| /* |
| * Copyright © 2021 Google, Inc. |
| * |
| * This is part of HarfBuzz, a text shaping library. |
| * |
| * Permission is hereby granted, without written agreement and without |
| * license or royalty fees, to use, copy, modify, and distribute this |
| * software and its documentation for any purpose, provided that the |
| * above copyright notice and the following two paragraphs appear in |
| * all copies of this software. |
| * |
| * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR |
| * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES |
| * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN |
| * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH |
| * DAMAGE. |
| * |
| * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, |
| * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND |
| * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS |
| * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO |
| * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. |
| * |
| */ |
| |
| #ifndef HB_OT_VAR_COMMON_HH |
| #define HB_OT_VAR_COMMON_HH |
| |
| #include "hb-ot-layout-common.hh" |
| |
| |
| namespace OT { |
| |
| template <typename MapCountT> |
| struct DeltaSetIndexMapFormat01 |
| { |
| friend struct DeltaSetIndexMap; |
| |
| private: |
| DeltaSetIndexMapFormat01* copy (hb_serialize_context_t *c) const |
| { |
| TRACE_SERIALIZE (this); |
| auto *out = c->start_embed (this); |
| if (unlikely (!out)) return_trace (nullptr); |
| |
| unsigned total_size = min_size + mapCount * get_width (); |
| HBUINT8 *p = c->allocate_size<HBUINT8> (total_size); |
| if (unlikely (!p)) return_trace (nullptr); |
| |
| memcpy (p, this, HBUINT8::static_size * total_size); |
| return_trace (out); |
| } |
| |
| template <typename T> |
| bool serialize (hb_serialize_context_t *c, const T &plan) |
| { |
| unsigned int width = plan.get_width (); |
| unsigned int inner_bit_count = plan.get_inner_bit_count (); |
| const hb_array_t<const uint32_t> output_map = plan.get_output_map (); |
| |
| TRACE_SERIALIZE (this); |
| if (unlikely (output_map.length && ((((inner_bit_count-1)&~0xF)!=0) || (((width-1)&~0x3)!=0)))) |
| return_trace (false); |
| if (unlikely (!c->extend_min (this))) return_trace (false); |
| |
| entryFormat = ((width-1)<<4)|(inner_bit_count-1); |
| mapCount = output_map.length; |
| HBUINT8 *p = c->allocate_size<HBUINT8> (width * output_map.length); |
| if (unlikely (!p)) return_trace (false); |
| for (unsigned int i = 0; i < output_map.length; i++) |
| { |
| unsigned int v = output_map[i]; |
| unsigned int outer = v >> 16; |
| unsigned int inner = v & 0xFFFF; |
| unsigned int u = (outer << inner_bit_count) | inner; |
| for (unsigned int w = width; w > 0;) |
| { |
| p[--w] = u; |
| u >>= 8; |
| } |
| p += width; |
| } |
| return_trace (true); |
| } |
| |
| uint32_t map (unsigned int v) const /* Returns 16.16 outer.inner. */ |
| { |
| /* If count is zero, pass value unchanged. This takes |
| * care of direct mapping for advance map. */ |
| if (!mapCount) |
| return v; |
| |
| if (v >= mapCount) |
| v = mapCount - 1; |
| |
| unsigned int u = 0; |
| { /* Fetch it. */ |
| unsigned int w = get_width (); |
| const HBUINT8 *p = mapDataZ.arrayZ + w * v; |
| for (; w; w--) |
| u = (u << 8) + *p++; |
| } |
| |
| { /* Repack it. */ |
| unsigned int n = get_inner_bit_count (); |
| unsigned int outer = u >> n; |
| unsigned int inner = u & ((1 << n) - 1); |
| u = (outer<<16) | inner; |
| } |
| |
| return u; |
| } |
| |
| unsigned get_map_count () const { return mapCount; } |
| unsigned get_width () const { return ((entryFormat >> 4) & 3) + 1; } |
| unsigned get_inner_bit_count () const { return (entryFormat & 0xF) + 1; } |
| |
| |
| bool sanitize (hb_sanitize_context_t *c) const |
| { |
| TRACE_SANITIZE (this); |
| return_trace (c->check_struct (this) && |
| c->check_range (mapDataZ.arrayZ, |
| mapCount, |
| get_width ())); |
| } |
| |
| protected: |
| HBUINT8 format; /* Format identifier--format = 0 */ |
| HBUINT8 entryFormat; /* A packed field that describes the compressed |
| * representation of delta-set indices. */ |
| MapCountT mapCount; /* The number of mapping entries. */ |
| UnsizedArrayOf<HBUINT8> |
| mapDataZ; /* The delta-set index mapping data. */ |
| |
| public: |
| DEFINE_SIZE_ARRAY (2+MapCountT::static_size, mapDataZ); |
| }; |
| |
| struct DeltaSetIndexMap |
| { |
| template <typename T> |
| bool serialize (hb_serialize_context_t *c, const T &plan) |
| { |
| TRACE_SERIALIZE (this); |
| unsigned length = plan.get_output_map ().length; |
| u.format = length <= 0xFFFF ? 0 : 1; |
| switch (u.format) { |
| case 0: return_trace (u.format0.serialize (c, plan)); |
| case 1: return_trace (u.format1.serialize (c, plan)); |
| default:return_trace (false); |
| } |
| } |
| |
| uint32_t map (unsigned v) const |
| { |
| switch (u.format) { |
| case 0: return (u.format0.map (v)); |
| case 1: return (u.format1.map (v)); |
| default:return v; |
| } |
| } |
| |
| unsigned get_map_count () const |
| { |
| switch (u.format) { |
| case 0: return u.format0.get_map_count (); |
| case 1: return u.format1.get_map_count (); |
| default:return 0; |
| } |
| } |
| |
| unsigned get_width () const |
| { |
| switch (u.format) { |
| case 0: return u.format0.get_width (); |
| case 1: return u.format1.get_width (); |
| default:return 0; |
| } |
| } |
| |
| unsigned get_inner_bit_count () const |
| { |
| switch (u.format) { |
| case 0: return u.format0.get_inner_bit_count (); |
| case 1: return u.format1.get_inner_bit_count (); |
| default:return 0; |
| } |
| } |
| |
| bool sanitize (hb_sanitize_context_t *c) const |
| { |
| TRACE_SANITIZE (this); |
| if (!u.format.sanitize (c)) return_trace (false); |
| switch (u.format) { |
| case 0: return_trace (u.format0.sanitize (c)); |
| case 1: return_trace (u.format1.sanitize (c)); |
| default:return_trace (true); |
| } |
| } |
| |
| DeltaSetIndexMap* copy (hb_serialize_context_t *c) const |
| { |
| TRACE_SERIALIZE (this); |
| switch (u.format) { |
| case 0: return_trace (reinterpret_cast<DeltaSetIndexMap *> (u.format0.copy (c))); |
| case 1: return_trace (reinterpret_cast<DeltaSetIndexMap *> (u.format1.copy (c))); |
| default:return_trace (nullptr); |
| } |
| } |
| |
| protected: |
| union { |
| HBUINT8 format; /* Format identifier */ |
| DeltaSetIndexMapFormat01<HBUINT16> format0; |
| DeltaSetIndexMapFormat01<HBUINT32> format1; |
| } u; |
| public: |
| DEFINE_SIZE_UNION (1, format); |
| }; |
| |
| } /* namespace OT */ |
| |
| |
| #endif /* HB_OT_VAR_COMMON_HH */ |