Garret Rieger
2 years ago
parent
ca0df565f7
commit
68b90153ea
5 changed files with 156 additions and 3 deletions
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/*
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* Copyright © 2022 Google, Inc. |
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* |
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* This is part of HarfBuzz, a text shaping library. |
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* |
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* Permission is hereby granted, without written agreement and without |
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* license or royalty fees, to use, copy, modify, and distribute this |
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* software and its documentation for any purpose, provided that the |
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* above copyright notice and the following two paragraphs appear in |
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* all copies of this software. |
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* |
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR |
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES |
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN |
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH |
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* DAMAGE. |
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* |
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, |
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND |
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS |
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO |
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. |
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* |
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* Google Author(s): Garret Rieger |
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*/ |
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#include "graph.hh" |
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#include "../hb-ot-layout-common.hh" |
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#ifndef GRAPH_CLASSDEF_GRAPH_HH |
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#define GRAPH_CLASSDEF_GRAPH_HH |
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namespace graph { |
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struct ClassDefFormat1 : public OT::ClassDefFormat1_3<SmallTypes> |
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{ |
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bool sanitize (graph_t::vertex_t& vertex) const |
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{ |
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int64_t vertex_len = vertex.obj.tail - vertex.obj.head; |
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constexpr unsigned min_size = OT::ClassDefFormat1_3<SmallTypes>::min_size; |
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if (vertex_len < min_size) return false; |
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return vertex_len >= min_size + classValue.get_size () - classValue.len.get_size (); |
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} |
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}; |
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struct ClassDefFormat2 : public OT::ClassDefFormat2_4<SmallTypes> |
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{ |
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bool sanitize (graph_t::vertex_t& vertex) const |
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{ |
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int64_t vertex_len = vertex.obj.tail - vertex.obj.head; |
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constexpr unsigned min_size = OT::ClassDefFormat2_4<SmallTypes>::min_size; |
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if (vertex_len < min_size) return false; |
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return vertex_len >= min_size + rangeRecord.get_size () - rangeRecord.len.get_size (); |
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} |
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}; |
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struct ClassDef : public OT::ClassDef |
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{ |
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template<typename It> |
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static bool clone_class_def (gsubgpos_graph_context_t& c, |
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unsigned class_def_id, |
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unsigned new_parent_id, |
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unsigned link_position, |
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It glyphs) |
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{ |
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unsigned class_def_size = c.graph.vertices_[class_def_id].table_size (); |
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auto& class_def_v = c.graph.vertices_[class_def_id]; |
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ClassDef* class_def_table = (ClassDef*) class_def_v.obj.head; |
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if (!class_def_table->sanitize (class_def_v)) |
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return false; |
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auto new_class_def = |
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+ glyphs |
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| hb_map_retains_sorting ([&] (hb_codepoint_t gid) { |
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return hb_pair (gid, class_def_table[gid]); |
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}) |
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; |
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unsigned class_def_prime_id = c.graph.new_node (nullptr, nullptr); |
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auto& class_def_prime_vertex = c.graph.vertices_[class_def_prime_id]; |
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if (!make_class_def (c, new_class_def, class_def_prime_id, class_def_size)) |
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return false; |
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auto* class_def_link = c.graph.vertices_[new_parent_id].obj.real_links.push (); |
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class_def_link->width = SmallTypes::size; |
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class_def_link->objidx = class_def_prime_id; |
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class_def_link->position = link_position; |
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class_def_prime_vertex.parents.push (new_parent_id); |
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return true; |
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} |
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template<typename It> |
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static bool make_class_def (gsubgpos_graph_context_t& c, |
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It glyph_and_class, |
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unsigned dest_obj, |
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unsigned max_size) |
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{ |
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char* buffer = (char*) hb_calloc (1, max_size); |
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hb_serialize_context_t serializer (buffer, max_size); |
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ClassDef_serialize (&serializer, glyph_and_class); |
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serializer.end_serialize (); |
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if (serializer.in_error ()) |
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{ |
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hb_free (buffer); |
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return false; |
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} |
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hb_bytes_t class_def_copy = serializer.copy_bytes (); |
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c.add_buffer ((char *) class_def_copy.arrayZ); // Give ownership to the context, it will cleanup the buffer.
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auto& obj = c.graph.vertices_[dest_obj].obj; |
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obj.head = (char *) class_def_copy.arrayZ; |
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obj.tail = obj.head + class_def_copy.length; |
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hb_free (buffer); |
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return true; |
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} |
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bool sanitize (graph_t::vertex_t& vertex) const |
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{ |
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int64_t vertex_len = vertex.obj.tail - vertex.obj.head; |
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if (vertex_len < OT::ClassDef::min_size) return false; |
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switch (u.format) |
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{ |
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case 1: return ((ClassDefFormat1*)this)->sanitize (vertex); |
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case 2: return ((ClassDefFormat2*)this)->sanitize (vertex); |
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#ifndef HB_NO_BORING_EXPANSION |
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// Not currently supported
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case 3: |
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case 4: |
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#endif |
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default: return false; |
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} |
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} |
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}; |
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} |
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#endif // GRAPH_CLASSDEF_GRAPH_HH
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