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[repacker] add make_extension_context_t.

This commit is contained in:
Garret Rieger 2022-07-21 19:07:55 +00:00
parent ebb64b50da
commit ce03c3538a
5 changed files with 103 additions and 57 deletions
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4
src/graph/graph.hh
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@ -24,6 +24,10 @@
* Google Author(s): Garret Rieger
*/
#include "hb-set.hh"
#include "hb-priority-queue.hh"
#include "hb-serialize.hh"
#ifndef GRAPH_GRAPH_HH
#define GRAPH_GRAPH_HH

41
src/graph/gsubgpos-graph.cc Normal file
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@ -0,0 +1,41 @@
/*
* Copyright © 2022 Google, Inc.
*
* This is part of HarfBuzz, a text shaping library.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and its documentation for any purpose, provided that the
* above copyright notice and the following two paragraphs appear in
* all copies of this software.
*
* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
* Google Author(s): Garret Rieger
*/
#include "gsubgpos-graph.hh"
namespace graph {
unsigned make_extension_context_t::num_non_ext_subtables () {
unsigned count = 0;
for (auto l : lookups.values ())
{
if (l->is_extension (table_tag)) continue;
count += l->number_of_subtables ();
}
return count;
}
}

74
src/graph/gsubgpos-graph.hh
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@ -24,13 +24,13 @@
* Google Author(s): Garret Rieger
*/
#ifndef GRAPH_GSUBGPOS_GRAPH_HH
#define GRAPH_GSUBGPOS_GRAPH_HH
#include "graph.hh"
#include "hb-ot-layout-gsubgpos.hh"
#include "OT/Layout/GSUB/ExtensionSubst.hh"
#ifndef GRAPH_GSUBGPOS_GRAPH_HH
#define GRAPH_GSUBGPOS_GRAPH_HH
namespace graph {
struct Lookup;
@ -69,10 +69,37 @@ struct GSTAR : public OT::GSUBGPOS
Lookup* lookup = (Lookup*) graph.object (lookup_idx).head;
lookups.set (lookup_idx, lookup);
}
}
}
};
struct make_extension_context_t
{
hb_tag_t table_tag;
graph_t& graph;
hb_vector_t<char> buffer;
GSTAR* gstar;
hb_hashmap_t<unsigned, graph::Lookup*> lookups;
make_extension_context_t (hb_tag_t table_tag_,
graph_t& graph_)
: table_tag (table_tag_),
graph (graph_),
buffer (),
gstar (graph::GSTAR::graph_to_gstar (graph_)),
lookups ()
{
gstar->find_lookups (graph, lookups);
unsigned extension_size = OT::ExtensionFormat1<OT::Layout::GSUB_impl::ExtensionSubst>::static_size;
buffer.alloc (num_non_ext_subtables () * extension_size);
}
bool in_error () const
{
return buffer.in_error ();
}
private:
unsigned num_non_ext_subtables ();
};
struct Lookup : public OT::Lookup
@ -87,15 +114,13 @@ struct Lookup : public OT::Lookup
return lookupType == extension_type (table_tag);
}
bool make_extension (hb_tag_t table_tag,
graph_t& graph,
unsigned this_index,
hb_vector_t<char>& buffer)
bool make_extension (make_extension_context_t& c,
unsigned this_index)
{
// TODO: use a context_t?
unsigned type = lookupType;
unsigned ext_type = extension_type (table_tag);
if (!ext_type || is_extension (table_tag))
unsigned ext_type = extension_type (c.table_tag);
if (!ext_type || is_extension (c.table_tag))
{
// NOOP
printf("Already extension (obj %u).\n", this_index);
@ -109,11 +134,10 @@ struct Lookup : public OT::Lookup
for (unsigned i = 0; i < subTable.len; i++)
{
unsigned subtable_index = graph.index_for_offset (this_index, &subTable[i]);
if (!make_subtable_extension (graph,
unsigned subtable_index = c.graph.index_for_offset (this_index, &subTable[i]);
if (!make_subtable_extension (c,
this_index,
subtable_index,
buffer))
subtable_index))
return false;
}
@ -121,23 +145,22 @@ struct Lookup : public OT::Lookup
return true;
}
bool make_subtable_extension (graph_t& graph,
bool make_subtable_extension (make_extension_context_t& c,
unsigned lookup_index,
unsigned subtable_index,
hb_vector_t<char>& buffer)
unsigned subtable_index)
{
printf(" Promoting subtable %u in lookup %u to extension.\n", subtable_index, lookup_index);
unsigned type = lookupType;
unsigned extension_size = OT::ExtensionFormat1<OT::Layout::GSUB_impl::ExtensionSubst>::static_size;
unsigned start = buffer.length;
unsigned start = c.buffer.length;
unsigned end = start + extension_size;
if (!buffer.resize (buffer.length + extension_size))
if (!c.buffer.resize (c.buffer.length + extension_size))
// TODO: resizing potentially invalidates existing head/tail pointers.
return false;
OT::ExtensionFormat1<OT::Layout::GSUB_impl::ExtensionSubst>* extension =
(OT::ExtensionFormat1<OT::Layout::GSUB_impl::ExtensionSubst>*) &buffer[start];
(OT::ExtensionFormat1<OT::Layout::GSUB_impl::ExtensionSubst>*) &c.buffer[start];
extension->format = 1;
extension->extensionLookupType = type;
extension->extensionOffset = 0;
@ -145,11 +168,11 @@ struct Lookup : public OT::Lookup
unsigned type_prime = extension->extensionLookupType;
printf("Assigned type %d to extension\n", type_prime);
unsigned ext_index = graph.new_node (&buffer.arrayZ[start],
&buffer.arrayZ[end]);
unsigned ext_index = c.graph.new_node (&c.buffer.arrayZ[start],
&c.buffer.arrayZ[end]);
if (ext_index == (unsigned) -1) return false;
auto& lookup_vertex = graph.vertices_[lookup_index];
auto& lookup_vertex = c.graph.vertices_[lookup_index];
for (auto& l : lookup_vertex.obj.real_links.writer ())
{
if (l.objidx == subtable_index)
@ -161,9 +184,8 @@ struct Lookup : public OT::Lookup
}
// Make extension point at the subtable.
// TODO: update extension parents array.
auto& ext_vertex = graph.vertices_[ext_index];
auto& subtable_vertex = graph.vertices_[subtable_index];
auto& ext_vertex = c.graph.vertices_[ext_index];
auto& subtable_vertex = c.graph.vertices_[subtable_index];
auto* l = ext_vertex.obj.real_links.push ();
l->width = 4;

38
src/hb-repacker.hh
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@ -29,8 +29,6 @@
#include "hb-open-type.hh"
#include "hb-map.hh"
#include "hb-priority-queue.hh"
#include "hb-serialize.hh"
#include "hb-vector.hh"
#include "graph/graph.hh"
#include "graph/gsubgpos-graph.hh"
@ -44,35 +42,12 @@ using graph::graph_t;
*/
static inline
unsigned _num_non_ext_subtables (hb_tag_t table_tag,
const hb_hashmap_t<unsigned, graph::Lookup*>& lookups)
{
unsigned count = 0;
for (auto l : lookups.values ())
{
if (l->is_extension (table_tag)) continue;
count += l->number_of_subtables ();
}
return count;
}
static inline
bool _make_extensions (hb_tag_t table_tag, graph_t& sorted_graph, hb_vector_t<char>& buffer)
bool _make_extensions (graph::make_extension_context_t& ext_context)
{
// TODO: Move this into graph or gsubgpos graph?
graph::GSTAR* gstar = graph::GSTAR::graph_to_gstar (sorted_graph);
hb_hashmap_t<unsigned, graph::Lookup*> lookups;
gstar->find_lookups (sorted_graph, lookups);
unsigned extension_size = OT::ExtensionFormat1<OT::Layout::GSUB_impl::ExtensionSubst>::static_size;
if (!buffer.alloc (_num_non_ext_subtables (table_tag, lookups) * extension_size))
return false;
for (auto p : lookups.iter ())
for (auto p : ext_context.lookups.iter ())
{
if (!p.second->make_extension (table_tag, sorted_graph, p.first, buffer))
if (!p.second->make_extension (ext_context, p.first))
return false;
}
return true;
@ -206,12 +181,15 @@ hb_resolve_overflows (const T& packed,
return graph::serialize (sorted_graph);
}
hb_vector_t<char> extension_buffer;
graph::make_extension_context_t ext_context (table_tag, sorted_graph);
if (ext_context.in_error ())
return nullptr;
if ((table_tag == HB_OT_TAG_GPOS
|| table_tag == HB_OT_TAG_GSUB)
&& will_overflow)
{
if (!_make_extensions (table_tag, sorted_graph, extension_buffer)) {
if (!_make_extensions (ext_context)) {
printf("make extensions failed.\n");
return nullptr;
}

3
src/meson.build
View File

@ -345,6 +345,7 @@ hb_subset_sources = files(
'hb-subset-plan.cc',
'hb-subset-plan.hh',
'hb-subset-repacker.cc',
'graph/gsubgpos-graph.cc',
'hb-subset.cc',
'hb-subset.hh',
)
@ -573,7 +574,7 @@ if get_option('tests').enabled()
'test-number': ['test-number.cc', 'hb-number.cc'],
'test-ot-tag': ['hb-ot-tag.cc'],
'test-priority-queue': ['test-priority-queue.cc', 'hb-static.cc'],
'test-repacker': ['test-repacker.cc', 'hb-static.cc'],
'test-repacker': ['test-repacker.cc', 'hb-static.cc', 'graph/gsubgpos-graph.cc'],
'test-set': ['test-set.cc', 'hb-static.cc'],
'test-serialize': ['test-serialize.cc', 'hb-static.cc'],
'test-unicode-ranges': ['test-unicode-ranges.cc'],