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[Complex Text Layouts] Add third-party TextServer dependencies (ICU, HarfBuzz, Graphite).
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bruvzg
278
thirdparty/harfbuzz/src/hb-ot-color-colr-table.hh
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278
thirdparty/harfbuzz/src/hb-ot-color-colr-table.hh
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/*
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* Copyright © 2018 Ebrahim Byagowi
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* Copyright © 2020 Google, 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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* Google Author(s): Calder Kitagawa
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*/
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#ifndef HB_OT_COLOR_COLR_TABLE_HH
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#define HB_OT_COLOR_COLR_TABLE_HH
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#include "hb-open-type.hh"
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/*
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* COLR -- Color
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* https://docs.microsoft.com/en-us/typography/opentype/spec/colr
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*/
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#define HB_OT_TAG_COLR HB_TAG('C','O','L','R')
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namespace OT {
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struct LayerRecord
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{
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operator hb_ot_color_layer_t () const { return {glyphId, colorIdx}; }
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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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}
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public:
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HBGlyphID glyphId; /* Glyph ID of layer glyph */
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Index colorIdx; /* Index value to use with a
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* selected color palette.
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* An index value of 0xFFFF
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* is a special case indicating
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* that the text foreground
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* color (defined by a
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* higher-level client) should
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* be used and shall not be
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* treated as actual index
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* into CPAL ColorRecord array. */
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public:
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DEFINE_SIZE_STATIC (4);
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};
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struct BaseGlyphRecord
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{
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int cmp (hb_codepoint_t g) const
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{ return g < glyphId ? -1 : g > glyphId ? 1 : 0; }
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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 (likely (c->check_struct (this)));
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}
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public:
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HBGlyphID glyphId; /* Glyph ID of reference glyph */
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HBUINT16 firstLayerIdx; /* Index (from beginning of
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* the Layer Records) to the
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* layer record. There will be
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* numLayers consecutive entries
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* for this base glyph. */
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HBUINT16 numLayers; /* Number of color layers
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* associated with this glyph */
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public:
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DEFINE_SIZE_STATIC (6);
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};
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struct COLR
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{
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static constexpr hb_tag_t tableTag = HB_OT_TAG_COLR;
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bool has_data () const { return numBaseGlyphs; }
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unsigned int get_glyph_layers (hb_codepoint_t glyph,
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unsigned int start_offset,
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unsigned int *count, /* IN/OUT. May be NULL. */
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hb_ot_color_layer_t *layers /* OUT. May be NULL. */) const
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{
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const BaseGlyphRecord &record = (this+baseGlyphsZ).bsearch (numBaseGlyphs, glyph);
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hb_array_t<const LayerRecord> all_layers = (this+layersZ).as_array (numLayers);
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hb_array_t<const LayerRecord> glyph_layers = all_layers.sub_array (record.firstLayerIdx,
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record.numLayers);
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if (count)
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{
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+ glyph_layers.sub_array (start_offset, count)
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| hb_sink (hb_array (layers, *count))
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;
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}
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return glyph_layers.length;
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}
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struct accelerator_t
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{
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accelerator_t () {}
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~accelerator_t () { fini (); }
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void init (hb_face_t *face)
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{ colr = hb_sanitize_context_t ().reference_table<COLR> (face); }
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void fini () { this->colr.destroy (); }
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bool is_valid () { return colr.get_blob ()->length; }
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void closure_glyphs (hb_codepoint_t glyph,
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hb_set_t *related_ids /* OUT */) const
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{ colr->closure_glyphs (glyph, related_ids); }
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private:
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hb_blob_ptr_t<COLR> colr;
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};
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void closure_glyphs (hb_codepoint_t glyph,
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hb_set_t *related_ids /* OUT */) const
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{
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const BaseGlyphRecord *record = get_base_glyph_record (glyph);
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if (!record) return;
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auto glyph_layers = (this+layersZ).as_array (numLayers).sub_array (record->firstLayerIdx,
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record->numLayers);
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if (!glyph_layers.length) return;
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related_ids->add_array (&glyph_layers[0].glyphId, glyph_layers.length, LayerRecord::min_size);
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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 (likely (c->check_struct (this) &&
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(this+baseGlyphsZ).sanitize (c, numBaseGlyphs) &&
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(this+layersZ).sanitize (c, numLayers)));
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}
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template<typename BaseIterator, typename LayerIterator,
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hb_requires (hb_is_iterator (BaseIterator)),
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hb_requires (hb_is_iterator (LayerIterator))>
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bool serialize (hb_serialize_context_t *c,
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unsigned version,
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BaseIterator base_it,
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LayerIterator layer_it)
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{
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TRACE_SERIALIZE (this);
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if (unlikely (base_it.len () != layer_it.len ()))
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return_trace (false);
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if (unlikely (!c->extend_min (this))) return_trace (false);
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this->version = version;
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numLayers = 0;
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numBaseGlyphs = base_it.len ();
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baseGlyphsZ = COLR::min_size;
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layersZ = COLR::min_size + numBaseGlyphs * BaseGlyphRecord::min_size;
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for (const hb_item_type<BaseIterator> _ : + base_it.iter ())
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{
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auto* record = c->embed (_);
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if (unlikely (!record)) return_trace (false);
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record->firstLayerIdx = numLayers;
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numLayers += record->numLayers;
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}
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for (const hb_item_type<LayerIterator>& _ : + layer_it.iter ())
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_.as_array ().copy (c);
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return_trace (true);
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}
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const BaseGlyphRecord* get_base_glyph_record (hb_codepoint_t gid) const
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{
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if ((unsigned int) gid == 0) // Ignore notdef.
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return nullptr;
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const BaseGlyphRecord* record = &(this+baseGlyphsZ).bsearch (numBaseGlyphs, (unsigned int) gid);
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if ((record && (hb_codepoint_t) record->glyphId != gid))
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record = nullptr;
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return record;
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}
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bool subset (hb_subset_context_t *c) const
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{
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TRACE_SUBSET (this);
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const hb_map_t &reverse_glyph_map = *c->plan->reverse_glyph_map;
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auto base_it =
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+ hb_range (c->plan->num_output_glyphs ())
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| hb_map_retains_sorting ([&](hb_codepoint_t new_gid)
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{
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hb_codepoint_t old_gid = reverse_glyph_map.get (new_gid);
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const BaseGlyphRecord* old_record = get_base_glyph_record (old_gid);
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if (unlikely (!old_record))
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return hb_pair_t<bool, BaseGlyphRecord> (false, Null (BaseGlyphRecord));
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BaseGlyphRecord new_record;
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new_record.glyphId = new_gid;
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new_record.numLayers = old_record->numLayers;
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return hb_pair_t<bool, BaseGlyphRecord> (true, new_record);
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})
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| hb_filter (hb_first)
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| hb_map_retains_sorting (hb_second)
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;
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auto layer_it =
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+ hb_range (c->plan->num_output_glyphs ())
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| hb_map (reverse_glyph_map)
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| hb_map_retains_sorting ([&](hb_codepoint_t old_gid)
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{
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const BaseGlyphRecord* old_record = get_base_glyph_record (old_gid);
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hb_vector_t<LayerRecord> out_layers;
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if (unlikely (!old_record ||
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old_record->firstLayerIdx >= numLayers ||
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old_record->firstLayerIdx + old_record->numLayers > numLayers))
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return hb_pair_t<bool, hb_vector_t<LayerRecord>> (false, out_layers);
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auto layers = (this+layersZ).as_array (numLayers).sub_array (old_record->firstLayerIdx,
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old_record->numLayers);
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out_layers.resize (layers.length);
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for (unsigned int i = 0; i < layers.length; i++) {
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out_layers[i] = layers[i];
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hb_codepoint_t new_gid = 0;
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if (unlikely (!c->plan->new_gid_for_old_gid (out_layers[i].glyphId, &new_gid)))
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return hb_pair_t<bool, hb_vector_t<LayerRecord>> (false, out_layers);
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out_layers[i].glyphId = new_gid;
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}
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return hb_pair_t<bool, hb_vector_t<LayerRecord>> (true, out_layers);
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})
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| hb_filter (hb_first)
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| hb_map_retains_sorting (hb_second)
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;
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if (unlikely (!base_it || !layer_it || base_it.len () != layer_it.len ()))
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return_trace (false);
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COLR *colr_prime = c->serializer->start_embed<COLR> ();
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return_trace (colr_prime->serialize (c->serializer, version, base_it, layer_it));
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}
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protected:
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HBUINT16 version; /* Table version number (starts at 0). */
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HBUINT16 numBaseGlyphs; /* Number of Base Glyph Records. */
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LNNOffsetTo<SortedUnsizedArrayOf<BaseGlyphRecord>>
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baseGlyphsZ; /* Offset to Base Glyph records. */
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LNNOffsetTo<UnsizedArrayOf<LayerRecord>>
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layersZ; /* Offset to Layer Records. */
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HBUINT16 numLayers; /* Number of Layer Records. */
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public:
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DEFINE_SIZE_STATIC (14);
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};
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} /* namespace OT */
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#endif /* HB_OT_COLOR_COLR_TABLE_HH */
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