/* * 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, Rod Sheeter, Behdad Esfahbod */ #include "hb.hh" #include "hb-open-type.hh" #include "hb-subset.hh" #include "hb-open-file.hh" #include "hb-ot-cmap-table.hh" #include "hb-ot-glyf-table.hh" #include "hb-ot-hdmx-table.hh" #include "hb-ot-head-table.hh" #include "hb-ot-hhea-table.hh" #include "hb-ot-hmtx-table.hh" #include "hb-ot-maxp-table.hh" #include "OT/Color/CBDT/CBDT.hh" #include "OT/Color/COLR/COLR.hh" #include "OT/Color/CPAL/CPAL.hh" #include "OT/Color/sbix/sbix.hh" #include "hb-ot-os2-table.hh" #include "hb-ot-post-table.hh" #include "hb-ot-post-table-v2subset.hh" #include "hb-ot-cff1-table.hh" #include "hb-ot-cff2-table.hh" #include "hb-ot-vorg-table.hh" #include "hb-ot-name-table.hh" #include "hb-ot-layout-base-table.hh" #include "hb-ot-layout-gsub-table.hh" #include "hb-ot-layout-gpos-table.hh" #include "hb-ot-var-avar-table.hh" #include "hb-ot-var-cvar-table.hh" #include "hb-ot-var-fvar-table.hh" #include "hb-ot-var-gvar-table.hh" #include "hb-ot-var-hvar-table.hh" #include "hb-ot-var-mvar-table.hh" #include "hb-ot-math-table.hh" #include "hb-ot-stat-table.hh" #include "hb-repacker.hh" #include "hb-subset-accelerator.hh" GSUB; GPOS; #ifndef HB_NO_SUBSET_CFF template<> struct hb_subset_plan_t::source_table_loader<const OT::cff1> { … }; template<> struct hb_subset_plan_t::source_table_loader<const OT::cff2> { … }; #endif /** * SECTION:hb-subset * @title: hb-subset * @short_description: Subsets font files. * @include: hb-subset.h * * Subsetting reduces the codepoint coverage of font files and removes all data * that is no longer needed. A subset input describes the desired subset. The input is * provided along with a font to the subsetting operation. Output is a new font file * containing only the data specified in the input. * * Currently most outline and bitmap tables are supported: glyf, CFF, CFF2, sbix, * COLR, and CBDT/CBLC. This also includes fonts with variable outlines via OpenType * variations. Notably EBDT/EBLC and SVG are not supported. Layout subsetting is supported * only for OpenType Layout tables (GSUB, GPOS, GDEF). Notably subsetting of graphite or AAT tables * is not yet supported. * * Fonts with graphite or AAT tables may still be subsetted but will likely need to use the * retain glyph ids option and configure the subset to pass through the layout tables untouched. */ hb_user_data_key_t _hb_subset_accelerator_user_data_key = …; /* * The list of tables in the open type spec. Used to check for tables that may need handling * if we are unable to list the tables in a face. */ static hb_tag_t known_tables[] { … }; static bool _table_is_empty (const hb_face_t *face, hb_tag_t tag) { … } static unsigned int _get_table_tags (const hb_subset_plan_t* plan, unsigned int start_offset, unsigned int *table_count, /* IN/OUT */ hb_tag_t *table_tags /* OUT */) { … } static unsigned _plan_estimate_subset_table_size (hb_subset_plan_t *plan, unsigned table_len, hb_tag_t table_tag) { … } /* * Repack the serialization buffer if any offset overflows exist. */ static hb_blob_t* _repack (hb_tag_t tag, const hb_serialize_context_t& c) { … } template<typename TableType> static bool _try_subset (const TableType *table, hb_vector_t<char>* buf, hb_subset_context_t* c /* OUT */) { … } template <typename T> static auto _do_destroy (T &t, hb_priority<1>) HB_RETURN (void, t.destroy ()) template <typename T> static void _do_destroy (T &t, hb_priority<0>) { … } template<typename TableType> static bool _subset (hb_subset_plan_t *plan, hb_vector_t<char> &buf) { … } static bool _is_table_present (hb_face_t *source, hb_tag_t tag) { … } static bool _should_drop_table (hb_subset_plan_t *plan, hb_tag_t tag) { … } static bool _passthrough (hb_subset_plan_t *plan, hb_tag_t tag) { … } static bool _dependencies_satisfied (hb_subset_plan_t *plan, hb_tag_t tag, const hb_set_t &subsetted_tags, const hb_set_t &pending_subset_tags) { … } static bool _subset_table (hb_subset_plan_t *plan, hb_vector_t<char> &buf, hb_tag_t tag) { … } static void _attach_accelerator_data (hb_subset_plan_t* plan, hb_face_t* face /* IN/OUT */) { … } /** * hb_subset_or_fail: * @source: font face data to be subset. * @input: input to use for the subsetting. * * Subsets a font according to provided input. Returns nullptr * if the subset operation fails or the face has no glyphs. * * Since: 2.9.0 **/ hb_face_t * hb_subset_or_fail (hb_face_t *source, const hb_subset_input_t *input) { … } /** * hb_subset_plan_execute_or_fail: * @plan: a subsetting plan. * * Executes the provided subsetting @plan. * * Return value: * on success returns a reference to generated font subset. If the subsetting operation fails * returns nullptr. * * Since: 4.0.0 **/ hb_face_t * hb_subset_plan_execute_or_fail (hb_subset_plan_t *plan) { … }
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