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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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