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Implement meta table parsing

This commit is contained in:
Ebrahim Byagowi 2019-07-22 18:46:52 +04:30 committed by GitHub
parent a51aa951b5
commit 41ab56e095
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GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 99 additions and 7 deletions
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1
src/Makefile.sources
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@ -88,6 +88,7 @@ HB_BASE_sources = \
hb-ot-math-table.hh \
hb-ot-math.cc \
hb-ot-maxp-table.hh \
hb-ot-meta-table.hh \
hb-ot-metrics.cc \
hb-ot-metrics.hh \
hb-ot-name-language-static.hh \

1
src/hb-ot-face-table-list.hh
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@ -62,6 +62,7 @@ HB_OT_ACCELERATOR (OT, name)
#ifndef HB_NO_STAT
HB_OT_TABLE (OT, STAT)
#endif
HB_OT_TABLE (OT, meta)
/* Vertical layout. */
HB_OT_TABLE (OT, vhea)

15
src/hb-ot-layout.cc
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@ -48,6 +48,7 @@
#include "hb-ot-layout-gpos-table.hh"
#include "hb-ot-layout-base-table.hh" // Just so we compile it; unused otherwise.
#include "hb-ot-layout-jstf-table.hh" // Just so we compile it; unused otherwise.
#include "hb-ot-meta-table.hh" // Just so we compile it; unused otherwise.
#include "hb-ot-name-table.hh"
#include "hb-ot-os2-table.hh"
@ -108,7 +109,7 @@ hb_ot_layout_has_machine_kerning (hb_face_t *face)
*
* Tests whether a face has any cross-stream kerning (i.e., kerns
* that make adjustments perpendicular to the direction of the text
* flow: Y adjustments in horizontal text or X adjustments in
* flow: Y adjustments in horizontal text or X adjustments in
* vertical text) in the 'kern' table.
*
* Does NOT examine the GPOS table.
@ -285,7 +286,7 @@ hb_ot_layout_has_glyph_classes (hb_face_t *face)
*
* Fetches the GDEF class of the requested glyph in the specified face.
*
* Return value: The #hb_ot_layout_glyph_class_t glyph class of the given code
* Return value: The #hb_ot_layout_glyph_class_t glyph class of the given code
* point in the GDEF table of the face.
*
* Since: 0.9.7
@ -329,7 +330,7 @@ hb_ot_layout_get_glyphs_in_class (hb_face_t *face,
* @point_array: (out) (array length=point_count): The array of attachment points found for the query
*
* Fetches a list of all attachment points for the specified glyph in the GDEF
* table of the face. The list returned will begin at the offset provided.
* table of the face. The list returned will begin at the offset provided.
*
* Useful if the client program wishes to cache the list.
*
@ -979,7 +980,7 @@ hb_ot_layout_feature_get_lookups (hb_face_t *face,
* @face: #hb_face_t to work upon
* @table_tag: HB_OT_TAG_GSUB or HB_OT_TAG_GPOS
*
* Fetches the total number of lookups enumerated in the specified
* Fetches the total number of lookups enumerated in the specified
* face's GSUB table or GPOS table.
*
* Since: 0.9.22
@ -1187,7 +1188,7 @@ hb_ot_layout_collect_features (hb_face_t *face,
* table or GPOS table, underneath the specified scripts, languages, and
* features. If no list of scripts is provided, all scripts will be queried.
* If no list of languages is provided, all languages will be queried. If no
* list of features is provided, all features will be queried.
* list of features is provided, all features will be queried.
*
* Since: 0.9.8
**/
@ -1581,7 +1582,7 @@ hb_ot_layout_position_finish_offsets (hb_font_t *font, hb_buffer_t *buffer)
* as used here are defined as pertaining only to fonts within a font family that differ
* specifically in their respective size ranges; other ways to differentiate fonts within
* a subfamily are not covered by the `size` feature.
*
*
* For more information on this distinction, see the `size` documentation at
* https://docs.microsoft.com/en-us/typography/opentype/spec/features_pt#tag-39size39
*
@ -1723,7 +1724,7 @@ hb_ot_layout_feature_get_name_ids (hb_face_t *face,
* returned. This function can be called with incrementally larger start_offset
* until the char_count output value is lower than its input value, or the size
* of the characters array can be increased.</note>
*
*
* Return value: Number of total sample characters in the cvXX feature.
*
* Since: 2.0.0

89
src/hb-ot-meta-table.hh Normal file
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@ -0,0 +1,89 @@
/*
* Copyright © 2019 Ebrahim Byagowi
*
* 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.
*/
#ifndef HB_OT_META_TABLE_HH
#define HB_OT_META_TABLE_HH
#include "hb-open-type.hh"
/*
* meta -- Metadata Table
* https://docs.microsoft.com/en-us/typography/opentype/spec/meta
* https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6meta.html
*/
#define HB_OT_TAG_meta HB_TAG('m','e','t','a')
namespace OT {
struct DataMap
{
bool sanitize (hb_sanitize_context_t *c, const void *base) const
{
TRACE_SANITIZE (this);
return_trace (likely (c->check_struct (this) &&
dataZ.sanitize (c, base, dataLength)));
}
protected:
Tag tag; /* A tag indicating the type of metadata. */
LOffsetTo<UnsizedArrayOf<HBUINT8>>
dataZ; /* Offset in bytes from the beginning of the
* metadata table to the data for this tag. */
HBUINT32 dataLength; /* Length of the data. The data is not required to
* be padded to any byte boundary. */
public:
DEFINE_SIZE_STATIC (12);
};
struct meta
{
static constexpr hb_tag_t tableTag = HB_OT_TAG_meta;
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (likely (c->check_struct (this) &&
version == 1 &&
dataMaps.sanitize (c, this)));
}
protected:
HBUINT32 version; /* Version number of the metadata table — set to 1. */
HBUINT32 flags; /* Flags — currently unused; set to 0. */
HBUINT32 dataOffset; /* Per Apple specification:
* Offset from the beginning of the table to the data.
* Per OT specification:
* Reserved. Not used; should be set to 0. */
LArrayOf<DataMap>
dataMaps; /* Array of data map records. */
public:
DEFINE_SIZE_ARRAY (16, dataMaps);
};
} /* namespace OT */
#endif /* HB_OT_META_TABLE_HH */