src/hb-subset-plan.hh - third_party/harfbuzz - Git at Google

 /*
  * Copyright © 2018  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, Roderick Sheeter
  */

 #ifndef HB_SUBSET_PLAN_HH
 #define HB_SUBSET_PLAN_HH

 #include "hb.hh"

 #include "hb-subset.h"
 #include "hb-subset-input.hh"
 #include "hb-subset-accelerator.hh"

 #include "hb-map.hh"
 #include "hb-bimap.hh"
 #include "hb-set.hh"

 namespace OT {
 struct Feature;
 }

 struct head_maxp_info_t
 {
   head_maxp_info_t ()
       :xMin (0x7FFF), xMax (-0x7FFF), yMin (0x7FFF), yMax (-0x7FFF),
       maxPoints (0), maxContours (0),
       maxCompositePoints (0),
       maxCompositeContours (0),
       maxComponentElements (0),
       maxComponentDepth (0),
       allXMinIsLsb (true) {}

   int xMin;
   int xMax;
   int yMin;
   int yMax;
   unsigned maxPoints;
   unsigned maxContours;
   unsigned maxCompositePoints;
   unsigned maxCompositeContours;
   unsigned maxComponentElements;
   unsigned maxComponentDepth;
   bool allXMinIsLsb;
 };

 typedef struct head_maxp_info_t head_maxp_info_t;

 namespace OT {
   struct cff1_subset_accelerator_t;
   struct cff2_subset_accelerator_t;
 }

 struct hb_subset_plan_t
 {
   HB_INTERNAL hb_subset_plan_t (hb_face_t *,
 				const hb_subset_input_t *input);

   HB_INTERNAL ~hb_subset_plan_t();

   hb_object_header_t header;

   bool successful;
   unsigned flags;
   bool attach_accelerator_data = false;
   bool force_long_loca = false;

   // The glyph subset
   hb_map_t *codepoint_to_glyph; // Needs to be heap-allocated

   // Old -> New glyph id mapping
   hb_map_t *glyph_map; // Needs to be heap-allocated
   hb_map_t *reverse_glyph_map; // Needs to be heap-allocated

   // Plan is only good for a specific source/dest so keep them with it
   hb_face_t *source;
 #ifndef HB_NO_SUBSET_CFF
   // These have to be immediately after source:
   hb_face_lazy_loader_t<OT::cff1_subset_accelerator_t, 1> cff1_accel;
   hb_face_lazy_loader_t<OT::cff2_subset_accelerator_t, 2> cff2_accel;
 #endif

   hb_face_t *dest;

   unsigned int _num_output_glyphs;

   bool all_axes_pinned;
   bool pinned_at_default;
   bool has_seac;

   // whether to insert a catch-all FeatureVariationRecord
   bool gsub_insert_catch_all_feature_variation_rec;
   bool gpos_insert_catch_all_feature_variation_rec;

 #define HB_SUBSET_PLAN_MEMBER(Type, Name) Type Name;
 #include "hb-subset-plan-member-list.hh"
 #undef HB_SUBSET_PLAN_MEMBER

   //recalculated head/maxp table info after instancing
   mutable head_maxp_info_t head_maxp_info;

   const hb_subset_accelerator_t* accelerator;
   hb_subset_accelerator_t* inprogress_accelerator;

  public:

   template<typename T>
   struct source_table_loader
   {
     hb_blob_ptr_t<T> operator () (hb_subset_plan_t *plan)
     {
       hb_lock_t lock (plan->accelerator ? &plan->accelerator->sanitized_table_cache_lock : nullptr);

       auto *cache = plan->accelerator ? &plan->accelerator->sanitized_table_cache : &plan->sanitized_table_cache;
       if (cache
 	  && !cache->in_error ()
 	  && cache->has (+T::tableTag)) {
 	return hb_blob_reference (cache->get (+T::tableTag).get ());
       }

       hb::unique_ptr<hb_blob_t> table_blob {hb_sanitize_context_t ().reference_table<T> (plan->source)};
       hb_blob_t* ret = hb_blob_reference (table_blob.get ());

       if (likely (cache))
 	cache->set (+T::tableTag, std::move (table_blob));

       return ret;
     }
   };

   template<typename T>
   auto source_table() HB_AUTO_RETURN (source_table_loader<T> {} (this))

   bool in_error () const { return !successful; }

   bool check_success(bool success)
   {
     successful = (successful && success);
     return successful;
   }

   /*
    * The set of input glyph ids which will be retained in the subset.
    * Does NOT include ids kept due to retain_gids. You probably want to use
    * glyph_map/reverse_glyph_map.
    */
   inline const hb_set_t *
   glyphset () const
   {
     return &_glyphset;
   }

   /*
    * The set of input glyph ids which will be retained in the subset.
    */
   inline const hb_set_t *
   glyphset_gsub () const
   {
     return &_glyphset_gsub;
   }

   /*
    * The total number of output glyphs in the final subset.
    */
   inline unsigned int
   num_output_glyphs () const
   {
     return _num_output_glyphs;
   }

   inline bool new_gid_for_codepoint (hb_codepoint_t codepoint,
 				     hb_codepoint_t *new_gid) const
   {
     hb_codepoint_t old_gid = codepoint_to_glyph->get (codepoint);
     if (old_gid == HB_MAP_VALUE_INVALID)
       return false;

     return new_gid_for_old_gid (old_gid, new_gid);
   }

   inline bool new_gid_for_old_gid (hb_codepoint_t old_gid,
 				   hb_codepoint_t *new_gid) const
   {
     hb_codepoint_t gid = glyph_map->get (old_gid);
     if (gid == HB_MAP_VALUE_INVALID)
       return false;

     *new_gid = gid;
     return true;
   }

   inline bool old_gid_for_new_gid (hb_codepoint_t  new_gid,
 				   hb_codepoint_t *old_gid) const
   {
     hb_codepoint_t gid = reverse_glyph_map->get (new_gid);
     if (gid == HB_MAP_VALUE_INVALID)
       return false;

     *old_gid = gid;
     return true;
   }

   inline bool
   add_table (hb_tag_t tag,
 	     hb_blob_t *contents)
   {
     if (HB_DEBUG_SUBSET)
     {
       hb_blob_t *source_blob = source->reference_table (tag);
       DEBUG_MSG(SUBSET, nullptr, "add table %c%c%c%c, dest %u bytes, source %u bytes",
 		HB_UNTAG(tag),
 		hb_blob_get_length (contents),
 		hb_blob_get_length (source_blob));
       hb_blob_destroy (source_blob);
     }
     return hb_face_builder_add_table (dest, tag, contents);
   }
 };


 #endif /* HB_SUBSET_PLAN_HH */
	/*
	* Copyright © 2018 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, Roderick Sheeter
	*/

	#ifndef HB_SUBSET_PLAN_HH
	#define HB_SUBSET_PLAN_HH

	#include "hb.hh"

	#include "hb-subset.h"
	#include "hb-subset-input.hh"
	#include "hb-subset-accelerator.hh"

	#include "hb-map.hh"
	#include "hb-bimap.hh"
	#include "hb-set.hh"

	namespace OT {
	struct Feature;
	}

	struct head_maxp_info_t
	{
	head_maxp_info_t ()
	:xMin (0x7FFF), xMax (-0x7FFF), yMin (0x7FFF), yMax (-0x7FFF),
	maxPoints (0), maxContours (0),
	maxCompositePoints (0),
	maxCompositeContours (0),
	maxComponentElements (0),
	maxComponentDepth (0),
	allXMinIsLsb (true) {}

	int xMin;
	int xMax;
	int yMin;
	int yMax;
	unsigned maxPoints;
	unsigned maxContours;
	unsigned maxCompositePoints;
	unsigned maxCompositeContours;
	unsigned maxComponentElements;
	unsigned maxComponentDepth;
	bool allXMinIsLsb;
	};

	typedef struct head_maxp_info_t head_maxp_info_t;

	namespace OT {
	struct cff1_subset_accelerator_t;
	struct cff2_subset_accelerator_t;
	}

	struct hb_subset_plan_t
	{
	HB_INTERNAL hb_subset_plan_t (hb_face_t *,
	const hb_subset_input_t *input);

	HB_INTERNAL ~hb_subset_plan_t();

	hb_object_header_t header;

	bool successful;
	unsigned flags;
	bool attach_accelerator_data = false;
	bool force_long_loca = false;

	// The glyph subset
	hb_map_t *codepoint_to_glyph; // Needs to be heap-allocated

	// Old -> New glyph id mapping
	hb_map_t *glyph_map; // Needs to be heap-allocated
	hb_map_t *reverse_glyph_map; // Needs to be heap-allocated

	// Plan is only good for a specific source/dest so keep them with it
	hb_face_t *source;
	#ifndef HB_NO_SUBSET_CFF
	// These have to be immediately after source:
	hb_face_lazy_loader_t<OT::cff1_subset_accelerator_t, 1> cff1_accel;
	hb_face_lazy_loader_t<OT::cff2_subset_accelerator_t, 2> cff2_accel;
	#endif

	hb_face_t *dest;

	unsigned int _num_output_glyphs;

	bool all_axes_pinned;
	bool pinned_at_default;
	bool has_seac;

	// whether to insert a catch-all FeatureVariationRecord
	bool gsub_insert_catch_all_feature_variation_rec;
	bool gpos_insert_catch_all_feature_variation_rec;

	#define HB_SUBSET_PLAN_MEMBER(Type, Name) Type Name;
	#include "hb-subset-plan-member-list.hh"
	#undef HB_SUBSET_PLAN_MEMBER

	//recalculated head/maxp table info after instancing
	mutable head_maxp_info_t head_maxp_info;

	const hb_subset_accelerator_t* accelerator;
	hb_subset_accelerator_t* inprogress_accelerator;

	public:

	template<typename T>
	struct source_table_loader
	{
	hb_blob_ptr_t<T> operator () (hb_subset_plan_t *plan)
	{
	hb_lock_t lock (plan->accelerator ? &plan->accelerator->sanitized_table_cache_lock : nullptr);

	auto *cache = plan->accelerator ? &plan->accelerator->sanitized_table_cache : &plan->sanitized_table_cache;
	if (cache
	&& !cache->in_error ()
	&& cache->has (+T::tableTag)) {
	return hb_blob_reference (cache->get (+T::tableTag).get ());
	}

	hb::unique_ptr<hb_blob_t> table_blob {hb_sanitize_context_t ().reference_table<T> (plan->source)};
	hb_blob_t* ret = hb_blob_reference (table_blob.get ());

	if (likely (cache))
	cache->set (+T::tableTag, std::move (table_blob));

	return ret;
	}
	};

	template<typename T>
	auto source_table() HB_AUTO_RETURN (source_table_loader<T> {} (this))

	bool in_error () const { return !successful; }

	bool check_success(bool success)
	{
	successful = (successful && success);
	return successful;
	}

	/*
	* The set of input glyph ids which will be retained in the subset.
	* Does NOT include ids kept due to retain_gids. You probably want to use
	* glyph_map/reverse_glyph_map.
	*/
	inline const hb_set_t *
	glyphset () const
	{
	return &_glyphset;
	}

	/*
	* The set of input glyph ids which will be retained in the subset.
	*/
	inline const hb_set_t *
	glyphset_gsub () const
	{
	return &_glyphset_gsub;
	}

	/*
	* The total number of output glyphs in the final subset.
	*/
	inline unsigned int
	num_output_glyphs () const
	{
	return _num_output_glyphs;
	}

	inline bool new_gid_for_codepoint (hb_codepoint_t codepoint,
	hb_codepoint_t *new_gid) const
	{
	hb_codepoint_t old_gid = codepoint_to_glyph->get (codepoint);
	if (old_gid == HB_MAP_VALUE_INVALID)
	return false;

	return new_gid_for_old_gid (old_gid, new_gid);
	}

	inline bool new_gid_for_old_gid (hb_codepoint_t old_gid,
	hb_codepoint_t *new_gid) const
	{
	hb_codepoint_t gid = glyph_map->get (old_gid);
	if (gid == HB_MAP_VALUE_INVALID)
	return false;

	*new_gid = gid;
	return true;
	}

	inline bool old_gid_for_new_gid (hb_codepoint_t new_gid,
	hb_codepoint_t *old_gid) const
	{
	hb_codepoint_t gid = reverse_glyph_map->get (new_gid);
	if (gid == HB_MAP_VALUE_INVALID)
	return false;

	*old_gid = gid;
	return true;
	}

	inline bool
	add_table (hb_tag_t tag,
	hb_blob_t *contents)
	{
	if (HB_DEBUG_SUBSET)
	{
	hb_blob_t *source_blob = source->reference_table (tag);
	DEBUG_MSG(SUBSET, nullptr, "add table %c%c%c%c, dest %u bytes, source %u bytes",
	HB_UNTAG(tag),
	hb_blob_get_length (contents),
	hb_blob_get_length (source_blob));
	hb_blob_destroy (source_blob);
	}
	return hb_face_builder_add_table (dest, tag, contents);
	}
	};


	#endif /* HB_SUBSET_PLAN_HH */