[STAT] Add table parsing (#1384)
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Ebrahim Byagowi
GitHub
parent
48d16c2ab2
commit
7867c2bad0
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@ -158,6 +158,7 @@ HB_OT_sources = \
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hb-ot-shape-fallback.hh \
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hb-ot-shape-fallback.cc \
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hb-ot-shape.hh \
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hb-ot-stat-table.hh \
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hb-ot-var.cc \
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hb-ot-var-avar-table.hh \
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hb-ot-var-fvar-table.hh \
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@ -49,6 +49,8 @@
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HB_OT_ACCELERATOR(OT, glyf) \
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HB_OT_TABLE(OT, VORG) \
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HB_OT_ACCELERATOR(OT, name) \
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HB_OT_TABLE(OT, OS2) \
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HB_OT_TABLE(OT, STAT) \
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/* OpenType shaping. */ \
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HB_OT_ACCELERATOR(OT, GDEF) \
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HB_OT_ACCELERATOR(OT, GSUB) \
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@ -33,10 +33,12 @@
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#include "hb-ot-face.hh"
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#include "hb-ot-cmap-table.hh"
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#include "hb-ot-glyf-table.hh"
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#include "hb-ot-hmtx-table.hh"
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#include "hb-ot-kern-table.hh"
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#include "hb-ot-os2-table.hh"
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#include "hb-ot-post-table.hh"
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#include "hb-ot-glyf-table.hh"
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#include "hb-ot-stat-table.hh" // Just so we compile it; unused otherwise.
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#include "hb-ot-vorg-table.hh"
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#include "hb-ot-color-cbdt-table.hh"
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#include "hb-ot-color-sbix-table.hh"
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@ -194,17 +194,14 @@ struct hmtxvmtx
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bool got_font_extents = false;
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if (T::os2Tag)
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{
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hb_blob_t *os2_blob = hb_sanitize_context_t().reference_table<OS2> (face);
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const OS2 *os2_table = os2_blob->as<OS2> ();
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#define USE_TYPO_METRICS (1u<<7)
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if (0 != (os2_table->fsSelection & USE_TYPO_METRICS))
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if (0 != (face->table.OS2->fsSelection & USE_TYPO_METRICS))
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{
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ascender = abs (os2_table->sTypoAscender);
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descender = -abs (os2_table->sTypoDescender);
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line_gap = os2_table->sTypoLineGap;
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ascender = abs (face->table.OS2->sTypoAscender);
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descender = -abs (face->table.OS2->sTypoDescender);
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line_gap = face->table.OS2->sTypoLineGap;
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got_font_extents = (ascender | descender) != 0;
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}
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hb_blob_destroy (os2_blob);
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}
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hb_blob_t *_hea_blob = hb_sanitize_context_t().reference_table<H> (face);
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@ -0,0 +1,280 @@
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/*
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* Copyright © 2018 Ebrahim Byagowi
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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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#ifndef HB_OT_STAT_TABLE_HH
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#define HB_OT_STAT_TABLE_HH
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#include "hb-open-type.hh"
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#include "hb-ot-layout-common.hh"
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/*
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* STAT -- Style Attributes
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* https://docs.microsoft.com/en-us/typography/opentype/spec/stat
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*/
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#define HB_OT_TAG_STAT HB_TAG('S','T','A','T')
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namespace OT {
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enum
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{
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OLDER_SIBLING_FONT_ATTRIBUTE = 0x0001, /* If set, this axis value table
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* provides axis value information
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* that is applicable to other fonts
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* within the same font family. This
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* is used if the other fonts were
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* released earlier and did not include
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* information about values for some axis.
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* If newer versions of the other
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* fonts include the information
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* themselves and are present,
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* then this record is ignored. */
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ELIDABLE_AXIS_VALUE_NAME = 0x0002 /* If set, it indicates that the axis
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* value represents the “normal” value
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* for the axis and may be omitted when
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* composing name strings. */
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// Reserved = 0xFFFC /* Reserved for future use — set to zero. */
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};
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struct StatAxisRecord
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{
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inline bool sanitize (hb_sanitize_context_t *c) const
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{
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TRACE_SANITIZE (this);
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return_trace (likely (c->check_struct (this)));
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}
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protected:
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Tag axisTag; /* A tag identifying the axis of design variation. */
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NameID axisNameID; /* The name ID for entries in the 'name' table that
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* provide a display string for this axis. */
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HBUINT16 axisOrdering; /* A value that applications can use to determine
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* primary sorting of face names, or for ordering
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* of descriptors when composing family or face names. */
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public:
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DEFINE_SIZE_STATIC (8);
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};
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struct AxisValueFormat1
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{
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inline bool sanitize (hb_sanitize_context_t *c) const
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{
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TRACE_SANITIZE (this);
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return_trace (likely (c->check_struct (this)));
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}
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protected:
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HBUINT16 format; /* Format identifier — set to 1. */
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HBUINT16 axisIndex; /* Zero-base index into the axis record array
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* identifying the axis of design variation
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* to which the axis value record applies.
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* Must be less than designAxisCount. */
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HBUINT16 flags; /* Flags — see below for details. */
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NameID valueNameID; /* The name ID for entries in the 'name' table
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* that provide a display string for this
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* attribute value. */
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Fixed value; /* A numeric value for this attribute value. */
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public:
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DEFINE_SIZE_STATIC (12);
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};
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struct AxisValueFormat2
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{
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inline bool sanitize (hb_sanitize_context_t *c) const
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{
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TRACE_SANITIZE (this);
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return_trace (likely (c->check_struct (this)));
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}
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protected:
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HBUINT16 format; /* Format identifier — set to 2. */
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HBUINT16 axisIndex; /* Zero-base index into the axis record array
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* identifying the axis of design variation
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* to which the axis value record applies.
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* Must be less than designAxisCount. */
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HBUINT16 flags; /* Flags — see below for details. */
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NameID valueNameID; /* The name ID for entries in the 'name' table
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* that provide a display string for this
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* attribute value. */
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Fixed nominalValue; /* A numeric value for this attribute value. */
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Fixed rangeMinValue; /* The minimum value for a range associated
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* with the specified name ID. */
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Fixed rangeMaxValue; /* The maximum value for a range associated
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* with the specified name ID. */
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public:
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DEFINE_SIZE_STATIC (20);
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};
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struct AxisValueFormat3
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{
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inline bool sanitize (hb_sanitize_context_t *c) const
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{
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TRACE_SANITIZE (this);
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return_trace (likely (c->check_struct (this)));
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}
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protected:
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HBUINT16 format; /* Format identifier — set to 3. */
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HBUINT16 axisIndex; /* Zero-base index into the axis record array
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* identifying the axis of design variation
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* to which the axis value record applies.
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* Must be less than designAxisCount. */
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HBUINT16 flags; /* Flags — see below for details. */
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NameID valueNameID; /* The name ID for entries in the 'name' table
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* that provide a display string for this
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* attribute value. */
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Fixed value; /* A numeric value for this attribute value. */
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Fixed linkedValue; /* The numeric value for a style-linked mapping
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* from this value. */
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public:
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DEFINE_SIZE_STATIC (16);
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};
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struct AxisValueRecord
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{
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inline bool sanitize (hb_sanitize_context_t *c) const
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{
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TRACE_SANITIZE (this);
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return_trace (likely (c->check_struct (this)));
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}
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protected:
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HBUINT16 axisIndex; /* Zero-base index into the axis record array
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* identifying the axis to which this value
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* applies. Must be less than designAxisCount. */
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Fixed value; /* A numeric value for this attribute value. */
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public:
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DEFINE_SIZE_STATIC (6);
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};
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struct AxisValueFormat4
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{
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inline bool sanitize (hb_sanitize_context_t *c) const
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{
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TRACE_SANITIZE (this);
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return_trace (likely (c->check_struct (this)));
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}
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protected:
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HBUINT16 format; /* Format identifier — set to 4. */
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HBUINT16 axisCount; /* The total number of axes contributing to
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* this axis-values combination. */
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HBUINT16 flags; /* Flags — see below for details. */
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NameID valueNameID; /* The name ID for entries in the 'name' table
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* that provide a display string for this
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* attribute value. */
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UnsizedArrayOf<AxisValueRecord>
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axisValues; /* Array of AxisValue records that provide the
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* combination of axis values, one for each
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* contributing axis. */
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public:
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DEFINE_SIZE_ARRAY (8, axisValues);
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};
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struct AxisValue
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{
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inline bool sanitize (hb_sanitize_context_t *c) const
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{
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TRACE_SANITIZE (this);
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if (unlikely (c->check_struct (this)))
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return_trace (false);
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switch (u.format)
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{
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case 1: return_trace (likely (u.format1.sanitize (c)));
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case 2: return_trace (likely (u.format2.sanitize (c)));
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case 3: return_trace (likely (u.format3.sanitize (c)));
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case 4: return_trace (likely (u.format4.sanitize (c)));
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default: return_trace (true);
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}
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}
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protected:
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union
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{
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HBUINT16 format;
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AxisValueFormat1 format1;
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AxisValueFormat2 format2;
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AxisValueFormat3 format3;
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AxisValueFormat4 format4;
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} u;
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public:
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DEFINE_SIZE_UNION (2, format);
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};
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struct STAT
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{
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static const hb_tag_t tableTag = HB_OT_TAG_STAT;
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inline bool sanitize (hb_sanitize_context_t *c) const
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{
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TRACE_SANITIZE (this);
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return_trace (likely (c->check_struct (this) &&
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majorVersion == 1 &&
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minorVersion > 0 &&
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designAxesOffset.sanitize (c, this, designAxisCount) &&
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offsetToAxisValueOffsets.sanitize (c, this, axisValueCount, &(this+offsetToAxisValueOffsets))));
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}
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protected:
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HBUINT16 majorVersion; /* Major version number of the style attributes
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* table — set to 1. */
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HBUINT16 minorVersion; /* Minor version number of the style attributes
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* table — set to 2. */
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HBUINT16 designAxisSize; /* The size in bytes of each axis record. */
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HBUINT16 designAxisCount;/* The number of design axis records. In a
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* font with an 'fvar' table, this value must be
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* greater than or equal to the axisCount value
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* in the 'fvar' table. In all fonts, must
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* be greater than zero if axisValueCount
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* is greater than zero. */
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LOffsetTo<UnsizedArrayOf<StatAxisRecord>, false>
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designAxesOffset;
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/* Offset in bytes from the beginning of
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* the STAT table to the start of the design
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* axes array. If designAxisCount is zero,
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* set to zero; if designAxisCount is greater
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* than zero, must be greater than zero. */
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HBUINT16 axisValueCount; /* The number of axis value tables. */
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LOffsetTo<UnsizedArrayOf<OffsetTo<AxisValue> >, false>
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offsetToAxisValueOffsets;
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/* Offset in bytes from the beginning of
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* the STAT table to the start of the design
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* axes value offsets array. If axisValueCount
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* is zero, set to zero; if axisValueCount is
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* greater than zero, must be greater than zero. */
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NameID elidedFallbackNameID;
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/* Name ID used as fallback when projection of
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* names into a particular font model produces
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* a subfamily name containing only elidable
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* elements. */
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public:
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DEFINE_SIZE_STATIC (20);
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};
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} /* namespace OT */
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#endif /* HB_OT_STAT_TABLE_HH */
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