Added hb-ot-var-gvar-table.hh
implemented sanitize() placeholder subset() some code cleanup
This commit is contained in:
Michiharu Ariza
parent
9168b32a1b
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9690461a91
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/*
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* Copyright © 2018 Adobe Inc.
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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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* Adobe Author(s): Michiharu Ariza
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*/
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#ifndef HB_OT_GVAR_TABLE_HH
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#define HB_OT_GVAR_TABLE_HH
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#include "hb-open-type.hh"
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/*
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* gvar -- Glyph Variation Table
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* https://docs.microsoft.com/en-us/typography/opentype/spec/gvar
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*/
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#define HB_OT_TAG_gvar HB_TAG('g','v','a','r')
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namespace OT {
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struct Tupple
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{
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bool sanitize (hb_sanitize_context_t *c, unsigned int axis_count) const
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{
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TRACE_SANITIZE (this);
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return_trace (coords.sanitize (c, axis_count, this));s
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}
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protected:
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UnsizedArrayOf<F2DOT14>
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coords;
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public:
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DEFINE_SIZE_ARRAY (0, coords);
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};
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struct TupleVarHeader
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{
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HBUINT16 varDataSize;
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HBUINT16 tupleIndex;
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/* Tuple peakTuple */
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/* Tuple intermediateStartTuple */
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/* Tuple intermediateEndTuple */
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};
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struct GlyphVarData
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{
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HBUINT16 tupleVarCount;
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OffsetTo<HBUINT8>
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data;
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UnsizedArrayOf<TupleVarHeader>
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tupleVarHeaders;
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};
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struct gvar
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{
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static constexpr hb_tag_t tableTag = HB_OT_TAG_gvar;
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bool has_data () const { return version.to_int (); }
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int get_y_origin (hb_codepoint_t glyph) const
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{
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unsigned int i;
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if (!vertYOrigins.bfind (glyph, &i))
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return defaultVertOriginY;
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return vertYOrigins[i].vertOriginY;
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}
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bool _subset (const hb_subset_plan_t *plan HB_UNUSED,
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const gvar *vorg_table,
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const hb_vector_t<VertOriginMetric> &subset_metrics,
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unsigned int dest_sz,
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void *dest) const
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{
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hb_serialize_context_t c (dest, dest_sz);
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gvar *subset_table = c.start_serialize<gvar> ();
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if (unlikely (!c.extend_min (*subset_table)))
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return false;
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subset_table->version.major.set (1);
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subset_table->version.minor.set (0);
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subset_table->defaultVertOriginY.set (vorg_table->defaultVertOriginY);
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subset_table->vertYOrigins.len.set (subset_metrics.length);
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bool success = true;
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if (subset_metrics.length > 0)
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{
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unsigned int size = VertOriginMetric::static_size * subset_metrics.length;
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VertOriginMetric *metrics = c.allocate_size<VertOriginMetric> (size);
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if (likely (metrics != nullptr))
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memcpy (metrics, &subset_metrics[0], size);
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else
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success = false;
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}
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c.end_serialize ();
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return success;
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}
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bool subset (hb_subset_plan_t *plan) const
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{
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hb_blob_t *vorg_blob = hb_sanitize_context_t().reference_table<gvar> (plan->source);
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const gvar *vorg_table = vorg_blob->as<gvar> ();
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/* count the number of glyphs to be included in the subset table */
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hb_vector_t<VertOriginMetric> subset_metrics;
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subset_metrics.init ();
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hb_codepoint_t old_glyph = HB_SET_VALUE_INVALID;
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unsigned int i = 0;
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while (i < vertYOrigins.len
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&& plan->glyphset ()->next (&old_glyph))
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{
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while (old_glyph > vertYOrigins[i].glyph)
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{
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i++;
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if (i >= vertYOrigins.len)
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break;
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}
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if (old_glyph == vertYOrigins[i].glyph)
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{
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hb_codepoint_t new_glyph;
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if (plan->new_gid_for_old_gid (old_glyph, &new_glyph))
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{
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VertOriginMetric *metrics = subset_metrics.push ();
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metrics->glyph.set (new_glyph);
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metrics->vertOriginY.set (vertYOrigins[i].vertOriginY);
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}
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}
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}
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/* alloc the new table */
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unsigned int dest_sz = gvar::min_size + VertOriginMetric::static_size * subset_metrics.length;
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void *dest = (void *) malloc (dest_sz);
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if (unlikely (!dest))
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{
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subset_metrics.fini ();
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hb_blob_destroy (vorg_blob);
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return false;
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}
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/* serialize the new table */
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if (!_subset (plan, vorg_table, subset_metrics, dest_sz, dest))
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{
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subset_metrics.fini ();
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free (dest);
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hb_blob_destroy (vorg_blob);
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return false;
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}
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hb_blob_t *result = hb_blob_create ((const char *)dest,
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dest_sz,
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HB_MEMORY_MODE_READONLY,
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dest,
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free);
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bool success = plan->add_table (HB_OT_TAG_gvar, result);
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hb_blob_destroy (result);
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subset_metrics.fini ();
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hb_blob_destroy (vorg_blob);
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return success;
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}
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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 (c->check_struct (this) &&
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version.major == 1 &&
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glyphVarDataArray.sanitize (c));
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}
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protected:
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FixedVersion<> version; /* Version of gvar table. Set to 0x00010000u. */
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HBUINT16 axisCount;
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HBUINT16 sharedTupleCount;
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LOffsetTo<Tupple> sharedTuples;
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HBUINT16 glyphCount;
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HBUINT16 flags;
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LOffsetTo<GlyphVarData>
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glyphVarDataArray;
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/* OffsetTo<GlyphVariationData> glyphVariationDataOffsets */
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public:
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DEFINE_SIZE_ARRAY(8, vertYOrigins);
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};
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} /* namespace OT */
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#endif /* HB_OT_GVAR_TABLE_HH */
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@ -173,7 +173,7 @@ struct GlyphVarData
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current_tuple = &var_data->get_tuple_var_header ();
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data_offset = 0;
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}
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bool is_valid () const
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{
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return (index < var_data->tupleVarCount.get_count ()) &&
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@ -223,7 +223,7 @@ struct GlyphVarData
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TupleVarCount tupleVarCount;
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OffsetTo<HBUINT8> data;
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/* TupleVarHeader tupleVarHeaders[] */
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public:
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DEFINE_SIZE_MIN (4);
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};
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@ -292,7 +292,7 @@ struct gvar
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((HBUINT32 *)subset_offsets)[gid].set (glyph_offset);
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else
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((HBUINT16 *)subset_offsets)[gid].set (glyph_offset / 2);
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if (length > 0) memcpy (subset_data, get_glyph_var_data (old_gid), length);
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subset_data += length;
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glyph_offset += length;
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@ -380,7 +380,7 @@ struct gvar
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protected:
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typedef glyf::accelerator_t glyf_acc_t;
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static float infer_delta (float target_val, float pre_val, float fol_val,
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float pre_delta, float fol_delta)
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{
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@ -395,7 +395,7 @@ struct gvar
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float r = (target_val - pre_val) / (fol_val - pre_val);
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return (1.f - r) * pre_delta + r * fol_delta;
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}
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bool apply_deltas_to_points (hb_codepoint_t glyph,
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const int *coords, unsigned int coord_count,
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const hb_array_t<contour_point_t> points,
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@ -572,7 +572,7 @@ struct gvar
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{
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float advance = 0.f;
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if (coord_count != gvar_table->axisCount) return advance;
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hb_vector_t<contour_point_t> points;
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points.resize (glyf_acc_t::PHANTOM_COUNT);
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