2018-01-31 23:53:09 +01:00
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/*
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2018-02-10 20:37:28 +01:00
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* Copyright © 2018 Google, Inc.
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2018-01-31 23:53:09 +01:00
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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2018-02-15 00:04:15 +01:00
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* Google Author(s): Garret Rieger, Rod Sheeter, Behdad Esfahbod
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2018-01-31 23:53:09 +01:00
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*/
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2018-08-26 07:36:36 +02:00
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#include "hb.hh"
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#include "hb-open-type.hh"
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2018-02-08 00:59:36 +01:00
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2018-08-26 07:36:36 +02:00
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#include "hb-subset.hh"
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2018-01-31 23:53:09 +01:00
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2018-08-26 07:36:36 +02:00
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#include "hb-open-file.hh"
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2018-02-08 00:59:36 +01:00
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#include "hb-ot-cmap-table.hh"
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2018-02-07 01:04:09 +01:00
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#include "hb-ot-glyf-table.hh"
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2018-02-21 23:18:49 +01:00
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#include "hb-ot-hdmx-table.hh"
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2018-02-12 20:22:32 +01:00
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#include "hb-ot-head-table.hh"
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2018-02-14 23:16:25 +01:00
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#include "hb-ot-hhea-table.hh"
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#include "hb-ot-hmtx-table.hh"
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2018-02-12 20:22:32 +01:00
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#include "hb-ot-maxp-table.hh"
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2020-01-09 16:44:20 +01:00
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#include "hb-ot-color-sbix-table.hh"
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2020-01-24 14:52:23 +01:00
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#include "hb-ot-color-colr-table.hh"
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2021-05-11 20:44:32 +02:00
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#include "hb-ot-color-cpal-table.hh"
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2018-02-13 02:31:01 +01:00
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#include "hb-ot-os2-table.hh"
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2018-03-07 03:33:39 +01:00
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#include "hb-ot-post-table.hh"
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2021-07-21 05:05:35 +02:00
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#include "hb-ot-post-table-v2subset.hh"
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2018-08-16 09:13:09 +02:00
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#include "hb-ot-cff1-table.hh"
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2018-07-18 23:17:52 +02:00
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#include "hb-ot-cff2-table.hh"
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2018-09-20 18:45:43 +02:00
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#include "hb-ot-vorg-table.hh"
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2019-03-29 18:34:32 +01:00
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#include "hb-ot-name-table.hh"
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2020-01-21 19:35:43 +01:00
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#include "hb-ot-color-cbdt-table.hh"
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2018-09-06 01:24:28 +02:00
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#include "hb-ot-layout-gsub-table.hh"
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#include "hb-ot-layout-gpos-table.hh"
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2019-02-26 20:11:50 +01:00
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#include "hb-ot-var-gvar-table.hh"
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2019-02-21 00:48:29 +01:00
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#include "hb-ot-var-hvar-table.hh"
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2021-09-20 23:42:51 +02:00
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#include "hb-ot-math-table.hh"
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2022-06-30 18:36:19 +02:00
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#include "hb-ot-stat-table.hh"
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2020-10-30 20:16:26 +01:00
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#include "hb-repacker.hh"
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2018-02-07 01:04:09 +01:00
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2022-06-30 01:52:08 +02:00
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using OT::Layout::GSUB;
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2022-06-29 01:55:32 +02:00
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using OT::Layout::GPOS;
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2022-03-24 00:28:22 +01:00
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2021-07-22 22:00:34 +02:00
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/**
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* SECTION:hb-subset
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* @title: hb-subset
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* @short_description: Subsets font files.
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* @include: hb-subset.h
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*
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* Subsetting reduces the codepoint coverage of font files and removes all data
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* that is no longer needed. A subset input describes the desired subset. The input is
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* provided along with a font to the subsetting operation. Output is a new font file
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* containing only the data specified in the input.
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2021-07-27 20:21:19 +02:00
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*
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* Currently most outline and bitmap tables are supported: glyf, CFF, CFF2, sbix,
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* COLR, and CBDT/CBLC. This also includes fonts with variable outlines via OpenType
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* variations. Notably EBDT/EBLC and SVG are not supported. Layout subsetting is supported
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* only for OpenType Layout tables (GSUB, GPOS, GDEF). Notably subsetting of graphite or AAT tables
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* is not yet supported.
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*
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* Fonts with graphite or AAT tables may still be subsetted but will likely need to use the
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* retain glyph ids option and configure the subset to pass through the layout tables untouched.
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2021-07-22 22:00:34 +02:00
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*/
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2018-02-07 18:44:35 +01:00
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2022-05-26 00:22:35 +02:00
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/*
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* The list of tables in the open type spec. Used to check for tables that may need handling
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* if we are unable to list the tables in a face.
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*/
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static hb_tag_t known_tables[] {
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HB_TAG ('a', 'v', 'a', 'r'),
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HB_OT_TAG_BASE,
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HB_OT_TAG_CBDT,
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HB_OT_TAG_CBLC,
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HB_OT_TAG_cff1,
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HB_OT_TAG_cff2,
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HB_OT_TAG_cmap,
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HB_OT_TAG_COLR,
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HB_OT_TAG_CPAL,
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HB_TAG ('c', 'v', 'a', 'r'),
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HB_TAG ('c', 'v', 't', ' '),
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HB_TAG ('D', 'S', 'I', 'G'),
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HB_TAG ('E', 'B', 'D', 'T'),
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HB_TAG ('E', 'B', 'L', 'C'),
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HB_TAG ('E', 'B', 'S', 'C'),
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HB_TAG ('f', 'p', 'g', 'm'),
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HB_TAG ('f', 'v', 'a', 'r'),
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HB_TAG ('g', 'a', 's', 'p'),
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HB_OT_TAG_GDEF,
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HB_OT_TAG_glyf,
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HB_OT_TAG_GPOS,
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HB_OT_TAG_GSUB,
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HB_OT_TAG_gvar,
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HB_OT_TAG_hdmx,
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HB_OT_TAG_head,
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HB_OT_TAG_hhea,
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HB_OT_TAG_hmtx,
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HB_OT_TAG_HVAR,
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HB_OT_TAG_JSTF,
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HB_TAG ('k', 'e', 'r', 'n'),
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HB_OT_TAG_loca,
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HB_TAG ('L', 'T', 'S', 'H'),
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HB_OT_TAG_MATH,
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HB_OT_TAG_maxp,
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HB_TAG ('M', 'E', 'R', 'G'),
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HB_TAG ('m', 'e', 't', 'a'),
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HB_TAG ('M', 'V', 'A', 'R'),
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HB_TAG ('P', 'C', 'L', 'T'),
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HB_OT_TAG_post,
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HB_TAG ('p', 'r', 'e', 'p'),
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HB_OT_TAG_sbix,
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HB_TAG ('S', 'T', 'A', 'T'),
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HB_TAG ('S', 'V', 'G', ' '),
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HB_TAG ('V', 'D', 'M', 'X'),
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HB_OT_TAG_vhea,
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HB_OT_TAG_vmtx,
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HB_OT_TAG_VORG,
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HB_OT_TAG_VVAR,
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HB_OT_TAG_name,
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HB_OT_TAG_OS2
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};
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2022-05-25 23:16:37 +02:00
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static bool _table_is_empty (const hb_face_t *face, hb_tag_t tag)
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{
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hb_blob_t* blob = hb_face_reference_table (face, tag);
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bool result = (blob == hb_blob_get_empty ());
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hb_blob_destroy (blob);
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return result;
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}
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static unsigned int
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2022-05-25 23:49:12 +02:00
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_get_table_tags (const hb_subset_plan_t* plan,
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2022-05-25 23:16:37 +02:00
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unsigned int start_offset,
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unsigned int *table_count, /* IN/OUT */
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hb_tag_t *table_tags /* OUT */)
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{
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2022-05-25 23:49:12 +02:00
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unsigned num_tables = hb_face_get_table_tags (plan->source, 0, nullptr, nullptr);
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2022-05-25 23:16:37 +02:00
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if (num_tables)
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2022-05-25 23:49:12 +02:00
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return hb_face_get_table_tags (plan->source, start_offset, table_count, table_tags);
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2022-05-25 23:16:37 +02:00
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2022-05-26 00:35:23 +02:00
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// If face has 0 tables associated with it, assume that it was built from
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2022-05-25 23:16:37 +02:00
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// hb_face_create_tables and thus is unable to list its tables. Fallback to
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// checking each table type we can handle for existence instead.
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2022-05-25 23:49:12 +02:00
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auto it =
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hb_concat (
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2022-05-26 00:22:35 +02:00
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+ hb_array (known_tables)
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2022-05-25 23:49:12 +02:00
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| hb_filter ([&] (hb_tag_t tag) {
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return !_table_is_empty (plan->source, tag) && !plan->no_subset_tables->has (tag);
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2022-05-26 00:22:35 +02:00
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})
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| hb_map ([] (hb_tag_t tag) -> hb_tag_t { return tag; }),
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2022-05-25 23:16:37 +02:00
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2022-05-25 23:49:12 +02:00
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plan->no_subset_tables->iter ()
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| hb_filter([&] (hb_tag_t tag) {
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return !_table_is_empty (plan->source, tag);
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}));
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2022-05-25 23:16:37 +02:00
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2022-05-25 23:49:12 +02:00
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it += start_offset;
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2022-05-25 23:16:37 +02:00
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unsigned num_written = 0;
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while (bool (it) && num_written < *table_count)
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2022-05-25 23:49:12 +02:00
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table_tags[num_written++] = *it++;
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2022-05-25 23:16:37 +02:00
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*table_count = num_written;
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2022-05-25 23:49:12 +02:00
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return num_written;
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2022-05-25 23:16:37 +02:00
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}
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2020-02-05 12:32:20 +01:00
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static unsigned
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2022-05-11 21:05:41 +02:00
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_plan_estimate_subset_table_size (hb_subset_plan_t *plan,
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unsigned table_len,
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bool same_size)
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2018-01-31 23:53:09 +01:00
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{
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2020-02-05 12:32:20 +01:00
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unsigned src_glyphs = plan->source->get_num_glyphs ();
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unsigned dst_glyphs = plan->glyphset ()->get_population ();
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2018-09-06 01:24:28 +02:00
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2022-05-11 21:05:41 +02:00
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if (unlikely (!src_glyphs) || same_size)
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2018-09-07 16:24:22 +02:00
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return 512 + table_len;
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2020-02-05 12:32:20 +01:00
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return 512 + (unsigned) (table_len * sqrt ((double) dst_glyphs / src_glyphs));
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2018-01-31 23:53:09 +01:00
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}
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2020-10-30 20:16:26 +01:00
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/*
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* Repack the serialization buffer if any offset overflows exist.
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*/
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static hb_blob_t*
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2020-11-03 23:01:42 +01:00
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_repack (hb_tag_t tag, const hb_serialize_context_t& c)
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2020-10-30 20:16:26 +01:00
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{
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2020-11-03 23:01:42 +01:00
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if (tag != HB_OT_TAG_GPOS
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&& tag != HB_OT_TAG_GSUB)
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2021-04-06 00:48:34 +02:00
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{
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// Check for overflow in a non-handled table.
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return c.successful () ? c.copy_blob () : nullptr;
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}
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2020-11-03 23:01:42 +01:00
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2021-03-17 23:53:10 +01:00
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if (!c.offset_overflow ())
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2020-10-30 20:16:26 +01:00
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return c.copy_blob ();
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2021-12-06 21:54:19 +01:00
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hb_blob_t* result = hb_resolve_overflows (c.object_graph (), tag);
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2020-10-30 20:16:26 +01:00
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2021-12-06 21:54:19 +01:00
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if (unlikely (!result))
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{
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DEBUG_MSG (SUBSET, nullptr, "OT::%c%c%c%c offset overflow resolution failed.",
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HB_UNTAG (tag));
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2020-10-30 20:16:26 +01:00
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return nullptr;
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2021-12-06 21:54:19 +01:00
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}
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2020-10-30 20:16:26 +01:00
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2021-12-06 21:54:19 +01:00
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return result;
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2020-10-30 20:16:26 +01:00
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}
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2020-11-11 01:15:37 +01:00
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template<typename TableType>
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static
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bool
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_try_subset (const TableType *table,
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hb_vector_t<char>* buf,
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hb_subset_context_t* c /* OUT */)
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{
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c->serializer->start_serialize<TableType> ();
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2021-05-27 20:40:34 +02:00
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if (c->serializer->in_error ()) return false;
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2020-11-11 01:15:37 +01:00
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bool needed = table->subset (c);
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2021-03-17 23:53:10 +01:00
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if (!c->serializer->ran_out_of_room ())
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2020-11-11 01:15:37 +01:00
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{
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c->serializer->end_serialize ();
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return needed;
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}
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2022-05-11 20:49:16 +02:00
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unsigned buf_size = buf->allocated;
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2022-05-11 02:06:53 +02:00
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buf_size = buf_size * 2 + 16;
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2022-07-13 23:32:19 +02:00
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2020-11-11 01:15:37 +01:00
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DEBUG_MSG (SUBSET, nullptr, "OT::%c%c%c%c ran out of room; reallocating to %u bytes.",
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HB_UNTAG (c->table_tag), buf_size);
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2022-07-13 23:32:19 +02:00
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if (unlikely (buf_size > c->source_blob->length * 16 ||
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!buf->alloc (buf_size)))
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2020-11-11 01:15:37 +01:00
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{
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DEBUG_MSG (SUBSET, nullptr, "OT::%c%c%c%c failed to reallocate %u bytes.",
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HB_UNTAG (c->table_tag), buf_size);
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return needed;
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}
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2022-05-11 20:49:16 +02:00
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c->serializer->reset (buf->arrayZ, buf->allocated);
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return _try_subset (table, buf, c);
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2020-11-11 01:15:37 +01:00
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}
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2018-09-06 01:24:28 +02:00
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template<typename TableType>
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static bool
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2022-05-11 02:06:53 +02:00
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_subset (hb_subset_plan_t *plan, hb_vector_t<char> &buf)
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2018-01-31 23:53:09 +01:00
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{
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2022-07-07 22:16:16 +02:00
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hb_blob_ptr_t<TableType> source_blob = plan->source_table<TableType> ();
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const TableType *table = source_blob.get ();
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2018-01-31 23:53:09 +01:00
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2018-09-06 01:24:28 +02:00
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hb_tag_t tag = TableType::tableTag;
|
2022-07-07 22:16:16 +02:00
|
|
|
if (!source_blob.get_blob()->data)
|
2018-09-06 01:24:28 +02:00
|
|
|
{
|
2020-11-11 01:15:37 +01:00
|
|
|
DEBUG_MSG (SUBSET, nullptr,
|
|
|
|
"OT::%c%c%c%c::subset sanitize failed on source table.", HB_UNTAG (tag));
|
2022-07-07 22:16:16 +02:00
|
|
|
source_blob.destroy ();
|
2020-11-11 01:15:37 +01:00
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
2022-05-11 21:05:41 +02:00
|
|
|
/* Tables that we want to allocate same space as the source table. For GSUB/GPOS it's
|
|
|
|
* because those are expensive to subset, so giving them more room is fine. */
|
|
|
|
bool same_size_table = TableType::tableTag == HB_OT_TAG_GSUB ||
|
|
|
|
TableType::tableTag == HB_OT_TAG_GPOS ||
|
|
|
|
TableType::tableTag == HB_OT_TAG_name;
|
|
|
|
|
2022-07-07 22:16:16 +02:00
|
|
|
unsigned buf_size = _plan_estimate_subset_table_size (plan, source_blob.get_length (), same_size_table);
|
2020-11-11 01:15:37 +01:00
|
|
|
DEBUG_MSG (SUBSET, nullptr,
|
|
|
|
"OT::%c%c%c%c initial estimated table size: %u bytes.", HB_UNTAG (tag), buf_size);
|
|
|
|
if (unlikely (!buf.alloc (buf_size)))
|
|
|
|
{
|
|
|
|
DEBUG_MSG (SUBSET, nullptr, "OT::%c%c%c%c failed to allocate %u bytes.", HB_UNTAG (tag), buf_size);
|
2022-07-07 22:16:16 +02:00
|
|
|
source_blob.destroy ();
|
2020-11-11 01:15:37 +01:00
|
|
|
return false;
|
2018-09-06 01:24:28 +02:00
|
|
|
}
|
|
|
|
|
2020-11-11 01:15:37 +01:00
|
|
|
bool needed = false;
|
2022-05-11 20:49:16 +02:00
|
|
|
hb_serialize_context_t serializer (buf.arrayZ, buf.allocated);
|
2020-11-11 01:15:37 +01:00
|
|
|
{
|
2022-07-07 22:16:16 +02:00
|
|
|
hb_subset_context_t c (source_blob.get_blob (), plan, &serializer, tag);
|
2022-05-11 20:49:16 +02:00
|
|
|
needed = _try_subset (table, &buf, &c);
|
2020-11-11 01:15:37 +01:00
|
|
|
}
|
2022-07-07 22:16:16 +02:00
|
|
|
source_blob.destroy ();
|
2020-11-11 01:15:37 +01:00
|
|
|
|
2021-03-18 18:51:26 +01:00
|
|
|
if (serializer.in_error () && !serializer.only_offset_overflow ())
|
2020-11-11 01:15:37 +01:00
|
|
|
{
|
|
|
|
DEBUG_MSG (SUBSET, nullptr, "OT::%c%c%c%c::subset FAILED!", HB_UNTAG (tag));
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!needed)
|
|
|
|
{
|
|
|
|
DEBUG_MSG (SUBSET, nullptr, "OT::%c%c%c%c::subset table subsetted to empty.", HB_UNTAG (tag));
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
bool result = false;
|
|
|
|
hb_blob_t *dest_blob = _repack (tag, serializer);
|
|
|
|
if (dest_blob)
|
|
|
|
{
|
|
|
|
DEBUG_MSG (SUBSET, nullptr,
|
|
|
|
"OT::%c%c%c%c final subset table size: %u bytes.",
|
|
|
|
HB_UNTAG (tag), dest_blob->length);
|
|
|
|
result = plan->add_table (tag, dest_blob);
|
|
|
|
hb_blob_destroy (dest_blob);
|
|
|
|
}
|
|
|
|
|
|
|
|
DEBUG_MSG (SUBSET, nullptr, "OT::%c%c%c%c::subset %s",
|
|
|
|
HB_UNTAG (tag), result ? "success" : "FAILED!");
|
2018-09-06 01:24:28 +02:00
|
|
|
return result;
|
2018-01-31 23:53:09 +01:00
|
|
|
}
|
|
|
|
|
2020-02-04 19:36:51 +01:00
|
|
|
static bool
|
2022-05-26 00:35:23 +02:00
|
|
|
_is_table_present (hb_face_t *source, hb_tag_t tag)
|
2020-02-04 19:36:51 +01:00
|
|
|
{
|
2022-05-26 00:35:23 +02:00
|
|
|
|
|
|
|
if (!hb_face_get_table_tags (source, 0, nullptr, nullptr)) {
|
|
|
|
// If face has 0 tables associated with it, assume that it was built from
|
|
|
|
// hb_face_create_tables and thus is unable to list its tables. Fallback to
|
|
|
|
// checking if the blob associated with tag is empty.
|
|
|
|
return !_table_is_empty (source, tag);
|
|
|
|
}
|
|
|
|
|
2020-02-05 12:31:25 +01:00
|
|
|
hb_tag_t table_tags[32];
|
|
|
|
unsigned offset = 0, num_tables = ARRAY_LENGTH (table_tags);
|
2022-06-16 00:57:16 +02:00
|
|
|
while (((void) hb_face_get_table_tags (source, offset, &num_tables, table_tags), num_tables))
|
2020-02-04 21:58:21 +01:00
|
|
|
{
|
|
|
|
for (unsigned i = 0; i < num_tables; ++i)
|
2020-02-05 12:31:25 +01:00
|
|
|
if (table_tags[i] == tag)
|
2020-02-04 21:58:21 +01:00
|
|
|
return true;
|
|
|
|
offset += num_tables;
|
2020-02-04 19:36:51 +01:00
|
|
|
}
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
static bool
|
|
|
|
_should_drop_table (hb_subset_plan_t *plan, hb_tag_t tag)
|
|
|
|
{
|
|
|
|
if (plan->drop_tables->has (tag))
|
|
|
|
return true;
|
|
|
|
|
2020-02-05 12:30:25 +01:00
|
|
|
switch (tag)
|
|
|
|
{
|
|
|
|
case HB_TAG ('c','v','a','r'): /* hint table, fallthrough */
|
2022-06-22 04:29:52 +02:00
|
|
|
return plan->all_axes_pinned || (plan->flags & HB_SUBSET_FLAGS_NO_HINTING);
|
|
|
|
|
2020-02-05 12:30:25 +01:00
|
|
|
case HB_TAG ('c','v','t',' '): /* hint table, fallthrough */
|
|
|
|
case HB_TAG ('f','p','g','m'): /* hint table, fallthrough */
|
|
|
|
case HB_TAG ('p','r','e','p'): /* hint table, fallthrough */
|
|
|
|
case HB_TAG ('h','d','m','x'): /* hint table, fallthrough */
|
|
|
|
case HB_TAG ('V','D','M','X'): /* hint table, fallthrough */
|
2021-07-30 00:07:13 +02:00
|
|
|
return plan->flags & HB_SUBSET_FLAGS_NO_HINTING;
|
2020-02-04 19:36:51 +01:00
|
|
|
|
|
|
|
#ifdef HB_NO_SUBSET_LAYOUT
|
|
|
|
// Drop Layout Tables if requested.
|
2020-02-05 12:30:25 +01:00
|
|
|
case HB_OT_TAG_GDEF:
|
|
|
|
case HB_OT_TAG_GPOS:
|
|
|
|
case HB_OT_TAG_GSUB:
|
|
|
|
case HB_TAG ('m','o','r','x'):
|
|
|
|
case HB_TAG ('m','o','r','t'):
|
|
|
|
case HB_TAG ('k','e','r','x'):
|
|
|
|
case HB_TAG ('k','e','r','n'):
|
|
|
|
return true;
|
2020-02-04 19:36:51 +01:00
|
|
|
#endif
|
|
|
|
|
2022-06-22 04:29:52 +02:00
|
|
|
case HB_TAG ('a','v','a','r'):
|
|
|
|
case HB_TAG ('f','v','a','r'):
|
|
|
|
case HB_TAG ('g','v','a','r'):
|
|
|
|
case HB_OT_TAG_HVAR:
|
|
|
|
case HB_OT_TAG_VVAR:
|
|
|
|
case HB_TAG ('M','V','A','R'):
|
|
|
|
return plan->all_axes_pinned;
|
|
|
|
|
2020-02-05 12:30:25 +01:00
|
|
|
default:
|
|
|
|
return false;
|
2020-02-04 19:36:51 +01:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2021-06-10 02:46:47 +02:00
|
|
|
static bool
|
|
|
|
_passthrough (hb_subset_plan_t *plan, hb_tag_t tag)
|
|
|
|
{
|
|
|
|
hb_blob_t *source_table = hb_face_reference_table (plan->source, tag);
|
|
|
|
bool result = plan->add_table (tag, source_table);
|
|
|
|
hb_blob_destroy (source_table);
|
|
|
|
return result;
|
|
|
|
}
|
|
|
|
|
2018-02-10 22:17:28 +01:00
|
|
|
static bool
|
2022-05-11 02:06:53 +02:00
|
|
|
_subset_table (hb_subset_plan_t *plan,
|
|
|
|
hb_vector_t<char> &buf,
|
|
|
|
hb_tag_t tag)
|
2018-02-09 03:18:16 +01:00
|
|
|
{
|
2021-06-10 02:46:47 +02:00
|
|
|
if (plan->no_subset_tables->has (tag)) {
|
|
|
|
return _passthrough (plan, tag);
|
|
|
|
}
|
|
|
|
|
2020-02-05 12:30:25 +01:00
|
|
|
DEBUG_MSG (SUBSET, nullptr, "subset %c%c%c%c", HB_UNTAG (tag));
|
|
|
|
switch (tag)
|
|
|
|
{
|
2022-05-11 02:06:53 +02:00
|
|
|
case HB_OT_TAG_glyf: return _subset<const OT::glyf> (plan, buf);
|
|
|
|
case HB_OT_TAG_hdmx: return _subset<const OT::hdmx> (plan, buf);
|
|
|
|
case HB_OT_TAG_name: return _subset<const OT::name> (plan, buf);
|
2020-02-05 12:30:25 +01:00
|
|
|
case HB_OT_TAG_head:
|
2022-05-26 00:35:23 +02:00
|
|
|
if (_is_table_present (plan->source, HB_OT_TAG_glyf) && !_should_drop_table (plan, HB_OT_TAG_glyf))
|
2020-02-05 12:30:25 +01:00
|
|
|
return true; /* skip head, handled by glyf */
|
2022-05-11 02:06:53 +02:00
|
|
|
return _subset<const OT::head> (plan, buf);
|
2020-02-05 12:30:25 +01:00
|
|
|
case HB_OT_TAG_hhea: return true; /* skip hhea, handled by hmtx */
|
2022-05-11 02:06:53 +02:00
|
|
|
case HB_OT_TAG_hmtx: return _subset<const OT::hmtx> (plan, buf);
|
2020-02-05 12:30:25 +01:00
|
|
|
case HB_OT_TAG_vhea: return true; /* skip vhea, handled by vmtx */
|
2022-05-11 02:06:53 +02:00
|
|
|
case HB_OT_TAG_vmtx: return _subset<const OT::vmtx> (plan, buf);
|
|
|
|
case HB_OT_TAG_maxp: return _subset<const OT::maxp> (plan, buf);
|
|
|
|
case HB_OT_TAG_sbix: return _subset<const OT::sbix> (plan, buf);
|
2020-02-05 12:30:25 +01:00
|
|
|
case HB_OT_TAG_loca: return true; /* skip loca, handled by glyf */
|
2022-05-11 02:06:53 +02:00
|
|
|
case HB_OT_TAG_cmap: return _subset<const OT::cmap> (plan, buf);
|
|
|
|
case HB_OT_TAG_OS2 : return _subset<const OT::OS2 > (plan, buf);
|
|
|
|
case HB_OT_TAG_post: return _subset<const OT::post> (plan, buf);
|
|
|
|
case HB_OT_TAG_COLR: return _subset<const OT::COLR> (plan, buf);
|
|
|
|
case HB_OT_TAG_CPAL: return _subset<const OT::CPAL> (plan, buf);
|
|
|
|
case HB_OT_TAG_CBLC: return _subset<const OT::CBLC> (plan, buf);
|
2020-02-05 14:01:21 +01:00
|
|
|
case HB_OT_TAG_CBDT: return true; /* skip CBDT, handled by CBLC */
|
2022-05-11 02:06:53 +02:00
|
|
|
case HB_OT_TAG_MATH: return _subset<const OT::MATH> (plan, buf);
|
2019-05-11 08:36:42 +02:00
|
|
|
|
|
|
|
#ifndef HB_NO_SUBSET_CFF
|
2022-05-11 02:06:53 +02:00
|
|
|
case HB_OT_TAG_cff1: return _subset<const OT::cff1> (plan, buf);
|
|
|
|
case HB_OT_TAG_cff2: return _subset<const OT::cff2> (plan, buf);
|
|
|
|
case HB_OT_TAG_VORG: return _subset<const OT::VORG> (plan, buf);
|
2019-05-11 08:36:42 +02:00
|
|
|
#endif
|
2019-04-13 04:50:22 +02:00
|
|
|
|
2019-05-11 08:15:58 +02:00
|
|
|
#ifndef HB_NO_SUBSET_LAYOUT
|
2022-05-11 02:06:53 +02:00
|
|
|
case HB_OT_TAG_GDEF: return _subset<const OT::GDEF> (plan, buf);
|
|
|
|
case HB_OT_TAG_GSUB: return _subset<const GSUB> (plan, buf);
|
2022-06-25 01:14:30 +02:00
|
|
|
case HB_OT_TAG_GPOS: return _subset<const GPOS> (plan, buf);
|
2022-05-11 02:06:53 +02:00
|
|
|
case HB_OT_TAG_gvar: return _subset<const OT::gvar> (plan, buf);
|
|
|
|
case HB_OT_TAG_HVAR: return _subset<const OT::HVAR> (plan, buf);
|
|
|
|
case HB_OT_TAG_VVAR: return _subset<const OT::VVAR> (plan, buf);
|
2019-04-13 04:50:22 +02:00
|
|
|
#endif
|
2022-06-30 18:36:19 +02:00
|
|
|
case HB_OT_TAG_STAT:
|
|
|
|
/*TODO(qxliu): change the condition as we support more complex
|
|
|
|
* instancing operation*/
|
|
|
|
if (plan->all_axes_pinned) return _subset<const OT::STAT> (plan, buf);
|
|
|
|
else return _passthrough (plan, tag);
|
2018-09-06 01:24:28 +02:00
|
|
|
|
2020-02-05 12:30:25 +01:00
|
|
|
default:
|
2021-07-30 00:07:13 +02:00
|
|
|
if (plan->flags & HB_SUBSET_FLAGS_PASSTHROUGH_UNRECOGNIZED)
|
2021-06-10 02:46:47 +02:00
|
|
|
return _passthrough (plan, tag);
|
|
|
|
|
|
|
|
// Drop table
|
|
|
|
return true;
|
2018-02-12 20:22:32 +01:00
|
|
|
}
|
2018-02-09 03:18:16 +01:00
|
|
|
}
|
|
|
|
|
2021-06-10 01:33:50 +02:00
|
|
|
/**
|
|
|
|
* 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.
|
|
|
|
*
|
2021-08-18 09:32:04 +02:00
|
|
|
* Since: 2.9.0
|
2021-06-10 01:33:50 +02:00
|
|
|
**/
|
|
|
|
hb_face_t *
|
|
|
|
hb_subset_or_fail (hb_face_t *source, const hb_subset_input_t *input)
|
2018-01-31 23:53:09 +01:00
|
|
|
{
|
2018-11-15 20:40:56 +01:00
|
|
|
if (unlikely (!input || !source)) return hb_face_get_empty ();
|
2018-01-31 23:53:09 +01:00
|
|
|
|
2022-02-12 01:01:33 +01:00
|
|
|
hb_subset_plan_t *plan = hb_subset_plan_create_or_fail (source, input);
|
|
|
|
if (unlikely (!plan)) {
|
2021-06-10 01:33:50 +02:00
|
|
|
return nullptr;
|
2021-03-25 19:39:57 +01:00
|
|
|
}
|
2018-02-07 00:37:34 +01:00
|
|
|
|
2022-02-11 23:54:23 +01:00
|
|
|
hb_face_t * result = hb_subset_plan_execute_or_fail (plan);
|
2022-02-11 21:44:58 +01:00
|
|
|
hb_subset_plan_destroy (plan);
|
|
|
|
return result;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/**
|
2022-02-18 02:16:31 +01:00
|
|
|
* hb_subset_plan_execute_or_fail:
|
2022-02-11 21:44:58 +01:00
|
|
|
* @plan: a subsetting plan.
|
|
|
|
*
|
2022-02-18 02:16:31 +01:00
|
|
|
* Executes the provided subsetting @plan.
|
|
|
|
*
|
|
|
|
* Return value:
|
|
|
|
* on success returns a reference to generated font subset. If the subsetting operation fails
|
|
|
|
* returns nullptr.
|
2022-02-11 21:44:58 +01:00
|
|
|
*
|
2022-03-01 20:27:32 +01:00
|
|
|
* Since: 4.0.0
|
2022-02-11 21:44:58 +01:00
|
|
|
**/
|
|
|
|
hb_face_t *
|
2022-02-11 23:54:23 +01:00
|
|
|
hb_subset_plan_execute_or_fail (hb_subset_plan_t *plan)
|
2022-02-11 21:44:58 +01:00
|
|
|
{
|
2022-02-12 01:01:33 +01:00
|
|
|
if (unlikely (!plan || plan->in_error ())) {
|
2022-02-11 21:44:58 +01:00
|
|
|
return nullptr;
|
|
|
|
}
|
|
|
|
|
2019-09-01 23:11:48 +02:00
|
|
|
hb_set_t tags_set;
|
2020-02-05 12:31:25 +01:00
|
|
|
bool success = true;
|
|
|
|
hb_tag_t table_tags[32];
|
|
|
|
unsigned offset = 0, num_tables = ARRAY_LENGTH (table_tags);
|
2022-05-11 02:06:53 +02:00
|
|
|
hb_vector_t<char> buf;
|
|
|
|
buf.alloc (4096 - 16);
|
2022-05-25 23:49:12 +02:00
|
|
|
|
2022-06-16 00:57:16 +02:00
|
|
|
while (((void) _get_table_tags (plan, offset, &num_tables, table_tags), num_tables))
|
2020-02-05 12:31:25 +01:00
|
|
|
{
|
|
|
|
for (unsigned i = 0; i < num_tables; ++i)
|
2018-02-09 03:18:16 +01:00
|
|
|
{
|
|
|
|
hb_tag_t tag = table_tags[i];
|
2020-02-05 12:31:25 +01:00
|
|
|
if (_should_drop_table (plan, tag) && !tags_set.has (tag)) continue;
|
2019-09-01 23:11:48 +02:00
|
|
|
tags_set.add (tag);
|
2022-05-11 02:06:53 +02:00
|
|
|
success = _subset_table (plan, buf, tag);
|
2020-02-05 12:31:25 +01:00
|
|
|
if (unlikely (!success)) goto end;
|
2018-02-09 03:18:16 +01:00
|
|
|
}
|
2020-02-05 12:31:25 +01:00
|
|
|
offset += num_tables;
|
|
|
|
}
|
2018-02-08 01:09:52 +01:00
|
|
|
|
2022-05-25 23:49:12 +02:00
|
|
|
end:
|
2022-02-11 21:44:58 +01:00
|
|
|
return success ? hb_face_reference (plan->dest) : nullptr;
|
2018-01-31 23:53:09 +01:00
|
|
|
}
|