265 lines
7.6 KiB
C++
265 lines
7.6 KiB
C++
/*
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* Copyright © 2021 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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*/
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#ifndef HB_OT_VAR_COMMON_HH
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#define HB_OT_VAR_COMMON_HH
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#include "hb-ot-layout-common.hh"
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namespace OT {
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struct DeltaSetIndexMapFormat0
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{
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friend struct DeltaSetIndexMap;
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private:
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DeltaSetIndexMapFormat0* copy (hb_serialize_context_t *c) const
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{
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TRACE_SERIALIZE (this);
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auto *out = c->start_embed (this);
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if (unlikely (!out)) return_trace (nullptr);
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unsigned total_size = min_size + mapCount * get_width ();
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HBUINT8 *p = c->allocate_size<HBUINT8> (total_size);
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if (unlikely (!p)) return_trace (nullptr);
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memcpy (p, this, HBUINT8::static_size * total_size);
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return_trace (out);
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}
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template <typename T>
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bool serialize (hb_serialize_context_t *c, const T &plan)
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{
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unsigned int width = plan.get_width ();
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unsigned int inner_bit_count = plan.get_inner_bit_count ();
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const hb_array_t<const uint32_t> output_map = plan.get_output_map ();
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TRACE_SERIALIZE (this);
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if (unlikely (output_map.length && ((((inner_bit_count-1)&~0xF)!=0) || (((width-1)&~0x3)!=0))))
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return_trace (false);
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if (unlikely (!c->extend_min (this))) return_trace (false);
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entryFormat = ((width-1)<<4)|(inner_bit_count-1);
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mapCount = output_map.length;
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HBUINT8 *p = c->allocate_size<HBUINT8> (width * output_map.length);
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if (unlikely (!p)) return_trace (false);
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for (unsigned int i = 0; i < output_map.length; i++)
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{
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unsigned int v = output_map[i];
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unsigned int outer = v >> 16;
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unsigned int inner = v & 0xFFFF;
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unsigned int u = (outer << inner_bit_count) | inner;
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for (unsigned int w = width; w > 0;)
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{
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p[--w] = u;
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u >>= 8;
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}
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p += width;
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}
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return_trace (true);
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}
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uint32_t map (unsigned int v) const /* Returns 16.16 outer.inner. */
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{
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/* If count is zero, pass value unchanged. This takes
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* care of direct mapping for advance map. */
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if (!mapCount)
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return v;
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if (v >= mapCount)
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v = mapCount - 1;
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unsigned int u = 0;
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{ /* Fetch it. */
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unsigned int w = get_width ();
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const HBUINT8 *p = mapDataZ.arrayZ + w * v;
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for (; w; w--)
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u = (u << 8) + *p++;
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}
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{ /* Repack it. */
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unsigned int n = get_inner_bit_count ();
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unsigned int outer = u >> n;
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unsigned int inner = u & ((1 << n) - 1);
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u = (outer<<16) | inner;
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}
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return u;
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}
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unsigned get_map_count () const { return mapCount; }
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unsigned get_width () const { return ((entryFormat >> 4) & 3) + 1; }
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unsigned get_inner_bit_count () const { return (entryFormat & 0xF) + 1; }
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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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c->check_range (mapDataZ.arrayZ,
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mapCount,
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get_width ()));
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}
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protected:
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HBUINT8 format; /* Format identifier--format = 0 */
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HBUINT8 entryFormat; /* A packed field that describes the compressed
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* representation of delta-set indices. */
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HBUINT16 mapCount; /* The number of mapping entries. */
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UnsizedArrayOf<HBUINT8>
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mapDataZ; /* The delta-set index mapping data. */
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public:
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DEFINE_SIZE_ARRAY (4, mapDataZ);
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};
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struct DeltaSetIndexMapFormat1
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{
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friend struct DeltaSetIndexMap;
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private:
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DeltaSetIndexMapFormat1* copy (hb_serialize_context_t *c) const
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{
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TRACE_SERIALIZE (this);
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auto *out = c->start_embed (this);
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if (unlikely (!out)) return_trace (nullptr);
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unsigned total_size = min_size + mapCount * get_width ();
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HBUINT8 *p = c->allocate_size<HBUINT8> (total_size);
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if (unlikely (!p)) return_trace (nullptr);
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memcpy (p, this, HBUINT8::static_size * total_size);
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return_trace (out);
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}
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unsigned get_map_count () const { return mapCount; }
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unsigned get_width () const { return ((entryFormat >> 4) & 3) + 1; }
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unsigned get_inner_bit_count () const { return (entryFormat & 0xF) + 1; }
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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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c->check_range (mapDataZ.arrayZ,
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mapCount,
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get_width ()));
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}
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protected:
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HBUINT8 format; /* Format identifier--format = 1 */
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HBUINT8 entryFormat; /* A packed field that describes the compressed
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* representation of delta-set indices. */
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HBUINT32 mapCount; /* The number of mapping entries. */
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UnsizedArrayOf<HBUINT8>
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mapDataZ; /* The delta-set index mapping data. */
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public:
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DEFINE_SIZE_ARRAY (6, mapDataZ);
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};
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struct DeltaSetIndexMap
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{
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template <typename T>
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bool serialize (hb_serialize_context_t *c, const T &plan)
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{
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TRACE_SERIALIZE (this);
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switch (u.format) {
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case 0: return_trace (u.format0.serialize (c, plan));
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default:return_trace (false);
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}
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}
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uint32_t map (unsigned v) const
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{
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switch (u.format) {
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case 0: return (u.format0.map (v));
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default:return v;
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}
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}
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unsigned get_map_count () const
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{
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switch (u.format) {
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case 0: return u.format0.get_map_count ();
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case 1: return u.format1.get_map_count ();
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default:return 0;
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}
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}
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unsigned get_width () const
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{
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switch (u.format) {
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case 0: return u.format0.get_width ();
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case 1: return u.format1.get_width ();
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default:return 0;
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}
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}
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unsigned get_inner_bit_count () const
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{
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switch (u.format) {
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case 0: return u.format0.get_inner_bit_count ();
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case 1: return u.format1.get_inner_bit_count ();
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default:return 0;
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}
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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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if (!u.format.sanitize (c)) return_trace (false);
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switch (u.format) {
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case 0: return_trace (u.format0.sanitize (c));
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case 1: return_trace (u.format1.sanitize (c));
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default:return_trace (true);
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}
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}
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DeltaSetIndexMap* copy (hb_serialize_context_t *c) const
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{
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TRACE_SERIALIZE (this);
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switch (u.format) {
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case 0: return_trace (reinterpret_cast<DeltaSetIndexMap *> (u.format0.copy (c)));
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case 1: return_trace (reinterpret_cast<DeltaSetIndexMap *> (u.format1.copy (c)));
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default:return_trace (nullptr);
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}
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}
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protected:
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union {
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HBUINT8 format; /* Format identifier */
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DeltaSetIndexMapFormat0 format0;
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DeltaSetIndexMapFormat1 format1;
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} u;
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public:
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DEFINE_SIZE_UNION (1, format);
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};
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} /* namespace OT */
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#endif /* HB_OT_VAR_COMMON_HH */
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