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/*
* 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 "graph.hh"
#include "../OT/Layout/Common/Coverage.hh"
#ifndef GRAPH_COVERAGE_GRAPH_HH
#define GRAPH_COVERAGE_GRAPH_HH
namespace graph {
struct CoverageFormat1 : public OT::Layout::Common::CoverageFormat1_3<SmallTypes>
{
bool sanitize (graph_t::vertex_t& vertex) const
{
int64_t vertex_len = vertex.obj.tail - vertex.obj.head;
constexpr unsigned min_size = OT::Layout::Common::CoverageFormat1_3<SmallTypes>::min_size;
if (vertex_len < min_size) return false;
return vertex_len >= min_size + glyphArray.get_size () - glyphArray.len.get_size ();
}
};
struct CoverageFormat2 : public OT::Layout::Common::CoverageFormat2_4<SmallTypes>
{
bool sanitize (graph_t::vertex_t& vertex) const
{
int64_t vertex_len = vertex.obj.tail - vertex.obj.head;
constexpr unsigned min_size = OT::Layout::Common::CoverageFormat2_4<SmallTypes>::min_size;
if (vertex_len < min_size) return false;
return vertex_len >= min_size + rangeRecord.get_size () - rangeRecord.len.get_size ();
}
};
struct Coverage : public OT::Layout::Common::Coverage
{
static Coverage* clone_coverage (gsubgpos_graph_context_t& c,
unsigned coverage_id,
unsigned new_parent_id,
unsigned link_position,
unsigned start, unsigned end)
{
unsigned coverage_size = c.graph.vertices_[coverage_id].table_size ();
auto& coverage_v = c.graph.vertices_[coverage_id];
Coverage* coverage_table = (Coverage*) coverage_v.obj.head;
if (!coverage_table || !coverage_table->sanitize (coverage_v))
return nullptr;
auto new_coverage =
+ hb_zip (coverage_table->iter (), hb_range ())
| hb_filter ([&] (hb_pair_t<unsigned, unsigned> p) {
return p.second >= start && p.second < end;
})
| hb_map_retains_sorting (hb_first)
;
return add_coverage (c, new_parent_id, link_position, new_coverage, coverage_size);
}
template<typename It>
static Coverage* add_coverage (gsubgpos_graph_context_t& c,
unsigned parent_id,
unsigned link_position,
It glyphs,
unsigned max_size)
{
unsigned coverage_prime_id = c.graph.new_node (nullptr, nullptr);
auto& coverage_prime_vertex = c.graph.vertices_[coverage_prime_id];
if (!make_coverage (c, glyphs, coverage_prime_id, max_size))
return nullptr;
auto* coverage_link = c.graph.vertices_[parent_id].obj.real_links.push ();
coverage_link->width = SmallTypes::size;
coverage_link->objidx = coverage_prime_id;
coverage_link->position = link_position;
coverage_prime_vertex.parents.push (parent_id);
return (Coverage*) coverage_prime_vertex.obj.head;
}
template<typename It>
static bool make_coverage (gsubgpos_graph_context_t& c,
It glyphs,
unsigned dest_obj,
unsigned max_size)
{
char* buffer = (char*) hb_calloc (1, max_size);
hb_serialize_context_t serializer (buffer, max_size);
OT::Layout::Common::Coverage_serialize (&serializer, glyphs);
serializer.end_serialize ();
if (serializer.in_error ())
{
hb_free (buffer);
return false;
}
hb_bytes_t coverage_copy = serializer.copy_bytes ();
c.add_buffer ((char *) coverage_copy.arrayZ); // Give ownership to the context, it will cleanup the buffer.
auto& obj = c.graph.vertices_[dest_obj].obj;
obj.head = (char *) coverage_copy.arrayZ;
obj.tail = obj.head + coverage_copy.length;
hb_free (buffer);
return true;
}
bool sanitize (graph_t::vertex_t& vertex) const
{
int64_t vertex_len = vertex.obj.tail - vertex.obj.head;
if (vertex_len < OT::Layout::Common::Coverage::min_size) return false;
switch (u.format)
{
case 1: return ((CoverageFormat1*)this)->sanitize (vertex);
case 2: return ((CoverageFormat2*)this)->sanitize (vertex);
#ifndef HB_NO_BEYOND_64K
// Not currently supported
case 3:
case 4:
#endif
default: return false;
}
}
};
}
#endif // GRAPH_COVERAGE_GRAPH_HH
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