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[subset] Keep head when no glyf table

This commit is contained in:
ckitagawa 2020-02-04 13:36:51 -05:00 committed by Ebrahim Byagowi
parent 7f9b2228a6
commit 0d61926ca7
4 changed files with 69 additions and 58 deletions
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12
src/hb-ot-cff1-table.hh
View File

@ -27,7 +27,6 @@
#ifndef HB_OT_CFF1_TABLE_HH
#define HB_OT_CFF1_TABLE_HH
#include "hb-ot-head-table.hh"
#include "hb-ot-cff-common.hh"
#include "hb-subset-cff1.hh"
@ -1378,16 +1377,7 @@ struct cff1
bool subset (hb_subset_context_t *c) const
{
bool success = true;
if (hb_subset_cff1 (c)) {
hb_blob_t *head_blob = hb_sanitize_context_t().reference_table<head> (c->plan->source);
success = success && head_blob && c->plan->add_table (HB_OT_TAG_head, head_blob);
hb_blob_destroy (head_blob);
} else {
success = false;
}
return success;
return hb_subset_cff1 (c);
}
protected:

12
src/hb-ot-cff2-table.hh
View File

@ -27,7 +27,6 @@
#ifndef HB_OT_CFF2_TABLE_HH
#define HB_OT_CFF2_TABLE_HH
#include "hb-ot-head-table.hh"
#include "hb-ot-cff-common.hh"
#include "hb-subset-cff2.hh"
@ -541,16 +540,7 @@ struct cff2
bool subset (hb_subset_context_t *c) const
{
bool success = true;
if (hb_subset_cff2 (c)) {
hb_blob_t *head_blob = hb_sanitize_context_t().reference_table<head> (c->plan->source);
success = success && head_blob && c->plan->add_table (HB_OT_TAG_head, head_blob);
hb_blob_destroy (head_blob);
} else {
success = false;
}
return success;
return hb_subset_cff2 (c);
}
public:

12
src/hb-ot-head-table.hh
View File

@ -54,6 +54,18 @@ struct head
return 16 <= upem && upem <= 16384 ? upem : 1000;
}
bool serialize (hb_serialize_context_t *c) const
{
TRACE_SERIALIZE (this);
return_trace ((bool) c->embed (this));
}
bool subset (hb_subset_context_t *c) const
{
TRACE_SUBSET (this);
return_trace (serialize (c->serializer));
}
enum mac_style_flag_t {
BOLD = 1u<<0,
ITALIC = 1u<<1,

91
src/hb-subset.cc
View File

@ -133,6 +133,53 @@ _subset (hb_subset_plan_t *plan)
return result;
}
static bool
_is_table_present (hb_face_t *source,
hb_tag_t tag)
{
unsigned tables = hb_face_get_table_tags (source, 0, nullptr, nullptr);
hb_vector_t<uint32_t> tags;
tags.resize (tables);
hb_face_get_table_tags (source, 0, &tables, tags.arrayZ);
for (unsigned int i = 0; i < tables; i++) {
if (tags[i] == tag)
return true;
}
return false;
}
static bool
_should_drop_table (hb_subset_plan_t *plan, hb_tag_t tag)
{
if (plan->drop_tables->has (tag))
return true;
switch (tag) {
case HB_TAG ('c', 'v', 'a', 'r'): /* hint table, fallthrough */
case HB_TAG ('c', 'v', 't', ' '): /* hint table, fallthrough */
case HB_TAG ('f', 'p', 'g', 'm'): /* hint table, fallthrough */
case HB_TAG ('p', 'r', 'e', 'p'): /* hint table, fallthrough */
case HB_TAG ('h', 'd', 'm', 'x'): /* hint table, fallthrough */
case HB_TAG ('V', 'D', 'M', 'X'): /* hint table, fallthrough */
return plan->drop_hints;
#ifdef HB_NO_SUBSET_LAYOUT
// Drop Layout Tables if requested.
case HB_OT_TAG_GDEF:
case HB_OT_TAG_GPOS:
case HB_OT_TAG_GSUB:
case HB_TAG ('m', 'o', 'r', 'x'):
case HB_TAG ('m', 'o', 'r', 't'):
case HB_TAG ('k', 'e', 'r', 'x'):
case HB_TAG ('k', 'e', 'r', 'n'):
return true;
#endif
default:
return false;
}
}
static bool
_subset_table (hb_subset_plan_t *plan,
hb_tag_t tag)
@ -149,11 +196,15 @@ _subset_table (hb_subset_plan_t *plan,
case HB_OT_TAG_name:
result = _subset<const OT::name> (plan);
break;
case HB_OT_TAG_head:
// TODO that won't work well if there is no glyf
DEBUG_MSG(SUBSET, nullptr, "skip head, handled by glyf");
result = true;
case HB_OT_TAG_head: {
if (_is_table_present (plan->source, HB_OT_TAG_glyf) && !_should_drop_table (plan, HB_OT_TAG_glyf))
{
DEBUG_MSG(SUBSET, nullptr, "skip head, handled by glyf");
return true;
}
result = _subset<const OT::head> (plan);
break;
}
case HB_OT_TAG_hhea:
DEBUG_MSG(SUBSET, nullptr, "skip hhea handled by hmtx");
return true;
@ -234,38 +285,6 @@ _subset_table (hb_subset_plan_t *plan,
return result;
}
static bool
_should_drop_table (hb_subset_plan_t *plan, hb_tag_t tag)
{
if (plan->drop_tables->has (tag))
return true;
switch (tag) {
case HB_TAG ('c', 'v', 'a', 'r'): /* hint table, fallthrough */
case HB_TAG ('c', 'v', 't', ' '): /* hint table, fallthrough */
case HB_TAG ('f', 'p', 'g', 'm'): /* hint table, fallthrough */
case HB_TAG ('p', 'r', 'e', 'p'): /* hint table, fallthrough */
case HB_TAG ('h', 'd', 'm', 'x'): /* hint table, fallthrough */
case HB_TAG ('V', 'D', 'M', 'X'): /* hint table, fallthrough */
return plan->drop_hints;
#ifdef HB_NO_SUBSET_LAYOUT
// Drop Layout Tables if requested.
case HB_OT_TAG_GDEF:
case HB_OT_TAG_GPOS:
case HB_OT_TAG_GSUB:
case HB_TAG ('m', 'o', 'r', 'x'):
case HB_TAG ('m', 'o', 'r', 't'):
case HB_TAG ('k', 'e', 'r', 'x'):
case HB_TAG ('k', 'e', 'r', 'n'):
return true;
#endif
default:
return false;
}
}
/**
* hb_subset:
* @source: font face data to be subset.