diff options
Diffstat (limited to 'gfx/harfbuzz/src/graph')
| -rw-r--r-- | gfx/harfbuzz/src/graph/classdef-graph.hh | 225 | ||||
| -rw-r--r-- | gfx/harfbuzz/src/graph/coverage-graph.hh | 161 | ||||
| -rw-r--r-- | gfx/harfbuzz/src/graph/graph.hh | 1519 | ||||
| -rw-r--r-- | gfx/harfbuzz/src/graph/gsubgpos-context.cc | 74 | ||||
| -rw-r--r-- | gfx/harfbuzz/src/graph/gsubgpos-context.hh | 61 | ||||
| -rw-r--r-- | gfx/harfbuzz/src/graph/gsubgpos-graph.hh | 435 | ||||
| -rw-r--r-- | gfx/harfbuzz/src/graph/markbasepos-graph.hh | 518 | ||||
| -rw-r--r-- | gfx/harfbuzz/src/graph/pairpos-graph.hh | 650 | ||||
| -rw-r--r-- | gfx/harfbuzz/src/graph/serialize.hh | 273 | ||||
| -rw-r--r-- | gfx/harfbuzz/src/graph/split-helpers.hh | 69 | ||||
| -rw-r--r-- | gfx/harfbuzz/src/graph/test-classdef-graph.cc | 119 |
11 files changed, 4104 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/graph/classdef-graph.hh b/gfx/harfbuzz/src/graph/classdef-graph.hh new file mode 100644 index 0000000000..9cf845a82d --- /dev/null +++ b/gfx/harfbuzz/src/graph/classdef-graph.hh @@ -0,0 +1,225 @@ +/* + * 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 "../hb-ot-layout-common.hh" + +#ifndef GRAPH_CLASSDEF_GRAPH_HH +#define GRAPH_CLASSDEF_GRAPH_HH + +namespace graph { + +struct ClassDefFormat1 : public OT::ClassDefFormat1_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::ClassDefFormat1_3<SmallTypes>::min_size; + if (vertex_len < min_size) return false; + hb_barrier (); + return vertex_len >= min_size + classValue.get_size () - classValue.len.get_size (); + } +}; + +struct ClassDefFormat2 : public OT::ClassDefFormat2_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::ClassDefFormat2_4<SmallTypes>::min_size; + if (vertex_len < min_size) return false; + hb_barrier (); + return vertex_len >= min_size + rangeRecord.get_size () - rangeRecord.len.get_size (); + } +}; + +struct ClassDef : public OT::ClassDef +{ + template<typename It> + static bool add_class_def (gsubgpos_graph_context_t& c, + unsigned parent_id, + unsigned link_position, + It glyph_and_class, + unsigned max_size) + { + unsigned class_def_prime_id = c.graph.new_node (nullptr, nullptr); + auto& class_def_prime_vertex = c.graph.vertices_[class_def_prime_id]; + if (!make_class_def (c, glyph_and_class, class_def_prime_id, max_size)) + return false; + + auto* class_def_link = c.graph.vertices_[parent_id].obj.real_links.push (); + class_def_link->width = SmallTypes::size; + class_def_link->objidx = class_def_prime_id; + class_def_link->position = link_position; + class_def_prime_vertex.add_parent (parent_id); + + return true; + } + + template<typename It> + static bool make_class_def (gsubgpos_graph_context_t& c, + It glyph_and_class, + unsigned dest_obj, + unsigned max_size) + { + char* buffer = (char*) hb_calloc (1, max_size); + hb_serialize_context_t serializer (buffer, max_size); + OT::ClassDef_serialize (&serializer, glyph_and_class); + serializer.end_serialize (); + if (serializer.in_error ()) + { + hb_free (buffer); + return false; + } + + hb_bytes_t class_def_copy = serializer.copy_bytes (); + if (!class_def_copy.arrayZ) return false; + // Give ownership to the context, it will cleanup the buffer. + if (!c.add_buffer ((char *) class_def_copy.arrayZ)) + { + hb_free ((char *) class_def_copy.arrayZ); + return false; + } + + auto& obj = c.graph.vertices_[dest_obj].obj; + obj.head = (char *) class_def_copy.arrayZ; + obj.tail = obj.head + class_def_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::ClassDef::min_size) return false; + hb_barrier (); + switch (u.format) + { + case 1: return ((ClassDefFormat1*)this)->sanitize (vertex); + case 2: return ((ClassDefFormat2*)this)->sanitize (vertex); +#ifndef HB_NO_BEYOND_64K + // Not currently supported + case 3: + case 4: +#endif + default: return false; + } + } +}; + + +struct class_def_size_estimator_t +{ + template<typename It> + class_def_size_estimator_t (It glyph_and_class) + : gids_consecutive (true), num_ranges_per_class (), glyphs_per_class () + { + unsigned last_gid = (unsigned) -1; + for (auto p : + glyph_and_class) + { + unsigned gid = p.first; + unsigned klass = p.second; + + if (last_gid != (unsigned) -1 && gid != last_gid + 1) + gids_consecutive = false; + last_gid = gid; + + hb_set_t* glyphs; + if (glyphs_per_class.has (klass, &glyphs) && glyphs) { + glyphs->add (gid); + continue; + } + + hb_set_t new_glyphs; + new_glyphs.add (gid); + glyphs_per_class.set (klass, std::move (new_glyphs)); + } + + if (in_error ()) return; + + for (unsigned klass : glyphs_per_class.keys ()) + { + if (!klass) continue; // class 0 doesn't get encoded. + + const hb_set_t& glyphs = glyphs_per_class.get (klass); + hb_codepoint_t start = HB_SET_VALUE_INVALID; + hb_codepoint_t end = HB_SET_VALUE_INVALID; + + unsigned count = 0; + while (glyphs.next_range (&start, &end)) + count++; + + num_ranges_per_class.set (klass, count); + } + } + + // Incremental increase in the Coverage and ClassDef table size + // (worst case) if all glyphs associated with 'klass' were added. + unsigned incremental_coverage_size (unsigned klass) const + { + // Coverage takes 2 bytes per glyph worst case, + return 2 * glyphs_per_class.get (klass).get_population (); + } + + // Incremental increase in the Coverage and ClassDef table size + // (worst case) if all glyphs associated with 'klass' were added. + unsigned incremental_class_def_size (unsigned klass) const + { + // ClassDef takes 6 bytes per range + unsigned class_def_2_size = 6 * num_ranges_per_class.get (klass); + if (gids_consecutive) + { + // ClassDef1 takes 2 bytes per glyph, but only can be used + // when gids are consecutive. + return hb_min (2 * glyphs_per_class.get (klass).get_population (), class_def_2_size); + } + + return class_def_2_size; + } + + bool in_error () + { + if (num_ranges_per_class.in_error ()) return true; + if (glyphs_per_class.in_error ()) return true; + + for (const hb_set_t& s : glyphs_per_class.values ()) + { + if (s.in_error ()) return true; + } + return false; + } + + private: + bool gids_consecutive; + hb_hashmap_t<unsigned, unsigned> num_ranges_per_class; + hb_hashmap_t<unsigned, hb_set_t> glyphs_per_class; +}; + + +} + +#endif // GRAPH_CLASSDEF_GRAPH_HH diff --git a/gfx/harfbuzz/src/graph/coverage-graph.hh b/gfx/harfbuzz/src/graph/coverage-graph.hh new file mode 100644 index 0000000000..61ca063e34 --- /dev/null +++ b/gfx/harfbuzz/src/graph/coverage-graph.hh @@ -0,0 +1,161 @@ +/* + * 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; + hb_barrier (); + 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; + hb_barrier (); + 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.add_parent (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 (); + if (!coverage_copy.arrayZ) return false; + // Give ownership to the context, it will cleanup the buffer. + if (!c.add_buffer ((char *) coverage_copy.arrayZ)) + { + hb_free ((char *) coverage_copy.arrayZ); + return false; + } + + 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; + hb_barrier (); + 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 diff --git a/gfx/harfbuzz/src/graph/graph.hh b/gfx/harfbuzz/src/graph/graph.hh new file mode 100644 index 0000000000..26ad00bdd9 --- /dev/null +++ b/gfx/harfbuzz/src/graph/graph.hh @@ -0,0 +1,1519 @@ +/* + * 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 "../hb-set.hh" +#include "../hb-priority-queue.hh" +#include "../hb-serialize.hh" + +#ifndef GRAPH_GRAPH_HH +#define GRAPH_GRAPH_HH + +namespace graph { + +/** + * Represents a serialized table in the form of a graph. + * Provides methods for modifying and reordering the graph. + */ +struct graph_t +{ + struct vertex_t + { + hb_serialize_context_t::object_t obj; + int64_t distance = 0 ; + unsigned space = 0 ; + unsigned start = 0; + unsigned end = 0; + unsigned priority = 0; + private: + unsigned incoming_edges_ = 0; + unsigned single_parent = (unsigned) -1; + hb_hashmap_t<unsigned, unsigned> parents; + public: + + auto parents_iter () const HB_AUTO_RETURN + ( + hb_concat ( + hb_iter (&single_parent, single_parent != (unsigned) -1), + parents.keys_ref () + ) + ) + + bool in_error () const + { + return parents.in_error (); + } + + bool link_positions_valid (unsigned num_objects, bool removed_nil) + { + hb_set_t assigned_bytes; + for (const auto& l : obj.real_links) + { + if (l.objidx >= num_objects + || (removed_nil && !l.objidx)) + { + DEBUG_MSG (SUBSET_REPACK, nullptr, + "Invalid graph. Invalid object index."); + return false; + } + + unsigned start = l.position; + unsigned end = start + l.width - 1; + + if (unlikely (l.width < 2 || l.width > 4)) + { + DEBUG_MSG (SUBSET_REPACK, nullptr, + "Invalid graph. Invalid link width."); + return false; + } + + if (unlikely (end >= table_size ())) + { + DEBUG_MSG (SUBSET_REPACK, nullptr, + "Invalid graph. Link position is out of bounds."); + return false; + } + + if (unlikely (assigned_bytes.intersects (start, end))) + { + DEBUG_MSG (SUBSET_REPACK, nullptr, + "Invalid graph. Found offsets whose positions overlap."); + return false; + } + + assigned_bytes.add_range (start, end); + } + + return !assigned_bytes.in_error (); + } + + void normalize () + { + obj.real_links.qsort (); + for (auto& l : obj.real_links) + { + for (unsigned i = 0; i < l.width; i++) + { + obj.head[l.position + i] = 0; + } + } + } + + bool equals (const vertex_t& other, + const graph_t& graph, + const graph_t& other_graph, + unsigned depth) const + { + if (!(as_bytes () == other.as_bytes ())) + { + DEBUG_MSG (SUBSET_REPACK, nullptr, + "vertex [%lu] bytes != [%lu] bytes, depth = %u", + (unsigned long) table_size (), + (unsigned long) other.table_size (), + depth); + + auto a = as_bytes (); + auto b = other.as_bytes (); + while (a || b) + { + DEBUG_MSG (SUBSET_REPACK, nullptr, + " 0x%x %s 0x%x", (unsigned) *a, (*a == *b) ? "==" : "!=", (unsigned) *b); + a++; + b++; + } + return false; + } + + return links_equal (obj.real_links, other.obj.real_links, graph, other_graph, depth); + } + + hb_bytes_t as_bytes () const + { + return hb_bytes_t (obj.head, table_size ()); + } + + friend void swap (vertex_t& a, vertex_t& b) + { + hb_swap (a.obj, b.obj); + hb_swap (a.distance, b.distance); + hb_swap (a.space, b.space); + hb_swap (a.single_parent, b.single_parent); + hb_swap (a.parents, b.parents); + hb_swap (a.incoming_edges_, b.incoming_edges_); + hb_swap (a.start, b.start); + hb_swap (a.end, b.end); + hb_swap (a.priority, b.priority); + } + + hb_hashmap_t<unsigned, unsigned> + position_to_index_map () const + { + hb_hashmap_t<unsigned, unsigned> result; + + result.alloc (obj.real_links.length); + for (const auto& l : obj.real_links) { + result.set (l.position, l.objidx); + } + + return result; + } + + bool is_shared () const + { + return parents.get_population () > 1; + } + + unsigned incoming_edges () const + { + if (HB_DEBUG_SUBSET_REPACK) + { + assert (incoming_edges_ == (single_parent != (unsigned) -1) + + (parents.values_ref () | hb_reduce (hb_add, 0))); + } + return incoming_edges_; + } + + void reset_parents () + { + incoming_edges_ = 0; + single_parent = (unsigned) -1; + parents.reset (); + } + + void add_parent (unsigned parent_index) + { + assert (parent_index != (unsigned) -1); + if (incoming_edges_ == 0) + { + single_parent = parent_index; + incoming_edges_ = 1; + return; + } + else if (single_parent != (unsigned) -1) + { + assert (incoming_edges_ == 1); + if (!parents.set (single_parent, 1)) + return; + single_parent = (unsigned) -1; + } + + unsigned *v; + if (parents.has (parent_index, &v)) + { + (*v)++; + incoming_edges_++; + } + else if (parents.set (parent_index, 1)) + incoming_edges_++; + } + + void remove_parent (unsigned parent_index) + { + if (parent_index == single_parent) + { + single_parent = (unsigned) -1; + incoming_edges_--; + return; + } + + unsigned *v; + if (parents.has (parent_index, &v)) + { + incoming_edges_--; + if (*v > 1) + (*v)--; + else + parents.del (parent_index); + + if (incoming_edges_ == 1) + { + single_parent = *parents.keys (); + parents.reset (); + } + } + } + + void remove_real_link (unsigned child_index, const void* offset) + { + unsigned count = obj.real_links.length; + for (unsigned i = 0; i < count; i++) + { + auto& link = obj.real_links.arrayZ[i]; + if (link.objidx != child_index) + continue; + + if ((obj.head + link.position) != offset) + continue; + + obj.real_links.remove_unordered (i); + return; + } + } + + bool remap_parents (const hb_vector_t<unsigned>& id_map) + { + if (single_parent != (unsigned) -1) + { + assert (single_parent < id_map.length); + single_parent = id_map[single_parent]; + return true; + } + + hb_hashmap_t<unsigned, unsigned> new_parents; + new_parents.alloc (parents.get_population ()); + for (auto _ : parents) + { + assert (_.first < id_map.length); + assert (!new_parents.has (id_map[_.first])); + new_parents.set (id_map[_.first], _.second); + } + + if (parents.in_error() || new_parents.in_error ()) + return false; + + parents = std::move (new_parents); + return true; + } + + void remap_parent (unsigned old_index, unsigned new_index) + { + if (single_parent != (unsigned) -1) + { + if (single_parent == old_index) + single_parent = new_index; + return; + } + + const unsigned *pv; + if (parents.has (old_index, &pv)) + { + unsigned v = *pv; + if (!parents.set (new_index, v)) + incoming_edges_ -= v; + parents.del (old_index); + + if (incoming_edges_ == 1) + { + single_parent = *parents.keys (); + parents.reset (); + } + } + } + + bool is_leaf () const + { + return !obj.real_links.length && !obj.virtual_links.length; + } + + bool raise_priority () + { + if (has_max_priority ()) return false; + priority++; + return true; + } + + bool has_max_priority () const { + return priority >= 3; + } + + size_t table_size () const { + return obj.tail - obj.head; + } + + int64_t modified_distance (unsigned order) const + { + // TODO(garretrieger): once priority is high enough, should try + // setting distance = 0 which will force to sort immediately after + // it's parent where possible. + + int64_t modified_distance = + hb_min (hb_max(distance + distance_modifier (), 0), 0x7FFFFFFFFFF); + if (has_max_priority ()) { + modified_distance = 0; + } + return (modified_distance << 18) | (0x003FFFF & order); + } + + int64_t distance_modifier () const + { + if (!priority) return 0; + int64_t table_size = obj.tail - obj.head; + + if (priority == 1) + return -table_size / 2; + + return -table_size; + } + + private: + bool links_equal (const hb_vector_t<hb_serialize_context_t::object_t::link_t>& this_links, + const hb_vector_t<hb_serialize_context_t::object_t::link_t>& other_links, + const graph_t& graph, + const graph_t& other_graph, + unsigned depth) const + { + auto a = this_links.iter (); + auto b = other_links.iter (); + + while (a && b) + { + const auto& link_a = *a; + const auto& link_b = *b; + + if (link_a.width != link_b.width || + link_a.is_signed != link_b.is_signed || + link_a.whence != link_b.whence || + link_a.position != link_b.position || + link_a.bias != link_b.bias) + return false; + + if (!graph.vertices_[link_a.objidx].equals ( + other_graph.vertices_[link_b.objidx], graph, other_graph, depth + 1)) + return false; + + a++; + b++; + } + + if (bool (a) != bool (b)) + return false; + + return true; + } + }; + + template <typename T> + struct vertex_and_table_t + { + vertex_and_table_t () : index (0), vertex (nullptr), table (nullptr) + {} + + unsigned index; + vertex_t* vertex; + T* table; + + operator bool () { + return table && vertex; + } + }; + + /* + * A topological sorting of an object graph. Ordered + * in reverse serialization order (first object in the + * serialization is at the end of the list). This matches + * the 'packed' object stack used internally in the + * serializer + */ + template<typename T> + graph_t (const T& objects) + : parents_invalid (true), + distance_invalid (true), + positions_invalid (true), + successful (true), + buffers () + { + num_roots_for_space_.push (1); + bool removed_nil = false; + vertices_.alloc (objects.length); + vertices_scratch_.alloc (objects.length); + unsigned count = objects.length; + for (unsigned i = 0; i < count; i++) + { + // If this graph came from a serialization buffer object 0 is the + // nil object. We don't need it for our purposes here so drop it. + if (i == 0 && !objects.arrayZ[i]) + { + removed_nil = true; + continue; + } + + vertex_t* v = vertices_.push (); + if (check_success (!vertices_.in_error ())) + v->obj = *objects.arrayZ[i]; + + check_success (v->link_positions_valid (count, removed_nil)); + + if (!removed_nil) continue; + // Fix indices to account for removed nil object. + for (auto& l : v->obj.all_links_writer ()) { + l.objidx--; + } + } + } + + ~graph_t () + { + for (char* b : buffers) + hb_free (b); + } + + bool operator== (const graph_t& other) const + { + return root ().equals (other.root (), *this, other, 0); + } + + void print () const { + for (int i = vertices_.length - 1; i >= 0; i--) + { + const auto& v = vertices_[i]; + printf("%d: %u [", i, (unsigned int)v.table_size()); + for (const auto &l : v.obj.real_links) { + printf("%u, ", l.objidx); + } + printf("]\n"); + } + } + + // Sorts links of all objects in a consistent manner and zeroes all offsets. + void normalize () + { + for (auto& v : vertices_.writer ()) + v.normalize (); + } + + bool in_error () const + { + return !successful || + vertices_.in_error () || + num_roots_for_space_.in_error (); + } + + const vertex_t& root () const + { + return vertices_[root_idx ()]; + } + + unsigned root_idx () const + { + // Object graphs are in reverse order, the first object is at the end + // of the vector. Since the graph is topologically sorted it's safe to + // assume the first object has no incoming edges. + return vertices_.length - 1; + } + + const hb_serialize_context_t::object_t& object (unsigned i) const + { + return vertices_[i].obj; + } + + bool add_buffer (char* buffer) + { + buffers.push (buffer); + return !buffers.in_error (); + } + + /* + * Adds a 16 bit link from parent_id to child_id + */ + template<typename T> + void add_link (T* offset, + unsigned parent_id, + unsigned child_id) + { + auto& v = vertices_[parent_id]; + auto* link = v.obj.real_links.push (); + link->width = 2; + link->objidx = child_id; + link->position = (char*) offset - (char*) v.obj.head; + vertices_[child_id].add_parent (parent_id); + } + + /* + * Generates a new topological sorting of graph ordered by the shortest + * distance to each node if positions are marked as invalid. + */ + void sort_shortest_distance_if_needed () + { + if (!positions_invalid) return; + sort_shortest_distance (); + } + + + /* + * Generates a new topological sorting of graph ordered by the shortest + * distance to each node. + */ + void sort_shortest_distance () + { + positions_invalid = true; + + if (vertices_.length <= 1) { + // Graph of 1 or less doesn't need sorting. + return; + } + + update_distances (); + + hb_priority_queue_t<int64_t> queue; + queue.alloc (vertices_.length); + hb_vector_t<vertex_t> &sorted_graph = vertices_scratch_; + if (unlikely (!check_success (sorted_graph.resize (vertices_.length)))) return; + hb_vector_t<unsigned> id_map; + if (unlikely (!check_success (id_map.resize (vertices_.length)))) return; + + hb_vector_t<unsigned> removed_edges; + if (unlikely (!check_success (removed_edges.resize (vertices_.length)))) return; + update_parents (); + + queue.insert (root ().modified_distance (0), root_idx ()); + int new_id = root_idx (); + unsigned order = 1; + while (!queue.in_error () && !queue.is_empty ()) + { + unsigned next_id = queue.pop_minimum().second; + + sorted_graph[new_id] = std::move (vertices_[next_id]); + const vertex_t& next = sorted_graph[new_id]; + + if (unlikely (!check_success(new_id >= 0))) { + // We are out of ids. Which means we've visited a node more than once. + // This graph contains a cycle which is not allowed. + DEBUG_MSG (SUBSET_REPACK, nullptr, "Invalid graph. Contains cycle."); + return; + } + + id_map[next_id] = new_id--; + + for (const auto& link : next.obj.all_links ()) { + removed_edges[link.objidx]++; + if (!(vertices_[link.objidx].incoming_edges () - removed_edges[link.objidx])) + // Add the order that the links were encountered to the priority. + // This ensures that ties between priorities objects are broken in a consistent + // way. More specifically this is set up so that if a set of objects have the same + // distance they'll be added to the topological order in the order that they are + // referenced from the parent object. + queue.insert (vertices_[link.objidx].modified_distance (order++), + link.objidx); + } + } + + check_success (!queue.in_error ()); + check_success (!sorted_graph.in_error ()); + + check_success (remap_all_obj_indices (id_map, &sorted_graph)); + vertices_ = std::move (sorted_graph); + + if (!check_success (new_id == -1)) + print_orphaned_nodes (); + } + + /* + * Finds the set of nodes (placed into roots) that should be assigned unique spaces. + * More specifically this looks for the top most 24 bit or 32 bit links in the graph. + * Some special casing is done that is specific to the layout of GSUB/GPOS tables. + */ + void find_space_roots (hb_set_t& visited, hb_set_t& roots) + { + int root_index = (int) root_idx (); + for (int i = root_index; i >= 0; i--) + { + if (visited.has (i)) continue; + + // Only real links can form 32 bit spaces + for (auto& l : vertices_[i].obj.real_links) + { + if (l.is_signed || l.width < 3) + continue; + + if (i == root_index && l.width == 3) + // Ignore 24bit links from the root node, this skips past the single 24bit + // pointer to the lookup list. + continue; + + if (l.width == 3) + { + // A 24bit offset forms a root, unless there is 32bit offsets somewhere + // in it's subgraph, then those become the roots instead. This is to make sure + // that extension subtables beneath a 24bit lookup become the spaces instead + // of the offset to the lookup. + hb_set_t sub_roots; + find_32bit_roots (l.objidx, sub_roots); + if (sub_roots) { + for (unsigned sub_root_idx : sub_roots) { + roots.add (sub_root_idx); + find_subgraph (sub_root_idx, visited); + } + continue; + } + } + + roots.add (l.objidx); + find_subgraph (l.objidx, visited); + } + } + } + + template <typename T, typename ...Ts> + vertex_and_table_t<T> as_table (unsigned parent, const void* offset, Ts... ds) + { + return as_table_from_index<T> (index_for_offset (parent, offset), std::forward<Ts>(ds)...); + } + + template <typename T, typename ...Ts> + vertex_and_table_t<T> as_mutable_table (unsigned parent, const void* offset, Ts... ds) + { + return as_table_from_index<T> (mutable_index_for_offset (parent, offset), std::forward<Ts>(ds)...); + } + + template <typename T, typename ...Ts> + vertex_and_table_t<T> as_table_from_index (unsigned index, Ts... ds) + { + if (index >= vertices_.length) + return vertex_and_table_t<T> (); + + vertex_and_table_t<T> r; + r.vertex = &vertices_[index]; + r.table = (T*) r.vertex->obj.head; + r.index = index; + if (!r.table) + return vertex_and_table_t<T> (); + + if (!r.table->sanitize (*(r.vertex), std::forward<Ts>(ds)...)) + return vertex_and_table_t<T> (); + + return r; + } + + // Finds the object id of the object pointed to by the offset at 'offset' + // within object[node_idx]. + unsigned index_for_offset (unsigned node_idx, const void* offset) const + { + const auto& node = object (node_idx); + if (offset < node.head || offset >= node.tail) return -1; + + unsigned count = node.real_links.length; + for (unsigned i = 0; i < count; i++) + { + // Use direct access for increased performance, this is a hot method. + const auto& link = node.real_links.arrayZ[i]; + if (offset != node.head + link.position) + continue; + return link.objidx; + } + + return -1; + } + + // Finds the object id of the object pointed to by the offset at 'offset' + // within object[node_idx]. Ensures that the returned object is safe to mutate. + // That is, if the original child object is shared by parents other than node_idx + // it will be duplicated and the duplicate will be returned instead. + unsigned mutable_index_for_offset (unsigned node_idx, const void* offset) + { + unsigned child_idx = index_for_offset (node_idx, offset); + auto& child = vertices_[child_idx]; + for (unsigned p : child.parents_iter ()) + { + if (p != node_idx) { + return duplicate (node_idx, child_idx); + } + } + + return child_idx; + } + + + /* + * Assign unique space numbers to each connected subgraph of 24 bit and/or 32 bit offset(s). + * Currently, this is implemented specifically tailored to the structure of a GPOS/GSUB + * (including with 24bit offsets) table. + */ + bool assign_spaces () + { + update_parents (); + + hb_set_t visited; + hb_set_t roots; + find_space_roots (visited, roots); + + // Mark everything not in the subgraphs of the roots as visited. This prevents + // subgraphs from being connected via nodes not in those subgraphs. + visited.invert (); + + if (!roots) return false; + + while (roots) + { + uint32_t next = HB_SET_VALUE_INVALID; + if (unlikely (!check_success (!roots.in_error ()))) break; + if (!roots.next (&next)) break; + + hb_set_t connected_roots; + find_connected_nodes (next, roots, visited, connected_roots); + if (unlikely (!check_success (!connected_roots.in_error ()))) break; + + isolate_subgraph (connected_roots); + if (unlikely (!check_success (!connected_roots.in_error ()))) break; + + unsigned next_space = this->next_space (); + num_roots_for_space_.push (0); + for (unsigned root : connected_roots) + { + DEBUG_MSG (SUBSET_REPACK, nullptr, "Subgraph %u gets space %u", root, next_space); + vertices_[root].space = next_space; + num_roots_for_space_[next_space] = num_roots_for_space_[next_space] + 1; + distance_invalid = true; + positions_invalid = true; + } + + // TODO(grieger): special case for GSUB/GPOS use extension promotions to move 16 bit space + // into the 32 bit space as needed, instead of using isolation. + } + + + + return true; + } + + /* + * Isolates the subgraph of nodes reachable from root. Any links to nodes in the subgraph + * that originate from outside of the subgraph will be removed by duplicating the linked to + * object. + * + * Indices stored in roots will be updated if any of the roots are duplicated to new indices. + */ + bool isolate_subgraph (hb_set_t& roots) + { + update_parents (); + hb_map_t subgraph; + + // incoming edges to root_idx should be all 32 bit in length so we don't need to de-dup these + // set the subgraph incoming edge count to match all of root_idx's incoming edges + hb_set_t parents; + for (unsigned root_idx : roots) + { + subgraph.set (root_idx, wide_parents (root_idx, parents)); + find_subgraph (root_idx, subgraph); + } + if (subgraph.in_error ()) + return false; + + unsigned original_root_idx = root_idx (); + hb_map_t index_map; + bool made_changes = false; + for (auto entry : subgraph.iter ()) + { + assert (entry.first < vertices_.length); + const auto& node = vertices_[entry.first]; + unsigned subgraph_incoming_edges = entry.second; + + if (subgraph_incoming_edges < node.incoming_edges ()) + { + // Only de-dup objects with incoming links from outside the subgraph. + made_changes = true; + duplicate_subgraph (entry.first, index_map); + } + } + + if (in_error ()) + return false; + + if (!made_changes) + return false; + + if (original_root_idx != root_idx () + && parents.has (original_root_idx)) + { + // If the root idx has changed since parents was determined, update root idx in parents + parents.add (root_idx ()); + parents.del (original_root_idx); + } + + auto new_subgraph = + + subgraph.keys () + | hb_map([&] (uint32_t node_idx) { + const uint32_t *v; + if (index_map.has (node_idx, &v)) return *v; + return node_idx; + }) + ; + + remap_obj_indices (index_map, new_subgraph); + remap_obj_indices (index_map, parents.iter (), true); + + // Update roots set with new indices as needed. + for (auto next : roots) + { + const uint32_t *v; + if (index_map.has (next, &v)) + { + roots.del (next); + roots.add (*v); + } + } + + return true; + } + + void find_subgraph (unsigned node_idx, hb_map_t& subgraph) + { + for (const auto& link : vertices_[node_idx].obj.all_links ()) + { + hb_codepoint_t *v; + if (subgraph.has (link.objidx, &v)) + { + (*v)++; + continue; + } + subgraph.set (link.objidx, 1); + find_subgraph (link.objidx, subgraph); + } + } + + void find_subgraph (unsigned node_idx, hb_set_t& subgraph) + { + if (subgraph.has (node_idx)) return; + subgraph.add (node_idx); + for (const auto& link : vertices_[node_idx].obj.all_links ()) + find_subgraph (link.objidx, subgraph); + } + + size_t find_subgraph_size (unsigned node_idx, hb_set_t& subgraph, unsigned max_depth = -1) + { + if (subgraph.has (node_idx)) return 0; + subgraph.add (node_idx); + + const auto& o = vertices_[node_idx].obj; + size_t size = o.tail - o.head; + if (max_depth == 0) + return size; + + for (const auto& link : o.all_links ()) + size += find_subgraph_size (link.objidx, subgraph, max_depth - 1); + return size; + } + + /* + * Finds the topmost children of 32bit offsets in the subgraph starting + * at node_idx. Found indices are placed into 'found'. + */ + void find_32bit_roots (unsigned node_idx, hb_set_t& found) + { + for (const auto& link : vertices_[node_idx].obj.all_links ()) + { + if (!link.is_signed && link.width == 4) { + found.add (link.objidx); + continue; + } + find_32bit_roots (link.objidx, found); + } + } + + /* + * Moves the child of old_parent_idx pointed to by old_offset to a new + * vertex at the new_offset. + */ + template<typename O> + void move_child (unsigned old_parent_idx, + const O* old_offset, + unsigned new_parent_idx, + const O* new_offset) + { + distance_invalid = true; + positions_invalid = true; + + auto& old_v = vertices_[old_parent_idx]; + auto& new_v = vertices_[new_parent_idx]; + + unsigned child_id = index_for_offset (old_parent_idx, + old_offset); + + auto* new_link = new_v.obj.real_links.push (); + new_link->width = O::static_size; + new_link->objidx = child_id; + new_link->position = (const char*) new_offset - (const char*) new_v.obj.head; + + auto& child = vertices_[child_id]; + child.add_parent (new_parent_idx); + + old_v.remove_real_link (child_id, old_offset); + child.remove_parent (old_parent_idx); + } + + /* + * duplicates all nodes in the subgraph reachable from node_idx. Does not re-assign + * links. index_map is updated with mappings from old id to new id. If a duplication has already + * been performed for a given index, then it will be skipped. + */ + void duplicate_subgraph (unsigned node_idx, hb_map_t& index_map) + { + if (index_map.has (node_idx)) + return; + + unsigned clone_idx = duplicate (node_idx); + if (!check_success (clone_idx != (unsigned) -1)) + return; + + index_map.set (node_idx, clone_idx); + for (const auto& l : object (node_idx).all_links ()) { + duplicate_subgraph (l.objidx, index_map); + } + } + + /* + * Creates a copy of node_idx and returns it's new index. + */ + unsigned duplicate (unsigned node_idx) + { + positions_invalid = true; + distance_invalid = true; + + auto* clone = vertices_.push (); + auto& child = vertices_[node_idx]; + if (vertices_.in_error ()) { + return -1; + } + + clone->obj.head = child.obj.head; + clone->obj.tail = child.obj.tail; + clone->distance = child.distance; + clone->space = child.space; + clone->reset_parents (); + + unsigned clone_idx = vertices_.length - 2; + for (const auto& l : child.obj.real_links) + { + clone->obj.real_links.push (l); + vertices_[l.objidx].add_parent (clone_idx); + } + for (const auto& l : child.obj.virtual_links) + { + clone->obj.virtual_links.push (l); + vertices_[l.objidx].add_parent (clone_idx); + } + + check_success (!clone->obj.real_links.in_error ()); + check_success (!clone->obj.virtual_links.in_error ()); + + // The last object is the root of the graph, so swap back the root to the end. + // The root's obj idx does change, however since it's root nothing else refers to it. + // all other obj idx's will be unaffected. + hb_swap (vertices_[vertices_.length - 2], *clone); + + // Since the root moved, update the parents arrays of all children on the root. + for (const auto& l : root ().obj.all_links ()) + vertices_[l.objidx].remap_parent (root_idx () - 1, root_idx ()); + + return clone_idx; + } + + /* + * Creates a copy of child and re-assigns the link from + * parent to the clone. The copy is a shallow copy, objects + * linked from child are not duplicated. + */ + unsigned duplicate_if_shared (unsigned parent_idx, unsigned child_idx) + { + unsigned new_idx = duplicate (parent_idx, child_idx); + if (new_idx == (unsigned) -1) return child_idx; + return new_idx; + } + + + /* + * Creates a copy of child and re-assigns the link from + * parent to the clone. The copy is a shallow copy, objects + * linked from child are not duplicated. + */ + unsigned duplicate (unsigned parent_idx, unsigned child_idx) + { + update_parents (); + + unsigned links_to_child = 0; + for (const auto& l : vertices_[parent_idx].obj.all_links ()) + { + if (l.objidx == child_idx) links_to_child++; + } + + if (vertices_[child_idx].incoming_edges () <= links_to_child) + { + // Can't duplicate this node, doing so would orphan the original one as all remaining links + // to child are from parent. + DEBUG_MSG (SUBSET_REPACK, nullptr, " Not duplicating %u => %u", + parent_idx, child_idx); + return -1; + } + + DEBUG_MSG (SUBSET_REPACK, nullptr, " Duplicating %u => %u", + parent_idx, child_idx); + + unsigned clone_idx = duplicate (child_idx); + if (clone_idx == (unsigned) -1) return false; + // duplicate shifts the root node idx, so if parent_idx was root update it. + if (parent_idx == clone_idx) parent_idx++; + + auto& parent = vertices_[parent_idx]; + for (auto& l : parent.obj.all_links_writer ()) + { + if (l.objidx != child_idx) + continue; + + reassign_link (l, parent_idx, clone_idx); + } + + return clone_idx; + } + + + /* + * Adds a new node to the graph, not connected to anything. + */ + unsigned new_node (char* head, char* tail) + { + positions_invalid = true; + distance_invalid = true; + + auto* clone = vertices_.push (); + if (vertices_.in_error ()) { + return -1; + } + + clone->obj.head = head; + clone->obj.tail = tail; + clone->distance = 0; + clone->space = 0; + + unsigned clone_idx = vertices_.length - 2; + + // The last object is the root of the graph, so swap back the root to the end. + // The root's obj idx does change, however since it's root nothing else refers to it. + // all other obj idx's will be unaffected. + hb_swap (vertices_[vertices_.length - 2], *clone); + + // Since the root moved, update the parents arrays of all children on the root. + for (const auto& l : root ().obj.all_links ()) + vertices_[l.objidx].remap_parent (root_idx () - 1, root_idx ()); + + return clone_idx; + } + + /* + * Raises the sorting priority of all children. + */ + bool raise_childrens_priority (unsigned parent_idx) + { + DEBUG_MSG (SUBSET_REPACK, nullptr, " Raising priority of all children of %u", + parent_idx); + // This operation doesn't change ordering until a sort is run, so no need + // to invalidate positions. It does not change graph structure so no need + // to update distances or edge counts. + auto& parent = vertices_[parent_idx].obj; + bool made_change = false; + for (auto& l : parent.all_links_writer ()) + made_change |= vertices_[l.objidx].raise_priority (); + return made_change; + } + + bool is_fully_connected () + { + update_parents(); + + if (root().incoming_edges ()) + // Root cannot have parents. + return false; + + for (unsigned i = 0; i < root_idx (); i++) + { + if (!vertices_[i].incoming_edges ()) + return false; + } + return true; + } + +#if 0 + /* + * Saves the current graph to a packed binary format which the repacker fuzzer takes + * as a seed. + */ + void save_fuzzer_seed (hb_tag_t tag) const + { + FILE* f = fopen ("./repacker_fuzzer_seed", "w"); + fwrite ((void*) &tag, sizeof (tag), 1, f); + + uint16_t num_objects = vertices_.length; + fwrite ((void*) &num_objects, sizeof (num_objects), 1, f); + + for (const auto& v : vertices_) + { + uint16_t blob_size = v.table_size (); + fwrite ((void*) &blob_size, sizeof (blob_size), 1, f); + fwrite ((const void*) v.obj.head, blob_size, 1, f); + } + + uint16_t link_count = 0; + for (const auto& v : vertices_) + link_count += v.obj.real_links.length; + + fwrite ((void*) &link_count, sizeof (link_count), 1, f); + + typedef struct + { + uint16_t parent; + uint16_t child; + uint16_t position; + uint8_t width; + } link_t; + + for (unsigned i = 0; i < vertices_.length; i++) + { + for (const auto& l : vertices_[i].obj.real_links) + { + link_t link { + (uint16_t) i, (uint16_t) l.objidx, + (uint16_t) l.position, (uint8_t) l.width + }; + fwrite ((void*) &link, sizeof (link), 1, f); + } + } + + fclose (f); + } +#endif + + void print_orphaned_nodes () + { + if (!DEBUG_ENABLED(SUBSET_REPACK)) return; + + DEBUG_MSG (SUBSET_REPACK, nullptr, "Graph is not fully connected."); + parents_invalid = true; + update_parents(); + + if (root().incoming_edges ()) { + DEBUG_MSG (SUBSET_REPACK, nullptr, "Root node has incoming edges."); + } + + for (unsigned i = 0; i < root_idx (); i++) + { + const auto& v = vertices_[i]; + if (!v.incoming_edges ()) + DEBUG_MSG (SUBSET_REPACK, nullptr, "Node %u is orphaned.", i); + } + } + + unsigned num_roots_for_space (unsigned space) const + { + return num_roots_for_space_[space]; + } + + unsigned next_space () const + { + return num_roots_for_space_.length; + } + + void move_to_new_space (const hb_set_t& indices) + { + num_roots_for_space_.push (0); + unsigned new_space = num_roots_for_space_.length - 1; + + for (unsigned index : indices) { + auto& node = vertices_[index]; + num_roots_for_space_[node.space] = num_roots_for_space_[node.space] - 1; + num_roots_for_space_[new_space] = num_roots_for_space_[new_space] + 1; + node.space = new_space; + distance_invalid = true; + positions_invalid = true; + } + } + + unsigned space_for (unsigned index, unsigned* root = nullptr) const + { + loop: + assert (index < vertices_.length); + const auto& node = vertices_[index]; + if (node.space) + { + if (root != nullptr) + *root = index; + return node.space; + } + + if (!node.incoming_edges ()) + { + if (root) + *root = index; + return 0; + } + + index = *node.parents_iter (); + goto loop; + } + + void err_other_error () { this->successful = false; } + + size_t total_size_in_bytes () const { + size_t total_size = 0; + unsigned count = vertices_.length; + for (unsigned i = 0; i < count; i++) { + size_t size = vertices_.arrayZ[i].obj.tail - vertices_.arrayZ[i].obj.head; + total_size += size; + } + return total_size; + } + + + private: + + /* + * Returns the numbers of incoming edges that are 24 or 32 bits wide. + */ + unsigned wide_parents (unsigned node_idx, hb_set_t& parents) const + { + unsigned count = 0; + for (unsigned p : vertices_[node_idx].parents_iter ()) + { + // Only real links can be wide + for (const auto& l : vertices_[p].obj.real_links) + { + if (l.objidx == node_idx + && (l.width == 3 || l.width == 4) + && !l.is_signed) + { + count++; + parents.add (p); + } + } + } + return count; + } + + bool check_success (bool success) + { return this->successful && (success || ((void) err_other_error (), false)); } + + public: + /* + * Creates a map from objid to # of incoming edges. + */ + void update_parents () + { + if (!parents_invalid) return; + + unsigned count = vertices_.length; + + for (unsigned i = 0; i < count; i++) + vertices_.arrayZ[i].reset_parents (); + + for (unsigned p = 0; p < count; p++) + { + for (auto& l : vertices_.arrayZ[p].obj.all_links ()) + vertices_[l.objidx].add_parent (p); + } + + for (unsigned i = 0; i < count; i++) + // parents arrays must be accurate or downstream operations like cycle detection + // and sorting won't work correctly. + check_success (!vertices_.arrayZ[i].in_error ()); + + parents_invalid = false; + } + + /* + * compute the serialized start and end positions for each vertex. + */ + void update_positions () + { + if (!positions_invalid) return; + + unsigned current_pos = 0; + for (int i = root_idx (); i >= 0; i--) + { + auto& v = vertices_[i]; + v.start = current_pos; + current_pos += v.obj.tail - v.obj.head; + v.end = current_pos; + } + + positions_invalid = false; + } + + /* + * Finds the distance to each object in the graph + * from the initial node. + */ + void update_distances () + { + if (!distance_invalid) return; + + // Uses Dijkstra's algorithm to find all of the shortest distances. + // https://en.wikipedia.org/wiki/Dijkstra%27s_algorithm + // + // Implementation Note: + // Since our priority queue doesn't support fast priority decreases + // we instead just add new entries into the queue when a priority changes. + // Redundant ones are filtered out later on by the visited set. + // According to https://www3.cs.stonybrook.edu/~rezaul/papers/TR-07-54.pdf + // for practical performance this is faster then using a more advanced queue + // (such as a fibonacci queue) with a fast decrease priority. + unsigned count = vertices_.length; + for (unsigned i = 0; i < count; i++) + vertices_.arrayZ[i].distance = hb_int_max (int64_t); + vertices_.tail ().distance = 0; + + hb_priority_queue_t<int64_t> queue; + queue.alloc (count); + queue.insert (0, vertices_.length - 1); + + hb_vector_t<bool> visited; + visited.resize (vertices_.length); + + while (!queue.in_error () && !queue.is_empty ()) + { + unsigned next_idx = queue.pop_minimum ().second; + if (visited[next_idx]) continue; + const auto& next = vertices_[next_idx]; + int64_t next_distance = vertices_[next_idx].distance; + visited[next_idx] = true; + + for (const auto& link : next.obj.all_links ()) + { + if (visited[link.objidx]) continue; + + const auto& child = vertices_.arrayZ[link.objidx].obj; + unsigned link_width = link.width ? link.width : 4; // treat virtual offsets as 32 bits wide + int64_t child_weight = (child.tail - child.head) + + ((int64_t) 1 << (link_width * 8)) * (vertices_.arrayZ[link.objidx].space + 1); + int64_t child_distance = next_distance + child_weight; + + if (child_distance < vertices_.arrayZ[link.objidx].distance) + { + vertices_.arrayZ[link.objidx].distance = child_distance; + queue.insert (child_distance, link.objidx); + } + } + } + + check_success (!queue.in_error ()); + if (!check_success (queue.is_empty ())) + { + print_orphaned_nodes (); + return; + } + + distance_invalid = false; + } + + private: + /* + * Updates a link in the graph to point to a different object. Corrects the + * parents vector on the previous and new child nodes. + */ + void reassign_link (hb_serialize_context_t::object_t::link_t& link, + unsigned parent_idx, + unsigned new_idx) + { + unsigned old_idx = link.objidx; + link.objidx = new_idx; + vertices_[old_idx].remove_parent (parent_idx); + vertices_[new_idx].add_parent (parent_idx); + } + + /* + * Updates all objidx's in all links using the provided mapping. Corrects incoming edge counts. + */ + template<typename Iterator, hb_requires (hb_is_iterator (Iterator))> + void remap_obj_indices (const hb_map_t& id_map, + Iterator subgraph, + bool only_wide = false) + { + if (!id_map) return; + for (unsigned i : subgraph) + { + for (auto& link : vertices_[i].obj.all_links_writer ()) + { + const uint32_t *v; + if (!id_map.has (link.objidx, &v)) continue; + if (only_wide && !(link.width == 4 && !link.is_signed)) continue; + + reassign_link (link, i, *v); + } + } + } + + /* + * Updates all objidx's in all links using the provided mapping. + */ + bool remap_all_obj_indices (const hb_vector_t<unsigned>& id_map, + hb_vector_t<vertex_t>* sorted_graph) const + { + unsigned count = sorted_graph->length; + for (unsigned i = 0; i < count; i++) + { + if (!(*sorted_graph)[i].remap_parents (id_map)) + return false; + for (auto& link : sorted_graph->arrayZ[i].obj.all_links_writer ()) + { + link.objidx = id_map[link.objidx]; + } + } + return true; + } + + /* + * Finds all nodes in targets that are reachable from start_idx, nodes in visited will be skipped. + * For this search the graph is treated as being undirected. + * + * Connected targets will be added to connected and removed from targets. All visited nodes + * will be added to visited. + */ + void find_connected_nodes (unsigned start_idx, + hb_set_t& targets, + hb_set_t& visited, + hb_set_t& connected) + { + if (unlikely (!check_success (!visited.in_error ()))) return; + if (visited.has (start_idx)) return; + visited.add (start_idx); + + if (targets.has (start_idx)) + { + targets.del (start_idx); + connected.add (start_idx); + } + + const auto& v = vertices_[start_idx]; + + // Graph is treated as undirected so search children and parents of start_idx + for (const auto& l : v.obj.all_links ()) + find_connected_nodes (l.objidx, targets, visited, connected); + + for (unsigned p : v.parents_iter ()) + find_connected_nodes (p, targets, visited, connected); + } + + public: + // TODO(garretrieger): make private, will need to move most of offset overflow code into graph. + hb_vector_t<vertex_t> vertices_; + hb_vector_t<vertex_t> vertices_scratch_; + private: + bool parents_invalid; + bool distance_invalid; + bool positions_invalid; + bool successful; + hb_vector_t<unsigned> num_roots_for_space_; + hb_vector_t<char*> buffers; +}; + +} + +#endif // GRAPH_GRAPH_HH diff --git a/gfx/harfbuzz/src/graph/gsubgpos-context.cc b/gfx/harfbuzz/src/graph/gsubgpos-context.cc new file mode 100644 index 0000000000..d66eb49cfd --- /dev/null +++ b/gfx/harfbuzz/src/graph/gsubgpos-context.cc @@ -0,0 +1,74 @@ +/* + * 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 { + +gsubgpos_graph_context_t::gsubgpos_graph_context_t (hb_tag_t table_tag_, + graph_t& graph_) + : table_tag (table_tag_), + graph (graph_), + lookup_list_index (0), + lookups () +{ + if (table_tag_ != HB_OT_TAG_GPOS + && table_tag_ != HB_OT_TAG_GSUB) + return; + + GSTAR* gstar = graph::GSTAR::graph_to_gstar (graph_); + if (gstar) { + gstar->find_lookups (graph, lookups); + lookup_list_index = gstar->get_lookup_list_index (graph_); + } +} + +unsigned gsubgpos_graph_context_t::create_node (unsigned size) +{ + char* buffer = (char*) hb_calloc (1, size); + if (!buffer) + return -1; + + if (!add_buffer (buffer)) { + // Allocation did not get stored for freeing later. + hb_free (buffer); + return -1; + } + + return graph.new_node (buffer, buffer + size); +} + +unsigned gsubgpos_graph_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; +} + +} diff --git a/gfx/harfbuzz/src/graph/gsubgpos-context.hh b/gfx/harfbuzz/src/graph/gsubgpos-context.hh new file mode 100644 index 0000000000..b25d538fe3 --- /dev/null +++ b/gfx/harfbuzz/src/graph/gsubgpos-context.hh @@ -0,0 +1,61 @@ +/* + * 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 "../hb-ot-layout-gsubgpos.hh" + +#ifndef GRAPH_GSUBGPOS_CONTEXT_HH +#define GRAPH_GSUBGPOS_CONTEXT_HH + +namespace graph { + +struct Lookup; + +struct gsubgpos_graph_context_t +{ + hb_tag_t table_tag; + graph_t& graph; + unsigned lookup_list_index; + hb_hashmap_t<unsigned, graph::Lookup*> lookups; + hb_hashmap_t<unsigned, unsigned> subtable_to_extension; + + HB_INTERNAL gsubgpos_graph_context_t (hb_tag_t table_tag_, + graph_t& graph_); + + HB_INTERNAL unsigned create_node (unsigned size); + + bool add_buffer (char* buffer) + { + return graph.add_buffer (buffer); + } + + private: + HB_INTERNAL unsigned num_non_ext_subtables (); +}; + +} + +#endif // GRAPH_GSUBGPOS_CONTEXT diff --git a/gfx/harfbuzz/src/graph/gsubgpos-graph.hh b/gfx/harfbuzz/src/graph/gsubgpos-graph.hh new file mode 100644 index 0000000000..0f6d5662e0 --- /dev/null +++ b/gfx/harfbuzz/src/graph/gsubgpos-graph.hh @@ -0,0 +1,435 @@ +/* + * 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 "../hb-ot-layout-gsubgpos.hh" +#include "../OT/Layout/GSUB/ExtensionSubst.hh" +#include "gsubgpos-context.hh" +#include "pairpos-graph.hh" +#include "markbasepos-graph.hh" + +#ifndef GRAPH_GSUBGPOS_GRAPH_HH +#define GRAPH_GSUBGPOS_GRAPH_HH + +namespace graph { + +struct Lookup; + +template<typename T> +struct ExtensionFormat1 : public OT::ExtensionFormat1<T> +{ + void reset(unsigned type) + { + this->format = 1; + this->extensionLookupType = type; + this->extensionOffset = 0; + } + + bool sanitize (graph_t::vertex_t& vertex) const + { + int64_t vertex_len = vertex.obj.tail - vertex.obj.head; + return vertex_len >= OT::ExtensionFormat1<T>::static_size; + } + + unsigned get_lookup_type () const + { + return this->extensionLookupType; + } + + unsigned get_subtable_index (graph_t& graph, unsigned this_index) const + { + return graph.index_for_offset (this_index, &this->extensionOffset); + } +}; + +struct Lookup : public OT::Lookup +{ + unsigned number_of_subtables () const + { + return subTable.len; + } + + bool sanitize (graph_t::vertex_t& vertex) const + { + int64_t vertex_len = vertex.obj.tail - vertex.obj.head; + if (vertex_len < OT::Lookup::min_size) return false; + hb_barrier (); + return vertex_len >= this->get_size (); + } + + bool is_extension (hb_tag_t table_tag) const + { + return lookupType == extension_type (table_tag); + } + + bool make_extension (gsubgpos_graph_context_t& c, + unsigned this_index) + { + unsigned type = lookupType; + unsigned ext_type = extension_type (c.table_tag); + if (!ext_type || is_extension (c.table_tag)) + { + // NOOP + return true; + } + + DEBUG_MSG (SUBSET_REPACK, nullptr, + "Promoting lookup type %u (obj %u) to extension.", + type, + this_index); + + for (unsigned i = 0; i < subTable.len; i++) + { + unsigned subtable_index = c.graph.index_for_offset (this_index, &subTable[i]); + if (!make_subtable_extension (c, + this_index, + subtable_index)) + return false; + } + + lookupType = ext_type; + return true; + } + + bool split_subtables_if_needed (gsubgpos_graph_context_t& c, + unsigned this_index) + { + unsigned type = lookupType; + bool is_ext = is_extension (c.table_tag); + + if (c.table_tag != HB_OT_TAG_GPOS) + return true; + + if (!is_ext && + type != OT::Layout::GPOS_impl::PosLookupSubTable::Type::Pair && + type != OT::Layout::GPOS_impl::PosLookupSubTable::Type::MarkBase) + return true; + + hb_vector_t<hb_pair_t<unsigned, hb_vector_t<unsigned>>> all_new_subtables; + for (unsigned i = 0; i < subTable.len; i++) + { + unsigned subtable_index = c.graph.index_for_offset (this_index, &subTable[i]); + unsigned parent_index = this_index; + if (is_ext) { + unsigned ext_subtable_index = subtable_index; + parent_index = ext_subtable_index; + ExtensionFormat1<OT::Layout::GSUB_impl::ExtensionSubst>* extension = + (ExtensionFormat1<OT::Layout::GSUB_impl::ExtensionSubst>*) + c.graph.object (ext_subtable_index).head; + if (!extension || !extension->sanitize (c.graph.vertices_[ext_subtable_index])) + continue; + + subtable_index = extension->get_subtable_index (c.graph, ext_subtable_index); + type = extension->get_lookup_type (); + if (type != OT::Layout::GPOS_impl::PosLookupSubTable::Type::Pair + && type != OT::Layout::GPOS_impl::PosLookupSubTable::Type::MarkBase) + continue; + } + + hb_vector_t<unsigned> new_sub_tables; + switch (type) + { + case 2: + new_sub_tables = split_subtable<PairPos> (c, parent_index, subtable_index); break; + case 4: + new_sub_tables = split_subtable<MarkBasePos> (c, parent_index, subtable_index); break; + default: + break; + } + if (new_sub_tables.in_error ()) return false; + if (!new_sub_tables) continue; + hb_pair_t<unsigned, hb_vector_t<unsigned>>* entry = all_new_subtables.push (); + entry->first = i; + entry->second = std::move (new_sub_tables); + } + + if (all_new_subtables) { + return add_sub_tables (c, this_index, type, all_new_subtables); + } + + return true; + } + + template<typename T> + hb_vector_t<unsigned> split_subtable (gsubgpos_graph_context_t& c, + unsigned parent_idx, + unsigned objidx) + { + T* sub_table = (T*) c.graph.object (objidx).head; + if (!sub_table || !sub_table->sanitize (c.graph.vertices_[objidx])) + return hb_vector_t<unsigned> (); + + return sub_table->split_subtables (c, parent_idx, objidx); + } + + bool add_sub_tables (gsubgpos_graph_context_t& c, + unsigned this_index, + unsigned type, + hb_vector_t<hb_pair_t<unsigned, hb_vector_t<unsigned>>>& subtable_ids) + { + bool is_ext = is_extension (c.table_tag); + auto& v = c.graph.vertices_[this_index]; + fix_existing_subtable_links (c, this_index, subtable_ids); + + unsigned new_subtable_count = 0; + for (const auto& p : subtable_ids) + new_subtable_count += p.second.length; + + size_t new_size = v.table_size () + + new_subtable_count * OT::Offset16::static_size; + char* buffer = (char*) hb_calloc (1, new_size); + if (!buffer) return false; + if (!c.add_buffer (buffer)) + { + hb_free (buffer); + return false; + } + hb_memcpy (buffer, v.obj.head, v.table_size()); + + v.obj.head = buffer; + v.obj.tail = buffer + new_size; + + Lookup* new_lookup = (Lookup*) buffer; + + unsigned shift = 0; + new_lookup->subTable.len = subTable.len + new_subtable_count; + for (const auto& p : subtable_ids) + { + unsigned offset_index = p.first + shift + 1; + shift += p.second.length; + + for (unsigned subtable_id : p.second) + { + if (is_ext) + { + unsigned ext_id = create_extension_subtable (c, subtable_id, type); + c.graph.vertices_[subtable_id].add_parent (ext_id); + subtable_id = ext_id; + } + + auto* link = v.obj.real_links.push (); + link->width = 2; + link->objidx = subtable_id; + link->position = (char*) &new_lookup->subTable[offset_index++] - + (char*) new_lookup; + c.graph.vertices_[subtable_id].add_parent (this_index); + } + } + + // Repacker sort order depends on link order, which we've messed up so resort it. + v.obj.real_links.qsort (); + + // The head location of the lookup has changed, invalidating the lookups map entry + // in the context. Update the map. + c.lookups.set (this_index, new_lookup); + return true; + } + + void fix_existing_subtable_links (gsubgpos_graph_context_t& c, + unsigned this_index, + hb_vector_t<hb_pair_t<unsigned, hb_vector_t<unsigned>>>& subtable_ids) + { + auto& v = c.graph.vertices_[this_index]; + Lookup* lookup = (Lookup*) v.obj.head; + + unsigned shift = 0; + for (const auto& p : subtable_ids) + { + unsigned insert_index = p.first + shift; + unsigned pos_offset = p.second.length * OT::Offset16::static_size; + unsigned insert_offset = (char*) &lookup->subTable[insert_index] - (char*) lookup; + shift += p.second.length; + + for (auto& l : v.obj.all_links_writer ()) + { + if (l.position > insert_offset) l.position += pos_offset; + } + } + } + + unsigned create_extension_subtable (gsubgpos_graph_context_t& c, + unsigned subtable_index, + unsigned type) + { + unsigned extension_size = OT::ExtensionFormat1<OT::Layout::GSUB_impl::ExtensionSubst>::static_size; + + unsigned ext_index = c.create_node (extension_size); + if (ext_index == (unsigned) -1) + return -1; + + auto& ext_vertex = c.graph.vertices_[ext_index]; + ExtensionFormat1<OT::Layout::GSUB_impl::ExtensionSubst>* extension = + (ExtensionFormat1<OT::Layout::GSUB_impl::ExtensionSubst>*) ext_vertex.obj.head; + extension->reset (type); + + // Make extension point at the subtable. + auto* l = ext_vertex.obj.real_links.push (); + + l->width = 4; + l->objidx = subtable_index; + l->position = 4; + + return ext_index; + } + + bool make_subtable_extension (gsubgpos_graph_context_t& c, + unsigned lookup_index, + unsigned subtable_index) + { + unsigned type = lookupType; + unsigned ext_index = -1; + unsigned* existing_ext_index = nullptr; + if (c.subtable_to_extension.has(subtable_index, &existing_ext_index)) { + ext_index = *existing_ext_index; + } else { + ext_index = create_extension_subtable(c, subtable_index, type); + c.subtable_to_extension.set(subtable_index, ext_index); + } + + if (ext_index == (unsigned) -1) + return false; + + auto& subtable_vertex = c.graph.vertices_[subtable_index]; + auto& lookup_vertex = c.graph.vertices_[lookup_index]; + for (auto& l : lookup_vertex.obj.real_links.writer ()) + { + if (l.objidx == subtable_index) { + // Change lookup to point at the extension. + l.objidx = ext_index; + if (existing_ext_index) + subtable_vertex.remove_parent(lookup_index); + } + } + + // Make extension point at the subtable. + auto& ext_vertex = c.graph.vertices_[ext_index]; + ext_vertex.add_parent (lookup_index); + if (!existing_ext_index) + subtable_vertex.remap_parent (lookup_index, ext_index); + + return true; + } + + private: + unsigned extension_type (hb_tag_t table_tag) const + { + switch (table_tag) + { + case HB_OT_TAG_GPOS: return 9; + case HB_OT_TAG_GSUB: return 7; + default: return 0; + } + } +}; + +template <typename T> +struct LookupList : public OT::LookupList<T> +{ + bool sanitize (const graph_t::vertex_t& vertex) const + { + int64_t vertex_len = vertex.obj.tail - vertex.obj.head; + if (vertex_len < OT::LookupList<T>::min_size) return false; + hb_barrier (); + return vertex_len >= OT::LookupList<T>::item_size * this->len; + } +}; + +struct GSTAR : public OT::GSUBGPOS +{ + static GSTAR* graph_to_gstar (graph_t& graph) + { + const auto& r = graph.root (); + + GSTAR* gstar = (GSTAR*) r.obj.head; + if (!gstar || !gstar->sanitize (r)) + return nullptr; + hb_barrier (); + + return gstar; + } + + const void* get_lookup_list_field_offset () const + { + switch (u.version.major) { + case 1: return u.version1.get_lookup_list_offset (); +#ifndef HB_NO_BEYOND_64K + case 2: return u.version2.get_lookup_list_offset (); +#endif + default: return 0; + } + } + + bool sanitize (const graph_t::vertex_t& vertex) + { + int64_t len = vertex.obj.tail - vertex.obj.head; + if (len < OT::GSUBGPOS::min_size) return false; + hb_barrier (); + return len >= get_size (); + } + + void find_lookups (graph_t& graph, + hb_hashmap_t<unsigned, Lookup*>& lookups /* OUT */) + { + switch (u.version.major) { + case 1: find_lookups<SmallTypes> (graph, lookups); break; +#ifndef HB_NO_BEYOND_64K + case 2: find_lookups<MediumTypes> (graph, lookups); break; +#endif + } + } + + unsigned get_lookup_list_index (graph_t& graph) + { + return graph.index_for_offset (graph.root_idx (), + get_lookup_list_field_offset()); + } + + template<typename Types> + void find_lookups (graph_t& graph, + hb_hashmap_t<unsigned, Lookup*>& lookups /* OUT */) + { + unsigned lookup_list_idx = get_lookup_list_index (graph); + const LookupList<Types>* lookupList = + (const LookupList<Types>*) graph.object (lookup_list_idx).head; + if (!lookupList || !lookupList->sanitize (graph.vertices_[lookup_list_idx])) + return; + + for (unsigned i = 0; i < lookupList->len; i++) + { + unsigned lookup_idx = graph.index_for_offset (lookup_list_idx, &(lookupList->arrayZ[i])); + Lookup* lookup = (Lookup*) graph.object (lookup_idx).head; + if (!lookup || !lookup->sanitize (graph.vertices_[lookup_idx])) continue; + lookups.set (lookup_idx, lookup); + } + } +}; + + + + +} + +#endif /* GRAPH_GSUBGPOS_GRAPH_HH */ diff --git a/gfx/harfbuzz/src/graph/markbasepos-graph.hh b/gfx/harfbuzz/src/graph/markbasepos-graph.hh new file mode 100644 index 0000000000..fb4166128a --- /dev/null +++ b/gfx/harfbuzz/src/graph/markbasepos-graph.hh @@ -0,0 +1,518 @@ +/* + * 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 + */ + +#ifndef GRAPH_MARKBASEPOS_GRAPH_HH +#define GRAPH_MARKBASEPOS_GRAPH_HH + +#include "split-helpers.hh" +#include "coverage-graph.hh" +#include "../OT/Layout/GPOS/MarkBasePos.hh" +#include "../OT/Layout/GPOS/PosLookupSubTable.hh" + +namespace graph { + +struct AnchorMatrix : public OT::Layout::GPOS_impl::AnchorMatrix +{ + bool sanitize (graph_t::vertex_t& vertex, unsigned class_count) const + { + int64_t vertex_len = vertex.obj.tail - vertex.obj.head; + if (vertex_len < AnchorMatrix::min_size) return false; + hb_barrier (); + + return vertex_len >= AnchorMatrix::min_size + + OT::Offset16::static_size * class_count * this->rows; + } + + bool shrink (gsubgpos_graph_context_t& c, + unsigned this_index, + unsigned old_class_count, + unsigned new_class_count) + { + if (new_class_count >= old_class_count) return false; + auto& o = c.graph.vertices_[this_index].obj; + unsigned base_count = rows; + o.tail = o.head + + AnchorMatrix::min_size + + OT::Offset16::static_size * base_count * new_class_count; + + // Reposition links into the new indexing scheme. + for (auto& link : o.real_links.writer ()) + { + unsigned index = (link.position - 2) / 2; + unsigned base = index / old_class_count; + unsigned klass = index % old_class_count; + if (klass >= new_class_count) + // should have already been removed + return false; + + unsigned new_index = base * new_class_count + klass; + + link.position = (char*) &(this->matrixZ[new_index]) - (char*) this; + } + + return true; + } + + unsigned clone (gsubgpos_graph_context_t& c, + unsigned this_index, + unsigned start, + unsigned end, + unsigned class_count) + { + unsigned base_count = rows; + unsigned new_class_count = end - start; + unsigned size = AnchorMatrix::min_size + + OT::Offset16::static_size * new_class_count * rows; + unsigned prime_id = c.create_node (size); + if (prime_id == (unsigned) -1) return -1; + AnchorMatrix* prime = (AnchorMatrix*) c.graph.object (prime_id).head; + prime->rows = base_count; + + auto& o = c.graph.vertices_[this_index].obj; + int num_links = o.real_links.length; + for (int i = 0; i < num_links; i++) + { + const auto& link = o.real_links[i]; + unsigned old_index = (link.position - 2) / OT::Offset16::static_size; + unsigned klass = old_index % class_count; + if (klass < start || klass >= end) continue; + + unsigned base = old_index / class_count; + unsigned new_klass = klass - start; + unsigned new_index = base * new_class_count + new_klass; + + + unsigned child_idx = link.objidx; + c.graph.add_link (&(prime->matrixZ[new_index]), + prime_id, + child_idx); + + auto& child = c.graph.vertices_[child_idx]; + child.remove_parent (this_index); + + o.real_links.remove_unordered (i); + num_links--; + i--; + } + + return prime_id; + } +}; + +struct MarkArray : public OT::Layout::GPOS_impl::MarkArray +{ + bool sanitize (graph_t::vertex_t& vertex) const + { + int64_t vertex_len = vertex.obj.tail - vertex.obj.head; + unsigned min_size = MarkArray::min_size; + if (vertex_len < min_size) return false; + hb_barrier (); + + return vertex_len >= get_size (); + } + + bool shrink (gsubgpos_graph_context_t& c, + const hb_hashmap_t<unsigned, unsigned>& mark_array_links, + unsigned this_index, + unsigned new_class_count) + { + auto& o = c.graph.vertices_[this_index].obj; + for (const auto& link : o.real_links) + c.graph.vertices_[link.objidx].remove_parent (this_index); + o.real_links.reset (); + + unsigned new_index = 0; + for (const auto& record : this->iter ()) + { + unsigned klass = record.klass; + if (klass >= new_class_count) continue; + + (*this)[new_index].klass = klass; + unsigned position = (char*) &record.markAnchor - (char*) this; + unsigned* objidx; + if (!mark_array_links.has (position, &objidx)) + { + new_index++; + continue; + } + + c.graph.add_link (&(*this)[new_index].markAnchor, this_index, *objidx); + new_index++; + } + + this->len = new_index; + o.tail = o.head + MarkArray::min_size + + OT::Layout::GPOS_impl::MarkRecord::static_size * new_index; + return true; + } + + unsigned clone (gsubgpos_graph_context_t& c, + unsigned this_index, + const hb_hashmap_t<unsigned, unsigned>& pos_to_index, + hb_set_t& marks, + unsigned start_class) + { + unsigned size = MarkArray::min_size + + OT::Layout::GPOS_impl::MarkRecord::static_size * + marks.get_population (); + unsigned prime_id = c.create_node (size); + if (prime_id == (unsigned) -1) return -1; + MarkArray* prime = (MarkArray*) c.graph.object (prime_id).head; + prime->len = marks.get_population (); + + + unsigned i = 0; + for (hb_codepoint_t mark : marks) + { + (*prime)[i].klass = (*this)[mark].klass - start_class; + unsigned offset_pos = (char*) &((*this)[mark].markAnchor) - (char*) this; + unsigned* anchor_index; + if (pos_to_index.has (offset_pos, &anchor_index)) + c.graph.move_child (this_index, + &((*this)[mark].markAnchor), + prime_id, + &((*prime)[i].markAnchor)); + + i++; + } + + return prime_id; + } +}; + +struct MarkBasePosFormat1 : public OT::Layout::GPOS_impl::MarkBasePosFormat1_2<SmallTypes> +{ + bool sanitize (graph_t::vertex_t& vertex) const + { + int64_t vertex_len = vertex.obj.tail - vertex.obj.head; + return vertex_len >= MarkBasePosFormat1::static_size; + } + + hb_vector_t<unsigned> split_subtables (gsubgpos_graph_context_t& c, + unsigned parent_index, + unsigned this_index) + { + hb_set_t visited; + + const unsigned base_coverage_id = c.graph.index_for_offset (this_index, &baseCoverage); + const unsigned base_size = + OT::Layout::GPOS_impl::MarkBasePosFormat1_2<SmallTypes>::min_size + + MarkArray::min_size + + AnchorMatrix::min_size + + c.graph.vertices_[base_coverage_id].table_size (); + + hb_vector_t<class_info_t> class_to_info = get_class_info (c, this_index); + + unsigned class_count = classCount; + auto base_array = c.graph.as_table<AnchorMatrix> (this_index, + &baseArray, + class_count); + if (!base_array) return hb_vector_t<unsigned> (); + unsigned base_count = base_array.table->rows; + + unsigned partial_coverage_size = 4; + unsigned accumulated = base_size; + hb_vector_t<unsigned> split_points; + + for (unsigned klass = 0; klass < class_count; klass++) + { + class_info_t& info = class_to_info[klass]; + partial_coverage_size += OT::HBUINT16::static_size * info.marks.get_population (); + unsigned accumulated_delta = + OT::Layout::GPOS_impl::MarkRecord::static_size * info.marks.get_population () + + OT::Offset16::static_size * base_count; + + for (unsigned objidx : info.child_indices) + accumulated_delta += c.graph.find_subgraph_size (objidx, visited); + + accumulated += accumulated_delta; + unsigned total = accumulated + partial_coverage_size; + + if (total >= (1 << 16)) + { + split_points.push (klass); + accumulated = base_size + accumulated_delta; + partial_coverage_size = 4 + OT::HBUINT16::static_size * info.marks.get_population (); + visited.clear (); // node sharing isn't allowed between splits. + } + } + + + const unsigned mark_array_id = c.graph.index_for_offset (this_index, &markArray); + split_context_t split_context { + c, + this, + c.graph.duplicate_if_shared (parent_index, this_index), + std::move (class_to_info), + c.graph.vertices_[mark_array_id].position_to_index_map (), + }; + + return actuate_subtable_split<split_context_t> (split_context, split_points); + } + + private: + + struct class_info_t { + hb_set_t marks; + hb_vector_t<unsigned> child_indices; + }; + + struct split_context_t { + gsubgpos_graph_context_t& c; + MarkBasePosFormat1* thiz; + unsigned this_index; + hb_vector_t<class_info_t> class_to_info; + hb_hashmap_t<unsigned, unsigned> mark_array_links; + + hb_set_t marks_for (unsigned start, unsigned end) + { + hb_set_t marks; + for (unsigned klass = start; klass < end; klass++) + { + + class_to_info[klass].marks.iter () + | hb_sink (marks) + ; + } + return marks; + } + + unsigned original_count () + { + return thiz->classCount; + } + + unsigned clone_range (unsigned start, unsigned end) + { + return thiz->clone_range (*this, this->this_index, start, end); + } + + bool shrink (unsigned count) + { + return thiz->shrink (*this, this->this_index, count); + } + }; + + hb_vector_t<class_info_t> get_class_info (gsubgpos_graph_context_t& c, + unsigned this_index) + { + hb_vector_t<class_info_t> class_to_info; + + unsigned class_count = classCount; + if (!class_count) return class_to_info; + + if (!class_to_info.resize (class_count)) + return hb_vector_t<class_info_t>(); + + auto mark_array = c.graph.as_table<MarkArray> (this_index, &markArray); + if (!mark_array) return hb_vector_t<class_info_t> (); + unsigned mark_count = mark_array.table->len; + for (unsigned mark = 0; mark < mark_count; mark++) + { + unsigned klass = (*mark_array.table)[mark].get_class (); + if (klass >= class_count) continue; + class_to_info[klass].marks.add (mark); + } + + for (const auto& link : mark_array.vertex->obj.real_links) + { + unsigned mark = (link.position - 2) / + OT::Layout::GPOS_impl::MarkRecord::static_size; + unsigned klass = (*mark_array.table)[mark].get_class (); + if (klass >= class_count) continue; + class_to_info[klass].child_indices.push (link.objidx); + } + + unsigned base_array_id = + c.graph.index_for_offset (this_index, &baseArray); + auto& base_array_v = c.graph.vertices_[base_array_id]; + + for (const auto& link : base_array_v.obj.real_links) + { + unsigned index = (link.position - 2) / OT::Offset16::static_size; + unsigned klass = index % class_count; + class_to_info[klass].child_indices.push (link.objidx); + } + + return class_to_info; + } + + bool shrink (split_context_t& sc, + unsigned this_index, + unsigned count) + { + DEBUG_MSG (SUBSET_REPACK, nullptr, + " Shrinking MarkBasePosFormat1 (%u) to [0, %u).", + this_index, + count); + + unsigned old_count = classCount; + if (count >= old_count) + return true; + + classCount = count; + + auto mark_coverage = sc.c.graph.as_mutable_table<Coverage> (this_index, + &markCoverage); + if (!mark_coverage) return false; + hb_set_t marks = sc.marks_for (0, count); + auto new_coverage = + + hb_enumerate (mark_coverage.table->iter ()) + | hb_filter (marks, hb_first) + | hb_map_retains_sorting (hb_second) + ; + if (!Coverage::make_coverage (sc.c, + new_coverage, + mark_coverage.index, + 4 + 2 * marks.get_population ())) + return false; + + + auto base_array = sc.c.graph.as_mutable_table<AnchorMatrix> (this_index, + &baseArray, + old_count); + if (!base_array || !base_array.table->shrink (sc.c, + base_array.index, + old_count, + count)) + return false; + + auto mark_array = sc.c.graph.as_mutable_table<MarkArray> (this_index, + &markArray); + if (!mark_array || !mark_array.table->shrink (sc.c, + sc.mark_array_links, + mark_array.index, + count)) + return false; + + return true; + } + + // Create a new MarkBasePos that has all of the data for classes from [start, end). + unsigned clone_range (split_context_t& sc, + unsigned this_index, + unsigned start, unsigned end) const + { + DEBUG_MSG (SUBSET_REPACK, nullptr, + " Cloning MarkBasePosFormat1 (%u) range [%u, %u).", this_index, start, end); + + graph_t& graph = sc.c.graph; + unsigned prime_size = OT::Layout::GPOS_impl::MarkBasePosFormat1_2<SmallTypes>::static_size; + + unsigned prime_id = sc.c.create_node (prime_size); + if (prime_id == (unsigned) -1) return -1; + + MarkBasePosFormat1* prime = (MarkBasePosFormat1*) graph.object (prime_id).head; + prime->format = this->format; + unsigned new_class_count = end - start; + prime->classCount = new_class_count; + + unsigned base_coverage_id = + graph.index_for_offset (sc.this_index, &baseCoverage); + graph.add_link (&(prime->baseCoverage), prime_id, base_coverage_id); + graph.duplicate (prime_id, base_coverage_id); + + auto mark_coverage = sc.c.graph.as_table<Coverage> (this_index, + &markCoverage); + if (!mark_coverage) return false; + hb_set_t marks = sc.marks_for (start, end); + auto new_coverage = + + hb_enumerate (mark_coverage.table->iter ()) + | hb_filter (marks, hb_first) + | hb_map_retains_sorting (hb_second) + ; + if (!Coverage::add_coverage (sc.c, + prime_id, + 2, + + new_coverage, + marks.get_population () * 2 + 4)) + return -1; + + auto mark_array = + graph.as_table <MarkArray> (sc.this_index, &markArray); + if (!mark_array) return -1; + unsigned new_mark_array = + mark_array.table->clone (sc.c, + mark_array.index, + sc.mark_array_links, + marks, + start); + graph.add_link (&(prime->markArray), prime_id, new_mark_array); + + unsigned class_count = classCount; + auto base_array = + graph.as_table<AnchorMatrix> (sc.this_index, &baseArray, class_count); + if (!base_array) return -1; + unsigned new_base_array = + base_array.table->clone (sc.c, + base_array.index, + start, end, this->classCount); + graph.add_link (&(prime->baseArray), prime_id, new_base_array); + + return prime_id; + } +}; + + +struct MarkBasePos : public OT::Layout::GPOS_impl::MarkBasePos +{ + hb_vector_t<unsigned> split_subtables (gsubgpos_graph_context_t& c, + unsigned parent_index, + unsigned this_index) + { + switch (u.format) { + case 1: + return ((MarkBasePosFormat1*)(&u.format1))->split_subtables (c, parent_index, this_index); +#ifndef HB_NO_BEYOND_64K + case 2: HB_FALLTHROUGH; + // Don't split 24bit MarkBasePos's. +#endif + default: + return hb_vector_t<unsigned> (); + } + } + + bool sanitize (graph_t::vertex_t& vertex) const + { + int64_t vertex_len = vertex.obj.tail - vertex.obj.head; + if (vertex_len < u.format.get_size ()) return false; + hb_barrier (); + + switch (u.format) { + case 1: + return ((MarkBasePosFormat1*)(&u.format1))->sanitize (vertex); +#ifndef HB_NO_BEYOND_64K + case 2: HB_FALLTHROUGH; +#endif + default: + // We don't handle format 3 and 4 here. + return false; + } + } +}; + + +} + +#endif // GRAPH_MARKBASEPOS_GRAPH_HH diff --git a/gfx/harfbuzz/src/graph/pairpos-graph.hh b/gfx/harfbuzz/src/graph/pairpos-graph.hh new file mode 100644 index 0000000000..f7f74b18c9 --- /dev/null +++ b/gfx/harfbuzz/src/graph/pairpos-graph.hh @@ -0,0 +1,650 @@ +/* + * 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 + */ + +#ifndef GRAPH_PAIRPOS_GRAPH_HH +#define GRAPH_PAIRPOS_GRAPH_HH + +#include "split-helpers.hh" +#include "coverage-graph.hh" +#include "classdef-graph.hh" +#include "../OT/Layout/GPOS/PairPos.hh" +#include "../OT/Layout/GPOS/PosLookupSubTable.hh" + +namespace graph { + +struct PairPosFormat1 : public OT::Layout::GPOS_impl::PairPosFormat1_3<SmallTypes> +{ + bool sanitize (graph_t::vertex_t& vertex) const + { + int64_t vertex_len = vertex.obj.tail - vertex.obj.head; + unsigned min_size = OT::Layout::GPOS_impl::PairPosFormat1_3<SmallTypes>::min_size; + if (vertex_len < min_size) return false; + hb_barrier (); + + return vertex_len >= + min_size + pairSet.get_size () - pairSet.len.get_size(); + } + + hb_vector_t<unsigned> split_subtables (gsubgpos_graph_context_t& c, + unsigned parent_index, + unsigned this_index) + { + hb_set_t visited; + + const unsigned coverage_id = c.graph.index_for_offset (this_index, &coverage); + const unsigned coverage_size = c.graph.vertices_[coverage_id].table_size (); + const unsigned base_size = OT::Layout::GPOS_impl::PairPosFormat1_3<SmallTypes>::min_size; + + unsigned partial_coverage_size = 4; + unsigned accumulated = base_size; + hb_vector_t<unsigned> split_points; + for (unsigned i = 0; i < pairSet.len; i++) + { + unsigned pair_set_index = pair_set_graph_index (c, this_index, i); + unsigned accumulated_delta = + c.graph.find_subgraph_size (pair_set_index, visited) + + SmallTypes::size; // for PairSet offset. + partial_coverage_size += OT::HBUINT16::static_size; + + accumulated += accumulated_delta; + unsigned total = accumulated + hb_min (partial_coverage_size, coverage_size); + + if (total >= (1 << 16)) + { + split_points.push (i); + accumulated = base_size + accumulated_delta; + partial_coverage_size = 6; + visited.clear (); // node sharing isn't allowed between splits. + } + } + + split_context_t split_context { + c, + this, + c.graph.duplicate_if_shared (parent_index, this_index), + }; + + return actuate_subtable_split<split_context_t> (split_context, split_points); + } + + private: + + struct split_context_t { + gsubgpos_graph_context_t& c; + PairPosFormat1* thiz; + unsigned this_index; + + unsigned original_count () + { + return thiz->pairSet.len; + } + + unsigned clone_range (unsigned start, unsigned end) + { + return thiz->clone_range (this->c, this->this_index, start, end); + } + + bool shrink (unsigned count) + { + return thiz->shrink (this->c, this->this_index, count); + } + }; + + bool shrink (gsubgpos_graph_context_t& c, + unsigned this_index, + unsigned count) + { + DEBUG_MSG (SUBSET_REPACK, nullptr, + " Shrinking PairPosFormat1 (%u) to [0, %u).", + this_index, + count); + unsigned old_count = pairSet.len; + if (count >= old_count) + return true; + + pairSet.len = count; + c.graph.vertices_[this_index].obj.tail -= (old_count - count) * SmallTypes::size; + + auto coverage = c.graph.as_mutable_table<Coverage> (this_index, &this->coverage); + if (!coverage) return false; + + unsigned coverage_size = coverage.vertex->table_size (); + auto new_coverage = + + hb_zip (coverage.table->iter (), hb_range ()) + | hb_filter ([&] (hb_pair_t<unsigned, unsigned> p) { + return p.second < count; + }) + | hb_map_retains_sorting (hb_first) + ; + + return Coverage::make_coverage (c, new_coverage, coverage.index, coverage_size); + } + + // Create a new PairPos including PairSet's from start (inclusive) to end (exclusive). + // Returns object id of the new object. + unsigned clone_range (gsubgpos_graph_context_t& c, + unsigned this_index, + unsigned start, unsigned end) const + { + DEBUG_MSG (SUBSET_REPACK, nullptr, + " Cloning PairPosFormat1 (%u) range [%u, %u).", this_index, start, end); + + unsigned num_pair_sets = end - start; + unsigned prime_size = OT::Layout::GPOS_impl::PairPosFormat1_3<SmallTypes>::min_size + + num_pair_sets * SmallTypes::size; + + unsigned pair_pos_prime_id = c.create_node (prime_size); + if (pair_pos_prime_id == (unsigned) -1) return -1; + + PairPosFormat1* pair_pos_prime = (PairPosFormat1*) c.graph.object (pair_pos_prime_id).head; + pair_pos_prime->format = this->format; + pair_pos_prime->valueFormat[0] = this->valueFormat[0]; + pair_pos_prime->valueFormat[1] = this->valueFormat[1]; + pair_pos_prime->pairSet.len = num_pair_sets; + + for (unsigned i = start; i < end; i++) + { + c.graph.move_child<> (this_index, + &pairSet[i], + pair_pos_prime_id, + &pair_pos_prime->pairSet[i - start]); + } + + unsigned coverage_id = c.graph.index_for_offset (this_index, &coverage); + if (!Coverage::clone_coverage (c, + coverage_id, + pair_pos_prime_id, + 2, + start, end)) + return -1; + + return pair_pos_prime_id; + } + + + + unsigned pair_set_graph_index (gsubgpos_graph_context_t& c, unsigned this_index, unsigned i) const + { + return c.graph.index_for_offset (this_index, &pairSet[i]); + } +}; + +struct PairPosFormat2 : public OT::Layout::GPOS_impl::PairPosFormat2_4<SmallTypes> +{ + bool sanitize (graph_t::vertex_t& vertex) const + { + size_t vertex_len = vertex.table_size (); + unsigned min_size = OT::Layout::GPOS_impl::PairPosFormat2_4<SmallTypes>::min_size; + if (vertex_len < min_size) return false; + hb_barrier (); + + const unsigned class1_count = class1Count; + return vertex_len >= + min_size + class1_count * get_class1_record_size (); + } + + hb_vector_t<unsigned> split_subtables (gsubgpos_graph_context_t& c, + unsigned parent_index, + unsigned this_index) + { + const unsigned base_size = OT::Layout::GPOS_impl::PairPosFormat2_4<SmallTypes>::min_size; + const unsigned class_def_2_size = size_of (c, this_index, &classDef2); + const Coverage* coverage = get_coverage (c, this_index); + const ClassDef* class_def_1 = get_class_def_1 (c, this_index); + auto gid_and_class = + + coverage->iter () + | hb_map_retains_sorting ([&] (hb_codepoint_t gid) { + return hb_codepoint_pair_t (gid, class_def_1->get_class (gid)); + }) + ; + class_def_size_estimator_t estimator (gid_and_class); + + const unsigned class1_count = class1Count; + const unsigned class2_count = class2Count; + const unsigned class1_record_size = get_class1_record_size (); + + const unsigned value_1_len = valueFormat1.get_len (); + const unsigned value_2_len = valueFormat2.get_len (); + const unsigned total_value_len = value_1_len + value_2_len; + + unsigned accumulated = base_size; + unsigned coverage_size = 4; + unsigned class_def_1_size = 4; + unsigned max_coverage_size = coverage_size; + unsigned max_class_def_1_size = class_def_1_size; + + hb_vector_t<unsigned> split_points; + + hb_hashmap_t<unsigned, unsigned> device_tables = get_all_device_tables (c, this_index); + hb_vector_t<unsigned> format1_device_table_indices = valueFormat1.get_device_table_indices (); + hb_vector_t<unsigned> format2_device_table_indices = valueFormat2.get_device_table_indices (); + bool has_device_tables = bool(format1_device_table_indices) || bool(format2_device_table_indices); + + hb_set_t visited; + for (unsigned i = 0; i < class1_count; i++) + { + unsigned accumulated_delta = class1_record_size; + coverage_size += estimator.incremental_coverage_size (i); + class_def_1_size += estimator.incremental_class_def_size (i); + max_coverage_size = hb_max (max_coverage_size, coverage_size); + max_class_def_1_size = hb_max (max_class_def_1_size, class_def_1_size); + + if (has_device_tables) { + for (unsigned j = 0; j < class2_count; j++) + { + unsigned value1_index = total_value_len * (class2_count * i + j); + unsigned value2_index = value1_index + value_1_len; + accumulated_delta += size_of_value_record_children (c, + device_tables, + format1_device_table_indices, + value1_index, + visited); + accumulated_delta += size_of_value_record_children (c, + device_tables, + format2_device_table_indices, + value2_index, + visited); + } + } + + accumulated += accumulated_delta; + unsigned total = accumulated + + coverage_size + class_def_1_size + class_def_2_size + // The largest object will pack last and can exceed the size limit. + - hb_max (hb_max (coverage_size, class_def_1_size), class_def_2_size); + if (total >= (1 << 16)) + { + split_points.push (i); + // split does not include i, so add the size for i when we reset the size counters. + accumulated = base_size + accumulated_delta; + coverage_size = 4 + estimator.incremental_coverage_size (i); + class_def_1_size = 4 + estimator.incremental_class_def_size (i); + visited.clear (); // node sharing isn't allowed between splits. + } + } + + split_context_t split_context { + c, + this, + c.graph.duplicate_if_shared (parent_index, this_index), + class1_record_size, + total_value_len, + value_1_len, + value_2_len, + max_coverage_size, + max_class_def_1_size, + device_tables, + format1_device_table_indices, + format2_device_table_indices + }; + + return actuate_subtable_split<split_context_t> (split_context, split_points); + } + private: + + struct split_context_t + { + gsubgpos_graph_context_t& c; + PairPosFormat2* thiz; + unsigned this_index; + unsigned class1_record_size; + unsigned value_record_len; + unsigned value1_record_len; + unsigned value2_record_len; + unsigned max_coverage_size; + unsigned max_class_def_size; + + const hb_hashmap_t<unsigned, unsigned>& device_tables; + const hb_vector_t<unsigned>& format1_device_table_indices; + const hb_vector_t<unsigned>& format2_device_table_indices; + + unsigned original_count () + { + return thiz->class1Count; + } + + unsigned clone_range (unsigned start, unsigned end) + { + return thiz->clone_range (*this, start, end); + } + + bool shrink (unsigned count) + { + return thiz->shrink (*this, count); + } + }; + + size_t get_class1_record_size () const + { + const size_t class2_count = class2Count; + return + class2_count * (valueFormat1.get_size () + valueFormat2.get_size ()); + } + + unsigned clone_range (split_context_t& split_context, + unsigned start, unsigned end) const + { + DEBUG_MSG (SUBSET_REPACK, nullptr, + " Cloning PairPosFormat2 (%u) range [%u, %u).", split_context.this_index, start, end); + + graph_t& graph = split_context.c.graph; + + unsigned num_records = end - start; + unsigned prime_size = OT::Layout::GPOS_impl::PairPosFormat2_4<SmallTypes>::min_size + + num_records * split_context.class1_record_size; + + unsigned pair_pos_prime_id = split_context.c.create_node (prime_size); + if (pair_pos_prime_id == (unsigned) -1) return -1; + + PairPosFormat2* pair_pos_prime = + (PairPosFormat2*) graph.object (pair_pos_prime_id).head; + pair_pos_prime->format = this->format; + pair_pos_prime->valueFormat1 = this->valueFormat1; + pair_pos_prime->valueFormat2 = this->valueFormat2; + pair_pos_prime->class1Count = num_records; + pair_pos_prime->class2Count = this->class2Count; + clone_class1_records (split_context, + pair_pos_prime_id, + start, + end); + + unsigned coverage_id = + graph.index_for_offset (split_context.this_index, &coverage); + unsigned class_def_1_id = + graph.index_for_offset (split_context.this_index, &classDef1); + auto& coverage_v = graph.vertices_[coverage_id]; + auto& class_def_1_v = graph.vertices_[class_def_1_id]; + Coverage* coverage_table = (Coverage*) coverage_v.obj.head; + ClassDef* class_def_1_table = (ClassDef*) class_def_1_v.obj.head; + if (!coverage_table + || !coverage_table->sanitize (coverage_v) + || !class_def_1_table + || !class_def_1_table->sanitize (class_def_1_v)) + return -1; + + auto klass_map = + + coverage_table->iter () + | hb_map_retains_sorting ([&] (hb_codepoint_t gid) { + return hb_codepoint_pair_t (gid, class_def_1_table->get_class (gid)); + }) + | hb_filter ([&] (hb_codepoint_t klass) { + return klass >= start && klass < end; + }, hb_second) + | hb_map_retains_sorting ([&] (hb_codepoint_pair_t gid_and_class) { + // Classes must be from 0...N so subtract start + return hb_codepoint_pair_t (gid_and_class.first, gid_and_class.second - start); + }) + ; + + if (!Coverage::add_coverage (split_context.c, + pair_pos_prime_id, + 2, + + klass_map | hb_map_retains_sorting (hb_first), + split_context.max_coverage_size)) + return -1; + + // classDef1 + if (!ClassDef::add_class_def (split_context.c, + pair_pos_prime_id, + 8, + + klass_map, + split_context.max_class_def_size)) + return -1; + + // classDef2 + unsigned class_def_2_id = + graph.index_for_offset (split_context.this_index, &classDef2); + auto* class_def_link = graph.vertices_[pair_pos_prime_id].obj.real_links.push (); + class_def_link->width = SmallTypes::size; + class_def_link->objidx = class_def_2_id; + class_def_link->position = 10; + graph.vertices_[class_def_2_id].add_parent (pair_pos_prime_id); + graph.duplicate (pair_pos_prime_id, class_def_2_id); + + return pair_pos_prime_id; + } + + void clone_class1_records (split_context_t& split_context, + unsigned pair_pos_prime_id, + unsigned start, unsigned end) const + { + PairPosFormat2* pair_pos_prime = + (PairPosFormat2*) split_context.c.graph.object (pair_pos_prime_id).head; + + char* start_addr = ((char*)&values[0]) + start * split_context.class1_record_size; + unsigned num_records = end - start; + hb_memcpy (&pair_pos_prime->values[0], + start_addr, + num_records * split_context.class1_record_size); + + if (!split_context.format1_device_table_indices + && !split_context.format2_device_table_indices) + // No device tables to move over. + return; + + unsigned class2_count = class2Count; + for (unsigned i = start; i < end; i++) + { + for (unsigned j = 0; j < class2_count; j++) + { + unsigned value1_index = split_context.value_record_len * (class2_count * i + j); + unsigned value2_index = value1_index + split_context.value1_record_len; + + unsigned new_value1_index = split_context.value_record_len * (class2_count * (i - start) + j); + unsigned new_value2_index = new_value1_index + split_context.value1_record_len; + + transfer_device_tables (split_context, + pair_pos_prime_id, + split_context.format1_device_table_indices, + value1_index, + new_value1_index); + + transfer_device_tables (split_context, + pair_pos_prime_id, + split_context.format2_device_table_indices, + value2_index, + new_value2_index); + } + } + } + + void transfer_device_tables (split_context_t& split_context, + unsigned pair_pos_prime_id, + const hb_vector_t<unsigned>& device_table_indices, + unsigned old_value_record_index, + unsigned new_value_record_index) const + { + PairPosFormat2* pair_pos_prime = + (PairPosFormat2*) split_context.c.graph.object (pair_pos_prime_id).head; + + for (unsigned i : device_table_indices) + { + OT::Offset16* record = (OT::Offset16*) &values[old_value_record_index + i]; + unsigned record_position = ((char*) record) - ((char*) this); + if (!split_context.device_tables.has (record_position)) continue; + + split_context.c.graph.move_child ( + split_context.this_index, + record, + pair_pos_prime_id, + (OT::Offset16*) &pair_pos_prime->values[new_value_record_index + i]); + } + } + + bool shrink (split_context_t& split_context, + unsigned count) + { + DEBUG_MSG (SUBSET_REPACK, nullptr, + " Shrinking PairPosFormat2 (%u) to [0, %u).", + split_context.this_index, + count); + unsigned old_count = class1Count; + if (count >= old_count) + return true; + + graph_t& graph = split_context.c.graph; + class1Count = count; + graph.vertices_[split_context.this_index].obj.tail -= + (old_count - count) * split_context.class1_record_size; + + auto coverage = + graph.as_mutable_table<Coverage> (split_context.this_index, &this->coverage); + if (!coverage) return false; + + auto class_def_1 = + graph.as_mutable_table<ClassDef> (split_context.this_index, &classDef1); + if (!class_def_1) return false; + + auto klass_map = + + coverage.table->iter () + | hb_map_retains_sorting ([&] (hb_codepoint_t gid) { + return hb_codepoint_pair_t (gid, class_def_1.table->get_class (gid)); + }) + | hb_filter ([&] (hb_codepoint_t klass) { + return klass < count; + }, hb_second) + ; + + auto new_coverage = + klass_map | hb_map_retains_sorting (hb_first); + if (!Coverage::make_coverage (split_context.c, + + new_coverage, + coverage.index, + // existing ranges my not be kept, worst case size is a format 1 + // coverage table. + 4 + new_coverage.len() * 2)) + return false; + + return ClassDef::make_class_def (split_context.c, + + klass_map, + class_def_1.index, + class_def_1.vertex->table_size ()); + } + + hb_hashmap_t<unsigned, unsigned> + get_all_device_tables (gsubgpos_graph_context_t& c, + unsigned this_index) const + { + const auto& v = c.graph.vertices_[this_index]; + return v.position_to_index_map (); + } + + const Coverage* get_coverage (gsubgpos_graph_context_t& c, + unsigned this_index) const + { + unsigned coverage_id = c.graph.index_for_offset (this_index, &coverage); + 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 &Null(Coverage); + return coverage_table; + } + + const ClassDef* get_class_def_1 (gsubgpos_graph_context_t& c, + unsigned this_index) const + { + unsigned class_def_1_id = c.graph.index_for_offset (this_index, &classDef1); + auto& class_def_1_v = c.graph.vertices_[class_def_1_id]; + + ClassDef* class_def_1_table = (ClassDef*) class_def_1_v.obj.head; + if (!class_def_1_table || !class_def_1_table->sanitize (class_def_1_v)) + return &Null(ClassDef); + return class_def_1_table; + } + + unsigned size_of_value_record_children (gsubgpos_graph_context_t& c, + const hb_hashmap_t<unsigned, unsigned>& device_tables, + const hb_vector_t<unsigned> device_table_indices, + unsigned value_record_index, + hb_set_t& visited) + { + unsigned size = 0; + for (unsigned i : device_table_indices) + { + OT::Layout::GPOS_impl::Value* record = &values[value_record_index + i]; + unsigned record_position = ((char*) record) - ((char*) this); + unsigned* obj_idx; + if (!device_tables.has (record_position, &obj_idx)) continue; + size += c.graph.find_subgraph_size (*obj_idx, visited); + } + return size; + } + + unsigned size_of (gsubgpos_graph_context_t& c, + unsigned this_index, + const void* offset) const + { + const unsigned id = c.graph.index_for_offset (this_index, offset); + return c.graph.vertices_[id].table_size (); + } +}; + +struct PairPos : public OT::Layout::GPOS_impl::PairPos +{ + hb_vector_t<unsigned> split_subtables (gsubgpos_graph_context_t& c, + unsigned parent_index, + unsigned this_index) + { + switch (u.format) { + case 1: + return ((PairPosFormat1*)(&u.format1))->split_subtables (c, parent_index, this_index); + case 2: + return ((PairPosFormat2*)(&u.format2))->split_subtables (c, parent_index, this_index); +#ifndef HB_NO_BEYOND_64K + case 3: HB_FALLTHROUGH; + case 4: HB_FALLTHROUGH; + // Don't split 24bit PairPos's. +#endif + default: + return hb_vector_t<unsigned> (); + } + } + + bool sanitize (graph_t::vertex_t& vertex) const + { + int64_t vertex_len = vertex.obj.tail - vertex.obj.head; + if (vertex_len < u.format.get_size ()) return false; + hb_barrier (); + + switch (u.format) { + case 1: + return ((PairPosFormat1*)(&u.format1))->sanitize (vertex); + case 2: + return ((PairPosFormat2*)(&u.format2))->sanitize (vertex); +#ifndef HB_NO_BEYOND_64K + case 3: HB_FALLTHROUGH; + case 4: HB_FALLTHROUGH; +#endif + default: + // We don't handle format 3 and 4 here. + return false; + } + } +}; + +} + +#endif // GRAPH_PAIRPOS_GRAPH_HH diff --git a/gfx/harfbuzz/src/graph/serialize.hh b/gfx/harfbuzz/src/graph/serialize.hh new file mode 100644 index 0000000000..06e4bf44d8 --- /dev/null +++ b/gfx/harfbuzz/src/graph/serialize.hh @@ -0,0 +1,273 @@ +/* + * 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 + */ + +#ifndef GRAPH_SERIALIZE_HH +#define GRAPH_SERIALIZE_HH + +namespace graph { + +struct overflow_record_t +{ + unsigned parent; + unsigned child; + + bool operator != (const overflow_record_t o) const + { return !(*this == o); } + + inline bool operator == (const overflow_record_t& o) const + { + return parent == o.parent && + child == o.child; + } + + inline uint32_t hash () const + { + uint32_t current = 0; + current = current * 31 + hb_hash (parent); + current = current * 31 + hb_hash (child); + return current; + } +}; + +inline +int64_t compute_offset ( + const graph_t& graph, + unsigned parent_idx, + const hb_serialize_context_t::object_t::link_t& link) +{ + const auto& parent = graph.vertices_[parent_idx]; + const auto& child = graph.vertices_[link.objidx]; + int64_t offset = 0; + switch ((hb_serialize_context_t::whence_t) link.whence) { + case hb_serialize_context_t::whence_t::Head: + offset = child.start - parent.start; break; + case hb_serialize_context_t::whence_t::Tail: + offset = child.start - parent.end; break; + case hb_serialize_context_t::whence_t::Absolute: + offset = child.start; break; + } + + assert (offset >= link.bias); + offset -= link.bias; + return offset; +} + +inline +bool is_valid_offset (int64_t offset, + const hb_serialize_context_t::object_t::link_t& link) +{ + if (unlikely (!link.width)) + // Virtual links can't overflow. + return link.is_signed || offset >= 0; + + if (link.is_signed) + { + if (link.width == 4) + return offset >= -((int64_t) 1 << 31) && offset < ((int64_t) 1 << 31); + else + return offset >= -(1 << 15) && offset < (1 << 15); + } + else + { + if (link.width == 4) + return offset >= 0 && offset < ((int64_t) 1 << 32); + else if (link.width == 3) + return offset >= 0 && offset < ((int32_t) 1 << 24); + else + return offset >= 0 && offset < (1 << 16); + } +} + +/* + * Will any offsets overflow on graph when it's serialized? + */ +inline bool +will_overflow (graph_t& graph, + hb_vector_t<overflow_record_t>* overflows = nullptr) +{ + if (overflows) overflows->resize (0); + graph.update_positions (); + + hb_hashmap_t<overflow_record_t*, bool> record_set; + const auto& vertices = graph.vertices_; + for (int parent_idx = vertices.length - 1; parent_idx >= 0; parent_idx--) + { + // Don't need to check virtual links for overflow + for (const auto& link : vertices.arrayZ[parent_idx].obj.real_links) + { + int64_t offset = compute_offset (graph, parent_idx, link); + if (likely (is_valid_offset (offset, link))) + continue; + + if (!overflows) return true; + + overflow_record_t r; + r.parent = parent_idx; + r.child = link.objidx; + if (record_set.has(&r)) continue; // don't keep duplicate overflows. + + overflows->push (r); + record_set.set(&r, true); + } + } + + if (!overflows) return false; + return overflows->length; +} + +inline +void print_overflows (graph_t& graph, + const hb_vector_t<overflow_record_t>& overflows) +{ + if (!DEBUG_ENABLED(SUBSET_REPACK)) return; + + graph.update_parents (); + int limit = 10; + for (const auto& o : overflows) + { + if (!limit--) break; + const auto& parent = graph.vertices_[o.parent]; + const auto& child = graph.vertices_[o.child]; + DEBUG_MSG (SUBSET_REPACK, nullptr, + " overflow from " + "%4u (%4u in, %4u out, space %2u) => " + "%4u (%4u in, %4u out, space %2u)", + o.parent, + parent.incoming_edges (), + parent.obj.real_links.length + parent.obj.virtual_links.length, + graph.space_for (o.parent), + o.child, + child.incoming_edges (), + child.obj.real_links.length + child.obj.virtual_links.length, + graph.space_for (o.child)); + } + if (overflows.length > 10) { + DEBUG_MSG (SUBSET_REPACK, nullptr, " ... plus %u more overflows.", overflows.length - 10); + } +} + +template <typename O> inline void +serialize_link_of_type (const hb_serialize_context_t::object_t::link_t& link, + char* head, + hb_serialize_context_t* c) +{ + OT::Offset<O>* offset = reinterpret_cast<OT::Offset<O>*> (head + link.position); + *offset = 0; + c->add_link (*offset, + // serializer has an extra nil object at the start of the + // object array. So all id's are +1 of what our id's are. + link.objidx + 1, + (hb_serialize_context_t::whence_t) link.whence, + link.bias); +} + +inline +void serialize_link (const hb_serialize_context_t::object_t::link_t& link, + char* head, + hb_serialize_context_t* c) +{ + switch (link.width) + { + case 0: + // Virtual links aren't serialized. + return; + case 4: + if (link.is_signed) + { + serialize_link_of_type<OT::HBINT32> (link, head, c); + } else { + serialize_link_of_type<OT::HBUINT32> (link, head, c); + } + return; + case 2: + if (link.is_signed) + { + serialize_link_of_type<OT::HBINT16> (link, head, c); + } else { + serialize_link_of_type<OT::HBUINT16> (link, head, c); + } + return; + case 3: + serialize_link_of_type<OT::HBUINT24> (link, head, c); + return; + default: + // Unexpected link width. + assert (0); + } +} + +/* + * serialize graph into the provided serialization buffer. + */ +inline hb_blob_t* serialize (const graph_t& graph) +{ + hb_vector_t<char> buffer; + size_t size = graph.total_size_in_bytes (); + + if (!size) return hb_blob_get_empty (); + + if (!buffer.alloc (size)) { + DEBUG_MSG (SUBSET_REPACK, nullptr, "Unable to allocate output buffer."); + return nullptr; + } + hb_serialize_context_t c((void *) buffer, size); + + c.start_serialize<void> (); + const auto& vertices = graph.vertices_; + for (unsigned i = 0; i < vertices.length; i++) { + c.push (); + + size_t size = vertices[i].obj.tail - vertices[i].obj.head; + char* start = c.allocate_size <char> (size); + if (!start) { + DEBUG_MSG (SUBSET_REPACK, nullptr, "Buffer out of space."); + return nullptr; + } + + hb_memcpy (start, vertices[i].obj.head, size); + + // Only real links needs to be serialized. + for (const auto& link : vertices[i].obj.real_links) + serialize_link (link, start, &c); + + // All duplications are already encoded in the graph, so don't + // enable sharing during packing. + c.pop_pack (false); + } + c.end_serialize (); + + if (c.in_error ()) { + DEBUG_MSG (SUBSET_REPACK, nullptr, "Error during serialization. Err flag: %d", + c.errors); + return nullptr; + } + + return c.copy_blob (); +} + +} // namespace graph + +#endif // GRAPH_SERIALIZE_HH diff --git a/gfx/harfbuzz/src/graph/split-helpers.hh b/gfx/harfbuzz/src/graph/split-helpers.hh new file mode 100644 index 0000000000..61fd7c2d2f --- /dev/null +++ b/gfx/harfbuzz/src/graph/split-helpers.hh @@ -0,0 +1,69 @@ +/* + * 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 + */ + +#ifndef GRAPH_SPLIT_HELPERS_HH +#define GRAPH_SPLIT_HELPERS_HH + +namespace graph { + +template<typename Context> +HB_INTERNAL +hb_vector_t<unsigned> actuate_subtable_split (Context& split_context, + const hb_vector_t<unsigned>& split_points) +{ + hb_vector_t<unsigned> new_objects; + if (!split_points) + return new_objects; + + for (unsigned i = 0; i < split_points.length; i++) + { + unsigned start = split_points[i]; + unsigned end = (i < split_points.length - 1) + ? split_points[i + 1] + : split_context.original_count (); + unsigned id = split_context.clone_range (start, end); + + if (id == (unsigned) -1) + { + new_objects.reset (); + new_objects.allocated = -1; // mark error + return new_objects; + } + new_objects.push (id); + } + + if (!split_context.shrink (split_points[0])) + { + new_objects.reset (); + new_objects.allocated = -1; // mark error + } + + return new_objects; +} + +} + +#endif // GRAPH_SPLIT_HELPERS_HH diff --git a/gfx/harfbuzz/src/graph/test-classdef-graph.cc b/gfx/harfbuzz/src/graph/test-classdef-graph.cc new file mode 100644 index 0000000000..266be5e2d4 --- /dev/null +++ b/gfx/harfbuzz/src/graph/test-classdef-graph.cc @@ -0,0 +1,119 @@ +/* + * 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-context.hh" +#include "classdef-graph.hh" + +typedef hb_codepoint_pair_t gid_and_class_t; +typedef hb_vector_t<gid_and_class_t> gid_and_class_list_t; + + +static bool incremental_size_is (const gid_and_class_list_t& list, unsigned klass, + unsigned cov_expected, unsigned class_def_expected) +{ + graph::class_def_size_estimator_t estimator (list.iter ()); + + unsigned result = estimator.incremental_coverage_size (klass); + if (result != cov_expected) + { + printf ("FAIL: coverage expected size %u but was %u\n", cov_expected, result); + return false; + } + + result = estimator.incremental_class_def_size (klass); + if (result != class_def_expected) + { + printf ("FAIL: class def expected size %u but was %u\n", class_def_expected, result); + return false; + } + + return true; +} + +static void test_class_and_coverage_size_estimates () +{ + gid_and_class_list_t empty = { + }; + assert (incremental_size_is (empty, 0, 0, 0)); + assert (incremental_size_is (empty, 1, 0, 0)); + + gid_and_class_list_t class_zero = { + {5, 0}, + }; + assert (incremental_size_is (class_zero, 0, 2, 0)); + + gid_and_class_list_t consecutive = { + {4, 0}, + {5, 0}, + {6, 1}, + {7, 1}, + {8, 2}, + {9, 2}, + {10, 2}, + {11, 2}, + }; + assert (incremental_size_is (consecutive, 0, 4, 0)); + assert (incremental_size_is (consecutive, 1, 4, 4)); + assert (incremental_size_is (consecutive, 2, 8, 6)); + + gid_and_class_list_t non_consecutive = { + {4, 0}, + {5, 0}, + + {6, 1}, + {7, 1}, + + {9, 2}, + {10, 2}, + {11, 2}, + {12, 2}, + }; + assert (incremental_size_is (non_consecutive, 0, 4, 0)); + assert (incremental_size_is (non_consecutive, 1, 4, 6)); + assert (incremental_size_is (non_consecutive, 2, 8, 6)); + + gid_and_class_list_t multiple_ranges = { + {4, 0}, + {5, 0}, + + {6, 1}, + {7, 1}, + + {9, 1}, + + {11, 1}, + {12, 1}, + {13, 1}, + }; + assert (incremental_size_is (multiple_ranges, 0, 4, 0)); + assert (incremental_size_is (multiple_ranges, 1, 2 * 6, 3 * 6)); +} + +int +main (int argc, char **argv) +{ + test_class_and_coverage_size_estimates (); +} |