/harfbuzz/src/hb-subset.cc
index 4588268b76..31ddb4f894 100644
--- a/thirdparty/harfbuzz/src/hb-subset.cc
+++ b/thirdparty/harfbuzz/src/hb-subset.cc
@@ -79,12 +79,14 @@ using OT::Layout::GSUB::GSUB;
*/
static unsigned
-_plan_estimate_subset_table_size (hb_subset_plan_t *plan, unsigned table_len)
+_plan_estimate_subset_table_size (hb_subset_plan_t *plan,
+ unsigned table_len,
+ bool same_size)
{
unsigned src_glyphs = plan->source->get_num_glyphs ();
unsigned dst_glyphs = plan->glyphset ()->get_population ();
- if (unlikely (!src_glyphs))
+ if (unlikely (!src_glyphs) || same_size)
return 512 + table_len;
return 512 + (unsigned) (table_len * sqrt ((double) dst_glyphs / src_glyphs));
@@ -123,7 +125,6 @@ static
bool
_try_subset (const TableType *table,
hb_vector_t<char>* buf,
- unsigned buf_size,
hb_subset_context_t* c /* OUT */)
{
c->serializer->start_serialize<TableType> ();
@@ -136,7 +137,8 @@ _try_subset (const TableType *table,
return needed;
}
- buf_size += (buf_size >> 1) + 32;
+ unsigned buf_size = buf->allocated;
+ buf_size = buf_size * 2 + 16;
DEBUG_MSG (SUBSET, nullptr, "OT::%c%c%c%c ran out of room; reallocating to %u bytes.",
HB_UNTAG (c->table_tag), buf_size);
@@ -147,13 +149,13 @@ _try_subset (const TableType *table,
return needed;
}
- c->serializer->reset (buf->arrayZ, buf_size);
- return _try_subset (table, buf, buf_size, c);
+ c->serializer->reset (buf->arrayZ, buf->allocated);
+ return _try_subset (table, buf, c);
}
template<typename TableType>
static bool
-_subset (hb_subset_plan_t *plan)
+_subset (hb_subset_plan_t *plan, hb_vector_t<char> &buf)
{
hb_blob_t *source_blob = hb_sanitize_context_t ().reference_table<TableType> (plan->source);
const TableType *table = source_blob->as<TableType> ();
@@ -167,10 +169,13 @@ _subset (hb_subset_plan_t *plan)
return false;
}
- hb_vector_t<char> buf;
- /* TODO Not all tables are glyph-related. 'name' table size for example should not be
- * affected by number of glyphs. Accommodate that. */
- unsigned buf_size = _plan_estimate_subset_table_size (plan, source_blob->length);
+ /* Tables that we want to allocate same space as the source table. For GSUB/GPOS it's
+ * because those are expensive to subset, so giving them more room is fine. */
+ bool same_size_table = TableType::tableTag == HB_OT_TAG_GSUB ||
+ TableType::tableTag == HB_OT_TAG_GPOS ||
+ TableType::tableTag == HB_OT_TAG_name;
+
+ unsigned buf_size = _plan_estimate_subset_table_size (plan, source_blob->length, same_size_table);
DEBUG_MSG (SUBSET, nullptr,
"OT::%c%c%c%c initial estimated table size: %u bytes.", HB_UNTAG (tag), buf_size);
if (unlikely (!buf.alloc (buf_size)))
@@ -181,10 +186,10 @@ _subset (hb_subset_plan_t *plan)
}
bool needed = false;
- hb_serialize_context_t serializer (buf.arrayZ, buf_size);
+ hb_serialize_context_t serializer (buf.arrayZ, buf.allocated);
{
hb_subset_context_t c (source_blob, plan, &serializer, tag);
- needed = _try_subset (table, &buf, buf_size, &c);
+ needed = _try_subset (table, &buf, &c);
}
hb_blob_destroy (source_blob);
@@ -274,7 +279,9 @@ _passthrough (hb_subset_plan_t *plan, hb_tag_t tag)
}
static bool
-_subset_table (hb_subset_plan_t *plan, hb_tag_t tag)
+_subset_table (hb_subset_plan_t *plan,
+ hb_vector_t<char> &buf,
+ hb_tag_t tag)
{
if (plan->no_subset_tables->has (tag)) {
return _passthrough (plan, tag);
@@ -283,42 +290,42 @@ _subset_table (hb_subset_plan_t *plan, hb_tag_t tag)
DEBUG_MSG (SUBSET, nullptr, "subset %c%c%c%c", HB_UNTAG (tag));
switch (tag)
{
- case HB_OT_TAG_glyf: return _subset<const OT::glyf> (plan);
- case HB_OT_TAG_hdmx: return _subset<const OT::hdmx> (plan);
- case HB_OT_TAG_name: return _subset<const OT::name> (plan);
+ case HB_OT_TAG_glyf: return _subset<const OT::glyf> (plan, buf);
+ case HB_OT_TAG_hdmx: return _subset<const OT::hdmx> (plan, buf);
+ case HB_OT_TAG_name: return _subset<const OT::name> (plan, buf);
case HB_OT_TAG_head:
if (_is_table_present (plan->source, HB_OT_TAG_glyf) && !_should_drop_table (plan, HB_OT_TAG_glyf))
return true; /* skip head, handled by glyf */
- return _subset<const OT::head> (plan);
+ return _subset<const OT::head> (plan, buf);
case HB_OT_TAG_hhea: return true; /* skip hhea, handled by hmtx */
- case HB_OT_TAG_hmtx: return _subset<const OT::hmtx> (plan);
+ case HB_OT_TAG_hmtx: return _subset<const OT::hmtx> (plan, buf);
case HB_OT_TAG_vhea: return true; /* skip vhea, handled by vmtx */
- case HB_OT_TAG_vmtx: return _subset<const OT::vmtx> (plan);
- case HB_OT_TAG_maxp: return _subset<const OT::maxp> (plan);
- case HB_OT_TAG_sbix: return _subset<const OT::sbix> (plan);
+ case HB_OT_TAG_vmtx: return _subset<const OT::vmtx> (plan, buf);
+ case HB_OT_TAG_maxp: return _subset<const OT::maxp> (plan, buf);
+ case HB_OT_TAG_sbix: return _subset<const OT::sbix> (plan, buf);
case HB_OT_TAG_loca: return true; /* skip loca, handled by glyf */
- case HB_OT_TAG_cmap: return _subset<const OT::cmap> (plan);
- case HB_OT_TAG_OS2 : return _subset<const OT::OS2 > (plan);
- case HB_OT_TAG_post: return _subset<const OT::post> (plan);
- case HB_OT_TAG_COLR: return _subset<const OT::COLR> (plan);
- case HB_OT_TAG_CPAL: return _subset<const OT::CPAL> (plan);
- case HB_OT_TAG_CBLC: return _subset<const OT::CBLC> (plan);
+ case HB_OT_TAG_cmap: return _subset<const OT::cmap> (plan, buf);
+ case HB_OT_TAG_OS2 : return _subset<const OT::OS2 > (plan, buf);
+ case HB_OT_TAG_post: return _subset<const OT::post> (plan, buf);
+ case HB_OT_TAG_COLR: return _subset<const OT::COLR> (plan, buf);
+ case HB_OT_TAG_CPAL: return _subset<const OT::CPAL> (plan, buf);
+ case HB_OT_TAG_CBLC: return _subset<const OT::CBLC> (plan, buf);
case HB_OT_TAG_CBDT: return true; /* skip CBDT, handled by CBLC */
- case HB_OT_TAG_MATH: return _subset<const OT::MATH> (plan);
+ case HB_OT_TAG_MATH: return _subset<const OT::MATH> (plan, buf);
#ifndef HB_NO_SUBSET_CFF
- case HB_OT_TAG_cff1: return _subset<const OT::cff1> (plan);
- case HB_OT_TAG_cff2: return _subset<const OT::cff2> (plan);
- case HB_OT_TAG_VORG: return _subset<const OT::VORG> (plan);
+ case HB_OT_TAG_cff1: return _subset<const OT::cff1> (plan, buf);
+ case HB_OT_TAG_cff2: return _subset<const OT::cff2> (plan, buf);
+ case HB_OT_TAG_VORG: return _subset<const OT::VORG> (plan, buf);
#endif
#ifndef HB_NO_SUBSET_LAYOUT
- case HB_OT_TAG_GDEF: return _subset<const OT::GDEF> (plan);
- case HB_OT_TAG_GSUB: return _subset<const GSUB> (plan);
- case HB_OT_TAG_GPOS: return _subset<const OT::GPOS> (plan);
- case HB_OT_TAG_gvar: return _subset<const OT::gvar> (plan);
- case HB_OT_TAG_HVAR: return _subset<const OT::HVAR> (plan);
- case HB_OT_TAG_VVAR: return _subset<const OT::VVAR> (plan);
+ case HB_OT_TAG_GDEF: return _subset<const OT::GDEF> (plan, buf);
+ case HB_OT_TAG_GSUB: return _subset<const GSUB> (plan, buf);
+ case HB_OT_TAG_GPOS: return _subset<const OT::GPOS> (plan, buf);
+ case HB_OT_TAG_gvar: return _subset<const OT::gvar> (plan, buf);
+ case HB_OT_TAG_HVAR: return _subset<const OT::HVAR> (plan, buf);
+ case HB_OT_TAG_VVAR: return _subset<const OT::VVAR> (plan, buf);
#endif
default:
@@ -379,6 +386,8 @@ hb_subset_plan_execute_or_fail (hb_subset_plan_t *plan)
bool success = true;
hb_tag_t table_tags[32];
unsigned offset = 0, num_tables = ARRAY_LENGTH (table_tags);
+ hb_vector_t<char> buf;
+ buf.alloc (4096 - 16);
while ((hb_face_get_table_tags (plan->source, offset, &num_tables, table_tags), num_tables))
{
for (unsigned i = 0; i < num_tables; ++i)
@@ -386,7 +395,7 @@ hb_subset_plan_execute_or_fail (hb_subset_plan_t *plan)
hb_tag_t tag = table_tags[i];
if (_should_drop_table (plan, tag) && !tags_set.has (tag)) continue;
tags_set.add (tag);
- success = _subset_table (plan, tag);
+ success = _subset_table (plan, buf, tag);
if (unlikely (!success)) goto end;
}
offset += num_tables;
generated by cgit v1.2.3 (git 2.25.1) at 2025-01-03 23:18:40 +0000